Publications | Ken-ichi Sato's website

Journal

Yojiro Mori, Eiji Honda, Ryuta Shiraki, Keijiro Suzuki, Hiroyuki Matsuura, Hitoshi Kawashima, Shu Namiki, Kazuhiro Ikeda, and Ken-ichi Sato, “Wavelength-Division Demultiplexing Enhanced by Silicon-Photonic Tunable Filters in Ultra- Wideband Optical-Path Networks,” IEEE/OSA Journal of Lightwave Technology, Vol. 38, No. 5, March 1, 2020, pp. 1002-1009.
Keisuke Kayano, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Shoichiro Oda, Setsuo Yoshida, and Takeshi Hoshida, “Transmission-Quality-Aware Online Network Design and Provisioning Enabled by Optical Performance Monitoring,” IEICE Transactions on Communications, vol. E103-B, No. 6, June 2020.
Yusaku Ito, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Architecture and Design of Coarse/Fine Hybrid Granular Routing Optical Networks,” IEICE Trans. Commun., Vol.E103-B, No. 2, February 2020, pp. 118-129.
Mungun-Erdene Ganbold, Takuma Yasuda, Yojiro Mori, Hiroshi Hasegawa, Fumikazu Inuzuka, Akira Hirano, and Ken-ichi Sato, “Assessment of optical node architectures for building next generation large bandwidth networks,” to appear in IEICE Trans. Commun.
Ryota Hashimoto, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Design of seamlessly and limitlessly expandable OXC and verification tests on its versatile applicability,” IEEE/OSA J. Optical Communications and Networking, Volume 12, Issue 5, May 2020 pp. 99-108.
Shuhei Yamakami, Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Fumikazu Inuzuka, and Akira Hirano, “Assessment of node-and link-level blocking and creating cost-effective networks in the era of large bandwidth services,” The IEICE Transactions on Communications, Vol.E102-B, No.3, pp. 510-521, Mar. 2019.
Y. Mori, Mungun-Erdene Ganbold and K. Sato, “Design and Evaluation of Optical Circuit Switches for Intra-Datacenter Networking,” IEEE/OSA J. Lightwave Technologies, Volume 37, Issue 2, January 2019, pp. 330-337. DOI: 10.1109/JLT.2019.2891209
Keisuke Kayano, Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Highly Dense Elastic Optical Networks Enabled by Grouped Routing with Distance-Adaptive Modulation,” IEEE Photonics Technology Letters, Volume, 31, Issue 4, Feb.15, 2019, pp. 295-298.
Keisuke Kayano, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Shoichiro Oda, Setsuo Yoshida, and Takeshi Hoshida, “Effectiveness of Transmission-Quality-Aware Online Network Design and Provisioning Enabled through Optical Performance Monitoring,” IEICE Communications Express (ComEX), Vol.8, No.4, January 21, 2019, pp. 81?86.
Hitoshi Takeshita, Keiichi Matsumoto, Hiroshi Hasegawa, Ken-Ichi Sato, and Emmanuel Le Taillandier De Gabory, “Improved Optical Amplification Efficiency by using Turbo Cladding Pumping Scheme for Multicore Fiber Optical Networks,”. IEICE Transactions, Vol. E102-B, No. 8, pp. 1579-1589, August 2019.
Ryuta Shiraki, Hiroshi Hasegawa, Ken-Ichi Sato, “Design and evaluation of quasi-Nyquist WDM networks utilizing widely deployed wavelength-selective switches,” Optics Express, vol. 27, no. 13, 24 Jun 2019, pp. 18549-18560.
Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Digital post-processing against inline spectrum narrowing caused by optical node traversals,” IEICE Communications Express, vol.8, No.4, January 2019, pp. 93-98.
Hitoshi Takeshita, Takefumi Oguma, Shinsuke Fujisawa, Yuta Suzuki, Baku Yatabe, Akio Tajima, Hiroshi Hasegawa, and Ken-ichi Sato, “Enhancing Protection Performance by Effectively Using Spectral Slots of Impairment Aware Elastic Optical Networks [Invited],” OSA/IEEE Journal of Optical Communications and Networking, Vol. 10, Issue 1, pp. A91-A101 (2018) (invited)
Ryota Hashimoto, Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Keita Yamaguchi, Kazunori Seno, and Kenya Suzuki, “First Demonstration of Subsystem-Modular Optical Cross-Connect Using Single-Module 6x6 Wavelength-Selective Switch (invited),” IEEE/OSA J. Lightwave Technologies, Volume 36, Issue 7, April 1, 2018, pp. 1435-1442.
K. Sato, “Realization and Application of Large-scale Fast Optical Circuit Switch for Data Center Networking (invited),” IEEE/OSA J. Lightwave Technologies, Volume 36, Issue 7, April 1 2018, pp. 1411-1419. (invited)
H. Nagai, Y. Mori, H. Hasegawa, and K. Sato, “Design and Verification of Larg-Scale Optical Circuit Switch Using ULCF AWGs for Datacenter Application,” OSA/IEEE Journal of Optical Communications and Networking Vol. 10, Issue 7, B82-B89 (2017).
Mungun-Erdene Ganbold, Hiroki Nagai, Yojiro Mori, Keijiro Suzuki, Hiroyuki Matsuura, Ken Tanizawa, Kazuhiro Ikeda, Shu Namiki, Hitoshi Kawashima, and Ken-ichi Sato, “A Large-Scale Optical Circuit Switch Using Fast Wavelength-Tunable and Bandwidth-Variable Filters,” IEEE Photonics Technology Letters, Volume: 30, Issue: 16, Aug.15, 2018, pp. 1439 ? 1442.
H. Hasegawa, and K. Sato, “Node Architectures and Cost Evaluation for Optical Networks that Adopt Spatial Division Multiplexing,” The Review of Laser Engineering, The Laser Society of Japan, vol. 46, No. 8, August 2018, pp. 420-425.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Large-scale optical switch utilizing multistage cyclic Arrayed-Waveguide Gratings for intra-datacenter interconnection,” IEEE Photonics Journal, Volume: 9, Issue: 1, Article Sequence Number: 7800412, Feb. 2017.
Eiji Oki, Naoya Wada, Satoru Okamoto, Naoaki Yamanaka, and Ken-ichi Sato, “Optical Networking Paradigm: Past, Recent Trends and Future Directions,” IEICE TRANS. COMMUN., Special Issue on the Past, Present, and Future of Communications Technologies in the IEICE, Vol. E100?B, No.9, pp.1564-1580, September, 2017. (Invited)
Kosuke Sato, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Algorithm for raising OXC port count to meet traffic growth at minimum-cost [Invited],” Journal of Optical Communications and Networking, Vol. 9, Issue 2, A263-A270 (2017). (Invited)
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Hiroyuki Matsuura, Kiyo Ishii, Haruhiko Kuwatsuka, Shu Namiki, Toshio Watanabe, and Ken-ichi Sato, “Fast Optical Circuit Switch for Intra-Datacenter Networking,” IEICE Transactions of Communication, Vol.E100?B, No.10 October 2017, pp. 1740-1746 (invited paper).
Tomohiro Ishikawa, Yojiro Mori, Hiroshi Hasegawa, Suresh Subramaniam, Ken-ichi Sato, and Osamu Moriwaki, “Compact OXC architecture, design and prototype development for flexible waveband routing optical networks,” Optics Express, vol. 25, No. 14, pp. 15838-15853, July 2017.
Shuhei Yamakami, Yojiro Mori, Hiroshi Hasegawa, And Ken-ichi Sato “Highly reliable and large-scale subsystem-modular optical cross-connect,” OSA Optics Express, Vol. 25, Issue 15, pp. 17982-17994 (2017).
Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Large-scale optical node utilizing MxM WSSs optimally configured for traffic distribution,” IEEE Photonics Technology Letters, Volume: 29, Issue:16, pp. 1293-1296, August 2017. (invited)
Masahiro Nakagawa, Hiroshi Hasegawa, Ken-ichi Sato, “Dynamic path provisioning and disruption-free reoptimization algorithms for bandwidth on-demand services considering fairness,” IEICE Transactions on Communications Vol.E100-B, No.4, pp. 536-547, April 2017.
Tomohiro Ishikawa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Spectral Efficiency Maximization of Grouped Routing Optical Networks With Shared Protection,” OSA/IEEE Journal of Optical Communications and Networking Vol. 9, Issue 10, pp. 864-875 (2017).
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, and Toshio Watanabe, “Large-scale optical-switch prototypes utilizing cyclic arrayed-waveguide gratings for datacenters,” Journal of Lightwave Technology, volume 34, Issue 2, pp. 608 ? 617, January 15, 2016. (invited)
Shu Namiki, Kiyo Ishii, Ryousei Takano, Tomohiro Kudho, Junya Kurumida Hisato Uetsuka, Kazuhiro Ikeda, Hitoshi Kawashima, Takashi Inoue, Takayuki Kurose, Ken-ichi Sato, “Ultra-low energy dynamic optical path network,” The Journal of the IEICE, Vol.99，No.6, pp.563 -580, May 2016.
Masaki Niwa, Y. Mori, H. Hasegawa, and K. Sato, “Novel optical-node architecture utilizing asymmetric-multiport wavelength-selective switches,” IEEE Photonics Journal, Volume: 8, Issue: 2, April 2016, Article #: 0601210.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, and Toshio Watanabe, “Large-scale and simple-configuration optical switch enabled by asymmetric-port-count sub-switches,” IEEE Photonics Journal, Volume: 8, Issue: 2, April 2016, Article #: 0601610.
Yuki Terada, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Highly spectral efficient networks based on grouped optical path routing,” Optics Express, Vol. 24, No. 6, Mar 2016, pp. 6213-6228.
H. Hasegawa, Y. Mori, K. Sato, “Survivable grouped routing optical networks with dedicated path protection,” IEICE Trans. Commun., VOL.E99-B, No.7, July 2016.
H. Kawase, Y. Mori, H. Hasegawa, and K. Sato, “Dynamic router performance control utilizing support vector machines for energy consumption reduction," IEEE Transactions on Network and Service Management, Vol.13, Issue 4, December 2016, pp. 860-870.
Kosuke Sato, H. Hasegawa, and K. Sato, “Disruption-Free Expansion of Protected Optical Path Networks that Utilize Subsystem Modular OXC Nodes,” OSA J. Optical Commun. Network, JOCN, VOL.8, NO.7, JULY 2016, pp. 476-485.
M. Niwa Y. Mori, H. Hasegawa, and K. Sato, “Tipping point for the future scalable OXC: What size MxM WSS is needed?” Journal of Optical Communications and Networking, Vol. 9, Issue 1, A.18-A.25 (2017). (Invited).
Ken-ichi Sato, “Message from the President: Structuring the IEICE as a crucible of innovation,” The Journal of the IEICE, Vol. 99, No. 7, 2016, pp. 630-636. (Invited)
H. Hasegawa, S. Subramaniam, K. Sato, “Node architecture and design of flexible waveband routing optical networks,” J. Optical Communication Network, JOCN, Vol. 8, No. 10, October 2016, pp. 734-744.
Ken-ichi Sato, “Communication network paradigm shift spurred by contents providers, and prospects for future photonic networks,” The Journal of the IEICE, Vol. 99, No. 11, 2016, pp. 1053-1059. (Invited)
Z. Shen, H. Hasegawa, K. Sato, “Integrity enhancement of flexible/semi-flexible grid networks that minimizes disruption in spectrum defragmentation and bitrate dependent blocking,” IEEE/OSA Journal of Optical Communications Network, Vol.7, No.4, April 1, 2015, pp. 235-247.
Ken-ichi Sato,“Optical technologies for the future”OPTRONICS, No. 401, pp. 48-51, May 2015. (invited)
S. Takashina, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Wavelength-tunable filters utilizing arrayed waveguide gratings for Colorless/Directionless/Contentionless optical signal drop in ROADMs,” IEEE Photonics Journal, Volume 7, Number 1, February 2015.
Y. Tanaka, H. Hasegawa, K. Sato, “Performance analysis of large-scale OXC that enables dynamic modular growth,” OpticsExpress, Vol. 23, Iss. 5, pp. 5994?6006 (2015).
H. Ishida, H. Hasegawa, K. Sato,“Hardware scale and performance evaluation of compact subsystem modular optical cross connect that adopts tailored Add/Drop architecture,” IEEE/OSA Journal of Optical Communications Network, Vol.7, No.6, June 2015, pp. 586-596.
S. Takashina, H. Ishida, M. Niwa, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Experimental verification of highly scalable OXC that consists of subsystem-modular express-switch part and multicast-switch-based add/drop part enabling total throughput of 314 Tbps,” IEEE Optics Express, Vol. 23, No. 11, May 2015, pp. 14796-14805.
Akihiro Kadohata, Takafumi Taanaka, Atsushi Watanabe, Akira Hirano, Hiroshi Hasegawa, and Ken-ichi Sato, “Differential reliability path accommodation design and recon?guration in virtualized multi-layer transport network,” IEICE Trans. on Communications, Vol. E98-B, No. 11, pp. 2151?2159, November 2015.
Y. Tanaka, H. Hasegawa, K. Sato, “Criteria for selecting subsystem configuration in creating large-scale OXCs,” Journal of Optical Communications and Networking Vol. 7, Issue 10, pp. 1009-1017 (2015).
Akihiro Kadohata, Atsushi Watanabe, Akira Hirano, Hiroshi Hasegawa, and Ken-ichi Sato, “Pre-adjustment rerouting for wavelength defragmentationin optical transparent WDM networks,” IEICE Trans. on Communications, Vol.E98-B, No.10, October 2015, pp. 2014-2021.
Kiyo Ishii, Junya Kurumida, Ken-ichi Sato, Tomohiro Kudoh, and Shu Namiki, "Unifying top-down and bottom-up approaches to evaluate network energy consumption." IEEE Journal of Lightwave Technology, Vol. 33, Issue 21, August 2015, pp. 4395-4405.
Z. Shen, H. Hasegawa, K. Sato, T. Tanaka, and A. Hirano, “A novel elastic optical path network that utilizes bitrate-specific anchored frequency slot arrangement,” Optics Express, Vol. 22, Iss. 3, pp. 3169?3179, February 2014. ECOC 2013 Special Issue (invited submission as the best papers from ECOC 2013).
L. H. Chau, H. Hasegawa and K. Sato, “Performance evaluations of large-scale multi-stage hetero-granular optical cross-connects,” Optics Express, Vol. 22, Iss. 3, pp. 3157?3168, February 2014. ECOC 2013 Special Issue (invited submission as the best papers from ECOC 2013).
Y. Iizawa, S. Araki, S. Ishida, I. Nishioka, K. Shimada, H. Hasegawa, K. Sato, “PCE-based fast path control in multi-domain photonic networks,” ELSEVIER, Optical Switching and Networking, vol. 10, Issue 1, January 2013, pp. 32-43.
Z. Shen, H. Hasegawa, and K. Sato, "An efficient heuristic waveband assignment algorithm for hierarchical optical path networks utilizing wavelength convertors," ELSEVIER, Optical Switching and Networking, Volume 10, Issue 1, January 2013, Pages 54?61.
K. Sato, “Prospects of future photonic networking technologies,” Vol. J96-B, No. 3, pp. 220-232, March 2013. (invited)
T. Ban, K. Ishii, H. Hasegawa, K. Sato, H. Takahashi, and M. Okuno, “Performance evaluation of large capacity ultra-compact waveband cross-connect,” IEEE Photonics Technology Letters, Vol. 25, Issue 5, pp. 446-449, March 2013.
M. Sato, H. Hasegawa, and K. Sato, “Efficient shared protected network design algorithm that iterates path relocation with new resource utilization metrics,” IEICE, vol. E96-B, No. 04, pp. 956-966, April 2013.
Y. Iwai, H. Hasegawa, and K. Sato, “A large-scale photonic node architecture that utilizes interconnected OXC subsystems,” OSA Optics Express, Vol. 21 Issue 1, January 14, 2013, pp.478-487 (2013).
T. Ban, H. Hasegawa, K. Sato, T. Watanabe, and H. Takahashi, “A novel large-scale OXC architecture and an experimental system that utilizes wavelength path switching and fiber selection,” OSA Optics Express, Vol. 21 Issue 1, pp.469-477 (2013).
H. Hasegawa, and K. Sato, “Hierarchical optical cross-connect node architecture,” Japanese journal of optics, Optical Society of Japan, Vol. 42, No. 05, pp. 229-235, May 2013.
Y. Taniguti, Y. Yamada, H. Hasegawa, and K. Sato, “Coarse granular optical routing networks utilizing fine granular add/drop,” IEEE/OSA Journal of Optical Communications and Networking, Vol. 5, Issue 7, pp. 774-783 (2013).
K. Sato, H. Hasegawa, and T. Watanabe, “Large scale wavelength routing optical switch for data center networks,” IEEE Communications Magazine, vol. 51, No. 9, September 2013, pp. 46-52. (Invited)
Zhi-shu Shen, Hiroshi Hasegawa, and Ken-ichi Sato, “Effectiveness of wavelength/waveband conversion and its allowable cost bound for hierarchical optical path networks,” IEEE/OSA JOCN, Vol. 5, Iss. 11, November, 2013; pp: 1262-1274.
F. Naruse, H. Hasegawa, and K. Sato, "Virtual fiber networking and impact of optical path grooming on creating efficient layer one services,” IEICE Trans. Commun., Vol.E95-B, No.03, pp. 723-729, March 2012.
Y. Yamada, H. Hasegawa, and K. Sato, "Optical node architecture that utilize dedicated add/drop switches to realize colorless, directionless and contentionless capability," IEICE Trans. Commun., vol. E95-B, No. 4, April 2012, pp. 1307-1316.
Y. Yamada, H. Hasegawa, and K. Sato, " Effects of optical layer protection granularity in survivable hierarchical optical path network," IEICE Trans. on Communications, vol. E95-B, No.9, September 2012, pp.2959-2963.
F. Naruse, Y. Yamada, H. Hasegawa, and K. Sato, “Evaluations of OXC hardware scale and network resource requirements of different optical path add/drop ratio restriction schemes [Invited],” IEEE/OSA Journal of Optical Communications and Networking (JOCN), vol. 4, No. 11, pp. B26?B34, November, 2012. (invited)
T. Ogawa, H. Hasegawa, K. Sato, “Optical fast circuit switching networks employing dynamic waveband tunnel,” IEICE, vol. E95-B, No. 10, October 2012, pp. 3139-3148.
H. Ito, H. Hasegawa, and K. Sato, “Router power saving employing dynamic performance control based on traffic predictions,” IEICE Trans. Commun., Vol. E95-B, No. 10, pp. 3130-3138, October 2012.
T. Niwa, H. Hasegawa, K. Sato, T. Watanabe, H. Takahashi, M. Okuno, “Novel wavelength tunable filter offering multi-stage selection for colorless, directionless, and contentionless ROADMs,” IEICE Electronics Express, vol. 9, No. 16, August 2012, pp. 1297-1303.
T. Niwa, H. Hasegawa, K. Sato, T. Watanabe, and H. Takahashi, “A large port count wavelength routing optical switch that consists of cascaded small-size cyclic Arrayed Waveguide Gratings,” IEEE Photonics Technology Letters, vol. 24, Issue 22, pp. 2027-2030, November 2012.
T. Takagi, H. Hasegawa, K. Sato, Y. Sone, A. Hirano, and Masahiko Jinno, “Impact of elastic optical paths that adopt distance adaptive modulation to create efficient networks,” IEICE, vol. E95-B, No.12, pp. 3793-3801, December 2012.
O. Moriwaki, K. Noguchi, H. Takahashi, T. Sakamoto, K. Sato, H. Hasegawa, M. Okuno, and Y. Ohmori, “Development of Terabit-scale compact hierarchical optical cross-connect system using planar device integration,” IEEE Journal of Lightwave Technology, vol. 29, No. 4, February 2011, pp. 449-455.
R. Hirako, H. Hasegawa, K. Sato, and M. Okuno, and O. Moriwaki, “Compact matrix-switch-based hierarchical optical path cross-connect with colorless waveband add/drop ratio restriction,” IEICE Special Issue on Photonic Network Technologies in Terabit Network Era, 2011, IEICE Trans. Commun., Vol. E94-B, No. 4, April 2011, pp. 918-927.
L. H. Chau, H. Hasegawa, and K. Sato, “Hybrid hierarchical optical path network design algorithms utilizing ILP optimization,” Elsevier, Optical Switching and Networking, Special Issue, vol. 8, 2011, pp. 226-234.
Y. Yamada, H. Hasegawa, and K. Sato, "Hierarchical optical path network design with dedicated wavelength path protection," Journal of Lightwave Technology, vol. 29, No. 21, Nov. 2011, pp. 3196-3209.
H. Ohno, H. Hasegawa, and K. Sato, “A dynamic and quasi-centralized RWA method for optical fast circuit switching networks employing route pre-prioritization,” Elsevier, Optical Switching and Networking, Special Issue, vol. 8, No. 4, December 2011, pp. 242-248.
K. Ishii, S. Mitui, H. Hasegawa, K. Sato, S. Kamei, M. Okuno, and H. Takahashi, “Development of hierarchical optical path cross-connect systems employing wavelength/waveband selective switches,” IEEE/OSA Journal of Optical Communications and Networking, Vol. 3, Issue 7, pp. 559-567, July 2011.
L. H. Chua, H. Hasegawa and K. Sato, “Impact of electrical grooming and regeneration of wavelength paths in creating hierarchical optical path networks,” OSA, Optics Express, vol. 19, No. 26, December 2011, B882-B894.
K. Ishii, H. Hasegawa, and K. Sato, “Wavelength assignment for concatenated ROADM ring networks and switch scale reduction in a concatenating node,” Journal of Optical Communications and Networking (JOCN), vol. 2, No. 1, January 2010, pp. 67-79.
K. Ishii, O. Moriwaki, H. Hasegawa, and K. Sato, Y. Jinnouchi, M. Okuno, and H. Takahashi, “Development of hierarchical optical cross-connect system for ROADM-ring connection using PLC technologies,” Photonics Technology
Volume: 22, No. 7, pp. 489-500, 2010.
Y. Yamada, H. Hasegawa, and K. Sato, "Hierarchical optical path network design algorithm considering waveband protection," Journal of Lightwave Technology, vol. 27, No. 24, Dec. 2009, pp. 5736-5748.
K. Ishii, H. Hasegawa, K. Sato, M. Okuno, and H. Takahashi “Ultra-compact waveband cross-connect module using waveband selective switches: development and performance verification,” Photonics Technology Letters, IEEE
Vol. 22, No. 23, pp. 1741-1743, December 2010.
K. Sato, “Role of optical network technologies that allow sustainable evolution of information and communication network,” The Journal of the IEICE, vol. 93, No. 8, pp. 654-658, August 2010.
O. Moriwaki, K. Noguchi, H. Takahashi, T. Sakamoto, K. Sato, H. Hasegawa, M. Okuno, and Y. Ohmoroi, " Multi-hop signal transmission experiments employing PLC-based hierarchical optical cross-connect system," IEEE Photonic Technology Letters, vol. 22, No. 21, November 2010, pp. 1586-1588.
L. H. Chau, H. Hasegawa, K. Sato, “Hierarchical Optical Path Network Design Algorithm Considering Waveband Add/Drop Ratio Constraint,” IEEE/OSA Journal of Optical Communications and Networking, JOCN, vol. 2, No. 10, October 2010, pp. 872-882.
S. Kakehashi, H. Hasegawa, K. Sato, O. Moriwaki, and S. Kamei, "Analysis and development of fixed and variable waveband MUX/DEMUX utilizing AWG routing functions," IEEE JLT, vol. 27, No. 1, January 2009, pp. 30-40.
K. Sato and H. Hasegawa, “Optical networking technologies that will create future bandwidth abundant networks,” Journal of Optical Communications and Networking, Special Issue on Optical Networks for Future Internet, vol. 1, No. 2, July 2009 [Invited], pp. A81-A93. A paper selected for Spotlight on Optics of OSA in July 2009. (Invite)
K. Kanie, H. Hasegawa, and K. Sato, "Quasi-Dynamic Network Design Considering Different Service Contract Terms," IEEE J-SAC, OCN, vol. 26, No. 3, April 2008, pp. 47-53.
S. Kakehashi, H. Hasegawa, K. Sato, O. Moriwaki, and S. Kamei, "Optical cross-connect switch architectures for hierarchical optical path networks," IEICE Trans. Commun., vol. E91-B, No. 10, October 2008, pp. 3174-3184.
Yagyuu, H. Hasegawa, and K. Sato, "An efficient hierarchical optical path network design algorithm based on traffic demand expression in a Cartesian produce space," IEEE Journal of Selected Areas in Communications (J-SAC), Supplement on Optical Communications and Networking (OCN), vol. 26, No. 6, August 2008, pp. 22-31.
K. Sato, "Recent developments in and challenges of photonic networking technologies," IEICE Trans. Commun., vol. E90-B, No. 3, March 2007, pp. 454-467.
K. Sato, "Advances in photonic network technologies," The IEICE Communications Society Magazine, No. 1,June 2007, pp. 76-88, (in Japanese).
K. Sato and H. Hasegawa, "Prospects and challenges of multi-layer optical networks," IEICE Trans. Commun., Vol. E90-B, No. 8, pp. 1890-1902, 2007.
Moriwaki, K. Suzuki, H. Takahashi, Y. Sakai, K. Sato, and S. Kakehashi, "Loop-back AWG Router with Non-uniform Transmission Capacity," IEEE Photonic Technology Letters, vol. 19, No. 17, September 2007, pp. 1319-1321.
S. Kakehashi, H. Hasegawa, K. Sato, O. Moriwaki, S. Kamei, Y. Jinnouchi, and M. Okuno, "Performance of Waveband MUX/DEMUX Using Concatenated AWGs, " IEEE Photonic Technology Letters, vol. 19, No. 16, August 2007, pp. 1197-1199.
S. Kakehashi, H. Hasegawa, K. Sato and O. Moriwaki, "Formulation of waveguide connection for waveband MUX/DEMUX using concatenated Arrayed-Waveguide Gratings," IEICE Trans. Commun. Letter, vol. E90-B, No. 10, October 2007, pp. 2950-2952.
S. Kaneda, T. Uyematsu, N. Nagatsu and K. Sato, "Network design and cost optimization for label switched multi-layer photonic IP networks," IEEE J-SAC, vol. 23, No. 8, August 2005, pp. 1612-1619.
Ken-ichi Kitayama1, Tetsuya Miki, Toshio Morioka, Hideaki Tsushima, Masafumi Koga, Kazuyuki Mori, Soichiro Araki, Ken-ichi Sato, Hiroshi Onaka, Shu Namiki, and Tomonori Aoyama, "Photonic network R&D activities in Japan - Current activities and future perspectives -," IEEE J. Lightwave Technology, vol. 23, No. 10, October 2005, pp. 3404-3418.
K. Tada, K. Kikuchi and K. Sato, "Dispersion of photoelastic coefficients in ZnSe, " Jpn. J. Appl. Phys., vol. 16, No. 5, pp. 757-760, May 1977.
K. Sato and M. Aoki, "Photoluminescent properties of ZnS grown from tellurium solution, " Jpn. J. Appl. Phys., vol. 18, No. 3, pp. 705-706, Mar. 1979.
M. Washiyama, K. Sato and M. Aoki, "Solution grown of ZnS, ZnSe, CdS and their mixed compounds using tellurium as a solvent", Jpn. J. Appl. Phys., vol. 18, No. 5, pp. 869-872, May 1979.
T. Matsumoto, K. Sato and I. Nakagawa, "Estimation of bandwidths of long-distance graded-index multimode fibers," Trans. IECE Japan, vol. 62-B, No. 12, pp. 1163-1170, Dec. 1979, (in Japanese).
T. Matsumoto and K. Sato, "Polarization-independent optical circulator: an experiment," Appl. Opt. vol. 19, No. 1, pp. 108-112, Jan. 1980.
K. Sato and K. Asatani, "Analog baseband TV transmission experiments using semiconductor laser diodes," Electron. Letters, vol. 15, No. 24, pp. 794-795, Nov. 1979.
K. Sato and K. Asatani, "A study on analog video transmission using semiconductor laser diodes," Trans. IECE Japan, vol. 63-B, No. 11, pp. 1086-1093, Nov. 1980, (in Japanese).
K. Sato and K. Asatani, "Superimposed pulse modulation for fiber optic analog video transmission using semiconductor laser diodes," Electron. Letters, vol. 16, No. 14, pp. 538-540, July 1980.
K. Asatani, K. Sato, K. Maki and T. Miki, "Fiber optic analog transmission experiment for high-definition television signals using semiconductor laser diodes," Electron. Letters, vol. 16, No. 14, pp. 536-538, July 1980.
K. Sato and K. Asatani, "Speckle noise reduction in fiber optic analog video transmission using semiconductor laser diodes," IEEE Trans. on Commun., vol. COM-29, No. 7, pp. 1017-1024, July 1981.
K. Sato and K. Asatani, "Linearity in fiber-optic analog transmission systems using laser diodes," Trans. IECE Japan, vol. E64, No. 10, pp. 646-652, Oct. 1981.
K. Sato, "Intensity noise of semiconductor laser diodes in fiber optic analog video transmission, " IEEE J. Quantum Electron., vol. QE-19, No. 9, pp. 1380-1391, Sept. 1983.
S. Aoyagi, K. Sato and T. Kitami, "Fiber-optic analog/digital hybrid signal transmission employing FM", J. IECE Japan, vol. J67-B, No. 8, pp. 926-927, August 1984, (in Japanese).
K. Sato, S. Aoyagi and T. Kitami, "Fiber-optic analog/digital hybrid signal transmission employing frequency modulation," IEEE Trans. on Commun., vol. COM-33, No. 5, May 1985, pp. 433-441.
K. Sato, S. Aoyagi and T. Kitami, "Fiber-optic video transmission employing square wave frequency modulation," IEEE Trans. on Commun., vol. COM-33, No. 5, May 1985, pp. 417-424.
Y. Sato and K. Sato, "Delay analysis of multi-node queueing system," Trans. on IEICE Japan, vol. J71-B, No. 6, pp. 669-677, June 1988, (in Japanese).
K. Sato, S. Ohta and I. Tokizawa, "Broadband transport network architecture based on Virtual Path concept," Trans. on IEICE Japan, vol. J72-B-I, No. 11, pp. 904-916, November 1989, (in Japanese).
Y. Sato and K. Sato, "Statistical multiplexing characteristics of multimedia traffic in high-speed burst transport system," Trans. on IEICE Japan, vol. J72-B-I, No. 11, pp. 1112-1119, November 1989, (in Japanese).
H. Nakada and K. Sato, "Variable rate speech coding for Asynchronous Transfer Mode," IEEE Trans. Commun., vol. 38, No. 3, March 1990, pp. 277-284.
K. Sato, S. Ohta and I. Tokizawa, "Broad-band ATM network architecture based on Virtual Paths, " IEEE Trans. Commum., vol. 38, No. 8, pp. 1212-1222, August 1990.
Y. Sato and K. Sato, "Virtual path and link capacity design for ATM networks," IEEE J-SAC, vol. 9, No. 1, January 1991, pp. 104-111.
H. Saito, K. Kawashima and K. Sato, "Traffic control technologies in ATM networks," IEICE Transactions, vol. E 74, No. 4, April 1991, pp. 761-771.
R. Kawamura, H. Hadama and K. Sato, "Self-healing techniques utilizing Virtual Path concept for ATM networks," Trans. on IEICE Japan, vol. J74-B-I, No. 7, pp. 537-546, November 1991, (in Japanese).
K. Sato, H. Ueda and N. Yoshikai, "The roll of Virtual Path cross-connection," IEEE LTS (The Magazine of Lightwave Telecommunication Systems), vol. 2, No. 3, August 1991, pp. 44-54.
N. Yamanaka, Y. Sato and K. Sato, "Performance limitation of leaky bucket algorithm for usage parameter control and bandwidth allocation methods," IEICE Trans. Commun., vol. E75-B, No. 2, February 1992, pp. 82-86.
S. Ohta and K. Sato, "Dynamic bandwidth control of the Virtual Path in an Asynchronous Transfer Mode network," IEEE Trans. on Commun., vol. 40, No. 7, July 1992, pp. 1239-1247.
Y. Sato and K. Sato, "Evaluation of statistical cell multiplexing effects and path capacity design in ATM networks," IEICE Trans. Commun., vol. E75-B, No. 7, July 1992, pp. 642-648.
N. Yamanaka, Y. Sato and K. Sato, "Traffic shaping for VBR traffic in ATM networks," IEICE Trans. Commun., vol. E75-B, No. 10, October 1992, pp. 1105-1108.
N. Yamanaka, Y. Sato and K. Sato, "Precise UPC scheme suitable for ATM networks characterized by widely ranging traffic parameter values," IEICE Trans. Commun., vol. E75-B, No. 12, Dec. 1992, pp. 1367-1372.
N. Yamanaka, Y. Sato and K. Sato, "Precise UPC scheme and bandwidth allocation methods for ATM-based B-ISDN characterized by wide-ranging traffic parameter values," Int. Journal of Digital and Analog Communication Systems, vol. 5, No.4, October-November 1992, pp. 203-215.
T. Aoyama, I. Tokizawa and K. Sato, "Introduction strategy and technologies for ATM VP-based broadband network," IEEE J-SAC, vol. 10, No. 9, December 1992, pp. 1434-1447.
N. Yamanaka, Y. Sato and K. Sato, "Usage parameter control and bandwidth allocation methods considering cell delay variation in ATM networks," IEICE Trans. Commun., vol. E76-B, No. 3, March 1993, pp. 270-279.
T. Aoyama, I. Tokizawa and K. Sato, "ATM VP-based broadband networks for multimedia services," Communications Magazine, April 1993, pp. 30-39.
Y. Sato, N. Yamanaka and K. Sato, "Traffic Management for CBR-VPs Considering Cell Delay Variation," Trans. on IEICE Japan, vol. J76-B-I, No. 5, 1993, pp. 416-418 (in Japanese).
Y. Sato and K. Sato, "Smoothing control of CBR cell traffic in ATM networks," Trans. on IEICE Japan, vol. J76-B-I, No. 10. 1993, pp. 736-739 (in Japanese).
R. Kawamura, H. Hadama, K. Sato and I. Tokizawa, "Fast VP-bandwidth management with distributed control in ATM networks," IEICE Trans. Commun., vol. E77-13, No. 1, January 1994, pp. 5-14.
H. Hadama, R. Kawamura and K. Sato, "Virtual Path restoration techniques with centralized control functions in ATM networks," IEICE Trans. on IEICE Japan, B-I vol. J77-B-I, No. 3, pp. 115-123, March 1994 (in Japanese).
K. Sato, S. Okamoto and H. Hadama, "Network performance and integrity enhancement with optical path layer technologies," IEEE Journal of Selected Areas in Communications, vol. 12, No. 1, January 1994, pp. 159-170.
R. Kawamura, K. Sato and I. Tokizawa, "Self-healing ATM networks based on Virtual Path concept," IEEE Journal of Selected Areas in Communications, vol. 12, No. 1, January 1994, pp. 120-127.
Y. Hamazumi, N. Nagatsu, S. Okamoto and K. Sato, "Number of wavelengths required for constructing optical path network considering failure restoration," Trans. on IEICE Japan, vol. J77-B-I, No. 5, 1994, pp. 275-284 (in Japanese).
N. Yamanaka, Y. Sato and K. Sato, "Traffic management method for ATM network using precise UPC scheme," Trans. on IEICE Japan, vol. J76-B-I, No. 3. 1993, pp. 253-263 (in Japanese).
A. Watanabe, S. Okamoto and K. Sato, "Optical path cross-connect node architecture with high modularity for photonic transport network," IEICE Trans. Commun., vol. E77-B, No. 10, October. 1994, pp. 1220-1229.
S. Okamoto, A. Watanabe and K. Sato, "A new optical path cross-connect system architecture utilizing delivery and coupling matrix switch," IEICE Trans. Commun., vol. E77-B, No. 10, October 1994, pp. 1272-1274.
N. Nagatsu, Y. Hamazumi and K. Sato, "Number of wavelengths required for constructing large scale optical path networks," Trans. on IEICE Japan, vol. J77-B-I, No. 12, December 1994, pp. 728-737 (in Japanese).
N. Nagatsu, Y. Hamazumi and K. Sato, "Optical path accommodation designs applicable to large scale networks," IEICE Transactions on Communications, vol. E78-B, No. 4, April 1995, pp. 597-607.
N. Yamanaka, T. Takenaka, Y. Sato and K. Sato, "Jitter tolerant usage parameter control method for ATM-based B-ISDN," IEICE Transactions on Communications, Special Issue on Traffic & Quality Control for Communication Networks, Vol. E78-B-I, No.4, April 1995, pp. 485-493.
A. Watanabe, S. Okamoto and K. Sato, "Optical path cross-connect node architecture offering high modularity for Virtual Wavelength Paths," Trans. on IEICE Japan, vol. E78-B, No. 5, May 1995, pp. 686-693.
H. Hadama, K. Sato and I. Tokizawa, "Analyses of Virtual Path bandwidth control effects in ATM networks," IEICE Trans. on Commun., vol. E78-B, No. 6, June 1995, pp.907-915.
N. Yamanaka, Y. Sato and K. Sato, "Performance limitation of the leaky bucket algorithm for ATM networks," IEEE Trans. on Commun., vol. 43, No. 8, August 1995, pp. 2298-2300.
M. Koga, Y. Hamazumi, A. Watanabe and K. Sato, "Optical path cross-connect systems transport experiment with simulated five-node network," Electronics Letters vol. 31, No. 17, August 1995, pp. 1470-1471.
N. Nagatsu, and K. Sato, "Optical path accommodation design enabling cross-connect system scale evaluation," IEICE Trans. on Communications, vol. E78-B, No. 9, september 1995, pp. 1339-1343.
M. Teshima, M. Koga and K. Sato, "Multiwavelength simultaneous monitoring circuit employing wavelength crossover properties of arrayed-waveguide grating," Electronics Letters, vol. 31, No. 18, August 1995, pp. 1595-1597.
K. Sato, S. Okamoto and A. Watanabe, "Photonic transport networks based on optical paths," International Journal of Communication Systems, vol. 8, No. 6, November-December 1995, pp. 377-389.
Y. Hamazumi, A. Watanabe, M. Koga, M. Ishii, S. Suzuki and K. Sato, "4x4 port optical path cross-connection with 8x2.5 Gb/s unequally-spaced channel 4x100 km transportation," IEE Electronics Letters, vol. 32, No.8, April 1996, pp. 746-747.
Y. Sato, N. Yamanaka and K. Sato, "ATM network resource management techniques for CBR virtual Paths/channels," IEICE Trans. on Communications, vol. E79-B, No. 5, May 1996, pp. 684-692.
Y. Hamazumi, M. Koga and K. Sato, "Beat induced crosstalk reduction against wavelength difference between signal and four-wave mixing lights in unequal spacing WDM transmission," IEEE Photonics Technology Letters, vol. 8, No. 5, May 1996, pp. 718-720.
M. Koga, Y. Hamazumi, A. Watanabe, S. Okamoto, H. Obara, K. Sato, S. Suzuki and M. Okuno, "Design and performance of optical path cross-connect system based on wavelength path concept," Special Joint Issue of IEEE Journal of Lightwave Technology and IEEE Journal on Selected Areas in Communications, vol. 14, No. 6, June 1996, pp.1106-1119.
S. Okamoto, A. Watanabe and K. Sato, "Optical path cross-connect architectures for photonic transport network," Special Joint Issue of IEEE Journal of Lightwave Technology and IEEE Journal on Selected Areas in Communications, vol. 14, No. 6, June 1996, pp. 1410-1422.
N. Nagatsu, S. Okamoto and K. Sato, "Optical path cross-connect system evaluation using path accommodation design for restricted wavelength multiplexing," Special Joint Issue of IEEE Journal on Selected Areas in Communications and IEEE Journal of Lightwave Technology, vol. 14, No. 5, June 1996, pp. 893-902.
M. Koga, A. Watanabe, S. Okamoto, K. Sato and M. Okuno, "8x16 delivery-and-coupling type optical switches for a 320-Gibabit/s throughput optical path cross-connect system," Electronics Letters, vol. 32, No. 13, June 1996, pp. 1213-1214.
M. Koga, Y. Hamazumi, K. Sato and Y. Ohmori, "Transport experiment of 320-Gbit/s throughput non-regenerative optical path cross-connect system," Electronics Letters, vol. 32, No. 17, August 1996, pp. 1607-1608.
A. Watanabe, S. Okamoto and K. Sato, "Optical path cross-connect system architecture suitable for large scale expansion," IEEE Journal of Lightwave Technology, vol. 14, No. 10, October 1996, pp.2162-2172.
M. Teshima, M. Koga and K. Sato, "Design and performance of multiwavelength simultaneous monitoring circuit employing arrayed-waveguide grating," IEEE Journal of Lightwave Technology, vol. 14, No. 10, October 1996, pp.2277-2285.
K. Sato, "Photonic transport network OAM technologies," IEEE Communications Magazine, Special issue on "Operation and management of broadband networks," vol. 34, No. 12, December 1996, pp.86-94.
A. Watanabe, S. Okamoto, M. Koga, K. Sato and M. Okuno, "8x16 delivery and coupling switch board for 320Gb/s throughput optical path cross-connect system," Electronics Letters, vol. 33, No. 1, January 1997, pp. 67-68.
Y. Hamazumi, M. Koga, M. Ishii, S. Suzuki and K. Sato, "Transport performance in optical path cross-connect system employing unequally spaced channel allocation," IEEE Journal of Lightwave Technologies, vol.15, No. 4, April 1997, pp. 616-627.
K. Sato and H. Toba, "Trends of photonic transport network technologies," IEICE Trans. on Communications, The Journal of the IEICE, vol. 80, No. 9, September 1997, pp. 947-959 (in Japanese).
S. Okamoto, K. Oguchi and K. Sato, "Network architecture for optical path transport networks," IEEE Transactions on Communications, vol. 45, No. 8, August 1997, pp. 968-977.
K. Sato and N. Takachio, "Photonic network and WDM," O plus E, Ohm Publishing Co., No. 215, October 1997, pp. 90-99 (in Japanese).
N. Nagatsu, S. Okamoto and K. Sato, "Architectural analysis of multiple fiber ring networks employing optical paths," IEEE Journal of Lightwave Technology, vol. 15, No. 10, October 1997, pp.1794-1804.
A. Watanabe, S. Okamoto, M. Koga, K. Sato and M. Okuno, "Design and performance of delivery and coupling switch board for large scale optical path cross-connect system," IEICE, vol. E81-B, No. 6, June 1998, pp.1203-1212.
(M. Koga, A. Watanabe, T. Kawai, K. Sato and Y. Ohmori , "Large-capacity optical path cross-connect system for WDM photonic transport network," J-SAC, vol. 16, No. 7, September 1998, pp. 1260-1269.
K. Sato, "Introduction strategy of photonic network technologies to create bandwidth abundant multimedia networks," Trends in Optics and Photonics; Optical Society of America, vol. 20, June 1998, pp. 9-17.
H. Yoshimura, K. Sato and N. Takachio, "Future photonic transport networks based on WDM technologies," IEEE Communications Magazine, vol. 37, No. 2, February 1999, pp. 74-81.
Y. Hamazumi, T. Kawai, M. Koga, and K. Sato, "Compact 8x8 optical switching board implemented with connection supervision and optial power control function," IEEE, Photonic Technology Letters, vol. 11, No. 3, March 1999, pp. 370-372.
K. Sato and S. Okamoto, "Photonic transport technologies to create robust backbone networks," IEEE Communications Magazine, vol. 37, No. 8, August 1999, pp.78-87.
N. Nagatsu, S. Okamoto, K. Koga and K. Sato, "Flexible OADM architecture and its impact on WDM ring evolution for robust and large-scale optical transport networks," IEICE Trans. Commun., vol. E82-B, No. 8, August 1999, pp. 1105-1114.
A. Watanabe, S. Okamoto, and K. Sato, "Robust backbone network utilizing WDM optical paths," IEICE Trans. Commun., vol. E82-B, No. 8, August 1999, pp. 1115-1120.
K. Sato and H. Toba, "Dense WDM Transmission," Kougaku, vol.29, No. 3, pp.120-130, 2000 (in Japanese).
M. Aoki, K. Yukimatsu and K. Sato, "Digital communications," The Journal of the IEICE, vol. 83, No. 1, January 2000, pp. 23-27 (in Japanese).
S. Okamoto, M. Koga, A. Watanabe and K. Sato, "IP backbone network utilizing photonic transport network technologies," Optical Networks Magazine, vol. 1, No. 1, January 2000, pp. 19-28
K. Sato, “Photonic transport networks based on wavelength division multiplexing technologies,” Philosophical Transactions of The Royal Society, Mathematical, Physical and Engineering Sciences, vol. 358, No. 1773, August 2000, pp. 2265-2281.
H. Takara, T. Ohara, K. Mori, K. Sato, E. Yamada, T. Inoue, T. Shibata, M. Abe, T. Morioka, and K-I Sato, "More than 1000 channel optical frequency chain generation from single supercontinuum source with 12.5 GHz channel spacing," IEE Electronics Letters, vol.36, no.25, 2000, pp. 2089-2090.
K. Sato and K. Kitayama, "Cutting-edge technologies on photonic backbone networks," The Journal of the IEICE, vol. 85, No. 2, February 2002, pp. 94-103 (in Japanese).
K. Sato, "Recent progress in broadband photonic transport network development," IEICE Trans. on Electronics, vol. J85, No. 5, May 2002, pp. 333-347 (in Japanese).
K. Sato, N. Yamanaka, Y. Takigawa, M. Koga, S. Okamoto, K. Shiomoto, E. Oki and W. Imajuku, "GMPLS-based photonic multi-layer router (Hikari router) architecture: An overview of traffic engineering and signaling technology," IEEE Communications Magazine, vol. 40, No.3, March 2002, pp. 96-101.
Y. Takigawa, M. Koga and K. Sato, “Photonic router: development of the next generation router technology,” The Journal of the IEICE, vol. 86, No. 2, pp. 78-81, February 2003.
K. Shimano, A. Sahara, K. Noguchi, M. Koga, Y. Takigawa and K. Sato, "Fast restoration on network control plane established through photonic MPLS routers," IEICE Trans. on Commun., vol. E86-B, No. 5, May 2003, pp. 1522-1529.
Watanabe, K. Noguchi, K. Shimano, T. Kawai, E. Yoshida, A. Sahara, T. Takahashi, S. Okamoto, T. Goh, Y. Takigawa, M. Koga, and K. Sato, "Photonic MPLS router to create bandwidth-abundant IP networks," IEEE Journal of Lightwave Technology, vol. 21, No. 11, November 2003, pp. 2851-2862.
S. Kaneda, T. Uyematsu, N. Nagatsu and K. Sato, "Network design for multi-layered photonic IP networks considering IP traffic growth," IEICE Trans. Commun., vol. E87-B, No. 2, February 2004.
International Conference/Workshop Papers

International Conference/Workshop Papers

Ryuta Shiraki, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Highly spectrally efficient metro networks that adopt fiber-level granular routing on overlaid line-/ring-shaped virtual topologies,” Metro and Data Center Optical Networks and Short-Reach Links III, part of SPIE OPTO, 2020
Kazuya Okamura, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Quasi-Nyquist WDM networks using receiver-side quadrature duo-binary/quaternary spectrum shaping,” Metro and Data Center Optical Networks and Short-Reach Links III, part of SPIE OPTO, 2020.
Ryosuke Matsumoto, Takashi Inoue, Ryotaro Konoike, Hiroyuki Matsuura, Keijiro Suzuki, Yojiro Mori, Kazuhiro Ikeda, Shu Namiki, and Ken-ichi Sato, “Scalable and Fast Optical Circuit Switch Created with Silicon-Photonic Tunable-Filter-based Local Oscillator Bank and Colorless Coherent Detection,” Optical Fiber Communication Conference 2020 (OFC 2020), W2A.36, 8?12 March 2020, San Diego.
Ken-ichi Sato, “Design and Performance of Optical Switching Technologies for Data Center Networks,” Optical Fiber Communication Conference 2020 (OFC 2020), Workshop; Are Radical Photonic Devices and Architectures Needed for Future Data Centers?, 8?12 March 2020, San Diego.
Eiji Honda, Yojiro Mori1 Hiroshi Hasegawa, Ken-ichi Sato, “High-Throughput Optical Circuit Switch for Intra-Datacenter Networks Based on Spatial Super-Channels,” Optical Fiber Communication Conference 2020 (OFC 2020), W1F.2, 8?12 March 2020, San Diego.
Ryuta Shiraki, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Dynamically Controlled Flexible-Grid Networks Based on Semi-Flexible Spectrum Assignment and Network-State-Value Evaluation,” Optical Fiber Communication Conference 2020 (OFC 2020), M1B.4, 8?12 March 2020, San Diego.
Ryota Shiraki, Shuhei Yamaoka,Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Novel Network Architecture Enabling Quasi-Nyquist Wavelength-Division Multiplexing,” Photonic West, San Francisco, January 2019.
Ryota Hashimoto, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Verification of High Performance and Wide Applicability of Seamlessly Expandable and Limitless OXC,” Optical Networking and Communication Conference & Exhibition, OFC 2019, W2A.24, San Diego, 4-7 March 2019.
Ryota Shiraki, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Demonstration of Quasi-Nyquist WDM Networks Using Widely Deployed Wavelength-Selective Switches,” Optical Networking and Communication Conference & Exhibition, OFC 2019, M1.A7, San Diego, 4-7 March 2019.
Keisuke Itakura, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Design and Resiliency Enhancement in Coarse/Fine Hybrid Granular Routing Optical Networks based on Iterative Path-Pair-Loop Inflation,” 15th International Conference on the Design of Reliable Communication Networks (DRCN 2019), March 19-21, 2019, Coimbra, Portugal.
Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, "High-port-count optical cross-connect using single-module M×M wavelength-selective switches" Ise, Japan, International Symposium EXAT 2019, May 29-31, 2019. (Invited)
Hiroshi Hasegawa and Ken-ichi Sato, “Switching granularity and intra-node interconnection optimization for large scale optical nodes, “ OECC/PSC 2019, WA2-4 (invited),
Eiji Honda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Feasibility Test of Large-Scale (1,424×1,424) Optical Circuit Switches Utilizing Commercially Available Tunable Lasers,” OECC/PSC, WA1-3, Jul 8, 2019
Kazuya Okamura, Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato “Evaluation of WSS Characteristics in Highly Dense WDM Networks,” OECC/PSC, MF2-5, Jul 8, 2019.
Ken-ichi Sato, “How optical-circuit/electrical-packet hybrid switching will create high performance and cost-effective data center networks (Invited),” 21st International Conference on Transparent Optical Networks (ICTON) 2019, Th.D1.4, Angers, France, 9-13 July, 2019.
Ryuta Shiraki, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Dynamic Control of Transparent Optical Networks with Adaptive State-Value Assessment Enabled by Reinforcement Learning,” 21st International Conference on Transparent Optical Networks (ICTON) 2019, Sa.A3.4, Angers, France, 9-13 July, 2019.
Eiji Honda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Intra- and inter-datacentre converged networks utilising Kramers-Kkronig receivers,” 45th European Conference on Optical Communication (ECOC 2019), Th1.A.5., Dublin, Ireland, September 22-26.
Ken-ichi Sato, “Role of Optical Technologies to Compensate the End of Moore's Law,” The 2rd World Symposium on Communication Engineering (WSCE 2019), December 18-20, 2019, Nagoya Institute of Technology, Nagoya. (Invited)
Shuhei Yamaoka, Ryota Hashimoto, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Large-scale optical node architecture enabling spectral-efficiency maximization in ultra-dense WDM networks,” SPIE OPTO, Photonics West, Optical Metro Networks and Short-Haul Systems X, paper 10560-15, San Francisco, January 27-February 1, 2018.
Hiroki Nagai, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Demonstration of 153.6-Tbps Throughput from 1,536x1,536 Optical Switch with Uniform-Loss and Cyclic-Frequency AWGs,” SPIE OPTO, Optical Metro Networks and Short-Haul Systems X, Paper 10560-24, San Francisco, January 27-February 1, 2018. (SPIE Photonics West 2018, Optical Communications Best Paper Award)
Hiroshi Hasegawa, Takuma Yasuda, Yojiro Mori, and Ken-ichi Sato, “Fragmentation-Minimized Transponder Upgrading Employing Channel Bandwidth Aligned Slot Allocation in Flexible Grid Optical Networks,” OFC 2018, M3J.6, San Diego, March 11-15, 2018.
Yojiro Mori, Koh Ueda, Keijiro Suzuki, Hiroyuki Matsuura, Ken Tanizawa, Kazuhiro Ikeda, Shu Namiki, Hitoshi Kawashiwa, and Ken-ichi Sato “Next-Generation ROADM Employing Bandwidth-Adaptive Silicon-Photonic Filters for Flexible Drop Operation,” OFC 2018, Th3H.5, San Diego, March 11-15, 2018.
Yojiro Mori and Ken-ichi Sato, “Large-Scale Optical Circuit Switch Architecture for Intra-Datacenter Networking,” OFC 2018, Th3H.3, San Diego, March 11-15, 2018. (invited)
Keisuke Kayano, Hiroshi Saito, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Shoichiro Oda, Setsuo Yoshida, and Takeshi Hoshida, “Spectrally Efficient and Highly Resilient Grouped Routing Network Enhanced with Optical Performance Monitoring,” OFC 2018, M3J.8, San Diego, March 11-15, 2018.
Tomohiro Ishikawa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Spectral Utilization Efficient Coarse Granular Routing Optical Networks with Resiliency against Multiple Failures,” 14th International Conference on Design of Reliable Communication Networks, DRCN 2018, Paris, February 19, 2018.
Mungun-Erdene Ganbold, Takuma Yasuda, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Assessment of Optical Cross-Connect Architectures for the Creation of Next Generation Optical Networks,” 23rd OptoElectronics and Communications Conference (OECC2018), paper SC1_1037, Jeju, Korea, July 2 - 6, 2018.
Mungun-Erdene Ganbold, Hiroki Nagai, Yojiro Mori, Keijiro Suzuki, Hiroyuki Matsuura, Ken Tanizawa, Kazuhiro Ikeda, Shu Namiki, Hitoshi Kawashima, and Ken-ichi Sato, “1,024x1,024 Optical Circuit Switch Using Wavelength-Tunable and Bandwidth-Variable Silicon Photonic Filter,” Advanced Photonics 2018 Congress, NeTh1F.4, Zurich, Switzerland, 2-5 July 2018. (Best Student Paper for the OSA Advanced Photonics Congress 2018)
Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Novel Demodulation Algorithm Based on Duo-Binary Spectrum Shaping and MLSE for Mitigating Spectrum Narrowing Caused by Multiple Node Traversals,” Advanced Photonics 2018 Congress, SpW1G.5, Zurich, Switzerland, 2-5 July 2018.
Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Novel FM-Noise Spectrum Measurement Based on Three-Wave Interference,” CLEO Pacific Rim 2018 Conference, Hong Kong, 29 July? 03 August, 2018.
Mungun-Erdene Ganbold, Takuma Yasuda, Yojiro Mori, and Ken-ichi Sato, “Assessment of optical cross-connect architectures for the creation of next generation optical networks,” 23rd OptoElectronics and Communications Conference (OECC 2018), paper SC1_1037, Jeju, Korea, 2-6 July 2018.
Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Novel Demodulation Framework Based on Quadrature Duo-Binary/Quaternary/Octernary Spectrum Shaping and MLSE for Mitigating Spectrum NarrowingImpairment Caused by Node Traversals,” 44th European Conference on Optical Communication (ECOC 2018), Mo4F.5, Roma, Italy, September 23-27, 2018.
Yojiro Mori, Mungun-Erdene Ganbold, Ryuta Shiraki, Keijiro Suzuki, Hiroyuki Matsuura, Hitoshi Kawashima, Shu Namiki, Kazuhiro Ikeda, and Ken-ichi Sato, “Fast Optical Circuit Switch Using Monolithically Integrated Silicon-Photonic Space Switch and Wavelength-Tuneable Filter,” 44th European Conference on Optical Communication (ECOC 2018), Mo3H.4, Roma, Italy, September 23-27, 2018.
Ryota Shiraki, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Architecture and Design of Quasi-Nyquist WDM Networks with Flexible Grid Granular Switching,” The International Conference on Photonics in Switching and Computing ? PSC, Paper Fr3A.5, Cyprus, 19-21 September 2018.
Ken-ichi Sato, “Role of optical circuit switching and realization technologies for datacenter applications,” The International Conference on Photonics in Switching and Computing, Fast Switching Workshop, Cyprus, 19 September 2018.
Keisuke Kayano, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Fumikazu Inuzuka, Akira hirano “Ultra-Dense Elastic Optical Networks Enabled by Grouped Routing with Distance-Adaptive Modulation,” The International Conference on Photonics in Switching and Computing PSC, Paper Fr4B.2, Cyprus, 19-21 September 2018.
Takuma Yasuda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Network expansion strategy for elastic optical networks that considers channel capacity upgrades,” Photonic West, SPIE Proc. Vol. 10129, Optical Metro Networks and Short-Haul Systems IX, 1012909 (28 January 2017), San Francisco.
Keisuke Ito, Masaki Niwa, Koh Ueda, Yojiro Mori, Hiroshi Hasegawa and Ken-ichi Sato, “Impairment mitigation in non-coherent optical transmission enabled with machine learning for intra-datacenter networks,” Photonic West. Proc. SPIE 10131, Next-Generation Optical Networks for Data Centers and Short-Reach Links IV, 101310A (January 28, 2017), San Francisco.
Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Optical Tunable Filter for Gridless ROADM,” OSA The Optical Fiber Communication Conference and Exhibition (OFC), Tu3F.4, Los Angels, 19-23 March 2017.
Yusaku Ito, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Dynamic Control of Coarse/Fine Hybrid Granular Routing Optical Networks,” OSA The Optical Fiber Communication Conference and Exhibition (OFC), Th4F.3, Los Angels, 19-23 March 2017.
Shuhei Yamakami, Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Highly Reliable Large-Scale Optical Cross-Connect Architecture Utilizing MxM Wavelength-Selective Switches,” OSA The Optical Fiber Communication Conference and Exhibition (OFC), Th3K.5, Los Angels, 19-23 March 2017.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Novel Intra- and Inter-Datacenter Converged Network Exploiting Space- and Wavelength-Dimensional Switches,” OSA The Optical Fiber Communication Conference and Exhibition (OFC), M3K.2, Los Angels, 19-23 March 2017.
Yojiro Mori, Koh Ueda, Hiroshi Hasegawa, and Ken-ichi Sato, “Large-Scale Optical Circuit Switch Architecture for Intra-Datacentre Networking,” Conference on Lasers and Electro-Optics/Europe, CLEO-EU, CI-5.3, 25-29 June 2017, Munich, Germany.
Shuhei Yamaoka, Yojiro Mori, Ken-ichi Sato, “Novel laser-linewidth measurement based on three-wave interference using digital coherent receiver,” Conference on Lasers and Electro-Optics/Europe, CLEO-EU, CI-6.2, 25-29 June 2017, Munich, Germany.
Keijiro Suzuki, Ken Tanizawa,Satoshi Suda,Hiroyuki Matsuura, Kazuhiro Ikeda,Yojiro Mori, Ken-ichi Sato, Shu Namiki, and Hitoshi Kawashima, “Silicon photonics C-band tunable filter for large-scale optical circuit switches,” OECC 2017, P3-128, Singapore, 31 July-4 August 2017. (CLEO-PR, OECC & PGC 2017), s1263.
K. Sato, “Role of Grouped Routing in Creating Cost Effective and Bandwidth Abundant Networks,” ICTON 2017, Th.A1.5, Girona, Spain, July 2-6, 2017.
David Martinez, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Novel subcarrier multiplexing and subcarrier-synchronous phase estimation tolerant to laser phase noise,” OSA Advanced Photonics 2017 (IPR, NOMA, Sensors, Networks, SPPCom, PS), paper SpW1F.5, New Orleans, 24?27 July, 2017.
Hiroshi Hasegawa and Ken-ichi Sato, “Theory and progress of large-scale optical switching and elastically-hybrid optical switching,” OSA Advanced Photonics 2017, Photonics in Switching 2017, paper PM2D.1, New Orleans, 24-27 July 2017.
K. Sato, “Realization and application of large-scale fast optical circuit switch for data center networking,” 43rd European Conference on Optical Communication, ECOC 2017, Tu2F.1, Gothenburg, Sweden, 17-21 September 2017.
K. Sato, “Large scale switching devices and systems for datacenters," 43rd European Conference on Optical Communication, ECOC 2017, WS 3: Data Center Networks: Meeting the emerging requirements for capacity, cost, energy consumption and reach, Gothenburg, Sweden, 17-21 September 2017.
Ryota Hashimoto, Shuhei Yamaoka, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Keita Yamaguchi, Kazunori Seno, Kenya Suzuki, “First demonstration of subsystem-modular optical cross-connect using single-module 6x6 WSS,” 43rd European Conference on Optical Communication, ECOC 2017, Tu2F.2, Gothenburg, Sweden, 17-21 September 2017. (Highly ranked paper, shortlisted for student paper award, invited for JLT special issue)
Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Joint pre-, inline-, and post-compensation of spectrum narrowing caused by traversing cascaded multiple optical nodes,” 43rd European Conference on Optical Communication, ECOC 2017, P1.SC3.45, Gothenburg, Sweden, 17-21 September 2017.
Yusaku Ito, Y. Mori, H. Hasegawa, and K. Sato, “Architecture and design of optical path networks utilizing waveband virtual links,” SPIE Photonics West OPTO 2016, Proc. SPIE Proceedings 9773, Optical Metro Networks and Short-Haul Systems VIII, 97730J, San Francisco, 13-18 February 2016.
Hiroshi Kawase, Yojiro Moria, Hiroshi Hasegawaa, and Ken-ichi Sato, “Real-time optical path control method that utilizes multiple support vector machines for traffic prediction,” SPIE Photonics West OPTO 2016, Proc. SPIE 9773, 977318, San Francisco, 13-18 February 2016.
K. Ueda, Y. Mori, H. Hasegawa, H. Matsuura, K. Ishii, H. Kuwatsuka, S. Namiki, and K. Sato, “Demonstration of 720x720 optical fast circuit switch for intra-datacenter networks,” SPIE Photonics West OPTO 2016, San Francisco, 13-18 February 2016, Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750J (March 7, 2016); doi:10.1117/12.2211998.
T. Ishikawa, Y. Mori, H. Hasegawa, and K. Sato, “Spectrum utilization maximization in coarse granularity optical routing networks that employ high granularity shared protection,” IEEE 12th International Conference on Design of Reliable Communication Networks (DRCN), DRCN 2016, France, March 15-17, 2016.
H. Kawase, Y. Mori, H. Hasegawa, and K. Sato, “Cycle-slip-tolerant decision-boundary creation with machine learning,” 2016 IEEE 6th International Conference on Photonics (ICP), Malaysia, March 14-16, 2016.
K. Ueda, Y. Mori, H. Hasegawa, K. Sato, and O. Moriwaki, “Low-Loss and Large-Scale Optical Switch Utilizing Asymmetric-Port-Count Cyclic AWGs,” 2016 IEEE 6th International Conference on Photonics (ICP), Malaysia, March 14-16, 2016. (Best paper award)
Y. Terada, Y. Mori, H. Hasegawa, and K. Sato, “Highly spectral efficient elastic optical network employing grouped optical path routing,” OFC/NFOEC 2016, Th1I.6, Anaheim, March 20-24, 2016.
Kosuke Sato, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Algorithm for raising OXC port count to meet traffic growth at minimum-cost,” OFC/NFOEC 2016, W2A.48, Anaheim, March 20-24, 2016. Top rated systems/networking paper invited for the OSA/IEEE Journal of Optical Communications and Networking (JOCN).
Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Tipping point for the future scalable OXC -What size MxN WSS is needed?-,” OFC/NFOEC 2016, W4B.5, Anaheim, March 20-24, 2016. Top rated systems/networking paper invited for the OSA/IEEE Journal of Optical Communications and Networking (JOCN).
T. Ishikawa, H. Hasegawa, and K. Sato “A compact OXC node architecture that exploits dynamic path bundling and routing,” 2016 International Conference on Optical Network Design and Modeling (ONDM) 2016, Cartagena, 9-12 May 2016, pp. 1-6.
Ken-ichi Sato, “Impact of node/fiber/WSS degrees in creating cost effective OXCs,” The 18th International Conference on Transparent Optical Networks ICTON 2016, Trento, Italy, Th.B1.6, July 10-14, 2016.
Tomohiro Ishikawa, Yojiro Mori, Hiroshi Hasegawa, Suresh Subramaniam and Ken-ichi Sato “Hardware scale analysis and prototype development of flexible waveband routing OXCs,” OECC/PS 2016.
Yuki Terada, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Spectral Efficient grouped routing network that applies dynamic optical path grooming,” OECC/PS 2016, Niigata, paper TuA1-1, July2016.
K. Suzuki, K. Tanizawa, S. Suda, H. Matsuura, K. Ikeda, Y. Mori, K. Sato, S. Namiki, and H. Kawashima, “Polarization-independent C-band tunable filter based on cascaded Si-wire asymmetric Mach-Zehnder interferometer,” in 21st Optoelectronics and Communications Conference/ International Conference on Photonics in Switching Proceedings (online), OECC/PS 2016, Niigata, 2016, paper ME1-2.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Hiroyuki Matsuura, Kiyo Ishii, Haruhiko Kuwatsuka, Shu Namiki, Toshio Watanabe, and Ken-ichi Sato, “Demonstration of 1,440x1,440 fast optical circuit switch for datacenter networking,” OECC/PS 2016 (The 21st OptoElectronics and Communications Conference/International Conference on Photonics in Switching 2016), WF1-3, July 3-7, 2016, Niigata, Japan. (Best paper award)
Ken-ichi Sato, “Optical networking and node technologies for creating cost effective bandwidth abundant networks,” OECC/PS 2016 (The 21st OptoElectronics and Communications Conference/International Conference on Photonics in Switching 2016), ThA1-2, July 3-7, 2016, Niigata, Japan.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Recent progress in large-scale optical switches for intra-datacenter interconnection,” 2016 Progress in Electromagnetic Research Symposium (PIERS), Shanghai 8-11 Aug. 2016, pp. 2369- 2373.
Ken-ichi Sato, “How optical technologies can compensate the imminent demise of Moore's law?” 2016 IEEE 17th International Conference on High Performance Switching and Routing (HPSR 2016), Yokohama, June 14-17, 2016. (Keynote)
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Keijiro Suzuki, Hiroyuki Matsuura, Ken Tanizawa, Satoshi Suda, Kazuhiro Ikeda, Shu Namiki, Hitoshi Kawashima, Shigeru Nakamura, Shigeyuki Yanagimachi, Akio Tajima, and Ken-ichi Sato, “Large-scale optical circuit switch for intra-datacenter networking using silicon-photonic multicast switch and tunable filter,” 42nd European Conference and Exhibition on Optical Communication (ECOC 2016), W.2.F.2, Dusseldorf, September 18-22, 2016.
Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “MxM WSS based ROADM architecture with topology-insensitive routing performance,” 42nd European Conference and Exhibition on Optical Communication (ECOC 2016), W.4.P1.SC4.7, Dusseldorf, September 18-22, 2016.
Yusaku Ito, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Optical networking utilizing virtual direct links,” 42nd European Conference and Exhibition on Optical Communication (ECOC 2016), W.4.P1.SC6.3, Dusseldorf, September 18-22, 2016.
Yuma Isono, Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, “Spectral-efficiency maximization with subcarrier-multiplexed hybrid-QAM signals adaptive to distance and hop count,” 42nd European Conference and Exhibition on Optical Communication (ECOC 2016), Th.1.E.3, Dusseldorf, September 18-22, 2016.
Yojiro Mori, Koh Ueda, Keijiro Suzuki, Hiroyuki Matsuura, Ken Tanizawa, Satoshi Suda, Kazuhiro Ikeda, Shu Namiki, Hitoshi Kawashima, Shigeru Nakamura, Shigeyuki Yanagimachi, Akio Tajima, and Ken-ichi Sato, “Large-scale intra-datacenter switch using silicon-photonic multicast switches and tunable filters,” VICTORIES Symposium, Paper G-1, Akihabara, November 1, 2016.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Hiroyuki Matsuura, Kiyo Ishii, Haruhiko Kuwatsuka, Shu Namiki, and Ken-ichi Sato, “Experimental demonstration of 2,160x2,160 optical circuit switch for intra-datacenter networking,” 2016 Photonics Society Conference (IPC), MB4.2, Hawaii, October 2-6, 2016.
Shuhei Yamakami, Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Highly reliable and cost effective large scale optical cross-connect architecture,” 2016 Photonics Society Conference (IPC), WD2.4, Hawaii, October 2-6, 2016.
Yusaku Ito, Masaki Niwa, Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Demonstration of Virtual Direct Link Optical Networks,” 2016 Photonics Society Conference (IPC), WD1.5, Hawaii, October 2-6, 2016.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, and Toshio Watanabe, “Large-scale and simple-configuration optical switch enabled by asymmetric-port-count sub-switches,” 2016 Photonics Society Conference (IPC), the inverted conference submission, Hawaii, October 2-6, 2016.
Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Novel Optical-Node Architecture Utilizing Asymmetric-Multiport Wavelength-Selective Switches,” 2016 Photonics Society Conference (IPC), the inverted conference submission, Hawaii, October 2-6, 2016.
Ken-ichi Sato, “What are the keys to create flexible, scalable and cost-effective OXC/ROADM?” Asia Communications and Photonics Conference (ACP 2016), Workshop 8: Towards Next Generation Optical Networks: Evolution and Challenges, Wuhan, China, November 2, 2016.
Masaki Niwa, S. Takashina, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Wavelength-tunable filter utilizing non-cyclic arrayed waveguide grating to create colorless/directionless/contentionless ROADMs,” Proc. SPIE 9388, Optical Metro Networks and Short-Haul Systems VII, 938807, part of SPIE OPTO, San Francisco, 7-12 February, 2015.
Mauro M. Soares, H. Hasegawa, and K. Sato, ” A novel optical path routing network that combines coarse granularity optical multicast with fine granularity add/drop & block,” Proc. SPIE. 9388, Optical Metro Networks and Short-Haul Systems VII, 93880O, part of SPIE OPTO, San Francisco, 7-12 February, 2015.　
Y. Terada, Y. Mori, H. Hasegawa, and K. Sato, “Residual capacity aware dynamic control of GRE-based routing optical path networks under traffic growth model,” OFC/NFOEC 2015, Th1I.6, Los Angels, March 22-26, 2015.
H. Ishida, H. Hasegawa and K. Sato, “Highly Scalable subsystem modular OXC nodes that host tailored add/drop mechanism,” OFC/NFOEC 2015, Th2A.47, Los Angels, March 22-26, 2015.
class="border2"Z. Shen, H. Hasegawa and K. Sato, “A novel routing and frequency slot assignment scheme that can adapt to transmission speed migration,” OFC/NFOEC 2015, W1I.2, Los Angels, March 22-26, 2015.
K. Ueda, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Large-scale optical-switch prototype compactly implemented with novel functional configuration,” OFC/NFOEC 2015, W3D.1, Los Angels, March 22-26, 2015. (top scored)
S. Takashina, H. Ishida, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Demonstration of large-port-count and compact ROADM that exhibits virtual-C/D/C performance,” OFC/NFOEC 2015, W3J.6, Los Angels, March 22-26, 2015.
H. Hasegawa and K. Sato, “Large scale optical cross-connect: architecture, performance analysis, and feasibility demonstration,” OFC/NFOEC 2015, W3J.1, Los Angels, March 22-26, 2015.
H. Hasegawa, Y. Mori, and K. Sato, “Resilient grouped routing optical networks that adopt fine granular protection,” 19th International Conference on Optical Networks Design & Modeling, ONDM 2015, We7.3P, Pisa, Italy, May11-14, 2015.
H. Hasegawa, Suresh Subramaniam, and K. Sato, “Flexible waveband routing optical networks,” IEEE International Conference on Communications, ICC 2015, London, June 8-12, 2015, pp. 6816-6821.
Hiroshi Kawase, Hiroshi Hasegawa, and Ken-ichi Sato, “Router power reduction by active performance control realized with support vector machines,” ICNC'15, February 16-19, 2015 Anaheim.
Kiyo Ishii, Junya Kurumida, Ken-ichi Sato, Tomohiro Kudoh, and Shu Namiki, “Estimation of energy consumption of data communication network in Japan,” the 7th International Symposium on Ultrafast Photonic Technologies (ISUPT 2015), Extremely Advanced Transmission Technology (ISUPT/EXAT 2015), P-4, Kyoto, July 13-15.
Y. Tanaka, H. Hasegawa, and K. Sato, “Performance evaluation of subsystem modular OXCs with different subsystem connection configurations,” The 20th OptoElectronics and Communications Conference (OECC 2015), PWe.05, Shanghai, June 28th - July 2nd, 2015.
A. Kadohata, T. Tanaka, A. Watanabe, A. Hirano, H. Hasegawa, and K. Sato, “Path Accommodation Design and Reconfiguration for Different Reliable Classes in Virtualized Multi-layer Transport Network,” The 20th OptoElectronics and Communications Conference (OECC 2015), JTuB.24, Shanghai, June 28th - July 2nd, 2015.
K. Ueda, M. Niwa, Y. Mori, H. Hasegawa, K. Sato, T. Miyazawa, and H. Harai, “Experimental demonstration of multi-granular optical-path network that utilizes wavelength/waveband-selective switches,” The 20th OptoElectronics and Communications Conference (OECC 2015), JThB.15, Shanghai, June 28th - July 2nd, 2015.
K. Sato, “Key technologies to expand optical networking capabilities,” The International Conference on Transparent Optical Networks, ICTON 2015, We.D.3.2, Hungary, 5-9 July, 2015.
Takaya Miyazawa, Takahiro Hirayama, Hiroaki Harai, Koh Ueda, Yojiro Mori, Hiroshi Hasegawa and Ken-ichi Sato, “Wavelength path signalling for WSS/WBSS combined optical switches in hierarchical optical networks,” The International Conference on Transparent Optical Networks, ICTON 2015, Tu.B.3.5, Hungary, 5-9 July, 2015．
K. Sato, “Photonic networking technologies for inter- and intra- data centers,” Majorca at MIT Workshop, July 27-29, 2015, MIT, Cambridge.
T. Ishikawa, H. Hasegawa, and K. Sato, “Shared protected grouped optical path routing network design employing iterative path group relocation,” 2015 7th International Workshop on Reliable Networks Design and Modeling (RNDM), 5-7 Oct. 2015, Munich, Germany, pp. 78 ? 84.
Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio Watanabe, “Large-Scale Optical Switch with Simplified Sub-Switch Connections for Datacenter Application,” Photonics in Switching, FrIII2-2, Florence, September 22-25, 2015.
Yuki Terada, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Takafumi Tanaka, “Evaluation of Frequency Utilization Enhancement with Transmission-Characteristics-Aware Grouped Optical Path Routing,” Photonics in Switching, SC4-2, Florence, September 22-25, 2015.
Kosuke Sato, Hiroshi Hasegawa, and Ken-ichi Sato, “Cost Effective and Resilient Optical Network that Offers Seamless Network Expansion via Subsystem Modular OXCs and Inter-node Interconnection Optimization,” Photonics in Switching, WeIII3-3, Florence, September 22-25, 2015.
Ken-ich Sato, “Large Port Count Optical Switch Systems for Future Datacenters,” Photonics in Switching, FrII2-1, Florence, September 22-25, 2015.
Soubhik Deb, Hiroshi Hasegawa, Yojiro Mori, Ken-ichi Sato, “Impairment-aware Optical Multicast Tree Design with Modulation Format Optimization,” Photonics in Switching, SC4-1, Florence, September 22-25, 2015.
Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, “Highly Scalable and Compact ROADM Architecture that Exploits MxN Wavelength Selective Switches,” Photonics in Switching, WeII3-2, Florence, September 22-25, 2015.
Yuki Terada, Y. Mori, H. Hasegawa, and K. Sato, “Novel network control scheme that can substantially reduce link and node costs simultaneously,” The 41st European Conference on Optical Communication (ECOC 2015), Valencia, September 27th - October 1st, 2015. Paper ****.
Kiyo Ishii, Junya Kurumida, Ken-ichi Sato, Tomohiro Kudoh, and Shu Namiki, “Energy consumption of data communication network in Japan estimated with top-down and bottom-up approach,” International Symposium on VICTORIES 2015, Akihabara, November 10.
Hasegawa??, RNDN
K. Sato, “Development of large capacity future optical networks,” 10th International Workshop on Optical Signal Processing and Optical Switching, IWOO 2015, Beijing, China, November 15-17, 2015.
K. Sato, “How Can Optical Technologies Compensate the Imminent Demise of Moore’s Law?” 2015 IEIE Fall Conference, November 27-28, 2015, Oak Valley, Wonju-si, Korea, (Keynote).
Y. Tanaka, H. Hasegawa, and K. Sato, “Performance evaluations of large-scale OXC that achieves modular and hitless expansion,” OFC/NFOEC 2014, W2A.50, San Francisco, March 9-14, 2014.
S. Takashina, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Low crosstalk wavelength tunable filter that utilizes symmetric and asymmetric Mach-Zehnder interferometers,” OFC/NFOEC 2014, Th3F.6, San Francisco, March 9-14, 2014.
K. Takaha, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “A 204.8 Tbps throughput 64x64 optical cross-connect prototype that allows C/D/C add/drop,” OFC/NFOEC 2014, M2K.1, San Francisco, March 9-14, 2014. (Top Scored)
Y. Terada, Y. Mori, H. Hasegawa, and K. Sato, “Enhancement of fiber frequency utilization by employing grouped optical path routing,” OFC/NFOEC 2014, W1C.6, San Francisco, March 9-14, 2014.
H. Ishida, H. Hasegawa and K. Sato, “Hardware scale and performance evaluation of compact OXC add/drop architecture,” OFC/NFOEC 2014, W1C.7, San Francisco, March 9-14, 2014.
Y. Mori, H. Hasegawa, and K. Sato, “Fiber-nonlinearity limitation of transmission distances in ultra-dense gridless photonic networks,” OFC/NFOEC 2014, W2A.33, San Francisco, March 9-14, 2014.
Y. Mori and K. Sato, “Photonic networks that exploit digital coherent technologies,” Photonics West, paper 9008-1, San Francisco, February 1-6, 2014. (invited)
Z. Shen, H. Hasegawa, and K. Sato, “A novel flexible grid/semi-flexible grid optical path network design algorithm that reserves exclusive frequency slots for high bitrate signals,” IEEE Optical Network Design and Modelling conference, ONDM 2014, Stockholm, May 19-22, 2014, pp. 287-292.
A. Jirattigalachote, P. Monti, L. Wosinska, Y. Taniguchi, T. Ban, H. Hasegawa, and K. Sato, “Design of Grouped routing entity (GRE)-based optical networks with 100% signal quality guarantee,” IEEE Optical Network Design and Moedling conference, ONDM 2014, Stockholm, May 19-22, 2014, pp. 174-179.
K. Sato, “Implication of inter-node and intra-node contention in creating large throughput photonic networks,” IEEE Optical Network Design and Modeling conference, ONDM 2014, Stockholm, May 19-22, 2014, pp. 144-149. (invited).
L. H. Chau, H. Hasegawa and K. Sato, “Blocking performance of multi-stage routing optical path networks,” 19th OptoElectronics and Communication Conference and the 39th Australian Conference on Optical Fibre Technology (ACOFT), OECC/ACOFT 2014, TU6A-6, July 6-9, Melbourne, Australia, 2014.
Kousuke Sato, Hiroshi. Hasegawa and Ken-ichi. Sato, “Design of reliable optical path networks that consist of large scale subsystem-modular OXC nodes,” OptoElectronics and Communication Conference, OECC/AOTF 2014, July 6-9, Melbourne, Australia, 2014.
K. Sato, “How to create large scale OXCsROADMs for future networks,” 16th International Conference on Transparent Optical Networks, ICTON 2014, We.B1.4, Graz, Austria, July 6-10, 2014. (invited).
Z. Shen, H. Hasegawa, and K. Sato, “Disruption minimized spectrum defragmentation and equalization of bitrate dependent blocking in semi-flexible grid networks,” Photonics in Switching 2014, PS 2014, PW1B.2, San Diego, 13-17 July 2014.
K. Oka, H. Hasegawa, and K. Sato, “Dynamic control of optical path networks by utilizing adaptive wavelength grouping and link fiber selection,” Photonics in Switching 2014, PS 2014, San Diego, 13-17 July 2014.
K. Ueda, Y. Mori, H. Hasegawa, and K. Sato, “Optimum power-budget allocation for large-scale optical switches utilizing cyclic arrayed waveguide gratings,” Photonics in Switching 2014, PS 2014, San Diego, 13-17 July 2014.
S. Takashina, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Low-loss and low-power-consumption wavelength tunable filter enabling Colorless/Directionless/Contentionless optical drop in ROADMs,” ECOC 2014, We.3.5.2, Cannes, September 21-25, 2014.
K. Ueda, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe, “Novel large-port-count optical-switch architecture for optical interconnection in datacenter,” ECOC 2014, We.3.5.1, Cannes, September 21-25, 2014.
Y. Terada, Y. Mori, H. Hasegawa, and K. Sato, “Verification of high frequency spectrum utilization in grouped optical path routing networks under traffic growth scenario,” ECOC 2014, Mo.3.1.4, Cannes, September 21-25, 2014.
J. Kurumida, K. Ishii, A. Takefusa, Y. Tanimura, S. Yanagimachi, H. Takeshita, A. Tajima, K. Fukuchi, H. Honma, W. Odashima, H. Onaka, K. Tanizawa, K. Suzuki, S. Suda, K. Ikeda, H. Kawashima, H. Uetsuka, H. Matsuura, H. Kuwatsuka, K. Sato, T. Kudoh, S. Namiki, “First demonstration of ultra-low-energy hierarchical multi-granular optical path network dynamically controlled through NSI-CS for video related applications,” ECOC 2014, PD.1.3, Cannes, September 21-25, 2014.
Zhi-shu Shen, Hiroshi Hasegawa, and Ken-ichi Sato, “A novel semi-flexible grid network utilizing aligned frequency slot assignment,” The 7th International Symposium on VICTORIES Project & Workshop, WIN2 2014, Poster, P-4, Tsukuba, Ibaraki, October 8-10, 2014.
Kosuke Sato, Hiroshi Hasegawa, and Ken-ichi Sato, “Cost effective and reliable networking that utilizes subsystem modular OXC nodes,” The 7th International Symposium on VICTORIES Project & Workshop, WIN2 2014, Poster, P-3, Tsukuba, Ibaraki, October 8-10, 2014.
Ken-ichi Sato, “Role of optical switches in networks and datacenters,” The 7th International Symposium on VICTORIES Project & Workshop, WIN2 2014, Tsukuba, Ibaraki, October 8-10, 2014. (invited).
Ken-ichi Sato, “Large-scale optical switch architectures for intra-datacenter networks,” Asia Communications and Photonics Conference, ACP 2014, Workshop 7: Optical Datacentre Networks, Session 2, Shanghai, China, Nov. 11-14, 2014. (invited)
Z. Shen, H. Hasegawa, and K. Sato, “Impact of wavelength/waveband convertors and the cost bound in hierarchical optical path networks,” OFC/NFOEC 2013, OM3A.5, Anaheim, March 17-21, 2013.
Y. Iwai, H. Hasegawa, and K. Sato, “OXC hardware scale reduction attained by using interconnected subsystem architecture,” OFC/NFOEC 2013, NW1J.2, Anaheim, March 17-21, 2013. (Selected as a semi-finalist in the 2013 Corning Outstanding Student Paper Competition)
Y. Taniguchi, H. Hasegawa, and K. Sato,” Dynamic grouped routing optical networks for cost effective and agile wavelength services,” OFC/NFOEC 2013, OM3A.5, Anaheim, March 17-21, 2013.
T. Niwa, H. Hasegawa, and K. Sato, “A 270 x 270 optical cross-connect switch utilizing wavelength routing with cascaded AWGs,” OFC/NFOEC 2013, OTh1A.3, Anaheim, March 17-21, 2013. (Selected as a semi-finalist in the 2013 Corning Outstanding Student Paper Competition).
T. Niwa, H. Hasegawa, K. Sato, T. Watanabe, H. Takahashi, and S. Soma, “Compact integrated tunable filter utilizing AWG routing function and small switches,” OFC/NFOEC 2013, OW1C.2, Anaheim, March 17-21, 2013.
H. Hasegawa, Y. Taniguchi, K. Sato, A. Jirattigalachote, P. Monti, L. Wosinska, “Design strategies for survivable Grouped Routing Entity (GRE)-based optical networks,” 9th International Conference on the Design of Reliable Communication Networks (DRCN 2013), Budapest, Hungary, 4-7 March 2013, pp. 148 - 154.
L. H. Chau, H. Hasegawa and K. Sato, “Performance evaluation of large-scale OXC architectures that utilize intra-node routing restriction,” OECC/PS 2013, MQ2-2, Kyoto, June 30-July 4, 2013. (Best paper award)
T. Ban, L. H. Chau, H. Hasegawa and K. Sato, “Evaluation of hardware requirements for large-scale OXC architecture employing wavelength switching and fiber selection,” PS/OECC 2013, WT2-2, Kyoto, June 30-July 4, 2013.
K. Takaha, T. Ban, H. Hasegawa, K. Sato, H. Takahashi, and M. Okuno, “Development of ultra-compact 8x8 waveband cross-connect sub-system,” PS/OECC 2013, WT2-3, Kyoto, June 30-July 4, 2013.
K. Sato, “Challenges and opportunities of photonic networking technologies,” The 18th OptoElectronics and Communications Conference/Photonics in Switching 2013, PS/OECC 2013, WQ1-1, Kyoto, June 30-July 4, 2013. (invited)
L. H. Chau, H. Hasegawa and K. Sato, “Performance evaluations of large-scale OXCs that utilize multi-stage hetero-granular optical path switching,” ECOC 2013, Th.2.E.3, London, September 22-16, 2013.
Z. Shen, H. Hasegawa, K. Sato, T. Tanaka, and A. Hirano, “A novel semi-flexible grid optical path network that utilizes aligned frequency slot arrangement,” ECOC 2013, We.2.E.2, London, September 22-16, 2013. (Shortlisted for Student paper prize, Invited for Optics Express ECOC special issue)
Y. Tanaka, Y. Iwai, H. Hasegawa, and K. Sato, “Subsystem modular OXC architecture that achieves disruption free port count expansion,” ECOC 2013, Th.2.E.4, London, September 22-16, 2013.
K. Ishii, F. Okazaki, J. Kurumida, K. Mizutani, H. Takeshita, K. Kobayashi, D. Mochinaga, S. Namiki, K. Sato, and T. Kudoh, “Unified approach of top-down and bottom-up methods for estimating network energy consumption,” ECOC 2013, P.5.6, London, September 22-16, 2013.
H. Ishida, H. Hasegawa and K. Sato, “An efficient add/drop architecture for large-scale subsystem-modular OXC,” 15th International Conference on Transparent Optical Networks, ICTON 2013, We.A1.5, Cartagena, Spain, June 23-27, 2013.
K. Sato, “Prospects and development of large capacity future optical transport node,” 15th International Conference on Transparent Optical Networks, ICTON 2013, Tu.A1.1, Cartagena, Spain, June 23-27, 2013. (Invited)
L. H. Chau, H. Hasegawa and K. Sato, “A Comparison of large-scale selective switch-based optical cross-connects,” 2013 International Conference on Advanced Technologies for Communications (ATC 2013), October 16-18, Ho Chi Minh, Vietnam, 2013, pp. 55-59.
Y. Taniguchi, Y. Yamada, H. Hasegawa, and K. Sato, “A novel optical networking scheme utilizing coarse granular optical routing and fine granular add/drop,” OFCNFOEC 2012, JW2A.2, Los Angels, March 4-8, 2012.
Y. Yamada, R. Hirako, H. Hasegawa, and K. Sato, “Colorless/Directionless/Contentionless optical add/drop architecture applying waveband technologies and colorless MUX/DEMUX,” OFCNFOEC 2012, JTh2A.44, Los Angels, March 4-8, 2012.
F. Naruse, Y. Yamada, H. Hasegawa, and K. Sato, “Evaluations of different optical path add/drop ratio restriction schemes on oxc hardware scale and network resource requirement,” OFCNFOEC 2012, OTh1A.5, Los Angels, March 4-8, 2012.
T. Niwa, R. Hirako, H. Hasegawa, K. Sato, M. Okuno, and T. Watanabe, “Compact Wavelength Tunable Filter Fabricated on a PLC Chip that Realizes Colorless/Directionless/Contentionless Drop Function in Optical Cross-Connect,” OFCNFOEC 2012, OTh3D.6, Los Angels, March 4-8, 2012.
A. Jirattigalachote, Y. Yamada, C. Cavdar, P. Monti, L. Wosinska, H. Hasegawa, and K. Sato, “Impairment-Aware Routing and Waveband Assignment for Efficient Optical Transport Networks,” OFCNFOEC 2012, OWA3.2, Los Angels, March 4-8, 2012.
K. Sato, “Advances in optical networking technologies to create bandwidth abundant networks,” WOCC 2012 (2012 21st Annual Wireless and Optical Communications Conference), Kaohsiung, Taiwan, April 19-21, 2012. (invited)
K. Sato, “Optical technologies that create future green networks,” WIN2012 (What-Is-Next), a closed workshop of the AIST’s Vertically Integrated Center for Technologies of Optical Routing toward Ideal Energy Savings (VICTORIES project), p. 4, Inuyama, Aichi, June 28-29, 2012. (invited)
Y. Taniguti, Y. Yamada, H. Hasegawa, and K. Sato “Perfirmance of novel network that utilizes grouped optical path routing and fine granular add/drop,” WIN2012 (What-Is-Next), a closed workshop of the AIST’s Vertically Integrated Center for Technologies of Optical Routing toward Ideal Energy Savings (VICTORIES project), Poster, Inuyama, Aichi, June 28-29, 2012.
L. H. Chau, H. Hasegawa and K. Sato, “Hierarchical optical path networks utilizing elecgtrical grooming and regeneration of wavelength paths,” WIN2012 (What-Is-Next), a closed workshop of the AIST’s Vertically Integrated Center for Technologies of Optical Routing toward Ideal Energy Savings (VICTORIES project), p. 4, Inuyama, Aichi, June 28-29, 2012.
H. Hasegawa and K. Sato, “Design of bandwidth abundant photonic networks that utilize flexible/multi-granular optical path routing,” OECC 2012, 2012 17th Opto-Electronics and Communications Conference, 3A2-5, Busan, Korea, July 2-5, 2012. (invited)
K. Sato, “Optical technologies for future networks,” OECC 2012, 2012 17th Opto-Electronics and Communications Conference, Busan, Korea, 5A2-1, July 2-6, 2012. (invited)
K. Sato, “Role of electronics and optics in creating future transport networks,” 14th International Conference on Transparent Optical Networks, ICTON 2012, Mo.C1.2, Warwick, U.K., July 2-5, 2012. (invited)
L. H. Chau, H. Hasegawa and K. Sato, “Impact of optical transparent reach on the performance of translucent multi-granular optical path networks,” Proceedings of Fourth International Conference on Communications and Electronics (ICCE 2012), Vietnam, pp. 1-6, August 1-3, 2012.
L. H. Chau, Tien-Ban Nguyen, H. Hasegawa and K. Sato, “Performance evaluation of optical path networks utilizing waveband selective switch-based cross-connects,” 5th International Conference on Advanced Technologies for Communications (ATC 2012), 10-12 October, 2012, Hanoi, Vietnam.
Z. Shen, H. Hasegawa, and K. Sato, “Effectiveness of waveband conversion for hierarchical optical path networks and the allowable cost bound,” Photonics in Switching 2012 (PS 2012), Th-S34-O10, Corsica, September 11-14, 2012.
Y. Taniguchi, Y. Yamada, H. Hasegawa, and K. Sato,” Hardware scale reduction in large-port count OXCs exploiting selective switch based coarse granular routing,” Photonics in Switching 2012 (PS 2012), We-S31-O03, Corsica, September 11-14, 2012.
T. Niwa, H. Hasegawa, and K. Sato “Compact tunable filter realized with combination of wavelength routing and switch function,” Photonics in Switching 2012 (PS 2012), Th-S23-O06, Corsica, September 11-14, 2012.
L. H. Chau, H. Hasegawa and K. Sato, “A Large Capacity Optical Cross-connect Architecture Exploiting Multi-Granular Optical Path Routing,” Photonics in Switching 2012 (PS 2012), Fr-S26-O14, Corsica, September 11-14, 2012.
Y. Hachisuka, H. Hasegawa, and K. Sato, “Impairment-aware multicast tree design for hierarchical optical path networks,” Photonics in Switching 2012 (PS 2012), Th-S33-O08, Corsica, September 11-14, 2012.
K. Sato, “Optical transport network architecture; the future transport node technologies,” Photonics in Switching 2012 (PS 2012), Th-S33-I04, Corsica, September 11-14, 2012. (invited)
K. Sato, “Photonic technologies that create future green networks,” A Telecom & Energy Forum, Photonics in Switching 2012 (PS 2012), Corsica, September 13, 2012. (invited)
T. Ban, H. Hasegawa, K. Sato, T. Watanabe, and H. Takahashi, “A novel large-scale OXC architecture that employs wavelength path switching and fiber selection,” ECOC 2012, We.3.D.1, Amsterdam, September 16-20, 2012.
Y. Iwai, H. Hasegawa, and K. Sato, “Large-scale photonic node architecture that utilizes interconnected small scale optical cross-connect sub-systems,” ECOC 2012, We.3.D.3, Amsterdam, September 16-20, 2012.
S. Kosaka, H. Hasegawa, K. Sato, Y. Tanaka, A. Hirano, and M. Jinno, “Shared protected elastic optical path network design that applies iterative re-optimization based on resource utilization efficiency measures,” ECOC 2012, Tu.4.D.5, Amsterdam, September 16-20, 2012.
K. Sato, “Benefits of Elastic (Flexible) Optical Networks,” ECOC 2012 Workshop on Cognitive and Flexible Optical Networks, Amsterdam, September 16, 2012. (invited)
Y. Iwai, H. Hasegawa, and K. Sato, “Efficient routing strategies for interconnected small scale OXC sub-system networks,” ACP 2012, ATh2D.2, Guangzhou (Canton), China, November 7-10, 2012.
T. Ban, H. Hasegawa, and K. Sato, “Performance evaluation of large-scale OXC architecture employing wavelength path switching and fiber selection,” ACP 2012, ATh2D.4, Guangzhou (Canton), China, November 7-10, 2012.
K. Ishii, H. Hasegawa, and K. Sato, “Formulation of MUX/DEMUX functions for multiple input-output port cyclic AWG,” ACP 2012, AS4A.3, Guangzhou (Canton), China, November 7-10, 2012.
T. Niwa, H. Hasegawa, K. Sato, T. Watanabe, and H. Takahashi, “A novel large-scale wavelength routing switch configuration exploiting small arrayed waveguide gratings,” ACP 2012, ATh2C.4, Guangzhou (Canton), China, November 7-10, 2012.
N. Osawa, H. Hasegawa, and K. Sato, “Quasi-scheduled optical path routing and wavelength assignment that uses expected traffic variation,” ACP 2012, AS2D.4, Guangzhou (Canton), China, November 7-10, 2012.
L. H. Chau, H. Hasegawa and K. Sato, “Design of optical path networks employing large-capacity WSS/WBSS-Combined optical cross-connects,” ACP 2012, AF4A.49, Guangzhou (Canton), China, November 7-10, 2012.
K. Sato, “Photonic technologies for creating energy efficient networks,” ACP 2012 Workshop, “Energy Efficient Optical Communications and Networking,” Guangzhou (Canton), China, November 7-10, 2012. (invited)
S. Araki, K. Shimada, H. Hasegawa, K. Sato, Y. Iizawa, S. Ishida, I. Nishioka, “PCE-based scalable dynamic path control for large-scale photonic networks,” SPIE Photonics West 2011, Conference 7959: Optical Metro Networks and Short-Haul Systems III, Paper 7959-17, January 27, 2011.)
K. Sato, “OOO switching ?The role and technological advances,” OFCNFOEC 2011, NThB1, Los Angels, March 6-10, 2011 (invited).
L. H. Chau, H. Hasegawa and K. Sato, “Hybrid optical wdm networks utilizing optical waveband and electrical wavelength cross-connect,” OFC/NFOEC 2011, NMC3, Los Angels, March 6-10, 2011.
K. Noguchi, O. Moriwaki, H. Takahash, T. Sakamoto, M. Okuno, and K. Sato, “PLC-based compact optical cross-connect node for ROADM ring network connection,” OFCNFOEC 2011, NThB2, Los Angels, March 6-10, 2011.
Y. Yamada, H. Hasegawa, and K. Sato, “Novel hierarchical optical cross-connect architecture utilizing dedicated add/drop switches that effectively offer colorless and directionless capability,” OFCNFOEC 2011, OThR6, Los Angels, March 6-10, 2011.
T. Takagi, H. Hasegawa, K. Sato, Y. Sone, B. Kozichi, A. Hirano, and M. Jinno, “Dynamic routing and frequency slot assignment for elastic optical path networks that adopt distance adaptive modulation,” OFCNFOEC 2011, OTuI7, Los Angels, March 6-10, 2011.
F. Naruse, Y. Yamada, H. Hasegawa, and K. Sato, “Optical network design algorithms that consider optical path add/drop ratio restrictions for OXC hardware scale reduction,” OFCNFOEC 2011, NThC3, Los Angels, March 6-10, 2011.
R. Hirako, K. Ishii, H. Hasegawa, K. Sato, H. Takahashi, and M. Okuno, “Flexible and compact hierarchical optical cross-connect node with waveband add/drop restriction,” OFCNFOEC 2011, OTuE5, Los Angels, March 6-10, 2011.
K. Sato, “Role of optics in creating future transport networks,” 13th International Conference on Transparent Optical Networks, ICTON 2011, Stockholm, June 27-30, 2011 (invited).
K. Sato, “Photonic network technologies for the cloud era,” 16th Opto-Electronics and Communications Conference, OECC 2011, Workshop I, What photonic technology will play the leading role in the upcoming cloud era?, Kaohsiung, Taiwan, July 4-8 2011. (invited)
T. Ban, K. Ishii, H. Hasegawa, K. Sato, H. Takahashi, and M. Okuno, “Development of large capacity ultra-compact waveband cross-connect,” 16th Opto-Electronics and Communications Conference, OECC 2011, 6A1-2, Kaohsiung, Taiwan, July 4-8 2011.
R. Hirako, K. Ishii, H. Hasegawa, K. Sato, H. Takahashi, and M. Okuno, “Development of single plc-chip waveband selective switch that has extra ports for grooming and termination,” 16th Opto-Electronics and Communications Conference, OECC 2011, 7E1-4, Kaohsiung, Taiwan, July 4-8 2011.
K. Sato, “Recent developments in and challenges of elastic optical path networking,” ECOC 2011 - 37th European Conference and Exhibition on Optical Communication, Mo.2.K.1, Geneva, September 18-22, 2011. (invited)
L. H. Chau, H. Hasegawa and K. Sato, “Impact of electrical grooming and regeneration of wavelength paths in creating hierarchical optical path networks,” ECOC 2011 - 37th European Conference and Exhibition on Optical Communication, We.8.K.2, Geneva, September 18-22, 2011.
R. Hirako, K. Ishii, H. Hasegawa, K. Sato, H. Takahashi, and M. Okuno, “Compact hierarchical optical cross-connect utilizing newly designed waveband selective switch with extra ports for grooming,” ECOC 2011 - 37th European Conference and Exhibition on Optical Communication, Th.12.A.4, Geneva, September 18-22, 2011.
T. Takagi, H. Hasegawa, K. Sato, Y. Sone, A. Hirano, and M. Jinno, “Disruption minimized spectrum defragmentation in elastic optical path networks that adopt distance adaptive modulation,” ECOC 2011 - 37th European Conference and Exhibition on Optical Communication, Mo.2.K.3, Geneva, September 18-22, 2011.
H. Ohno, H. Hasegawa, K. Sato, “A dynamic path control method applying traffic-prediction-based route pre-prioritization,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), 8310-06, Shanghai, November 13-16, 2011.
Z. Shen, H. Hasegawa, and K. Sato, “Design of hierarchical optical path networks that utilize wavelength conversion and evaluation of the allowable cost bound,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), 8310-06, Shanghai, November 13-16, 2011. (NEDO) (Best Student Paper Award)
Y. Hachisuka, H. Hasegawa, and K. Sato, “Design algorithm of waveband multicast tree in hierarchical optical path networks that utilizes grouping of destination node sets,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), 8310-02, Shanghai, November 13-16, 2011.
S. Araki, H. Hasegawa, and K. Sato, “Multi-domain path control system for large-scale photonic networks,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), 8310-34, Shanghai, November 13-16, 2011.
K. Sato, “The path to fully flexible optical network,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), 8309-62, Shanghai, November 13-16, 2011. (invited)
K. Sato, “The role of multi-granular optical paths,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), 8310-01, Shanghai, November 13-16, 2011. (invited)
K. Sato, “Role of optical technologies to create future transport networks,” ACP 2011 (Asia Communications and Photonics Conference and Exhibition 2011), Workshop WK1: Spectrum- and Energy- Efficient Optical Transport Networks, Shanghai, November 13-16, 2011. (invited)
M. Sato, H. Hasegawa and K. Sato, “Efficient iterative design algorithm for enhancing resource utilization of shared protected optical path networks,” Proc. of the 2011 8th International Workshop on the Design of Reliable Communication Networks (DRCN), Krakow, Poland, October 10-12, 2011pp. 102-109.
H. Hasegawa and K. Sato, “Coarse granular routing optical networks for future optical services,” Proceedings of IWOO2011 (6th International Workshop on OPS & OCDMA), p.24, Dec.12-13, 2011, Okinawa, Japan. (invited).
K. Ishii, H. Hasegawa, K. Sato, "Impacts of waveband capacity and waveband add/drop ratio on the performance of ROADM-Ring connecting hierarchical optical path cross-connects," OFC/NFOEC 2010, NMD1, San Diego, March 21-25, 2010.
M. Nakagawa, H. Hasegawa, K. Sato, T. Takeda, and K. Shiomoto, “Adaptive self-reconfigurable network to create cost-effective bandwidth-on-demand services,” OFC/NFOEC 2010, NWA2, San Diego, March 21-25, 2010.
S. Mitsui, H. Hasegawa and K. Sato, S. Kamei, H. Takahashi, and M. Okuno, “Demonstration of compact hierarchical optical path cross-connect utilizing wavelength/waveband selective switches,” OFC/NFOEC 2010, NThF4, San Diego, March 21-25, 2010.
K. Sato, “Role and opportunities of photonics in future networks,” IEEE Photonics Society Winter Topicals 2010, Keynote, MC1.1, Majorca, Spain, January 11-13, 2010. (Invited)
K. Sato, “Next Generation Transport Network Architecture,” OFC/NFOEC 2010, invited, OWR1, San Diego, March 21-25, 2010.
K. Sato, “Are all optical network manageable?” OFC/NFOEC 2010, Workshop OMF, invited, San Diego, March 22, 2010.
O. Moriwaki, K. Noguchi, H. Takahashi, T. Sakamoto, K. Sato, H. Hasegawa, M. Okuno, and Y. Ohmori, “Terabit-scale compact hierarchical optical cross-connect system employing PLC devices and optical backplane,” OFC/NFOEC 2010, Post Deadline Paper, PDPC9, San Diego, March 25, 2010.
K. Sato, “Multi-granularity waveband- and wavelength- path network,” CLEO 2010, Conference on Lasers and Electro-Optics, CFJ1, San Hose, May16-21, 2010. (Invited)
T. Ogawa, Y. Yamada, H. Hasegawa, K. Sato, “Optical fast circuit switching networks applying waveband grooming,” COIN 2010 (9th International Conference on Optical Internet), July 11-14, 2010, Jeju, Korea.
K. Shimada, S. Araki, H. Hasegawa, and K. Sato, “A dynamic routing algorithm for multi-domain photonic networks using maximum flow information between domain boundaries,” COIN 2010 (9th International Conference on Optical Internet), July 11-14, 2010, Jeju, Korea.
K. Ishii, H. Hasegawa, K. Sato, M. Okuno, and H. Takahashi, "Performance test of ultra-compact waveband cross-connect module," COIN 2010 (9th International Conference on Optical Internet), July 11-14, 2010, Jeju, Korea.
K. Sato, “The path to energy efficient optical networking,” Photonics in Switching 2010, Plenary/Invited, JTuA2, Monterey, California, July 25-28, 2010.
K. Sato, “Optical technologies that enable Green networks,” 12th International Conference on Transparent Optical Networks, ICTON 2010, Mo.A.2, Munich, June 27-July 1, 2010. (Plenary/Invited)
H. Hasegawa and K. Sato, “Hierarchical optical path network design for future peta-bit class networks,” invited, OECC 2010, 9A4-1, Sapporo, Japan, July 5-9, 2010.
L. H. Chau, H. Hasegawa and K. Sato, “Cost evaluation of hybrid-hierarchical optical cross-connects based optical path network,” The Third International Conference on Communications and Electronics 2010, ICCE 2010, Nha Trang, Vietnam, August 11 ? 13, 2010.
Y. Yamada, H. Hasegawa, and K. Sato, “Coarse granular routing in optical path networks and impact of supplemental intermediate grooming,” ECOC 2010 - 36th European Conference and Exhibition on Optical Communication, Th.10.F.1, Torino, September 19-23, 2010.
R. Hirako, K. Ishii, H. Hasegawa, and K. Sato, “Development of compact hierarchical optical path cross-connect prototype utilizing integrated colorless multi/demultiplexers,” ECOC 2010 - 36th European Conference and Exhibition on Optical Communication, We.8.A.5, Torino, September 19-23, 2010.
T. Takagi, H. Hasegawa, K. Sato, T. Tanaka, Y. Sone, A. Watanabe, A. Hirano, B. Kozichi, T. Takara, and M. Jinno, “Algorithms for maximizing spectrum efficiency in elastic optical path networks that adopt distance adaptive modulation,” ECOC 2010 - 36th European Conference and Exhibition on Optical Communication, We.8.D.5, Torino, September 19-23, 2010.
K. Sato, “Role of optics and electronics in creating future broadband networks,” ECOC 2010, -36th European Conference and Exhibition on Optical Communication, We.6.F.2, Torino, September 19-23, 2010. (invited)
L. H. Chau, H. Hasegawa and K. Sato, “Hybrid hierarchical optical path network design algorithm applying a 2-stage ILP optimization,” Asia Communications and Photonics Conference and Exhibition 2010, ACP 2010, ThD3, Shanghai, December 9-11, 2010.
T. Oono, K. Ishii, H. Hasegawa, K. Sato, “Ring connecting node architecture employing variable filter,” Asia Communications and Photonics Conference and Exhibition 2010, ACP 2010, ThH4, Shanghai, December 9-11, 2010.
H. Ohno, H. Hasegawa, K. Sato, “A dynamic path control method applying traffic-prediction-based route pre-prioritization,” Asia Communications and Photonics Conference and Exhibition 2010, ACP 2010, FQ4, Shanghai, December 9-11, 2010.
H. Hirako, K. Ishii, H. Hasegawa, K. Sato, “Switch scale evaluation for optical cross-connects considering add/drop ratio restriction,” Asia Communications and Photonics Conference and Exhibition 2010, ACP 2010, ThH3, Shanghai, December 9-11, 2010.
K. Sato, “The future transport node technologies,” Asia Communications and Photonics Conference and Exhibition 2010, ACP 2010, SI1, Shanghai, December 9-11, 2010 (invited).
Y. Yamada, H. Hasegawa and K. Sato, “Survivable hierarchical optical path networks employing waveband and wavelength path protection,” OFC 2009, OWY3, San Diego, March 22-26, 2009.
K. Ishii, H. Hasegawa, K. Sato, M. Okuno, S. Kamei, and H. Takahashi, "An Ultra-compact Waveband Cross-connect Switch Module to Create Cost-effective Multi-degree Reconfigurable Optical Node," ECOC 2009 -35th European Conference on Optical Communication, Vienna, Austria, September 20-24, 2009, 4.2.2.
K. Ishii, O. Moriwaki, H. Hasegawa, K. Sato, Y. Jinnouchi, M. Okuno, and H. Takahashi, "Efficient ROADM-ring Connecting Node Switch Architecture that Utilizes Waveband Routing and its Realization with PLC Technologies," ECOC 2009 (35th European Conference on Optical Communication), Vienna, Austria, September 20-24, 2009, 5.3.1.
K. Ishii, H. Hasegawa, K. Sato, "Route and Wavelength/Waveband Assignment for Creation of Compact Hierarchical Optical Cross-Connect for Multi-Ring Connection," ECOC 2009 - 35th European Conference and Exhibition on Optical Communication, Vienna, Austria, September 20-24, 2009, 4.6.2.
K. Sato, “Future high-bandwidth demand services and network trend,” OECC 2009 (14th Optoelectronics and Communications Conference), Workshop, Hong Kong, July 13, 2009. (Invited)
K. Sato, “The Future optical network,” IEEE Photonics Society Summer Topicals 2009, Newport Beach, California, July 20-22, 2009. (Invited)
K. Sato, “Future directions of optical networking technology development ?Optical fast circuit switching and multilevel optical routing,” Photonics in Switching 2009, Pisa, Italy, September 16-19, 2009, WeII1-2. (Invited)
L. H. Chau, H. Hasegawa and K. Sato, “Hierarchical optical path network design algorithm that can best utilize WSS/WBSS based cross-connects,” Photonics in Switching 2009, Pisa, Italy, September 16-19, 2009, ThII2-3.
S. Mitsui, H. Hasegawa and K. Sato, “Low loss and cost-effective hierarchical optical path cross-connect switch architecture based on WSS/WBSS,” Photonics in Switching 2009, Pisa, Italy, September 16-19, 2009, FrII2-3.
R. Hirako, K. Ishii, H. Hasegawa, K. Sato, and O. Moriwaki, “Hierarchical optical cross-connect architecture that implements colorless waveband Add/Drop ratio restriction utilizing a novel wavelength multi/demultiplexers,” Photonics in Switching 2009, Pisa, Italy, September 16-19, 2009, FrII2-2.
H. Ito, H. Hasegawa, and K. Sato, “Impact of path granularity and operation interval on dynamic path network control,” ACP 2009 (Asia Communications and Photonics Conference and Exhibition 2009), November 2-6, 2009, Shanghai, China.
T. Ogawa, Y. Yamada, H. Hasegawa, K. Sato, “Evaluations on Physical and Optical Path Level Hierarchical Networks to Implement Optical Fast Circuit Switching,” ACP 2009 (Asia Communications and Photonics Conference and Exhibition 2009), November 2-6, 2009, Shanghai, China.
Y. Yamada, H. Hasegawa, and K. Sato, “Impact of waveband capacity on protected hierarchical optical path networks,” ACP 2009 (Asia Communications and Photonics Conference and Exhibition 2009), November 2-6, 2009, Shanghai, China.
K. Obara, H. Hasegawa, K. Sato, “A new multi-state route scheduling algorithm based on traffic prediction,” ONDM 2010 (14th Conference on Optical Network Design and Modeling), February 1?3, 2010, Kyoto, Japan.
K. Shimada, S. Araki, H. Hasegawa, and K. Sato, “A dynamic routing algorithm for multi-domain photonic networks using averaged link load information,” ACP 2009 (Asia Communications and Photonics Conference and Exhibition 2009), November 2-6, 2009, Shanghai, China.
O. Moriwaki, K. Suzuki, H. Takahashi, K. Sato, and S. Kakehashi, "8x8 wavelength router with transmission channel reallocation capability," OFC 2008, OWC5, San Diego, February 2008.
S. Kakehashi, H. Hasegawa, K. Sato, O. Moriwaki, "Interleaved waveband MUX/DEMUX developed on single arrayed-waveguide grating," OFC 2008, OThE1, San Diego, February 2008.
Y. Yamada, H. Hasegawa, K. Sato, "Cost comparisons for hierarchical and single-layer optical path networks considering waveband and wavelength path protection," OFC 2008, OThI4, San Diego, February 2008.
K. Sato, “Key enabling photonic network technologies for future networks,” The 17th Wireless and Optical Communications Conference, WOOC 2008, Taichung, Taiwan, April 23-24, 2008, pp. 81-82. (Invited)
S. Mitsui, H. Hasegawa and K. Sato, “Hierarchical optical path cross-connect node architecture using WSS/WBSS,” Photonics Switching 2008, S-04-1, Hokkaido, Japan, August 4-7, 2008.
K. Sato, “Future directions of networking technologies,” FISC 2008/AsiaFI (Future Internet Summer Camp 2008/First Asia Future Internet (AsiaFI) School on Architecture and Building Blocks), Jeju, Korea, August 25-29, 2008. (Invited)
T. Yamamoto, H. Hasegawa, and K. Sato,” Network segmentation and design algorithm for large-scale optical path networks based on traffic distribution information,” ECOC 2008, We.2.B.6, Brussels, September 22-25, 2008.
K. Ishii, H. Hasegawa, K. Sato, S. Kamei, H. Takahashi, and M. Okuno, “Monolithically Integrated Waveband Selective Switch Using Cyclic AWGs,” ECOC 2008, Mo.4.C.5, Brussels, September 22-25, 2008.
Y. Morita, H. Hasegawa, K. Sato, Y. Sone, K. Yamada, M. Jinno, “Optical Multicast Tree Construction Algorithm Considering SNR Constraint and 3R Regeneration,” ECOC 2008, We.3.A.4, Brussels, September 22-25, 2008.
K. Sato, “The future of optical networks,” ECOC 2008, We.3.A.1, Brussels, September 22-25, 2008. (invited)
K. Obara, H. Hasegawa, K. Sato, “Optical path dynamic routing algorithm based on traffic prediction,” APOC 2008 (Asia-Pacific Optical Communications), SPIE Conference 7137, Session 9a, Hangzhou, China, October 26?30, 2008.
Y. Yamada, H. Hasegawa and K. Sato, “Evaluation of network parameter dependencies of hierarchical optical path network cost considering waveband protection,” COIN 2008, Akihabara, Tokyo, October 14-16, 2008.
L. H. Chau, H. Hasegawa and K. Sato, “Hierarchical optical path network design algorithm considering waveband add/drop ratio constraint,” COIN 2008, Akihabara, Tokyo, October 14-16, 2008.
M. Nakagawa, H. Hasegawa, K. Sato, R. Sugiyama, T. Takeda, E. Oki, and K. Shiomoto, “Performance evaluation of dynamic network design for provisioning of broadband connection services,” COIN 2008, Akihabara, Tokyo, October 14-16, 2008.
K. Sato, “Advances in photonic networking technology and its impact on future networks,” APOC 2008 (Asia-Pacific Optical Communications), SPIE Conference 7137, Session 8a, Hangzhou, China, October 26?30, 2008. (Invited)
M. Nakagawa, H. Hasegawa, K. Sato, R. Sugiyama, T. Takeda, E. Oki, and K. Shiomoto, “New dynamic network design and provisioning algorithms for broadband connection services considering fairness,” ONDM 2009 (13th Conference on Optical Network Design and Modeling), Braunschweig, Germany, February 18-20, 2009, Paper #1569164809.
Moriwaki, K. Suzuki, H. Takahashi, Y. Sakai , K. Sato, and S. Kakehashi, "Loop-back AWG Router with Non-uniform Number of Transmission Paths," OFC 2007, JThA24, Anaheim, March 25-29, 2007.
K. Kanie, H. Hasegawa, and K. Sato, "Quasi-Dynamic Network Design Considering Different Service Holding/Contract Terms," OFC 2007. JThA65, Anaheim, March 25-29, 2007.
S. Kakehashi, H. Hasegawa, K. Sato, O. Moriwaki, S. Kamei, Y. Jinnouchi, and M. Okuno, "Waveband MUX/DEMUX Using Concatenated AWGs -Formulation of Waveguide Connection and Fabrication," OFC 2007, JThA94, Anaheim, March 25-29, 2007.
K. Sato, "Recent Developments in and Challenges of Photonic Networking Technologies," Plenary of COIN-ACOFT International Conference 2007, Melbourne, Australia, June 24-27, 2007.
H. Hasegawa, N. Matsusue, and K Sato, "Fast generation of orthogonal periodic polynomials and its application to smooth approximation of the Internet traffic," OECC/IOOC 2007, 13A2-3, Yokohama, July 9-13, 2007, pp. 540-541.
K. Sato, "Recent advances and challenges of multi-granular optical path networks," 2007 Japan-Italy Bilateral Workshop on Photonics for Communication, July 5-6, Osaka, Japan.
K. Sato, "Multi-granular optical path networking technologies," Photonics in Switching 2007, WA4.2, San Francisco, August 19-22, 2007.
K. Ishii, H. Hasegawa, and K. Sato, "Simple node architectures for connection of two ROADM rings using hierarchical optical path routing," Photonics in Switching 2007, TuA2.3, San Francisco, August 19-22, 2007.
S. Kakehashi, H. Hasegawa, K. Sato, O. Moriwaki, and M. Okuno, "Waveband selective switch using concatenated AWGs," ECOC 2007, Mo.2.5.3, Berlin, Germany, September 16-29, 2007.
Y. Yamada, H. Hasegawa, K. Sato, "Hierarchical optical path network design considering waveband protection," ECOC 2007, Tu.7.5.5, Berlin, Germany, September 16-29, 2007.
K. Ishii, H. Hasegawa, and K. Sato, "Simple node architectures for connection of ROADM rings," ECOC 2007, Th.2.5.3, Berlin, Germany, September 16-29, 2007.
N. Matsusue, H. Hasegawa and K Sato, "Suppression of Boundary Effect and Introduction of Scale Correlation for Wavelet based Traffic Prediction," IEEE International Workshop on Multimedia Signal Processing, MMSP 2007, Crete, Greece, October 1-3, 2007, pp. 438-440.
T. Yoshikawa, H. Nagashima, H. Hasegawa, and K. Sato, "An RWA algorithm for OBS networks based on iterative local optimization of total blocking probability," APOC 2007, Conference 6783-60, Wuhan, China, November 1-5, 2007.
K. Sato, "Prospects and challenges of hierarchical optical networks," APOC 2007, Conference 6783-01, Wuhan, China, November 1-5, 2007.
W. Imajuku, T. Ohara, R. Takeshima, T. Uyematsu, and K. Sato," Design of MPLS/GMPLS multilayer network considering protection and restoration," OFC 2006, OWQ6, Anaheim, March 5-10, 2006.
S. Kakehashi, H. Hasegawa, and K. Sato, "Optical switch architectures for hierarchical optical path networks," Proc. SPIE, vol. 6388, OpticsEast 2006, Boston, October 2-4, 2006, pp. 638809-1 - 638809-9.
S. Kakehashi, H. Hasegawa, K. Sato, and O. Moriwaki, "Waveband MUX/DEMUX Using Concatenated Arrayed-Waveguide Gratings," ECOC 2006, Cannes, September 24-28, 2006, We3.P.56.
Yagyu , H. Hasegawa, and K. Sato, "An Efficient Hierarchical Optical Path Network Design Algorithm based on a Traffic Demand Expression in a Cartesian Product Space," ECOC 2006, Cannes, September 24-28, 2006, Tu.3.6.6.
K. Sato, "Advances and challenges of IP plus photonic networks," OpticsEast 2006(ITCom2006), Boston, October 2-4, 2006.
class="border2"K. Sato, “Recent development and challenges of photonic networking technologies,” Asia-Pacific Optical Communications Conference, APOC2006, Gwangju, Korea, September 3-7, 2006.
K. Sato, "Development of hierarchical optical path network," KAIST International Workshop on "Harnessing Photonics for Future Applications," Seoul, Korea, September 2, 2006.
K. Sato, "Toward 100 Tera b/s router," Optical Network Testbeds Workshop 3 (ONT3), Tokyo, September 7-8, 2006.
K. Sato, "Advances and challenges of photonic networking technologies," Plenary of International Conference on Photonics in Switching 2006, Herakleion (Crete), Greece, October 16-18, 2006.
K. Sato, "Recent advances in photonic networking technologies," APRICOT 2005, Kyoto, Japan, February 21-24, 2005.
K. Sato, "Prospects and challenges of Broadband IP networks," Broadband World Forum Asia, Yokohama, 30 May ?2 June, 2005.
K. Sato, "Development of Broadband IP Networks in Japan," OECC 2005, Seoul July 5-8, 2005, pp. 12-13.
K. Sugimura, H. Hasegawa and K. Sato, "Segmented Network Design and Performance Evaluation for Large Scale Transparent OXC-based Networks," Proc. of SPIE, Vol. 6012, 60120C-1-9, OpticsEast2005(ITCom2005), Boston, October 23-26, 2005.
Koichi Kanie, Hiroshi Hasegawa, and Ken-ichi Sato, "Multi-layered Photonic Network Design Considering Incremental Traffic Growth and Different Service Contract Terms," ECOC 2005, Invited, Tu4.3.1, Glasgow, September 2005.
K. Sato, "Broadband Access and its Impact on Future Networks," OpticsEast2005(ITCom2005), Boston, Plenary Session, November 23-25, 2005.
K. Sato, “Photonic Switching Networks,” Asia-Pacific Optical Communications Conference, APOC2005, Workshops on All-Optical Routers and Switches for Next Generation Networks, Shanghai, China, November 6-10, 2005.
K. Asatani, K. Sato and H. Ishio, "Feasibility experiments on analog video transmission using a semiconductor laser diode," in Proc. 5th European Conf. Opt. Commun., Amsterdam, Sept. 17-19, 1979, Post Deadline Paper 16-8.
T. Matsumoto, K. Sato, I. Nakagawa and K. Hashimoto, "Estimation of bandwidths of long-distance graded-index fibers," Proc. 5th European Conf. Opt. Commun., Amsterdam, Sept. 17-19, 1979, 17.5.
K. Ohnishi and K. Sato, "Reflection-induced laser noise evaluation and its use in transmission system design", in Tech. Digest, Topical Meeting on Optical Fiber Communication, New Orleans, Louisiana, Feb. 28 - Mar. 2, 1983, pp. 68-69.
K. Sato, H. Nakada and Y. Sato, "Network delay analysis for universal transport network," Presented at IEEE COMSOC Int. Workshop on Future Prospects of Burst/Packetized Multimedia Commun., Nov. 22-24, 1987, Osaka, Japan.
T. Kanada, K. Sato and T. Tsuboi, "An ATM based transport network architecture," Presented at IEEE COMSOC Int. Workshop on Future Prospects of Burst/Packetized Multimedia Commun., Nov. 22-24, 1987, Osaka, Japan.
K. Sato, H. Nakada and Y. Sato, "Variable rate speech coding and network delay analysis for universal transport network," Proc. INFOCOM '88, New Orleans, March 27-31 1988, 8A.2.1-8A.2.10.
M. Sasagawa, K. Sato and I. Tokizawa, "A new transport network based on ATM techniques, -A Virtual Path concept-," Presented at the Workshop on Asynchronous Transfer Mode, Geneva, Switzerland, June 1988.
I. Tokizawa, T. Kanada and K. Sato, "A new transport network architecture based on Asynchronous Transfer Mode techniques," Proc. ISSLS '88, Boston, September 1988, 11.2.1-11.2.5.
S. Ohta, K. Sato and I. Tokizawa, "A dynamically controllable ATM transport network based on the Virtual Path concept," Proc. GLOBECOM 88, Nov. 28 - Dec. 1, 1988, Lauderdale, FL. USA, 39.2.1.-39.2.5.
K. Sato, S. Ohta and I. Tokizawa, "Dynamic reconfiguration of ATM-based network via Virtual Path strategy," Proceedings of the 2nd IEEE ComSoc International Workshop on Multimedia Communications, Ottawa, Canada, April 20-23, 1989, pp. 1-8.
I. Tokizawa and K. Sato, "Virtual path capabilities by ATM-based digital cross-connect systems," Presented at IEEE International Digital Cross-connect Workshop III, Banff, Canada, June 1989.
K. Sato and I. Tokizawa, "Flexible asynchronous transfer mode networks utilizing Virtual Paths," Proc. ICC '90, Atlanta, USA, April 16-19, 1990, 318.4.1.- 318.4.8.
H. Hadama, K. Sato and I. Tokizawa, "Dynamic bandwidth control of Virtual Paths in ATM networks," Presented at 3rd IEEE Int. Workshop on Multimedia Commun, MULTIMEDIA '90, Bordeaux, France, November 14-17, 1990.
K. Sato, H. Hadama and I. Tokizawa: "Network reliability enhancement with Virtual Path strategy," Proc. GLOBECOM '90, San Diego, Dec. 2-5, 1990, 403.5.1-403.5.6.
I. Tokizawa, and K. Sato, "Broadband transport techniques based on Virtual Paths," Proc. GLOBECOM '90, San Diego, Dec. 2-5, 1990, 705B.4.1-705B.4.5.
K. Sato and H. Ohnishi, "Migration Strategies to an ATM network," Compendium of Presentation, ComForum 90, Orlando, Florida, December 11-12 1990, D5-11 - D5-20.
N. Tokura, H. Obara and K. Sato, "High-speed ATM transport system experiment base on virtual path techniques," Proc. ISSLS '91, Amsterdam, April 1991, pp. 155-161.
K. Sato, R. Kawamura, and I. Tokizawa, "Introduction strategy of B-ISDN based on virtual paths," Proc. FORUM '91 (Technical Symposium of TELECOM 91), Geneva, Switzerland, October 10-15, 1991, Session 2.5, pp. 225-229.
Y. Sato, N. Yamanaka, K. Sato and N. Tokura, "Experimental ATM transport system and virtual path management techniques," Proc. GLOBECOM 91, Phoenix, Arizona, Dec. 2-5 1991, Session 59, 59.6.1-59.6.7.
R. Kawamura, K. Sato and I. Tokizawa, "Self-healing network techniques utilizing Virtual Paths," 5th Int. Network Planning Symposium, Networks '92, Kobe, Japan, May 17-22, 1992, pp. 129-134.
N. Yamanaka, Y. Sato and K. Sato, "Usage parameter control and bandwidth allocation methods for ATM-based B-ISDN," Presented at 4th IEEE COMSOC Int. Workshop, Multimedia '92, Monterey, April 1-4 1992, pp. 210-216.
R. Kawamura, K. Sato and I. Tokizawa, "Failed path restoration with distributed control scheme in ATM networks," Proc. IFIP/IEEE Int. Workshop on Distributed Systems: Operations & Management, Munich, Germany, October 12-13, 1992.
T. Aoyama, I. Tokizawa and K. Sato, "An ATM VP-based broadband network: its techniques and application to multimedia services," Proc. ISS '92, Yokohama, Japan, October 25-30, 1992, A1.3.
K. Sato and I. Tokizawa, "Broadband ISDN using ATM virtual path techniques," Proc. OFC/IOOC'93, San Jose, California, February 21-26, 1993, TuE2.
K. Sato, S. Okamoto and H. Hadama, "Optical path layer technologies to enhance B-ISDN performance," Proc. ICC '93, Geneva, 1993, vol. 3, pp. 1300-1307.
N. Yamanaka, T. Takenaka, Y. Sato and K. Sato, "Jitter tolerant usage parameter control method for ATM-based B-ISDN," Proc. 2nd Int. Conf. on Computer Communications and Networks (IC3N), San Diego, California USA, June 28-30, 1993, pp. 54-61.
S. Okamoto and K. Sato, "Optical path cross-connect systems for photonic transport network," Proc. GLOBECOM 93, Nov. 29-Dec. 2, 1993, Houston, pp. 474-480.
Y. Sato and K. Sato, "Comparison of traffic management schemes for ATM network," IEEE 18th Conference on Local Computer Networks, Minneapolis, Minnesota, September 19-22, 1993, pp. 397-402.
Y. Hamazumi, N. Nagatsu and K. Sato, "Number of Wavelengths Required for Optical Networks Considering Failure Restoration," Proc. OFC '94, San Jose, California, February 21-26, 1994, TuO4, pp67-68.
S. Okamoto, A. Watanabe and K. Sato, "Optical Path Cross-connect Node Architecture for Photonic Transport Networks," Proc. 7th Joint Conference on Communications, Networks and Switching Systems (JC-CNSS '94), Taejon, Korea, July 13-15, 1994, pp. 359-364.
K. Sato, "Transport Network Evolution with Optical Paths," Proc. ECOC '94, September 25-29, 1994, Italy, Florence, pp.919-926.
K. Sato, S. Okamoto and A. Watanabe, "Optical paths and realization technologies," Proc. GLOBECOM '94, San Francisco, Nov. 29-Dec. 2 1994, pp. 1513-1520.
S. Okamoto, N. Nagatsu, K. Oguchi and K. Sato, "Management concepts of optical path networks," First IEEE COMSOC Workshop on WDM Optical Network Management and Control, at ICC '95, Seattle, June 18 1995, Paper #3, pp. 19-26.
A. Watanabe, S. Okamoto, K. Sato and M. Okuno, "New Optical Path Cross-Connect Architectures Offering High Modularity," 2nd Asia-Pacific Conference on Communications, APCC '95, Osaka, Japan, June 13-16, 1995, pp. 89-92.
K. Sato, "Optical path network architecture and systems," Optical Networking Forum Workshop, Brussels, September 22, 1995, S1.3.
K. Sato, "Optical path network OA&M issues," Optical Networking Forum Workshop, Brussels, September 22, 1995, S3.2.
K. Sato and N. Nagatsu, "Failure restoration in photonic transport networks using optical paths," OFC '96, San Jose, February 25-March 1, 1996, pp.215-216.
K. Sato, "Optical path network OA&M technologies," 2nd International Workshop on Optical Networking, at OFC '96, San Jose, March 1, 1996, p.11.
M. Koga, A. Watanabe, S. Okamoto, K. Sato and M. Okuno, "8x16 delivery and coupling type optical switches for a 320 Giga-bit/s throughput optical path cross-connect system," OFC '96, San Jose, February 25-March 1, 1996, pp.259-261.
Y. Hamazumi, A. Watanabe, M. Koga, M. Ishii, S. Suzuki and K. Sato, "4x4 port optical path cross-connect transport experiments employing 8x2.5 Gb/s unequally spaced wavelength division multiplexing," OFC '96, San Jose, February 25-March 1, 1996, pp.263-264.
S. Okamoto, K. Oguchi and K. Sato, "Network architecture and management concepts for optical transport networks," IEEE NOMS '96, Kyoto, Japan, April 15-19, 1996, 3.1, pp. 1-11.
N. Nagatsu, S. Okamoto and K. Sato, "Optical path accommodation design considering failure restoration with minimum cross-connect system scale," IEEE NOMS '96, Kyoto, Japan, April 15-19, 1996, 10.1, pp. 213-224.
M. Koga, Y. Hamazumi, M. Teshima, A. Watanabe and K. Sato, "Performances of an optical path cross-connect system and its wavelength monitoring circuit," Proc. ICC '96, Dallas, June 23-27, 1996, pp. 1771-1777.
S. Okamoto, K. Oguchi and K. Sato, "Layered architecture of WDM networks employing optical paths," Second IEEE COMSOC Workshop on WDM Optical Network Management and Control, at ICC '96, Dallas, June 23 1996.
A. Watanabe, S. Okamoto, M. Koga, K. Sato and M. Okuno, "Packaging of 8x16 delivery and coupling switch for a 320 Gb/s throughput optical path cross-connect system," Proc. ECOC '96, September 15-19, 1996, Oslo, Norway, 4.111-4.114.
K. Sato, "Recent advances in photonic transport network technologies," Proc. ECOC '96, September 15-19, 1996, Oslo, Norway, TuB.1.4, 2.27-2.34.
M. Koga, A. Watanabe, S. Okamoto, K. Sato, H. Takahashi and M. Okuno, "Optical path cross-connect demonstrator designed to achieve 320 Gbit/s," ECOC '96, September 15-19, 1996, Oslo, Norway, Post-Deadline Paper ThC.3.1.
N. Nagatsu, S. Okamoto and K. Sato, "Large scale photonic transport network design based on optical paths," Proc. Globecom '96, November 18-22, 1996, London, pp. 321-327.
M. Koga and K. Sato, "Optical path cross-connect system," 2nd Optoelectronics and Communications Conference, OECC '97, Seoul, Korea, July 8-11, 1997, 9A1-2, pp. 80-81.
K. Sato, "Multimedia communication and its impact on photonic networking," Digest of the LEOS Summer Topical Meetings, Montreal, Canada, 11-15 August 1997, MB2.
S. Okamoto and K. Sato, "Inter-network interface for photonic transport networks and SDH transport networks," Proc. Globecom '97, November 3-8, 1997, Phoenix, Arizona, pp. 850-855.
O. Ishida, N. Takachio and K. Sato, "Modular cross-connect system for WDM optical-path networks," ECOC '97, Edinburgh, UK, September 22-25, 1997, pp. 63-66.
K. Sato, “Introduction strategy of photonic network technologies to create bandwidth-abundant multimedia networks,” Technical Digest of OFC '98, San Jose, 22-27 February 1998, TuQ3, pp. 95-96.
K. Sato, "Multimedia services and photonic network technologies," Workshop Note, ICC '98 Workshop on Management of Multiwavelength Optical Networks, Atlanta, June 7, 1998.
N. Nagatsu, A. Watanabe, S. Okamoto and K. Sato, "Performance and Node Architecture of WDM Multiple Fiber Ring Networks," Proc. ICC '98, Atlanta, June 7-11, 1998, S26-6, pp. 931-936.
S. Okamoto, A. Watanabe, N. Nagatsu and K. Sato, "Network performance and OA&M mechanism for WDM optical path transport networks," Proc. ICC '98, Atlanta, June 7-11, 1998, S6-6, pp. 207-212.
A. Watanabe, S. Okamoto, K. Kawai and K. Sato, "WDM optical path-based IP backbone network and optical path termination circuit, "Third Optoelectronics and Communications Conference, OECC '98, Chiba, Japan, June 13-16, 1998, Post Deadline Paper PD1-5.
Y. Hamazumi, M. Koga and K. Sato, "Large scale photonic transport system and supervision scheme," Third Optoelectronics and Communications Conference, OECC '98, Chiba, Japan, June 13-16, 1998.
K. Sato, "Optical networking and applications," GLOBECOM '98 Workshop WK01, Optical Networking: Applications and Services, Sydney, Australia, November 8, 1998.
H. Ichino, K. Kawai, S. Okamoto, M. Koga and K. Sato, "Low-power small-size Gbit/s interface technologies for robust photonic transport networks," GLOBECOM '98, Sydney, Australia, 8-12 November 1998, pp. 1012-1017.
Y. Hamazumi, M. Koga, K. Kawai, H. Ichino and K. Sato, "Optical path fault management in layered networks," GLOBECOM '98, Sydney, Australia, 8-12 November 1998, pp. 2300-2314.
K. Sato, "Photonic network research activities and testbed experiments in NTT," OFC '99, San Diego, February 21-26, 1999, ThP1-1, pp. 228-230.
A. Watanabe, S. Okamoto and K. Sato, "WDM optical path-based IP backbone network," OFC '99, San Diego, February 21-26, 1999, TuF1-1, pp. 56-58.
N. Nagatsu, S. Okamoto, M. Koga and K. Sato, "Large-scale and highly-meshed WDM ring networks using flexible OADM," ECOC'99.
K. Sato, “Photonic transport network based on WDM technologies,” The Royal Society Discussion Meeting -Network Modeling in the 21st Century-, December 6-7, 1999, London.
K. Sato, "Photonic transport network testbed -fault/degradation management-," OFC '2000, Baltimore, March 5-10, 2000, TuQ2, pp. 239.
A. Watanabe, S. Okamoto, T. Kawai, M. Koga, K. Sato, K. Kawai, O. Ishida and H. Ichino," Photonic transport network testbed of NTT," ECOC '2000, Munich, September 3-7, 2000, pp. 81-84.
K. Sato, "Direction of photonic transport network development," ECOC' 2000 Workshop on The Optical layer for Data Networking, September 3, 2000, Munich.
H. Takara, T. Ohara, K. Mori, K. Sato, E. Yamada, K. Jinguji, T. Inoue, T. Shibata, T. Morioka, and K-I Sato, "Over 1000 channel optical frequency chain generation from a single supercontinuum source with 12.5 GHz channel spacing for DWDM and frequency standards," ECOC' 2000 Post deadline paper PD-3.1, September 3-7, 2000, Munich.
K. Sato, "Recent advances in photonic networking technologies," Technical Digest, Fourth International Topical Workshop on Contemporary Photonic Technologies, CPT 2001, January 15-17, 2000, Tokyo, pp. 29-30.
K. Sato, "Advances in transport network technologies -SDH, ATM, and photonic networks-," Joint 4th IEEE International Conference on ATM(ICATM'01) and High Speed Intelligent Internet Symposium, April 22-25, 2001, Seoul, Korea, pp. 17.
F. Kano, T. Kawai, Y. Takigawa and K. Sato, "Development of photonic router (256x256 OLSPs) to develop next generation network with MPLambdaS control," NFOEC '2001, Baltimore, MD, July 8-12, 2001, pp. 468-454.
K. Shimano, A. Imaoka, Y. Takigawa and K. Sato, "MPLambdaS demonstration employing photonic routers (256x256 OLSPs) to integrate optical and IP networks," NFOEC '2001, Baltimore, MD, July 8-12, 2001, pp. 5-13.
K. Shimano, Y. Takigawa, M. Koga, and K. Sato, "Development of photonic MPLS router," ECOC '2001, Amsterdam, Sept. 30-Oct. 4, 2001, Tu.F.2.2, pp. 148-149.
K. Sato, "Making light work of the future IP network," Workshop on High Performance Switching and Routing 2002 (HPSR 2002), Kobe, Japan, May 26-29, 2002, pp. 4.
S. Kaneda, T. Uyematsu, N Nagatsu, and K. Sato, "Network dimensioning of electrical/optical label switched multi-Layer photonic IP networks," 7th European Conference on Networks & Optical Communications, NOC 2002, Darmstadt, Germany, June 18-21, 2002.
M. Koga and K. Sato, "Recent Advances in Photonic Networking Technologies," COIN+PS 2002, Cheju, Cheju Island, Korea July 21 - 25, 2002.
K. Sato, "Progress in photonic transport systems," Proc. SPIE (The International Society of Optical Engineering), vol. 4872, ITCom 2002, 29-31 July, 2002, Boston, pp. 148-159.　
K. Shimano, A. Sahara, M. Koga, Y. Takigawa and K. Sato, "Demonstration of fast restoration for distributed control plane on photonic network," ECOC '2002, Copenhagen, Sept. 8-12, 2002, paper 7.4.2.
K. Sato, "Key enabling optical technologies for future networks," Proc. OFC 2003, WH1, pp. 353-355, Atlanta, March 23-28, 2003.
K. Sato, "What will promote the introduction of 40 Gb/s transmission technologies?" ECOC 2003, We2.1.2, Rimini, Italy, September 21-25, 2003.
K. Sato, "The optical path to the future IP networks," International Conference on Communication and Broadband Networking, ICBN '2004, Kobe, Japan, April 7-9, 2004.
K. Sato, "The optical path to the future networks," Conference on Optoelectronics and Optical Communications, COOC 2004, Plenary talk, Daejon, Korea, May 12-14, 2004.
K. Sato, "Prospects and Challenges of Photonic IP Networks," APOC 2004 (Asia-Pacific Optical Communications Conference), Beijing, China, Nov. 7 - 11, 2004, pp. 382-390.

Books

K. Sato and K. Asatani, "Fiber optic analog video transmission using semiconductor laser diodes," in Japan Annual Reviews in Electronics, Computers & Telecommunications ---- Optical Devices & Fibers 1982-------, North-Holland Publishing Co., 1982 (ISSN: 0167-50036)
Broadband ISDN and ATM Technologies: Institute of Electronics, Information and Communication Engineers of JAPAN edit, co-author, February 1995 (ISBN 4-88552-127-0). (in Japanese)
K. Sato, Advances in Transport Network Technologies: Photonic networks, ATM, and SDH, Artech House, Norwood, 1996, (ISBN 0-89006-851-8).
Multimedia Communication Networks: Technologies and Services, Chapter 6: Trunk Transport Network Architectures and Technologies for Multimedia Services, Artech House, 1998 (ISBN 0-89006-936-0).
Science of Lasers, (Co-author) Maruzen Publishing Co.,1997 (ISBN: 4-621-04371-4).
Optical Communication Technologies Handbook, (Co-author) Corona Publishing Co., Tokyo, Chapter 4.3: Photonic Transport Network Technologies, 2003 (ISBN: 4-339-00754-4). (in Japanese)
Optical Communication Engineering (2), (Co-author) Corona Publishing Co., Tokyo, vol. 2, Chapter 8.1: Photonic Transport Network, 1998 (ISBN: 4-339-01144-4). (in Japanese)
Encyclopedia Electronics, Information and Communications Handbook, (Co-author) Ohmsha Publishing Co., Tokyo, 1998 (ISBN: 4-274-03514-X).
Optical Communication Technologies Handbook, (Co-author) Optronics Publishing Co., Tokyo, 2002 (ISBN: 4-900474-91-6). (in Japanese)
Broadband Photonic Networking Technologies , K. Sato edit, Institute of Electronics, Information and Communication Engineers of JAPAN, 2003 (ISBN: 4-88552-193-9). (in Japanese)
WDM Technologies: Optical Networks, Edited by K. Dutta, N. K. Dutta and M. Fujiwawa, A volume in the Optics and Photonics Series, Chapter 3: Optical Path Cross-Connect, Elsevier Inc., San Diego, USA (ISBN: 0-12-225263-2).
Encyclopedia on Optical Technologies, (Co-author) Optronics Publishing Co., Tokyo, 2004 (ISBN: 4-902312-08-5). (in Japanese)
Frontier of Studies on Optical Science, Japan Intense Light Field Science Society Edited, (Co-author), 2005 (ISBN: 4-902590-01-8) (in Japanese).
Encyclopedia of Information Technologies for Information Systems, (Co-author) Baifukan Publishing Co., Tokyo, 2006 (ISBN: 4-563-01560-1) (in Japanese).
Frontiers in Optical Science 2, Japan Intense Light Field Science Society Edited, V-2-1. Photonic Network, (Co-author), 2009 (ISBN: 978-4-902590-13-5) (in Japanese).
Information Networks, Editor and co-author, Ohmsha Publishing Co., Tokyo, 2012 (ISBN: 978-4-274-21120-1).
Introduction to Information Network Science (Co-author, Chapter 7; Information Network and Energy Consumption), Editors: Masayuki Murata and Makoto Naruse, Corona Publishing Co., Tokyo, 2015, (ISBN 978-4-339-02801-0).
Elastic Optical Networks, Architectures, Technologies, and Control, (Co-author, Chapter 6; Node Architectures for Elastic and Flexible Optical Networks), Editors: Victor Lopez and Velasco Luis, Springer International Publishing, 2016, (ISBN 978-3-319-30173-0)).

Honors

1984, the Young Engineer Award from the IEICE (Institute of Electronics, Information and Communication Engineers) of JAPANfor contributions to the elucidation of noise characteristics in optical fiber transmission systems employing laser diodes and multimode fibers.
1989, NTT Transmission Systems Laboratory Director Award for the invention of Virtual Path concept and studies on the transport systems based on the concept
1990, the Excellent Paper Award from the IEICE of JAPAN for a paper, “Architecture of the integrated services broadband transport network using Virtual Path concept,” authored by Ken-ichi Sato, Satoru Ohta, Ikuo Tokizawa, Vol.J72-B1, No.11, pp. 904-1916 November 1989.
1991, NTT Transmission Systems Laboratory Director Award for his contributions to the design principles of Virtual Path networks.
1991, the NTT R&D Award for his contribution to ATM network architecture and system technology development.
1995, the NTT President Award for his contribution to ATM network system development and its introduction.
1996, NTT Photonic Network Systems Laboratory President Award for his contribution to optical path networks.
1999, IEEE Fellow Award: For contributions to the architecture and technologies of Asynchronous Transfer Mode networks and photonic networks.
2004, NTT R&D Fellow Awards, for his contributions and leadership in research and development of telecommunication network technologies.
2000, the Achievement Award from the IEICE of JAPAN for his contribution to pioneering works on photonic transport network research and development
2002, Commendation by the Minister of Education, Culture, Sports, Science and Technology for his contribution to photonic transport network technologies development
2003, IEICE Fellow Awards for contributions to the ATM transport network and photonic network technology development.
2005, IEICE Communications Society, Praise for distinguished services for leading and managing Photonic Networking technical group
2007, IEICE Communications Society Best Tutorial Paper Awards: Recent developments in and challenges of photonic networking technologies
2007, IEICE Communications Society Best Tutorial Paper Awards: Prospects and challenges of multi-layer optical networks
2009, ONDM 2009 (The 13th International Conference on Optical Networking Design and Modeling - ONDM 2009) Best Paper Award, for the paper, New dynamic network design and provisioning algorithms for broadband connection services considering fairness
2012, IEICE Distinguished Achievement and Contributions Award
2013, CLEO-PR & OECC/PS 2013, The 10th Conference on Lasers and Electro-Optics Pacific Rim, and The 18th OptoElectronics and Communications Conference/Photonics in Switching 2013, Best Paper Award, to the paper “Performance evaluation of large-scale OXC architectures that utilize intra-node routing restriction,” authored by L. H. Chau, H. Hasegawa and K. Sato, MQ2-2, Kyoto, June 30-July 4, 2013.
2014, the Medal of Honor with Purple Ribbon from Japan’s Cabinet Office, April 29, 2014.
2016 IEEE 6th International Conference on Photonics (ICP 2016), Best Paper Award, to the paper, “Low-Loss and Large-Scale Optical Switch Utilizing Asymmetric-Port-Count Cyclic AWGs,” authored by K. Ueda, Y. Mori, H. Hasegawa, and K. Sato, Malaysia, March 14-16, 2016.
OECC/PS 2016 (The 21st OptoElectronics and Communications Conference/International Conference on Photonics in Switching 2016) Best Paper Award, to the paper, “Demonstration of 1,440x1,440 fast optical circuit switch for datacenter networking,” authored by Koh Ueda, Yojiro Mori, Hiroshi Hasegawa, Hiroyuki Matsuura, Kiyo Ishii, Haruhiko Kuwatsuka, Shu Namiki, Toshio Watanabe, and Ken-ichi Sato, July 3-7, 2016, Niigata, Japan.
2017, IEEE Communications Society, Optical Networking Technology Committee, 2017 Outstanding Technical Achievement Award, For contributions to Photonic Systems and Transport Networks
2018, SPIE Photonics West 2018, Optical Communications Best Paper Award, for an outstanding paper on, “Demonstration of 153.6-Tbps throughput from 1,536x1,536 optical switch with uniform-loss and cyclic-frequency AWGs,” Paper 10560-24, by Hiroki Nagai, Yojiro Mori, Hiroshi Hasegawa, and Ken-ichi Sato, San Francisco, January 27 ? February 1, 2018.
2019, Honorary Member, the Institute of Electronics, Information and Communication Engineers (IEICE).
2020, IEICE Best Paper Award, to the paper, “Improved Optical Amplification Efficiency by Using Turbo Cladding Pumping Scheme for Multicore Fiber Optical Networks,” authored by Hitoshi Takeshita, Keiichi Matsumoto, Hiroshi Hasegawa, Ken-ichi Sato, Emmanuel Le Taillandier de Gabory, Vol.E102-B, No.8, pp. 1579-1589, August 2019.

Inside NTT Honors

1989, NTT Transmission System Laboratory principal award
1991, NTT Transmission System Laboratory principal award
1991, the NTT R&D Award for his contribution to ATM network architecture and system technology development
1992, NTT Transmission System Laboratory principal award
1995, the NTT President Award for his contribution to ATM network system development and its introduction
2004, NTT R&D Fellow Awards, for his contributions and leadership in research and development of telecommunication network technologies