Academic Journal

2025

• Deep-depth probability-maintained notch enabling nonlinear distortion measurement for various modulation formats
  J. Li, T. Ye, X. Su, Y. Fan, K. Zhang, S. Shi, H. Nakashima, T. Hoshida, Z. Tao, Y. Mori, and H. Hasegawa
  IEEE/Optica Journal of Lightwave Technology, vol. 43, no. 10, pp. 4722-4730, May 2025.
• Three-stage optical circuit switch architectures for intra-datacenter networking
  T. Mitsuya, R. Higuchi, T. Kuno, T. Ochiai, H. Yuasa, Y. Mori, H. Hasegawa
  IEEE/Optica Journal of Lightwave Technology, vol. 43, no. 2, pp. 400-407, January 2025.

2024

• Digital coherent receiver enabling Nyquist wavelength demultiplexing under frequency offset and receiver-side IQ impairments
  T. Kuno, Y. Mori, and H. Hasegawa
  IEEE/Optica Journal of Lightwave Technology, vol. 42, no. 5, pp. 1409-1422, March 2024.
• Demonstration of spectrum narrowing mitigation based on recurrent neural networks for ultra-dense WDM networks
  R. Shiraki, Y. Mori, and H. Hasegawa
  Optica Optics Letters, vol. 49, no. 4, pp. 947-950, February 2024.
• Demodulation framework based on machine learning for unrepeated transmission systems
  R. Shiraki, Y. Mori, and H. Hasegawa
  IEICE Transactions on Communications, vol. E107.B no. 1, pp. 39-48, January 2024.

2023

• Architecture and performance evaluation of fiber-granularity routing networks with supplemental grooming by wavelength conversion
  T. Matsuo, R. Shiraki, Y. Mori, and H. Hasegawa
  IEEE/Optica Journal of Optical Communications and Networking, vol. 15, no. 8, pp. 541-552, August 2023.
• Cost-effective network capacity upgrade by heterogeneous WDM-density with bandwidth-variable virtual direct links
  K. Hayashi, Y. Mori, and H. Hasegawa
  IEEE/Optica Journal of Optical Communications and Networking, vol. 15, no. 9, pp. D23-D32, August 2023.

2022

• RNN-based demodulation framework for spectrum narrowing in ultra-dense WDM networks
  R. Shiraki, Y. Mori, and H. Hasegawa
  IEEE Photonics Technology Letters, vol. 34, no. 18, pp. 993-996, September 2022.
• Design and evaluation of a reconfigurable optical add-drop multiplexer with flexible wave-band routing in SDM networks
  T. Kuno, Y. Mori, S. Subramaniam, M. Jinno, and H. Hasegawa
  IEEE/Optica Journal of Optical Communications and Networking, vol. 14, no. 4, pp. 248-256, April 2022. Telecom System Technology Student Award

2021

• Fragmentation-minimized periodic network-bandwidth expansion employing aligned channel slot allocation in flexible grid optical networks
  H. Hasegawa, T. Yasuda, Y. Mori, and K. Sato
  IEICE Transactions on Communications, vol. E104B, no. 12, pp. 1514-1523, December 2021.
• Design and verification of LO bank enabled by fixed-wavelength lasers and fast tunable silicon ring filters for creating large scale optical switches
  R. Matsumoto, R. Konoike, H. Matsuura, K. Suzuki, T. Inoue, Y. Mori, K. Ikeda, S. Namiki, and K. Sato
  Optica Optics Express, vol. 29, no. 24, pp. 39930-39945, November 2021.
• Design and control of highly spectrally efficient photonic networks enabled by fiber-granular routing on overlaid ring-shaped topologies
  R. Shiraki, Y. Mori, H. Hasegawa, K. Sato, and P. Monti
  IEEE/Optica Journal of Optical Communications and Networking, vol. 13, no. 11, pp. 233-243, November 2021.
• High-port-count optical circuit switches for intra-datacenter networks [Invited Tutorial]
  Y. Mori and K. Sato
  IEEE/OSA Journal of Optical Communications and Networking, vol. 13, no. 8, pp. D43-D52, August 2021. Invited Tutorial Paper
• Pre-filtering techniques for spectrum narrowing caused by optical node traversal in ultra-dense WDM networks
  K. Okamura, Y. Mori, and H. Hasegawa
  IEEE Photonics Journal, vol. 13, no. 2, Article No. 7200513, April 2021.
• Scalable and fast optical circuit switch based on colorless coherent detection: Design principle and experimental demonstration
  R. Matsumoto, T. Inoue, R. Konoike, H. Matsuura, K. Suzuki, Y. Mori, K. Ikeda, S. Namiki, and K. Sato
  IEEE/OSA Journal of Lightwave Technology, vol. 39, no. 8, pp. 2263-2274, April 2021. Telecom System Technology Award

2020

• Assessment of optical node architectures for building next generation large bandwidth networks
  M. Ganbold, T. Yasuda, Y. Mori, H. Hasegawa, F. Inuzuka, A. Hirano, and K. Sato
  IEICE Transactions on Communications, vol. E103-B, no. 6, pp. 679-689, June 2020.
• Transmission-quality-aware online network design and provisioning enabled by optical performance monitoring
  K. Kayano, Y. Mori, H. Hasegawa, K. Sato, S. Oda, S. Yoshida, and T. Hoshida
  IEICE Transactions on Communications, vol. E103-B, no.6, pp.670-678, June 2020.
• Design of seamlessly and limitlessly expandable OXC and verification tests on its versatile applicability
  R. Hashimoto, Y. Mori, H. Hasegawa, and K. Sato
  IEEE/OSA Journal of Optical Communications and Networking, vol. 12, no. 5, pp. 99-108, May 2020.
• Wavelength-division demultiplexing enhanced by silicon-photonic tunable filters in ultra-wideband optical-path networks
  Y. Mori, E. Honda, R. Shiraki, K. Suzuki, H. Matsuura, H. Kawashima, S. Namiki, K. Ikeda, and K. Sato
  IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 5, pp. 1002-1009, March 2020.
• Architecture and design of coarse/fine hybrid granular routing optical networks
  Y. Ito, Y. Mori, H. Hasegawa, and K. Sato
  IEICE Transactions on Communications, vol. E103.B, no.2, pp. 118-129, February 2020.

2019

• Design and evaluation of quasi-Nyquist WDM networks utilizing widely deployed wavelength-selective switches
  R. Shiraki, Y. Mori, H. Hasegawa, and K. Sato
  OSA Optics Express, vol. 27, no 13, pp. 18549-18560, June 2019. Telecom System Technology Student Award
• Assessment of node- and link- level blocking and creating cost-effective networks in the era of large bandwidth services
  S. Yamakami, Y. Mori, H. Hasegawa, K. Sato, F. Inuzuka, and A. Hirano
  IEICE Transactions on Communications, vol. E102.B, no. 3, pp. 510-521, March 2019.
• Digital post-processing against inline spectrum narrowing caused by optical node traversals
  S. Yamaoka, Y. Mori, H. Hasegawa, and K. Sato
  IEICE Communications Express, vol. 8, no. 4, pp. 93-98, January 2019.
• Highly dense elastic optical networks enabled by grouped routing with distance-adaptive modulation
  K. Kayano, S. Yamaoka, Y. Mori, H. Hasegawa, and K. Sato
  IEEE Photonics Technology Letters, vol. 31, no. 4, pp. 295-298, January 2019.
• Design and evaluation of optical circuit switches for intra-datacenter networking
  Y. Mori, M. Ganbold, and K. Sato
  IEEE/OSA Journal of Lightwave Technology, vol. 37, no. 2, pp. 330-337, January 2019. Invited Paper
• Effectiveness of transmission-quality-aware online network design and provisioning enabled through optical performance monitoring
  K. Kayano, Y. Mori, H. Hasegawa, K. Sato, S. Oda, S. Yoshida, and T. Hoshida
  IEICE Communications Express, vol. 8, no. 4, pp. 81-86, January 2019.

2018

• A large-scale optical circuit switch using fast wavelength-tunable and bandwidth-variable filters
  M. Ganbold, H. Nagai, Y. Mori, K. Suzuki, H. Matsuura, K. Tanizawa, K. Ikeda, S. Namiki, H. Kawashima, and K. Sato
  IEEE Photonics Technology Letters, vol. 30, no. 16, pp. 1439-1442, August 2018.
• Design and verification of large-scale optical circuit switch using ULCF AWGs for datacenter application
  H. Nagai, Y. Mori, H. Hasegawa, and K. Sato
  IEEE/OSA Journal of Optical Communications and Networking, vol. 10, no. 7, pp. B82-B89, July 2018.
• First demonstration of subsystem-modular optical cross-connect using single-module 6 × 6 wavelength-selective switch
  R. Hashimoto, S. Yamaoka, Y. Mori, H. Hasegawa, K. Sato, K. Yamaguchi, K. Seno, and K. Suzuki
  IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 7, pp. 1435-1442, April 2018. Invited Paper

2017

• Fast optical circuit switch for intra-datacenter networking
  K. Ueda, Y. Mori, H. Hasegawa, H. Matsuura, K. Ishii, H. Kuwatsuka, S. Namiki, T. Watanabe, and K. Sato
  IEICE Transactions on Communications, vol. E100-B, no. 10, pp. 1740-1746, October 2017. Invited Paper
• Spectral efficiency maximization of grouped routing optical networks with shared protection
  T. Ishikawa, Y. Mori, H. Hasegawa, and K. Sato
  IEEE/OSA Journal of Optical Communications and Networking, vol. 9, no. 10, pp. 864-875, October 2017.
• Large-scale optical node utilizing MxM WSSs optimally configured for traffic distribution
  M. Niwa, Y. Mori, H. Hasegawa, and K. Sato
  IEEE Photonics Technology Letters, vol. 29, no. pp. 1293-1296, August 2017.
• Highly reliable and large-scale subsystem-modular optical cross-connect
  S. Yamakami, Y. Mori, H. Hasegawa, and K. Sato
  OSA Optics Express, vol. 25, no. 15, pp. 17982-17994, July 2017.
• Compact OXC architecture, design and prototype development for flexible waveband routing optical networks
  T. Ishikawa, Y. Mori, H. Hasegawa, S. Subramaniam, K. Sato, and O. Moriwaki
  OSA Optics Express, vol. 25, no. 14, pp. 15838-15853, July 2017.
• Algorithm for raising OXC port count to meet traffic growth at minimum cost
  K. Sato, Y. Mori, H. Hasegawa, and K. Sato
  IEEE/OSA Journal of Optical Communications and Networking, vol. 9, no. 2, pp. A263-A270, February 2017. Highly Ranked Paper
• Tipping point for the future scalable OXC: what size MxM WSS is needed?
  M. Niwa, Y. Mori, H. Hasegawa, and K. Sato
  IEEE/OSA Journal of Optical Communications and Networking, vol. 9, no. 1, pp. A18-A25, February 2017. Highly Ranked Paper
• Large-scale optical switch utilizing multistage cyclic arrayed-waveguide gratings for intra-datacenter interconnection
  K. Ueda, Y. Mori, H. Hasegawa, and K. Sato
  IEEE Photonics Journal, vol. 9, no. 1, Article No. 7800412, February 2017.

2016

• Dynamic router performance control utilizing support vector machines for energy consumption reduction
  H. Kawase, Y. Mori, H. Hasegawa, and K. Sato
  IEEE Transactions on Network and Service Management, vol. 13, no. 4, pp. 860-870, December 2016.
• Survivable grouped routing optical networks with dedicated path protection
  H. Hasegawa, Y. Mori, and K. Sato
  IEICE Transactions on Communications, vol. E99-B, no. 7, pp.1435-1444, July 2016.
• Highly spectral efficient networks based on grouped optical path routing
  Y. Terada, Y. Mori, H. Hasegawa, and K. Sato
  OSA Optics Express, vol. 24, no. 6, pp. 6213-6228, March 2016.
• Large-scale and simple-configuration optical switch enabled by asymmetric-port-count subswitches
  K. Ueda, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe
  IEEE Photonics Journal, vol. 8, no. 2, Article No. 0601610, March 2016.
• Novel optical-node architecture utilizing asymmetric-multiport wavelength-selective switches
  M. Niwa, Y. Mori, H. Hasegawa, and K. Sato
  IEEE Photonics Journal, vol. 8, no. 2, Article No. 0601210, March 2016.
• Large-scale optical-switch prototypes utilizing cyclic arrayed-waveguide gratings for datacenters
  K. Ueda, Y. Mori, H. Hasegawa, and K. Sato
  IEEE/OSA Journal of Lightwave Technology, vol. 34, no. 2, pp. 608-617, January 2016.

2015

• 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
  S. Takashina, H. Ishida, M. Niwa, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe
  OSA Optics Express, vol. 23, no. 11, pp. 14796-14805, May 2015.
• Wavelength-tunable filters utilizing arrayed waveguide gratings for colorless/directionless/contentionless optical signal drop in ROADMs
  S. Takashina, Y. Mori, H. Hasegawa, K. Sato, and T. Watanabe
  IEEE Photonics Journal, vol. 7, no. 1, Article No. 7100511, February 2015.

2014

• In-band estimation of optical signal-to-noise ratio from equalized signals in digital coherent receivers
  Md. S. Faruk, Y. Mori, and K. Kikuchi
  IEEE Photonics Journal, vol. 6, no. 1, Article No. 7800109, February 2014.

2012

• Novel configuration of finite-impulse-response filters tolerant to carrier-phase fluctuations in digital coherent receivers for higher-order quadrature amplitude modulation signals
  Y. Mori, C. Zhang, and K. Kikuchi
  OSA Optics Express, vol. 20, no. 24, pp. 26236-26251, November 2012.

2010

• Multi-impairment monitoring from adaptive finite-impulse-response filters in a digital coherent receiver
  Md. S. Faruk, Y. M ori, C. Zhang, K. Katoh, and K. Kikuchi
  OSA Optics Express, vol. 18, no. 26, pp. 26929-26936, December 2010.

2009

• Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver
  Y. Mori, C. Zhang, K. Igarashi, K. Katoh, and K. Kikuchi
  OSA Optics Express, vol. 17, no. 3, pp. 1435-1441, February 2009.
• Ultrafast operation of digital coherent receivers using their time-division demultiplexing function
  C. Zhang, Y. Mori, K. Igarashi, K. Katoh, and K. Kikuchi
  IEEE/OSA Journal of Lightwave Technology, vol. 27, no. 3, pp. 224-232, February 2009.