Publications

2021.01.11

2026

Press release

NTT [JP] 「世界初、光ネットワーク全長を“診る”機能を通信用デジタル信号処理チップへ搭載～専用測定器なしで光トランシーバが“自ら異常を見つける”時代へ～」

Webinar

GÉANT Infoshare “Advanced Fibre Sensing Techniques and Monitoring Systems”

Journal articles

JOCN
(Invited Tutorial)		 H. Nishizawa, K. Anazawa, T. Inui, T. Mano, T. Sasai, G. Borraccini, T. Matsumura, H. Ishihara, S. Kojima, Y. Sone, and K. Takasugi,
“Leveraging Digital Twin Technologies: All-Photonics Networks-as-a-Service for Data Center Xchange in the Era of AI [Invited Tutorial],”
Journal of Optical Communications and Networking, 2026.
IEEE Comm. Mag. T. Mano, H. Nishizawa, T. Sasai, S. Usui, D. Briantcev, D. Dass, B. Bashaw, E. Kenny, M. Ruffini, Y. Sone, K. Takasugi, and D. Kilper,
“Beyond Redundancy: Toward Agile Resilience in Optical Networks Powered by Digital Twins and AI,”
IEEE Communications Magazine, 2026.

Conferences

OFC
(Post-deadline paper)		 T. Sasai, Y. Nakajima, M. Takahashi, R. Kaneko, M. Nakamura, A. Matsushita, F. Hamaoka, E. Yamazaki
“First Coherent DSP and Pluggable Transceiver Capable of Distance-Resolved, Longitudinal Power Monitoring,”
Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, Th4B.4, 2026.
OFC
(Invited)		 T. Sasai,
“DSP-based Longitudinal Power Monitoring and its Applications to Network operations,”
in the panel session “Optical Sensing as a Service on Transceiver and Fiber Systems: Catering to More than just Telecom Industry,” Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, 2026.
OFC
(Workshop organizer)		 Takeo Sasai, Alan Pak Tao Lau, Ming-Fang Huang, Annika Dochhan, Darli A. Mello,
“Workshop: Toward Holistic Network and Environment Visibility: Are Fiber Sensing and Tomography Ready to Deliver in Real Networks?,”
Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, 2026.
OFC
(Top-scored)		 M. Takahashi, T. Sasai, M. Hoshi, M. Nakamura, A. Kawai, K. Shibahara, T. Kobayashi, Y. Miyamoto, E. Yamazaki,
“Mode-Resolved Longitudinal Power and MDL Monitoring in Multi-Mode Fiber Transmission,”
Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, Tu2A.5, 2026.
OFC
(Top-scored)		 A. Raj, V. V. Garbhapu, H. Ishihara, P. Pahlevanzadeh, H. Nishizawa, T. Sasai, D. Kilper, M. Ruffini
“OSNR/GSNR Prediction in Brownfield Links via a DLM-Anchored Hybrid Physics/ML Model,”
Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, M4A.5, 2026.
OFC T. Sasai and E. Yamazaki,
“Closed-Form Expression for Spatial Correlation Function of Nonlinear Fiber Propagation and Its Applications to Longitudinal Power Monitoring,”
Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, Tu3A.5, 2026.
OFC R. Kaneko, T. Sasai, E. Yamazaki,
“Optimal Spatial Step Size in Longitudinal Power Monitoring,”
Optical Fiber Communications Conference and Exhibition (OFC) 2026, Los Angeles, USA, W2A.52, 2026.

Domestic Conferences (Japan)

OITDA
(Invited)		 笹井健生,
“光伝送システムの長手方向パワープロファイル推定の最近の進展,”
一般社団法人 光産業技術振興協会, 第155回 光通信技術委員会 フォトニックネットワーク専門委員会, 2026年3月.

2025

Press release

NTT [EN] “Achieving Automated 1Tbps-Class Optical Network Configuration in IOWN APN Based on Open Standards —Demonstrating instant on-demand optical wavelength circuit provisioning at OFC2025—”[JP] 「オープン仕様に基づくIOWN APNにおいて1Tbps級光ネットワークの自動設定を実現～光波長回線をオンデマンドに即時に提供する技術をOFC2025で実演～」

Journal articles

JLT F. Hamaoka, K. Kimura, M. Nakamura, T. Sasai, T. Kobayashi, Y. Miyamoto, and E. Yamazaki,
“100-Tb/s-class Long-haul Transmission in Triple-band WDM with Forward- and Backward-pumped Distributed Raman Amplifications,”
Journal of Lightwave Technology, 2025 (early access).
JLT T. Sasai, G. Borraccini, Y. K. Huang, H. Nishizawa, Z. Wang, T. Chen, Y. Sone, M. Takahashi, T. Matsumura, M. Nakamura, E. Yamazaki, K. Takasugi, T. Wang, and Y. Kisaka,
“Optical Link Tomography: First Field Trial and 4D Extension,”
Journal of Lightwave Technology, 43(24), 2025
JLT M. Takahashi, T. Sasai, M. Nakamura and E. Yamazaki,
“Comprehensive Analysis of Longitudinal Power Monitoring in Various Fiber Types,”
Journal of Lightwave Technology, 43(23), pp.10478-10487, 2025.
JLT T. Sasai, S. Y. Set, and S. Yamashita,
“Design of Fiber-Longitudinal Optical Power Monitor,”
Journal of Lightwave Technology, 43(5), pp. 2192-2202, 2025.
JLT K. Suzuki, M. Ota, Y. Morimoto, K. Yamaguchi, O. Moriwaki, F. Hamaoka, S. Sugawara, T. Sasai, T. Kobayashi, M. Nakamura, Y. Miyamoto, S. Katayose, T. Umeki, D. Ogawa, M. Takeshita, M. Fukutoku, Y. Ma, S. Camatel,
“Multi-granular switching node and enabling devices,”
Journal of Lightwave Technology, 43(4), pp. 1678-1689 2025.
JLT F. Hamaoka, M. Nakamura, T. Sasai, S. Sugawara, T. Kobayashi, Y. Miyamoto, and E. Yamazaki,
“Long-Haul >100-Tb/s Transmission over >1000 km with High-Symbol-Rate Triple-Band WDM Signals,”
Journal of Lightwave Technology, 43(4), pp. 1987-1994, 2025.

Conferences

IPC
(Invited)		 T. Sasai,
“Optical Link Tomography for Advanced Network Monitoring and its Applications,”
IEEE Photonics Conferece (IPC) 2025, Signapore, 2026.
ECOC
(Post-deadline paper)		 T. Sasai, M. Takahashi, F. Hamaoka, M. Nakamura, S. Sugawara, S. Yamamoto, H. Nishizawa, Y. Sone, and E. Yamazaki,
“Tens-of-Metre Resolution Longitudinal Power Monitoring over 302-km Fibre Link,”
European Conference on Optical Communication (ECOC) 2025, Copenhagen, Denmark, 2025.
ECOC
(Upgraded invited)		 T. Sasai, K. Anazawa, D. Briantcev, D. Dass, S. Ali, G. Borraccini, Y. Kobatake, H. Ishihara, E. Kenny, G. Liu, T. Mano, M. Nakamura, H. Nishizawa, Y. Sone, E. Yamazaki, Y. Kisaka, K. Takasugi, K. Asahi, M. Ruffini, D. Kilper,
“Optical Network Tomography over Live Production Network in Multi-Domain Environment,”
European Conference on Optical Communication (ECOC) 2025, Copenhagen, Denmark, 2025.
ECOC
(Invited)		 T. Sasai,
“Forward, distributed fiber sensing will be deployed in networks within the next five years,”
in Workshop 8 “Digital signal processing for optical fiber sensing” European Conference on Optical Communication (ECOC) 2025, Copenhagen, Denmark, 2025.
ECOC
(Tutorial)		 H. Nishizawa, K. Anazawa, T. Mano, T. Sasai, G. Borraccini,
“Leveraging Digital Twins for All-Photonics Networks-as-a-Service: Enabling Innovation and Efficiency,”
European Conference on Optical Communication (ECOC) 2025, Copenhagen, Denmark, 2025.
ECOC R. Kaneko, T. Sasai, M. Nakamura, E. Yamazaki,
“Impact of Carrier Phase Recovery on Longitudinal Power Monitoring,”
European Conference on Optical Communication (ECOC) 2025, Copenhagen, Denmark, 2025.
ECOC H. Ishihara, T. Sasai, T. Mano, A. Yamamoto, H. Nishizawa, E. Yamazaki, Y. Sone,
“Robust Fibre Longitudinal Power Monitoring with Few Measurements using Two-stage Sparse Regularization,”
European Conference on Optical Communication (ECOC) 2025, Copenhagen, Denmark, 2025.
OECC/PSC
(Invited)		 T. Sasai, M. Takahashi, E. Yamazaki,
“Recent Advances in Digital Longitudinal Monitoring and Tomography of Fiber-Optic Link,”
30th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing (OECC/PSC) 2025, WC3-1.
OECC/PSC M. Takahashi, T. Sasai, E. Yamazaki,
“Fiber Characterization and Longitudinal Power Monitoring in Heterogeneous Fiber Link,”
30th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing (OECC/PSC) 2025, ThH1-6.
OECC/PSC H. Kawakami, F. Hamaoka, K. Kimura, M. Nakamura, T. Sasai, T. Kobayashi, Y. Miyamoto, E. Yamazaki,
“Low-Noise Forward Pumping with Optimized Longitudinal Modes for Distributed Raman Amplifier in S+C+L-Band Transmission,”
30th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing (OECC/PSC) 2025, TuB2-4.
HPSR
(Invited)		 T. Sasai,
“Digital Longitudinal Monitoring of Fiber-Optic Link for All-Photonics Network,”
IEEE International Conference on High Performance Switching and Routing (HPSR), 2025.
OFC T. Sasai, E. Yamazaki, S. Y. Set, and S. Yamashita,
“SNR of Fiber-Longitudinal Power Monitor,”
Optical Fiber Communications Conference and Exhibition (OFC) 2025, San Francisco, USA, W3E.4, 2025.
OFC
(Invited)		 T. Sasai,
“Design Principle of Fiber-Longitudinal Power Monitor,”
Optical Fiber Communications Conference and Exhibition (OFC) 2025, San Francisco, USA, M4A.3, 2025.
OFC R. Kaneko, T. Sasai, M. Nakamura, F. Hamaoka, E. Yamazaki,
“Visualizing Longitudinal Evolution of Forward- and Backward-Raman-Amplified Power and Gain,”
Optical Fiber Communications Conference and Exhibition (OFC) 2025, San Francisco, USA, W3E.3, 2025.
OFC F. Hamaoka, K. Kimura, M. Nakamura, T. Sasai, T. Kobayashi, Y. Miyamoto, E. Yamazaki,
“Net 107.7 Tb/s Triple-band WDM Transmission over 1200-km Single-Mode Fiber with Forward- and Backward-Pumped Distributed Raman Amplifiers,”
Optical Fiber Communications Conference and Exhibition (OFC) 2025, San Diego, USA, Th3C, 2025.
Photonics West
(Invited)		 T. Sasai,
“Fiber-optic link tomography enabled by optics-informed machine learning,”
Photonics West 2025, San Francisco, USA, 13375-68, 2025.

Domestic Conferences (Japan)

IEICE
(Invited)		 笹井 健生,
“光ファイバ伝送路の長手方向モニタリング技術”
電子情報通信学会ソサイエティ大会, 企画シンポジウム”光ネットワーク技術の最前線：基礎から最新応用まで” 岡山, 2025.

Preprint

arXiv T. Sasai, G. Borraccini, Y. K. Huang, H. Nishizawa, Z. Wang, T. Chen, Y. Sone, M. Takahashi, T. Matsumura, M. Nakamura, E. Yamazaki, K. Takasugi, T. Wang, and Y. Kisaka,
“Optical Link Tomography: First Field Trial and 4D Extension,”
arXiv preprint, arXiv:2510.09384, 2025.
arXiv H. Nishizawa, T. Mano, K. Anazawa, T. Matsumura, T. Sasai, M. Namiki, D. Briantcev, R. Ambrosone, E. L. Rouzic, S. Melin, O. Gonzalez-de-Dios, J. P. Fernandez-Palacios, X. Zhang, K. Akahoshi, G. Grammel, A. D’Amico, G. Borraccini, M. Ruffini, D. Kilper, V. Curri,
“Optical Network Digital Twin – Commercialization Barriers, Value Proposition, Early Use Cases, and Challenges,”
arXiv preprint, arXiv:2511.06368, 2025.
arXiv T. Mano, H. Nishizawa, T. Sasai, S. Usui, D. Briantcev, D. Dass, B. Bashaw, E. Kenny, M. Ruffini, Y. Sone, K. Takasugi, D. Kilper,
“Beyond Redundancy: Toward Agile Resilience in Optical Networks to Overcome Unpredictable Disasters,”
arXiv preprint, arXiv:2509.24038, 2025.

2024

Press release

NTT [EN] “World’s first and most accurate field demonstration of end-to-end visualization of fiber-optic link without measuring equipment ―Enables fast optical connection and maintenance through the realization of the digital twin of optical network―”[JP] 「光ファイバ伝送路の状態を測定器なしでエンドツーエンドに可視化できる技術を開発し、世界初、世界最高精度でのフィールド実証に成功～光ネットワークのデジタルツインの実現へ前進、迅速な光接続/保守が可能に～」
NTT [EN] “400Gbps/800Gbps IOWN APN demonstration at OFC2024 by multi-vendor products leveraging photonics-electronics convergence device and open standards Achieving low latency and low power consumption all- optical connections for distributed data centers―”[JP] 「光電融合技術とオープン標準を用いた複数社製品による400Gbps/800Gbps IOWN APNをOFC2024で動態展示～光のまま低遅延・低電力で分散型データセンタを接続～」

Journal articles

JLT T. Sasai, M. Takahashi, M. Nakamura, E. Yamazaki, and Y. Kisaka,
“Linear Least Squares Estimation of Fiber-Longitudinal Optical Power Profile,”
Journal of Lightwave Technology, 42(6), pp.1955-1965, 2024.
NTT Tech. Rev. T. Sasai,
“Digital Longitudinal Monitoring of Fiber-optic Link Using Coherent Receiver,”
NTT Technical Review, 22(9), pp. 73–78, 2024.
JOCN H. Nishizawa, G. Borraccini, T. Sasai, Y.-K. Huang, T. Mano, K. Anazawa, M. Namiki, S. Usui, T. Matsumura, Y. Sone, Z. Wang, S. Okamoto, T. Inoue, E. Ip, A. D’Amico, T. Chen, V. Curri, T. Wang, K. Asahi, and K. Takasugi,
“Semi-automatic line-system provisioning with an integrated physical-parameter-aware methodology: field verification and operational feasibility,”
Journal of Optical Communications and Networking, 16, pp.894-904, 2024.
JLT D. Wang, Y. Song, Y. Zhang, X. Jiang, J. Dong, F.N. Khan, T. Sasai, S. Huang, A.P.T. Lau, M. Tornatore, M. Zhang,
“Digital Twin of Optical Networks: A Review of Recent Advances and Future Trends,”
Journal of Lightwave Technology, 42(12), pp. 4233-4259, 2024.
JLT M. Takahashi, T. Sasai, E. Yamazaki and Y. Kisaka,
“Monitoring PDL Value and Location Using DSP-Based Longitudinal Power Profile Estimation,”
Journal of Lightwave Technology, 42(17), pp. 5866-5873, 2024.
JLT A. Kawai, M. Nakamura, T. Kobayashi, M. Nagatani, H. Yamazaki, T. Sasai, F. Hamaoka, Y. Miyamoto,
“Digital Inverse Multiplexing for Transmitters with Symbol Rates over DAC Bandwidth Limit,”
Journal of Lightwave Technology, 42(11), pp. 4076-4085, 2024.

Conferences

IPC H. Nishizwa, G. Borraccini, T. Sasai, Y. K. Huang, T. Mano, K. Anazawa, M. Namiki, S. Usui, T. Matsumura, Y. Sone, Z. Wang, S. Okamoto, T. Inoue, E. Ip, A. D’Amico, T. Chen, V. Curri, T. Wang, K. Asahi, T. Yoshida, K. Takasugi,
“Field Verification of Fault Localization with Integrated Physical-Parameter-Aware Methodology,”
IEEE Photonics Conference 2024, Rome, Italy, 2024.
ACP
(Invited)		 T. Sasai,
“Digital Longitudinal Monitoring for Digital Twin Operation of Optical Network,”
Asia Communications and Photonics Conference (ACP), Workshop “Digital Twin of Optical Communication Systems”, Beijing, China, 2024.
ECOC
(Top-scored paper)		 T. Sasai, M. Takahashi, M. Nakamura, E. Yamazaki, and Y. Kisaka,
“On the Signal Pattern Effect on Fiber-Longitudinal Power Monitor,”
European Conference on Optical Communication (ECOC) 2024, Frankfurt, Germany, M3E.1, 2024.
ECOC
(Top-scored paper)		 M. Nakamura, H. Wakita, M. Nagatani, Y. Ogiso, F. Hamaoka, Y. Shiratori, T. Sasai, H. Takahashi, T. Kobayashi, and Y. Miyamoto,
“46.4-Tb/s Full C-band 246-km Transmission with Net >2-Tb/s/λ WDM Signals Using >100-GHz-BW InP-based Tx Front-end,”
European Conference on Optical Communication (ECOC) 2024, Frankfurt, Germany, Tu4B.5, 2024.
ECOC M. Takahashi, T. Sasai, M. Nakamura, and E. Yamazaki,
“Experimental Investigation of Longitudinal Power Profile Estimation Accuracy in Fibre Links with Large Effective Core Area,”
European Conference on Optical Communication (ECOC) 2024, Frankfurt, Germany, W2A.105, 2024.
ECOC R. Kaneko, T. Sasai, M. Takahashi, M. Nakamura, and E. Yamazaki,
“Accuracy Comparison between Forward- or Backward-based Implementation of Longitudinal Power Profile Estimation,”
European Conference on Optical Communication (ECOC) 2024, Frankfurt, Germany, M3E.3, 2024.
OECC M. Takahashi, T. Sasai, E. Yamazaki,
“Experimental Investigation of the Impact of Transceiver Imperfections on Longitudinal Power Profile Estimation,”
Opto-Electronics and Communications Conference(OECC), 219, Melbourne, Australia, 2024.
OECC Y. Nakajima, A. Masuda, H. Taniguchi, S. Yamamoto, Y. Sone, S. Okamoto, T. Sasai, E. Yamazaki,
“Real-Time Demonstration of Automatic Laser Frequency Adjustments for Intra-Data Center Coherent Transmissions,”
Opto-Electronics and Communications Conference(OECC), 219, Melbourne, Australia, 2024. 
OFC
(Post-deadline paper)		 T. Sasai, G. Borraccini, Y. K. Huang, H. Nishizawa, Z. Wang, T. Chen, Y. Sone, T. Matsumura, M. Nakamura, E. Yamazaki, Y. Kisaka,
“4D Optical Link Tomography: First Field Demonstration of Autonomous Transponder Capable of Distance, Time, Frequency, and Polarization-Resolved Monitoring,”
Optical Fiber Communications Conference and Exhibition (OFC) 2024, San Diego, USA, Th4B.7, 2024.
OFC
(Invited)		 T. Sasai,
“Recent Advances in Digital Longitudinal Monitoring of Fiber-Optic Link,”
Optical Fiber Communications Conference and Exhibition (OFC) 2024, San Diego, USA, W1B.3, 2024.
OFC
(Invited)		 T. Sasai,
“Digital Longitudinal Monitoring of Fiber-Optic Link,”
at Workshop “Neural Networks for Optical Fiber Transmission: Hype or Hope?,” Optical Fiber Communications Conference and Exhibition (OFC) 2024, San Diego, USA, 2024.
OFC R. Kaneko, T. Sasai, F. Hamaoka, M. Nakamura, and E. Yamazaki,
“Fiber Longitudinal Monitoring of Inter-band-SRS-induced Power Transition in S+C+L WDM Transmission,”
Optical Fiber Communications Conference and Exhibition (OFC) 2024, San Diego, USA, W1B.4, 2024.
OFC K. Suzuki, M. Ota, Y. Morimoto, K. Yamaguchi, F. Hamaoka, S. Sugawara, T. Sasai, T. Kobayashi, M. Nakamura, S. Katayose, T. Umeki, D. Ogawa, Y. Ma, S. Camatel, M. Fukutoku, Y. Miyamoto, and O. Moriwaki,
“Double-decker CDC-ROADM node for multi-band network with wavelength band granularity,”
Optical Fiber Communications Conference and Exhibition (OFC) 2024, San Diego, USA, 2024.
OFC F. Hamaoka, M. Nakamura, T. Sasai, S. Sugawara, T. Kobayashi, Y. Miyamoto, and E. Yamazaki,
“110.7-Tb/s Single-Mode-Fiber Transmission over 1040 km with High-Symbol-Rate 144-GBaud PDM-PCS-QAM Signals,”
Optical Fiber Communications Conference and Exhibition (OFC) 2024, San Diego, USA, 2024.
Photonics West
(Invited)		 T. Sasai,
“Digital Longitudinal Monitoring of Fiber-Optic Link,”
in Photonics West 2024, San Francisco, USA, 12894-20, 2024.

Domestic Conferences (Japan)

LST 笹井健生, セットジイヨン, 山下真司,
“光リンクトモグラフィの雑音解析”
第71回光波センシング研究会, LST-06, 2024.
OCS
(Invited)		 笹井健生,
“［招待講演］コヒーレント受信器を用いた光ファイバ伝送路の長手方向モニタリング技術”
OCS研究会、2024.
レーザ学会
(Invited)		 笹井健生,
“非線形シュレディンガー方程式の逆解析による光伝送路モニタリング”
at “光ソリトン通信50周年記念シンポジウム ファイバ非線形性への挑戦” レーザ学会学術講演会第44回年次大会、2024.

Preprint

arXiv T. Sasai, S. Y. Set, and S. Yamashita,
“Design of Fiber-Longitudinal Optical Power Monitor,”
arXiv preprint, arXiv:2410.12602, 2024.

2023

Journal articles

JLT
(Invited)		 T. Sasai, E. Yamazaki, and Y. Kisaka,
“Performance Limit of Fiber-Longitudinal Power Profile Estimation Methods,”
Journal of Lightwave Technology, 41(11), pp.3278-3289, 2023.
IEEE Comm. Mag. H. Nishizawa, T. Sasai, T. Inoue et al.,
“Dynamic Optical Path Provisioning for Alien Access Links: Architecture, Demonstration, and Challenges,”
IEEE Communications Magazine, 61(4), pp.136-142, 2023.
NTT Tech. Rev. F. Hamaoka, K. Saito, A. Masuda, H. Taniguchi, T. Sasai, M. Nakamura, T. Kobayashi, and Y. Kisaka,
“Over 100-Tbit/s Ultra-wideband Wavelength Division Multiplexed Transmission Technologies for Future Optical Transport Network Systems,”
NTT Technical Review, 21(3), pp. 27–33, 2023.

Conferences

ECOC T. Sasai, Y. Sone, E. Yamazaki, M. Nakamura and Y. Kisaka,
“A Generalized Method for Fiber-longitudinal Power Profile Estimation,”
in European Conference on Optical Communication (ECOC) 2023, Glasgow, Scotland, Tu.A.2.6, 2023.
ECOC M. Takahashi, T. Sasai, E. Yamazaki, and Y. Kisaka,
“Experimental Demonstration of Monitoring PDL Value and Location Using DSP-Based Longitudinal Power Estimation with Linear Least Squares,”
in European Conference on Optical Communication (ECOC) 2023, Glasgow, Scotland, P14, 2023.
ECOC M. Nakamura, T. Sasai, F. Hamaoka, M. Nagatani, H. Yamazaki, T. Jyo, M. Mutou, Y. Shiratori, H. Wakita, T. Kobayashi, H. Takahashi, Y. Kisaka, Y. Miyamoto,
“High symbol rate 200-GBd PDM-QPSK Transmission over 3520 km Using Ultra-broadband InP-DHBT Analogue Multiplexer,”
in European Conference on Optical Communication (ECOC) 2023, Glasgow, Scotland, We.D.5.4, 2023.
ECOC F. Hamaoka, M. Nakamura, T. Sasai, T. Kobayashi, Y. Kisaka, and Y. Miyamoto,
“Net Bitrate of >1.3-Tb/s/λ Transmission over 80 km with Transmitter-side Semiconductor Optical Amplifier,”
in European Conference on Optical Communication (ECOC) 2023, Glasgow, Scotland, P12, 2023.
ECOC
(Top-scored)		 A. Kawai, M. Nakamura, T. Kobayashi, M. Nagatani, H. Yamazaki, T. Sasai, F. Hamaoka, and Y. Miyamoto,
“Digital Inverse Multiplexing-based Pre-distortion for Analog Multiplexed Broadband Transmitter,”
in European Conference on Optical Communication (ECOC) 2023, Glasgow, Scotland, We.D.3.2
OECC M. Takahashi, T. Sasai, E. Yamazaki, and Y. Kisaka,
“DSP-based PDL Estimation and Localization in Multi-Span Optical Link Using Least Squares-based Longitudinal Power Monitoring,”
in Opto-Electronics and Communications Conference(OECC) 2023, Shanghai, China, OECC2023-0317-21, 2023.
OECC R. Kaneko, T. Sasai, M. Takahashi, E. Yamazaki, and Y. Kisaka,
“Experimental Performance Evaluation of Rx DSP-based Fiber-longitudinal Power Profile Estimation,”
in Opto-Electronics and Communications Conference(OECC) 2023, Shanghai, China, OECC2023-0320-74, 2023.
APC
(Invited)		 T. Sasai,
“Digital Longitudinal Monitoring for Optical Networks,”
Advanced Photonics Congress, Workshop “AI and Digital Twin for Transforming Optical Networks: What They Can and Cannot Do?”, Busan, Korea, 2023.
OFC T. Sasai et al.,
“0.77-dB Anomaly Loss Localization Based on DSP-Based Fiber-Longitudinal Power Estimation Using Linear Least Squares,”
in Optical Fiber Communications Conference and Exhibition (OFC) 2023, San Diego, USA, W1H.4, 2023.

Domestic Conferences (Japan)

OCS
(Invited)		 笹井健生,
“非線形シュレディンガー方程式の機械学習とその応用,”
OCSサマースクール, 2023.

Preprint

arXiv T. Sasai, M. Takahashi, M. Nakamura, E. Yamazaki, and Y. Kisaka,
“Linear Least Squares Estimation of Fiber-Longitudinal Optical Power Profile,”
arXiv preprint, arXiv:2310.04936, 2023.

2022

Journal articles

JLT (Top-scored)T. Sasai, M. Nakamura, E. Yamazaki, S. Yamamoto, H. Nishizawa, and Y. Kisaka,
“Digital Longitudinal Monitoring of Optical Fiber Communication Link,”
Journal of Lightwave Technology, 40(8), pp.2390-2408, 2022.

Conferences

ECOC T. Sasai et al.,
“Closed-Form Expressions for Fiber-Nonlinearity-Based Longitudinal Power Profile Estimation Methods,”
in European Conference on Optical Communication (ECOC) 2022, Basel, Switzerland, Tu1D.6, 2022.
ECOC
(Invited)		 T. Sasai et al.,
“Digital Longitudinal Monitoring of Optical Transmission Link,”
in European Conference on Optical Communication (ECOC) 2022, Basel, Switzerland, Th1D.1, 2022.
OECC T. Sasai et al.,
“Proposal of Linear Least Squares for Fiber-Nonlinearity-Based Longitudinal Power Monitoring in Multi-Span Link,”
in OptElectronics and Communications Conference/ International Conference on Photonics in Switching and Computing (OECC/PSC) 2022, Toyama, Japan, WB3-1, 2022.
OECC F. Hamaoka et al.,
“112.8-Tb/s Real-Time Transmission over 101 km in 16.95-THz Triple-Band (S, C, and L Bands) WDM Configuration,”
in OptElectronics and Communications Conference/ International Conference on Photonics in Switching and Computing (OECC/PSC) 2022, Toyama, Japan, 2022.
OFC T. Sasai et al.,
“Precise Longitudinal Power Monitoring over 2,080 km Enabled by Step Size Selection of Split Step Fourier Method,”
in Optical Fiber Communications Conference and Exhibition (OFC) 2022, San Diego, USA, Th1C.4, 2022.
OFC M. Nakamura et al.,
“1.0-Tb/s/λ 3840-km and 1.2-Tb/s/λ 1280-km Transmissions with 168-GBaud PCS-QAM Signals Based on AMUX Integrated Frontend Module,”
in Optical Fiber Communications Conference and Exhibition (OFC) 2022, San Diego, USA, 2022.
OFC K. Saito et al.,
“Impact of Local Oscillator Phase Noise on Long-Haul Transmission of 120-Gbaud Digital Sub-Carrier Signals,”
in Optical Fiber Communications Conference and Exhibition (OFC) 2022, San Diego, USA, 2022.

Domestic Conferences (Japan)

OITDA 笹井健生,
“光伝送システムの長軸方向モニタリング技術”
光ネットワーク産業技術研究会，オンライン, 2022.

Preprint

arXiv T. Sasai, E. Yamazaki, and Y. Kisaka,
“Performance limit of Fiber-Longitudinal Power Profile Estimation Methods,”
arXiv preprint, arXiv:2211.08128, 2022.

2021

Journal articles

Laser Rev.
(Invited)		 T. Sasai,
“Physics-Oriented Learning of Nonlinear Schrödinger Equation for Digital Longitudinal Monitoring of Optical Transmission Systems,”
Laser reviews, 49(12), pp.653-659, 2021.
JOCN H. Nishizawa, W. Ishida, Y. Sone, T. Tanaka, S. Kuwabara, T. Inui, T. Sasai, and M. Tomizawa,
“Open whitebox architecture for smart integration of optical networking and data center technology,”
Journal of Optical Communications and Networking, 13, pp.A78 – A87, 2021.
JLT H. Maeda, K. Saito, H. Kawahara, T. Seki, T. Sasai and F. Hamaoka,
“High Spectral Efficiency Real-Time 500-Gb/s/carrier Long-Haul Transmission Over Field-Installed Fibers,”
Journal of Lightwave Technology, 39(4), pp. 933-939, 2021.

Conferences

OFC T. Sasai et al.,
“Revealing Raman-amplified Power Profile and Raman Gain Spectra with Digital Backpropagation,”
in Optical Fiber Communications Conference and Exhibition (OFC) 2021, San Francisco, USA, M3I.5, 2021.
OECC K. Anazawa et al.,
“Automatic Modulation-Format Selection with White-box Transponders: Design and Field Trial,”
in OptElectronics and Communications Conference (OECC) 2021, HongKong, 2021.

Domestic Conferences (Japan)

OCS 笹井健生 他,
“非線形シュレディンガー方程式の学習による光伝送システムの長軸方向モニタリング技術”
電子情報通信学会 OCS研究会 OCSシンポジウム, オンライン, P02, 2021.
IEICE 笹井健生,
“高多値デジタルコヒーレント光通信におけるレーザ位相雑音の影響”
電子情報通信学会 ソサエティ大会2021, オンライン, CI-2-1, 2021.
IEICE
(Young Researchers Award)		 笹井健生 他,
“非線形シュレディンガー方程式の学習: 損失分布とPassband narrowingの推定”
電子情報通信学会 総合大会2021, オンライン, B-10-11, 2021.
IEICE Tech. Rep.
(Young Researcher Award)		 Takeo Sasai et al.,
“Digital backpropagation for optical path monitoring — Loss and Dispersion profile estimation,”
IEICE Tech. Rep., vol. 120, no. 309, OCS2020-39, pp. 61-64, Jan. 2021.

Preprint

arXiv T. Sasai, M. Nakamura, E. Yamazaki, S. Yamamoto, H. Nishizawa, Y. Kisaka,
“Physics-oriented learning of nonlinear Schrödinger equation: optical fiber loss and dispersion profile identification,”
arXiv preprint, arXiv:2104.05890, 2021.

General Magazine

BCM 笹井健生,
“非線形シュレディンガー方程式の学習によるマルチスパン光伝送路モニタリング技術”
ビジネスコミュニケーション, 58(6), 2021.

2020

Journal articles

IEICE Trans. F. Hamaoka, T. Sasai, K. Saito, T. Kobayashi, A. Matsushita, M. Nakamura, H. Taniguchi, S. Kuwahara, H. Kawahara, T. Seki, J. Ozaki, Y. Ogiso, H. Maeda, Y. Kisaka, and M. Tomizawa,
“Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder,”
IEIEC Transactions on Communications, E103-B(11), pp.1183-1189, 2020.
Opt. Express H. Maeda, K. Saito, T. Sasai, F. Hamaoka, H. Kawahara, T. Seki, T. Kawasaki, J. Kani,
“Real-time 400 Gbps/carrier WDM transmission over 2,000 km of field-installed G.654.E fiber,”
Optics Express 28(2), 1640-1646, 2020.
Opt. Express T. Sasai, M. Nakamura, E. Yamazaki, A.Matsushita, S. Okamoto, K. Horikoshi, Y. Kisaka,
“Wiener-Hammerstein Model and Its Learning for Nonlinear Digital Pre-distortion of Optical Transmitter,”
Optics Express, 28(21), pp.30952-30963, 2020.
JLT
(Invited)		 T. Sasai, A. Matsushita, M.Nakamura, S. Okamoto, F. Hamaoka, and Y. Kisaka,
“Laser Phase Noise Tolerance of Uniform and Probabilistically Shaped QAM Signals for High Spectral Efficiency Systems,”
Journal of Lightwave Technology, 38(2), pp.439-446, 2020.

Conferences

ECOC
(Upgraded paper)		 T. Sasai et al.,
“Digital Backpropagation for Optical Path Monitoring: Loss Profile and Passband Narrowing Estimation,”
in European Conference on Optical Communications(ECOC) 2020, Brussels, Belgium, Tu2D-1, 2020.
OFC T. Sasai, M. Nakamura, S. Okamoto, F. Hamaoka, S. Yamamoto, E. Yamazaki, A. Matsushita, H. Nishizawa, and Y. Kisaka,
“Simultaneous Detection of Anomaly Points and Fiber types in Multi-span Transmission Links Only by Receiver-side Digital Signal Processing,”
in Optical Fiber Communications Conference and Exhibition(OFC) 2020, San Diego, CA, USA, Th1F.1, 2020
OFC H. Maeda, H. Kawahara, K. Saito, T. Seki, T. Sasai and F. Hamaoka,
“Real-Time Demonstration of 500-Gbps/Lambda and 600-Gbps/Lambda WDM Transmission on Field-Installed Fibers,”
Optical Fiber Communications Conference and Exhibition (OFC), San Diego, CA, USA, 2020.
OFC K. Saito, T. Sasai, F. Hamaoka, H. Kawahara, T. Seki and H. Maeda,
“High spectral efficiency real-time 500-Gb/s/carrier transmission over field-installed G.654.E fiber link using forward and backward distributed Raman amplification,”
Optical Fiber Communications Conference and Exhibition (OFC), San Diego, CA, USA, 2020.
Photonics West K. Minoguchi, F. Hamaoka, S. Okamoto, T. Sasai, K. Horikoshi, A. Matsushita, M. Nakamura, E. Yamazaki, Y. Kisaka,
“Beyond 100-Tb/s ultra-wideband transmission in S, C, and L bands over single-mode fiber,”
Photonics West, 2020.

Domestic Conferences (Japan)

IEICE 笹井健生 他,
“光伝送路モニタリング技術としてのDigital backpropagation:損失/分散分布の推定”
電子情報通信学会 ソサエティ大会2020, オンライン, B-10-12, 2020.

Preprint

arXiv T. Sasai, M. Nakamura, E. Yamazaki, A.Matsushita, S. Okamoto, K. Horikoshi, Y. Kisaka,
“Wiener-Hammerstein model and its learning for nonlinear digital pre-distortion of optical transmitters,”
arXiv preprint, arXiv:2012.08046, 2020.
arXiv T. Sasai, A. Matsushita, M.Nakamura, S. Okamoto, F. Hamaoka, and Y. Kisaka,
“Laser Phase Noise Tolerance of Uniform and Probabilistically-shaped QAM Signals for High Spectral Efficiency Systems,”
arXiv preprint, arXiv:2012.08078, 2020.

General Magazine

Research Outreach Takeo Sasai,
“How did the data propagate?”
Research Outreach, issue 119, pp.106-109, 2020

~2019

Jornal articles

JLT F. Hamaoka et al.,
“Ultra-Wideband WDM Transmission in S-, C-, and L-Bands Using Signal Power Optimization Scheme,”
in Journal of Lightwave Technology, vol. 37, no. 8, pp. 1764-1771, 15 April15, 2019.

Conferences

OECC F. Hamaoka et al.,
“Dual-Carrier 1-Tb/s Transmission Over Field-Deployed Large-Core Pure-Silica-Core Fiber Link Using Real-Time Transponder,”
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC), Fukuoka, Japan, 2019.
OFC
(Top-Scored paper)		 T. Sasai, A. Matsushita, M. Nakamura, S. Okamoto, F. Hamaoka, and Y. Kisaka,
“Experimental Analysis of Laser Phase Noise Tolerance of Uniform 256QAM and Probabilistically Shaped 1024QAM,”
in Optical Fiber Communications Conference and Exhibition(OFC) OFC2019, San Diego, CA, USA, W1D.5, 2019.
ECOC F. Hamaoka et al.,
“150.3-Tb/s Ultra-Wideband (S, C, and L Bands) Single-Mode Fibre Transmission over 40-km Using >519Gb/s/A PDM-128QAM Signals,”
2018 European Conference on Optical Communication (ECOC), Rome, Italy, 2018.
OECC T. Sasai, F. Hamaoka, A. Matsushita, M. Nakamura, H. Kawakami, and Y. Kisaka,
“Experimental Investigation of Laser Linewidth Tolerance of 32-GBaud DP-256QAM Optical Coherent System,”
in Opto-Electronics and Communications Conference(OECC) 2018, Jeju Island, Korea (South), 6D2-1, 2018.
CLEO T. Sasai, M. Kishi, and K. Hotate,
“Enhancement of Spatial Resolution in Distributed Measurement of Brillouin Dynamic Grating Spectrum by Optical Correlation Domain Analysis,”
in Conference on Lasers and Electro-Optics(CLEO)2016, San Jose, CA, USA, SM3P.6, 2016

Domestic Conferences (Japan)

JSAP 笹井健生, 岸眞人, 保立和夫,
“光相関領域法によるブリルアンダイナミックグレーティングスペクトラムの分布測定におけるポンプ・リード間光路長差の影響”
応用物理学会春季学術講演会, パシフィコ横浜, 16a-316-4, 2017.
JSAP 笹井健生, 岸眞人, 保立和夫,
“ブリルアンダイナミックグレーティングを用いた光相関領域法による温度・歪の分離分布測定の高空間分解能化に関する研究”
応用物理学会春季学術講演会, 東京工業大学, 20p-H116-16, 2016
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