Takeo Sasai

According to our database, Takeo Sasai authored at least 41 papers between 2018 and 2026.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2026

Leveraging Digital Twin Technologies: All-Photonics Networks-as-a-Service for Data Center Xchange in the Era of AI [Invited Tutorial].

Hideki Nishizawa, Kazuya Anazawa, Tetsuro Inui, Toru Mano, Takeo Sasai, Giacomo Borraccini, Tatsuya Matsumura, Hiroyuki Ishihara, Sae Kojima, Yoshiaki Sone, Koichi Takasugi

CoRR, January, 2026

Mode-Resolved Longitudinal Power and MDL Monitoring in Multi-Mode Fiber Transmission.

Minami Takahashi, Takeo Sasai, Megumi Hoshi, Masanori Nakamura, Akira Kawai, Kohki Shibahara, Takayuki Kobayashi, Yutaka Miyamoto, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2026

Closed-form Expression for Spatial Correlation Function of Nonlinear Fiber Propagation and Its Applications to Longitudinal Power Monitoring.

Takeo Sasai, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2026

First Coherent DSP and Pluggable Transceiver Capable of Distance-Resolved, Longitudinal Power Monitoring.

Takeo Sasai, Yukinobu Nakajima, Minami Takahashi, Runa Kaneko, Masanori Nakamura, Asuka Matsushita, Fukutaro Hamaoka, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2026

OSNR/GSNR Prediction in Brownfield Links via a DLM-Anchored Hybrid Physics/ML Model.

Agastya Raj, Venkata Virajit Garbhapu, Hiroyuki Ishihara, Peyman Pahlevanzadeh, Hideki Nishizawa, Takeo Sasai, Daniel C. Kilper, Marco Ruffini

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2026

Optimal Spatial Step Size in Longitudinal Power Monitoring.

Runa Kaneko, Takeo Sasai, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2026

2025

Optical Network Digital Twin - Commercialization Barriers, Value Proposition, Early Use Cases, and Challenges.

Hideki Nishizawa, Toru Mano, Kazuya Anazawa, Tatsuya Matsumura, Takeo Sasai, Masatoshi Namiki, Dmitrii Briantcev, Renato Ambrosone, Esther Le Rouzic, Stefan Melin, Óscar González de Dios, Juan Pedro Fernández-Palacios, Xiaocheng Zhang, Keigo Akahoshi, Gert Grammel, Andrea D'Amico, Giacomo Borraccini, Marco Ruffini, Daniel C. Kilper, Vittorio Curri

CoRR, November, 2025

Beyond Redundancy: Toward Agile Resilience in Optical Networks to Overcome Unpredictable Disasters.

Toru Mano, Hideki Nishizawa, Takeo Sasai, Soichiroh Usui, Dmitrii Briantcev, Devika Dass, Brandt Bashaw, Eoin Kenny, Marco Ruffini, Yoshiaki Sone, Koichi Takasugi, Daniel C. Kilper

CoRR, September, 2025

SNR of Fiber-Longitudinal Power Monitor.

Takeo Sasai, Etsushi Yamazaki, Sze Yun Set, Shinji Yamashita

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2025

Design Principle of Fiber-Longitudinal Power Monitor.

Takeo Sasai

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2025

Visualizing Longitudinal Evolution of Forward- and Backward-Raman-Amplified Power and Gain.

Runa Kaneko, Takeo Sasai, Masanori Nakamura, Fukutaro Hamaoka, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2025

Net 107.7-Tb/s Triple-Band WDM Transmission Over 1200-km Single-Mode Fiber With Forward- and Backward-Pumped Distributed Raman Amplifiers.

Fukutaro Hamaoka, Kosuke Kimura, Masanori Nakamura, Takeo Sasai, Takayuki Kobayashi, Yutaka Miyamoto, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2025

Tens-Of-Metre Resolution Longitudinal Power Monitoring Over 302-Km Fibre Link.

Takeo Sasai, Minami Takahashi, Fukutaro Hamaoka, Masanori Nakamura, Shuto Sugawara, Shuto Yamamoto, Hideki Nishizawa, Yoshiaki Sone, Etsushi Yamazaki

Proceedings of the European Conference on Optical Communications, 2025

Optical Network Tomography Over Live Production Network in Multi-Domain Environment.

Takeo Sasai, Kazuya Anazawa, Dmitrii Briantcev, Devika Dass, Sumaiya Ali, Giacomo Borraccini, Yoshiharu Kobatake, Hiroyuki Ishihara, Eoin Kenny, Garwin Liu, Toru Mano, Masanori Nakamura, Hideki Nishizawa, Yoshiaki Sone, Etsushi Yamazaki, Yoshiaki Kisaka, Koichi Takasugi, Koji Asahi, Marco Ruffini, Daniel C. Kilper

Proceedings of the European Conference on Optical Communications, 2025

Leveraging Digital Twins for All-Photonics Networks-as-a-Service: Enabling Innovation and Efficiency (Tutorial).

Hideki Nishizawa, Kazuya Anazawa, Toru Mano, Takeo Sasai, Giacomo Borraccini

Proceedings of the European Conference on Optical Communications, 2025

Impact of Carrier Phase Recovery on Longitudinal Power Monitoring.

Runa Kaneko, Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki

Proceedings of the European Conference on Optical Communications, 2025

Robust Fibre Longitudinal Power Monitoring with Few Measurements Using Two-Stage Sparse Regularization.

Hiroyuki Ishihara, Takeo Sasai, Toru Mano, Atsushi Yamamoto, Hideki Nishizawa, Etsushi Yamazaki, Yoshiaki Sone

Proceedings of the European Conference on Optical Communications, 2025

2024

Semi-automatic line-system provisioning with an integrated physical-parameter-aware methodology: field verification and operational feasibility.

Hideki Nishizawa, Giacomo Borraccini, Takeo Sasai, Yue-Kai Huang, Toru Mano, Kazuya Anazawa, Masatoshi Namiki, Soichiroh Usui, Tatsuya Matsumura, Yoshiaki Sone, Zehao Wang, Seiji Okamoto, Takeru Inoue, Ezra Ip, Andrea D'Amico, Tingjun Chen, Vittorio Curri, Ting Wang, Koji Asahi, Koichi Takasugi

J. Opt. Commun. Netw., 2024

Semi-Automatic Line-System Provisioning with Integrated Physical-Parameter-Aware Methodology: Field Verification and Operational Feasibility.

Hideki Nishizawa, Giacomo Borraccini, Takeo Sasai, Yue-Kai Huang, Toru Mano, Kazuya Anazawa, Masatoshi Namiki, Soichiroh Usui, Tatsuya Matsumura, Yoshiaki Sone, Zehao Wang, Seiji Okamoto, Takeru Inoue, Ezra Ip, Andrea D'Amico, Tingjun Chen, Vittorio Curri, Ting Wang, Koji Asahi, Koichi Takasugi

CoRR, 2024

Double-decker CDC-ROADM node for multi-band network with wavelength band granularity.

Kenya Suzuki, Masashi Ota, Yoshie Morimoto, Keita Yamaguchi, Fukutaro Hamaoka, Shuto Sugawara, Takeo Sasai, Takayuki Kobayashi, Masanori Nakamura, Satomi Katayose, Takeshi Umeki, Daisuke Ogawa, Yiran Ma, Stefano Camatel, Mitsunori Fukutoku, Yutaka Miyamoto, Osamu Moriwaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2024

Recent Advances in Digital Longitudinal Monitoring of Fiber-Optic Link.

Takeo Sasai, Minami Takahashi, Runa Kaneko, Yoshiaki Sone, Masanori Nakamura, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2024

4D Optical Link Tomography: First Field Demonstration of Autonomous Transponder Capable of Distance, Time, Frequency, and Polarization Resolved Monitoring.

Takeo Sasai, Giacomo Borraccini, Yue-Kai Huang, Hideki Nishizawa, Zehao Wang, Tingjun Chen, Yoshiaki Sone, Tatsuya Matsumura, Masanori Nakamura, Etsushi Yamazaki, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2024

Fiber Longitudinal Monitoring of Inter-band-SRS-induced Power Transition in S+C+L WDM Transmission.

Runa Kaneko, Takeo Sasai, Fukutaro Hamaoka, Masanori Nakamura, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2024

110.7-Tb/s Single-Mode-Fiber Transmission over 1040 km with High-Symbol-Rate 144-GBaud PDM-PCS-QAM Signals.

Fukutaro Hamaoka, Masanori Nakamura, Takeo Sasai, Shuto Sugawara, Takayuki Kobayashi, Yutaka Miyamoto, Etsushi Yamazaki

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2024

2023

Dynamic Optical Path Provisioning for Alien Access Links: Architecture, Demonstration, and Challenges.

Hideki Nishizawa, Takeo Sasai, Takeru Inoue, Kazuya Anazawa, Toru Mano, Kei Kitamura, Yoshiaki Sone, Tetsuro Inui, Koichi Takasugi

IEEE Commun. Mag., April, 2023

0.77-dB Anomaly Loss Localization Based on DSP-Based Fiber-Longitudinal Power Estimation Using Linear Least Squares.

Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki, Hideki Nishizawa, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2023

2022

Proposal of Linear Least Squares for Fiber-Nonlinearity-Based Longitudinal Power Monitoring in Multi-Span Link.

Takeo Sasai, Etsushi Yamazaki, Masanori Nakamura, Yoshiaki Kisaka

Proceedings of the 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC), 2022

112.8-Tb/s Real-Time Transmission over 101 km in 16.95-THz Triple-Band (S, C, and L Bands) WDM Configuration.

Fukutaro Hamaoka, Kohei Saito, Akira Masuda, Hiroki Taniguchi, Takeo Sasai, Masanori Nakamura, Takayuki Kobayashi, Yoshiaki Kisaka

Proceedings of the 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC), 2022

Precise Longitudinal Power Monitoring over 2, 080 km Enabled by Step Size Selection of Split Step Fourier Method.

Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2022

Impact of Local Oscillator Phase Noise on Long-Haul Transmission of 120-Gbaud Digital Sub-Carrier Signals.

Kohei Saito, Masanori Nakamura, Takeo Sasai, Takeshi Kakizaki, Fukutaro Hamaoka, Takayuki Kobayashi, Etsushi Yamazaki, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2022

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.

Masanori Nakamura, Takeo Sasai, Kohei Saito, Fukutaro Hamaoka, Takayuki Kobayashi, Hiroshi Yamazaki, Munehiko Nagatani, Yoshihiro Ogiso, Hitoshi Wakita, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2022

2021

Open whitebox architecture for smart integration of optical networking and data center technology [Invited].

Hideki Nishizawa, Wataru Ishida, Yoshiaki Sone, Takafumi Tanaka, Seiki Kuwabara, Tetsuro Inui, Takeo Sasai, Masahito Tomizawa

JOCN, 2021

Revealing Raman-amplified Power Profile and Raman Gain Spectra with Digital Backpropagation.

Takeo Sasai, Masanori Nakamura, Takayuki Kobayashi, Hiroto Kawakami, Etsushi Yamazaki, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2021

2020

Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder.

Fukutaro Hamaoka, Takeo Sasai, Kohei Saito, Takayuki Kobayashi, Asuka Matsushita, Masanori Nakamura, Hiroki Taniguchi, Shoichiro Kuwahara, Hiroki Kawahara, Takeshi Seki, Josuke Ozaki, Yoshihiro Ogiso, Hideki Maeda, Yoshiaki Kisaka, Masahito Tomizawa

IEICE Trans. Commun., 2020

Simultaneous Detection of Anomaly Points and Fiber Types in Multi-Span Transmission Links Only by Receiver-Side Digital Signal Processing.

Takeo Sasai, Masanori Nakamura, Seiji Okamoto, Fukutaro Hamaoka, Shuto Yamamoto, Etsushi Yamazaki, Asuka Matsushita, Hideki Nishizawa, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2020

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.

Kohei Saito, Takeo Sasai, Fukutaro Hamaoka, Hiroki Kawahara, Takeshi Seki, Hideki Maeda

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2020

Real-Time Demonstration of 500-Gbps/Lambda and 600-Gbps/Lambda WDM Transmission on Field-Installed Fibers.

Hideki Maeda, Hiroki Kawahara, Kohei Saito, Takeshi Seki, Takeo Sasai, Fukutaro Hamaoka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2020

Digital Backpropagation for Optical Path Monitoring: Loss Profile and Passband Narrowing Estimation.

Takeo Sasai, Masanori Nakamura, Etsushi Yamazaki, Shuto Yamamoto, Hideki Nishizawa, Yoshiaki Kisaka

Proceedings of the European Conference on Optical Communications, 2020

2019

Dual-Carrier 1-Tb/s Transmission Over Field-Deployed Large-Core Pure-Silica-Core Fiber Link Using Real-Time Transponder.

Fukutaro Hamaoka, Takeo Sasai, Kohei Saito, Takayuki Kobayashi, Asuka Matsushita, Masanori Nakamura, Hiroki Taniguchi, Shoichiro Kuwahara, Hiroki Kawahara, Takeshi Seki, Josuke Ozaki, Yoshihiro Ogiso, Hideki Maeda, Yoshiaki Kisaka, Masahito Tomizawa

Proceedings of the 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC), 2019

Experimental Analysis of Laser Phase Noise Tolerance of Uniform 256QAM and Probabilistically Shaped 1024QAM.

Takeo Sasai, Asuka Matsushita, Masanori Nakamura, Seiji Okamoto, Fukutaro Hamaoka, Yoshiaki Kisaka

Proceedings of the Optical Fiber Communications Conference and Exhibition, 2019

2018

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.

Fukutaro Hamaoka, Kyo Minoguchi, Takeo Sasai, Asuka Matsushita, Masanori Nakamura, Seiji Okamoto, Etsushi Yamazaki, Yoshiaki Kisaka

Proceedings of the European Conference on Optical Communication, 2018