Publications
2021.01.11
Journal articles
- 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, 2024, early access.
- 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, 2024, early access.
- 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, 2024, early access.
- 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.
- (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.
- 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.
- (Invited)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.
- (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.
- 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.
- (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.
Conference
- (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.
- (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.
- (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.
- (Invited)T. Sasai, “Digital Longitudinal Monitoring of Fiber-Optic Link,” in Photonics West 2024, San Francisco, USA, 12894-20, 2024.
- 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.
- 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.
- 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.
- 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.
- (Best paper)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
- 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.
- 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.
- (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.
- 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.
- 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.
- (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.
- 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.
- 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.
- 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.
- (Extended 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.
- 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
- (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.
- 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.
- 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
General magazine
Preprint
- 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.
- T. Sasai, E. Yamazaki, and Y. Kisaka, “Performance limit of Fiber-Longitudinal Power Profile Estimation Methods,” arXiv preprint, arXiv:2211.08128, 2022.
- 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.
- 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.
- 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.
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