60Gbit/s 64 QAM-OFDM coherent optical transmission with a 5.3GHz bandwidth. - Tatsunori Omiya; Seiji Okamoto; Keisuke Kasai; Masato Yoshida; Masataka Nakazawa (IEICE Electron. Express, 2010)

256 QAM Digital Coherent Optical Transmission Using Raman Amplifiers. - Masato Yoshida; Seiji Okamoto; Tatsunori Omiya; Keisuke Kasai; Masataka Nakazawa (IEICE Trans. Commun., 2011)

Adaptive pre-equalization using bidirectional pilot sequences to estimate and feed back amplitude transfer function and chromatic dispersion. - Seiji Okamoto; Mitsuteru Yoshida; Kazushige Yonenaga; Tomoyoshi Kataoka (OFC, 2015)

Mode and polarization division multiplexed signal detection with single coherent receiver using mode-selective coherent detection technique. - Fukutaro Hamaoka; Seiji Okamoto; Kengo Horikoshi; Kazushige Yonenaga; Akira Hirano; Yutaka Miyamoto (OFC, 2016)

Field experiment of OSNR-aware adaptive optical transmission with pilot-aided bidirectional feedback channel. - Seiji Okamoto; Kazushige Yonenaga; Fukutaro Hamaoka; Yoshiaki Kisaka (OFC, 2016)

Experimental Demonstration of Simplified Adaptive Equalizer for Fractionally Sampled 120-GBaud Signal. - Fukutaro Hamaoka; Seiji Okamoto; Masanori Nakamura; Asuka Matsushita; Takayuki Kobayashi; Hiroshi Yamazaki; Munehiko Nagatani; Yoshiaki Kisaka; Akira Hirano; Yutaka Miyamoto (ECOC, 2017)

400Gbit/s/ch Field Demonstration of Modulation Format Adaptation Based on Pilot-Aided OSNR Estimation Using Real-Time DSP. - Seiji Okamoto; Kazushige Yonenaga; Kengo Horikoshi; Mitsuteru Yoshida; Yutaka Miyamoto; Masahito Tomizawa; Takeshi Okamoto; Hidemi Noguchi; Jun-ichi Abe; Junichiro Matsui; Hisao Nakashima; Yuichi Akiyama; et al. (IEICE Trans. Commun., 2017)

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 (ECOC, 2018)

Adaptive Compensation for SOA-Induced Nonlinear Distortion with Training-Based Estimation of SOA Device Parameters. - Fukutaro Hamaoka; Seiji Okamoto; Masanori Nakamura; Asuka Matsushita; Yoshiaki Kisaka (ECOC, 2018)

Transmission Technologies Beyond 400-Gbps/Carrier Employing High-Order Modulation Formats. - Asuka Matsushita; Masanori Nakamura; Fukutaro Hamaoka; Seiji Okamoto (ECOC, 2018)

Spectrally Efficient 800 Gbps/Carrier WDM Transmission with 100-GHz Spacing Using Probabilistically Shaped PDM-256QAM. - Masanori Nakamura; Asuka Matsushita; Seiji Okamoto; Fukutaro Hamaoka; Yoshiaki Kisaka (ECOC, 2018)

Experiments on Stimulated Raman Scattering in S- and L-bands 16-QAM Signals for Ultra-Wideband Coherent WDM Systems. - Kyo Minoguchi; Seiji Okamoto; Fukutaro Hamaoka; A. Matsushita; Masanori Nakamura; Etsushi Yamazaki; Yoshiaki Kisaka (OFC, 2018)

Observation of Guided Acoustic-Wave Brillouin Scattering and its Digital Compensation in Coherent QAM Transmission. - Masataka Nakazawa; Masaki Terayama; Seiji Okamoto; Masato Yoshida; Keisuke Kasai; Toshihiko Hirooka (OFC, 2018)

Laser Phase Noise Tolerance of Probabilistically-Shaped Constellations. - Seiji Okamoto; Fukutaro Hamaoka; Masanori Nakamura; Yoshiaki Kisaka (OFC, 2018)

Experimental and Numerical Comparison of Probabilistically-Shaped 4096 QAM and Uniformly-Shaped 1024 QAM in All-Raman Amplified 160 km Transmission. - Seiji Okamoto; Masaki Terayama; Masato Yoshida; Keisuke Kasai; Toshihiko Hirooka; Masataka Nakazawa (OFC, 2018)

4096 QAM (72 Gbit/s) Single-Carrier Coherent Optical Transmission with a Potential SE of 15.8 bit/s/Hz in All-Raman Amplified 160 km Fiber Link. - Masaki Terayama; Seiji Okamoto; Keisuke Kasai; Masato Yoshida; Masataka Nakazawa (OFC, 2018)

64-GBd PDM-256QAM and 92-GBd PDM-64QAM Signal Generation using Precise-Digital-Calibration aided by Optical-Equalization. - Asuka Matsushita; Masanori Nakamura; Kengo Horikoshi; Seiji Okamoto; Fukutaro Hamaoka; Yoshiaki Kisaka (OFC, 2019)

1.04 Tbps/Carrier Probabilistically Shaped PDM-64QAM WDM Transmission Over 240 km Based on Electrical Spectrum Synthesis. - Masanori Nakamura; Fukutaro Hamaoka; Munehiko Nagatani; Hiroshi Yamazaki; Takayuki Kobayashi; Asuka Matsushita; Seiji Okamoto; Hitoshi Wakita; Hideyuki Nosaka; Yutaka Miyamoto (OFC, 2019)

Low Complexity Sub-Band Digital Back Propagation. - Seiji Okamoto; Kengo Horikoshi; Masanori Nakamura; Asuka Matsushita; Fukutaro Hamaoka; Yoshiaki Kisaka (OFC, 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 (OFC, 2019)

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 (OFC, 2020)

Low-Complexity SD-FEC based on Channel-Polarized Multistage Codes for Data Center Networks. - Takeshi Kakizaki; Masanori Nakamura; Fukutaro Hamaoka; Seiji Okamoto; Etsushi Yamazaki (OFC, 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; et al. (CoRR, 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; et al. (J. Opt. Commun. Netw., 2024)

Fast WDM provisioning with minimal probing: the first field experiments for DC exchanges. - Hideki Nishizawa; Toru Mano; Thomas Ferreira de Lima; Yue-Kai Huang; Zehao Wang; Wataru Ishida; Masahisa Kawashima; Ezra Ip; Andrea D'Amico; Seiji Okamoto; Takeru Inoue; Kazuya Anazawa; et al. (J. Opt. Commun. Netw., 2024)