Wide dynamic range burst-mode reception of symmetrically clipped DCO-OFDM using optical domain power equalizer. - Ryo Koma; Masamichi Fujiwara; Shunji Kimura; Naoto Yoshimoto; Hideaki Kimura 002 (ECOC, 2014)

Compact bi-directional EDFAs to support extended power budget class of TWDM-PON. - Masamichi Fujiwara; Ryo Koma; Ken-Ichi Suzuki; Akihiro Otaka (ECOC, 2015)

High-splitting-ratio WDM/TDM-PONs using automatic gain controlled SOAs designed for central office use. - Masamichi Fujiwara; Ryo Koma; Katsuhisa Taguchi (OFC, 2015)

Wide dynamic range burst-mode digital coherent detection using fast ALC-EDFA and pre-calculation of FIR filter coefficients. - Ryo Koma; Masamichi Fujiwara; Junichi Kani; Ken-Ichi Suzuki; Akihiro Otaka (OFC, 2016)

High Sensitivity and Wide Dynamic Range Burst-Mode Coherent Receiver that Controls Gains of a SOA and TIAs for Long-Reach and High-Splitting-Ratio PON. - Ryo Koma; Masamichi Fujiwara; Junichi Kani; Ken-Ichi Suzuki; Akihiro Otaka (ECOC, 2017)

Performance evaluation of CPFSK transmitters for TDM-based digital coherent PON upstream. - Masamichi Fujiwara; Ryo Koma; Junichi Kani; Ken-Ichi Suzuki; Akihiro Otaka (OFC, 2017)

Increasing Splitting Ratio of Extended-Reach WDM/TDM-PON by Using Central Office Sited Automatic Gain Controlled SOAs. - Masamichi Fujiwara; Ryo Koma (IEICE Trans. Commun., 2017)

Wide-Range Frequency Offset Compensation for CPFSK Used as TOM-Based Digital Coherent PON's Upstream Signals. - Takuya Kanai; Masamichi Fujiwara; Ryo Koma; Ryo Igarashi 001; Noriko Iiyama; Junichi Kani; Akihiro Otaka (ECOC, 2018)

Wide Range Carrier Frequency Offset Estimation Method using Training Symbols with Asymmetric Constellations for Burst-Mode Coherent Reception. - Ryo Koma; Masamichi Fujiwara; Ryo Igarashi 001; Takuya Kanai; Junichi Kani; Akihiro Otaka (OFC, 2018)

Burst-Mode Digital Signal Processing That Pre-Calculates FIR Filter Coefficients for Digital Coherent PON Upstream. - Ryo Koma; Masamichi Fujiwara; Jun-ichi Kani; Ken-Ichi Suzuki; Akihiro Otaka (JOCN, 2018)

Novel EA-DFB Mode-Switching Transmitter Supporting Continuous Phase Frequency Shift Keying and Intensity Modulation for All-Photonics Network. - Ryo Koma; Kazutaka Hara; Takuya Kanai; Junichi Kani; Tomoaki Yoshida (ECOC, 2021)

Simultaneous Reception of ASK-based AMCC Signals and QPSK Signals with Single Coherent Receiver. - Ryo Igarashi 001; Ryo Koma; Kazutaka Hara; Kazuaki Honda; Junichi Kani; Tomoaki Yoshida (OFC, 2021)

First Demonstration of 128-Gbit/s 300-GHz-band THz Transmission Using OFC-based Transmitter and Intradyne Receiver. - Ryo Igarashi 001; Keita Toichi; Tsubasa Saijo; Ryo Koma; Kazutaka Hara; Jun-ichi Kani; Tomoaki Yoshida; Tadao Nagatsuma (OECC/PSC, 2022)

300-GHz-Band Diplexer for Frequency-Division Multiplexed Wireless Communication. - Yuma Kawamoto; Toki Yoshioka; Norihiko Shibata; Daniel Headland; Masayuki Fujita; Ryo Koma; Ryo Igarashi 001; Kazutaka Hara; Jun-ichi Kani; Tadao Nagatsuma (IEICE Trans. Electron., 2023)