Ryo Koma

15 papers Journal 3Unranked 12
YearRankTypeTitle / Venue / Authors
2025 — conf
Demonstration of C-band, $50-\text{Gbit}/\mathrm{s}\times 4\lambda$ Single-Sideband-NRZ-Signal Transmission through 40-km SMF using 25G-class APD and Simple Feed-Forward Equalizer for Direct-Detection based 50G- TWDM-PON.
ECOC
Ryo Koma, Jin Uchiyama, Kazutaka Hara, Jun-ichi Kani, Tatsuya Shimada
2023 J jnl
300-GHz-Band Diplexer for Frequency-Division Multiplexed Wireless Communication.
IEICE Trans. Electron.
Yuma Kawamoto, Toki Yoshioka, Norihiko Shibata, Daniel Headland, Masayuki Fujita, Ryo Koma, Ryo Igarashi, Kazutaka Hara, Jun-ichi Kani, Tadao Nagatsuma
2022 — conf
First Demonstration of 128-Gbit/s 300-GHz-band THz Transmission Using OFC-based Transmitter and Intradyne Receiver.
OECC/PSC
Ryo Igarashi, Keita Toichi, Tsubasa Saijo, Ryo Koma, Kazutaka Hara, Jun-ichi Kani, Tomoaki Yoshida, Tadao Nagatsuma
2021 — conf
Novel EA-DFB Mode-Switching Transmitter Supporting Continuous Phase Frequency Shift Keying and Intensity Modulation for All-Photonics Network.
ECOC
Ryo Koma, Kazutaka Hara, Takuya Kanai, Junichi Kani, Tomoaki Yoshida
2021 — conf
Simultaneous Reception of ASK-based AMCC Signals and QPSK Signals with Single Coherent Receiver.
OFC
Ryo Igarashi, Ryo Koma, Kazutaka Hara, Kazuaki Honda, Junichi Kani, Tomoaki Yoshida
2018 J jnl
Burst-Mode Digital Signal Processing That Pre-Calculates FIR Filter Coefficients for Digital Coherent PON Upstream.
JOCN
Ryo Koma, Masamichi Fujiwara, Jun-ichi Kani, Ken-Ichi Suzuki, Akihiro Otaka
2018 — conf
Wide Range Carrier Frequency Offset Estimation Method using Training Symbols with Asymmetric Constellations for Burst-Mode Coherent Reception.
OFC
Ryo Koma, Masamichi Fujiwara, Ryo Igarashi, Takuya Kanai, Junichi Kani, Akihiro Otaka
2018 — conf
Wide-Range Frequency Offset Compensation for CPFSK Used as TOM-Based Digital Coherent PON's Upstream Signals.
ECOC
Takuya Kanai, Masamichi Fujiwara, Ryo Koma, Ryo Igarashi, Noriko Iiyama, Junichi Kani, Akihiro Otaka
2017 — conf
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.
ECOC
Ryo Koma, Masamichi Fujiwara, Junichi Kani, Ken-Ichi Suzuki, Akihiro Otaka
2017 J jnl
Increasing Splitting Ratio of Extended-Reach WDM/TDM-PON by Using Central Office Sited Automatic Gain Controlled SOAs.
IEICE Trans. Commun.
Masamichi Fujiwara, Ryo Koma
2017 — conf
Performance evaluation of CPFSK transmitters for TDM-based digital coherent PON upstream.
OFC
Masamichi Fujiwara, Ryo Koma, Junichi Kani, Ken-Ichi Suzuki, Akihiro Otaka
2016 — conf
Wide dynamic range burst-mode digital coherent detection using fast ALC-EDFA and pre-calculation of FIR filter coefficients.
OFC
Ryo Koma, Masamichi Fujiwara, Junichi Kani, Ken-Ichi Suzuki, Akihiro Otaka
2015 — conf
Compact bi-directional EDFAs to support extended power budget class of TWDM-PON.
ECOC
Masamichi Fujiwara, Ryo Koma, Ken-Ichi Suzuki, Akihiro Otaka
2015 — conf
High-splitting-ratio WDM/TDM-PONs using automatic gain controlled SOAs designed for central office use.
OFC
Masamichi Fujiwara, Ryo Koma, Katsuhisa Taguchi
2014 — conf
Wide dynamic range burst-mode reception of symmetrically clipped DCO-OFDM using optical domain power equalizer.
ECOC
Ryo Koma, Masamichi Fujiwara, Shunji Kimura, Naoto Yoshimoto, Hideaki Kimura