Riu Hirai

17 papers Journal 1Unranked 16
YearRankTypeTitle / Venue / Authors
2024 — conf
Optical Single-Sideband (SSB) Conversion Technique Using Phase Modulator for High-Speed Short-Reach IM/DD PAM Signaling.
OFC
Nobuhiko Kikucih, Riu Hirai, Takahito Tanimura
2023 J jnl
Physical Status Representation in Multiple Administrative Optical Networks by Federated Unsupervised Learning.
IEICE Trans. Commun.
Takahito Tanimura, Riu Hirai, Nobuhiko Kikuchi
2022 — conf
Faster-Than-Nyquist IM/DD THP-PAM4 Signaling Using Directly-Modulated Laser with Laser Non-Linear Skew Compensation.
OECC/PSC
Nobuhiko Kikuchi, Riu Hirai, Takahito Tanimura
2022 — conf
Optical Status Representation by Collaborative and Unsupervised Learning.
OECC/PSC
Takahito Tanimura, Riu Hirai, Nobuhiko Kikuchi
2021 — conf
Application of Generalized THP for Arbitrary PAM Level Design in Short-Reach IM/DD Signalling.
ECOC
Nobuhiko Kikuchi, Riu Hirai
2020 — conf
Proposal of LUT-based transmitter nonlinearity compensator with precursor compensation for Short-Reach IM/DD PAM Signalling with Tomlinson-Harashima Precoding (THP).
ECOC
Nobuhiko Kikuchi, Riu Hirai
2019 — conf
BER Improvement of IM/DD Higher-Order Optical PAM Signal with Precise Non-Linearity Compensation.
OFC
Nobuhiko Kikuchi, Riu Hirai, Takayoshi Fukui
2018 — conf
Application of Tomlinson-Harashima Precoding (THP) for Short-Reach Band-Limited Nyquist PAM and Faster-Than-Nyquist PAM Signaling.
OFC
Nobuhiko Kikuchi, Riu Hirai, Takayoshi Fukui
2018 — conf
Modulator Non-Linearity Compensation in Tomlinson-Harashima Precoding (THP) for Short-Reach Nyquist- and Faster-than-Nyquist (FTN) IM/DD PAM Signaling.
ECOC
Nobuhiko Kikuchi, Riu Hirai, Takayoshi Fukui, Shigehiro Takashima
2018 — conf
Superior BER Transmission of 106-Gb/s/lane Skewless PAM4 over 10 km by Utilizing 1.3-μm Directly Modulated InGaAlAs-MQW BH Lasers and Incoherent Multiplexing of Two NRZ Signals.
OFC
Kouji Nakahara, Riu Hirai, Takeshi Kitatani, Nobuhiko Kikuchi, Takayoshi Fukui, Kaoru Okamoto, Yasushi Sakuma, Kohichi Robert Tamura, Shigehisa Tanaka
2017 — conf
High-spectral efficiency DWDM transmission of 100-Gbit/s/lambda IM/DD single sideband-baseband-Nyquist-PAM8 signals.
OFC
Riu Hirai, Nobuhiko Kikuchi, Takayoshi Fukui
2016 — conf
Quasi single-sideband (SSB) IM/DD Nyquist PAM signaling for high-spectral efficiency DWDM transmission.
OFC
Nobuhiko Kikuchi, Riu Hirai, Takayoshi Fukui
2015 — conf
Experimental demonstration of 100G/lambda Nyquist-PAM4 transmission with digital pre-equalization of chromatic dispersion for extended-reach 400GbE.
OFC
Riu Hirai, Nobuhiko Kikuchi
2015 — conf
FPGA prototyping of single-polarization 112-Gbit/s optical transceiver for optical multilevel signaling with delay detection.
ECOC
Nobuhiko Kikuchi, Takashi Yano, Riu Hirai
2015 — conf
Practical implementation of 100-Gbit/s/lambda optical short-reach transceiver with Nyquist PAM4 signaling using electroabsorptive modulated laser (EML).
OFC
Nobuhiko Kikuchi, Riu Hirai, Takayoshi Fukui
2014 — conf
High-speed optical 64QAM signal generation using InP-based semiconductor IQ modulator.
OFC
Nobuhiko Kikuchi, Riu Hirai, Yuki Wakayama
2014 — conf
Intensity-modulated / direct-detection (IM/DD) Nyquist pulse-amplitude modulation (PAM) signaling for 100-Gbit/s/λ optical short-reach transmission.
ECOC
Nobuhiko Kikuchi, Riu Hirai