R. Hirai

High-speed optical 64QAM signal generation using InP-based semiconductor IQ modulator

N. Kikuchi, R. Hirai, Y. Wakayama, 2014, OFC 2014.

Intensity-modulated / direct-detection (IM/DD) Nyquist pulse-amplitude modulation (PAM) signaling for 100-Gbit/s/λ optical short-reach transmission

N. Kikuchi, R. Hirai, 2014, 2014 The European Conference on Optical Communication (ECOC).

Study on optical modulation amplitude of 4-level pulse amplitude modulation with electroabsorption modulator

N. Kikuchi, R. Hirai, Takayoshi Fukui, 2016, 2016 21st OptoElectronics and Communications Conference (OECC) held jointly with 2016 International Conference on Photonics in Switching (PS).

Application of Generalized THP for Arbitrary PAM Level Design in Short-Reach IM/DD Signalling

Nobuhiko Kikuchi, Riu Hirai, N. Kikuchi, 2021, 2021 European Conference on Optical Communication (ECOC).

FPGA Prototyping of Single-Polarization 112-Gb/s Transceiver for Optical Multilevel Signaling With Intensity and Delay Detection

Nobuhiko Kikuchi, Takashi Yano, Riu Hirai, 2016, Journal of Lightwave Technology.

Optical Status Representation by Collaborative and Unsupervised Learning

T. Tanimura, R. Hirai, N. Kikuchi, 2022, 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC).