Constellation Monitor of QPSK Optical Signals Based on Spectrally-sliced Coherent Optical Spectrum Analyzers. - Koji Igarashi; Naoki Urakawa (OECC/PSC, 2019)

Spectrally Slicing Coherent Optical Spectrum Analyzer for Measuring Complex Field Waveforms of Optical QAM Signals. - Yasuhiro Kawabata; Naoki Urakawa; K. Kinoshita; Koji Igarashi (OFC, 2020)