Highly Reliable and Compact InP-Based In-Phase and Quadrature Modulators for Over 400 Gbit/s Coherent Transmission Systems. - Hajime Tanaka 002; Tsutomu Ishikawa; Takashi Kitamura 002; Masataka Watanabe; Ryuji Yamabi; Ryo Yamaguchi; Naoya Kono; Takehiko Kikuchi; Morihiro Seki; Tomokazu Katsuyama; Mitsuru Ekawa; Hajime Shoji (IEICE Trans. Electron., 2020)