Wavefront-Matching-Method-Designed Six-Mode-Exchanger Based on Grating-Like Waveguide on Silica-PLC Platform. - Takeshi Fujisawa; Taiji Sakamoto; Masashi Miyata; Takashi Matsui; Toshikazu Hashimoto; Ryoichi Kasahara; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2020)