PLC-type LP11 mode rotator with single-trench waveguide for mode-division multiplexing transmission. - Takui Uematsu; Nobutomo Hanzawa; Kunimasa Saitoh; Yuhei Ishizaka; Kouhei Masumoto; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto (OFC, 2014)