800-Gbps PAM-4 O-band Transmission through 2-km SMF using 4λ LAN-WDM TOSA with MLSE Based on Nonlinear Channel Estimation and Decision Feedback. - Hiroki Taniguchi; Shuto Yamamoto; Yoshiaki Kisaka; Shigeru Kanazawa; Toshihide Yoshimatsu; Yozo Isikawa; Kazuyo Mizuno (ECOC, 2021)