Wide-Temperature-Range (25°C to 80°C) 53-Gbaud PAM4 (106-Gb/s) Operation of 1.3-µm Directly Modulated DFB Lasers for 10-km Transmission. - Noriko Sasada; Takayuki Nakajima; Yuji Sekino; Akira Nakanishi; M. Mukaikubo; M. Ebisu; Masatoshi Mitaki; Shigenori Hayakawa; Kazuhiko Naoe (ECOC, 2018)