Equalizer-free 25Gb/s NRZ and 50Gb/s PAM-4 Transmission over 50-km SMF using Directly Modulated 1300nm DFB Laser. - Rih-You Chen; Cheng-Hui Dong; Yen-Hsiang Chang 002; Yang-Jeng Chen; Wei Lin; Chia-Chien Wei; Yi-Jen Chiu (OECC/PSC, 2019)