We experimentally evaluate the high-speed on–off keying (OOK) and four-level pulse amplitude modulation (PAM4) transmitter’s performance in C-band for short-reach optical interconnects. demonstrate up to 100 Gbaud OOK PAM4 transmission over a 400 m standard single-mode fiber with monolithically integrated externally modulated laser (EML) having GHz 3 dB bandwidth 2 ripple. its capabilities enab...