4×25-Gbit/s EADFB laser array monolithically integrated with cascaded Mach-Zhender multiplexer

A 4×25-Gbit/s EADFB laser array chip monolithically integrated with a cascaded Mach-Zhender multiplexer is developed for CFP4-class 100GbE transmitters for the first time. Our compact TOSA containing this chip satisfies system requirements with semi-cooled operation.