Youopto 4.25G Series is a 4.25Gbps transmitter optical subassembly(TOSA) integrating a high speed DFB laser,a micro-TEC, thermistor,a monitor photodiode in a 9PIN XMD BOX package. It is
designed for use in small from-factor pluggable transceivers and other types of optical modules for  high-speed telecommunication and data applications。