Abstract: A WDM optical transmit-receive device comprises an optical transceiver assembly and an optical receiver assembly. The optical transceiver assembly includes a first optical platform, a first optical filter, a first photodetector and a laser diode, where the first optical platform has a first surface and a first groove recessed from the first surface, the first optical filter is inserted into the first groove, the first photodetector and the laser diode are mounted adjacent to the first optical filter.