There is disclosed a waveguide-type wavelength multiplexing optical transmitter/receiver module which is composed of an optical demultiplexer having an optical waveguide substrate and a filter disposed on an optical waveguide substrate, a laser diode and a photodiode. On the optical waveguide substrate,...http://www.google.de/patents/US6480647?utm_source=gb-gplus-sharePatent US6480647 - Waveguide-type wavelength multiplexing optical transmitter/receiver module
