Patent ID: 6480647
Filing Date: 2002-11-12
Classification: G02B

Abstract:
A waveguide-type wavelength multiplexing optical transmitter/receiver module comprising:an optical demultiplexer; an optical transmitter; an optical receiver; wherein said optical demultiplexer comprises an optical waveguide substrate and a filter, said optical waveguide substrate having a first optical waveguide, a second optical waveguide and a cross section at which said first optical waveguide and said second waveguide cross each other on a first end face of said optical waveguide substrate, said first optical waveguide and said second optical waveguide being disposed in respective positions opposite to each other relative to a cross axis normal to said first end face and passing through said cross section, said first optical waveguide having a first port to connect to said optical transmitter on a second end of said optical waveguide substrate, said second optical waveguide having a second port to connect to an optical fiber; wherein said filter is disposed on said first end face of said optical waveguide substrate and reflects a first wavelength of light output from said optical transmitter such that said first wavelength of light is input to said second optical waveguide, and allows a second wavelength of light transmitted through said second optical waveguide from said optical fiber to pass through; and wherein said optical receiver is disposed such that a center axis of said optical receiver is shifted toward said first optical waveguide from said cross axis, whereby said optical receiver receives said second wavelength of light passing through said filter and avoids receiving an unwanted light output from said optical transmitter.