Patent ID: 9720177
Date: 2017-08-01
CPC Classifications: G02B

Claim:
1. An optical phase diversity receiver for coherent optical communication, comprising: a diffraction grating including a plurality of grating surfaces, wherein every predetermined number of grating surfaces are chirped in an identical manner; a first input waveguide to which a first optical signal is inputted; a second input waveguide to which a second optical signal is inputted; and a slab waveguide including an input terminal optically coupled with the first and second input waveguides, and an output terminal provided at a position at which optical signals reflected by the diffraction grating reach the slab waveguide, the slab waveguide being configured to guide the first and second optical signals received on the input terminal to the diffraction grating and guide the optical signals reflected by the diffraction grating to the output terminal, wherein the plurality of grating surfaces are configured such that each of the optical signals reflected by the diffraction grating is divided into the predetermined number by optical power distribution.