Patent ID: 9726822
Date: 2017-08-08
CPC Classifications: G02B,G02F

Claim:
1. An optical integrated circuit comprising: a first optical waveguide that guides light in an arbitrary polarization state; a mode conversion and branching section that is connected to an output end of the first optical waveguide, launches light in a TE an optical multiplexing and branching section that is connected to the second optical waveguide and the third optical waveguide, multiplexes light from the second optical waveguide and light from the third optical waveguide into one multiplexed light component, and branches the multiplexed light component into a light component to be input to a fourth optical waveguide and a light component to be input to a fifth optical waveguide; a phase modulation section that is provided in at least one of the fourth optical waveguide and the fifth optical waveguide and is configured to modulate a phase of guided light using an electric signal; and an optical multiplexing section that is connected to the fourth optical waveguide and the fifth optical waveguide and multiplexes light components from the fourth optical waveguide and the fifth optical waveguide into one light component.