Patent ID: 8837879

Claim:
An optical waveguide device comprising: a first optical coupler branching an input light to output a first signal light and a second signal light; an optical phase shifter for giving a phase difference between the first signal light and the second signal light including: a first optical waveguide connected to the first optical coupler and propagating the first signal light; and a second optical waveguide having an optical path length different from that of an optical path length of the first optical waveguide, connected to the first optical coupler and propagating the second signal light; and a second optical coupler for coupling the first signal light outputted from the first optical waveguide and the second signal light outputted from the second optical waveguide connected to the first optical waveguide and the second optical waveguide of the optical phase shifter, wherein the first optical waveguide has a first waveguide width and is a bent optical waveguide bent in a first direction at a first radius of curvature, the second optical waveguide has a second waveguide width and is a bent optical waveguide bent in a second direction at a second radius of curvature, the first waveguide width and the second waveguide width are equal to each other, the first direction and the second direction are the same, and the first radius of curvature and the second radius of curvature are the same, wherein a bend angle of the first optical waveguide and a bend angle of the second optical waveguide are different from each other.