Patent ID: 9304370
Filing Date: 2016-04-05
CPC Classification: G02B,G02F

Claim Text:
1. An optical waveguide device comprising an optical waveguide formed on a substrate, wherein the optical waveguide comprises a first branch portion which branches light into two light rays at a branch angle of 1/35 rad or more, a second branch portion and a third branch portion are arranged to be connected to each of two branched waveguides branched from the first branch portion, a radiation light guiding waveguide is arranged between the two branched waveguides of the first branch portion, and guides radiation light radiated from between the two branched waveguides at the first branch portion to the outside of the optical waveguide, and an optical termination portion which absorbs the guided radiation light or emits the guided radiation light to the outside of the substrate is arranged in a termination portion of the radiation light guiding waveguide.