Patent ID: 6925228

Claim:
An optical waveguide circuit including a first optical waveguide comprising a cladding and a core, and a set of second optical waveguides comprising a plurality of optical waveguides, which each comprise a cladding and a core, and intersect with the first optical waveguide successively, said first optical waveguide comprising: an intersecting section at which said first optical waveguide intersect with said set of the second optical waveguides; a tapered section at which a core width is varied before and after said intersecting section; and an input terminal section and an output terminal section for inputting and outputting lightwave, wherein at least one of a core width and a core height of said intersecting section differs from corresponding one of a core width and a core height of said input and output terminal sections, and wherein a core width of said tapered section varies smoothly between said intersecting section and said input and output sections, and wherein the individual waveguides included in said set of the second optical waveguides intersect with said first optical waveguide at a fixed interval.