Patent ID: 7627212

Claim:
An optical integrated device, comprising: an optical waveguide structure formed on a semiconductor substrate and including a plurality of first channel optical waveguide portions, an optical coupler portion and a second channel optical waveguide portion connected to said plural first channel optical waveguide portions through said optical coupler portion; a plurality of dummy structure bodies being discretely provided over a desired region in the proximity of at least an output side of said optical coupler portion; a semi-insulating semiconductor burying layer formed from a semi-insulating semiconductor material and formed around said optical waveguide structure and said dummy structure bodies such that an upper portion thereof forms a flat face having a predetermined width and a side portion thereof forms an inclined face having a predetermined angle with respect to said semiconductor substrate; and a waveguide, formed from said semi-insulating semiconductor burying layer formed around said plurality of dummy structure bodies, guiding radiation light from said optical coupler portion toward a face other than an output end face outputting signal light which propagates along said first channel optical waveguide portions or said second channel optical waveguide portions.