Patent ID: 8111955

Claim:
An optical chip for an arrayed waveguide grating type optical multiplexer/demultiplexer circuit comprising: a projecting shape expanded toward either side at a center; two slab waveguides; an array waveguide for connecting the slab waveguides via a plurality of channel waveguides different in optical path length and curved in one direction; and at least one input/output waveguides connected to the slab waveguides, respectively, on sides opposite to the array waveguide, wherein one edge is formed into a shape projecting outward of a curve of the array waveguide by connecting a first line of two fold rotational symmetry and a second line of two fold rotational symmetry whereas another edge facing the one edge is straight, and input/output ends, at which the input/output waveguides disposed at both ends appear, are equal in width to each other.