Patent ID: 8457459

Claim:
An arrayed-waveguide-grating-type optical multiplexer/demultiplexer, comprising: a waveguide chip including a first waveguide chip and a second waveguide chip that are divided by a cut plane and obtained by cutting, together with a substrate, in a direction crossing an optical axis, a first slab waveguide of an arrayed waveguide grating including the first slab waveguide and a second slab waveguide that are formed on the substrate, an external form of the waveguide chip being curved-line shaped following an outline of the arrayed waveguide grating formed on the substrate; a first base to which the first waveguide chip is fixed; a second base separated from the first base and to which the second waveguide chip is fixed; and a compensation member that has one end fixed to the first base or the first waveguide chip and another end fixed to the second base, in a state in which a cut surface of the first waveguide chip and a cut surface of the second waveguide chip face each other, and that is configured to move the first base and the second base relatively to each other along the cut plane by expanding or contracting when temperature changes.