Patent ID: 7729580

Claim:
A waveguide type optical device, comprising: a substrate having a surface immediately upon which a waveguide core is formed; a supplemental plate connected on the substrate by using an adhesive; and a groove forming part formed by cutting through the supplemental plate so as to reach the substrate and cut the waveguide core, the groove forming part being where a functional thin film is inserted; wherein the supplemental plate and the waveguide core adhere to each other; a convex part is formed in at least one of a position of the substrate excluding a forming position of the waveguide core; a concave part is formed in a position, facing the convex part, of the supplemental plate; a height of the convex part is greater than a depth of the concave part; a width of the convex part is equal to or smaller that a width of the concave part; a width direction of the convex part is the same as a width direction of the waveguide core; and the adhesive is provided in concave part so that the substrate and the supplemental plate are adhered to and fixed to each other.