Patent ID: 7542646

Claim:
A method of manufacturing an optical waveguide, the method comprising: forming, on a first substrate, a waveguide core through which light propagates and with a cavity that is open in the waveguide core at the surface opposite to the surface of the first substrate in the waveguide core thickness direction; applying a first curable resin in a layer form onto a second substrate; disposing the first substrate and the second substrate such that the side of the first substrate where the waveguide core is formed and the side of the second substrate where the first curable resin is applied face each other, and so that the opening of the cavity is sealed by the first curable resin; curing the first curable resin to form a layer-form first cladding having a lower refractive index than the waveguide core; filling a second curable resin into a space surrounded by the first substrate, the second substrate, and the waveguide core; and curing the second curable resin to form a second cladding surrounding the waveguide core and having a lower refractive index than the waveguide core.