Patent ID: 8391651

Claim:
An optical waveguide device comprising: a thin plate having a thickness of 20 μm or less; and at least an optical waveguide formed by diffusing in the thin plate, wherein the thin plate is bonded and fixed to a supporting substrate with a bonding layer interposed therebetween, and a film having a high refractive index which is higher than a refractive index of the thin plate and the bonding layer is provided on a surface of the thin plate bonded and fixed to the supporting substrate so as to be in contact with a part of the optical waveguide, and the bonding layer surrounds all other sides of the film, the film having the high refractive index has a strip line shape, and forms an optical waveguide having the film having the high refractive index as a core, a width of the strip line shape of the film in a direction perpendicular to a guiding direction of the optical waveguide is the same as a width of the optical waveguide in the direction perpendicular to the guiding direction of the optical waveguide, at least a part of light waves propagating in the optical waveguide formed in the thin plate propagates inside the film having the high refractive index and having the strip line shape, and the film having the high refractive index and having the strip line shape is configured so as to be separated from said optical waveguide, with a part of said optical waveguide being in contact with the film having the high refractive index and having the strip line shape.