Patent ID: 6829080
Filing Date: 2004-12-07
Classification: G02B,G02F,G11B,H01S

Abstract:
An optical waveguide device comprising:a substrate; an optical waveguide formed in the vicinity of a surface of the substrate; and an optical thin film formed in at least a portion of the optical waveguide or formed in contact with at least a portion of the optical waveguide, wherein a plurality of guided waves with different wavelengths propagate in the optical waveguide, a portion of the guided waves that exits from the optical waveguide returns to the optical waveguide again, and the optical thin film prevents reflection of light returning to the optical waveguide from end faces of the optical waveguide or in the vicinity thereof, wherein fundamental light and harmonic light propagate in the optical waveguide, a harmonic light absorption region that comprises the optical thin film and absorbs the harmonic light is provided in the vicinity of an entrance end face of the optical waveguide, and the fundamental light propagates in the harmonic light absorption region and a harmonic light non-absorption region that does not absorb the harmonic light in the optical waveguide, and waveguide mode sizes of the fundamental light in the two regions substantially match.