Patent ID: 7171094

Claim:
An optical waveguide device including a waveguide layer that converts a wavelength of incident light and emits converted light, the optical waveguide device comprising: a ridge waveguide provided in the waveguide layer; and slab waveguides formed on both sides of the ridge waveguide with recess portions intervening therebetween, wherein the waveguide layer satisfies a multi-mode condition for the incident light, light propagating through the ridge waveguide is in a single mode, the ridge waveguide has a periodically domain-inverted structure, the domain-inverted structure has two regions with different domain-inverted periods, the regions being provided in series in a direction of propagation of light, the incident light comprises plural wavelengths of light, first pump light and second pump light further are incident as well as the incident light, assuming that a region closer to an incident side of light out of the two regions is a first region and the other region is a second region, at the first region, the incident light is converted into difference-frequency light with respect to the first pump light, and at the second region, the difference-frequency light converted at the first region is converted into difference-frequency light with respect to the second pump light.