Patent ID: 8031986

Claim:
An optical control device comprising: a substrate having an electrooptic effect; a plurality of optical waveguides formed in the substrate in parallel to one another; and a polarization inversion region which is disposed on a part of the substrate and which has a polarization characteristic that is an inverse to that of the substrate, wherein a profile of a boundary between the polarization inversion region and a remaining region in which the polarization is not inverted is configured such that the respective waveguides has accumulated amounts of distortion, which comprises a distortion component caused by lattice distortion generated at the boundary in accordance with a variation in temperature to affect the respective waveguides by causing a variation in refractive index and a distortion component caused by a factor other than the lattice distortion, that affects the respective waveguides over coordinates along the light propagation direction which accumulated amounts of distortion are substantially identical to one another.