Patent ID: 8483523

Claim:
An optical waveguide electro-optic device, comprising: a support substrate; an optical waveguide which has a core layer formed of a ferroelectric material, and is formed on an upper side of the support substrate; a lower electrode layer formed on a lower side of the core layer and which is adhered to the support substrate through an adhesion layer; an upper electrode layer formed on an upper side of the core layer; and an external electrode part, wherein the optical waveguide has an incidence plane from where light enters and an outgoing plane from where the light exits, the core layer has a plurality of polarization inversion regions and a plurality of polarization non-inversion regions, the polarization inversion regions and the polarization non-inversion regions being arranged alternately from the incidence plane toward the outgoing plane, the upper electrode layer has a shape such that an area of each of the plurality of polarization inversion regions expands as going to the outgoing plane, and the lower electrode layer is connected electrically to the external electrode part on a side of the incidence plane.