Optical waveguide device and optical modulation device and optical transmission apparatus using the same

Abstract

An optical waveguide device achieves both improvement of electric field efficiency and suppression of the pyroelectric effect. The optical waveguide device is composed of a ferroelectric material and includes an optical waveguide substrate (1) having an optical waveguide (WG), and control electrodes (E1, E2) that apply an electric field to the optical waveguide, in which the optical waveguide is formed in a part of a convex section (10) formed on a surface of the optical waveguide substrate, a buffer layer (BF) and a charge diffusion layer (CD) that cover the optical waveguide are formed in order, and the control electrodes are disposed in contact with the optical waveguide substrate.

Dependencies are inferred from the claim text.