Patent ID: 7133580

Claim:
A manufacturing method for an optical waveguide device, comprising: forming an optical waveguide in a substrate having an electro-optic effect, said substrate having upper, lower, and side surfaces; forming an SiO 2 film on said substrate; forming silicon (Si) films on said SiO 2 film, the lower surface of said substrate, and at least a part of the side surface of said substrate to thereby make a conduction between said Si films formed on said SiO 2 film and said Si films formed on the lower surface of said substrate; applying a photoresist to said Si films formed on said SiO 2 film; patterning said photoresist so that a portion of said photoresist corresponding to said optical waveguide is left attached on said Si films; forming a groove on said substrate along said optical waveguide by reactive ion etching; and removing said photoresist and said Si films.