Patent ID: 7095926
Filing Date: 2006-08-22
Classification: G02F

Abstract:
1. An optical device, comprising: a substrate having an electrooptic effect; a first ridge section formed by being sandwiched between two grooves formed on said substrate; a second ridge section, positioned adjacent to said first ridge section, formed by being sandwiched between one of said two grooves and other groove formed at the outside of said second ridge section; an optical waveguide formed inside said first ridge section; an optical waveguide formed inside said second ridge section; a signal electrode formed above said first ridge section; and a ground electrode, which is formed above said substrate in a state in which said ground electrode sandwiches said signal electrode by having a gap of a predetermined interval for said signal electrode for applying reference electric potential to said signal electrode, wherein the ratio of the volume of a ground electrode portion formed at the position of said other groove to the area of opening part of said other groove is smaller than the ratio of the volume to the area of a ground electrode portion formed at the position except said other groove.