Patent ID: 7200312
Filing Date: 2007-04-03
Classification: B82Y,G02B

Abstract:
1. An optical waveguide device comprising: a plurality of photonic crystal regions, each having holes arranged in a periodic array; and an optical waveguide formed between the photonic crystal regions, wherein, among the plurality of holes contained in the photonic crystal regions, a plurality of holes adjoining the optical waveguide on both sides of the optical waveguide are symmetrically arrayed with respect to a center axis which extends along a waveguiding direction of the optical waveguide; the optical waveguide includes a plurality of first portions each composed of a first material and a plurality of second portions each composed of a second material; the plurality of first portions and the plurality of second portions are periodically arranged along the waveguiding direction of the optical waveguide; each of the plurality of second portions is generally interposed between a pair of holes which are in symmetric positions with respect to the center axis; the first material is LiNbO the second material has an effective refractive index which is higher than an effective refractive index of the first material; and the center of gravity of every second portion is shifted along the waveguiding direction from a midpoint of a line interconnecting centers of the pair of holes sandwiching the second portion, and is located between a position which is 0.45 r away from the midpoint in the waveguiding direction and a position which is 0.25 r away from the midpoint in a direction opposite to the waveguiding direction, where r is a radius of each hole.