Patent ID: 7251390
Filing Date: 2007-07-31
Classification: G02B,G02F

Abstract:
1. A planar waveguide device comprising: an Si substrate; an insulating layer provided on said Si substrate; a plurality of Si optical waveguides aligned substantially in parallel to each other on one main surface of said insulating layer; and a heater for controlling gradient of temperature distribution of said Si substrate in a direction in which said plurality of Si optical waveguides are aligned; wherein said heater is provided on one side end surface of said Si substrate in the direction in which said plurality of Si optical waveguides are aligned, heat generated by said heater conducts from said one side end surface of said Si substrate toward another side end surface opposed to said one side end surface, and said Si substrate has thermal resistance greater than 20 K/W and lower than 2000 K/W, between said one side end surface and said another side end surface.