Sumitomo Osaka Cement Co., Ltd.

Masaaki Sudou

Junichiro Ichikawa

Katsutoshi Kondou

Masayuki Ichioka

An optical control element which has a thin plate having an electro-optical effect and a thickness of 10 &#x3bc;m or less, optical waveguides formed in the thin plate, and a plurality of optical control portions for controlling light propagating through the optical waveguide, wherein, a portion between a plurality of optical control portions is connected by a control signal wiring line that includes any one of a coplanar waveguide type disposed only on a surface of the thin plate, a coplanar waveguide type disposed on the surface of the thin plate and a ground electrode disposed on a back surface thereof, or a micro strip line, for arrival times of light and electric signal set to be substantially the same.

Optical control element having a plurality of optical control portions

To provide an optical waveguide device which can allow a light-receiving element to be precisely aligned with a diffused waveguide formed in a dielectric substrate to implement an evanescent coupling light-receiving element. An optical waveguide device includes a dielectric substrate, a diffused waveguideformed by thermally diffusing a high-refractive material into the dielectric substrate, and a light-receiving elementwhich is disposed above the diffused waveguide and which receives a part of an optical wave propagating in the diffused waveguide. Here, at least a partof a pedestalandsupporting the light-receiving element above the dielectric substrate is formed by disposing the high-refractive material in a predetermined pattern in the vicinity of the diffused waveguide and thermally diffusing the high-refractive material at the same time as forming the diffused waveguide.

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Chiyoda-ku, Japan

Masaaki Sudou