Katoh, Ikuo; Yokomori, Kiyoshi;

Opto-electric device

An optical integrated circuit for preventing unnecessary optical waves from outside or scattered in a waveguide. The optical integrated circuit has an substrate, a wave guide which has a core layer and at least a clad layer formed on the substrate, in which an optical wave is guided and transmitted, and a cover layer of which material has a high optical wave absorption ratio, which is formed on the waveguide partially or entirely.

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What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. An opto-electric device comprising:

a substrate;

a waveguide capable of guiding and transmitting an optical wave which comprises a core layer and at least one clad layer formed on said substrate; and

a cover layer having a high optical wave absorption ratio, and which is formed on said waveguide either partially or entirely,

wherein said cover layer comprises a high molecular weight compound and a dye,

wherein said high molecular weight compound is a polymethyl methacrylate and said dye is an azo dye.

2. The device of claim 1, wherein the refractive index of the cover layer is almost or exactly same as that of the clad layer.

3. The device of claim 1, wherein the high molecular weight compound contains minute particles having a of high optical wave absorption ratio.

4. The device of claim 3, wherein the minute particles are carbon black.

5. The device of claim 1, wherein the high molecular compound has a micro-structure.

6. The device of claim 5, wherein the micro-structure comprises hollow voids.

7. The device of claim 1, further comprising a glue layer formed between the cover layer and said at least one clad layer.