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US 5,719,981 AGranted
Opto-electric device
AssigneeRicoh Company, Ltd.
InventorsIkuo Katoh, Kiyoshi Yokomori
Life of this patent
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Abstract
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.
Claims7
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.
3 more elements
Dependencies are inferred from the claim text.