Polyimide optical waveguide

US5108201A · kind A · utility

Assignee

• NIPPON TELEGRAPH AND TELEPHONE CORPORATION · JP

Inventors

• Toru Matsuura · Cincinnati, US
• Shiro Nishi · Tokyo, JP
• Shigekuni Sasaki · Iruma, JP
• Toshihiro Ichino · Hoya, DE
• Fumio Yamamoto · Sano, JP
• Shinji Ando · Tokyo, JP
• Fusao Shimokawa · Yokohama, JP
• Shinji Koike · Tokyo, JP

Key dates

• Filing date: Apr 26, 1991
• Grant date: Apr 28, 1992
• Expiry date: Apr 26, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2006/12076
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An optical waveguide which has properties including low optical losses, facile fabrication, controllable core-cladding refractive index ratio, and a high heat resistance is provided. The optical waveguide for light transmission therethrough has a core made of a polyimide obtained from at least one tetracarboxylic acid dianhydride and at least one diamine. The polyimide is (a) a polyimide homopolymer derived from a diamine represented by formula [I] as follows: ##STR1## (b) a polyimide copolymer derived from at least one diamine including the diamine represented by the formula [I]; or (c) a mixture of the polyimide homopolymers.