The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 05, 1989
Filed:
Nov. 18, 1988
Applicant:
Inventors:
Takashi Ushikubo, Tokyo, JP;
Hideaki Okayama, Tokyo, JP;
Masato Kawahara, Tokyo, JP;
Issei Asabayashi, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350 9613 ; 350 9612 ;
Abstract
In an electro-optic distributed coupler switch having a parallel rib geometry, a coupling enhancement region formed of the same material as the upper cladding layers but of lower step height is located between the ribs. By increasing the electric field strength, the coupling enhancement region enables the coupling length L.sub.c to be reduced.