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:
Feb. 27, 1990
Filed:
Jun. 08, 1988
Applicant:
Inventors:
Toshiharu Takesue, Tokyo, JP;
Hiroyoshi Yamamoto, Tokyo, JP;
Assignee:
Seiko Instruments Inc., Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350 9615 ; 350 9616 ;
Abstract
An optical waveguide coupler comprises at least two optical waveguides such as optical fibers closely spaced apart for allowing light propagating in one optical waveguide to couple into the other. Optical waveguide portions of the waveguides are made of materials having different refractive indices respectively. The feature stabilizes the splitting ratio against a slight change in coupling length, whereby the control of the coupling ratio during manufacture becomes easy, and deviations in splitting ratio can be greatly reduced.