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:
May. 01, 1979
Filed:
Jun. 17, 1977
Applicant:
Inventor:
Yet-Zen Liu, Roanoke, VA (US);
Assignee:
International Telephone and Telegraph Corporation, Nutley, NJ (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
350 9612 ; 350 9611 ; 357 17 ; 357 19 ;
Abstract
A double heterostructure light emitting device has a graded index optical waveguide formed integrally therein. The integrally formed waveguide collects light from the heterojunction and directs the light in a distinct light pattern on one surface of the device. The rate of variation of the index gradient within the waveguide region determines the geometry of the light pattern. The light output pattern can be conveniently tailored to match the geometry of a wide variety of optical fiber dimensions.