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. 02, 1997
Filed:
Nov. 04, 1996
Applicant:
Inventor:
Hirohito Yamada, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257 94 ; 257 95 ; 257 96 ; 257 97 ; 257 98 ; 372 45 ; 372 46 ; 372 47 ; 372 48 ; 372 49 ;
Abstract
An active layer 102 and a clad layer 103 are formed on a semiconductor substrate 101. The active layer including an optical guide layer and an optical confinement layer/formed so that the thickness of the active layer gradually decreases toward a light-emission-side end facet. Since a spot size is gradually expanded toward an emission end, the radiation angle of an emitted beam is narrowed and characteristics including a threshold current become superior.