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, 2001
Filed:
Aug. 26, 1997
Applicant:
Inventor:
Takashi Tsubota, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 3/79 ;
U.S. Cl.
CPC ...
H01S 3/79 ;
Abstract
A semiconductor laser emits light through a front end and a rear end, the front end being coupled to an application system. The front end has a higher reflectivity than the rear end, to reduce problems caused by returning light. More light is therefore emitted through the rear end than through the front end. In a light source, the light emitted through the rear end is monitored by an optical detector coupled to a control circuit, which controls the voltage applied to the semiconductor laser.