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:
Sep. 17, 2002
Filed:
Jul. 29, 1999
Applicant:
Inventor:
Mizuyuki Ushirozawa, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 3/10 ;
U.S. Cl.
CPC ...
H01S 3/10 ;
Abstract
A light source in which a signal light having a wavelength outside a normal tolerance is not supplied to the outside of the light source. A temperature control circuit controls an optical switch so that the signal light outputted from a laser diode (LD) module is not supplied to the outside unless a temperature of the LD comes to be within the normal tolerance. An LD-driving circuit supplies a current to the LD in the LD module, and controls a light power outputted from the LD.