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:
Nov. 05, 2002
Filed:
Nov. 15, 1999
Applicant:
Inventors:
Lars E. Eng, Fogelsville, PA (US);
Ram Jambunathan, Allentown, PA (US);
Kishore K. Kamath, Whitehall, PA (US);
Alexander Robertson, Lawrenceville, NJ (US);
Daniel Paul Wilt, Orefield, PA (US);
Assignee:
Agere Systems Guardian Corp., Orlando, FL (US);
Primary Examiner:
Int. Cl.
CPC ...
H01S 3/08 ; H01S 5/00 ;
U.S. Cl.
CPC ...
H01S 3/08 ; H01S 5/00 ;
Abstract
A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.