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. 14, 2010
Filed:
Aug. 27, 2008
Applicant:
Shigeaki Sekiguchi, Kawasaki, JP;
Inventor:
Shigeaki Sekiguchi, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor laser includes an optical waveguide formed on a semiconductor substrate and capable of generating gain by current injection, and a diffraction grating having a phase shift and provided along the optical waveguide over the overall length of the optical waveguide on the semiconductor substrate. The semiconductor laser is configured such that a Bragg wavelength in a region in the proximity of each of the opposite ends of the optical waveguide is longer than a Bragg wavelength in a region in the proximity of the phase shift in a state in which current injection is not performed for the optical waveguide.