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:
Jul. 21, 2009
Filed:
Dec. 27, 2004
Applicant:
Koji Otsubo, Kawasaki, JP;
Inventor:
Koji Otsubo, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 3/098 (2006.01); H01S 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The optical semiconductor device comprises a lower clad layer, optical waveguide layersincluding an active layer for recombining the carriers. The upper clad layeris mesa stripe configuration having a first mesa portion contacting the contact layerand having a first width, and a second mesa portion having a second width larger than the first width. The first width, the second width and the thickness of the second mesa portion are set not to oscillate in the higher-order transverse mode.