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:
Jun. 14, 1994
Filed:
Dec. 16, 1992
Applicant:
Inventors:
Junichi Kinoshita, Yokohama, JP;
Kazuaki Otsuka, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 96 ; 372 46 ; 372 45 ; 372 87 ;
Abstract
A distributed feedback semiconductor laser comprises a semiconductor substrate, a waveguiding structure, provided on the semiconductor substrate, including a diffraction grating, an active layer and a top layer for ohmic contact, a first electrode provided on the top layer, a second electrode attached to the semiconductor substrate, and means for compensating spatial nonuniformity of a carrier density caused by spatial hole burning. The means changes an electrical resistance between the first electrode and the active layer, corresponding to a spatial distribution of photon density along the waveguiding structure.