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:
Feb. 29, 2000
Filed:
May. 20, 1997
Applicant:
Inventor:
Junichi Kinoshita, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 46 ; 257 79 ;
Abstract
A burying-heterostructure (BH) type semiconductor laser having a constricted mesa which has an active region. The laser has two spaces, located above and below the active region, for constricting a current to reduce a leakage current. The laser further has a first group of columns extending through the space located above the active region, and a second group of columns extending through the space located below the space. The columns of the first group are staggered in a vertical plane, with respect to the columns of the second group.