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. 08, 1994
Filed:
Nov. 18, 1992
Applicant:
Inventor:
Tetsuya Yagi, Itami, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 96 ; 372 46 ;
Abstract
A gain coupled distributed feedback semiconductor laser device includes regions with a predetermined period in an active layer or a cladding layer on the active layer in such a manner that a perturbation in the distribution of charge carriers injected into the active layer is produced which results in a perturbation in gain coefficient without increasing internal loss. The structure produces single-longitudinal-mode oscillation.