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:
Mar. 21, 1989
Filed:
Mar. 07, 1988
Applicant:
Inventors:
Masashi Usami, Tokyo, JP;
Shigeyuki Akiba, Tokyo, JP;
Katsuyuki Utaka, Musashino, JP;
Yuichi Matsushima, Tanashi, JP;
Assignee:
Kokusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 50 ; 357 19 ; 372 29 ; 372 49 ; 372 96 ;
Abstract
A distributed feedback semiconductor laser with monitor is disclosed, in which the energy gap of a light absorbing layer provided on the window region alone is smaller than the energy gap of the light emitting layer, and in which an independent pn junction isolated from the pn junction in the laser region is provided in or at one edge of the light absorbing layer on the window region.