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. 24, 1987
Filed:
Apr. 21, 1983
Shigeyuki Akiba, Tokyo, JP;
Katsuyuki Utaka, Musashino, JP;
Kazuo Sakai, Tokyo, JP;
Yuichi Matsushima, Tokorozawa, JP;
501 Kokusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
Abstract
A distributed feedback semiconductor laser with a monitor, which has periodic corrugations on a light emitting layer or an adjoining layer in the direction of travel of light and performs laser oscillation by the injection of a current into said light emitting layer. In accordance with the present invention, a laser region forming said distributed feedback semiconductor laser and a monitor region for detecting the output of said laser region are disposed on the same substrate. A gap between said monitor region and said laser region is filled with a semiconductor of an energy bandgap larger than that of the light emitting layer of said laser region.