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. 20, 2001
Filed:
Mar. 18, 1999
Kei Yamamoto, Tenri, JP;
Hidenori Kawanishi, Nara, JP;
Sharp Kabushiki Kaisha, , JP;
Abstract
A gain-coupling type distributed feedback semiconductor laser device having a periodically varying gain along a cavity direction includes: a first periodic undulation formed along the cavity direction, the first periodic undulation including convex and concave portions; a semiconductor embedded layer formed on the first periodic undulation; and at least one active layer formed within the semiconductor embedded layer so as to extend along a direction which is perpendicular to the surface of a substrate, the at least one active layer being present on the concave portions of the first periodic undulation with a period which is substantially equal to a period of the first periodic undulation.