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:
Oct. 09, 2001
Filed:
Jan. 27, 1999
Nong Chen, Saitama, JP;
Kiyoshi Takei, Saitama, JP;
Yoshiaki Watanabe, Saitama, JP;
Kiyofumi Chikuma, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A distributed feedback semiconductor laser including a semiconductor substrate having a bottom surface and a top surface; an active layer formed on the top surface of the semiconductor substrate; a ridge stripe formed on the active layer having a first surface and extending in a first direction; a periodic structure that is periodic in the first direction; a plurality of p-type electrodes formed on the first surface of the ridge stripe; and an n-type electrode formed on the bottom surface of the semiconductor substrate. The first surface of the ridge stripe is parallel with a growth plane of the active layer, the first surface having at least two different widths in a direction perpendicular to the first direction.