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:
Jul. 04, 2006
Filed:
Feb. 14, 2003
Yutaka Ohki, Tokyo, JP;
Naoki Tsukiji, Tokyo, JP;
Junji Yoshida, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention has a lower cladding layer, a lower SCH layer, a quantum well layer, an upper SCH layer, and a first upper cladding layer sequentially laminated on a substrate. A striped-pattern second upper cladding layer that has a longitudinal direction in a laser beam emission direction, and a current blocking layer are laminated on the first upper cladding layer. A third upper cladding layer and a contact layer are laminated sequentially on the second upper cladding layer and the current blocking layer respectively. The current blocking layer has a conduction type different from that of the second upper cladding layer. An effective index of an area that includes the current blocking layer is lower than the same of an area that includes the upper cladding layer.