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:
Feb. 07, 2006
Filed:
Feb. 19, 2003
Junji Yoshida, Tokyo, JP;
Naoki Tsukiji, Tokyo, JP;
Junji Yoshida, Tokyo, JP;
Naoki Tsukiji, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
In a semiconductor laser device having a GRIN-SCH-MQW structure, attention is paid to correlation among a lasing wavelength, a refractive index difference between an equivalent refractive index in a region including an active layer and an equivalent refractive index in a region including current blocking layers, and a composition of a barrier layer having a quantum well structure. By finding out an optimum combination of these three parameters, a width of the active layer is made wider than a conventional width, thus preventing occurrence of a kink due to horizontal transverse mode in the active layer.