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:
Jan. 27, 2009
Filed:
Apr. 26, 2007
Noriaki Kaida, Yokohama, JP;
Noriaki Kaida, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
The present application provides a laser diode that enables to reduce the differential resistance. The laser diode of the invention provides first and second guiding layer in an n-side of an active layer. The first guiding layer is put between the active layer and the n-type cladding layer; while, the second guiding layer is put between the first cladding layer and the active layer. These first and second guiding layers are intrinsic layers or p-type layers, where the conduction band level of the second guiding layer is lower than that of the first guiding layer, while the band gap wavelength of the first guiding layer is shorter than that of the second guiding layer.