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. 23, 2016
Filed:
Dec. 12, 2011
Tadashi Okumura, Tokyo, JP;
Shinichi Saito, Tokyo, JP;
Kazuki Tani, Tokyo, JP;
Etsuko Nomoto, Tokyo, JP;
Katsuya Oda, Tokyo, JP;
Tadashi Okumura, Tokyo, JP;
Shinichi Saito, Tokyo, JP;
Kazuki Tani, Tokyo, JP;
Etsuko Nomoto, Tokyo, JP;
Katsuya Oda, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to provide a highly reliable silicon-germanium semiconductor optical element of high luminous efficiency or of low power consumption that can reduce or prevent the occurrence of dislocations or crystal defects on the interface between a light emitting layer or a light absorption layer and a cladding layer, in a silicon-germanium semiconductor optical element, a germanium protective layerof non-light emission is disposed between a germanium light emitting layer or the light absorption layerand a cladding layerdisposed above a substrate. The germanium protective layerhas the electrical conductivity different from electrical conductivity of the germanium light emitting layer or the light absorption layer