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:
Apr. 12, 2011
Filed:
Sep. 19, 2008
Tsuyoshi Yamamoto, Kawasaki, JP;
Manabu Matsuda, Kawasaki, JP;
Mitsuru Ekawa, Kawasaki, JP;
Kan Takada, Kawasaki, JP;
Shigekazu Okumura, Kawasaki, JP;
Tsuyoshi Yamamoto, Kawasaki, JP;
Manabu Matsuda, Kawasaki, JP;
Mitsuru Ekawa, Kawasaki, JP;
Kan Takada, Kawasaki, JP;
Shigekazu Okumura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical semiconductor device includes an active layer, a first semiconductor layer formed above the active layer and made from a semiconductor material containing Al, a second semiconductor layer formed above the first semiconductor layer and made from a semiconductor material which does not contain any one of Al and P and whose band gap is greater than that of the active layer, and a third semiconductor layer formed above the second semiconductor layer and made from a semiconductor material which does not contain Al but contains P. The second semiconductor layer is formed such that the first semiconductor layer and the third semiconductor layer do not contact with each other.