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:
Mar. 08, 2005
Filed:
Feb. 01, 2002
Takayuki Matsuyama, Hiratsuka, JP;
Masaki Tohyama, Yokohama, JP;
Takayuki Matsuyama, Hiratsuka, JP;
Masaki Tohyama, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
The ridge waveguide type photo semiconductor device includes: a first cladding layer of a first conductivity type formed on a semiconductor substrate of the first conductivity type; an active layer formed on the first cladding layer; a second cladding layer of a second conductivity type formed on the active layer; a third cladding layer of the second conductivity type formed on the second cladding layer and being worked so as to have a ridge shape; and an impurity diffusion region formed in the second cladding layer and the active layer on both sides of the ridge-shaped third cladding layer and which has a higher resistance value than that of the second cladding layer below the ridge shape.