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:
Nov. 18, 2008
Filed:
Aug. 30, 2004
Kazuhiro Shiba, Tokyo, JP;
Koichi Naniwae, Tokyo, JP;
Shinya Sudo, Tokyo, JP;
Koji Kudo, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Input ports () formed from fundamental mode waveguides are provided at one end of a multimode waveguide (). Further, an output port () formed from a fundamental mode waveguide is provided at the other end of the multimode waveguide (). The multimode waveguide () has a width wider than those of the input ports () and the output port (), and provides modes including multimode to the waveguide. The multimode waveguide () is embedded with a buried layer (). Both of the end faces of the multimode waveguide () are made to be planes equivalent to a (100) plane or planes inclined from these planes. In a case of inclined planes, the planes are made to be planes inclined to a direction that the waveguide region spreads toward a stacked direction of the semiconductor layers.