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:
Oct. 12, 2004
Filed:
May. 30, 2002
Isao Ooyama, Tokyo, JP;
Hiroyuki Koshi, Tokyo, JP;
Takuya Komatsu, Tokyo, JP;
Kazuhisa Kashihara, Tokyo, JP;
The Furukawa Electric Co., LTD, Tokyo, JP;
Abstract
An optical multiplexer/demultiplexer has a plurality of Mach-Zehnder optical interferometer multiplexing/demultiplexing circuits connected in plural stages, at least one of the plurality of Mach-Zehnder optical interferometer multiplexing/demultiplexing circuits including a first optical waveguide, a second optical waveguide disposed along the first optical waveguide, a first directional coupling portion that connects a first part of the first optical waveguide to a first part of the second optical waveguide, and a second directional coupling portion that connects a second part of the first optical waveguide to a second part of the second optical waveguide. A relationship among a coupling portion length L of at least one of the first and second directional coupling portions, a complete coupling length L of at least one of the first and second directional coupling portions and a lead portion coupling length L of at least one of the first and second directional coupling portions, is substantially: