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. 08, 2011
Filed:
Nov. 26, 2008
Kazutaka Nara, Tokyo, JP;
Haruki Urabe, Tokyo, JP;
Tsunetoshi Saitoh, Tokyo, JP;
Masahito Morimoto, Tokyo, JP;
Kazutaka Nara, Tokyo, JP;
Haruki Urabe, Tokyo, JP;
Tsunetoshi Saitoh, Tokyo, JP;
Masahito Morimoto, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
Two Mach-Zehnder optical interferometer circuitsandare accurately point-symmetrically connected to each other to form a first point-symmetrically connected optical interferometer circuitconstituting a light input side circuit. Optical signals having a plurality of wavelengths are input to a light input terminal. A second point-symmetrically connected optical interferometer circuithaving the same functional structure as the first point-symmetrically connected optical interferometer circuitis connected to a through port, which is an output terminal of the light input side circuit, as a first light output side circuit. A cross port, which is the other output terminal of the light input side circuit, is connected to a second light output side circuithaving at least one of Mach-Zehnder optical interferometer circuitsandwhose transmittance characteristics are different from those of the Mach-Zehnder optical interferometer circuitsand