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. 10, 2007
Filed:
Aug. 10, 2004
Xiaoqing Jiang, Hangzhou, CN;
Yuying Wu, Matsudo, JP;
Minghua Wang, Hangzhou, CN;
Guanming Lai, Hangzhou, CN;
Xiaoqing Jiang, Hangzhou, CN;
Yuying Wu, Matsudo, JP;
Minghua Wang, Hangzhou, CN;
Guanming Lai, Hangzhou, CN;
Seikoh Giken Co., Ltd., , JP;
Abstract
A thermo optical type variable optical attenuator suitable for application in an array type variable optical attenuator that realizes low crosstalk between neighboring waveguides in the array is provided. A thermo optical type variable optical attenuatorusing optical material having negative optical effect provides a multimode optical propagating partdisposed via a tapered partand a tapered partbetween single mode optical waveguidesand. A thin-film heateris disposed above the multimode optical propagating partat an angle of inclination β in relation to the direction of light propagation along a first optical waveguide. Moreover, a second optical waveguideoptically coupled with a side faceSof the multimode optical propagating partis provided at an angle of inclinationβ in relation to the direction of light propagation along the first optical waveguide