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:
Aug. 25, 2009
Filed:
Mar. 22, 2007
Yuichi Uchida, Hirakata, JP;
Nobuyuki Miyagawa, Takatsuki, JP;
Tadahiro Yamaji, Hirakata, JP;
Takuya Matsumoto, Osaka, JP;
Yuichi Uchida, Hirakata, JP;
Nobuyuki Miyagawa, Takatsuki, JP;
Tadahiro Yamaji, Hirakata, JP;
Takuya Matsumoto, Osaka, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
In an optical attenuator, there are a first optical waveguideA connected to an input optical waveguide, a second optical waveguideB connected to an output optical waveguideand a connecting optical waveguide, which are connected with each other in series. A first recessA and a second recessB are formed in a positional relationship of opposite directions with respect to an axial direction of an optic axis of light that is inputted through the input optical waveguide, transmitted through the first optical waveguideA, the connecting optical waveguideand the second optical waveguideB and outputted from the output optical waveguide. Further, a first optical attenuating heaterA and a second optical attenuating heaterB are arranged so as to produce opposite refractive index distributions in the axial direction of the optic axis of the light that is inputted through the input optical waveguide, transmitted through the first optical waveguideA, the connecting optical waveguideand the second optical waveguideB and outputted from the output optical waveguide, in the first optical waveguideA and the second optical waveguideB. The optical attenuator capable of reducing a polarization dependent loss for a desired optical attenuation is provided without utilizing an interference of lights.