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:
Dec. 16, 2003
Filed:
Nov. 26, 2001
Yao-Hao Chang, Tu-Chen, TW;
Kun-Tsan Wu, Tu-Chen, TW;
Hon Hai Precision Ind. Co., LTD,, Taipei Hsien, TW;
Abstract
A variable optical attenuator ( ) of the present invention includes a cover ( ), a housing ( ), an optical module ( ), a reciprocating means ( ), and a filter ( ). The reciprocating means, optical module, and filter are assembled in the housing. The reciprocating means includes a carrier ( ) mounted to a rotatable screw rod ( ). The filter has a varying optical density gradient over one of its dimensions and mounts on the carrier. Light signals are transmitted from an input optical fiber ( ) through the filter and are reflected off a reflector ( ) of the optical module to pass again through the filter to an output optical fiber ( ). When the screw rod is rotated, the carrier with the filter mounted on it moves toward one side of the housing or another, varying the attenuation of the light signals. The screw rod can be rotated using a screwdriver through a side hole ( ) on either side of the housing.