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:
Jun. 15, 2004
Filed:
Dec. 24, 2001
Tai-Cheng Yu, Tu-Cheng, TW;
Yao-Hao Chang, Tu-Chen, TW;
Hon Hai Precision Ind. Co., Ltd., Taipei Hsien, TW;
Abstract
An optical attenuator ( ) includes: an optical splitter ( ), a collimator ( ), two detectors ( ), a first and second reflectors ( ), an attenuating element ( ) and a driving device ( ). The optical splitter includes a ferrule ( ) and a GRIN (graded index) lens ( ). The collimator is similar to the optical splitter. Input optical signals are transmitted from an input fiber ( ) through the optical splitter and are then directed to the first reflector. The optical signals reflected by the first reflector pass through the attenuating element and are subsequently reflected to the collimator by the second reflector. The two detectors receive sampling signals via an input and an output sampling fibers ( ). The driving device can drive the attenuating element in response to the attenuation ratio coming from the two detectors.