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:
May. 18, 2004
Filed:
Mar. 04, 2002
Applicant:
Inventor:
Yao-Hao Chang, Chung-Ho, TW;
Assignee:
Hon Hai Precision Ind. Co., Ltd., Taipei Hsien, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/00 ;
U.S. Cl.
CPC ...
G02B 6/00 ;
Abstract
An optical attenuator includes an input optical fiber ( ) and an attenuating device ( ). The attenuating device is a neutral density (ND) filter. The filter has a refractive index matching that of the input optical fiber, to reduce Fresnel reflectance between the attenuating device and a terminal of the input optical fiber. One surface of the ND filter is not perpendicular to an incident light beam, thus preventing multireflectance between the attenuating device and the terminal of the input optical fiber. Therefore, return loss is increased.