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:
Nov. 12, 2002
Filed:
May. 15, 2000
Stuart John Russell, Bristol, GB;
Andrew Biggerstaff Lewis, Bristol, GB;
John Philip Dakin, Hampshire, GB;
Radio Detection Limited, Bristol, GB;
Abstract
In order to identify a fiber optic cable ( ) a beam ( ) of polarized light is caused to pass down the cable to a first site (A) at which an electromagnetic field ( ) is applied to the cable ( ). The electromagnetic field ( ) traverses the cable ( ) in an essentially transverse direction and has a time-varying component orientated along the length of the cable ( ) at the first site (A), with the component varying so that the line integral thereof along the cable ( ) is non-zero. This results in a variation in the polarization of the light, which can then be detected by a polarization discriminator ( ) at a second site (B), thereby to identify the cable ( ).