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:
Feb. 23, 2010
Filed:
Apr. 13, 2006
Edmund S. R. Sikora, Ipswich, GB;
Peter Healey, Ipswich, GB;
Edmund S. R. Sikora, Ipswich, GB;
Peter Healey, Ipswich, GB;
British Telecommunications public limited company, London, GB;
Abstract
An optical sensing method transmits radiation from a source onto an optical link, the radiation being passed through an unbalanced interferometer connected between the source and the link. The radiation which is reflected back and has travelled through a portion of the link which is subject to an external disturbance is received and passed through the same unbalanced interferometer. A detector is used to detect the radiation that has returned through the unbalanced interferometer. To improve sensitivity, the unbalanced interferometer includes a coupler for coupling radiation to the detector, the coupler being an N ×N coupler where N is an integer greater or equal to 3.