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. 06, 1997
Filed:
Oct. 14, 1994
Applicant:
Inventors:
Assignee:
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 12 ; 385125 ; 385 13 ; 65385 ; 25022714 ;
Abstract
An optical fiber intended to be used as a sensor is of the kind suitable for communication and has a longitudinal cavity or hole which can be intentionally closed or has a more narrow shape at definite positions in the longitudinal direction of the fiber. The cavity, the diameter of which can be of the magnitude of order of 5 .mu.m-50 .mu.m, is filled with a material changing its volume depending on physical quantities in the fiber environment. The hole can be closed or made narrower at different positions in the longitudinal direction of the fiber for instance by locally heating the fiber by a pulsed laser beam.