Methods of and systems for optical fiber sensing

Details Methods of and systems for optical fiber sensing Methods of and systems for optical fiber sensing

G - Physics

01

J

340/124.4

G01J 9/02 (2006.01) G02B 6/44 (2006.01) H04B 10/12 (2006.01)

Patent

CA 1316235

Abstract An optical fiber sensing system for detecting intrusion of optical fiber or optical fiber cables includes an interferometric arrangement. Two ports of a four port splitter are connected to a source of optical power such as a laser, for example, and to a detector. The other two ports are connected to ends of a length of monitoring optical fiber. An input signal to the splitter is split with one subsignal being directed in one direction around the length of optical fiber which serves as a common path between the two ports. The other signal is caused to travel around the common path in an opposite direction. The split signals are recombined in the splitter and their phase difference measured as a detectable pattern by the detector. Should there be intrusion of the optical fiber or a cable containing the monitoring optical fiber, the pattern which is detected will change a significant amount.

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