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

1988-08-31

1990-02-27

Gonzalez, Frank

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250227, G02B 600

Patent

active

049040502

ABSTRACT:
An optical fiber sensing system for detecting intrusion of optical fiber or optical fiber cables includes an interferometric arrangement. Two ports (28, 30) of a four port splitter (25) are connected to a source (26) of optical power such as a laser, for example, and to a detector (32). The other two ports (46, 48) are connected to ends of a length (50) 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.

REFERENCES:
patent: 4399430 (1983-08-01), Kitchen
patent: 4775214 (1988-10-01), Johnson
patent: 4775216 (1988-10-01), Layton
Article entitled "Integrated Communication and Sensing System Using One Single Mode Optical Fiber", vol. 24, No. 13 of Electronic Letters, 6/23/88.
Article entitled "Use of Fiber for Security", Jun. 1988 issue of Lightwave Magazine.

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