Optical fiber Sagnac interferometer which identifies harmonicall

Details Optical fiber Sagnac interferometer which identifies harmonicall Optical fiber Sagnac interferometer which identifies harmonicall

1999-01-29

2000-04-11

Turner, Samuel A.

Static information storage and retrieval

Magnetic bubbles

Guide structure

25022719, 385 12, G01B 902

Patent

active

060495065

ABSTRACT:
An optical fiber sensing system (20) applies spectral analysis to time-varying disturbances in the output optical power from a Sagnac interferometer. In particular, harmonically related null frequencies in the spectrum (402) of the output optical power from the Sagnac interferometer are used to uniquely determine the location of a disturbance along a fiber cable (50). An optical signal having relatively high coherence is fed into a splitter (25), which creates a pair of subsignals that are sent in opposite directions around a common optical path. The splitter is effective to recombine the subsignals after they have traveled around the common path. The location of the disturbance is determined by the formula: ##EQU1## z is the distance between the locations of the disturbance and the splitter;

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J. P. Dakin, et al., "A Novel Distributed Optical Fibre Sensing System Enabling Location Of Disturbances In A Sagnac Loop Interferometer," SPIE Vol, 838 Fiber Optic and Laser Sensors V, 1987, pp. 325-328.
E. Udd, ed., "Light Sources," Fiber Optic Sensors, 46-47, .sctn. 3.3, 1991.
K. Y. Chen, et al., "Integrated Communication And Sensing System Using One Single-Mode Optical Fibre," Electronics Letters, vol. 24, No. 13, 790-793, Jun. 1988.

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