Abstract

We demonstrate a novel, Raman amplifier-based long-distance sensing system for simultaneous measurement of temperature and strain using a combined sensing probe of an erbium-doped fiber (EDF) and a fiber Bragg grating. By recycling residual Raman pump power for generation of amplified spontaneous emission in the EDF after distributed Raman amplification in the transmission fiber, the overall system configuration was significantly simplified without requiring any additional broadband light source. We obtain a remote sensing operation of simultaneous temperature and strain measurement at a location of 50 km. High quality of sensing signals with a ~11 dB signal-to-noise ratio (SNR) is readily achieved even after the 50 km transmission with distributed Raman amplification.

© 2004 Optical Society of America

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References

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App. Opt.

L. Bjerkan, �??Application of fiber-optic Bragg grating sensors in monitoring environmental loads of overhead power transmission lines,�?? App. Opt. 39, 554-560 (2000).
[CrossRef]

Appl. Opt.

Conference on Optical Fiber Sensors

Y. Nakajima, Y. Shindo, and T. Yoshikawa, �??Novel concept as long-distance transmission FBG sensor system using distributed Raman amplification,�?? in Proc. 16th International Conference on Optical Fiber Sensors (Nara Japan, October 2003), Th1-4.

IEEE Photon. Technol. Lett.

P.-C. Peng, H.-Y Tseng, and Sien Chi, �??Long-distance FBG sensor system using a linear-cavity fiber Raman laser scheme,�?? IEEE Photon. Technol. Lett. 16, 575-577 (2004).
[CrossRef]

J. Lightwave Technol.

A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, C. G. Askins, M. A. Putnam, and E. J. Friebele, �??Fiber grating sensors,�?? J. Lightwave Technol. 15, 1442-1463 (1997).
[CrossRef]

Opt. Express

Opt. Lett.

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Figures (5)

Fig. 1.
Fig. 1.

Experimental setup for our Raman amplifier-based long-distance remote sensor system using a sensing probe of an EDF and a FBG.

Fig. 2.
Fig. 2.

(a) Measured Raman gain profile for the 50 km single mode fiber used in this experiment with the two Raman pumps. (b) Measured optical spectrum of the generated ASE in the EDF with the residual pump power after passing through the FBG.

Fig. 3.
Fig. 3.

Optical spectrum of the output sensing signal after the 50-km transmission when the temperature was increased

Fig. 4.
Fig. 4.

(a) Laser center wavelength and (b) output peak power as a function of applied temperature.

Fig. 5.
Fig. 5.

(a) Optical spectrum of the output sensing signal after the 50-km transmission when the applied tensile strain was increased. (b) Sensing signal center wavelength as a function of applied tensile strain.

Equations (1)

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( Δ T Δ ε ) = ( 8.19 pm ° C 1.1 pm μ ε 0.04 dB ° C 0 ) 1 ( Δ λ Δ P ) = K 1 ( Δ λ Δ P )

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