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A calibrated 27-km distributed fiber temperature sensor based on microwave heterodyne detection of spontaneous Brillouin backscattered power

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3 Author(s)
Maughan, S.M. ; Optoelectron. Res. Centre, Southampton Univ., UK ; Kee, H.H. ; Newson, T.P.

Single-ended distributed fiber temperature measurements using the novel technique of microwave (11 GHz) coherent detection of spontaneous Brillouin backscattered power are presented. Anti-Stokes power traces mere obtained for a sensing length of 27.4 km, believed to be the longest yet demonstrated for such spontaneous power measurements. The power dependence on temperature was measured as 0.36/spl plusmn/0.04%/K, and the rms temperature error was less than 3.5 K at the far end of the sensing fiber.

Published in:

Photonics Technology Letters, IEEE  (Volume:13 ,  Issue: 5 )