Abstract

We present a novel technique for performing single-ended distributed fiber temperature measurements by use of microwave heterodyne detection of spontaneous Brillouin scattering. Brillouin frequency-shift measurements were obtained for a sensing length of 57  km, with a spatial resolution of 20  m. The rms error in frequency measurements at the far end of the sensing fiber was less than 3  MHz, and the overall frequency dependence on temperature was 1.07±0.06 MHz/K.

© 2001 Optical Society of America

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