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
Sally M. Maughan, Huai H. Kee, and Trevor P. Newson, "57-km single-ended spontaneous Brillouin-based distributed fiber temperature sensor using microwave coherent detection," Opt. Lett. 26, 331-333 (2001)