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Time-Domain Distributed Fiber Sensor With 1 cm Spatial Resolution Based on Brillouin Dynamic Grating

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4 Author(s)
Kwang Yong Song ; Inst. of Electr. Eng., Ecole Polytech. Fed. de Laussane, Lausanne, Switzerland ; Sanghoon Chin ; Primerov, N. ; Thevenaz, L.

We demonstrate an optical time-domain distributed fiber sensor showing the highest spatial resolution ever reported based on Brillouin dynamic grating in a polarization-maintaining fiber. In our scheme, the acoustic gratings containing the information on the local Brillouin frequency are generated by a long pump pulse in one polarization, and read out by a short probe pulse in the orthogonal polarization at a clearly distinct optical frequency from the pump. In the experiment, distributed temperature measurements over a 20 m fiber are performed with 1.2 cm spatial resolution.

Published in:

Lightwave Technology, Journal of  (Volume:28 ,  Issue: 14 )

Date of Publication:

July15, 2010

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