Abstract
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.
© 2010 IEEE
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