Abstract
The characteristics of interference fading in a phase sensitive optical
time domain reflectometer (
$\phi
$
-OTDR) system with a three optical frequency source are described
in this paper. It is observed in the experiments that the fading appearance
is quite stable over 400 different pulse scans for each of frequencies, but
different for the three frequencies. A model is proposed to explain the experimental
phenomena, in which the fading waveform is expressed by an integral of propagation
phase factor, taking non-uniform index distributions along the sensing fiber
into account, multiplied by the random Rayleigh scattering coefficient summed
within the detector response period. Simulations show that the basic characteristics
of experimental observations can be explained by the model.
© 2013 IEEE
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