Abstract
The Raman amplification can be employed to obtain the enhanced sensing
performance in long-distance Brillouin optical time-domain analyzer (BOTDA)
with higher temperature measurement accuracy over the whole sensing fiber.
Theoretical investigation on the detected probe waveshape has been performed
by using the probe-pump coupled equations combined with Raman amplification.
The experimental characterization has been demonstrated to validate the
theoretical prediction. The results show that, the 75 Km sensing distance
can be achieved by utilizing the bi-directional Raman amplification with
measurement accuracy of ${\pm}0.6^{\circ}$C over the whole sensing fiber. The larger Raman power and
Brillouin pump power are helpful to improve the sensing signal-noise ratio
(SNR). There exists an optimum range for the input probe power and the
extinction ratio (ER) of input Brillouin pump pulse. The BOTDA with Raman
amplification has considerable potentials to realize long- distance strain
and temperature measurement for structural health monitoring and fire
alarming, etc.
© 2010 IEEE
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