Abstract
An iterative subdivision method is proposed to improve the spatial resolution of Brillouin optical
time-domain reflectometry. By considering the affection of the response time of detection system to the detected
Brillouin signal together with the probe pulse, an energy density distribution (EDD) is obtained and the fiber which
generates the detected Brillouin signal is divided into short segments with equal length. Then the sub Brillouin
signal generated from each segment is extracted out of the detected Brillouin signal based on the EDD. By iteratively
using the subdivision method along the fiber, a group of Brillouin signals corresponding to short fiber segments can
be obtained. So the Brillouin frequency shift of shorter fiber can be obtained and a higher spatial resolution is
achieved. To improve the accuracy, a cross correlation algorithm is also used to enhance the signal-to-noise ratio of
the Brillouin signal before the subdivision procedure. A spatial resolution of 1.5 m in a 50 km sensing
fiber is obtained by using 100 ns probe pulse, and a spatial resolution of 0.1 m in a 1 km sensing
fiber is also obtained by using 10 ns probe pulse.
© 2013 IEEE
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