Abstract
We propose a single-end-access correlation-domain distributed fiber-optic
sensor based on stimulated Brillouin scattering (SBS) in a
polarization-maintaining optical fiber (PMF). Frequency-modulated pump and
probe waves are launched into the same end of the PMF with orthogonal
polarization states. Assisted by a polarization beam splitter and a
polarization-maintaining isolator installed at the other end of the PMF, SBS
interaction between the reflected probe wave and the forward pump wave is
exclusively localized within the PMF. Unlike the previously-reported method
based on placing a reflector at the far end of the fiber (Song ,
2008), in which the measurement range is shortened to a half of the nominal
value determined by the frequency modulation, as given in the work by Hotate
and Hasegawa (2000), our new method maintains the range as the nominal
value. Distributed sensing of temperature or strain is experimentally
demonstrated with the measurement range/the spatial resolution of 200 m/16
cm, 56 m/5 cm, or 5.6 m/5 mm, respectively.
© 2010 IEEE
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