Abstract
In this paper we present a Brillouin optical time domain analysis (BOTDA)
sensor that takes advantage of the enhanced characteristics obtained
employing self-heterodyne optical detection combined with synchronous
demodulation. By employing this technique we increase the sensitivity of the
sensor and demonstrate experimentally a 10.75-dB enhancement in the SNR
compared to conventional direct-detection systems. This detection scheme
also enables distributed measurements of the Brillouin phase-shift in an
optical fiber, which can lead to enhanced BOTDA schemes.
© 2011 IEEE
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