Scientific Papers


High-Spatial- and Spectral-Resolution Time-Domain Brillouin Distributed Sensing by Use of Two Frequency-Shifted Optical Beam Pairs

Authors (PARTNER)

A. Minardo, L. Zeni, R. Bernini (SUN)

Name and/or number of magazine/newspaper/journal…

IEEE Photonics Journal, vol.4, no. 5, pp. 1900–1908, October 2012.

DOI: 10.1109/JPHOT.2012.2219301


We present a novel scheme aimed to improve spectral resolution in Brillouin distributed sensors based on single-mode standard fibers. The method makes use of two frequency-shifted optical pairs, the first one (the "writing" pair) devoted to excite the acoustic wave and the second one (the "reading" pair) employed to perform Brillouin gain interrogation. A numerical analysis demonstrates the capability of the method to ensure high spectral resolution even when operating in the high-spatial-resolution (~1 m or less) regime. Preliminary experimental results carried out at 1-m spatial resolution are also reported.


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