== Abstract ==

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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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== Original document ==

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The different versions of the original document can be found in:

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* [http://dx.doi.org/10.1109/JPHOT.2012.2219301 http://dx.doi.org/10.1109/JPHOT.2012.2219301]

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* [https://doi.org/10.1109/jphot.2012.2219301 https://doi.org/10.1109/jphot.2012.2219301] under the license implied-oa

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* [http://xplorestaging.ieee.org/ielx5/4563994/6244834/06304899.pdf?arnumber=6304899 http://xplorestaging.ieee.org/ielx5/4563994/6244834/06304899.pdf?arnumber=6304899],

: [http://dx.doi.org/10.1109/jphot.2012.2219301 http://dx.doi.org/10.1109/jphot.2012.2219301]

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* [https://ui.adsabs.harvard.edu/abs/2012IPhoJ...4.1900M/abstract https://ui.adsabs.harvard.edu/abs/2012IPhoJ...4.1900M/abstract],

: [http://ieeexplore.ieee.org/document/6304899 http://ieeexplore.ieee.org/document/6304899],

: [https://academic.microsoft.com/#/detail/1989113147 https://academic.microsoft.com/#/detail/1989113147]

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