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  4. Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers
 
research article

Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers

Soto, Marcelo A.
•
Ricchiuti, Amelia Lavinia
•
Zhang, Liang
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2014
Optics Express

A technique to enhance the response and performance of Brillouin distributed fiber sensors is proposed and experimentally validated. The method consists in creating a multi-frequency pump pulse interacting with a matching multi-frequency continuous-wave probe. To avoid nonlinear cross-interaction between spectral lines, the method requires that the distinct pump pulse components and temporal traces reaching the photo-detector are subject to wavelength-selective delaying. This way the total pump and probe powers launched into the fiber can be incrementally boosted beyond the thresholds imposed by nonlinear effects. As a consequence of the multiplied pump-probe Brillouin interactions occurring along the fiber, the sensor response can be enhanced in exact proportion to the number of spectral components. The method is experimentally validated in a 50 km-long distributed optical fiber sensor augmented to 3 pump-probe spectral pairs, demonstrating a signal-to-noise ratio enhancement of 4.8 dB.

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oe-22-23-28584.pdf

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http://purl.org/coar/version/c_970fb48d4fbd8a85

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