25 km Brillouin based single-ended distributed fibre sensor for threshold detection of temperature or strain

We report on a novel arrangement for a single-ended distributed fibre sensor based on stimulated Brillouin scattering, sensitive enough to quickly detect an unsafe level of temperature or strain applied on any 2 m section of a 25 km sensing fibre. The study also reveals the influence of self phase modulation, a major limiting factor for the probe pulse power.

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