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A direct-detection Brillouin optical time-domain reflectometry (BOTDR) isproposed and demonstrated by using an up-conversion single-photon detector anda fiber Fabry-Perot scanning interferometer (FFP-SI). Taking advantage of highsignal-to-noise ratio of the detector and high spectrum resolution of theFFP-SI, the Brillouin spectrum along a polarization maintaining fiber (PMF) isrecorded on a multiscaler with a small data size directly. In contrast withconventional BOTDR adopting coherent detection, photon-counting BOTDR issimpler in structure and easier in data processing. In the demonstrationexperiment, characteristic parameters of the Brillouin spectrum including itspower, spectral width and frequency center are analyzed simultaneously along a10 km PMF at different temperature and stain conditions.

Photon-counting Brillouin optical time-domain reflectometry based on up-conversion detector and fiber Fabry-Perot scanning interferometer