科研之友
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摘要
We propose a distributed Brillouin temperature fiber sensor using a single-photon detector. In our scheme, the Rayleigh/anti-stokes ratio is used to measure the temperature information along the sensing fiber. A cascading fiber Bragg grating filter is employed to separate Brillouin anti-stokes signals from the backscattering Rayleigh light with a similar to 23 dB high rejection ratio. Benefiting from the high sensitivity of the single-photon detector, the system exhibits a dynamic range of 18 dB (corresponding to 90-km sensing length) with a measured temperature error of 1 degrees C without any optical amplification. Furthermore, the sensor shows a 1.2 m spatial resolution and 1.7 degrees C temperature error with an 8.5 dB dynamic range, which means the sensing length can be extended to 42.5 km. This scheme can simultaneously achieve a large dynamic range and a high spatial resolution.
