Fang Jian, Xu Pengbai, Dong Yongkang, Shieh William
Opt Express. 2017 Jun 26;25(13):15188-15198. doi: 10.1364/OE.25.015188.
We demonstrate a novel single-shot distributed Brillouin optical time domain analyzer (SS-BOTDA). In our method, dual-polarization probe with orthogonal frequency-division multiplexing (OFDM) modulation is used to acquire the distributed Brillouin gain spectra, and coherent detection is used to enhance the signal-to-noise ratio (SNR) drastically. Distributed temperature sensing is demonstrated over a 1.08 km standard single-mode fiber (SSMF) with 20.48 m spatial resolution and 0.59 °C temperature accuracy. Neither frequency scanning, nor polarization scrambling, nor averaging is required in our scheme. All the data are obtained through only one-shot measurement, indicating that the sensing speed is only limited by the length of fiber.
我们展示了一种新型的单次分布式布里渊光时域分析仪（SS-BOTDA）。在我们的方法中，采用具有正交频分复用（OFDM）调制的双偏振探头来获取分布式布里渊增益谱，并使用相干检测来大幅提高信噪比（SNR）。在一根1.08公里长的标准单模光纤（SSMF）上进行了分布式温度传感演示，空间分辨率为20.48米，温度精度为0.59℃。我们的方案既不需要频率扫描，也不需要偏振扰频，也不需要平均。所有数据仅通过一次测量即可获得，这表明传感速度仅受光纤长度限制。
