Gao Xia, Yang Zhisheng, Wang Sheng, Hong Xiaobin, Sun Xizi, Soto Marcelo A, Wu Jian, Thévenaz Luc
Opt Express. 2021 Jul 5;29(14):22146-22158. doi: 10.1364/OE.426655.
Noise models for both single-pulse and coded Brillouin optical time-domain analyzers (BOTDA) are established to quantify the actual signal-to-noise ratio (SNR) enhancement provided by pulse coding at any fiber position and in any operating condition. Simulation and experimental results show that the polarization noise and spontaneous Brillouin scattering (SpBS) to signal beating noise could highly penalize the performance of coded-BOTDA, depending on the code type and the interrogated fiber position. The models also serve as a useful tool to optimize the SNR improvement by trading off the accumulated Brillouin gain and optical noises.
建立了单脉冲和编码布里渊光时域分析仪（BOTDA）的噪声模型，以量化在任何光纤位置和任何工作条件下脉冲编码所提供的实际信噪比（SNR）增强。仿真和实验结果表明，偏振噪声和自发布里渊散射（SpBS）与信号拍频噪声会严重影响编码BOTDA的性能，这取决于编码类型和被探测光纤位置。这些模型还可作为一个有用的工具，通过权衡累积的布里渊增益和光学噪声来优化SNR的提高。
