Kadum Jaffar Emad, Feng Cheng, Schneider Thomas
THz Photonics Group, Institut für Hochfrequenztechnik, Technische Universität Braunschweig Schleinitzstr. 22, 38106 Braunschweig, Germany.
Sensors (Basel). 2020 Aug 2;20(15):4311. doi: 10.3390/s20154311.
The excess noise due to stimulated Brillouin scattering (SBS) in gain and loss-based Brillouin optical time-domain analyzers (BOTDA) has been investigated theoretically and experimentally for the first time to the best of our knowledge. This investigation provides a full insight to the SBS-induced noise distribution, which mainly comes from phase-to-intensity conversion noise and the beating noise between the probe wave and spontaneous Brillouin scattering. A complete theoretical model, which is in good agreement with the experimental results, is presented to describe the noise. The results show that a loss-based BOTDA setup gives a better noise performance than a gain-based one in both time and frequency domain. The SBS-induced noise has been characterized in dependence on the pump and probe power and the spatial resolution.
据我们所知，首次从理论和实验两方面对基于增益和损耗的布里渊光时域分析仪（BOTDA）中受激布里渊散射（SBS）产生的过量噪声进行了研究。该研究全面深入地了解了SBS引起的噪声分布，这种噪声主要源于相位到强度的转换噪声以及探测波与自发布里渊散射之间的拍频噪声。提出了一个与实验结果吻合良好的完整理论模型来描述该噪声。结果表明，基于损耗的BOTDA装置在时域和频域方面都比基于增益的装置具有更好的噪声性能。已对SBS引起的噪声依泵浦功率、探测功率和空间分辨率进行了表征。
