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相移谱的功率依赖特性对矢量布里渊光时域分析系统的优化设计具有重要意义。对增益型受激布里渊散射(SBS)相移谱进行了建模分析;搭建了外差pump-Stokes系统,在5~90 m W泵浦光功率和5μW~9 m W斯托克斯光功率范围内测量了400 m标准单模光纤的增益型SBS相移谱;分析了Stokes光功率影响增益型SBS相移的机理。结果表明:当固定Stokes光功率时,增益型SBS相移范围与泵浦光功率成良好线性关系;因泵浦耗尽作用的影响,导致当Stokes光功率由5μW上升至8 m W时,增益型SBS相移范围的泵浦光功率灵敏度由1.448(°)/m W下降至1.156(°)/m W。根据理论和实验结果,对增益型VBOTDA系统进行了优化设计分析,为其在长距离和高精度传感领域的发展奠定了基础。
The power dependence of the phase shift spectrum is of great importance for the optimal design of the vector Brillouin optical time-domain analysis system. The phase shift spectrum of gain-stimulated Brillouin scattering (SBS) was modeled and analyzed. A heterodyne pump-Stokes system was set up and the pump power of 5 ~ 90 mW and 5μW ~ 9 mW Stokes The gain-type SBS phase shift spectrum of a 400 m standard single-mode fiber was measured in the optical power range. The mechanism of Stokes optical power affecting the gain-type SBS phase shift was analyzed. The results show that when the Stokes optical power is fixed, the phase shift range of the gain SBS is in a good linear relationship with the pump light power. When the Stokes optical power is increased from 5μW to 8 m W due to the pump depletion, the gain SBS phase shift range pump power sensitivity decreased from 1.448 (°) / m W to 1.156 (°) / mW. According to the theoretical and experimental results, the gain-type VBOTDA system is optimized and analyzed, which lays the foundation for the development of long-distance and high-precision sensing.