建模并仿真了受激布里渊散射损耗相移谱的宽范围功率依赖特性；设计了基于外差抽运-斯托克斯技术的受激布里渊损耗相移谱测量系统，在抽运光功率5 μW~15 mW和斯托克斯光功率3.5~110 mW范围内测量了400 m标准单模光纤的受激布里渊损耗相移谱；分析了实测受激布里渊损耗相移谱产生中心不对称性的机理。结果表明，受激布里渊损耗相移范围与斯托克斯光功率呈良好线性关系，基本不受抽运光功率影响；实测受激布里渊损耗相移谱中心不对称性主要由光纤色散以及非线性折射率引起的非线性效应共同作用产生。根据理论和实验结果，分析了受激布里渊散射相移谱功率依赖性在微波光子信号处理和分布式光纤传感中的应用，为基于受激布里渊散射相移原理的应用系统设计提供理论依据。

The wide range for power dependence of phase shift spectrum of stimulated Brillouin scattering (SBS) is characterized through mathematical modeling and simulation; a phase shift measurement system of SBS loss based on heterodyne pump-Stokes technique is designed. The phase shift spectrum of 400 m standard single-mode fiber in SBS loss is measured in a pump wave power range of 5 μW~15 mW and a Stokes wave power range of 3.5~110 mW. The mechanism of measured center-asymmetric phase shift spectrum in SBS loss is analyzed. The results indicate that phase shift range of SBS loss has a good linear relationship with Stokes wave power and is almost independent of pump wave power. The measured center-asymmetric phase shift spectrum of SBS loss is mainly caused by fiber dispersion and nonlinear effect induced by nonlinear refractive index. According to the theoretical and experimental results, the applications of power dependence of SBS phase shift spectrum in microwave photonic signal processing and distributed optic-fiber sensing are analyzed, which provides theoretical basis for the design of application systems based on SBS phase shift.