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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5μW~15mW和斯托克斯光功率3.5~110mW范围内测量了400m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。
Modeling and simulation of a wide range of power-dependent characteristics of the phase shift spectrum of stimulated Brillouin scattering loss; design of stimulated Brillouin loss phase shift spectroscopy measurement system based on heterodyne pumping - Stokes technology, pumping system Stimulated Brillouin loss phase shift spectrum of 400m standard single-mode optical fiber was measured in the range of optical power 5μW ~ 15mW and Stokes optical power 3.5 ~ 110mW. The measured excitation Brillouin loss phase shift spectrum generated center Asymmetry mechanism. The results show that the range of phase shift of stimulated Brillouin loss shows a good linear relationship with the Stokes optical power and is basically unaffected by the pump light power. The center asymmetry of the measured phase shift spectrum of the stimulated Brillouin loss is mainly determined by optical fiber Chromatic dispersion and non-linear refractive index caused by the nonlinear effect of interaction. According to the theoretical and experimental results, the power dependence of stimulated Brillouin scattering phase shift spectrum is analyzed in microwave photonic signal processing and distributed optical fiber sensing, and the application of system design based on stimulated Brillouin scattering phase shift principle Provide a theoretical basis.