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基于受激布里渊散射Langevin噪声模型,通过近似的三波耦合方程组,采用了时域有限差分法,对光纤中受激布里渊散射过程进行数值模拟计算。对长度为10 km,折射率为1.5132的单模光纤,分析了50μs内光纤中的光场和声波场的时间和空间变化特性和散射光的功率变化特性。数值模拟中,在一定的抽运入射光作用下,把Stokes光作为起振光入射到光纤的另外一端,发现起振光的存在与否会影响到抽运光场、散射光场和声波场的时间空间振幅变化,并且得出存在Stokes光时散射光的功率随时间趋于饱和以及没有Stokes光时散射光功率随时间的近似线性变化。
Based on stimulated Brillouin scattering Langevin noise model, the finite difference time-domain method was used to simulate the Stimulated Brillouin scattering process in optical fiber by using approximate three-wave coupling equations. For the single-mode fiber with the length of 10 km and the refractive index of 1.5132, the temporal and spatial variations of the optical and acoustic fields and the power variations of the scattered light in the 50 μs fiber are analyzed. In the numerical simulation, Stokes light is incident on the other side of the fiber under the action of a certain pumping incident light, and it is found that the presence or absence of the pumping light will affect the pump light field, the scattering light field and the sonic field The results show that the power of the scattered light tends to be saturated with time in the presence of Stokes light and the approximate linear change of the power of the scattered light with time in the absence of Stokes light.