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根据耦合模理论和琼斯矩阵与斯托克斯矢量的关系给出单模均匀光纤布拉格光栅(FBG)反射和透射斯托克斯参量公式,数值模拟出低双折射单模光纤均匀FBG在不同双折射值下反射和透射斯托克斯参量随波长变化的曲线。结果显示4个归一化斯托克斯参量中,s1关于中心波长λ0呈反对称分布,S0,s2和s3关于λ0呈对称分布;双折射值增大谱线不产生漂移,但谱线反射带宽变窄,反射信号与透射信号斯托克斯参量振幅均有不同程度的变化,表明双折射值对斯托克斯参量的影响非常显著。测出单模光纤均匀FBG反射和透射斯托克斯参量随波长变化曲线,理论分析与实验结果基本符合。
According to the coupling-mode theory and the relationship between Jones matrix and Stokes vector, the parameters of the reflected and transmitted Stokes parameters of a single-mode uniform fiber Bragg grating (FBG) are given. The results show that the uniform Bragg grating Reflection and transmission Stokes parameters at varying refraction values versus wavelength. The results show that the four normalized Stokes parameters, s1 center wavelength λ0 was anti-symmetrical distribution, S0, s2 and s3 symmetrical distribution about λ0; birefringence increases the spectrum does not produce drift, but spectral reflection The bandwidth is narrow, the amplitude of the reflected signal and the transmitted signal Stokes parameters have varying degrees of change, indicating that the birefringence value of the Stokes parameter is very significant. The FBG reflection and transmission Stokes parameters of single-mode fiber were measured with wavelength, the theoretical analysis and the experimental results are basically in line.