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光纤 Bragg光栅的饱和效应可引起二阶衍射 ,并使一阶衍射的峰值反射率下降 .本文利用折射率变化模型和耦合模理论 ,模拟了饱和情况下 Bragg光栅的一阶和二阶衍射谱 ,并讨论了饱和系数对一阶和二阶衍射的 Bragg波长和峰值反射率的影响 .数值模拟结果与参考文献中的实验结果相吻合 .
The saturation effect of fiber Bragg grating can cause second-order diffraction and decrease the peak reflectivity of the first-order diffraction.In this paper, the first-order and second-order diffraction spectra of Bragg gratings under saturation are simulated by using the refractive index variation model and coupled-mode theory, The influence of the saturation coefficient on the Bragg wavelength and the peak reflectivity of the first and second order diffraction is also discussed. The numerical simulation results are in good agreement with the experimental results in references.