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由于写入方式的限制,长周期光纤光栅(LPG)的实际折射率分布与经典理论有明显的差异,由此造成写入光栅的特性与经典理论的导出结果不能完全吻合。用傅里叶级数展开的方法对LPG逐点写入造成的高斯型折射率分布进行谐波分析,据此总结了高斯型折射率分布下光束形状与光栅周期的关系对谐波分布的影响,讨论了逐点写入的最佳参数选择,得出了对光栅写入和特性估计有关的结论,并给出了高斯光束逐点写入和振幅掩模板写入长周期光栅的透射谱比较。
Due to the limitations of the writing method, the actual refractive index distribution of long period fiber grating (LPG) is obviously different from the classical theory, which leads to the fact that the characteristics of the writing grating can not exactly match with the derivation results of the classical theory. The Fourier series expansion method is used to analyze the Gaussian refractive index distribution caused by LPG writing point by point. Based on this, the influence of the relationship between the beam shape and the grating period on the harmonic distribution under Gaussian refractive index distribution is summarized , Discusses the best parameter selection point by point writing and draws conclusions about the raster writing and characterization, and gives the comparison of the transmission spectra of a Gaussian beam point writing and amplitude mask writing into a long period grating .