Theoretical analysis and numerical calculation for the transmission spectrum of long-period fiber gratings with a rectangular index modulation
矩形折射率调制型长周期光纤光栅传输谱的理论分析及数值计算

In this paper, we present a theoretical method to analyze the spectral characteristics of long-period fiber gratings (LPGs) with a rectangular index modulation. Furthermore, we numerically calculate the transmission spectrum of a long-period grating written in Corning FlexcorTM 1060 fiber. The calculation results agree with the experimental results.