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根据耦合模理论,采用传输矩阵法分析了相位掩模法制作的光纤布拉格光栅的反射谱特性。设计了一种新的写制光纤光栅的光路,利用高斯激光光束写制出具有短波自致啁啾效应的切趾光栅(栅长0.015 m)。对具有短波自致啁啾效应的光纤光栅进行了物理切割(剩余光栅的长度分别取0.007 m和0.0055 m),得到了一种新型的具有长波自致啁啾效应的光纤光栅,原本的自致啁啾光栅反射谱中旁瓣分布在短波长方向,而得到的新型自致啁啾光栅的反射谱中长波长方向的旁瓣更为明显。基于对光纤布拉格光栅自致啁啾效应的分析,提出一种新型类高斯切趾函数,以此函数对自致啁啾效应进行数值模拟,得到了与实验结果相一致的光谱图。
According to the coupled mode theory, the transmission matrix method is used to analyze the reflection spectrum of fiber Bragg grating fabricated by phase mask method. The optical path of a new fiber grating is designed. The grating of apodized grating with self-chirped effect is written by Gaussian laser beam with a grating length of 0.015 m. The fiber grating with shortwave self-chirped effect is physically cut (the residual grating length is taken as 0.007 m and 0.0055 m respectively), a new type of fiber grating with long-wave self-induced chirp effect is obtained. The original self- The side lobes in the chirped grating reflectance spectrum are distributed in the short wavelength direction, and the side lobes in the long wavelength direction of the new self-induced chirped grating are more obvious. Based on the analysis of the self-induced chirp effect in fiber Bragg grating, a new type of Gaussian apodized function is proposed. By this function, the self-induced chirp effect is numerically simulated and the spectrogram consistent with the experimental results is obtained.