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详细给出了采用传输矩阵法(TMM)分析的基于相移超结构光纤布拉格光栅(SSFBG)的相位编/解码器的理论,提出了设计方法。以长度为127切普(chip)的二相位和四相位编/解码对为例,对设计结果进行了仿真验证,通过与文献中的结果对比,进一步说明了分析方法和设计方法的正确性。仿真还比较了四相位码的A族序列和二相位码的Gold序列对光栅写入精度的灵敏度,发现在相同码长条件下,四相位码对光栅相移制作控制精度的要求要高于二相位码。
The theory of Phase Coder / Decoder based on Phase-Shifted Superstructure Fiber Bragg Grating (SSFBG) based on Transmission Matrix Method (TMM) is given in detail and the design method is proposed. Taking the two-phase and four-phase encoder / decoder pairs with a length of 127 chips as an example, the design results are verified by simulation. The correctness of the analysis method and the design method is further illustrated by comparing with the results in the literature. The simulation also compares the sensitivity of the A sequence of the four-phase code and the Gold sequence of the two-phase code to the writing accuracy of the raster, and finds that the requirements of the four-phase code for controlling the precision of the grating phase shift are higher than those of the second Phase code.