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The plane wave expansion method is used to analyze the photonic crystal, and is translated into the scope of the fiber Bragg gratings. 利用平面波展开法对光子晶体进行理论研究 ，将研究方法移植到光纤布拉格光栅上 ，并对其进行数值分析 ，得到光栅的传输特性。