进一步推广了描述纤芯不同光纤耦合器的耦合模理论 ,用于解释被布拉格光栅破坏的两纤芯不同光纤耦合器的耦合现象 ,理论分析的结果与已报道的实验结果相符。与单独的布拉格光栅所起的反射作用不同 ,这里布拉格光栅所起的作用主要是引入了强烈的色散 ,在光栅的频谱范围内使耦合器不再同步。在被布拉格光栅破坏的光纤耦合器的选择性频谱中 ,其边缘部分出现非常弱的波动 ,而在其阻带内出现非常强的凹陷 The coupled-mode theory, which describes the different fiber-optic couplers in the core, is further generalized to explain the coupling phenomenon between two fiber-optic couplers damaged by Bragg gratings. The theoretical analysis is in good agreement with the reported experimental results. In contrast to the reflections of individual Bragg gratings, the Bragg grating here plays a major role in introducing a strong dispersion that renders the couplers out of synchronization in the spectral range of the grating. In the selective spectrum of fiber couplers destroyed by Bragg gratings, very weak ripples appear in the edge parts and very strong depressions appear in the stop band