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根据耦合模理论，推导出适用于纤芯为任意截面形状，而且两根保偏光纤的偏振轴非平行的保偏光纤耦合器的耦合系数计算公式，形式简单，应用方便。
According to the coupled mode theory, the coupling coefficient calculation formula for polarization-maintaining fiber couplers whose core is arbitrary cross-section and whose polarization axis is non-parallel is deduced. The formula is simple and the application is convenient.