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中文摘要：
对高双折射保偏光纤内部的分布式偏振模式耦合在分布式应力传感中的应用进行了理论分析．根据光弹理论和弹性力学理论，建立了横向应力作用下保偏光纤的偏振耦合模型，推导出应力下的偏振耦合强度公式．偏振耦合强度对应力的大小，方向，作用长度以及保偏光纤的拍长都敏感．详细分析了每一个因素对耦合强度的影响．当横向应力的作用方向角为45°，作用长度为保偏光纤的一半时，这时保偏光纤耦合强度对应力传感最敏感．
英文摘要：
Distributed stress sensing based on measurement of the distributed polarization mode coupling is studied theoretically in high-birefringence polarization-maintaining optical fiber （PMF）. Based on principle of photo elastic and elasticity, the model of polarization coupling caused by transversal force is established. The coupling intensity equation is deduced from the model. The relationship between the coupling intensity and the amplitude, direction, the acting length on the fiber of the transversal force and the beat length of PMF is clarified. The influence of transversal force and beat length of PMF on coupling intensity is revealed on the theoretical analysis and numerical simulation. When the direction of force is 45 degree and the acting length on the fiber is a half of the beat length of PMF, the coupling intensity of PMF is the best sensitive to the transversal force sensing.
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