中文摘要：

作用在保偏光纤上的横向应力可以引起偏振耦合现象,通过测量耦合强度可以检测应力的位置和大小,实现应力传感。设计了应力施加装置,包括底座、手动微位移台、数显测力计、施力探头、旋转台、光纤夹持机构和受力支架。在1根直径125μm,拍长2.1mm的保偏光纤上进行了应力大小和作用长度对偏振耦合强度影响的实验研究。结果表明作用长度为拍长一半的奇数倍时,耦合强度最大。在部分区域耦合强度和应力大小成线性关系,可应用于应力传感器中。

英文摘要：

Transversal force on the fiber can cause the polarization coupling in the polarization-maintaining fiber（PMF）. The position and amplitude of the transversal force can be gotten by measuring the coupling intensity so that the stress sensing can be realized. The transversal force loading system is designed, which consists of the pedestal, adjust stage, digital display ergometer, loading force probe, rotating stage, fiber holder and bracket. The influences of the amplitude, acting length and the direction of the transversal force on the coupling intensity in the with a 125 μm diameter and the 2. 1 mm beat length the PMF is studied. The experimental result indicates that the coupling intensity of the PMF is the best sensitive to the trans versal force when the acting length is the odd times of the half of the beat length of PMF. The linear relation between the coupling intensity and amplitude of transverse force is proved in the part region and the polarization coupling in the PMF can be applied in the stress sensing.