Effects of angular misalignment in interferometric detection of distributed polarization coupling
Effects of angular misalignment in interferometric detection of distributed polarization coupling
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DOI：
10.1088/0957-0233/20/9/095112
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发表时间：
2009-09
影响因子：
2.4
通讯作者：
Hongxia Zhang;Tianhua Xu;Dagong Jia;Wencai Jing;Kun Liu;Yimo Zhang
中科院分区：
文献类型：
--
作者：
Hongxia Zhang;Tianhua Xu;Dagong Jia;Wencai Jing;Kun Liu;Yimo Zhang
采用白光干涉法测量保偏光纤中的分布偏振耦合。通过使用扫描迈克尔逊干涉仪对偏振模双折射引起的光程差进行补偿，可以得到耦合强度和耦合点的位置。在理想的DPC测量中，迈克尔逊干涉仪固定臂和扫描臂上的两个反射镜彼此垂直。但在实际应用中，可移动反射镜不能与固定反射镜精确对准，从而导致角度不对准。角度不对准会引起OPD的变化，从而降低条纹的可见度。并进行了相应的理论仿真研究。因此，角度误差会导致对偏振耦合强度的错误计算。在实验结果的基础上，提出了修正的耦合强度计算公式，以最大限度地减小角度失调的影响。
White light interferometry is used to measure the distributed polarization coupling (DPC) in polarization-maintaining fibers (PMFs). By using a scanning Michelson interferometer to compensate the optical path difference (OPD) induced by the modal birefringence of PMFs, both the coupling strength and positions of the coupling points can be acquired. In ideal DPC measurement, the two reflective mirrors on the fixed and scanning arms of the Michelson interferometer are normal to each other. But in practice, the movable reflective mirror cannot be aligned normally to the fixed mirror exactly, which leads to an angular misalignment. The angular misalignment causes a variation of the OPD, which will reduce the fringe visibility. The theoretical simulation is investigated correspondingly. Consequently, the angular error leads to the miscalculation of the polarization coupling intensity. Based on the experimental results, a revised coupling strength calculation equation is proposed to minimize the influence of angular misalignment.