提出一步定轴法以提高保偏光纤偏振轴定位和对准技术中侧视成像法的定轴效率.一步定轴法通过光强图像与标准图库之间的相关运算实现定轴,定轴过程中不需要旋转光纤.采用光强内插处理以及选择最佳观测平面两种措施提高一步定轴法的定轴准确度.以熊猫型保偏光纤为研究对象,利用光线追迹法仿真计算出不同观测面的光强图像.以相关峰值处的尖锐程度作为定轴准确度的判据,分析内插前后以及不同观测面的定轴准确度.结果表明,这两种措施均可提高定轴准确度,并获得优于0.3°的理论定轴准确度.

Based on side-view imaging,the one-step method was proposed to achieve higher alignment efficiency in the location and alignment of polarization axes of polarization-maintaining fibers.In comparison with side-view imaging,one-step method is not necessary to rotate fibers in alignment process,for azimuth aligning can be realized by operating correlation between light-intensity profiles and the standard library of light-intensity profiles.In order to improve the alignment precision for the one-step method,the interpolation method and optimized observation method were putted forward.To test the reliability of these measures,light-intensity profiles of panda fibers of different observation surfaces were simulated by using ray-tracing method.Then the cross correlations were done among light-intensity profiles of the same observation surfaces.The sharp degree of correlation-curve peak was implemented for the estimation of alignment precision.The alignment precision among different observation position was analyzed with and without interpolation.According to the final result,with these two measures alignment precision is improved substantially and a theoretical precision better than 0.3° is achieved.