保偏光纤侧视光强相关峰锐度的定轴方法

在保偏光纤偏振轴的定位和对准技术中，侧视成像法为目前的主要方法。现有的侧视成像法对光强形貌特征具有较高要求，为了提高它们的通用性，提出了基于侧视光强相关峰锐度的定轴方法。该方法首先通过侧视光强曲线间的相关运算得到相关系数曲线，进而利用相关系数曲线的峰值尖锐程度作为特征值。相比于传统侧视成像法，该方法不受光强形貌特征的限制，因此具有更强的通用性。为了提高该方法的精度，对不同观测平面的定轴精度进行了比较，从而确定了具有理想定轴精度的观测平面范围。在此基础之上，对该方法的实际精度进行了实验验证，结果表明:利用该方法可以获得优于0.9的定轴精度。

Alignment method based on peak's sharpness degree of correlation coefficient profile of sid-view images for polarization maintaining fibers

The sid-vie-image methods are playing important roles in the location and alignment of birefringent axes of Polarization Maintaining (PM) fibers. However, due to be restricted by ligh-intensity distribution characteristics, almost all of the sid-vie-image methods were of low applicability. In order to improve the applicability of sid-vie-image methods, a new alignment algorithm based on the peak's sharpness degree of correlation coefficient profile was developed. Correlation coefficient profiles were acquired by calculating the correlation among ligh-intensity profiles, then the peak's sharpness degree of correlation coefficient profiles was denoted as characteristic value. Compared with traditional sid-vie-image methods, the novel method was not restricted by ligh-intensity characteristics, so it shows excellent applicability. To improve the precision of angle orientation, alignment accuracy was measured on different observation planes in a series of experiments and the observation position with high alignment precision was acquired. Finally, the alignment precision of these position was analyzed with the help of practical experiment. According to the experiment result, alignment accuracy better than 0.9 is achieved.