保偏光纤偏振主轴的精确定位是保偏光纤应用中的关键技术之一。文中在观察到保偏光纤侧视图像的光强分布呈五指型的实验基础上,提出了一种用于保偏光纤定轴的新方法,即五指型光强分布特征值判断法。实测表明,用于保偏光纤定轴时,在0°附近,与现有的其它定轴方法相比,五指型光强分布特征值判断法的特征更明显,提高了定轴的灵敏度。此新方法可用于制作保偏光纤器件时,在0°附近的高精度定轴。 Precise Polarization Polarization Polarization Polarization is one of the key technologies in PM fiber applications. In this paper, based on the experiment of observing the light intensity distribution of the side-view image of polarization-maintaining fiber, this paper presents a new method for polarization-maintaining the fiber axis. The measured results show that the characteristics of the five-finger light intensity distribution eigenvalue judging method is more obvious and the sensitivity of the fixed axis is improved at around 0 ° when compared with other fixed axis methods. This new method can be used to make high-precision axising around 0 ° when making polarization-maintaining fiber optic components.