基于五指型光强分布的保偏光纤定轴方法

Azimuthal Alignment Method for PM Fiber Based on Light Intensity Distributions with Five Finger Profile

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。

The precision alignment of the polarization axis of polarization maintaining fiber （PMF） is one of key techniques in the applications of PMF. According to the light intensity distribution with five finger profile in our side viewing experiments of PMF, a novel method to get high precision alignment has been forwarded, named as a method of characteristics judgment in five finger profile. Experiments showed that the novel method had more obvious characteristics and improved the sensitivity of angle orientation at around 0 degree of polarization axis of panda PMF comparing with traditional methods of azimuthal alignment. The novel method could be used for fabrication of PMF devices which require high accurate azimuthal alignment at around the 0 degree of polarization axis.