基于匹配液背投光方法实现保偏光纤高精度的实时定轴  

Real-time and High Accuracy Alignment Method of Polarizationmaintaining Fiber Based on Back Projection Light through Matching Liquid

作　　者：李萌 马修泉 洪春权 胡畅 许天宇 LI Meng;MA Xiuquan;HONG Chunquan;HU Chang;XU Tianyu(GZ Photonics Technology Co.,Ltd.,Dongguan,Guangdong 523000,China;State Key Laboratory of Digital Manufacturing Equipment and Technology,School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Guangdong Intelligent Robotics Institute,Dongguan,Guangdong 523808,China)

机构地区：[1]广东国志激光技术有限公司,广东东莞523000 [2]华中科技大学机械科学与工程学院数字制造装备与技术国家重点实验室,武汉430074 [3]广东省智能机器人研究院,广东东莞523808

出　　处：《光子学报》2022年第4期60-69,共10页Acta Photonica Sinica

基　　金：广东省重点领域研发计划项目(No.2018B090944001)。

摘　　要：以熊猫保偏光纤为研究对象,在使用甘油和去离子水配制匹配液的基础上,采用非相干平行光源背投光的方法实现了保偏光纤轴观测的高精度可视化。通过将旋转电机与成像系统相结合,在Labview平台上实现直接观测并实时提取含有保偏光纤偏振轴的光强分布信息。通过计算机处理光强分布进一步得出特征区与偏振轴角度的关系,从而实现保偏光纤偏振轴与观察面的实时夹角判别。采集信息经过归一化与二维小波算法重构图像边缘后进一步提高了定轴技术的准确性,偏差率优于1.32%,定轴精度可达±0.3°。The traditional polarization-maintaining fiber alignment method is divided into longitudinal and lateral observation methods. However,both of them have severe defects. For example,the longitudinal observation method limits the application scenarios due to the destruction of the polarization fiber in the detection section. In contrast,the widely used lateral observation method requires high standards for experimental equipment and complex manual operations and alignment algorithms. Regarding the panda polarization maintaining fiber as the research object,instead of the traditional polarization-maintaining fiber alignment thinking of applying a high standard light source and adjusting the imaging surface. Based on applying the matching liquid mixed with glycerin and deionized water,the ideal refraction environment can be created due to the reduced effects of multiple spherical aberrations. Hence,high accuracy visualization can be achieved by projection from the incoherent parallel light sources. Then,applying the rotating motor with a fiber clamp setup and imaging system to form an experimental device,a long-distance section of the polarization-maintaining fiber can be aligned. Additionally,the LabVIEW platform can demonstrate the results of direct observation and real-time extraction of light intensity distribution information,which contains angle information of the polarization axis from the polarization-maintaining fiber. This information can also be called the characteristic value of the high accuracy alignment method,i.e.,the three segment diffraction fringe spaces d;,d;,d;,which are sensitive to the polarization axis angle θ inside the polarization-maintaining fiber. According to the internal structure of the polarization-maintaining fiber and the geometric characteristics of the eigenvalue,the geometric relationship between the eigenvalue and the angle of the polarization axis θ of the polarization-maintaining fiber can be deduced theoretically.Furthermore,through computer processing of the experimental da

关 键 词：保偏光纤 实时定轴 归一化 二维小波重构 曲线拟合 

分 类 号：TN253[电子电信—物理电子学]