光纤及双光纤扰模器远/近场扰模性能的模拟分析  

Simulation Analysis of Far and Near Field Scrambling Properties of Fibers and Double-Fiber Scrambler

作　　者：陈平[1] 黄凯 叶慧琪[2,3] 韩建[2,3] 郝志博 肖东[2,3] Chen Ping;Huang Kai;Ye Huiqi;Han Jian;Hao Zhibo;Xiao Dong(Institute of Modern Optics, College of Electronic Information and Optical Engineering,Nankai University, Tianjin 300350, China;Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories ,Chinese Academy of Sciences, Nanjing, Jiangsu 210042, China;Key Laboratory of Astronom ical Optics & Technology, Chinese Academy of Sciences,Nanjing, Jiangsu 210042, China)

机构地区：[1]南开大学电子信息与光学工程学院现代光学研究所,天津300350 [2]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [3]中国科学院天文光学技术重点实验室,江苏南京210042

出　　处：《光学学报》2019年第5期86-93,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11773044,11403069,11873071,11673046);天津市科技支撑重点项目(15ZCZDGX00250,08ZCKFGX09400)

摘　　要：在高精度视向速度测量系统中,圆形光纤逐渐被多边形光纤替代,结合多边形光纤、透镜和圆形光纤的扰模方案也被陆续提出。通过光线追迹的方法,对圆形、八边形截面的两种光纤以及基于这两种光纤的双光纤扰模器的扰模性能进行了模拟分析。模拟结果表明:虽然圆形光纤有较好的远、近场角向扰模,但是径向扰模效果不佳;八边形光纤的近场径向和角向扰模性能均较优,但远场扰模与圆形光纤没有明显差异;双光纤扰模器能有效提高光纤扰模性能,而使用了八边形光纤的双光纤扰模器的远、近场扰模性能均较优。Circular core fibers have been gradually replaced with polygonal core fibers in the high-precision radial velocity measurement systems. Further, the scrambling schemes combining polygonal fibers, lenses, or circular fibers have been subsequently proposed. This study simulated the scrambling properties of circular and octagonal fibers together with the double-fiber scrambler based on these two fibers using the ray tracing method. The simulation results show that although circular fibers have good angular scrambling properties in both the far and near fields, their radial scrambling properties are not good. For octagonal fibers, the near field scrambling is better than that of circular fibers, whereas their far field scrambling is not obviously different from that of circular fibers. A double-fiber scrambler can effectively improve the fiber scrambling performance. In addition, a double-fiber scrambler with octagonal fibers exhibits excellent scrambling performances in both the far and near fields.

关 键 词：光纤光学 视向速度测量 扰模特性 光线追迹 谱线漂移 

分 类 号：P111[天文地球—天文学]