两种扩束透镜光纤的研制与模场分析  

Fabrication of Two Kinds of Expanded Core Lens-Fibers and Analysis of Mode Field Diameter

作　　者：刘娅钊[1] 王福娟[1] 蔡志岗[1] 黄延毅[1] 江绍基[1] 李宝军[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室,广东广州510275

出　　处：《中国激光》2005年第10期1377-1381,共5页Chinese Journal of Lasers

基　　金：教育部科学技术研究重点项目(104144);广东省科技计划项目(重大专利)(2003A1060201);教育部留学归国人员科研启动基金(教外司留[2003]406)资助课题

摘　　要：介绍了两种对光纤端面进行修饰以扩大模场直径(MFD)的方法(加热扩散法和熔接透镜光纤法)。利用刀片远场扫描法对单模光纤(SMF)、加热扩芯光纤(TECF)与熔接透镜光纤(GIF)这两种修饰后的高斯分布光纤进行了测量比较,验证了其模场直径分别为10.700μm,13.129μm和12.717μm。并针对实际问题作出修正,通过对单模光纤以及上述两种扩束透镜光纤的分析,得到了相当合理的结果。说明这两种端面修饰法确实能起到扩大模场直径同时又不破坏模式分布的作用。并且验证了修正后的刀片法用于测量修饰后的光纤的各参量是非常有利的。Two methods were introduced to modify the end of fiber and try to get the expanded mode field diameter （MFD） in this work. In the experiments, three kinds of fibers including single-mode fiber （SMF）, thermally expanded core fiber （TECF）, and graded-index fiber lenses （GIF） were measured by using knife-edge scanning. Their MFDs were 10. 700 μm. 13. 199 μm and 12. 717 μm respectively, Considering the true situation, a modification to the theory was given, then tested for the three kinds of fibers just refered. The results of their MFDs and distance between beam waist and fiber ends are fairly correct. The conclusion is that the modified fiber has expanded mode-field diameter and Gaussian distribution. The knife edge scanning method with modification is feasible to measure the MFD of Gaussian beam with modified fiber ends.

关 键 词：光纤光学 扩束光纤 刀片扫描法 模场直径 高斯分布 

分 类 号：TN252[电子电信—物理电子学]