阶跃型多模光纤的选择性模式激励  

Selective Mode Excitation of Step-index Multimode Fiber

作　　者：李影[1] 谭中伟[1] 孙剑[1] 刘艳[1] 李唐军[1] 

机构地区：[1]北京交通大学光波技术研究所,全光网络与现代通信网教育部重点实验室,北京100044

出　　处：《光电技术应用》2016年第1期11-15,40,67,共7页Electro-Optic Technology Application

基　　金：国家自然科学基金(61177012);北京高等学校“青年英才”计划(YETP0529);中央高校基本科研业务费专项资金(2013JBM005)

摘　　要：随着光信息处理技术的发展,基于光纤模式色散的光信息处理技术也开始得到了关注,但是如何准确地激励出满足条件的模式一直限制着其应用。对于渐变多模光纤的模式激励已经有解析解,阶跃多模光纤的模式激励没有解析解,然而基于模式色散的光信息处理需要采用阶跃光纤来引入较大的模式色散。文中用Matlab数值仿真讨论阶跃光纤的模式激励。仿真结果表明,改变高斯光束的入射条件,例如偏移光束、倾斜光束、改变光束束腰半径,均能得到不同的激励模式。最后,通过实验验证了倾斜光束时的模式激励和模间色散的情况。With the rapid development of optical information processing technology, optical information pro-cessing technology based on multimode fiber dispersion is concerned. However, how to exactly excite the requiredmodes has limited the application. There is the analytical solution for graded-index multimode fiber, but not forstep-index multimode fiber. Step-index multimode fiber is more suitable for the optical information processing sinceit has large mode dispersion. The mode excitation of step-index fiber is discussed through Matlab simulation. Simu-lation results show that different excitation modes can be obtained by changing the conditions of the incident Gauss-ian beam such as offsetting beam, tilting beam, changing the radius of the beam waist. At last, the mode excitationof tilting beam and the modal dispersion of the fiber are tested through experiments.

关 键 词：模式激励 功率耦合系数 高斯光束 阶跃型光纤 

分 类 号：TN915.63[电子电信—通信与信息系统]