一种新型的缓变折射率环形OAM传输光纤  

A New Type of Graded-index Ring Fiber Supporting Multi-OAM Modes

作　　者：马莹莹[1] 陈鹤鸣[2] 白秀丽[1] MA Ying-yinga CHEN He-mingb BAI Xiu-lia(a. School of Optoelectronic Engineerin b. Bell Honors School, Nanjing University of Posts and Telecommunications, Nanjing 210023, China)

机构地区：[1]南京邮电大学光电工程学院,南京210023 [2]南京邮电大学贝尔英才学院,南京210023

出　　处：《光通信研究》2017年第2期43-46,共4页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61077084;61571237);江苏省自然科学基金资助项目(BK20151509);江苏省研究生科研创新计划资助项目(KYLX15_0835)

摘　　要：提出了一种可以传输16个轨道角动量模式的光纤,采用纤芯和环之间高掺杂(▽n=0.256)的缓变折射率环形光纤结构。通过有限元分析法进行仿真分析,结果表明,该光纤可以将简并模之间的有效折射率差提高到6.656×10^(-3),减小了模式之间的耦合。同时,由于光纤折射率的缓慢变化,理论上模式纯度可达到100%,从而能够有效地减小模间串扰。A new type of graded-index ring fiber with 0. 256 up-doping is proposed which can support 16 OAM modes. A Finite-Element Method （FEM） is used to calculate the effective indices of all the vector modes based on the measured index pro-file. The mode index difference can be improved to 6. 656×10^-3 , which reduces the coupling among OAM modes. Furthermore, due to the gradual change of the fiber refractive index, the purity of the synthesized OAM light can attain 100%, and thus reduce the intrinsic mode crosstalk.

关 键 词：轨道角动量 有限元分析法 有效折射率差 模间串扰 

分 类 号：TN818[电子电信—信息与通信工程]