一种新型的缓变折射率环形OAM传输光纤

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。

Abstract

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 profile. 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.

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马莹莹, 陈鹤鸣, 白秀丽. 一种新型的缓变折射率环形OAM传输光纤[J]. 光通信研究, 2017, 43(2): 43. MA Ying-yinga, CHEN He-mingb, BAI Xiu-lia. A New Type of Graded-index Ring Fiber Supporting Multi-OAM Modes[J]. Study On Optical Communications, 2017, 43(2): 43.

一种新型的缓变折射率环形OAM传输光纤

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