抛物线指数环形芯光纤支持高纯度轨道角动量模式。

Parabolic-Index Ring-Core Fiber Supporting High-Purity Orbital Angular Momentum Modes.

机构信息

Institute of Modern Optics, Nankai University, Tianjin 300350, China.

Department of Electrical & Computer Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA.

出版信息

Sensors (Basel). 2023 Mar 31;23(7):3641. doi: 10.3390/s23073641.

DOI:10.3390/s23073641

PMID:37050703

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10098886/

Abstract

We design a graded-index ring-core fiber with a GeO-doped silica ring core and SiO cladding. This fiber structure can inhibit the effect of spin-orbit coupling to mitigate the power transfer among different modes and eventually enhance the orbital angular momentum (OAM) mode purity. By changing the high-index ring core from the step-index to parabolic graded-index profile, the purity of the OAM mode can be improved from 86.48% to 94.43%, up by 7.95%. The proposed fiber features a flexible structure, which can meet different requirements for mode order, effective mode area, etc. Simulation results illustrate that the parabolic-index ring-core fiber is promising in enhancing the OAM mode purity, which could potentially reduce the channel crosstalk in mode-division-multiplexed optical communication systems.

摘要

我们设计了一种具有掺锗二氧化硅环芯和二氧化硅包层的渐变折射率环芯光纤。这种光纤结构可以抑制自旋轨道耦合的影响，减轻不同模式之间的功率转移，最终提高轨道角动量（OAM）模式纯度。通过将高折射率环芯从阶跃指数改为抛物线渐变指数分布，OAM 模式的纯度可以从 86.48%提高到 94.43%，提高了 7.95%。所提出的光纤具有灵活的结构，可以满足不同模式阶数、有效模式面积等的要求。仿真结果表明，抛物线折射率环芯光纤有望提高 OAM 模式纯度，从而降低模式分复用光通信系统中的信道串扰。