Controlling abruptly autofocusing vortex beams to mitigate crosstalk and vortex splitting in free-space optical communication

被引：86
作者：
Yan, Xu [1 ,2 ,3 ]
Guo, Lixin [1 ,2 ,3 ]
Cheng, Mingjian [1 ,3 ,4 ]
Li, Jiangting [1 ]
机构：
[1] Xidian Univ, Sch Phys & Optoelect Engn, Xian 710071, Shaanxi, Peoples R China
[2] Xidian Univ, Sch Elect Engn, Xian 710071, Shaanxi, Peoples R China
[3] Xidian Univ, Sch Telecommun Engn, State Key Lab Integrated Serv Networks, Xian 710071, Shaanxi, Peoples R China
[4] State Key Lab Pulsed Power Laser Technol, Hefei 230037, Anhui, Peoples R China
来源：
OPTICS EXPRESS | 2018年 / 26卷 / 10期
基金：
中国国家自然科学基金;
关键词：
ATMOSPHERIC-TURBULENCE; NUMERICAL-SIMULATION; IRRADIANCE-VARIANCE; PROPAGATION; WAVE; VORTICES;
D O I：
10.1364/OE.26.012605
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Orbital angular momentum (OAM) mode crosstalk induced by atmospheric turbulence is a challenging phenomenon commonly occurring in OAM-based free-space optical (FSO) communication. Recent advances have facilitated new practicable methods using abruptly autofocusing light beams for weakening the turbulence effect on the FSO link. In this work, we show that a circular phase-locked Airy vortex beam array (AVBA) with sufficient elements has the inherent ability to form an abruptly autofocusing light beam carrying OAM, and its focusing properties can be controlled on demand by adjusting the topological charge values and locations of these vortices embedded in the array elements. The performance of a tailored Airy vortex beam array (TAVBA) through atmospheric turbulence is numerically studied. In a comparison with the ring Airy vortex beam (RAVB), the results indicate that TAVBA can be a superior light source for effectively reducing the intermodal crosstalk and vortex splitting, thus leading to improvement in the FSO system performance. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
引用
收藏
页码：12605 / 12619
页数：15
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