scholarly journals Orbital angular momentum and beyond in free-space optical communications

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Jian Wang ◽  
Jun Liu ◽  
Shuhui Li ◽  
Yifan Zhao ◽  
Jing Du ◽  
...  

Abstract Orbital angular momentum (OAM), which describes tailoring the spatial physical dimension of light waves into a helical phase structure, has given rise to many applications in optical manipulation, microscopy, imaging, metrology, sensing, quantum science, and optical communications. Light beams carrying OAM feature two distinct characteristics, i.e., inherent orthogonality and unbounded states in principle, which are suitable for capacity scaling of optical communications. In this paper, we give an overview of OAM and beyond in free-space optical communications. The fundamentals of OAM, concept of optical communications using OAM, OAM modulation (OAM modulation based on spatial light modulator, high-speed OAM modulation, spatial array modulation), OAM multiplexing (spectrally efficient, high capacity, long distance), OAM multicasting (adaptive multicasting, N-dimensional multicasting), OAM communications in turbulence (adaptive optics, digital signal processing, auto-alignment system), structured light communications beyond OAM (Bessel beams, Airy beams, vector beams), diverse and robust communications using OAM and beyond (multiple scenes, turbulence-resilient communications, intelligent communications) are comprehensively reviewed. The prospects and challenges of optical communications using OAM and beyond are also discussed at the end. In the future, there will be more opportunities in exploiting extensive advanced applications from OAM beams to more general structured light.

Author(s):  
Dong Zhi ◽  
Tianyue Hou ◽  
Pengfei Ma ◽  
Yanxing Ma ◽  
Pu Zhou ◽  
...  

High-power orbital angular momentum (OAM) beams have distinct advantages in improving capacity and data receiving for free-space optical communication systems at long distances. Utilizing the coherent combination of a beam array technique and helical phase approximation by a piston phase array, we have proposed a generating system for a novel high-power beam carrying OAM, which could overcome the power limitations of a common vortex phase modulator and a single beam. The characteristics of this generating method and the orthogonality of the generated OAM beams with different eigenstates have been theoretically analyzed and verified. Also a high-power OAM beam produced by coherent beam combination (CBC) of a six-element hexagonal fiber amplifier array has been experimentally implemented. Results show that the CBC technique utilized to control the piston phase differences among the array beams has a high efficiency of 96.3%. On the premise of CBC, we have obtained novel vortex beams carrying OAM of $\pm 1$ by applying an additional piston phase array modulation on the corresponding beam array. The experimental results agree approximately with the theoretical analysis. This work could be beneficial to areas that need high-power OAM beams, such as ultra-long distance free-space optical communications, biomedical treatments, and powerful trapping and manipulation under deep potential wells.


2016 ◽  
Author(s):  
Asher J. Willner ◽  
Yongxiong Ren ◽  
Guodong Xie ◽  
Long Li ◽  
Yinwen Cao ◽  
...  

2017 ◽  
Vol 9 (3) ◽  
pp. 1-11 ◽  
Author(s):  
Xiaoke Zhang ◽  
Yanliang He ◽  
Yao Cai ◽  
Mingyang Su ◽  
Xinxing Zhou ◽  
...  

2004 ◽  
Author(s):  
Graham Gibson II ◽  
Johannes Courtial ◽  
Mikhail Vasnetsov ◽  
Steve Barnett ◽  
Sonja Franke-Arnold ◽  
...  

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Shimaa A. El-Meadawy ◽  
Ahmed E. A. Farghal ◽  
Hossam M. H. Shalaby ◽  
Nabil A. Ismail ◽  
Fathi E. Abd El-Samie ◽  
...  

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