Orbital Angular Momentum (OAM) Carried by Asymmetric Vortex Beams for Wireless Communications: Theory, Experiment and Current Challenges

Yan, Baoluo; Lu, Zehui; Hu, Jianping; Xu, Tianxu; Zhang, Hao; Lin, Wei; Yue, Yang; Liu, Haifeng; Liu, Bo

doi:10.1109/jstqe.2020.3004665

Cited by 38 publications

(7 citation statements)

References 34 publications

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“…Due to the perpendicularity and completeness of OAM, the OAM has in nite-dimensional Hilbert space and can carry in nite-dimensional information, so it allows for an increase in the channel transmission capacity. us, it has been widely used in optical communication systems in free space and turbulent environments [15].…”

Section: Introductionmentioning

confidence: 99%

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Alkelly

Khaled

Hassan

2022

International Journal of Optics

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The propagation properties of partially coherent circular flat-topped (FT) vortex hollow/nonvortex beams are studied in anisotropic turbulent plasma. The analytical expression of the optical intensity of these beams is obtained by employing the extended Huygens–Fresnel integral. The effects of the source and turbulent plasma parameters on the intensity distribution of partially coherent circular FT vortex hollow/nonvortex beams are analyzed numerically. The results show that partially coherent circular FT vortex hollow/nonvortex beams will finally converge into a Gaussian intensity profile at increasing propagation distances. The results also showed that the partially coherent FT vortex hollow/nonvortex beams with higher coherence are less affected by anisotropic turbulent plasma than the less coherent beams.

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Section: Introductionmentioning

confidence: 99%

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Alkelly

Khaled

Hassan

2022

International Journal of Optics

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“…Recently, FSO using orbital angular momentum (OAM) has attracted a considerable attention as an emerging candidate for technology beyond the 5th generation, due to its potential as a means of permitting high-speed wireless transmission [2]. Since OAM can be used to establish multiple independent channels, wireless OAM multiplexing can effectively increase the transmission rate in a point-to-point link, such as wireless backhaul and/or fronthaul [3]. In [4], Kai et al suggested an FSO communication scheme that uses OAM-shift-keying (OAM-SK) as a modulation technique, where an encoded image is transmitted by a series of OAM states.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of 3D Video Transmission Over Deep-Learning-Based Multi-Coded N-ary Orbital Angular Momentum FSO System

et al. 2021

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Orbital angular momentum-shift keying (OAM-SK), which is the rapid switching of OAM modes, is vital but seriously impeded by the deficiency of OAM demodulation techniques, particularly when videos are transferred over the system. Thus, in this paper, 3D chaotic interleaved multi-coded video frames (VFs) are conveyed via an N-OAM-SK free space optic (FSO) communication system to enhance the reliability and efficiency of the model. To tackle the defects of the OAM-SK-FSO mechanism, two efficient deep learning (DL) techniques, namely convolution recurrent neural network (CRNN) and 3D convolution neural network (3DCNN) are used to decode OAM modes with a lower BER. Moreover, a graphics processing unit (GPU) is used to accelerate the training process with slight power consumption. The utilized datasets for OAM states are generated by applying different scenarios using trial and error method. The simulation results imply that LDPC coded VFs achieve the greatest peak signal-to-noise ratios (PSNRs) and the lowest BERs using the 16-OAM-SK model. Both 3DCNN and CRNN techniques have nearly the same performance, but this performance deteriorates in the case of larger dataset classes. Moreover, the GPU accelerates the performance by almost 67.6% and 36.9% using CRNN and 3DCNN techniques, respectively. These two DL techniques are more effective in evaluating the classification accuracy than the other traditional techniques by almost 10 − 20%.

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“…There was even an article focused on the Lommel beam in OAMmultiplexed free-space optical communication links recently, which introduced the advantages and challenges of the Lommel mode in optical communication. [22] However, to the best of our knowledge, no one, has proposed the auto-focusing Lommel Gaussian vortex beam (ALoGVB).…”

Section: Introductionmentioning

confidence: 99%

Free Space Realization of the Symmetrical Tunable Auto‐Focusing Lommel Gaussian Vortex Beam

Wang

et al. 2021

Annalen der Physik

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An auto-focusing beam with adjustable symmetry is proposed numerically and experimentally. The initial field of the auto-focusing Lommel Gaussian vortex beam (ALoGVB) consists of the Lommel function and the Gaussian term. When the asymmetry factor 𝜺 of the beam approaches zero, the ALoGVB will degenerate into a circular Bessel Gaussian vortex beam (CBGVB). Compared with the CBGVB, the ALoGVB is more diverse. The shape, symmetry, normalized focusing intensity, and focus distance of the ALoGVB can be controlled by flexibly adjusting the asymmetry factor 𝜺 and the topological charge n. In addition, the effect of off-axis vortices on the propagating characteristics of the beam is also discussed. The experiment is in good agreement with the numerical simulation. The results could be beneficial for potential applications in optical trapping or micromachining.

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Orbital Angular Momentum (OAM) Carried by Asymmetric Vortex Beams for Wireless Communications: Theory, Experiment and Current Challenges

Cited by 38 publications

References 34 publications

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Performance Analysis of 3D Video Transmission Over Deep-Learning-Based Multi-Coded N-ary Orbital Angular Momentum FSO System

Free Space Realization of the Symmetrical Tunable Auto‐Focusing Lommel Gaussian Vortex Beam

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