Propagation Characteristics of Bessel-Gaussian Beam in Anisotropic Atmosphere

The orbital angular momentum (OAM) of a Laguerre–Gaussian beam (LGB) is classified using the support vector machine (SVM) model. The scintillation index, beam width, and beam wander of the Gaussian beam and the LGB at the receiving site are taken as feature vectors, and the OAM number of a LGB is taken as the label in the training and test samples. The influences on the detection accuracy of the number of training samples, the transmission distance, and the different ways of grouping OAM values are analyzed, where the detection accuracy is defined as the percentage of correctly detected OAM. The results show that only a few training samples are needed up to a range of 4000 m to achieve saturation accuracy. When the transmission distance is within 2500 m, the detection accuracy of a single SVM model in four turbulent environments ( 10−14, 10−15, ) is close to 100%. When the distance increases, detection accuracy decreases gradually, and in the range of 4000 m the detection accuracy is more than 91%. Compared with the traditional spiral spectrum expansion method, the SVM model has obvious advantages. In addition, when the range of OAM to be detected is large, the OAM values may be grouped thereby improving the accuracy when using the multi-SVM models for joint detection.

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“…Each layer of phase screens represents a turbulent environment within the transmission distance of Dz. Its fundamental expression is [30,31]…”

Section: Turbulence Effect Modelmentioning

confidence: 99%

Identifying orbital angular momentum modes in turbulence with high accuracy via machine learning

Sun

Guo

Cheng

et al. 2019

J. Opt.

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“…In 2011, Korotkova et al provided a shared oceanic turbulence model consisting of the temperature and the salinity, and they examined the variation of the light intensity and coherence characteristics of Gaussian beams in oceanic turbulence transport [11]. Subsequently, the transport properties of various beams had been investigated in the oceanic turbulence environment, such as the Airy beams, the Bessel-Gaussian (BG) beams, the Laguerre-Gaussian (LG) beams et al [12][13][14][15]. However, these beams are easily disturbed due to the complexity of the marine environment.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the transmission characters of Ince-Gaussian beams in oceanic turbulence

Li,

Zhang,

Ruan

et al. 2024

J. Opt.

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We focus on the transmission characteristics of InceGaussian (IG) beams in oceanic turbulence which is simulated by the random phase screen method. The transmission characteristics of IG beams with different distancesand turbulence intensities are also shown in the experiments. The impacts ofthe temperature and salinity in oceanic turbulence are discussed in detail. Theexperimental results show that the IG beam maintains the intensity distribution wellafter transmission. In addition, compared with the others’ structured beams, the IGbeams show better robustness in oceanic turbulence with different salinity, turbulenceintensity and suspended solids. Our work paves the way for leveraging IG beams inunderwater optical communication.

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“…Cheng Mingjian [6] studied the channel capacity of Bessel Gaussian beam in ocean turbulence based on OAM communication, derived the analytical expression of channel capacity in weak ocean turbulence, and believed that Bessel Gaussian beam has obvious advantages in reducing turbulence effect and improving communication quality in short distance transmission. Sun Ridong [7] established a phase screen simulation model of ocean turbulence by power spectrum inversion method to simulate ocean turbulence, and studied the scintillation characteristics of BGB in ocean turbulence. Wang Mingjun [8] experimentally studied the transmission characteristics of Laguerre-Gaussian vortex beams and their superimposed states in underwater turbulence, studied the influence of turbulence generated by water diffusion with different temperature and salinity differences on the transmission of Gaussian beams and superimposed Laguerre-Gaussian vortex beams, and analyzed the beam drift variance and scintillation index of four kinds of beams.…”

Section: Introductionmentioning

confidence: 99%

Scintillation index based on modified Bessel beam in ocean turbulence

Diao¹,

Wang²,

Yue³

2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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Turbulence effect is one of the key factors limiting underwater optical transmission communication. Eddy light underwater transmission can provide a new way to realize ultra-wideband and high speed underwater optical information transmission. This paper studies the scintillation index of the modified Bessel Gaussian beam propagating in ocean turbulence, analyzes the influence of wave source parameters and ocean turbulence parameters on the propagation quality of the modified Bessel Gaussian beam, and studies the transmission characteristics of the modified Bessel Gaussian beam propagating in underwater turbulence by designing experiments. The influence of turbulent flow induced by water diffusion with different temperature and salinity differences on beam propagation is considered. The theoretical and experimental results show that smaller width parameters will reduce the scintillation index of the beam under the same ocean turbulence environment. In the selection of ocean turbulence parameters, the larger turbulent kinetic energy dissipation rates and the smaller temperature salinity fluctuation equilibrium parameters can also effectively improve the beam transmission performance, and the scintillation index increases with the increase of turbulence intensity. The research results of this paper have important reference value for the research of vortex light transmission and communication in underwater channel.

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Propagation Characteristics of Bessel-Gaussian Beam in Anisotropic Atmosphere

Cited by 4 publications

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Identifying orbital angular momentum modes in turbulence with high accuracy via machine learning

Identifying orbital angular momentum modes in turbulence with high accuracy via machine learning

Investigation of the transmission characters of Ince-Gaussian beams in oceanic turbulence

Scintillation index based on modified Bessel beam in ocean turbulence

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