Mitigating the cross talk of orbital angular momentum modes in free-space optical communication by using an annular vortex beam and a focusing mirror

Cao, Jiaxuan; Liang, Huijian; Zhou, Yunqin; Wu, Guannan; Pang, Xiaoyan

doi:10.3389/fphy.2022.1013729

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…[23] Wang et al explored the focused mirror method and circular aperture method to reduce OAM crosstalk of LG beams in plasma turbulence and demonstrated that the focused mirror method can be used to mitigate the effects of OAM crosstalk from turbulence better than the circular aperture one. [24] Moreover, there are focused annular vortex beams, [25] focused Bessel beams, [26] and other focused vortex beams that have high tolerance to turbulent interference and potentially other properties. [27] Compared to transport media such as atmospheric turbulence, oceanic turbulence is more complex and has a greater impact on the vortex beams passing through it.…”

Section: Introductionmentioning

confidence: 99%

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Wang 王,

Ma 马,

Yuan 袁

et al. 2024

Chinese Phys. B

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In this paper, we analysis the properties of focused Laguerre-Gaussian (LG) beam propagating through anisotropic ocean turbulence based on the Huygens-Fresnel principle. Under the Rytov approximation theory, we derive the analytical formula of the channel capacity of the focused LG beam in the anisotropic ocean turbulence, and analyze the relationship between it and the light source parameters as well as the turbulent ocean parameters. It is found that the focusing mirror can greatly enhance the channel capacity of the system at the geometric focal plane in oceanic turbulence. The results also demonstrated that the communication link can obtain high channel capacity by adopting longer beam wavelength, greater initial beam waist radius, and larger number of transmission channels. Further, the capacity of the system increases with the decrease of the mean squared temperature dissipation rate, temperature-salinity contribution ratio and turbulence outer scale factor, and the increase of the kinetic energy dissipation rate per unit mass of fluid, turbulence inner scale factor and anisotropy factor. Compared with Hankel-Bessel beam with diffraction-free characteristics and unfocused LG beam, the focused LG beam shows superior anti-turbulence interference properties, which provides a theoretical reference for the research and development of underwater optical communication links using focused LG beams.

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Section: Introductionmentioning

confidence: 99%

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Wang 王,

Ma 马,

Yuan 袁

et al. 2024

Chinese Phys. B

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Global caustic and phase chirality reversal of the focused vortex beam

Wang,

Jiang,

Yang

et al. 2023

J. Opt. Soc. Am. A

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We predict the reversal of the phase chirality before and after the focal plane during propagation based on ray tracing. The interference patterns of a focused vortex beam (FVB) and a plane beam during propagation verify the fact of phase chirality reversal through diffraction theoretical simulations and experiments. Also, we deduce an analytical expression for the caustic based on the ray equation, which effectively represents the change of the hollow light field during propagation. Simulation and experimental results demonstrate the effectiveness of the caustic in describing the variation of the global hollow dark spot radius. Furthermore, based on the caustic results at the focal plane, we customize FVBs with the same dark spot radii but different topological charges. Our research results reveal the characteristics of the light field and phase distribution of the FVB during propagation, which will expand our understanding of the properties of the FVB and provide a reference value for applications such as chiral particle manipulation and topological charge recognition.

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Mitigating the cross talk of orbital angular momentum modes in free-space optical communication by using an annular vortex beam and a focusing mirror

Cited by 2 publications

References 34 publications

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

Global caustic and phase chirality reversal of the focused vortex beam

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