Reducing the cross-talk among different orbital angular momentum modes in turbulent atmosphere by using a focusing mirror

Zhou, Mengyao; Zhou, Yunqin; Wu, Guannan; Cai, Yangjian

doi:10.1364/oe.27.010280

Cited by 31 publications

(16 citation statements)

References 20 publications

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“…We optimize the OAM detection probability and crosstalk based on the method reported in [58] and [59]. These two optimization methods: circular aperture method (CAM) and focusing mirror method (FMM) are shown in Fig.…”

Section: Comparison On Optimization Of Detection Probability Using Circular Aperture Methods and Focusing Mirror Methodsmentioning

confidence: 99%

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

et al. 2021

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The explicit expression of orbital angular momentum (OAM) spiral spectrum of Laguerre-Gaussian (LG) beam propagating in anisotropic plasma turbulence is derived based on Rytov theory. The relationship between the detection probability of OAM and the crosstalk with the anisotropy parameters, topological charge, radial index, wavelength, beam width, receiving aperture, inner and outer scales are discussed in detail. In order to quantify the effect of plasma turbulence, we compared it with atmospheric turbulence based on restriction function. To optimize OAM detection probability, we also compared the effects of circular aperture method(CAM) with focusing mirror method(FMM) on the propagation characteristics of the spiral spectrum. The results show that even in the strong turbulence region of atmospheric turbulence, the radial dimension of LG beam in plasma turbulence is nearly twice that of atmospheric turbulence and the modes crosstalk has almost reached its upper bound. Besides, by comparing the two optimization methods, we found the ability to reduce crosstalk is related to the choice of beam width and receiving aperture. Therefore, we give a method to optimally select between the CAM and the FMM. We found the corresponding relationship and gave an analytical formula. The FMM has a greater ability to reduce crosstalk than the CAM when the beam width≥4cm and the aperture≥3cm. We quantified the effect of plasma turbulence and provide a guideline for the selection of beam width and receiving aperture under these two optimization methods. The research results may be helpful in the field of optical communication.

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Section: Comparison On Optimization Of Detection Probability Using Circular Aperture Methods and Focusing Mirror Methodsmentioning

confidence: 99%

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

et al. 2021

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“…This case was discussed in Ref. [27], which was proposed as a new method, using a focusing mirror, to reduce the cross-talk among different OAM modes in turbulent atmosphere. There, for simplicity, the basic Gaussian beam was adopted, but the special beam is used in the present paper.…”

Section: Basic Theorymentioning

confidence: 99%

“…In the present paper, we will study the OAM spectrum of an annular vortex beam in weak turbulent atmosphere. It is found that it, combined with the method that we proposed in recent paper [27], can be used to reduce the cross-talk of OAM modes.…”

mentioning

confidence: 99%

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

Liang²,

Zhou³

et al. 2022

Front. Phys.

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The probability density analysis formula of the single orbital angular momentum (OAM) mode of an annular vortex beam with a focusing mirror in a turbulent atmosphere is derived theoretically, and the effects of different parameters on the OAM spectrum are investigated numerically, and the results show that the OAM diffusion of the annular vortex beam is weaker than the Gaussian vortex beam in a turbulent atmosphere under the same conditions, and the annular vortex beam with a focusing mirror can more effectively reduce the crosstalk of OAM modes. Our findings will be useful for improving FSO system performance.

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“…In consideration of turbulence effects on spatial beam for coupling, Rytov approximation is used in weak turbulence regime. At this time, the turbulence perturbation on beam can be regarded as a pure phase perturbation [15]- [17]. So Eq.…”

Section: Theoretical Analysismentioning

confidence: 99%

Investigation on the Coupling of Vortex Beam Into Parabolic Fiber in Turbulent Atmosphere

Zhang

2019

IEEE Photonics J.

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Aiming at the demand for high-capacity wireless-fiber link, the coupling efficiency of Laguerre Gaussian (LG) vortex beam into parabolic fiber under atmospheric turbulence is first investigated. The coupling model is established based on vortex mode analysis in free space and fiber. Effects of turbulence on coupling efficiency are analyzed, from which the way for system optimization is proposed to mitigate the efficiency decline. We find that LG beam with small OAM number, low radial index and long wavelength is able to achieve higher coupling efficiency in turbulent atmospheric conditions. As for the transmitting beam waist of LG beam or the focal length of receiving lens, there exist optimal values to realize size matching between spatial and fiber modes for coupling. The results are beneficial to the design of coupling system.

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Reducing the cross-talk among different orbital angular momentum modes in turbulent atmosphere by using a focusing mirror

Cited by 31 publications

References 20 publications

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

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

Investigation on the Coupling of Vortex Beam Into Parabolic Fiber in Turbulent Atmosphere

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