Free-space information transfer using the elliptic vortex beam with fractional topological charge

Zhang, Xiaohui; Xia, Tian; Cheng, Shubo; Tao, Shaohua

doi:10.1016/j.optcom.2018.09.035

Cited by 36 publications

(8 citation statements)

References 25 publications

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“…Returning from the coordinates (12) to the original coordinates, we obtain the final expression for the complex amplitude:…”

Section: Propagation-invariant Elliptic Gaussian Beamsmentioning

confidence: 99%

“…For example, as shown in [10], adopting elliptic vortex beams for optical data transmission in a turbulent atmosphere reduces the scintillation index [11]. In [12], elliptic vortex beams with a fractional topological charge (number of 2π phase jumps along a contour encompassing either a single optical vortex, i.e., local topological charge, or the whole beam [13]) are used in free-space information transfer to increase the throughput and security. In [14], partially coherent four-petal elliptic Gaussian beams are investigated, also in turbulent atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Propagation-Invariant Off-Axis Elliptic Gaussian Beams with the Orbital Angular Momentum

2021

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We studied paraxial light beams, obtained by a continuous superposition of off-axis Gaussian beams with their phases chosen so that the whole superposition is invariant to free-space propagation, i.e., does not change its transverse intensity shape. Solving a system of five nonlinear equations for such superpositions, we obtained an analytical expression for a propagation-invariant off-axis elliptic Gaussian beam. For such an elliptic beam, an analytical expression was derived for the orbital angular momentum, which was shown to consist of two terms. The first one is intrinsic and describes the momentum with respect to the beam center and is shown to grow with the beam ellipticity. The second term depends parabolically on the distance between the beam center and the optical axis (similar to the Steiner theorem in mechanics). It is shown that the ellipse orientation in the transverse plane does not affect the normalized orbital angular momentum. Such elliptic beams can be used in wireless optical communications, since their superpositions do not interfere in space, if they do not interfere in the initial plane.

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“…Returning from the coordinates (12) to the original coordinates, we obtain the final expression for the complex amplitude:…”

Section: Propagation-invariant Elliptic Gaussian Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Propagation-Invariant Off-Axis Elliptic Gaussian Beams with the Orbital Angular Momentum

2021

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“…Therefore, the interactive crosstalk is reduced during transmission, and communication system capacity can be infinitely improved, theoretically. At present, vortex beams with integer and fractional topological charge number have been utilized in the fields of particle manipulation, [6][7][8][9] high-capacity and high-rate communication, [10][11][12][13] quantum information, [14,15] and super-resolution microscopy imaging. [16] However, in practical applications, the ring radius of vortex beams increases rapidly as topological charge number increases, and gradually increases along the propagation direction.…”

Section: Introductionmentioning

confidence: 99%

Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon

Tu 涂,

Liu 刘,

Liu 刘

et al. 2024

Chinese Phys. B

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We have proposed a new method to generate terahertz perfect vortex beam with integer-order and fractional-order. A new optical diffractive element which is composed of the phase combination of a spherical harmonic axicon and a spiral phase plate is designed, and called spiral spherical harmonic axicon. A terahertz Gaussian beam passes through the spiral spherical harmonic axicon to generate a terahertz vortex beam. When only increasing the number of topological charges carried by spiral spherical harmonic axicon, the ring radius of terahertz vortex beam increases slightly, so it is a terahertz quasi-perfect vortex beam. Importantly, the terahertz quasi-perfect vortex beam can carry not only integer-order but also fractional-order topological charges. This is the first time that vortex beam and quasi-perfect vortex beam with fractional-order has been successfully realized in terahertz domain and experiment.

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“…Due to the unique wavefront phase distribution and orbital angular momentum (OAM) properties of vortex beams [1] , vortex beams have a wide range of applications in optical communications [2] , optical imaging [3] , remote sensing [4][5] and other fields. The long-distance propagation of OAM beam demands a high output power.…”

Section: Introductionmentioning

confidence: 99%

Optimization for coherent combined vortex fiber array with phase correction

Qin

Quan

2023

Eighth International Conference on Electronic Technology and Information Science (ICETIS 2023)

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The main factors limiting the long-distance application of vortex beam are the low receiving power and the wavefront phase distortion caused by atmosphere turbulence. Coherent beam combining (CBC) technology is an effective way to generating high power vortex beams. However, most common coherent combined vortex (CCV) fiber array is currently based on a single-ring structure with limited output power enhancement. In this paper, a dual-ring fiber array is developed to achieve higher output power and improved stochastic-parallel-gradient-descent (SPGD) correction accuracy. To improve SPGD correction speed, cross-grouping method is used. The results show that CCV beam in dual-ring structure can maintain good intensity distribution and mode distribution after SPGD correction.

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Free-space information transfer using the elliptic vortex beam with fractional topological charge

Cited by 36 publications

References 25 publications

Propagation-Invariant Off-Axis Elliptic Gaussian Beams with the Orbital Angular Momentum

Propagation-Invariant Off-Axis Elliptic Gaussian Beams with the Orbital Angular Momentum

Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon

Optimization for coherent combined vortex fiber array with phase correction

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