High-base vector beam encoding/decoding for visible-light communications

Zhao, Yifan; Wang, Jian

doi:10.1364/ol.40.004843

Cited by 202 publications

(78 citation statements)

References 13 publications

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“…In principle, l can take arbitrary integer number ranging from −∞ to +∞, and OAM modes with different l values are intrinsic orthogonal. Similar to other mode bases in free space or fibre 33–35 , OAM modes are another mode basis with which to represent spatial modes. One can use different mode bases for MDM, and so does OAM modes.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre

Shi

Wang

2017

Sci Rep

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Orbital angular momentum (OAM) modes are another mode basis to represent spatial modes. There have been increasing interests in exploiting OAM modes in specialty fibres. In this paper, we present a comprehensive characterisation of OAM modes in conventional graded-index multimode fibre (MMF). 1) We synthesise the circularly polarized OAM modes by properly combining two fold degenerate cylindrical vector modes (eigenmodes) and analyse the total angular momentum, i.e. spin angular momentum and orbital angular momentum. 2) We divide all the OAM modes of the conventional graded-index MMF into 10 OAM mode groups with effective refractive index differences between different mode groups above 10−4 enabling low-level inter-group crosstalk. 3) We study the chromatic dispersion, differential group delay, effective mode area, and nonlinearity for each OAM mode group over a wide wavelength ranging from 1520 to 1630 nm covering the whole C band and L band. 4) We discuss the performance tolerance to fibre ellipticity and bending. 5) We further address the robustness of performance against fibre perturbations including the core size, index contrast and the imperfect index profile of the practically fabricated MMFs. The obtained results may provide theoretical basis for further space-division multiplexing applications employing OAM modes in conventional graded-index MMF.

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Section: Introductionmentioning

confidence: 99%

Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre

Shi

Wang

2017

Sci Rep

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“…Since the orbital angular momentum associated with the spiral phase of Laguerre‐Gaussian (LG) beams was demonstrated by Allen et al. in 1992, the light fields that contain phase singularities have been extensively investigated and applied to various realms, including optical imaging, particle manipulation, optical information storage, communication, and so on . Recently, a new family of null solutions to Maxwell's equations in 3D, whose vorticity line (connected phase singularities in 3D space) is connected as isolated loop in the forms of knots and links, has been reported and attracted increasing interest, because of its nontrivial spatial feature.…”

Section: Introductionmentioning

confidence: 99%

Tying Polarization‐Switchable Optical Vortex Knots and Links via Holographic All‐Dielectric Metasurfaces

Guo

Zhong

et al. 2020

Laser & Photonics Reviews

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Tailoring the spatial structure of light field in multiple degrees of freedom is a research hotspot in recent years. The topology of light field, as one of the most fascinating structures, such as vortex knots and links associated with the phase singularities, is evoking increasing attention both in fundamental research and practical application. Here, an all‐dielectric metasurface device is proposed and experimentally demonstrated that can construct vortex knots and links in light field at the micro scale. These two distinct topological configurations can be switched by changing the incident polarization. Utilizing the digital holographic interference method, these topological configurations of vorticity lines are accurately characterized in three‐dimensions, and the topology‐preserving evolution of such ultra‐small fields is demonstrated. These two classical configurations exemplify the capability of multichannel manipulating topology by compact metadevice. The work may promote the application of structured light filed at the micro scale and even the creation of other physical fields with ultra‐small size.

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“…Both VB and CVB has attracted much attention due to their unique optical properties and have shown exciting perspective in various applications ranging from optical manipulation to imaging and optical communication etc 3–13 . Especially for optical communication, it is believed that the phase singularity and vector singularity can be used as new multiplexing/modulation dimension to improve the communication capacity and capacity density 7, 8, 11–13 . More interestingly, the spatially inhomogeneous polarization and helical phase wavefront can coexist in one light beam and thus form cylindrical vector vortex (CVV) beam, which can provide additional degrees of freedom for beam manipulation 14, 15 .…”

Section: Introductionmentioning

confidence: 99%

Switchable phase and polarization singular beams generation using dielectric metasurfaces

He¹,

Liu

et al. 2017

Sci Rep

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Singular beams which possess helical phase wavefront or spatially inhomogeneous polarization provide new freedom for optical field manipulation. However, conventional schemes to produce the singular beams have difficulty in realizing the flexible switch between different singular beams. In this work, we have experimentally demonstrated the capability of dielectric metasurfaces to generate three types of singular beams and switch between them at working wavelength of 1550 nm. We have shown vortex beam and cylindrical vector beam generation with single metasurface and cylindrical vector vortex beam generation with two cascaded metasurfaces. Moreover, experimental demonstration on switching cylindrical vector beam into vortex beam has also been done by combining one quarter-wave plate and a Glan laser polarizer. The experimental results match well with the analysis from the Jones matrix calculations. The average conversion efficiency of cylindrical vector beam to vortex beam was estimated to be 47.7%, which was about 2.3% lower than the theoretical prediction.

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High-base vector beam encoding/decoding for visible-light communications

Cited by 202 publications

References 13 publications

Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre

Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre

Tying Polarization‐Switchable Optical Vortex Knots and Links via Holographic All‐Dielectric Metasurfaces

Switchable phase and polarization singular beams generation using dielectric metasurfaces

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