Structured Light in Turbulence

Cox, Mitchell A.; Mphuthi, Nokwazi; Nape, Isaac; Mashaba, Nikiwe P.; Cheng, Ling; Forbes, Andrew

doi:10.48550/arxiv.2005.14586

Cited by 2 publications

(2 citation statements)

References 193 publications

(241 reference statements)

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“…Structured light is known to be perturbed in atmospheric turbulence [64]. In particular, a vector mode propagating through turbulence experiences phase dependent fluctuations that have an impact on its transverse spatial components.…”

Section: B Propagation Of Vector Modes Through Turbulence and Channel...mentioning

confidence: 99%

Vector mode decay in atmospheric turbulence: a quantum inspired analysis

Nape,

Mashaba,

Mphuthi

et al. 2020

Preprint

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Vector beams are inhomogeneously polarized optical fields with nonseparable, quantum-like correlations between their polarisation and spatial components, and hold tremendous promise for classical and quantum communication across various channels, e.g. the atmosphere, underwater, and in optical fibre. Here we show that by exploiting their quantum-like features by virtue of the nonseparability of the field, the decay of both the polarisation and spatial components can be studied in tandem. In particular, we invoke the principle of channel state duality to show that the degree of nonseparability of any vector mode is purely determined by that of a maximally nonseparable one, which we confirm using orbital angular momentum (OAM) as an example for topological charges of = 1 and = 10 in a turbulent atmosphere. A consequence is that the well-known cylindrical vector vortex beams are sufficient to predict the behaviour of all vector OAM states through the channel, and find that the rate of decay in vector quality decreases with increasing OAM value, even though the spread in OAM is opposite, increasing with OAM. Our approach offers a fast and easy probe of noisy channels, while at the same time revealing the power of quantum tools applied to classical light.

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Section: B Propagation Of Vector Modes Through Turbulence and Channel...mentioning

confidence: 99%

Vector mode decay in atmospheric turbulence: a quantum inspired analysis

Nape,

Mashaba,

Mphuthi

et al. 2020

Preprint

Self Cite

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“…The main advantage of using fixed modes is that the latter can be generated and detected using fast and compact passive devices. 12 However, pre-determined sets of modes are not designed for the propagation through atmospheric turbulence, which causes beam wandering, phase and intensity fluctuations, and other disturbances of the propagated modes. 13 These perturbations amount to turbulence-induced losses and crosstalk among spatial modes 14 and can potentially obliterate quantum communication.…”

Section: Introductionmentioning

confidence: 99%

Spatial eigenmodes of light in atmospheric turbulence

Shatokhin

Bachmann

Sorelli

et al. 2020

Environmental Effects on Light Propagation and Adaptive Systems III

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We carry out a numerical analysis of the spatial structure of the eigenmodes of light in atmospheric turbulence and assess the distribution of the singular values under variable turbulence conditions characterized by the Fried parameter and Rytov variance. Under weak scintillation, the highly transmitting eigenmodes found here possess a modal structure that is reminiscent of Laguerre-Gaussian (LG) modes and their simple superpositions. When scintillation becomes significant, we establish that the optimal eigenmodes for communication differ substantially from LG modes and tend to have highly localized transverse intensity distributions.

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Structured Light in Turbulence

Cited by 2 publications

References 193 publications

Vector mode decay in atmospheric turbulence: a quantum inspired analysis

Vector mode decay in atmospheric turbulence: a quantum inspired analysis

Spatial eigenmodes of light in atmospheric turbulence

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