Orbital-angular-momentum crosstalk and temporal fading in a terrestrial laser link using single-mode fiber coupling

Funes, Gustavo; Vial, Matías; Anguita, Jaime A.

doi:10.1364/oe.23.023133

Cited by 33 publications

(15 citation statements)

References 18 publications

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“…where j S j is the sum of the intensities in all the modes, including mode i. Experimental results have shown that a Johnson-SB fading distribution is a good fit for OAM modes [91][92][93], however, there has been no work identifying how the (numerous) parameters of the Johnson-SB distribution map to standard variables such as C 2 n or r 0 . There has been no experimental work determining the fading distributions in real atmosphere for other higher-order mode sets such as the HG, IG or even LG modes where p = 0.…”

mentioning

confidence: 99%

Structured Light in Turbulence

Cox

Mphuthi

Nape

et al. 2021

IEEE J. Select. Topics Quantum Electron.

106

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Optical communication is an integral part of the modern economy, having all but replaced electronic communication systems. Future growth in bandwidth appears to be on the horizon using structured light, encoding information into the spatial modes of light, and transmitting them down fibre and free-space, the latter crucial for addressing last mile and digitally disconnected communities. Unfortunately, patterns of light are easily distorted, and in the case of free-space optical communication, turbulence is a significant barrier. Here we review recent progress in structured light in turbulence, first with a tutorial style summary of the core concepts, before highlighting the present state-of-the-art in the field. We support our review with new experimental studies that reveal which types of structured light are best in turbulence, the behaviour of vector versus scalar light in turbulence, the trade-off of diversity and multiplexing, and how turbulence models can be exploited for enhanced optical signal processing protocols. This comprehensive treatise will be invaluable to the large communities interested in free-space optical communication with spatial modes of light.

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mentioning

confidence: 99%

Structured Light in Turbulence

Cox

Mphuthi

Nape

et al. 2021

IEEE J. Select. Topics Quantum Electron.

106

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“…The crosstalk fading h pq was demonstrated in [30] to obey a Johnson S B distribution. However, the latter distribution is analytically intractable which makes theoretical derivations not feasible.…”

Section: System Modelmentioning

confidence: 99%

OAM Mode Selection and Space–Time Coding for Atmospheric Turbulence Mitigation in FSO Communication

et al. 2019

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Orbital angular momentum (OAM) multiplexing has recently received considerable interest in free space optical (FSO) communications. Propagating OAM modes through free space may be subject to atmospheric turbulence (AT) distortions that cause intermodal crosstalk and power disparities between OAM modes. In this paper, we are interested in multiple-input-multiple-output (MIMO) coherent FSO communication systems using the OAM. We propose a selection criterion for the OAM modes to minimize the impact of the AT. To further improve the obtained performance, we propose a space-time (ST) coding scheme at the transmitter. Through numerical simulations of the error probability, we show that the penalty from AT is completely absorbed for the weak AT regime, and considerable coding gains are obtained in the strong AT regime. INDEX TERMS Orbital angular momentum (OAM), atmospheric turbulence, mode selection, space-time coding.

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“…For all the previous models, closed-form expressions for performance metrics such as the average capacity, the outage probability, and the bit-error rate (BER) were derived. In OAM FSO systems, to the best of our knowledge, the only proposed statistical channel models for turbulence-induced fading were given in [18], [19].…”

Section: Introductionmentioning

confidence: 99%

A Unified Statistical Model for Atmospheric Turbulence-Induced Fading in Orbital Angular Momentum Multiplexed FSO Systems

Amhoud

Ooi

Alouini

2020

IEEE Trans. Wireless Commun.

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This paper proposes a unified statistical channel model to characterize the atmospheric turbulence induced distortions faced by orbital angular momentum (OAM) in free space optical (FSO) communication systems. In this channel model, the self-channel irradiance of OAM modes as well as crosstalk irradiances between different OAM modes are characterized by a Generalized Gamma distribution (GGD). The latter distribution is shown to provide an excellent match with simulated data for all regimes of atmospheric turbulence. Therefore, it can be used to overcome the computationally complex numerical simulations to model the propagation of OAM modes through atmospheric turbulent FSO channels. The GGD allows obtaining very simple tractable closed-form expressions for a variety of performance metrics. Indeed, the average capacity, the bit-error rate, and the outage probability are

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Orbital-angular-momentum crosstalk and temporal fading in a terrestrial laser link using single-mode fiber coupling

Cited by 33 publications

References 18 publications

Structured Light in Turbulence

Structured Light in Turbulence

OAM Mode Selection and Space–Time Coding for Atmospheric Turbulence Mitigation in FSO Communication

A Unified Statistical Model for Atmospheric Turbulence-Induced Fading in Orbital Angular Momentum Multiplexed FSO Systems

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