Higher-Order Spatial Modes in Turbulence: Alternatives to Orbital Angular Momentum

Abstract
The effect of atmospheric turbulence on Orbital Angular Momentum (OAM) modes, which are a subset of the Laguerre-Gaussian (LG) modes, has been thoroughly studied. Other high-order basis sets such as Hermite-Gaussian (HG, which have a rectangular shape) and Ince-Gaussian modes (which have an elliptical shape) have received relatively little attention. In this work, comparative experimental measurements of low order OAM, Ince-, and Hermite-Gaussian modes in turbulence are presented. It is found that the performance of the mode sets vary dramatically in the same turbulence. Surprisingly, Ince-Gaussian modes experience lower crosstalk and mode dependent loss than LG and HG modes of similar order. This warrants further investigation: could there be an optimal basis set for optical communications in turbulence?

Citation
Cox, M. A., Trichili, A., Ooi, B. S., & Alouini, M.-S. (2021). Higher-Order Spatial Modes in Turbulence: Alternatives to Orbital Angular Momentum. 2021 IEEE International Conference on Communications Workshops (ICC Workshops). doi:10.1109/iccworkshops50388.2021.9473576

Publisher
IEEE

Conference/Event Name
2021 IEEE International Conference on Communications Workshops, ICC Workshops 2021

DOI
10.1109/ICCWorkshops50388.2021.9473576

Additional Links
https://ieeexplore.ieee.org/document/9473576/

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