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Opt Express. 2012 Jun 4;20(12):13195-200. doi: 10.1364/OE.20.013195.

Influence of atmospheric turbulence on optical communications using orbital angular momentum for encoding.

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  • 1The Institute of Optics, University of Rochester, Rochester, New York 14627, USA. memalik@optics.rochester.edu

Abstract

We describe an experimental implementation of a free-space 11-dimensional communication system using orbital angular momentum (OAM) modes. This system has a maximum measured OAM channel capacity of 2.12 bits/photon. The effects of Kolmogorov thin-phase turbulence on the OAM channel capacity are quantified. We find that increasing the turbulence leads to a degradation of the channel capacity. We are able to mitigate the effects of turbulence by increasing the spacing between detected OAM modes. This study has implications for high-dimensional quantum key distribution (QKD) systems. We describe the sort of QKD system that could be built using our current technology.

PMID:
22714347
[PubMed]
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