Experimental analysis of orbital angular momentum-carrying beams in turbulence

Jaime A. Anguita; Joaquín Herreros

doi:10.1117/12.892955

Experimental analysis of orbital angular momentum-carrying beams in turbulence

Jaime A. Anguita, Joaquín Herreros

Research output: Contribution to conference › Paper

5 Scopus citations

Abstract

In a laboratory experiment we generate, propagate, and detect laser vortex beams carrying orbital angular momentum (OAM) by means of spatial light modulators (SLMs). We show that beams with OAM states from - 20 to +20 can be effectively generated using different types of phase gratings, and that excellent contrast between adjacent OAM modes is achieved. A weak turbulent air flow is induced on the propagation path to emulate the effects of atmospheric turbulence. By characterizing the effects of optical turbulence on the modal crosstalk among received OAM states we show that it is possible to distinguish them for the purpose of increasing the data throughput of a laser communication link in weak turbulence. It is also demonstrated that by increasing the complexity of the receiver, optical separation of the OAM modes is possible at stronger turbulence conditions.

Original language	American English
DOIs	https://doi.org/10.1117/12.892955
State	Published - 17 Oct 2011
Event	Proceedings of SPIE - The International Society for Optical Engineering - Duration: 1 Jan 2019 → …

Conference

Conference	Proceedings of SPIE - The International Society for Optical Engineering
Period	1/01/19 → …

Keywords

Channel interference
Channel multiplexing
Free-space laser communication
Optical vortices
Orbital angular momentum

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abstract = "In a laboratory experiment we generate, propagate, and detect laser vortex beams carrying orbital angular momentum (OAM) by means of spatial light modulators (SLMs). We show that beams with OAM states from - 20 to +20 can be effectively generated using different types of phase gratings, and that excellent contrast between adjacent OAM modes is achieved. A weak turbulent air flow is induced on the propagation path to emulate the effects of atmospheric turbulence. By characterizing the effects of optical turbulence on the modal crosstalk among received OAM states we show that it is possible to distinguish them for the purpose of increasing the data throughput of a laser communication link in weak turbulence. It is also demonstrated that by increasing the complexity of the receiver, optical separation of the OAM modes is possible at stronger turbulence conditions.",

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