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Proceedings Paper

Free-space communication with spatial modes of light
Author(s): Lucas Gailele; Angela Dudley; Andrew Forbes
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Paper Abstract

Current communication systems make use of polarization and wavelength multiplexing to increase transmission rates. To offer a further improvement, Orbital Angular Momentum (OAM) modes (or Laguerre-Gaussian modes) provide an infinite dimensional space. In this work, Laguerre-Gaussian modes are multiplexed and de-multiplexed by means of two Spatial Light Modulators (SLMs), making use of both their azimuthal and radial degrees of freedom. Due to the orthogonality of these modes, a modal decomposition technique is employed to detect the transmitted modes. Here we demonstrate this concept by transmitting an image over a 150 meter free-space link. The free-space link is also characterized in terms of its optical turbulence.

Paper Details

Date Published: 14 September 2018
PDF: 6 pages
Proc. SPIE 10744, Laser Beam Shaping XVIII, 1074414 (14 September 2018); doi: 10.1117/12.2505725
Show Author Affiliations
Lucas Gailele, CSIR National Laser Ctr. (South Africa)
Univ. of Witwatersrand (South Africa)
Angela Dudley, CSIR National Laser Ctr. (South Africa)
Univ. of Witwatersrand (South Africa)
Andrew Forbes, Univ. of Witwatersrand (South Africa)

Published in SPIE Proceedings Vol. 10744:
Laser Beam Shaping XVIII
Angela Dudley; Alexander V. Laskin, Editor(s)

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