Rosales-Guzmán, C., Trichili, A., Dudley, A., Ndagano, B. , Ben Salem, A., Zghal, M. and Forbes, A. (2016) Optical Communications Beyond Orbital Angular Momentum. In: Laser Beam Shaping XVII, San Diego, CA, USA, 28 Aug - 01 Sep 2016, 99500C. ISBN 9781510602915 (doi: 10.1117/12.2238416)
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Abstract
Current optical communication technologies are predicted to face a bandwidth capacity limit in the near future. The nature of the limitation is fundamental rather than technological and is set by nonlinearities in optical fibers. One solution, suggested over 30 years ago, comprises the use of spatial modes of light as information carriers. Along this direction, light beams endowed with orbital angular momentum (OAM) have been demonstrated as potential information carriers in both, free space and fibres. However, recent studies suggest that purely OAM modes does not increase the bandwidth of optical communication systems. In fact, in all work to date, only the azimuthal component of transverse spatial modes has been used. Crucially, all transverse spatial modes require two degrees of freedom to be described; in the context of Laguerre-Gaussian (LGp`) beams these are azimuthal (l) and radial (p), the former responsible for OAM. Here, we demonstrate a technique where both degrees of freedom of LG modes are used as information carrier over free space. We transfer images encoded using 100 spatial modes in three wavelengths as our basis, and employ a spatial demultiplexing scheme that detects all 100 modes simultaneously. Our scheme is a hybrid of MIMO and SMM, and serves as a proof-of-principle demonstration. The cross-talk between the modes is small and independent of whether OAM modes are used or not.
| Item Type: | Conference Proceedings |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Ndagano, Mr Bienvenu |
| Authors: | Rosales-Guzmán, C., Trichili, A., Dudley, A., Ndagano, B., Ben Salem, A., Zghal, M., and Forbes, A. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| ISSN: | 0277-786X |
| ISBN: | 9781510602915 |
| Published Online: | 27 September 2016 |
| Copyright Holders: | Copyright © 2016 SPIE |
| First Published: | First published in Proceedings of SPIE 9950: 99500C |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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