Comparing mode-crosstalk and mode-dependent loss of laterally displaced orbital angular momentum and Hermite–Gaussian modes for free-space optical communication

Ndagano, B. , Mphuthi, N., Milione, G. and Forbes, A. (2017) Comparing mode-crosstalk and mode-dependent loss of laterally displaced orbital angular momentum and Hermite–Gaussian modes for free-space optical communication. Optics Letters, 42(20), pp. 4175-4178. (doi: 10.1364/OL.42.004175)

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Abstract

There is interest in using orbital angular momentum (OAM) modes to increase the data speed of free-space optical communication. A prevalent challenge is the mitigation of mode-crosstalk and mode-dependent loss that is caused by the modes’ lateral displacement at the data receiver. Here, the mode-crosstalk and mode-dependent loss of laterally displaced OAM modes (LG0,+1, LG0,−1) are experimentally compared to that of a Hermite–Gaussian (HG) mode subset (HG0,1, HG1,0). It is shown, for an aperture larger than the modes’ waist sizes, some of the HG modes can experience less mode-crosstalk and mode-dependent loss when laterally displaced along a symmetry axis. It is also shown, over a normal distribution of lateral displacements whose standard deviation is 2× the modes’ waist sizes, on average, the HG modes experience 66% less mode-crosstalk and 17% less mode-dependent loss.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ndagano, Mr Bienvenu
Authors: Ndagano, B., Mphuthi, N., Milione, G., and Forbes, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Letters
Publisher:Optical Society of America
ISSN:0146-9592
ISSN (Online):1539-4794
Published Online:22 September 2017

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