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Proceedings Paper

Estimation of Mie scattering influence for the FSO channel under artificially simulated fog conditions
Author(s): Hristo Ivanov; Thomas Plank; Luka Mustafa; Eva Cerncic; Erich Leitgeb
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Paper Abstract

Free Space Optical (FSO) systems offer tremendous channel capacity, which can significantly contribute to the bandwidthhungry next generation networks. FSO technology is certainly highly vulnerable to atmospheric Mie scattering, which leads to severe degradation of the established optical communication link. To address this key-issue, the current paper is focused on detailed investigation of the fog effect using artificially built fog environment. Low-visibility conditions are adjusted within a 50 m long corridor covered with PVC and including two artificial fog machines and a signal flare. The Particle Size Distributions (PSDs) of the simulated fog are measured with a sophisticated and so-called “Spraytec” device provided by Malvern Instruments Company. Once the main characteristics of the artificial fog are assessed, the measurements are compared with an empirical estimated fog model using modified gamma function. The comparison is accomplished in terms of theoretically defined PSDs where both radiation as well as advection fog modelling are taken into account. In order to calculate the relevant FSO channel attenuation only based on our measured fog PSDs, Mie theory is applied. For this purpose, Mie scattering efficiencies of a fog water sphere with arbitrary radius and refractive index are shown and examined. Respectively, apart from the presented figures with comparison of various PSDs, also the specific attenuation in dependence on fog particles size is introduced and discussed. Taking into account that particle density of the artificial fog can be manually setup in accordance with the applied theoretical models, our simulations offer attenuation up to 210 dB/km in the presence of continental moderate and dense fog effects. Consequently, we have the possibility to simulate significantly well various fog conditions in artificially simulated environment.

Paper Details

Date Published: 10 October 2018
PDF: 9 pages
Proc. SPIE 10787, Environmental Effects on Light Propagation and Adaptive Systems, 107870R (10 October 2018); doi: 10.1117/12.2325482
Show Author Affiliations
Hristo Ivanov, Technische Univ. Graz (Austria)
Thomas Plank, Technische Univ. Graz (Austria)
Luka Mustafa, Univ. College London (United Kingdom)
Eva Cerncic, Institute IRNAS Race (Slovenia)
Erich Leitgeb, Technische Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 10787:
Environmental Effects on Light Propagation and Adaptive Systems
Karin U. Stein; Szymon Gladysz, Editor(s)

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