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Prediction of Drop Size Distribution Parameters for Optical Wireless Communications Through Moderate Continental Fog

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Executive Summary

Wireless Optical Communication Links (OCL), or Free Space Optics (FSO) links involving Optical Ground Stations (OGS) are highly influenced by the earth atmosphere due to the interaction of the optical wave with particles of different size and shape. Fog, clouds, rain and snow cause significant signal attenuation thus limiting the performance of OCL. In this paper, the authors consider the behavior of OCL in the troposphere under moderate continental fog conditions, which are important for both ground-ground and ground-space OCL. The impact of the Droplet Size Distribution (DSD) of fog is investigated, by processing laser attenuation measurements carried out in Milan (Italy) and Graz (Austria).

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