Abstract
The field of Free Space Optical (FSO) communications has to deal with several challenges, which have to be considered. One of the most serious amongst them is fog attenuation. In this paper, an effective method for investigation of a long-distant FSO system's performance in the presence of fog is described. The proposed hardware channel emulator for laboratory measurements is based on a controllable optical attenuator, providing uncomplicated experimental environment in terms of fog conditions. An overview of already accomplished fog measurement campaigns is given as well as a rough summary of the self-developed MATLAB channel models. The findings were incorporated into the custom-made voltage driver (attenuator control unit), which controls the optical attenuator and represent sufficient basis for further laboratory long-distance FSO link verifications.
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