Abstract
This paper considers Free Space Optics (FSO) systems. FSO availability and reliability is taken under the scope. FSO links operate within the infrared wavelength region. Lasers are used as light sources between two nodes to carry informational stream. FSO systems use Line of Sight (LOS) technology in order to maintain connection between two points. Weather conditions have quite significant impact on FSO operation in terms of availability and reliability. It is necessary to evaluate the air quality at the actual geographical location where FSO link is supposed to be placed. It is important to determine the impact of a light scattering, absorption, turbulence as well as a receiving power when dealing with FSO systems. Visibility has one of the most critical impacts on the quality of an optical transmission channel. Moreover, it is essential to monitor and store information about rain, snow and fog conditions. This paper introduces a device which measures all mentioned weather indicators such as a fog density, a relative humidity and a temperature. FSO availability and reliability estimation is based on measured data. These results evaluate weather conditions for Kosice (a campuse of Technical University of Kosice) in terms of FSO operation.
Highlights
Free Space Optics (FSO) is license free worldwide technology which offers full duplex connectivity between two points
Fog consists of water droplets with 100 nm in diameter, which corresponds with using wavelengths in FSO systems [3]
For the calculation we use the empirical formula for fog visibility as a function of fog density: Fig. 6 Localization of FSO link in Technical University of Košice (TUKE) campus
Summary
FSO is license free worldwide technology which offers full duplex connectivity between two points It is called Free Space Optics (FSO) communication and it can be installed in less than one day. FSO system heavily depends on weather conditions because of constantly changing atmosphere behaviour Atmospheric phenomena such as scattering, absorption, turbulences, diffraction and attenuations make losses which decreasing receiving power. Fog consists of water droplets with 100 nm in diameter, which corresponds with using wavelengths in FSO systems [3]. It causes scattering and attenuation which have negative effects on infrared optical laser beam. Rain is formed from the water vapour contained in the atmosphere.
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