6533b82bfe1ef96bd128e767

RESEARCH PRODUCT

Contribution à l'étude des liaisons optiques atmosphériques : propagation, disponibilité et fiabilité.

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In this work we study the fog attenuation in the visible and infrared spectral band related to Free Space Optics (FSO). Based on the Mie scattering theory, fog extinction coefficients for different particle size distributions as a function of wavelength were derived. A simple analytical model allowing the prediction of atmospheric transmission for the 0.69 - 1.55 µm spectral band was developed. This model is valid for advection and convection fog and for visibility range between 50 to 1000 m. This model, implemented into software developed at FT R&D, allows the prediction of the Quality of Service of FSO links. Finally, we performed an experimental study to compare the fog effect on two FSO links operating at 650, 850 and 950 nm in the same propagation channel and meteorological conditions. This allows us to valid our transmission model and to prove that it permits a better prediction for the fog attenuation in comparison with others FSO models available in the literature.