Abstract
This paper theoretically and experimentally investigate the spectrum attenuation
of free space optical (FSO) communication systems operating at visible and near infrared
(NIR) wavelengths (0.6 μm < λ < 1.6 μm) under fog and smoke
in a controlled laboratory condition. Fog and smoke are generated and controlled
homogeneously along a dedicated atmospheric chamber of length 5.5 m. A new wavelength
dependent empirical model is proposed to predict the fog and smoke attenuation operating
at visible and NIR wavelengths. Comparison of the new proposed model with the measured
continuous attenuation spectrum from visible—NIR in the fog and smoke channels shows a
close relationship than the semi-empirical Kim and Kruse fog models. The experimental
results also show the selection for the possible appropriate wavelengths from
visible—NIR for FSO links to achieve the maximum link span in dense fog
conditions.
© 2013 IEEE
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