ATMOSPHERIC CHANNEL EFFECTS ONTERRESTRIAL FREE SPACE OPTICALCOMMUNICATION LINKS
Abstract.
This paper illustrates the challenges imposed by the
atmospheric channel on the design of a terrestrial laser communication link.
The power loss due to scattering effect is described using the Kim/Kruse
scattering model while the effect and the penalty imposed by atmospheric
turbulence is highlighted by considering the bit error rate (BER) of an On-
Off Keying modulated link in an optical Poisson channel. The power loss due
to thick fog can measure over 100 dB/km while snow and rain result in much
lower attenuation. We show that non-uniformity in the atmospheric
temperature also contributes to performance deterioration due to
scintillation effect. At a BER of 10-4, for a channel with a turbulence strength
of >0.1, the penalty imposed by turbulence induced fading is over 20
photoelectron counts in order to achieve the same level of performance as a
channel with no fading. The work reported here is part of the EU COST
actions and EU projects
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