Raised cosine/NRZ line coding techniques for upgrading free space optical communication systems through various levels of fog

Aadel M. Alatwi, Ahmed Nabih Zaki Rashed

Abstract


This study examines raised cosine/NRZ line coding techniques for upgrading free space optical (FSO) communication systems through various levels of fog.The max. Q factors are simulated and estimated for clear air, light fog, and moderate fog weather conditions at a data rate of 20 Gb/s. The optical signal to noise ratio is also measured for different weather conditions. The total power after both FSO channel and avalanche photodiode (APD) photo-detector receiver is estimated by an optical power meter for max. distances.The study shows that the max. propagation distance is extended to 50 kmthrough clear air, 2.25 km through light fog, and 1.6 km through moderate fog with acceptable max. Q factor


Keywords


bit stream sequence; Fog weather; FSO channel; NRZ/RZ coding; optical amplifiers;

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DOI: http://doi.org/10.12928/telkomnika.v18i6.16236

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TELKOMNIKA Telecommunication, Computing, Electronics and Control
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