Raised Cosine/NRZ Line Coding Techniques for Upgrading FSO Communication Systems through Various Levels of Fog

Aadel M. Alatwi, Ahmed Nabih Zaki Rashed


This study examines raised cosine/NRZ line coding techniques for upgrading 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 APD photodetector receiver is estimated by an optical power meter for max. distances. The study shows that the max. propagation distance is extended to 50 km through clear air, 2.25 km through light fog, and 1.6 km through moderate fog with acceptable max. Q factor.


FSO channel; NRZ/RZ Coding; Optical amplifiers; Bit stream sequence; Fog weather;

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

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TELKOMNIKA Telecommunication, Computing, Electronics and Control
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