Fog and rain attenuation characterization and performance of terrestrial free space optical communication in Akure, Nigeria

  • Ajewole M. O Federal University of Technology
  • Owolawi P. A Federal University of Technology
  • Ojo J. S Federal University of Technology
  • Adetunji R. M. Federal University of Technology
Keywords: free space optics (FSO), fog and visibility, rain, specific attenuation, probability, link margin


Reliable broadband communication requires secure high data rate and bandwidth links. With the observed
increase in broadband users, known communication systems such as RF and microwave links cannot promise such
requirements due to link interference and low bandwidth. A current communication system that promises such
requirements and more is Free Space Optical (FSO) communication. This system basically involves the transmission
of signal-modulated optical radiation from a transmitter to a receiver through the atmosphere or outer space. However,
location-variant atmospheric channel degrades the performance of an FSO system under severe atmospheric
conditions, thus necessitating local atmospheric attenuation studies.
This paper presents the characterization of both fog- and rain-induced attenuation and the performance of
an FSO system in a terrestrial terrain at Akure, Nigeria. One-year archived visibility data and in-situ measured 1-
minute integration time rain rate data obtained from Nigerian Meteorological Agency (NIMET) and the Department
of Physics, Federal University of Technology, Akure were used to compute the fog- and rain-induced specific
attenuations using Kruse model and Carboneur model respectively. The performance of the FSO system is analyzed
through link margin by using the parameters of a commercial optical transceiver, Terescope 5000.


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