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Optical Engineering

Free-space optical wavelength diversity scheme for fog mitigation in a ground-to-unmanned-aerial-vehicle communications link
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Paper Abstract

Atmospheric weather conditions adversely affect the performance of free-space optical communications systems. Fog present in the atmosphere has the largest impact on free-space optical systems. We use simulation techniques to investigate the performance of a slant-path, wavelength-diversified free-space optical link between a ground station and an unmanned aerial vehicle in the presence of radiation fog. The free-space optical link is configured to operate using the simultaneous transmission of three wavelengths, 0.85, 1.55, and 10 µm, connecting a ground station to an unmanned aerial vehicle operating at either a 4- or 8-km altitude. The link is further analyzed by combining the multiple carrier wavelengths into either an equal-gain diversity scheme or a selective diversity scheme. The simulation results are obtained using ALTM and PcModWin simulation software from Ontar Corporation. The results obtained demonstrate that the use of either an equal-gain diversity scheme or a selective diversity scheme enables the deployment of a ground-to-air free-space optical communications link. Furthermore, a selective diversity scheme demonstrates a received power approximately three times greater than an equal-gain diversity scheme.

Paper Details

Date Published: 1 August 2006
PDF: 12 pages
Opt. Eng. 45(8) 086001 doi: 10.1117/1.2338565
Published in: Optical Engineering Volume 45, Issue 8
Show Author Affiliations
Alan Harris, Univ. of North Florida (United States)
James J. Sluss, Univ. of Oklahoma (United States)
Hazem Hejjo Refai, Univ. of Oklahoma (United States)
Peter G. LoPresti, Univ. of Tulsa (United States)

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