Radiative effects of atmospheric aerosols on the average channel capacity of free-space optical communication systems

Sunilkumar, K and Anand, N and Satheesh, SK and Moorthy, KK and Ilavazhagan, G (2021) Radiative effects of atmospheric aerosols on the average channel capacity of free-space optical communication systems. In: Applied Optics, 60 (31). pp. 9957-9965.

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Abstract

Free-space optical (FSO) communication systems employ unguided light beams propagating through the atmosphere to carry a large volume of data. The reliability of such data transfer can be hampered by various atmospheric effects. Based on an analytical model of a differential phase-shift keying FSO system through exponentiated Weibull turbulence, we investigate the effectiveness of beam width optimization and improved beam alignment, along with aperture averaging on the average channel capacity. Our results show significant signal deterioration produced due to the aerosol-induced optical turbulence, which substantially shadows the performance gain achieved through beam width optimization. Strong aerosol-induced atmospheric heating and the consequent enhanced optical scintillations result in reduction of the channel capacity by as much as 50 of its value when these effects are not considered or negligible. FSO systems are more resilient to aerosol-induced optical turbulence when the normalized beam width is less, and the average channel capacity can be significantly improved by improved beam alignment. These variations are weakly dependent under poor transmitter�receiver alignment conditions. Furthermore, the receiver aperture has a strong control on the link performance. While FSO systems with higher magnitude of normalized beam width have improved performance under all aperture diameter conditions; for a given beam configuration, large aperture diameter ensures a significant improvement in the link performance due to reduction in effects of scintillations. © 2021 Optical Society of America

Item Type:	Journal Article
Publication:	Applied Optics
Publisher:	The Optical Society
Additional Information:	The copyright for this article belongs to The Optical Society
Keywords:	Alignment; Atmospheric thermodynamics; Atmospheric turbulence; Channel capacity; Data transfer; Deterioration; Optical communication, reductions; Average channel capacities; Beam alignments; Beam widths; Condition; Free space optical communication systems; Free space optical systems; Free-space optical communications systems; Optical turbulence; Optimisations, Scintillation
Department/Centre:	Division of Mechanical Sciences > Divecha Centre for Climate Change Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	18 Nov 2021 11:33
Last Modified:	18 Nov 2021 11:33
URI:	http://eprints.iisc.ac.in/id/eprint/70545

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