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Radiative effects of atmospheric aerosols on optical pulse propagation: Implications to high data rate Free Space Optical (FSO) communication systems

Sunilkumar, K and Anand, N and Satheesh, SK and Krishna Moorthy, K and Ilavazhagan, G (2019) Radiative effects of atmospheric aerosols on optical pulse propagation: Implications to high data rate Free Space Optical (FSO) communication systems. In: Laser Communication and Propagation through the Atmosphere and Oceans VIII 2019, 13 - 15 August 2019, San Diego.

Full text not available from this repository.
Official URL: https://doi.org/10.1117/12.2528645


Free space optical (FSO) communication is a line of sight technology capable of carrying large volume of data using laser signals through the atmosphere. This unguided propagation of laser beams through the atmosphere confronts with turbulent fluctuations and suspended aerosol particles on its en route to the receiver. Random fluctuations in the atmospheric refractive index causes variations in the propagation constant and thereby affects the optical pulse propagation. We examine the local atmospheric warming effects of absorbing aerosols on the atmospheric refractive index fluctuation statistics and its influence on the group velocity dispersion (GVD) parameter. Black Carbon (BC) aerosols increase local temperature through solar absorption, which will be amplified when they reside in the upper atmosphere for longer duration, owing to the reduced atmospheric density prevailing at higher altitudes. To elucidate the implications of elevated BC layer heating on FSO links, vertical BC mass concentration was measured using an Aethalometer (Model AE-42, of Magee Scientific, USA) mounted on a hydrogen filled balloon. Long term analysis of multi-satellite observations along with in-situ measurements of aerosol parameters show dependence of GVD on aerosol induced local atmospheric warming. Effect of warming on outage probability of FSO systems employing chirped Gaussian pulses are also presented.

Item Type: Conference Paper
Publication: Proceedings of SPIE - The International Society for Optical Engineering
Publisher: SPIE
Additional Information: The copyright for this article belongs to The Society of Photo-Optical Instrumentation Engineers (SPIE).
Keywords: Atmospheric aerosols; Atmospheric optics; Atmospheric thermodynamics; Data communication systems; Group velocity dispersion; Laser beams; Light velocity; Optical communication; Refractive index; Upper atmosphere, Atmospheric refractive index; Chirped Gaussian pulse; Free Space Optical communication; Free space optical communication systems; Multi-satellite observations; Optical pulse propagation; Propagation of laser beams; Turbulent fluctuation, Light propagation
Department/Centre: Division of Mechanical Sciences > Divecha Centre for Climate Change
Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 05 Dec 2022 06:07
Last Modified: 05 Dec 2022 06:07
URI: https://eprints.iisc.ac.in/id/eprint/78212

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