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Proceedings Paper

Real-time hardware background subtraction using an adjustable gain balance amplified photodetector
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Paper Abstract

The growth of optical communication has created a need to correctly characterize the atmospheric channel. The measurement of turbulence, due to its ability to drastically effect signal quality, is an important part of this characterization and can be partially accomplished via calculation of the scintillation index. However, proper calculation of the scintillation index requires that the background (specifically the diffuse solar background) be accurately subtracted from the transmitted signal. While there are many methods to remove this background we introduce a hardware based method which seeks to overcome the weaknesses of traditional approaches while adding its own strengths. The corrected signal is allowed a greater dynamic range and atmospheric background variations are accounted for during transmission. We begin by discussing the scintillation index and traditional means of background subtraction followed with an introduction of our proposed optical design. We provide details of the experimental setup, data collection over a maritime location in San Diego, and analysis. Finally, we compare scintillation index calculations using our new method and a traditional method of background subtraction. Our results ranked our method favorably alongside common methods of background subtraction.

Paper Details

Date Published: 7 October 2014
PDF: 8 pages
Proc. SPIE 9224, Laser Communication and Propagation through the Atmosphere and Oceans III, 922410 (7 October 2014); doi: 10.1117/12.2063330
Show Author Affiliations
Galen D. Cauble, Space and Naval Warfare Systems Ctr. Pacific (United States)
David T. Wayne, Space and Naval Warfare Systems Ctr. Pacific (United States)

Published in SPIE Proceedings Vol. 9224:
Laser Communication and Propagation through the Atmosphere and Oceans III
Alexander M. J. van Eijk; Christopher C. Davis; Stephen M. Hammel, Editor(s)

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