16 October 2006 Fade statistics for Gaussian beam waves in moderate-to-strong turbulence
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Abstract
The performance of lasercom systems operating in the atmosphere is reduced by optical turbulence, which causes irradiance fluctuations in the received signal. The result is a randomly fading signal. In this work, fade statistics obtained from experimental data were compared to theoretical predictions based on the lognormal and gamma-gamma distributions. The probability of fade and expected number of fades per second were calculated from the irradiance fluctuations of a Gaussian beam wave propagating through the atmosphere on a horizontal path, near ground, in the moderate-to-strong turbulence regime. Irradiance data was collected simultaneously at three receiving apertures of different size. Atmospheric parameters were inferred from the measurements and used to calculate the parameters for the theoretical distributions. A new integral expression for the expected number of fades based on the gamma-gamma distribution was developed and shown to make a significant difference compared to the existing approximation.
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Frida Strömqvist Vetelino, Frida Strömqvist Vetelino, Cynthia Young, Cynthia Young, Larry Andrews, Larry Andrews, } "Fade statistics for Gaussian beam waves in moderate-to-strong turbulence", Proc. SPIE 6399, Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays, 639907 (16 October 2006); doi: 10.1117/12.693037; https://doi.org/10.1117/12.693037
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