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International Journal of Optics
Volume 2016 (2016), Article ID 8730609, 8 pages
http://dx.doi.org/10.1155/2016/8730609
Research Article

Irradiance Scintillation Index for a Gaussian Beam Based on the Generalized Modified Atmospheric Spectrum with Aperture Averaged

1School of Astronautics and Aeronautic, University of Electronic Science and Technology of China, 2006 Xiyuan Avenue, Chengdu 611731, China
2School of Accounting, Southwestern University of Finance and Economics, 555 Liutai Avenue, Chengdu 611130, China

Received 18 August 2015; Revised 5 January 2016; Accepted 21 January 2016

Academic Editor: Fortunato Tito Arecchi

Copyright © 2016 Chao Gao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper investigates the aperture-averaged irradiance scintillation index of a Gaussian beam propagating through a horizontal path in weak non-Kolmogorov turbulence. Mathematical expressions are obtained based on the generalized modified atmospheric spectrum, which includes the spectral power law value of non-Kolmogorov turbulence, the finite inner and outer scales of turbulence, and other optical parameters of the Gaussian beam. The numerical results are conducted to analyze the influences of optical parameters on the aperture-averaged irradiance scintillation index for different Gaussian beams. This paper also examines the effects of the irradiance scintillation on the performance of the point-to-point optical wireless communication system with intensity modulation/direct detection scheme.