Scintillation of pseudo-partially coherent Gaussian beam in atmospheric turbulence: application for free-space optical communications

Xianmei Qian; Wenyue Zhu; Ruizhong Rao

doi:10.1117/12.974345

1 November 2012 Scintillation of pseudo-partially coherent Gaussian beam in atmospheric turbulence: application for free-space optical communications

Xianmei Qian, Wenyue Zhu, Ruizhong Rao

Author Affiliations +

Proceedings Volume 8535, Optics in Atmospheric Propagation and Adaptive Systems XV; 85350H (2012) https://doi.org/10.1117/12.974345
Event: SPIE Remote Sensing, 2012, Edinburgh, United Kingdom

Abstract

By using wave optics numerical simulation, the scintillation of pseudo-partially coherent Gaussian beam propagating in atmospheric turbulence is investigated. The effects of partial coherence on scintillation index are analyzed as a function of the correlation length of beam source. The reduction of the aperture averaging scintillation index, on-axis and off-axis scintillation are shown for a horizontal propagation path. The aperture averaging factor of pseudo-partially coherent beam is compared with that of fully-coherent beam. And how the pseudo-partially coherent Gaussian beam behaves like partially coherent Gaussian Schell-model beam is also discussed. It was found that the on-axis scintillation index and off-axis scintillation index of pseudo-partially coherent beam can be reduced greatly by decreasing the coherence degree of beam source. The results of aperture averaging scintillation index also revealed the advantage of using pseudo-partially coherent beam compared to fully coherent beam. However, the aperture averaging factor of a pseudo-partially coherent beam is smaller than that of the fully coherent beam at the same receiving aperture diameter. This implies that the aperture averaging effect of scintillation index may be weakened by reducing the coherence degree of beam source. This work may provide a basis for the utilization of pseudo-partially coherent beam in free-space optical communications.

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Xianmei Qian, Wenyue Zhu, and Ruizhong Rao "Scintillation of pseudo-partially coherent Gaussian beam in atmospheric turbulence: application for free-space optical communications", Proc. SPIE 8535, Optics in Atmospheric Propagation and Adaptive Systems XV, 85350H (1 November 2012); https://doi.org/10.1117/12.974345

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KEYWORDS

Scintillation

Atmospheric propagation

Atmospheric turbulence

Free space optical communications

Atmospheric optics

Diffusers

Phase shift keying

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