Atmospheric and Ocean Optics

Metric for optimizing spatially partially coherent beams for propagation through turbulence

[+] Author Affiliations
David G. Voelz

New Mexico State University, Klipsch School of Electrical and Computer Engineering, Las Cruces, New Mexico 88003

Xifeng Xiao

New Mexico State University, Klipsch School of Electrical and Computer Engineering, Las Cruces, New Mexico 88003

Opt. Eng. 48(3), 036001 (March 19, 2009). doi:10.1117/1.3090435
History: Received June 18, 2008; Revised January 15, 2009; Accepted January 18, 2009; Published March 19, 2009
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A performance metric Δ is described that can be used to determine the parameters of a partially coherent beam for near-optimal performance of a free-space optical link. The metric is defined as the mean received irradiance minus the standard deviation of the irradiance, and maximizing Δ balances the effects of beam spread and scintillation. An analytic form of Δ is developed for a Gaussian Schell-model beam, where the optimization parameter is the transverse coherence length. Comparisons of the metric performance are made with the more conventional probability-of-fade metric. The metric Δ is applied to determine the characteristics of the optimized coherence length as a function of a variety of link parameters and scenarios. In general, the optimized coherence length tends to decrease with increasing turbulence strength and propagation distance but increases with wavelength, although the behavior of specific scenarios can vary.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

David G. Voelz and Xifeng Xiao
"Metric for optimizing spatially partially coherent beams for propagation through turbulence", Opt. Eng. 48(3), 036001 (March 19, 2009). ; http://dx.doi.org/10.1117/1.3090435


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