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Proceedings Paper

Toward optimizing partial spatially coherent beams for free space laser communications
Author(s): Xifeng Xiao; David Voelz
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Paper Abstract

A performance metric is proposed as a general measure for optimizing the transverse coherence length lc of a partial spatially coherent beam for a given communication scenario. The expression is essentially the mean intensity minus the standard deviation of the intensity and we seek to maximize this quantity. It is preliminarily verified by the probability of fade with log-normal distribution model under the weak turbulence condition. We also examine it as a function of lc using wave optics simulations and compared these results with the relationships predicted by analytic theory under weak to medium-strong turbulence conditions. Our results verify there exists a unique coherence length that can optimize the receiver beam quality. After calculating the probability of fades of the optimal partially coherent beam and the fully coherent beam and comparing them with the wave optics simulation results, good agreement was observed.

Paper Details

Date Published: 25 September 2007
PDF: 8 pages
Proc. SPIE 6709, Free-Space Laser Communications VII, 67090P (25 September 2007); doi: 10.1117/12.735634
Show Author Affiliations
Xifeng Xiao, New Mexico State Univ. (United States)
David Voelz, New Mexico State Univ. (United States)

Published in SPIE Proceedings Vol. 6709:
Free-Space Laser Communications VII
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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