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Proceedings Paper

Free-space laser communication using a partially coherent laser source
Author(s): Jennifer C. Ricklin; Frederic M. Davidson; Thomas Weyrauch
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Paper Abstract

Atmospheric turbulence degrades the performance of laser communication systems in that system bit error rates can be orders of magnitude larger than in the absence of turbulence. Using a partially coherent laser beam may reduce system bit error rates due to irradiance scintillations in the receiver focal plane. In order to better understand the propagation of a partially coherent beam in atmospheric turbulence, we derive an analytic expression for the cross- spectral density of a partially coherent lowest-order Gaussian laser beam (TEM00) in turbulence. From the second moment equation expressions for the average intensity, beam size, radius of curvature and lateral coherence length are derived. These results are valid for any beam type: focused, collimated, divergent, and the limiting cases of the plane and spherical wave. We also present preliminary experimental results that indicate a reduction in bit error rates would occur if a partially coherent beam were used.

Paper Details

Date Published: 29 January 2002
PDF: 11 pages
Proc. SPIE 4538, Optics in Atmospheric Propagation and Adaptive Systems IV, (29 January 2002); doi: 10.1117/12.454413
Show Author Affiliations
Jennifer C. Ricklin, Army Research Lab. (United States)
Frederic M. Davidson, Johns Hopkins Univ. (United States)
Thomas Weyrauch, Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 4538:
Optics in Atmospheric Propagation and Adaptive Systems IV
Anton Kohnle; John D. Gonglewski; Thomas J. Schmugge, Editor(s)

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