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Proceedings Paper

Point-to-point wireless communication using partially coherent optical fields
Author(s): Jennifer C. Ricklin; Frederic M. Davidson
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Paper Abstract

Coherent light launched into an atmospheric channel experiences substantial degradation in spatial coherence as it traverses the channel, resulting in beam wander and intensity scintillation at the receiver. Launching partially coherent light with well-defined 'beam-like' properties into the channel may exploit the spatial and frequency diversity properties of the atmospheric path so that acceptably low levels of system bit error rate performance can be obtained at fiber-optic data rates. To better understand the properties of partially coherent light in an atmospheric channel, here we develop an analytic expression for the second moment of a partially coherent lowest-order Gaussian beam propagating in the presence of isotropic, homogenous atmospheric turbulence. From the second moment equation expressions for the average intensity, beam size, complex degree of coherence, 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. Expressions obtained here exactly reduce to the diffractive equivalents for a fully coherent beam when full coherence and the absence of turbulence are assumed. In addition, results correspond to expressions obtained previously for a partially coherent collimated beam in the absence of turbulence.

Paper Details

Date Published: 22 January 2002
PDF: 10 pages
Proc. SPIE 4489, Free-Space Laser Communication and Laser Imaging, (22 January 2002); doi: 10.1117/12.453224
Show Author Affiliations
Jennifer C. Ricklin, Army Research Lab. (United States)
Frederic M. Davidson, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 4489:
Free-Space Laser Communication and Laser Imaging
David G. Voelz; Jennifer C. Ricklin, Editor(s)

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