Authors

O. Korotkova; L. C. Andrews;R. L. Phillips

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

scintillation index; diffuser; atmospheric turbulence; signal-to-noise; ratio; bit error rates; Lasercom; RANDOM-PHASE SCREEN; BIT-ERROR RATE; INTENSITY FLUCTUATIONS; LIGHT-BEAM; PROPAGATION; SPECKLE; COMMUNICATION; WAVE; Optics

Abstract

Analytic expressions for the mutual coherence function (MCF) and the scintillation index of a partially coherent lowest order Gaussian beam wave propagating through the atmosphere (based on Kolmogorov spectrum model) are developed for the pupil plane of a receiving system. Partial coherence of the beam is modeled as a thin (complex) phase screen with Gaussian spectrum (Rytov theory and ABCD ray matrices are applied). The relation between the second- and fourth-order statistics for a beam with any degree of coherence in the atmosphere is introduced with the help of "effective" beam parameters, deduced from the free-space MCF. In particular, the scintillation (in weak and strong atmospheric conditions), based on these parameters, is studied as a function of the diffuser's strength and that of the atmosphere. The model is applied for the calculation of the SNR and bit error rates (OOK modulation) of the communication link with diffuser at the transmitter and slow detection system. The improvement of bit error rates is observed in weak and strong atmospheric turbulence. In the weak regime, the optimal diffuser can be found.

Journal Title

Optical Engineering

Volume

43

Issue/Number

2

Publication Date

1-1-2004

Document Type

Article; Proceedings Paper

Language

English

First Page

330

Last Page

341

WOS Identifier

WOS:000220236500009

ISSN

0091-3286

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