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Optical Engineering

Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback
Author(s): Monish R. Chatterjee; Mohammed A. Al-Saedi
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Paper Abstract

Generation of chaos from acousto-optic (A-O)Bragg cell modulators with an electronic feedback has been studied for over 3 decades. Since an acousto-optic Bragg cell with zeroth- and first-order feedback exhibits chaotic behavior past the threshold for bistability, such a system was recently examined for possible chaotic encryption of simple messages (such as a low-amplitude sinusoidal signal) applied via the bias input of the sound cell driver. Subsequent recovery of the message signal was carried out via a heterodyne-type strategy employing a locally generated chaotic carrier, with threshold parameters matched to the transmitting Bragg cell. In this paper, we present numerical results and detailed interpretations for signal encryption and recovery under hybrid A-O electronic feedback using a heterodyne strategy. Important features of this setup, such as the system robustness in terms of parameter matching (feedback gain, dc bias, and time delay) are also examined in some detail.

Paper Details

Date Published: 1 May 2011
PDF: 15 pages
Opt. Eng. 50(5) 055002 doi: 10.1117/1.3574106
Published in: Optical Engineering Volume 50, Issue 5
Show Author Affiliations
Monish R. Chatterjee, Univ. of Dayton (United States)
Mohammed A. Al-Saedi, Univ. of Dayton (United States)

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