Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback

Monish R. Chatterjee; Mohammed A. Al-Saedi

doi:10.1117/1.3574106

1 May 2011 Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback

Monish R. Chatterjee, Mohammed A. Al-Saedi

Author Affiliations +

Optical Engineering, Vol. 50, Issue 5, 055002 (May 2011). https://doi.org/10.1117/1.3574106

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.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Monish R. Chatterjee and Mohammed A. Al-Saedi "Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback," Optical Engineering 50(5), 055002 (1 May 2011). https://doi.org/10.1117/1.3574106

Published: 1 May 2011

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