Lasers, Fiber Optics, and Communications

Improved performance of analog and digital acousto-optic modulation with feedback under profiled beam propagation for secure communication using chaos

[+] Author Affiliations
Fares S. Almehmadi

University of Dayton, Department of Electrical and Computer Engineering, 300 College Park, Dayton, Ohio 45469, United States

Monish R. Chatterjee

University of Dayton, Department of Electrical and Computer Engineering, 300 College Park, Dayton, Ohio 45469, United States

Opt. Eng. 53(12), 126102 (Dec 03, 2014). doi:10.1117/1.OE.53.12.126102
History: Received September 10, 2014; Accepted November 4, 2014
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Abstract.  Using intensity feedback, the closed-loop behavior of an acousto-optic hybrid device under profiled beam propagation has been recently shown to exhibit wider chaotic bands potentially leading to an increase in both the dynamic range and sensitivity to key parameters that characterize the encryption. In this work, a detailed examination is carried out vis-à-vis the robustness of the encryption/decryption process relative to parameter mismatch for both analog and pulse code modulation signals, and bit error rate (BER) curves are used to examine the impact of additive white noise. The simulations with profiled input beams are shown to produce a stronger encryption key (i.e., much lower parametric tolerance thresholds) relative to simulations with uniform plane wave input beams. In each case, it is shown that the tolerance for key parameters drops by factors ranging from 10 to 20 times below those for uniform plane wave propagation. Results are shown to be at consistently lower tolerances for secure transmission of analog and digital signals using parameter tolerance measures, as well as BER performance measures for digital signals. These results hold out the promise for considerably greater information transmission security for such a system.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Fares S. Almehmadi and Monish R. Chatterjee
"Improved performance of analog and digital acousto-optic modulation with feedback under profiled beam propagation for secure communication using chaos", Opt. Eng. 53(12), 126102 (Dec 03, 2014). ; http://dx.doi.org/10.1117/1.OE.53.12.126102


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