19 May 2008 Time delay extraction in chaotic cryptosystems based on optoelectronic feedback with variable delay
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Abstract
Chaotic wavelength transmitters based on a DBR laser submitted to optoelectronic feedback with periodic time delay are considered. We investigate the retrieval of the periodic time delay function from experimental time series. Square-wave and sinusoidal modulations are considered for the frequency clock of a delay module based on a First-In First-Out memory. It is shown that the period of the time delay can be extracted from experimental data by using the mutual information function. Different values of the nonlinearity are considered. Applying a modified filling factor method the periodic time delay function is retrieved in the sinusoidal modulation case for different periods and modulation depths.
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S. Ortín, M. Jacquot, L. Pesquera, M. Peil, L. Larger, "Time delay extraction in chaotic cryptosystems based on optoelectronic feedback with variable delay", Proc. SPIE 6997, Semiconductor Lasers and Laser Dynamics III, 69970E (19 May 2008); doi: 10.1117/12.781418; https://doi.org/10.1117/12.781418
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