In this work, via autocorrelation function (ACF) and permutation entropy (PE) methods, we numerically investigate the time-delay signature (TDS) characteristics of the chaotic signal output from an optoelectronic oscillator (OEO) after introducing an extra optical feedback loop. The results demonstrate that, for such a chaotic system, both the optoelectronic feedback with a delay time of T and the optical feedback with a delay time of T contribute to the TDS of generated chaos. The TDS of the chaotic signal should be evaluated within a large time window including T and T by the strongest peak in the ACF curve of the chaotic signal, and the strongest peak may locate at near T or T. Through mapping the evolution of the TDS in the parameter space of the optical feedback strength and time, certain optimized parameter regions for achieving a chaotic signal with a relatively weak TDS can be determined.
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| http://dx.doi.org/10.1007/s12200-019-0960-z | DOI Listing |
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