Random bit generation (RBG) with chaotic semiconductor lasers has been extensively studied because of its potential applications in secure communications and high-speed numerical simulations. Researchers in this field have mainly focused on the improvement of the generation rate and the compactness of the random bit generators. In this paper, we experimentally demonstrate the existence of two regimes of fast RBG using a single chaotic laser subjected to delayed optical feedback: the first one is based on the extraction of all min-entropy contained in each random sample, and the second one is to demonstrate a possibility of increasing the generation rate by extracting 55 bits from each variable.
An effective and robust method for generating random bits from random time intervals between quantum jumps of
optical field is proposed and experimentally tested with spontaneous switchings in a bistable vertical-cavity surface-emitting
laser. This algorithm allows one to avoid the problem of biasing in the output bit stream as well as to obtain low
correlation between generated bits. A comprehensive comparative statistical analysis of different methods of extraction
of random bits from experimentally measured time intervals between spontaneous polarization switchings in a bistable
vertical-cavity surface-emitting laser shows the advantage of the proposed method.
KEYWORDS: Carbon dioxide lasers, Gas lasers, Modulation, Signal attenuation, Dynamical systems, Complex systems, Modulators, Signal analyzers, Signal to noise ratio, Phase measurement
Nonlinear parametric effects such as the suppression of period doubling, the shift of the bifurcation point, a scaling law relating the shift and the perturbation amplitude, an influence of the detuning on the suppression, reaching of the maximum gain between original and shifted bifurcation points, and a scaling law for idler power are experimentally observed near period doubling bifurcation in a loss-driven carbon dioxide laser which is subjected to periodic loss perturbations at a subharmonic frequency.
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