Polarization chaos and random bit generation in nonlinear fiber optics induced by a time-delayed counter-propagating feedback loop

Published on 2018-01-09T21:57:33Z (GMT) by
In this manuscript, we experimentally and numerically investigate the chaotic dynamics of the state-of-polarization in a nonlinear optical fiber due to the cross-interaction between an incident signal and its intense backward replica generated at the fiber-end through an amplified reflective delayed loop. Thanks to the cross-polarization interaction between the two delayed counter-propagating waves, the output polarization exhibits fast temporal chaotic dynamics which enable a powerful scrambling process with moving speeds up to 600-krad/s. The performance of this all-optical scrambler was then evaluated on a 10-Gbit/s On/Off Keying telecom signal achieving an error-free transmission. We also describe how these temporal and chaotic polarization fluctuations can be exploited as an all-optical random number generator. To this aim, a billion bit sequence was experimentally generated and successfully confronted to the dieharder benchmarking statistic tools. Our experimental analysis are supported by numerical simulations based on the resolution of counter-propagating cou¬pled nonlinear propagation equations that confirm the observed behaviors.

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morosi, jacopo; Berti, Nicolas; Akrout, Akram; Picozzi, Antonio; Guasoni, Massimiliano; Fatome, Julien (2018): Polarization chaos and random bit generation in nonlinear fiber optics induced by a time-delayed counter-propagating feedback loop. The Optical Society.