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Entropy 2019, 21(2), 151; https://doi.org/10.3390/e21020151

Correlations Preceding High-Intensity Events in the Chaotic Dynamics of a Raman Fiber Laser

1
Department of Physics, Eastern Washington University, Cheney, WA 99004, USA
2
Department of Physics and Astronomy, Carleton College, Northfield, MN 55057, USA
*
Author to whom correspondence should be addressed.
Received: 21 December 2018 / Revised: 29 January 2019 / Accepted: 1 February 2019 / Published: 5 February 2019
(This article belongs to the Section Complexity)
PDF [460 KB, uploaded 5 February 2019]

Abstract

We study the time series of the output intensity of a Raman fiber laser with an ordinal patterns analysis in the laminar-turbulent transition. We look for signatures among consecutive events that indicate when the system changes from triggering low-intensity to high-intensity events. We set two thresholds, a low one and a high one, to distinguish between low intensity versus high-intensity events. We find that when the time series is performing low-intensity events (below the low threshold), it shows some preferred temporal patterns before triggering high-intensity events (above a high threshold). The preferred temporal patterns remain the same all through the pump current range studied, even though two clearly different dynamical regimes are covered (laminar regime for low pump currents and turbulent regime for high pump currents). We also find that the turbulent regime shows clearer signatures of determinism than the laminar regime.
Keywords: forecasting; complex dynamics; fiber laser; chaos; ordinal patterns forecasting; complex dynamics; fiber laser; chaos; ordinal patterns
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Aragoneses, A.; Ding, Y. Correlations Preceding High-Intensity Events in the Chaotic Dynamics of a Raman Fiber Laser. Entropy 2019, 21, 151.

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