Journal
PHYSICAL REVIEW A
Volume 106, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.033519
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Funding
- Agence Nationale de la Recherche (Programme Investissements d'Avenir, I -SITE VERIFICO)
- Ministry of Higher Education and Research, Hauts de France Council
- European Regional Development Fund
- CNRS
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The thermalization process of the Fermi-Pasta-Ulam-Tsingou recurrence process in optical fibers is observed. The transition from a reversible regime to an irreversible one is shown, revealing a spectrally thermalized state. The study is significant for understanding the thermalization process in optical fibers.
We report the observation of the thermalization of the Fermi-Pasta-Ulam-Tsingou recurrence process in optical fibers. We show the transition from a reversible regime to an irreversible one, revealing a spectrally thermalized state. To do so, we actively compensate the fiber loss to make the observation of several recurrences possible. We inject into the fiber a combination of three coherent continuous waves, which we call Fourier modes, and a random noise. We enhance the noise-driven modulation instability process against the coherent one by boosting the input noise power level to speed up the evolution to the thermalization. The distributions of the Fourier modes' power along the fiber length are recorded thanks to a multiheterodyne time-domain reflectometer. At low input noise levels, we observe up to four recurrences. Whereas, at higher noise levels, the Fourier modes fade into the noise-driven modulation instability spectrum, revealing that the process reached an irreversible thermalized state.
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