论文标题
观察光纤中Fermi-Pasta-Pasta-tsingou复发的噪声驱动的热化
Observation of the noise-driven thermalization of the Fermi-Pasta-Ulam-Tsingou recurrence in optical fibers
论文作者
论文摘要
我们报告了光纤维中费米 - 帕斯塔 - 乌拉姆 - tsingou复发过程的热化的观察。我们展示了从可逆的态度到不可逆的转变，揭示了频谱热的状态。为此，我们积极补偿纤维损失，以使观察几种复发。我们将三个连贯连续波的组合注入纤维，我们称之为傅立叶模式和随机噪声。我们通过提高输入噪声功率水平以加快对热化的演变来增强噪声驱动的调制不稳定性过程。借助多局差的时间域反射仪，记录了沿光纤长度的傅立叶模式功率的分布。在低输入噪声水平下，我们最多观察到四次复发。鉴于，在较高的噪声水平下，傅立叶模式逐渐淡化为噪声驱动的调制不稳定性频谱，这表明该过程达到了不可逆的热态状态。
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 multi-heterodyne 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.
