Deng Yu, Fan Zhuo-Fei, Zhao Bin-Bin, Wang Xing-Guang, Zhao Shiyuan, Wu Jiagui, Grillot Frédéric, Wang Cheng
School of Information Science and Technology, ShanghaiTech University, Shanghai, 201210, China.
LTCI, Institut Polytechnique de Paris, Télécom Paris, 19 place Marguerite Perey, 91120, Palaiseau, France.
Light Sci Appl. 2022 Jan 2;11(1):7. doi: 10.1038/s41377-021-00697-1.
Chaos in nonlinear dynamical systems is featured with irregular appearance and with high sensitivity to initial conditions. Near-infrared light chaos based on semiconductor lasers has been extensively studied and has enabled various applications. Here, we report a fully-developed hyperchaos in the mid-infrared regime, which is produced from interband cascade lasers subject to the external optical feedback. Lyapunov spectrum analysis demonstrates that the chaos exhibits three positive Lyapunov exponents. Particularly, the chaotic signal covers a broad frequency range up to the GHz level, which is two to three orders of magnitude broader than existed mid-infrared chaos solutions. The interband cascade lasers produce either periodic oscillations or low-frequency fluctuations before bifurcating to hyperchaos. This hyperchaos source is valuable for developing long-reach secure optical communication links and remote chaotic Lidar systems, taking advantage of the high-transmission windows of the atmosphere in the mid-infrared regime.
非线性动力系统中的混沌具有不规则的外观以及对初始条件的高度敏感性。基于半导体激光器的近红外光混沌已得到广泛研究，并实现了各种应用。在此，我们报告了一种在中红外波段完全发展的超混沌，它由受到外部光反馈的带间级联激光器产生。李雅普诺夫谱分析表明，该混沌呈现出三个正的李雅普诺夫指数。特别地，混沌信号覆盖了高达吉赫兹水平的宽频率范围，这比现有的中红外混沌解决方案宽两到三个数量级。带间级联激光器在分叉到超混沌之前会产生周期性振荡或低频波动。利用中红外波段大气的高传输窗口，这种超混沌源对于开发长距离安全光通信链路和远程混沌激光雷达系统具有重要价值。
