Departament de Fisica i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Edifici GAIA, Rambla de Sant Nebridi s∕n, 08222 Terrassa, Spain.
Chaos. 2011 Dec;21(4):043102. doi: 10.1063/1.3644392.
We study experimentally the synchronization dynamics of two semiconductor lasers coupled unidirectionally via two different delayed paths. The emitter laser operates in a chaotic regime characterized by low-frequency fluctuations due to optical feedback and induces a synchronized dynamical activity in the receiver laser, which operates in the continuous-wave regime when uncoupled. Different delays in the two coupling paths lead to the coexistence of two time lags in the synchronized dynamics of the oscillators. This dual-lag synchronization degrades the average synchronization quality of the system of coupled lasers and hinders the transmission of information between them. Numerical simulation results agree with the experimental observations, and allow us to explore this phenomenon in a wide parameter range, and quantify the degree of signal transmission degradation caused by this chaotic path-delay interference.
我们通过两个不同的延迟路径实验研究了两个半导体激光器的单向耦合的同步动力学。发射激光工作在由光反馈引起的低频波动的混沌状态，并在未耦合时以连续波状态诱导接收器激光产生同步动力学活动。两个耦合路径中的不同延迟导致振荡器的同步动力学中存在两个时滞的共存。这种双时滞同步会降低耦合激光器系统的平均同步质量，并阻碍它们之间的信息传输。数值模拟结果与实验观察结果一致，并允许我们在广泛的参数范围内探索这种现象，并量化由这种混沌路径延迟干扰引起的信号传输劣化程度。
