Synchronization properties of coupled semiconductor lasers subject to filtered optical feedback.
Synchronization properties of coupled semiconductor lasers subject to filtered optical feedback.
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DOI：
10.1103/physreve.78.046218
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
M. C. Soriano;F. Ruiz-Oliveras;P. Colet;C. Mirasso
中科院分区：
文献类型：
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作者：
M. C. Soriano;F. Ruiz-Oliveras;P. Colet;C. Mirasso
数值研究了两个单向耦合半导体激光器在滤波光反馈作用下的同步特性。通过添加一个扰动（一个消息）的主激光器的输出，我们表明，互信息允许区分混沌同步（在低到中等耦合强度）和注入锁定（在大耦合强度）。我们发现，一个接收器的反馈类似的发射器（闭环接收器）显示更好的同步与主激光器相比，没有反馈的接收器（开环接收器）。闭环接收机也表现出更好的能力，以恢复弱消息。反馈回路中的滤波器允许减小混沌载波的带宽，相对于常规反馈情况改善同步，并且需要较小的耦合强度，复杂性损失较小。
We study numerically the synchronization properties of two unidirectionally coupled semiconductor lasers subject to filtered optical feedback. By adding a perturbation (a message) to the output of the master laser, we show that mutual information allows distinguishing between chaotic synchronization (at low to moderate coupling strengths) and injection locking (at large coupling strength). We find that a receiver subject to a feedback similar to that of the emitter (closed-loop receiver) shows better synchronization with the master laser when compared with a receiver without feedback (open-loop receiver). Closed-loop receivers also show better capability to recover weak messages. The filter in the feedback loop allows reducing the bandwidth of the chaotic carrier, improves the synchronization with respect to the conventional feedback case, and requires less coupling strength with a minor loss in complexity.