Chaotic unpredictability properties of small network mutually-coupled laser diodes
Chaotic unpredictability properties of small network mutually-coupled laser diodes
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DOI：
10.1016/j.optcom.2013.08.072
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发表时间：
2013-01
影响因子：
2.4
通讯作者：
S. Xiang;S. Xiang;W. Pan;Nianqiang Li;Liyue Zhang;H. Zhu
中科院分区：
文献类型：
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作者：
S. Xiang;S. Xiang;W. Pan;Nianqiang Li;Liyue Zhang;H. Zhu
对相互耦合半导体激光器（LD）的混沌不可预测性进行了数值研究。通过排列熵（PE）定量评价不可预测性程度。耦合强度，频率失谐，反馈强度，以及时间延迟的影响。结果表明，与单向耦合情况相比，互耦合情况下可以同时产生两个不可预测性增强的混沌信号，并且导致不可预测性增强混沌的参数范围也有所拓宽.此外，PE值为两个相互耦合的LD是彼此接近的，与确切的关系是有关的频率失谐，由于在注入锁定效应方面的领先-落后的关系。我们还考虑了小型网络的相互耦合的LD，连接拓扑结构和频率失谐的影响，主要是检查。相互耦合的LD的小网络可以并行地产生多个独立的不可预测性增强的混沌信号，这对于大幅提高基于混沌LD的随机数发生器的比特率和提高随机性是非常有用的。
The chaotic unpredictability properties of mutually-coupled laser diodes (LDs) are investigated numerically. The unpredictability degree is evaluated quantitatively via the permutation entropy (PE). The effects of coupling strength, frequency detuning, feedback strength, as well as time delays are considered. It is shown that, compared with the unidirectional coupling case, two unpredictability-enhanced chaotic signals can be simultaneously obtained for the mutual coupling case, and the parameters regions contributing to unpredictability-enhanced chaos are also broadened. Besides, the PE values for two mutually-coupled LDs are close to each other, with the exact relationship being related to frequency detuning, due to the leader-laggard relationship in terms of injection locking effect. We also consider small network of mutually-coupled LDs, where the effects of connection topologies and frequency detuning are mainly examined. The small network of mutually-coupled LDs can generate several independent unpredictability-enhanced chaotic signals in parallel, which is extremely useful to substantially increase the bit rate and improve the randomness of random number generators based on chaotic LDs.