Fast random bits generation based on a single chaotic semiconductor ring laser.
Fast random bits generation based on a single chaotic semiconductor ring laser.
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DOI：
10.1364/oe.20.028603
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发表时间：
2012-12
期刊：
影响因子：
3.8
通讯作者：
R. M. Nguimdo;G. Verschaffelt;J. Danckaert;X. Leijtens;J. Bolk;G. Van der Sande
中科院分区：
文献类型：
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作者：
R. M. Nguimdo;G. Verschaffelt;J. Danckaert;X. Leijtens;J. Bolk;G. Van der Sande
使用由逐位异或和最低有效位提取组成的后处理方法来产生随机位序列通常需要两个不同的混沌输出。虽然这两个信号通常使用两个分离的装置（例如，两个法布里-珀罗激光器）来生成，但是由于单个半导体环形激光器的圆形对称性，其可以用作替代方案，这有助于在两个反向传播模式方向上发射激光。我们考虑了一个混沌半导体环形激光器，并从数值和实验两方面研究了它的快速随机比特产生特性。特别地，我们证明了通过使用8位模数转换器对每个方向模式的输出信号进行采样，并通过对两个结果信号进行异或运算（丢弃4个最高有效位后），我们可以获得比特率为4 × 10 = 40 Gbit/s的快速随机比特流，通过统计随机性测试。为了优化系统性能，我们还研究了随机性对主要系统参数和噪声的依赖性。
The use of the postprocessing method consisting of bitwise Exclusive-OR and least significant bits extraction to generate random bit sequences typically requires two distinct chaotic outputs. While the two signals are, in general, generated using two separated devices, e.g. two Fabry-Perot lasers, a single semiconductor ring laser can be used as an alternative due to its circular symmetry which facilitates lasing in two counterpropagating mode directions. We consider a chaotic semiconductor ring laser and investigate both numerically and experimentally its characteristics for fast random bit generation. In particular, we show that by sampling each directional mode's output signal using a 8-bit analog-digital converter and through Exclusive-OR operation applied to the two resulting signals (after throwing away 4 most significant bits), we can achieve fast random bit-streams with a bit rate 4 × 10 = 40 Gbit/s, passing the statistical randomness tests. To optimize the system performance, we also study the dependence of randomness on the main system parameters and on noise.