Random bit generation at tunable rates using a chaotic semiconductor laser under distributed feedback.
Random bit generation at tunable rates using a chaotic semiconductor laser under distributed feedback.
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DOI：
10.1364/ol.40.003970
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发表时间：
2015-09
期刊：
影响因子：
3.6
通讯作者：
Xiao-Zhou Li;Songsui Li;J. Zhuang;Sze-Chun Chan
中科院分区：
文献类型：
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作者：
Xiao-Zhou Li;Songsui Li;J. Zhuang;Sze-Chun Chan
研究了一种用于随机比特产生的光纤布拉格光栅（FBG）分布反馈半导体激光器。反馈扰动激光器以周期性采样的强度混沌地发射。然后通过简单的自差分和选择位的后处理将样本转换为随机位。与提供局部反馈的传统反射镜不同，FBG提供分布式反馈，其有效地抑制了往返反馈延迟时间的信息。即使当采样周期与激光器和光栅之间的反馈延迟相称时，也确保了随机性。因此，在RBG中，FBG反馈能够连续调谐输出比特率，减少最小采样周期，并增加每个样本选择的比特数。RBG的实验研究在一个连续可调的采样周期从超过16 ns下降到50 ps，而反馈延迟固定在7.7 ns。通过每个样本选择5个最低有效位，可以实现0.3至100 Gbps的输出比特率，并通过美国国家标准与技术研究所测试套件进行随机性检查。
A semiconductor laser with distributed feedback from a fiber Bragg grating (FBG) is investigated for random bit generation (RBG). The feedback perturbs the laser to emit chaotically with the intensity being sampled periodically. The samples are then converted into random bits by a simple postprocessing of self-differencing and selecting bits. Unlike a conventional mirror that provides localized feedback, the FBG provides distributed feedback which effectively suppresses the information of the round-trip feedback delay time. Randomness is ensured even when the sampling period is commensurate with the feedback delay between the laser and the grating. Consequently, in RBG, the FBG feedback enables continuous tuning of the output bit rate, reduces the minimum sampling period, and increases the number of bits selected per sample. RBG is experimentally investigated at a sampling period continuously tunable from over 16 ns down to 50 ps, while the feedback delay is fixed at 7.7 ns. By selecting 5 least-significant bits per sample, output bit rates from 0.3 to 100 Gbps are achieved with randomness examined by the National Institute of Standards and Technology test suite.