Xu Yanping, Lu Ping, Mihailov Stephen, Bao Xiaoyi
Opt Lett. 2017 Dec 1;42(23):4796-4799. doi: 10.1364/OL.42.004796.
We demonstrate for the first time, to the best of our knowledge, a high-speed physical random bit generator at gigabits/second without the time-delay signature based on chaotic power fluctuations of a random fiber laser. The random fiber laser is configured using a ring structure with semiconductor optical amplifiers as the optical gain and a fiber random grating as the random feedback medium. The long-length ring cavity provides a large number of densely spaced cavity modes that co-exist within the gain bandwidth tailored by the optical filter. Unlike fixed cavity modes in conventional fiber ring lasers, these modes are less phase-correlated due to the random distributed feedback from the fiber random grating fabricated by a plane-by-plane inscription technique without phase control, leading to intensified lasing output fluctuations with high-dimensional chaotic dynamic natures without specific cavity features, when the random fiber laser is operated slightly above the lasing threshold. Random bit generation at a bit rate up to ∼1.6 Gbps is achieved with verified randomness through standard tests. Different from the previously reported schemes requiring offline post-processing procedures, this physical random number generator can function in real time, offering high-quality randomness and security assurance for pertinent applications.
据我们所知，我们首次展示了一种基于随机光纤激光器混沌功率波动的千兆位/秒高速物理随机比特发生器，且无时间延迟特征。该随机光纤激光器采用环形结构配置，以半导体光放大器作为光增益，以光纤随机光栅作为随机反馈介质。长环形腔提供了大量密集间隔的腔模，这些腔模共存于由光学滤波器定制的增益带宽内。与传统光纤环形激光器中的固定腔模不同，由于通过逐面写入技术制造的光纤随机光栅的随机分布反馈而没有相位控制，这些模式的相位相关性较低，当随机光纤激光器在略高于激光阈值的情况下运行时，会导致具有高维混沌动态特性且无特定腔特征的激光输出波动加剧。通过标准测试验证了随机性，实现了高达约1.6 Gbps的比特率随机比特生成。与先前报道的需要离线后处理程序的方案不同，这种物理随机数发生器可以实时运行，为相关应用提供高质量的随机性和安全保证。
