基于SOA光纤环形激光器的混沌光源在多路随机数产生中的应用

As internet services merge with traditional industry, mobile payment and sensitive information transfer among individuals as well as groups have become everyday activities. Such development leads to unprecedentedly high demands for secure transmission of network information. Through the combination of secure communication on the physical layer and traditional computer-based network security technologies, the problem could be solved from the origin. Optical chaotic signal is an ideal carrier for high-speed secure communication. True random number generation (TRNG), on the other hand, is universally required by data encryption and key distribution in secure communication systems. In this project, we aim at developing a highly wavelength flexible optical chaotic source, based on a semiconductor optical amplifier (SOA) fiber ring laser (FRL), to act as the physical source for TRNG. The investigation is expected to benefit the future development of fiber optic chaotic communication system towards the direction of wavelength division multiplexing architecture. Theoretical analysis, numerical simulation, and experimental investigation are to be jointly adopted in this project. We will first develop a broadly tunable single-wavelength chaotic laser based on a SOA-FRL, and verify its application in TRNG. Then we will explore the feasibility of multi-wavelength chaotic lasing in a SOA-FRL, and the potential application in multi-channel TRNG. Additionally, we will use multi-band spectral slicing of the broadband chaotic output from a SOA-FRL to build a multi-wavelength optical chaotic source, and investigate its application in multi-channel TRNG. Based on the results, we will establish the preliminary guidance for the choice of optical chaotic source in wavelength division multiplexed fiber optic chaotic communication systems.

近几年，“互联网+”推动了网络服务与传统行业的深度融合，移动支付和个人、团体敏感信息传递逐渐成为日常生活不可分割的一部分。因此，用户对网络信息安全传输提出了前所未有之高要求。通过将物理层保密通信与传统计算机保密技术结合，能从根源上解决信息传输的安全性问题。混沌光信号是高速保密通信的一种重要载体，而真随机数发生器则在保密通信中的数据加密和密钥分配中有广泛的应用。本项目旨在基于半导体光放大器光纤环形激光器（SOA-FRL）构建具有高度波长灵活性的混沌光源，并将其作为随机信号源应用到真随机数发生（TRNG）中，为未来混沌光通信向波分复用方向发展奠定基础。项目采用理论分析、数值仿真及实验验证，深入研究：①基于SOA-FRL的宽调谐单波长混沌激光器在TRNG中的应用；②基于SOA-FRL的多波长混沌激光器在TRNG中的应用；③基于SOA-FRL宽谱混沌激光光谱分割的多波长混沌光源在TRNG中的应用。

本项目以半导体光放大器（SOA）为增益介质构建光纤环形激光器（FRL），研究激光器中的混沌震荡现象，主要目的是提高混沌光源的波长灵活性并研究其作为物理随机信号源在TRNG中的应用。通过理论分析、模型仿真和实验研究相结合的方式实现了①基于SOA-FRL的宽谱混沌光源：通过计算最大Lyapunov指数验证了这一光源的混沌性；明确了长光纤成腔的SOA-FRL中的混沌产生与光纤中的调制不稳定性密切相关；证明了激光器两正交偏振方向输出的两路混沌信号是相互独立的；证明了当激光器双向发射时两传输方向输出的两路混沌信号是相互独立的。②基于SOA-FRL和腔内可调谐光滤波器的谱宽/中心波长可调谐混沌激光：研究了光滤波器通带宽度对混沌信号质量的影响，通过TRNG和NIST随机数统计测试，发现光滤波器通带宽度不小于1.5nm时能保证较低的TDS，满足高质量TRNG需求；研究了光滤波器中心波长对混沌信号质量的影响，发现光滤波器通带宽度为1.5 nm、中心波长在1540~1560nm间调谐时能保证较低的TDS，满足高质量TRNG需求。③基于SOA-FRL和多通带光滤波器的多波长混沌光源：通过对SOA-FRL产生的宽谱混沌激光进行腔外光谱切割实现了多波长混沌光源，验证了多路输出之间的独立性，8路输出做并行TRNG时通过NIST测试的概率为98.33%；通过在腔内引入透射式双通带光滤波器实现了双波长混沌激光并验证两路输出的独立性；通过在腔内引入反射式多通带光滤波器实现了四波长混沌激光，波长间隔不小于1.75nm时可保证多路混沌信号独立性，预估系统最大波分复用容量为12。此外，④利用FBG阵列的分布式反馈抑制了激光二极管中混沌信号的时延特征（TDS），最低TDS值仅为0.0026；TDS抑制效果对失谐频率和反馈比均不敏感。项目研究的SOA-FRL大大提高了混沌激光器的波长灵活性，可有效满足波分复用混沌保密通信的光源需求，也可作为物理随机信号源满足多路高速TRNG（多路并行输出）或超高速TRNG（多路串行输出）的需求。基于FBG阵列光反馈的混沌TDS抑制方法不仅能实现TDS隐藏，且对失谐频率和反馈比均不敏感，提供了一种高品质且强稳健的混沌激光光源。

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