提出并验证了一种基于数字化带宽增强激光混沌信号的高速随机源。为消除光反馈半导体混沌激光信号中存在的弱周期性,将光反馈混沌半导体激光注入另一激光器产生的带宽增强混沌激光信号。用8 bit高速模数转换器对输出的增强带宽混沌激光信号进行采集,实现每个采样点产生多个随机位。为去除所提取原始随机位存在的偏差和提高随机位的产生效率,提出采用基于现场可编程逻辑阵列的安全哈希算法-256来提取随机位。采用4路并行处理技术获得了2.94 Gbit/s的在线随机数产生速率,每个采样点可平均产生4.65个随机比特位。所获的随机数通过了随机性测试程序ENT和STS中所有测试项。 A high-speed random source based on digital bandwidth enhancement laser chaos signal is proposed and validated. In order to eliminate the weak periodicity in the optical feedback semiconductor chaotic laser signal, the optical feedback chaotic semiconductor laser is injected into the laser generated by another laser to enhance the chaotic laser signal. The 8bit high-speed ADC is used to collect the output enhanced bandwidth chaotic laser signals to generate multiple random bits for each sampling point. In order to remove the deviation of the extracted original random bits and improve the generation efficiency of random bits, a secure hash algorithm based on field programmable logic array-256 was proposed to extract random bits. Using 4-way parallel processing technology to obtain a 2.94 Gbit / s online random number generation rate, each sampling point can produce an average of 4.65 random bits. The obtained random number passed all the test items in the randomization test program ENT and STS.