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利用光反馈半导体激光器产生的混沌激光作为物理熵源,通过光电转换、模数转换以及异或处理等手段,实验获得了码率可调谐的随机码.基于这一原理,研制出了最高码率为2.5 Gbit/s的物理随机码发生器样机.该样机能长时间稳定工作,可实时输出码率与通信速率相一致的随机码——155 Mbit/s,622 Mbit/s,1.25 Gbit/s,2.5 Gbit/s等.所产生的随机码均可通过NIST随机数测试标准,可为实现绝对安全的“一次一密”保密通信提供高速实时物理密钥.
Using the chaos laser generated by the optical feedback semiconductor laser as the physical entropy source, a random code with a tunable code rate is obtained by means of photoelectric conversion, analog-digital conversion and XOR processing etc. Based on this principle, a maximum code rate 2.5Gbit / s physical random code generator prototype, the prototype can work stably for a long time, real-time output rate and the communication rate of the same random code - 155 Mbit / s, 622 Mbit / s, 1.25 Gbit / s , 2.5 Gbit / s, etc. The generated random code can all pass the NIST random number test standard, which can provide a high-speed real-time physical key for achieving “absolutely secure” "one-time and one-