Hirano Kunihito, Yamazaki Taiki, Morikatsu Shinichiro, Okumura Haruka, Aida Hiroki, Uchida Atsushi, Yoshimori Shigeru, Yoshimura Kazuyuki, Harayama Takahisa, Davis Peter
Department of Electronics and Computer Systems, Takushoku University, 815-1 Tatemachi, Hachioji, Tokyo 193-0985, Japan.
Opt Express. 2010 Mar 15;18(6):5512-24. doi: 10.1364/OE.18.005512.
We experimentally demonstrate random bit generation using multi-bit samples of bandwidth-enhanced chaos in semiconductor lasers. Chaotic fluctuation of laser output is generated in a semiconductor laser with optical feedback and the chaotic output is injected into a second semiconductor laser to obtain a chaotic intensity signal with bandwidth enhanced up to 16 GHz. The chaotic signal is converted to an 8-bit digital signal by sampling with a digital oscilloscope at 12.5 Giga samples per second (GS/s). Random bits are generated by bitwise exclusive-OR operation on corresponding bits in samples of the chaotic signal and its time-delayed signal. Statistical tests verify the randomness of bit sequences obtained using 1 to 6 bits per sample, corresponding to fast random bit generation rates from 12.5 to 75 Gigabit per second (Gb/s) ( = 6 bit x 12.5 GS/s).
我们通过实验证明了利用半导体激光器中带宽增强混沌的多位样本进行随机比特生成。在具有光反馈的半导体激光器中产生激光输出的混沌波动，并将混沌输出注入到第二个半导体激光器中，以获得带宽增强至16 GHz的混沌强度信号。通过使用数字示波器以每秒12.5吉采样（GS/s）的速率对混沌信号进行采样，将其转换为8位数字信号。通过对混沌信号样本及其延时信号的相应位进行按位异或运算来生成随机比特。统计测试验证了使用每个样本1至6位所获得的比特序列的随机性，这对应于每秒12.5至75吉比特（Gb/s）（ = 6位×12.5 GS/s）的快速随机比特生成速率。
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