Summary
2011 International Symposium on Nonlinear Theory and Its Applications
2011
Session Number:B1L-B
Session:
Number:B1L-B4
Post-processing method for fast random bit generation with semiconductor lasers
Yasuhiro Akizawa, Taiki Yamazaki, Atsushi Uchida, Takahisa Harayama, Satoshi Sunada, Ken-ichi Arai, Kazuyuki Yoshimura, Peter Davis,
pp.338-341
Publication Date:2011/9/4
Online ISSN:2188-5079
Summary:
We propose a post-processing method for fast random bit generation with chaotic semiconductor lasers. Chaotic laser output and its time-delayed signal are sampled and converted into 8 bit values. The order of the 8 bit sequence of the time-delayed signal is reversed and bitwise exclusive-or operation is executed between the bit-order-reversed signal and the original chaotic signal, resulting in random bit sequences. For the proposed postprocessing method, it is not necessary to extract the least significant bit from random bits to obtain good-quality random bit sequences. Experiments with off-line postprocessing indicate that the equivalent generation rate of random bit sequences can be achieved up to 400 Giga bit per second (Gb/s) (8 bit/sample × 50 Gigasample/second). The randomness of the generated bit sequences are tested by using statistical tests of randomness. We investigate the bias of each significant bit and it is found that the proposed post-processing method can succeed in generating uniform distribution of the bias of each significant bit.