Open AccessFast random bit generation with bandwidth-enhanced chaos in semiconductor lasers
Author(s) -
Kunihito Hirano,
T. Yamazaki,
Shinichiro Morikatsu,
Haruka Okumura,
Hiroki Aida,
Atsushi Uchida,
Shigeru Yoshimori,
Kazuyuki Yoshimura,
Takahisa Harayama,
Peter Davis
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.005512
Subject(s) - random number generation , randomness , chaotic , oscilloscope , semiconductor laser theory , bandwidth (computing) , gigabit , optics , computer science , laser , physics , electronic engineering , telecommunications , algorithm , mathematics , statistics , artificial intelligence , detector , engineering
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).