Fast random bit generation with bandwidth-enhanced chaos in semiconductor lasers.
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).
Hirano
Kunihito
K
Department of Electronics and Computer Systems, Takushoku University, 815-1 Tatemachi, Hachioji, Tokyo 193-0985, Japan.
Yamazaki
Taiki
T
Morikatsu
Shinichiro
S
Okumura
Haruka
H
Aida
Hiroki
H
Uchida
Atsushi
A
Yoshimori
Shigeru
S
Yoshimura
Kazuyuki
K
Harayama
Takahisa
T
Davis
Peter
P
D003198:Computer Simulation; D054023:Lasers, Semiconductor; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*