Generation of multi-channel high-speed physical random numbers originated from two chaotic signals of mutually coupled semiconductor lasers

Abstract

We propose and experimentally demonstrate a novel technique to generate multi-channel high-speed physical random numbers (PRNs) by taking two chaotic signal outputs from mutually coupled semiconductor lasers (MC-SLs) as entropy sources. First, through controlling the operation parameters of the MC-SL system, two time-delay signature (TDS) suppressed chaotic signals can be obtained. Next, each of these two chaotic signals is sampled by an 8 bit analog-to-digital converter (ADC) with a sampling rate of 10 GHz, and then a bitwise exclusive-OR (XOR) operation on the corresponding bits in samples of the chaotic signal and its time delayed signal is implemented to obtain 8 bit XOR data. Furthermore, through selecting the five least significant bits (LSBs) of 8 bit XOR data to form 5 bit Boolean sequences, two sets of PRN streams with a rate up to 50 Gbits s −1 are generated and successfully pass the NIST statistical tests. Finally, merging these two sets of 50 Gbits s −1 PRN streams by an interleaving operation, another set of the 100 Gbits s −1 PRN stream, which meets all the quality criteria of NIST statistical tests, is also acquired.

Dual-channel physical random bits generation by a master-slave vertical-cavity surface-emitting lasers chaotic system

“…In particular, the PRBs generation based on chaotic output from semiconductor lasers have received widespread attention due to its relatively strong random fluctuation of light intensity and large spectral bandwidth. By taking chaotic output from semiconductor lasers as entropy sources, the random bits at rate of Gbit s [10][11][12][13][14][15][16] and even Tbit s −1 [17][18][19] can be obtained. In 2008, Uchida et al obtained PRBs at a rate up to 1.7 Gbit s −1 by extracting random bits from two broadband chaotic laser beams with 1-bit analog-to-digital converters (ADC) and using logical exclusive-OR (XOR) operation [20].…”

Simultaneous Generation of Multi-Channel Broadband Chaotic Signals Based on Two Unidirectionally Coupled WRC-FPLDs

“…For instance, based on two single-mode SLs, Paul et al proposed a scheme for generating dual-channel chaotic signals, which are utilized as two chaotic carriers for achieving dual-channel chaotic optical communication [24]. Based on two mutually coupled DFB-SLs, Tang et al demonstrated the generation of dual-channel chaotic signals, which are taken as the chaotic entropy source to generate high-speed physical random bits [25]. Via a ring network composed of three mutually coupled DFB-SLs, Xiang et al proved that the three DFB-SLs can output three chaotic signals.…”

Fast random number generation with spontaneous emission noise of a single-mode semiconductor laser

“…In 2008, Uchida et al at the first time experimentally demonstrated a real time 1.7 Gb s −1 RNG [8], and subsequently Kante et al generated higher rate random sequences from chaotic laser sources by more efficient extracting technologies [9,10]. After the above-mentioned pioneering work, a lot of research on fast random number generation based on chaotic laser has been reported [11][12][13][14][15][16][17].…”

“…However, the chaotic laser source is essentially not a true random source, for it has a periodicity originated from the photon round trip time. To suppress this periodicity, some postprocessing methods like Exclusive OR operation [8,11,12] or high derivative computing [9,10,[13][14][15][16][17] are needed. Actually more meaningful, completely true random entropy sources should be utilized instead of chaotic laser.…”