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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 27 — Dec. 17, 2012
  • pp: 28603–28613

Fast random bits generation based on a single chaotic semiconductor ring laser

Romain Modeste Nguimdo, Guy Verschaffelt, Jan Danckaert, Xaveer Leijtens, Jeroen Bolk, and Guy Van der Sande  »View Author Affiliations


Optics Express, Vol. 20, Issue 27, pp. 28603-28613 (2012)
http://dx.doi.org/10.1364/OE.20.028603


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Abstract

The use of the postprocessing method consisting of bitwise Exclusive-OR and least significant bits extraction to generate random bit sequences typically requires two distinct chaotic outputs. While the two signals are, in general, generated using two separated devices, e.g. two Fabry-Perot lasers, a single semiconductor ring laser can be used as an alternative due to its circular symmetry which facilitates lasing in two counterpropagating mode directions. We consider a chaotic semiconductor ring laser and investigate both numerically and experimentally its characteristics for fast random bit generation. In particular, we show that by sampling each directional mode’s output signal using a 8-bit analog-digital converter and through Exclusive-OR operation applied to the two resulting signals (after throwing away 4 most significant bits), we can achieve fast random bit-streams with a bit rate 4 × 10 = 40 Gbit/s, passing the statistical randomness tests. To optimize the system performance, we also study the dependence of randomness on the main system parameters and on noise.

© 2012 OSA

OCIS Codes
(030.6600) Coherence and statistical optics : Statistical optics
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(140.1540) Lasers and laser optics : Chaos
(140.3560) Lasers and laser optics : Lasers, ring

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: October 5, 2012
Revised Manuscript: November 16, 2012
Manuscript Accepted: November 16, 2012
Published: December 10, 2012

Citation
Romain Modeste Nguimdo, Guy Verschaffelt, Jan Danckaert, Xaveer Leijtens, Jeroen Bolk, and Guy Van der Sande, "Fast random bits generation based on a single chaotic semiconductor ring laser," Opt. Express 20, 28603-28613 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-27-28603


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