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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22692–22699

Stochastic logic gate that exploits noise and polarization bistability in an optically injected VCSEL

Sandro Perrone, Ramon Vilaseca, and Cristina Masoller  »View Author Affiliations

Optics Express, Vol. 20, Issue 20, pp. 22692-22699 (2012)

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We study numerically the dynamics of a vertical-cavity surface-emitting laser (VCSEL) with optical injection and show that the interplay of polarization bistability and noise yields a reliable logic output to two logic inputs. Specifically, by encoding the logic inputs in the strength of the light injected into the suppressed polarization mode of the VCSEL (the so-called ‘orthogonal’ injection), and by decoding the output logic response from the polarization state of the emitted light, we demonstrate an all-optical stochastic logic gate that exploits the ubiquitous presence of noise. It gives the correct logic output response for as short as 5 ns bit times when the dimensionless spontaneous emission coefficient, βsp, is within the range 10−4-10−1. Considering that typical values of βsp in semiconductor lasers are in the range 10−5-10−4, the VCSEL-based logic gate can be implemented with nowadays commercially available VCSELs, exploiting either their intrinsic noise, or external and background noise sources.

© 2012 OSA

OCIS Codes
(140.3430) Lasers and laser optics : Laser theory
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers

ToC Category:
Lasers and Laser Optics

Original Manuscript: June 22, 2012
Revised Manuscript: September 4, 2012
Manuscript Accepted: September 4, 2012
Published: September 19, 2012

Sandro Perrone, Ramon Vilaseca, and Cristina Masoller, "Stochastic logic gate that exploits noise and polarization bistability in an optically injected VCSEL," Opt. Express 20, 22692-22699 (2012)

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