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Electro-optic delay oscillator with nonlocal nonlinearity: Optical phase dynamics, chaos, and synchronization

Roman Lavrov, Michael Peil, Maxime Jacquot, Laurent Larger, Vladimir Udaltsov, and John Dudley

  • Department of Optics, UMR CNRS FEMTO-ST 6174, University of Franche–Comté, 16 Route de Gray, 25030 Besançon Cedex, France

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Phys. Rev. E 80, 026207 – Published 19 August, 2009

DOI: https://doi.org/10.1103/PhysRevE.80.026207

Abstract

We demonstrate experimentally how nonlinear optical phase dynamics can be generated with an electro-optic delay oscillator. The presented architecture consists of a linear phase modulator, followed by a delay line, and a differential phase-shift keying demodulator (DPSK-d). The latter represents the nonlinear element of the oscillator effecting a nonlinear transformation. This nonlinearity is considered as nonlocal in time since it is ruled by an intrinsic differential delay, which is significantly greater than the typical phase variations. To study the effect of this specific nonlinearity, we characterize the dynamics in terms of the dependence of the relevant feedback gain parameter. Our results reveal the occurrence of regular GHz oscillations (approximately half of the DPSK-d free spectral range), as well as a pronounced broadband phase-chaotic dynamics. Beyond this, the observed dynamical phenomena offer potential for applications in the field of microwave photonics and, in particular, for the realization of novel chaos communication systems. High quality and broadband phase-chaos synchronization is also reported with an emitter-receiver pair of the setup.

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Phys. Rev. E 80, 026207– Published 19 August, 2009
  • Received 7 September 2008

© 2009 American Physical Society

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