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Coupling-mediated ghost resonance in mutually injected lasers.

Javier M Buldú1, C M González, J Trull

  • 1Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.

Chaos (Woodbury, N.Y.)
|April 20, 2005
PubMed
Summary
This summary is machine-generated.

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Researchers observed ghost resonance in coupled nonlinear systems, where synchronized optical pulses appear at a frequency not present in the input signals. This phenomenon emerges from the complex dynamics of externally driven semiconductor lasers.

Area of Science:

  • Nonlinear Dynamics
  • Optics and Photonics
  • Complex Systems

Background:

  • Coupled nonlinear systems, such as mutually injected semiconductor lasers, exhibit complex behaviors under external forcing.
  • Understanding emergent phenomena in such systems is crucial for applications in secure communication and signal processing.

Purpose of the Study:

  • To experimentally and numerically investigate the occurrence of ghost resonance in coupled nonlinear systems.
  • To analyze the conditions under which ghost resonance appears in externally modulated semiconductor lasers.

Main Methods:

  • Utilized a system of two mutually injected semiconductor lasers.
  • Applied external periodic perturbations to the pump currents of both lasers with distinct frequencies (f1 and f2).
  • Performed both experimental measurements and numerical simulations to observe system dynamics.

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Main Results:

  • Observed synchronized optical pulses in the form of irregular dropout events for small modulation amplitudes.
  • Demonstrated the emergence of ghost resonance, characterized by a dropout appearance frequency (fr) not present in the input driving signals.
  • Showcased that ghost resonance can be controlled by adjusting the amplitude and frequencies of the external modulations.

Conclusions:

  • Ghost resonance is a verifiable phenomenon in coupled nonlinear systems like semiconductor lasers.
  • The study highlights the potential for generating novel frequency components through nonlinear system dynamics.
  • Findings contribute to the understanding of complex dynamics and resonance phenomena in driven nonlinear systems.