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Multipulse excitability in a semiconductor laser with optical injection.

Sebastian Wieczorek1, Bernd Krauskopf, Daan Lenstra

  • 1Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

Physical Review Letters
|February 28, 2002
PubMed
Summary

Optically injected semiconductor lasers exhibit excitable multipulses, a phenomenon organized by homoclinic bifurcations. These bifurcations define accessible regions for observing a specific number of output pulses after perturbation.

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Area of Science:

  • Nonlinear dynamics
  • Semiconductor laser physics
  • Optical engineering

Background:

  • Optically injected semiconductor lasers are known for complex dynamics.
  • Understanding pulse generation in these lasers is crucial for applications.
  • Previous studies have explored various dynamic regimes, but excitable multipulse behavior requires further investigation.

Purpose of the Study:

  • To investigate the phenomenon of excitable multipulses in optically injected semiconductor lasers.
  • To identify the organizing principles behind this multipulse behavior.
  • To explore the potential for similar phenomena in other dynamical systems.

Main Methods:

  • Experimental investigation of an optically injected semiconductor laser system.
  • Analysis of parameter space using homoclinic bifurcation curves.

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  • Characterization of laser output following a single perturbation from its steady state.

    • Main Results:

    • Demonstration of excitable multipulse generation in the studied laser system.
    • Identification of homoclinic bifurcation curves that define experimentally accessible regions for multipulse emission.
    • Observation that the number of emitted pulses is determined by the accessible regions.

    Conclusions:

    • The excitable multipulse behavior in optically injected semiconductor lasers is governed by a generic codimension-two homoclinic bifurcation.
    • Homoclinic bifurcations play a key role in organizing complex pulse dynamics.
    • This phenomenon is expected to be observable in other nonlinear systems exhibiting similar bifurcation structures.