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Related Experiment Videos

Saddle-node ghost-induced low-frequency fluctuations in an external-cavity laser diode.

F Rogister1, P Mégret, M Blondel

  • 1Service d'Electromagnétisme et de Télécommunications, Faculté Polytechnique de Mons, Boulevard Dolez 31, 7000 Mons, Belgium. rogister@telecom.fpms.ac.be

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 15, 2003
PubMed
Summary

We numerically investigated low-frequency fluctuations in laser diodes with optical feedback. Our findings show that a saddle-node ghost bifurcation can cause this behavior.

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Area of Science:

  • Physics
  • Nonlinear Dynamics
  • Optical Engineering

Background:

  • Laser diodes are fundamental optoelectronic devices.
  • Optical feedback can destabilize laser diode operation, leading to complex dynamics.
  • Understanding these dynamics is crucial for device stability and applications.

Purpose of the Study:

  • To numerically investigate the low-frequency fluctuation (LFF) regime in a laser diode subjected to optical feedback.
  • To identify the underlying mechanism responsible for the onset of the LFF regime.

Main Methods:

  • Numerical simulations of a standard delayed differential equation model for a semiconductor laser with optical feedback.
  • Bifurcation analysis to identify critical parameter values and dynamical regimes.
  • Phase space analysis to characterize the system's behavior.

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Main Results:

  • The study successfully reproduced the low-frequency fluctuation regime in the numerical model.
  • A saddle-node ghost bifurcation was identified as the key mechanism inducing the LFF regime.
  • The simulations revealed distinct signatures of the saddle-node ghost in the system's dynamics.

Conclusions:

  • The saddle-node ghost bifurcation provides a robust explanation for the low-frequency fluctuation regime in laser diodes with optical feedback.
  • This finding contributes to a deeper understanding of nonlinear dynamics in semiconductor lasers.
  • The results have implications for designing more stable laser diode systems and controlling their output characteristics.