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Related Experiment Videos

Delay-induced resonances in an optical system with feedback.

J M Buldú1, J García-Ojalvo, M C Torrent

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 1, 2004
PubMed
Summary

This study reveals that semiconductor laser feedback systems exhibit enhanced responses to external periodic driving at specific delay times. These findings are crucial for understanding and controlling nonlinear optical systems.

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Area of Science:

  • Nonlinear Dynamics
  • Optoelectronics
  • Laser Physics

Background:

  • Semiconductor lasers with optical feedback exhibit complex dynamics, including the low-frequency fluctuation (LFF) regime.
  • Delayed feedback systems are sensitive to external periodic driving, influencing their response characteristics.
  • Understanding the interplay between feedback delay and external modulation is key to controlling laser output.

Purpose of the Study:

  • To investigate the influence of delay time on the response of a semiconductor laser with optical feedback to external periodic driving.
  • To numerically examine how varying external cavity length affects the system's behavior under weak harmonic modulation.
  • To determine the conditions under which the system's response is enhanced and how noise impacts this phenomenon.

Main Methods:

Related Experiment Videos

  • Numerical simulations of a semiconductor laser model with optical feedback.
  • Analysis of the low-frequency fluctuation (LFF) regime under harmonic pump current modulation.
  • Examination of the distribution of time intervals between power dropouts and their resonance with delay times.
  • Investigation of the system's response in the presence of additive noise.

Main Results:

  • Harmonic modulation partially entrains power dropouts in the LFF regime.
  • Resonances in the dropout time interval distribution indicate enhanced system response at specific delay times.
  • The external cavity length critically influences the system's response to modulation.
  • Stochastic resonance can be either enhanced or degraded by feedback delay time.

Conclusions:

  • Specific delay times significantly enhance the response of delayed feedback semiconductor lasers to external periodic driving.
  • The observed resonances provide a mechanism for controlling laser output through feedback delay.
  • Feedback delay time plays a dual role in stochastic resonance, highlighting its importance in noisy nonlinear systems.