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Square-wave self-modulation in diode lasers with polarization-rotated optical feedback.

Athanasios Gavrielides1, Thomas Erneux, David W Sukow

  • 1Air Force Research Laboratory, Directed Energy Directorate AFRL/DELO, Kirtland AFB, New Mexico 87117, USA.

Optics Letters
|June 14, 2006
PubMed
Summary

Researchers studied edge-emitting diode lasers with delayed, polarization-rotated optical feedback. They observed square-wave oscillations in antiphase, resulting from a bifurcation phenomenon under specific feedback conditions.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Nonlinear Dynamics

Background:

  • Edge-emitting diode lasers are crucial optoelectronic devices.
  • Optical feedback can induce complex dynamics in lasers.
  • Polarization dynamics in lasers are sensitive to external perturbations.

Purpose of the Study:

  • To investigate the square-wave response of diode lasers under delayed polarization-rotated optical feedback.
  • To understand the conditions leading to self-modulated polarization oscillations.
  • To analyze the underlying physical mechanisms, including bifurcation phenomena.

Main Methods:

  • Experimental observation of laser output.
  • Numerical simulations of laser rate equations.
  • Analytical investigation of laser dynamics.

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Main Results:

  • Observed square-wave self-modulated polarization intensities oscillating in antiphase.
  • Identified that oscillations occur for strong feedback and low differential losses in the unsupported mode.
  • Demonstrated that these oscillations arise from a bifurcation phenomenon.

Conclusions:

  • Delayed polarization-rotated optical feedback can induce robust square-wave oscillations in diode lasers.
  • The observed dynamics are a result of a bifurcation mechanism.
  • The findings provide insights into controlling laser polarization dynamics.