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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Bistable regimes in an optically injected mode-locked laser.

Tatiana Habruseva1, Stephen P Hegarty, Andrei G Vladimirov

  • 1Center of Advanced Photonics and Process Analysis, Cork Institute of Technology, Ireland. tatiana.gabruseva@gmail.com

Optics Express
|November 29, 2012
PubMed
Summary

We experimentally studied quantum-dot (QD) lasers under optical injection, observing multiple dynamic states and hysteresis. Hysteresis area varied with injection power, growing initially then diminishing at high levels.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Laser Dynamics
  • Quantum Dot Physics

Background:

  • Quantum-dot (QD) lasers are crucial for optoelectronic applications.
  • Understanding their dynamics under external stimuli is key for device optimization.
  • Mode-locked lasers offer unique temporal characteristics.

Purpose of the Study:

  • To experimentally investigate the dynamical states of QD passively mode-locked semiconductor lasers.
  • To analyze the influence of external optical injection on laser dynamics.
  • To characterize the behavior of hysteresis loops concerning injection power and detuning.

Main Methods:

  • Experimental setup utilizing quantum-dot passively mode-locked semiconductor lasers.
  • Application of external optical injection with controlled power and frequency.
  • Observation and analysis of laser dynamical states and bifurcation boundaries.
  • Measurement of hysteresis loop area as a function of optical injection parameters.

Main Results:

  • Multiple dynamical states were observed in QD lasers under optical injection.
  • Bifurcation boundaries were found to be dependent on the sign of detuning variation.
  • Hysteresis loop area increased monotonically with small optical injection powers.
  • Hysteresis saturated at moderate powers and decreased at high injection levels, eventually disappearing.

Conclusions:

  • The study reveals complex dynamics in QD lasers influenced by optical injection.
  • Detuning sign critically affects bifurcation boundaries, indicating nonlinear interactions.
  • Injection power modulates hysteresis, offering potential control over laser behavior.
  • High injection levels can suppress hysteresis, leading to simpler dynamical regimes.