Manipulating coherence resonance in a quantum dot semiconductor laser via electrical pumping

Area of Science:

• Nonlinear dynamics
• Semiconductor laser physics
• Quantum optics

Background:

• Excitability and coherence resonance are key phenomena in nonlinear systems.
• Semiconductor quantum dot lasers are promising for optoelectronic applications.
• Optical self-feedback influences laser dynamics.

Purpose of the Study:

• Investigate excitability and coherence resonance in semiconductor quantum dot lasers.
• Analyze the impact of short optical self-feedback on laser dynamics.
• Explore the role of pump levels and bifurcations in excitable regimes.

Main Methods:

• Numerical simulations of semiconductor quantum dot laser dynamics.
• Analysis of phase space and bifurcation analysis.
• Examination of system response to varying pump current and noise levels.

Main Results:

• Excitability observed near homoclinic bifurcation at low pump levels.
• A novel excitable regime identified near a boundary crisis of a chaotic attractor at high pump levels.
• The crisis-induced excitable regime shows high sensitivity to pump current.
• Excitability threshold increases with pump current, allowing adjustment of noise sensitivity and optimal noise strength for coherence resonance.

Conclusions:

• Semiconductor quantum dot lasers exhibit distinct excitable dynamics depending on pump levels.
• The pump current offers a tunable parameter to control noise sensitivity and optimize coherence resonance.
• Findings facilitate experimental realization of controllable excitable dynamics in quantum dot lasers.