Pseudo-spatial coherence resonance in an excitable laser with long delayed feedback

Area of Science:

• Nonlinear Dynamics and Optics
• Semiconductor Laser Physics
• Complex Systems

Background:

• Excitable semiconductor lasers with feedback exhibit complex spatio-temporal dynamics.
• Understanding the role of noise in such systems is crucial for controlling their behavior.

Purpose of the Study:

• To investigate the effect of noise on the spatio-temporal dynamics of an excitable semiconductor laser with feedback.
• To identify and characterize noise-induced phenomena, including 'pseudo-spatial coherence resonance'.

Main Methods:

• Analysis within the framework of spatio-temporal representation of long delayed systems.
• Development and application of a phenomenological model for system description.
• Introduction of a simple Monte Carlo approach for dynamical explanation.

Main Results:

• Observed propagation, noise-induced creation, and destruction of excitable pulses in pseudo time.
• Identified 'pseudo-spatial coherence resonance' upon addition of variable noise.
• Phenomenological and Monte Carlo models successfully described and explained experimental observations.

Conclusions:

• Noise plays a significant role in shaping the dynamics of excitable semiconductor lasers with feedback.
• Pseudo-spatial coherence resonance is a key noise-induced phenomenon in these systems.
• The employed models provide a robust framework for understanding the underlying physical mechanisms.