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Transition from unidirectional to delayed bidirectional coupling in optically coupled semiconductor lasers.

Cristian Bonatto¹, Bryan Kelleher, Guillaume Huyet

¹Centre for Advanced Photonics and Process Analysis, Cork Institute of Technology, Bishopstown, Cork, Ireland.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 3, 2012

Summary

We studied how semiconductor lasers transition from unidirectional to delayed bidirectional coupling. Different damping levels create unique dynamics, revealing how delayed coupling influences laser behavior.

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Area of Science:

Nonlinear dynamics
Optoelectronics
Laser physics

Background:

Coupling semiconductor lasers is crucial for advanced optical systems.
Understanding delayed coupling effects is key to controlling laser dynamics.

Purpose of the Study:

Investigate the transition from unidirectional to delayed bidirectional coupling in semiconductor lasers.
Analyze how coupling strength and detuning affect the locking region.
Examine the impact of relaxation oscillation damping on system dynamics.

Main Methods:

Tuning coupling strength in one direction.
Analyzing the evolution of the locking region with detuning and coupling strength.
Simulating systems with underdamped and overdamped relaxation oscillations.

Main Results:

The locking region's evolution is dependent on detuning and coupling strength.
Qualitatively different dynamical scenarios emerge for underdamped versus overdamped relaxation oscillations.
Delayed bidirectional coupling introduces new dynamics distinct from unidirectional coupling.

Conclusions:

The transition to delayed bidirectional coupling in semiconductor lasers leads to complex dynamics.
System behavior is highly sensitive to the damping of relaxation oscillations.
Delayed coupling effects share similarities with delayed feedback configurations, offering insights for laser design.