Synchronization of chaotic semiconductor laser systems: a vectorial coupling-dependent scenario.

Area of Science:

• Nonlinear dynamics
• Quantum optics
• Complex systems

Background:

• Complex systems often exhibit synchronization phenomena.
• Semiconductor lasers with delayed optical feedback are a key model for studying nonlinear dynamics.
• Vectorial coupling can introduce unique behaviors not seen in scalar coupling.

Purpose of the Study:

• To investigate the impact of vectorial coupling on the synchronization of two semiconductor lasers.
• To analyze how relative feedback phase influences synchronization dynamics.
• To understand the role of feedback phase in solitary delay systems.

Main Methods:

• Experimental setup with two unidirectionally coherently coupled semiconductor lasers.
• Application of delayed optical feedback to the laser system.
• Numerical simulations to complement experimental observations.
• Analysis of synchronization states under varying feedback phases.

Main Results:

• Demonstrated a characteristic synchronization scenario dependent on relative feedback phase.
• Observed cyclic transitions between chaos synchronization and uncorrelated states.
• Revealed the significant influence of feedback phase on system dynamics.
• Confirmed the role of vectorial coupling in modulating synchronization.

Conclusions:

• Vectorial coupling is a critical factor in determining synchronization patterns in complex systems.
• The feedback phase offers a controllable parameter to tune laser synchronization.
• Understanding these dynamics is crucial for applications in secure communications and optical computing.