Controlling the leader-laggard dynamics in delay-synchronized lasers

Area of Science:

• Nonlinear Dynamics
• Optoelectronics
• Complex Systems

Background:

• Semiconductor lasers exhibit complex collective dynamics when coupled.
• Lag synchronization, where one system leads another, is a known phenomenon in delay-coupled systems.
• Controlling synchronization dynamics is crucial for applications like secure communications.

Purpose of the Study:

• To experimentally investigate the collective dynamics of two delay-coupled semiconductor lasers.
• To explore the impact of coupling architecture on lag synchronization.
• To assess the potential for controlling leader-laggard roles in coupled laser systems.

Main Methods:

• Experimental setup with two mutually delay-coupled semiconductor lasers.
• Independent control of coupling strengths in each direction.
• Analysis of system dynamics under varying coupling architectures.
• Numerical simulations to explore network architecture effects.

Main Results:

• Demonstrated lag synchronization in delay-coupled semiconductor lasers.
• Showed that switching between unidirectional and bidirectional coupling alters leader-laggard roles.
• Numerical simulations confirmed that network architecture influences system dynamics.

Conclusions:

• The coupling architecture significantly impacts the synchronization behavior of delay-coupled lasers.
• Leader-laggard roles in lag synchronization can be actively controlled by modifying the coupling setup.
• Findings have implications for developing advanced bidirectional chaotic communication systems.