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Crowd synchrony and quorum sensing in delay-coupled lasers.

Jordi Zamora-Munt1, C Masoller, Jordi Garcia-Ojalvo

  • 1Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Edifici GAIA, Terrassa, Barcelona, Spain.

Physical Review Letters
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Delayed coupling in semiconductor lasers can still achieve zero-lag synchronization, even with nonidentical lasers. Researchers explored how delay affects synchronization transitions, revealing switchable dynamics.

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Area of Science:

  • Nonlinear Dynamics and Chaos
  • Optoelectronics and Photonics
  • Complex Systems

Background:

  • Crowd synchrony and quorum sensing emerge from large-scale communication via a common information pool.
  • Instantaneous coupling typically leads to synchronization in such systems when the element count is sufficiently large.
  • The impact of delayed information transmission on synchronization in coupled dynamical systems remains an area of active research.

Purpose of the Study:

  • To investigate synchronization phenomena in a system of semiconductor lasers with delayed optical coupling to a central laser.
  • To determine if zero-lag synchronization can occur despite nonidentical laser frequencies and delayed coupling.
  • To analyze the influence of delay-coupling parameters on the transitions between different synchronization states.

Main Methods:

  • Modeling a system of semiconductor lasers coupled optically to a central laser.
  • Introducing a time delay in the information transmission pathway between the coupled lasers and the central pool.
  • Analyzing the synchronization behavior and transition dynamics by varying system and delay-coupling parameters.

Main Results:

  • Zero-lag synchronization was observed even when the semiconductor lasers possessed distinct optical frequencies.
  • The system demonstrated the ability to switch between two distinct types of synchronization transitions.
  • A detailed study of the dependence of these transitions on delay and coupling parameters was conducted.

Conclusions:

  • Delayed coupling does not preclude the emergence of zero-lag synchronization in systems of nonidentical semiconductor lasers.
  • The delay parameter plays a crucial role in controlling the nature of synchronization transitions.
  • This research provides insights into the complex dynamics of coupled optoelectronic systems with delayed interactions.