Two Spot Coupled Ring Resonators

Nguyen Duy Cuong, Dinh Xuan Khoa, Cao Long Van, Le Canh Trung, Bui Dinh Thuan, Marek Trippenbach
Author affiliations


  • Nguyen Duy Cuong Vinh University
  • Dinh Xuan Khoa
  • Cao Long Van Institute of Physics, University of Zielona Gora Poland
  • Le Canh Trung
  • Bui Dinh Thuan
  • Marek Trippenbach



Bose Einstein condensates, nonlinear optical systems, ring resonators


Abstract. We consider a model of two coupled ring waveguides with constant linear gain and nonlinear absorption with space-dependent coupling. This system can be implemented in various physical situations as optical waveguides, atomic Bose-Einstein condensates, polarization condensates, etc. It is described by two coupled nonlinear Schrödinger equation. For numerical simulations, we take local two-gaussian coupling.

It is found in our previous papers that, depending on the values of involved parameters, we can obtain several interesting nonlinear phenomena, which include spontaneous symmetry breaking, modulational instability leading to generation of stable circular flows with various vorticities, stable inhomogeneous states with interesting structure of currents flowing between rings, as well as dynamical regimes having signatures of chaotic behavior.

This research will be associated with experimental investigation planned in Freie Universität Berlin, in the group of prof. Michael Giersig.


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How to Cite

N. D. Cuong, D. Xuan Khoa, C. Long Van, L. Canh Trung, B. Dinh Thuan and M. Trippenbach, Two Spot Coupled Ring Resonators, Comm. Phys. 29 (2019) 491. DOI:



Received 08-05-2019
Accepted 28-09-2019
Published 16-12-2019