Coupling feedback phase-shift controlling chaos for dual-ring erbium-doped fiber laser

Method of chaos control by coupling-feedback phase-shift and its physical model are presented for dual-ring single-mode erbium-doped fiber lasers. The coupler feeds the output back with phase-shift controller controlling the phase of feedback, and selecting apt feedback coefficient, laser chaos can be controlled into stable state or periodic state in real-time, dynamically and effectively. The evolution of system’s output state is analyzed when the control coefficient is changed, and the output of the system can produce rich laser dynamics phenomena with certain regularity. Relationship between vibration period of the system and control variables is discussed when chaos is controlled into single periodic state.