The Study Of Chaos Phase Shift Feedback Controlling Means In Dual-ring Erbium-doped Fiber Laser

Due to its naturally wide bandwidth, randomness and anti-interference capability, chaos is widely researched for secured communication and anti-interference. Erbium-doped fiber laser has advantages of wide gain spectrum, low loss and high average power and belonging to eye-safe wavelength, it possesses great prospects in the fields of chaotic secure communication and chaotic ranging. The unpredictability of chaos has a certain influence on the stability of optical system, so the chaotic controlling research of this laser is the hot topic at present. This dissertation focuses on the study of the dual-ring erbium fiber laser chaos feedback phase-shift controlling methods. The specific contents are listed as follows:Firstly, the dynamic mode about the controlling method of dual-ring erbium optical fiber laser chaos phase shift is established. Based on the dynamic mode about dual-ring erbium optical fiber laser, the dynamic mode about dual-ring erbium optical fiber laser chaos phase shift can be established after combination of the chaos phase shift control method and chaos feedback control method.Secondly, the dynamic equation about the controlling method of dual-ring erbium optical fiber laser chaos phase shift is established and discussing the controlling principles of system output state as the change of the control parameters. Based on the dynamic equation about dual-ring erbium optical fiber laser, the dynamic equation about chaos phase shift control method is established by combining the dynamic mode about the controlling method of dual-ring erbium optical fiber laser chaos phase shift. Discussing in the whole domain of definition, the controlling effect of four control parameters and analyzing the controlling principles of system output state as the change of the control parameters.Lastly, using discrete components to design analog circuits for achieving its chaotic behavior. According to the dynamics equations of the system, after the corresponding coefficient transformation, obtaining homologous circuit design model and giving the circuit simulation By adjusting the variable resistor in the circuit, chaos can be controlled into different periodic orbits which is consistent with the dynamic characteristics of the dual-ring erbium-doped fiber laser.