Chaotic Characteristics Of Feedback Injection Dbr Er³⁺-doped Fiber Laser And Its Sensing Research

In recent years, fiber laser have became a hot spots in the related fields. Fiber laser as thelight source with rapid development in optical fiber sensing and communication systems hasmany advantages such as narrow line width, low cost, easy coupling, high sensitivity and soon. Er³⁺-doped fiber laser possess much merit involved high signal-to-noise, low thresholdand high efficiency. DBR fiber laser has broad prospects in the sensing field because of itsadvantages with easy coupling and adjustment. The chaotic characteristics of fiber laser has awide range of application in the chaotic secure communications, electronic countermeasures,laser ranging, optical fiber break detection and optical fiber sensor.We did some research on chaotic characteristics of feedback injection DBR Er³⁺-dopedfiber laser and its sensing applications. First, the basic principle of DBR Er³⁺-doped fiber laserhas been described. In addition, discussing the feedback of DBR Er³⁺-doped fiber laser, weanalyzed minutely the chaotic characteristics of laser output caused by feedback. Finally, wehad argumentations with applications of feedback injection DBR Er³⁺-doped fiber laser insensing field by two viewpoints.In this thesis, the basic principle and structure of DBR Er³⁺-doped fiber laser has beenintroduced. A theoretical model of DBR Er³⁺-doped fiber laser has been established and therate equations of laser have been solved by using the transfer matrix of fiber grating. We alsoanalyzed the basic structure of DBR Er³⁺-doped fiber and test its features.This thesis describes the main methods of chaos analysis and discusses the chaoticcharacteristics of DBR Er³⁺-doped fiber laser based on feedback. We analyzed three typicalforms of fiber laser by mainly using PSD estimate, the largest index of Lyapunov and phasespace as well as did experimental verification.We did some research on sensing applications of feedback injection DBR Er³⁺-dopedfiber laser. First we studied the sensing system based on feedback and found that we shouldincrease the signal amplitude in steady state output and augment frequency of signals inchaotic state output to make the sensor easy to demodulate. Second, we discussed the sensingsystem based on the characteristics of chaos which could demodulate as cross-correlation by using the lower correlation of chaotic laser, possessing broad prospects for development dueto advantages such as low cost, favorable operability and so on.