Chaotic Generation By Figure Of Eight Erbium-doped Fiber Laser With Nonlinear Optical Loop Mirror

Due to its natural wideband, randomness and anti-interference, chaos has been extensively researched and applied in the fields of secure communication, chaotic sensor and imaging encryption. The erbium-doped fiber lasers appear very attractive for light weight, cramped construction, high reliability, low threshold, high power, high signal-to-noise ratio, and excellent fiber compatibility. It will offer wideband and tuneable laser light sources with1550-nm. So the Erbium-doped fiber lasers become the ideal choice for the fibre-optical communication with high speed and large capacity. Meanwhile it offers ideal light sources to system testing and fibre optical sensors. Accordingly it is a potential application prospect to study the chaotic dynamics of erbium-doped fiber laser which can lay the good theoretical and experimental foundation for the optical communication, optical detection and medicinal field. In this dissertation, enclosing to the chaotic generation of figure-of-eight erbium-doped fiber laser composed of erbium-doped fiber ring and nonlinear optical loop mirror, the main works are summarized as follows:1. We make a comprehensive review and summarize to optical fiber laser present situation, features and the prospect of development. We explain development of chaos and present situation of chaotic generation in figure-of-eight erbium-doped fiber laser.2. We analyze operating principle of nonlinear fiber ring laser mirror and the basic model of chaotic generation by nonlinear ring laser. The chaotic generation of figure-of-eight erbium-doped fiber laser composed of nonlinear fiber ring mirror and erbium-doped fiber ring are studied theoretically. Meanwhile we make a numerical simulation for the chaotic generation from figure-of-eight erbium-doped fiber laser and demonstrate the chaotic dynamics behavior.3. We experimentally study the chaotic dynamic process using the figure-of-eight erbium-doped fiber laser with nonlinear optical loop mirror. The polarization controllers are fixed to an appropriate orientation, figure-of-eight erbium-doped fiber laser present the doubling-period route to chaotic state. The numerical simulation shows a good agreement with the experimental results. 4. In order to further study the chaotic behaviors, we add an optical fiber ring to the figure-of-eight erbium-doped fiber laser with nonlinear optical loop mirror. The optical fiber ring with a length of1.2m is composed of by connecting the output port to the input port of a2×250:50optical fiber coupler. We make the experimental study to the figure-of-eight erbium-doped fiber laser with optical fiber ring which can show the doubling-period route to chaotic state and discuss the chaotic characters。...