Evolution Of Self-similar Pulse In Optic Fiber Amplifier

Self-similar parabolic pulse, which generated from optical fiber amplifier with normal group-velocity dispersion, has unique transmission characteristics, such as self-similarity in shape and resistance to optical wave breaking. In particular, the pulse’s features are independent of the initial pulse shape, and no energy losses. Moreover, its linear chirp makes one can obtain efficient and high-quality compressed pulses. So study of these pulses self-similarity has a wide-range application value and scientific significance on many research fields.In this dissertation, the main contents include three aspects as follows. First, according to the NLSE, a self-similar solution is got, and the analytical solution is in good agreement with the numerical simulation result. Second, the influences of TOD on the self-similar pulse are discussed. The results show that the evolution of the self-similar parabolic pulse will be similar without TOD in system of optic fiber amplifier. But when the TOD in the system can’t be ignored, the self-similar pulse will be breaking and the shape of pulse will be distorted. Finally, he influences of TOD and self-steepening on the self-similar pulse are discussed. We found the balance conditions between higher order dispersion and higher order nonlinear effect, which can make the evolution of the self-similar parabolic pulse well.Chapter1introduces the self-similar pulse’excellent characteristics, including self-similar pulse’s generating principle, their research states, their developing background and prospects. Chapter2shows the theory of purse propagating equation in optical fiber. Chapter3shows the transmission characteristics of self-similar pulse in optical fiber amplifiers. Chapter4studies the influence of TOD on the parabolic pulse. Chapter5studies the influence of TOD and self-steepening on the parabolic pulse. Chapter6includes the summary and expectation views.