Perturbation Algorithm For The Phase Of The Signal In Nonlinear Dispersion Fiber

The application of the technology of Wavelength division multiplexing (WDM) and erbium-doped fiber amplifier (EDFA) has greatly enhanced the transmission capacity of optical fiber communication systems.The bit-rate of single-wavelength-system has now reached as high as 40Gb/s, and the capacity of single-fiber is more than 10Tb/s. Along with the increase of the capacity and speed,the traditional modulation:intensity modulation-direct detection (IMDD) transmission can not meet system requirements.So,the phase modulation which can make full use of transmission bandwidth and increase transmission capacity has become a Research focus in optical communication. In order to study the evolution of the pulse in fiber in phase modulation systems,particularly the evolution of carrier's phase,we make an in-depth study on the solution of the transfer equations-nonlinear Schrodinger equation.Perturbation algorithm will be applied to the phase modulation system. Then we try to achieve the separation of signal amplitude and phase.The semi-analytical solution of the phase is presented, by which the phase transfer process is studied,including evolution of single pulse and distribution of phases of multipulses.And based on the phase distribution we make an analysis about the impact of various factors on the phase.The results can supply references to the analytical simulation of the high_power and large_capacity optical fiber transmission systems and optimization design of the phase modulation systems...