Numerical Simulation Of The Influence Polarization-Mode Dispersion On Soliton Transmission Systems

The soliton transmission system has great potential for providing high speed and long distance communication. It can improve the performance of optical fibers' communication system. Comparing with the conventional optical fiber communication system using linearity optics principle, the soliton transmission system has tremendous communication capacity. The capacity will enlarge 10 or even 100 times, its relay distance can reach several hundreds km. At the same time, PMD restrict the fiber transmission system's capacity. It has been an important fact that limit the high speed transmission system. While soliton can restrain pulse split and excess spread, so it is considered can counteract PMD effect at some degrees.This paper uses numerical simulations to calculate the Nonlinear Schro dinger Equations with the PMD effect. Using the Split-Step Fourier Method in our simulation, it mainly investigate the transmission properties of the Manakov-soliton in optical fibers with PMD. The self-trapping effect for a single pulse of Soliton has been discussed, which can prevent a soliton pulse with PMD from splitting. Then we take the pulse sequences into account, which is more significance in real transmission link, we discuss the interaction of two soliton pulses and the loss of Soliton energy.The results of numerical value research prove that, for the single pulse of soliton, without transmission lose consideration, the PMD effect will not only influence the soliton pulse broadening but also make the frequency disturbed and destroy the shape of the soliton. The PMD effect will enlarge as the GVD parameter increase. PMD also influence the threshold of soliton self-trapping effect. The threshold will enlarge as the PMD effect increase. There will produce notable self-trapping effect. The soliton robustness to PMD can be proved. Because of the random of PMD, the angle of Polarization has no effect on self-trapping. When take the pulse sequences into account, the two pulses have the opposite phase and different amplitude, they will form a quasiequidistant bound state. The soliton interference is almost completely suppressed. The PMD effect only make the solitons produce dispersive waves and bring timing jitters. The dispersive waves cause soliton transmission systems to lose energy. In real fiber communication systems, using polarization division multiplexing (PDM) and make solitons have different amplitude can improve the capability.