Application Research And Simulation Analysis Of Signal Transfer Characteristics In Optical Fibers

Transmission medium includes single-mode fiber and multimode fiber in Current optical communication systems, optical fiber dispersion, losses and the chirp parameters affect transfer characteristics, reduce communication capacity. Single-mode fiber is used for long distance transmissions, the transfer characteristics of single-mode fiber are analyzed by using step Fourier method for solving nonlinear Schrodinger equation, thus obtains the expression, While multimode fiber generally used for short distance transmissions, multimode fiber analyzes method is based on the power flow equation analysis of time domain, digital signal detuning of some improvement on the method is approximate get power transfer function. Although this method can describe multimode fiber in digital signal transmissions, but considering the analog signal transmissions or need baseband and RF transfer function will be limited to study and analysis of signal transfer characteristics, a new method based on electric field propagation model, this paper is try to study this method.This thesis is mainly study in three aspects:firstly, for multimode fiber, the power flow equation and the electric field propagation model of two kinds of methods, then carries on the theory analysis and simulation, simulation results show that the electric field propagation model is better than the power flow equation, more comprehensive study of optical fiber transfer characteristics secondly, for single-mode fiber, step Fourier method for solving nonlinear Schrodinger equation, considering the influence of the second and third-order dispersion, and then the simulation analysis, thirdly is the application research, analyses and compares the optical frequency division multiplexing (OFDM) and the mode group diversity multiplexing (MGDM) technology, elaborate on the basic principle and analyzes the advantages and disadvantages, and then through the opticsimu software to simulated the G.652 optical fiber transmission system, and obtain some meaningful results.