Modeling of Negative Influences at the Signal Transmission in the Optical Medium

1. Introduction Nowadays, an interest in the signal transmission through optical fibers rapidly increases due to the transmission bandwidth. The increasing of optical high-speed data rates in transmission systems leads to limitations caused by linear and nonlinear effects. Each nonlinear effect limits different part of optical signals (e.g. amplitude, phase, frequency and polarization). It is necessary to examine above all negative influences arising in the optical environment and their influences on different modulation techniques for achieving desired signal transmission parameters. The simulation gives transmission boundaries of advanced signal processing techniques for the considered optical system and allows comparing all the solutions before their deployments in real optical transmission paths. This paper presents features and ways for modeling of negative effects using MATLAB Simulation tools. First, the paper introduces detailed characteristics of nonlinear effectspresentedin the optical transmission medium. Also, created block schemes for particular nonlinear effects are prepared for including into the model of optical transmission paths. Then, the simulation of negative influences at the signal transmission is shown for the noncoherent OOK modulated signal via the environment of a standard single mode fiber.