Espalhamento de Raman em fibras ópticas: caracterização teórica e simulações.

Abstract

When exposed to strong electromagnetic fields, optical fibers present nonlinear behavior, which should be considered in the design of optical communication systems. One of these nonlinear effects in optical fibers is Raman scattering, which does not affect single channel systems significantly, but has great influence on multichannel systems. Such effect consists in a frequency shifting on the incident signal, resulted by interaction with molecules of silica, with loss of energy. Deteriorating characteristics of Raman scattering effect are represented by Raman crosstalk phenomenon. Moreover Raman scattering has an important application as broadband optical amplifier. This paper presents the fundamentals of Raman optical scattering, its applications in Raman amplifiers and Raman crosstalk effect. Simulation results showing optical signals power distribution in fibers with Raman scattering occurrence are presented, leading to the observation of the theoretical behavior studied.