Investigation of Nonlinear Effects in Optical Fibers
No Thumbnail Available
Date
2012-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Nonlinear e ects in optical ber occur either due to intensity dependence of refractive
index of the medium and the e ects are an important e ects originated due to anharmonic
motion of bound electrons under the in
uence of an applied eld. The purpose of this
thesis is to investigate nonlinearity due to higher order such as third and fth order
harmonic polarization. Another aim is to nd out frequency chirp due to nonlinear e ect
of self phase modulation. Finally, some parameters which are very important to plot the
gure for frequency chirp and nonlinear polarization have to be calculated. In order to
investigate nonlinearity in optical bers, we verify types of ber and its structure, loss
mechanism in bers, some properties of light wave when its propagate through the bers
like the relation between wave vector and frequency of the light, types of nonlinear e ects
and threshold values in which self phase modulation of nonlinear e ect, frequency chirp
and third order polarization. Generally we calculate third order nonlinear susceptibility
which is the proper substitution for other odd order nonlinear polarization
Description
Keywords
Optical Fibers