Investigation Of Nonlinear Effects In Optical Fibers

Nonlinear e ects in optical ber occur either due to intensity dependence of refractivernindex of the medium and the e ects are an important e ects originated due to anharmonicrnmotion of bound electrons under the inrnuence of an applied eld. The purpose of thisrnthesis is to investigate nonlinearity due to higher order such as third and fth orderrnharmonic polarization. Another aim is to nd out frequency chirp due to nonlinear e ectrnof self phase modulation. Finally, some parameters which are very important to plot thern gure for frequency chirp and nonlinear polarization have to be calculated. In order torninvestigate nonlinearity in optical bers, we verify types of ber and its structure, lossrnmechanism in bers, some properties of light wave when its propagate through the bersrnlike the relation between wave vector and frequency of the light, types of nonlinear e ectsrnand threshold values in which self phase modulation of nonlinear e ect, frequency chirprnand third order polarization. Generally we calculate third order nonlinear susceptibilityrnwhich is the proper substitution for other odd order nonlinear polarization

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