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Effect of Intensity Dependent Dispersive Parameters on Pico Second Pulse Propagation in an Optical Fiber
Bhawna Kshirsagar and A.A. Koser

In modern optical fiber communication system dispersion is a very important factor that degrades the communication quality, especially group velocity dispersion (GVD) and third-order dispersion (TOD). This paper presents a comprehensive study on the pulse distortion due to intensity dependent dispersive parameters in an optical fiber. The impact of intensity dependent dispersive parameter on pico second optical pulse evolution in an optical fiber has been investigated using mathematical modeling. The pulse behavior is analyzed by incorporating Kerr non-linearity effect on group velocity dispersion (GVD) parameter β 2 and third-order dispersion (TOD) parameter β 3 . The complete study is done for different pulse width and different input intensities. Bloch equations are used to obtain polarization induced in the medium due to incident Gaussian pulse. The analysis of induced polarization is done by using non linear Schrodinger equation. Intensity dependent dispersive parameters result in broadening of pulse with an additional temporal shift on the propagating pulse due to intensity effect. The theoretical analysis and numerical simulation reveals that for high optical intensities, intensity dependent dispersive effects become more important.

Keywords: Group velocity dispersion, third-order dispersion, pico second pulse, pulse broadening, optical pulse propagation, third order optical susceptibility, intensity dependent refractive index, Kerr non linearity.