Harmonic generation in BBO by femtosecond laser pulses is studied, taking into account both group velocity mismatch, lowest order group velocity dispersion (GVD) and second order GVD.

An existence of an region of anomalous group velocity dispersion (GVD) span near (550￣700) nm band was evidently indicated.

A novel second-harmonic generation scheme is proposed to compensate group velocity dispersion effects.

The combined effects of self-phase modulation, positive group-velocity dispersion and stimulated Raman scattering through 15ps 1.

Then the effects of higher-order group-velocity dispersion (GVD) on SC generation in different fibers are analyzed and contrasted in details through simulation.

Futher more, self-similar pulses which are generated in fiber amplifiers with positive group-velocity dispersion, have become popular owing its the most attractive characteristic which the spectrum of self-similar pulse can be widened with a strict linear chirp across the whole duration of the amplified pulse.

Under the combined effects of group-velocity dispersion and self-phase modulation,the step Fourier method can be used to simulate the propagation of initial chirped Gaussian pulses inside fiber.

The effect of group velocity dispersion (GVD) on the focus was discussed.

Structure dispersion is primary when wave of input optical pulse is close to verge outside the stop-band of Fiber Bragg Gratings, optical pulse can come into being Bragg solitons by a careful control of self-phase modulation (SPM), cross-phase modulation (XPM) and group velocity dispersion (GVD).