FURTHER INVESTIGATIONS FOR OPTICAL KERR EFFECTS USING SPLIT STEP FOURIER METHOD FOR SELF PHASE MODULATION AND DISPERSION

摘要

In this paper, we use one of the most accurate method, the split-step numerical method(SSFM) to solve the Schrodinger wave equation and analyze dispersion and self phase modulation effects. SPM process produces new frequency components as the pulse propagates through the fiber. The new frequency components are positive and linear frequency chirp. In the anomalous regime chromatic dispersion produces negative frequency chirp and it tends to negate the positive chirp induced by SPM. Consequently, interacting between SPM and dispersion results in the reduction of the pulse broadening. On the other hand, in the normal dispersion region, chromatic dispersion also generates positive linear frequency chirp. Therefore, the effect of the pulse broadening is much more accelerated since the pulse has been spread out by both of SPM and dispersion.