Saeed Olyaee - Shahid Rajaee Teacher Training University (SRTTU)
Ashkan Ghanbari - Shahid Rajaee University

In this work, we study the generation of ultrashort femtosecond laser pulses in photonic crystal fibers through the widely used symmetric split-step Fourier method (S-SSFM). The results are compared with the method of fourth-order Runge-Kutta method (RK۴) as the most recognized and powerful method in the analysis of the evolution of ultrashort femtosecond laser pulses. The results show that although S-SSFM is a widely used method, its accuracy decreases for the selected relatively large step sizes of ∆z in comparison with RK۴. In contrast, the accuracy of the mentioned methods becomes closer to each other by selecting relatively small step sizes of ∆z.

Ultrashort laser pulse, optical pulse, Runge-Kutta, split-step, photonic crystal fiber