Soliton Self-Frequency Shift in Mode Locked Fiber Lasers

We propose and demonstrate the soliton evolution in a mode locked Er-doped fiber laser with intra-cavity soliton self-frequency shift by numerical simulation, and analyze the effects of different parameters including of pump strength, length of dispersion shift fiber (DSF), and modulation depth of saturable absorber in detail for the first time. The results show that once the stable output pulse is formed, the frequency shift amount would increase with increasing the pump strength or decreasing the length of DSF and the modulation depth.