Spectral pulsations of evolving soliton molecules in an anomalous dispersion fiber laser

Abstract

We investigate in detail the spectral pulsation of evolving soliton molecules in an anomalous dispersion fiber laser by utilizing the dispersive Fourier transform technique. The spectral pulsations of an evolving soliton molecule with different properties were achieved in our experiments, such as single-period and double-period pulsation. This type pulsation is characterized by the fact that the soliton molecules periodically experience oscillation in spectral profile and peak power due to the periodic vibration evolution of the internal pulses. However, the continuous weak energy exchange between the two solitons inside the soliton molecules results in an almost invariable pulse energy. In addition, analytical fitting models are given to further reveal the spectral pulsation phenomenon of the evolving soliton molecules. These experimental findings can shed some light on the dynamics of soliton molecules in fiber lasers.

Research on the influence of intra-cavity dispersion on pulse characteristics of a quartic soliton fiber laser

“…When the time profile and spectrum of the output pulse in the fiber laser resonator do not change with time, it indicates that the laser is in a stable state, which is the general operation state after the soliton is formed in the fiber laser. However, by properly adjusting the system parameters in the laser resonator, the output pulse can periodically change its spectral shape, intensity, and width, which is called soliton pulsation [40][41][42]. Our numerical simulation results show that quartic soliton pulsation can be observed by changing the intra-cavity net second-order dispersion.…”