Periodic soliton amplitude variation caused by unstable dispersive waves in a laser

A high-frequency periodic soliton amplitude variation is experimentally observed in a passively mode-locked soliton fiber laser when the modulation instability of the dispersive waves becomes obvious. This experimental result suggested that the influence of the dispersive waves on a soliton is non-negligible when the dispersive waves become unstable. Numerical simulation confirmed the experimental observation. Possible mechanism of soliton-unstable dispersive wave interaction in a laser was elaborated.