摘要
Recent researches have demonstrated that pulsed driving is an effective method to increase the temporal overlap between cavity soliton(CS)and pump field,thereby increasing the pump-to-comb conversion efficiency.The amplitude-modulated inhomogeneity of the background wave causes the solitons to drift toward edges of the driving pulse.To eliminate the mul-tiple temporal trapping positions,induced by the spontaneous symmetry breaking,we propose the chirped pulse driving for deterministic single soliton generation.We theoretically explain the physical mechanism of the chirp pulse driving,as the combination of amplitude and phase modulation.Our numerical simulations demonstrate the chirp is responsible for the single soliton generation.A detailed investigation for dynamics of CSs sustained by chirped pulses,shows the recovery of spontaneous symmetry breaking.In addition,the desynchronized chirped pulse driving is also considered here.Considering a weak chirp parameter,the desynchronization-dependent trapping position diagram is divided into multiple areas including two CSs,a single CS,two oscillating CSs,and no CS.With a sufficient chirp parameter considered,the trapping position curve becomes a monotonous function of the desynchronized drift velocity,which indicates deterministic single soliton generation.
基金
We acknowledge the support from the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2019WNLOKF005)
the Natural Science Foundation of Hubei Province(Nos.2019CFB598 and 2020CFB440)
the National Natural Science Foundation of China(Grant Nos.61605179 and 62005255)
the Fundamental Research Funds for the Central Universities,China University of Geosciences(Wuhan)(Nos.1910491B06,ZL201917,G1320311998,and 162301192695).
