Period Doubling of Dissipative-Soliton-Resonance Pulses in Passively Mode-Locked Fiber Lasers

Wenxiong Du,Chen Wei,Yong Liu,Yanjia Lyu,Heping Li

doi:10.3389/fphy.2019.00253

Abstract

Period-doubled dissipative-soliton-resonance (DSR) pulses are numerically investigated in a Yb-doped fiber laser based on nonlinear amplifying loop mirror (NALM). In the case of low pump power, stationary dissipative solitons with uniform pulse peak power are obtained in the laser. Further increasing the pump power, the laser operates in the DSR regime, where the phenomenon of period-doubling bifurcations could occur. In a period-doubled state, the pulse peak power returns back to its original one every two cavity roundtrips while the pulse duration remains almost the same. We analyze the effects of cavity parameters on the DSR-pulse features under the dynamic bifurcations. It is found that the saturation power of NALM plays a dominant role in the formation of period-doubled DSR pulses. Our simulation results are conducive to enriching the dynamics of DSR pulses in nonlinear systems.

Highlights

Mode-locked fiber lasers, as an alternative ultrashort-pulse source, are highly promising for practical usages in material processing, non-linear optics, and optical sensing
In 2019, Wang et al reported the unusual evolution of dissipative soliton resonance (DSR) pulses in an all-normal dispersion (ANDi) figure-of-eight fiber laser, where the shrinkage of pulse duration with the pump power was observed for the first time [30]
We numerically investigate period-doubled DSR pulses in an ANDi Yb-doped fiber laser with non-linear amplifying loop mirror (NALM)

Summary

INTRODUCTION

Mode-locked fiber lasers, as an alternative ultrashort-pulse source, are highly promising for practical usages in material processing, non-linear optics, and optical sensing. Since several works have shown the generation of multiple DSR pulses in mode-locked fiber lasers with different dispersion regimes [26,27,28,29]. In 2019, Wang et al reported the unusual evolution of DSR pulses in an ANDi figure-of-eight fiber laser, where the shrinkage of pulse duration with the pump power was observed for the first time [30]. We numerically investigate period-doubled DSR pulses in an ANDi Yb-doped fiber laser with non-linear amplifying loop mirror (NALM). Period-doubling bifurcations of DSR pulses could be formed in the cavity with further increasing the pump power In this case, the pulse peak power becomes no longer uniform but alternates between two values. An initial weak pulse could converge into a steady state with proper cavity parameter settings

SIMULATION RESULTS AND DISCUSSION

CONCLUSION

DATA AVAILABILITY STATEMENT