Generation of Two Dissipative Soliton Resonance Pulses in an All-Anomalous-Dispersion Regime Thulium-Doped Fiber Laser

In this paper, we demonstrate experimentally a thulium-doped passively mode-locked figure-of-eight fiber laser to generate dissipative-soliton-resonance (DSR) pulses in an all-anomalous-dispersion regime. And two different DSR pulses are obtained by simply adjusting the polarization controllers. At maximum pump power of 2.4 W, the average power and repetition rate of two DSR pulses is 113.5 mW and 2.532 MHz respectively, corresponding to a pulse energy of 45 nJ. Subsequently, the effect of NALM length on the two DSR pulses is investigated, and pulses with maximum pulse energy of 63 nJ near 2 μm are obtained.