Abstract
Abstract We numerically and experimentally investigate the multi-pulsing mechanism in a dispersion-managed mode-locked Yb-doped fiber laser. Multi-pulsing occurs primarily owing to the inherent filtering effect of the chirped fiber Bragg grating. The spectral filtering effect restricts the spectral broadening induced by self-phase modulation and causes extra loss, leading to a decreased pump power threshold for the multi-pulsing state. Numerical simulations show that multi-pulsing emerges at a lower pump power when the spectral filter bandwidth becomes narrower. In the experiment, the spectral width increases as the net cavity dispersion approaches zero. Pulses with wider spectral widths experience more loss from the spectral filtering effect, leading to a decreased pump power threshold for multi-pulsing. Therefore, the net cavity dispersion also has an impact on the multi-pulsing threshold. Based on this conclusion, we devise a strategy to obtain single-pulsing operation with the shortest pulse width and the highest pulse energy.
Highlights
Low-noise mode-locked lasers enable many applications such as precise frequency comb generation[1,2] optical communications[3], timing synchronization[4], and low-phasenoise microwave signal generation[5]
For a normal net cavity dispersion (NCD), the pulses are positively chirped along the cavity, and the selfphase modulation (SPM) leads to spectral broadening after the chirped fiber Bragg gratings (CFBGs) (Figure 5(c))
We experimentally demonstrate that the CFBGinduced spectral filtering effect can cause multi-pulsing in a DM mode-locked Yb-doped fiber (YDF) laser
Summary
Low-noise mode-locked lasers enable many applications such as precise frequency comb generation[1,2] optical communications[3], timing synchronization[4], and low-phasenoise microwave signal generation[5]. A recent theoretical study has investigated the spectral filtering effect on the multi-pulsing dynamics in DM fiber lasers. With an increased pump power, the spectral width increases to a critical point before the onset of multi-pulsing. The reflection bandwidth of the apodized CFBG is much narrower than the gain bandwidth of the YDF, leading to a strong spectral filtering effect. This CFBG-induced spectral filtering effect potentially causes multi-pulsing in DM mode-locked YDF lasers. We experimentally investigate the effect of spectral filtering on multi-pulsing in DM mode-locked fiber lasers. It is possible to further increase the single pulse energy by avoiding the strong spectral filtering effect
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
