On the generation of high-quality Nyquist pulses in mode-locked fiber lasers

Abstract

Nyquist pulses have wide applications in many areas, from electronics to optics. Mode-locked lasers are ideal platform to generate such pulses. However, how to generate high-quality Nyquist pulses in mode-locked lasers remain elusive. We address this problem by managing different physical effects in mode-locked fiber lasers through extensive numerical simulations. We find that net dispersion, linear loss, gain and filter shaping can affect the quality of Nyquist pulses significantly. We also demonstrate that Nyquist pulses experiences similariton shaping due to the nonlinear attractor effect in the gain medium. Our work may contribute to the design of Nyquist pulse sources and enrich the understanding of pulse shaping dynamics in mode-locked lasers.

Dissipative soliton resonance within different dispersion regimes in a single mode-locked laser

“…[29] It is also widely employed in mode-locked lasers, encompassing pulse shaping through dispersion management, [30] pulse synchronization, [31] enhancement of optical nonlinear effects, [32] pure-quartic soliton lasing [33] and Nyquist pulse generation. [34][35][36][37][38] In this work, we propose a method to excite DSR in anomalous, normal and near-zero dispersion regimes in a single mode-locked laser, without changing the physical layout of the laser cavity. This is realized by employing a waveshaper such that the net dispersion of the laser can be readily varied using software.…”