Coexistence of dissipative soliton and stretched pulse in dual-wavelength mode-locked Tm-doped fiber laser with strong third-order dispersion.

Yazhou Wang,Gaoyuan Li,Xiaojun Zhou,Lujun Hong,Jianfeng Li,Fei Liu,Yong Liu

doi:10.1364/oe.26.018190

Abstract

Mode-locked lasers with strong high order dispersion exhibit rich nonlinear dynamics. Here we numerically and experimentally demonstrate coexistence of dissipative soliton (DS) and stretched pulse (SP) in a dual-wavelength mode-locked Tm-doped fiber laser with strong third-order dispersion (TOD), where the DS and SP show completely different pulse duration and peak power. Wavelength-dependent feature of the net cavity group-velocity dispersion (GVD) leaded by the strong TOD plays a key role for the coexistence patterns. To our best knowledge, this is the first demonstration of the coexistence of different mode-locked pulse regimes with strong laser cavity TOD.

Highlights

Group-velocity dispersion (GVD) in passively mode-locked fiber laser plays a key role for pulse regimes
Conventional soliton (CS) and dissipative soliton (DS) will be respectively formed at large anomalous and normal net cavity groupvelocity dispersion (GVD) regions, where the former is dominated by the balance of nonlinearity and anomalous GVD [1], but the latter mainly depends on the interplay of nonlinear gain and loss [2]
Since the GVD and third-order dispersion (TOD) of the fiber laser play a key role in our experiment, we measure them with interferometric method [24]

Summary

Introduction

Group-velocity dispersion (GVD) in passively mode-locked fiber laser plays a key role for pulse regimes. Dissipative soliton resonance with feature of wave-breaking free can be formed by properly setting the net cavity dispersion [7] In these pulse regimes, the GVD is usually treated as wavelength insensitive due to their weak TOD and narrow spectrum range, and as a result the study of strong TOD on mode-locked pulse behavior is rarely reported. L. Wang has demonstrated the coexistence of bright pulses and dark solitons in an Er-doped mode-locked fiber laser with large normal GVD [16]. Liu has demonstrated the coexistence of strong and weak pulses in large anomalous GVD region at 1.5 μm band [17] These reports reveal such appealing coexistence patterns through designing suitable net cavity GVD, further exploring of complex coexistence patterns based on strong TOD even higher order dispersion is still unexplored as we best known. The performance of the coexistence patterns is investigated in detail

Experiment setup and mechanism

Simulation modeling

Simulation results

Experiment results and comparisons

Findings

Conclusion