Dissipative soliton with sidebands on spectrum in an all-fibre laser

Abstract

We experimentally observed a dissipative soliton (DS) in an all-fiber laser with large-normal dispersion. The nonlinear polarization rotation (NPR) technique was used as the mode locker. The DS exhibited obvious sidebands on the spectrum, a feature that is distinctly different to that of the common DS previously reported. The spectral bandwidth was 57.43 nm, and the pulse duration was 2.20 ps. Remarkably, in the whole mode-locked pump regime, the DS remained in the single pulse state without multipulse shaping. Moreover, the pulse was compressed to ~140 fs by a negative dispersion device outside the cavity, and the pulse peak power reached 3.79 KW. We assumed that the spectral sidebands originated from the combined action of the nonlinear phase chirp and NPR-induced transmittance modulation, which may help to keep the mode-locked pulse working in the single pulse state. This work could help us gain a deeper insight into the DS formed in the normal dispersion regime.

35 fs, all-polarization-maintaining MOPA laser system

“…Moreover, the development of techniques is always dependent on the availability and stability of the ultrashort optical pulse source. In recent decades, different techniques have been researched to enhance the stability of the pulse source, reduce the pulse duration and improve the pulse peak power [6][7][8][9][10]. As to the pulse oscillator, different kinds of saturable absorber (SA) devices have been investigated, such as carbon nanotubes, graphene and topological insulator [11][12][13][14][15].…”