Figure illustrates a cross section of a photonic crystal fiber, polarization maintainer, included within the laser cavity. This inclusion is key, because it allows lowering the dispersion in the ytterbium emission wavelength.

We investigated the dissipative solitons resonance in an ytterbium-doped fiber ring laser in which all the elements are polarization maintaining. A semiconductor saturable absorber mirror was used as a mode-locker. As the absolute value of the net-normal dispersion increases, a square-shaped single light pulse transformed to a single right-angle trapezoid-shaped light pulse, and, at the dispersion further increases, to multiple right-angle trapezoid-shaped light pulses, per round-trip.

I. Armas-Rivera, C. Cuadrado-Laborde, A. Carrascosa, E. A. Kuzin, A. Díez, and M. V. Andrés, “Dissipative soliton resonance in a full polarization-maintaining fiber ring laser at different values of dispersion,” Optics Express 24 (2016) 9966-9974.