Comparative study of soliton complexes in different laser configurations

We investigate the formation of self-organized and disorganized soliton structures in passively mode-locked Er:Yb doped double-clad fiber laser. Two laser configurations are studied. The first one is based on mode-locking through nonlinear polarization rotation while the second geometry is a figure-eight cavity in which the mode-locking is obtained with a nonlinear optical loop mirror. Although the physical mechanisms of mode-locking are different, we demonstrate that collective behaviours and soliton complexes are similar in both configurations. That demonstrates the universality of the solitonic structures.