Figure 4. Polarisation dynamics of bound state soliton in the form of polarisation switching between three SOPs.

(a) Output optical spectrum indicates π shift bound state with 370 fs pulse width and 1.5 ps pulse separation; inset: pulse train with period of 40 ns collected from four polarimeter photodetectors; (b) total optical power (red squares) and DOP (black circles); (d) Stokes parameters on the Poincaré sphere. Each point in Fig. (b)–(d) corresponds to a single laser pulse.