Figure 6. Polarisation dynamics of bound state soliton in the form of superposition pfpolarisation switching between two SOPs of two interleaved BSs and SOP precession.

(a) Output optical spectrum indicates interleaved BSs with phase shifts of π/2 and π, 740 fs pulse width and 1.5 ps pulse separation; inset: pulse train of harmonically mode locked operation with period of 20 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.