Fig. 5. Demonstration of singlet DKS frequency comb recovery against external perturbations.

a The left y-axis shows the laser power evolutions during DKS recovery against four externally enforced perturbation events. The right y-axis shows the wavelength shift of the auxiliary laser for regenerating the singlet soliton comb through spontaneous bursts and deterministic singlet formation. b Zoom-in dynamics for the example fourth perturbation and recovery event, and comb spectral snapshots before (left top) and after (left bottom) successful soliton recovery. The dashed gray lines in a and b indicate that the overall frequency comb power is precisely reset after each recovery event for the consistent low-noise singlet DKS comb state