Extended Data Fig. 3: Long-term soliton stabilization via AlN feedback actuation.
From: Monolithic piezoelectric control of soliton microcombs

a, Experimental set-up. OSC, oscilloscope; BPF, bandpass filter; FBG, fibre Bragg grating. b, Soliton stabilization over 5 h, realized by locking the resonance to the laser and maintaining the soliton detuning. Three selected comb lines that exist for more than 5 h are shown here.