Fig. 1: The principle of microsoliton stabilization and tuning by multiple global-frequency-tuning (GFT) methods.

a Schematic of a cavity with two dielectric blocks made of different materials. The frequency of a selected resonance could be fixed by simultaneously controlling the fraction of two blocks, while the free-spectral range of the cavity could be changed due to different effective dispersions for two blocks. b The cavity spectral shift under a single GFT. The frequency of the pump laser should follow the resonance shift or fluctuations to sustain a stabilized microsoliton. c The cavity spectra under multiple GFT methods. The pump resonance is self-adaptively stabilized while the FSR can be tuned independently. d The two-temperature model in a silica microrod cavity. When the cavity is excited by lasers through different spatial modes, the temperature shows distinct spatial distributions and thus induce different tuning effects to optical resonances, corresponding to the multiple GFT methods.