Fig. 1. Cross-sectional field distributions of micro-rod cavity. (a) n=1, m=l; (b) n=1, m=l-1; (c) n=2, m=l; (d) n=1, m=l-2

Fig. 2. Schematic of auxiliary laser heating method. (a) Auxiliary laser staying at blue-detuned region; (b) pump laser entering blue-detuned region; (c) pump laser staying at red-detuned region steadily

Fig. 3. Schematic of micro-rod cavity coupled with tapered fiber

Fig. 4. Fabrication of micro-rod cavity. (a) Schematic of experimental setup for fabricating micro-rod cavity; (b) photo of micro-rod cavity; (c) schematic of experimental setup for coupling and measurement

Fig. 5. Power transmission spectra under different laser powers. (a) 10.8 W; (b)11.2 W; (c)11.4 W; (d) 11.6 W; (e) resonance peak power transmission spectrum

Fig. 6. Power transmission spectra under different coupling distances. (a) 0; (b) 90 nm; (c) 180 nm; (d) 240 nm; (e) resonance peak power transmission spectrum

Fig. 7. Generation of solition. (a) Schematic of experimental setup; (b) pump laser coupling with auxiliary laser in opposite direction and entering micro-rod cavity

Fig. 8. Single soliton frequency comb spectra. (a) Before optimization; (b) after optimization