Fig. 1. Relationship between dispersion parameter D_is and diameter D of MBR at 1550 nm

Fig. 2. Experimental setup based on ohmic thermal tuning OFC of microbubble cavity, and inset is micrograph of FTF and built-in Au microwire MBR coupling system

Fig. 3. Performance curves of built-in Au microwire MBR. (a) Normalized fine scanning transmission spectrum; (b) partial enlargement of Fig. (a)

Fig. 4. Broadband OFC generated by optical pumping, inset is broadband OFC with no Raman laser generation

Fig. 5. OFC tuning characteristics of built-in Au microwire MBR. (a) Optical comb lines corresponding to different currents and peak fitting of single comb line; (b) 2D contour of optical comb line; (c) optical comb lines at different current currents

Fig. 6. Wavelength shift Δλ with current I changing of comb mode. (a) Δλ fitting with I of comb mode 2, inset is Δλ fitting with I² of comb mode 2; (b) Δλ fitting with I of comb mode 3, inset is Δλ fitting with I² of comb mode 3