Fig. 1. Fabrication of a MWCNT-coated microcavity. (a) Fabrication process. (b) Image of a microcavity coated without MWCNT. (c) Image of a microcavity coated with MWCNT. (d) Q-factor measurement of a microcavity without MWCNT coating. (e) Q-factor measurement of a microcavity with MWCNT coating.

Fig. 2. Experimental setup for all-optical tuning based on a MWCNT-coated microcavity. FPC, fiber polarization controller; PD, photodetector; OSC, oscilloscope; OSA, optical spectrum analyzer.

Fig. 3. Resonance changes of a MWCNT-coated microcavity under all-optical tuning. (a) Microcavity resonant peak at 0 mW modulation laser power. (b) Resonance changes of the microcavity at different modulation laser powers.

Fig. 4. Resonance wavelength variation with modulation laser power.

Fig. 5. Response time of all-optical tuning based on a MWCNT-coated microcavity. (a) Microcavity response speed when the 980 nm modulation laser is turned on. (b) Microcavity response speed when the 980 nm modulation laser is turned off.

Fig. 6. Emission spectra of a MWCNT-coated microcavity under different powers of the 980 nm modulation laser, with power values shown in the upper right corner. (a)–(f) Intracavity spectra as the 980 nm modulation laser power is gradually reduced. (f) Single soliton state comb. (g)–(h) Intracavity spectra as the 980 nm modulation laser power is increased.