Fig. 1. Diagram of the TDS enhancement experimental setup based on the whispering-gallery mode microcavity

Fig. 2. Transmission spectra of the whispering gallery mode microcavity used and chaotic optical signal states before and after coupling with the whispering-gallery mode microcavity. (a) Transmission spectrum of the whispering gallery mode microcavity; (b) optical spectrum; (c) temporal waveform; (d) frequency spectrum

Fig. 3. Transmission spectra of the whispering gallery mode microcavity under different coupling states and their TDS enhancement effects. (a1)(a2)(a3) Transmission spectrum, temporal waveform, and autocorrelation curve in the under-coupling state; (b1) (b2)(b3) transmission spectrum, temporal waveform, and autocorrelation curve in the critical-coupling state; (c1) (c2) (c3) transmission spectrum, temporal waveform, and autocorrelation curve in the over-coupling state

Fig. 4. TDS enhancement effect diagram under different coupling positions

Fig. 5. TDS enhancement effect of DFB laser output chaotic light under different feedback intensities. (a) TDS values before and after enhancement under different feedback intensities; (b) enhancement percentage achieved under different feedback intensities

Fig. 6. TDS enhancement effect obtained under different bandwidths. (a) TDS values before and after enhancement; (b) enhancement percentage