Fig. 1. Schematic diagram of multi-frequency instantaneous signal detection scheme based on gradient optical frequency comb

Fig. 2. OFC power ratio Ri between two adjacent combs

Fig. 3. Spectrum diagram of each part of system

Fig. 4. Spectrum diagram of output of multi-frequency signal

Fig. 5. Measurement error

Fig. 6. Influence of signal duration on measurement error

Fig. 7. Influence of laser linewidth on demodulation signal power ratio

Fig. 8. Influence of FBG center frequency on measurement results. (a) OFC signal power ratio; (b) measurement error

Fig. 9. Influence of EAM bias voltage on measurement results. (a) Flatness of OFC signal; (b) measurement error

Fig. 10. [in Chinese]