Fig. 1. Photon-assisted instantaneous frequency measurement system based on stimulated Brillouin scattering

Fig. 2. Schematic diagram of channelized spectrum

Fig. 3. SBS response of single frequency signal

Fig. 4. SBS response of multi-frequency signals

Fig. 5. Measurement results at a resolution of 0.1GHz

Fig. 6. Measurement results at a resolution of 0.01GHz

Fig. 7. Measured errors

Fig. 8. The influence of the bias point drift