Fig. 1. Structure diagram of MPF based on SBS effect with unipolar structure

Fig. 2. Filtered spectral analysis based on SBS effect

Fig. 3. Corresponding signal waveform diagram

Fig. 4. Spectrum of PM signal

Fig. 5. Relationship between signal frequency and output power

Fig. 6. Spectrum under different pump power

Fig. 7. Relationship between filter gain and pump power

Fig. 8. Relationship between OOBR and pump power

Fig. 9. Relation curve between output and input signal power of filter under different pump power