Fig. 1. Process of noise suppression based on gain-saturated SOA

Fig. 2. Comparison of simulation signals before and after SOA. (a) Normalized signal; (b) noise

Fig. 3. Schematic of experimental setup

Fig. 4. Relationship between input/output optical power and drive current of SOA

Fig. 5. Measurement results of OEO with/without gain-saturated SOA. (a) Spectra when SPAN is 500 kHz; (b) waveforms of modulated optical signals in time domain

Fig. 6. Phase noise characteristics of OEO mixing with MCO

Fig. 7. Comparison of phase noises of OEO with SOA and without SOA