Fig. 1. Schematic of OFC generation based on two cascaded PMs driven by asynchronous RF signal. (a) System structure; (b) subcarrier power transfer

Fig. 2. Contour map of relationship between modulation index and flatness

Fig. 3. Flatness versus frequency offset in zone B

Fig. 4. Spectra of OFC with comb spacing of 5.5 GHz. (a) 7 lines; (b) 9 lines; (c) 11 lines

Fig. 5. Spectra of OFC with comb spacing of 7.5 GHz. (a) 7 lines; (b) 9 lines; (c) 11 lines

Fig. 6. Power spectra of effective frequency component and interference frequency component for single comb line. (a) 55 kHz; (b) 75 kHz