Fig. 1. Schematic diagram of optical frequency comb generation system

Fig. 2. Function values of nth order (n=0,1,2,3) Bessel function of the first kind

Fig. 3. Schematic diagram of evolution process of DPMZM output spectrum. (a) Spectrum produced by MZM1 in upper arm; (b) spectrum produced by MZM2 in lower arm; (c) output spectrum of DPMZM

Fig. 4. Simulation diagram of proposed optical frequency comb generation scheme

Fig. 5. Layout parameters setting of simulation system

Fig. 6. Output spectra of DPMZM working alone

Fig. 7. Output spectra after DPMZM cascaded with DDMZM

Fig. 8. Output spectra of optical frequency combs with different frequencies. (a) 4 GHz; (b) 6 GHz; (c) 8 GHz; (d) 10 GHz