No abstract

A new approach to generate high-quality optical frequency comb (OFC) with good flatness, high bandwidth, and tunable frequency spacing is proposed. The OFC generator includes a polarization modulator and an intensity modulator (IMS), and the polarization modulator is modulated by a radio frequency multiplication circuit. The theoretical analysis model of the proposed scheme is established. The experiment stimulation results show that 35-line OFC with tunable frequency spacing and spectrum flatness of 0.3 dB and side-mode suppression ratio of 15.53 dB is gotten easily by adjusting the amplitude and frequency of the RF and the direct current bias voltage of the modulators. The stimulation results are in good agreement with the theoretical model.