Generation of optical frequency comb with large spectral lines by cascaded dual-parallel modulator and intensity modulators

An optical frequency comb (OFC) generator with large and flat spectral lines based on cascaded dual-parallel modulator and intensity modulators is proposed and experimentally demonstrated. By adjusting the power of the microwave signals and the direct current bias applied to the modulators, 50 spectral lines with the comb flatness 1.38 dB can be generated. And the bandwidth of the optical frequency comb is broadened based on carriers cancellation of the DPMZM. The scheme is relatively simple and valuable, and the generated spectrums can be used for high capacity optical transmission systems in the future.