We propose a scheme of optical frequency comb (OFC) generation based on cascaded Mach–Zehnder modulator (MZM) and electroabsorption modulator (EAM) with Gaussian-shaped pulse signal. In the proposed scheme, the MZM and the nonzero-chirp EAM are driven by a periodic Gaussian-shaped pulse signal that is controlled with binary sequences, and then an OFC is output from EAM. The theoretical model of the OFC generation is developed by improving the theory of electroabsorption modulation. The performance of OFC is investigated. The results show that the frequency spacing of the OFC can be tuned in the range of 1 to 10 GHz, the number of effective comb-lines is 35, and the power variation of comb-lines is 2.14 dB.

中文翻译：

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基于带高斯形脉冲信号的级联MZM-EAM的光频率梳

我们提出了一种基于高斯形脉冲信号的级联Mach-Zehnder调制器（MZM）和电吸收调制器（EAM）的光频率梳（OFC）生成方案。在提出的方案中，MZM和非零线性调频EAM由周期高斯形脉冲信号驱动，该脉冲信号由二进制序列控制，然后从EAM输出OFC。通过改进电吸收调制理论，建立了OFC生成的理论模型。研究了OFC的性能。结果表明，OFC的频率间隔可以在1至10 GHz的范围内进行调整，有效梳状线的数量为35，梳状线的功率变化为2.14 dB。