We report an approach for generating an evenly spaced, flat, and spectrally broad optical frequency comb (OFC) by the exploitation of gain modulation experienced by a fourth-ordered periodic Gaussian pulse train. The spectrally flat OFC generator is realized by propagating the periodic optical pulse through high gain SOA. The spectrum flatness limits up to 10 dB for 102 frequency lines, which is improved by exploiting four-wave mixing in 1-m long highly nonlinear fiber. We report a 30-GHz frequency line spaced, 3.06-THz spectrally broad OFC with 2.6-dB maximum power deviation.

中文翻译：

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利用半导体光放大器中的增益调制现象产生光频梳

我们报告了一种通过利用四阶周期性高斯脉冲序列所经历的增益调制来生成均匀间隔、平坦且光谱宽的光频率梳 (OFC) 的方法。光谱平坦的 OFC 发生器是通过高增益 SOA 传播周期性光脉冲来实现的。102 条频率线的频谱平坦度限制高达 10 dB，这通过在 1 米长的高度非线性光纤中利用四波混频得到改善。我们报告了 30-GHz 频率线间隔、3.06-THz 频谱宽的 OFC，最大功率偏差为 2.6-dB。