Li Dan, Wu Shibao, Liu Yu, Guo Yifeng
Appl Opt. 2020 Mar 1;59(7):1916-1923. doi: 10.1364/AO.381880.
To generate a flat optical frequency comb (OFC), a new scheme based on a dual-parallel Mach-Zehnder modulator and a single recirculation frequency shift loop is proposed and analyzed. Compared with the traditional single loop recirculation frequency shift method, the quantity of comb lines is doubled, and the comb flatness is better when the number of cycles is the same. The theoretical analysis model is established, and the simulation results show that a 111-line OFC with frequency spacing of 10 GHz, flatness of 1.32 dB, and optical signal to noise ratio of 27.4 dB can be obtained by adopting the proposed scheme.
为了产生平坦的光学频率梳（OFC），提出并分析了一种基于双并行马赫曾德尔调制器和单个再循环频移环的新方案。与传统的单环再循环频移方法相比，梳状线数量翻倍，并且在循环次数相同时梳状平坦度更好。建立了理论分析模型，仿真结果表明，采用该方案可获得频率间隔为10 GHz、平坦度为1.32 dB、光信噪比为27.4 dB的111线OFC。
