Liu Li, Zhang Xiupu, Xu Tiefeng, Dai Zhenxiang, Dai Shixun, Liu Taijun
Opt Lett. 2017 Mar 15;42(6):1173-1176. doi: 10.1364/OL.42.001173.
A simple and seamless broadband optical frequency comb (OFC) generator is proposed and experimentally demonstrated using a Fabry-Perot quantum dot mode-locked laser combined with a dual-driven LiNbO Mach-Zehnder modulator driven by a low-power radio frequency (RF) signal. It is experimentally demonstrated that the 10-dB seamless bandwidth of the OFC is 8.2 nm (1.02 THz), which has 62 and 40 comb lines for frequency intervals of 16.56 GHz and 24.84 GHz, respectively. The single-sideband phase noise is as low as -112 and -108 dBc/Hz at an offset of 10 kHz, respectively, for the photodetector-converted 16.56 and 24.84 GHz frequency carriers. Correspondingly, the RF linewidths of the 16.56 GHz and 24.84 GHz carriers are about 251 Hz-263 Hz, respectively. Using a QD laser, an ultra-low phase noise and quasi-tunable broadband OFC generator is obtained easily.
提出了一种简单且无缝的宽带光学频率梳（OFC）发生器，并通过将法布里-珀罗量子点锁模激光器与由低功率射频（RF）信号驱动的双驱动LiNbO马赫-曾德尔调制器相结合进行了实验验证。实验表明，该OFC的10 dB无缝带宽为8.2 nm（1.02 THz），对于16.56 GHz和24.84 GHz的频率间隔，分别有62条和40条梳状线。对于光电探测器转换后的16.56 GHz和24.84 GHz频率载波，单边带相位噪声在10 kHz偏移时分别低至-112和-108 dBc/Hz。相应地，16.56 GHz和24.84 GHz载波的RF线宽分别约为251 Hz - 263 Hz。使用量子点激光器，可以轻松获得超低相位噪声和准可调谐宽带OFC发生器。
