微波食品加热
材料科学
频率梳
无线电频率
带宽(计算)
光学
边带
平坦度(宇宙学)
激光器
振荡(细胞信号)
光电子学
物理
电信
宇宙学
量子力学
生物
计算机科学
遗传学
作者
Teng Gao,Y. Zhang,Juncheng Li,Shouhai Li,Zhiyao Zhang,Shangjian Zhang,Yong Liu
标识
DOI:10.1016/j.optlastec.2023.110295
摘要
In this paper, a novel and simple generation scheme based on a directly modulated laser (DML) is proposed for tunable microwave frequency combs (MFCs). When the input modulated RF power is intentionally controlled to be sufficiently high to drive the DML into its nonlinear operating region periodically, relaxation oscillations will be excited in the same period. The modulated light from the DML is subsequently detected by a photodetector, and a special kind of microwave signal source can be optically produced and shows up in the form of MFC in the frequency domain. In the proof-of-concept experiment, tunable MFCs are demonstrated with the bandwidth of more than 25 GHz, the comb spacing of 0.5 ∼ 3 GHz, and the flatness of less than ± 2 dB with the frequency from 3 GHz to 18 GHz. The bandwidth of the generated MFC is in accordance with the relaxation oscillation frequency of the DML. The comb spacing is strictly equal to the frequency of the modulated RF signal and thus flexibly adjustable. The carrier-to-noise ratio can be up to 48 dB, and the single-sideband phase noise is measured to be lower than − 90 dBc/Hz@1 kHz for MFCs with comb spacings of 0.7 ∼ 3 GHz.
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