Broadband high-resolution microwave frequency measurement based on photonic undersampling via using three cavity-less optical pulse sources with coprime repetition rates.
Broadband high-resolution microwave frequency measurement based on photonic undersampling via using three cavity-less optical pulse sources with coprime repetition rates.
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DOI：
10.1364/ao.401483
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发表时间：
2020-09
期刊：
影响因子：
1.9
通讯作者：
Xuyan Zhang;Di Peng;Yangxue Ma;Botao Wang;Mengke Wang;Zhengkai Li;Zhiyao Zhang;Shang-jian Zhang;Heping Li;Yong Liu
中科院分区：
文献类型：
--
作者：
Xuyan Zhang;Di Peng;Yangxue Ma;Botao Wang;Mengke Wang;Zhengkai Li;Zhiyao Zhang;Shang-jian Zhang;Heping Li;Yong Liu
提出了一种基于欠采样的光子辅助宽带高分辨率微波频率测量方案，该方案利用三个重复频率相同的无腔光脉冲源进行欠采样。经过三个重复频率为千兆赫兹的超短脉冲串的欠采样后，输入微波信号被下变频为位于第一奈奎斯特频率范围内的三个中频(IF)信号。通过商用模数转换器数字化后的快速傅立叶变换测量中频信号的频率，可以基于频率识别算法提取输入微波信号的频率。在概念验证实验中，利用无腔光学脉冲源产生了三个重复频率分别为2.99、3.07和3.10 GHz的超短脉冲序列，脉冲宽度分别为9.5、9.6和9.8ps。利用这三个超短光脉冲串实现了高达40 GHz的频率测量，频率测量误差小于±5 kHz，无杂散动态范围为91.25dBcHz2/3。
A photonic-assisted broadband and high-resolution microwave frequency measurement scheme is proposed and demonstrated based on undersampling via using three cavity-less optical pulse sources with coprime repetition rates. After undersampling by three ultrashort pulse trains with repetition rates in the order of gigahertz, input microwave signal is down-converted to three intermediate-frequency (IF) signals located in the first Nyquist frequency range. Through measuring the frequencies of the IF signals via fast Fourier transform after digitization by the commercially available analog-to-digital convertors, the input microwave signal frequency can be retrieved based on the frequency identification algorithm. In the proof-of-concept experiment, three ultrashort pulse trains with repetition rates of 2.99, 3.07, and 3.10 GHz are generated by a cavity-less optical pulse source, where the pulse widths are 9.5, 9.6, and 9.8 ps, respectively. Through using these three ultrashort optical pulse trains, a frequency measurement range up to 40 GHz is realized, where the frequency measurement error is less than ±5kHz, and the spurious-free dynamic range is 91.25dBcHz2/3.