Broadband high-resolution microwave frequency measurement based on photonic undersampling via using three cavity-less optical pulse sources with coprime repetition rates.
作者： Xuyan Zhang , Di Peng , Yangxue Ma , Botao Wang , Mengke Wang
DOI: 10.1364/AO.401483
关键词: Photonics 、 Nyquist frequency 、 Pulse (physics) 、 Microwave 、 Dynamic range 、 Pulse compression 、 Physics 、 Optics 、 Undersampling 、 Ultrashort pulse
摘要: A photonic-assisted broadband and high-resolution microwave frequency measurement scheme is proposed demonstrated based on undersampling via using three cavity-less optical pulse sources with coprime repetition rates. After by ultrashort trains rates in the order of gigahertz, input signal down-converted to intermediate-frequency (IF) signals located first Nyquist range. Through measuring frequencies IF fast Fourier transform after digitization commercially available analog-to-digital convertors, can be retrieved identification algorithm. In proof-of-concept experiment, 2.99, 3.07, 3.10 GHz are generated a source, where widths 9.5, 9.6, 9.8 ps, respectively. these trains, range up 40 realized, error less than ±5kHz, spurious-free dynamic 91.25dBcHz2/3.
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