Photonic Generation of Highly-Linear Ultra-Wideband Stepped-Frequency Microwave Signals With Up to 6·106 Time-Bandwidth Product

A photonic-based technique for the generation of highly-linear ultra-wideband stepped-frequency microwave signals with large time-bandwidth product is proposed and experimentally demonstrated. The double-gated recirculating frequency-shifting optical fiber loop enables the frequency of the generated...

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Veröffentlicht in:Journal of lightwave technology 2022-02, Vol.40 (4), p.1036-1042
Hauptverfasser: Lyu, Yujie, Li, Yihan, Yu, Chunlong, Yi, Li, Nagatsuma, Tadao, Zheng, Zheng
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Sprache:eng
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Zusammenfassung:A photonic-based technique for the generation of highly-linear ultra-wideband stepped-frequency microwave signals with large time-bandwidth product is proposed and experimentally demonstrated. The double-gated recirculating frequency-shifting optical fiber loop enables the frequency of the generated microwave signal to hop step-wisely at exact increment. The generation of signals with up to 20 GHz bandwidth and ∼300 μs temporal duration, corresponding to a time-bandwidth product of 6·10 6 , is achieved by the proof-of-concept system with electronics of only up to 80 MHz bandwidth. Nonlinearity of less than 10− 7 and high intra- and inter-period coherence are also experimentally validated. This work provides applications such as high resolution radar with a promising low-cost solution for generating large time-bandwidth product waveforms with frequency scalability and extreme linearity.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2021.3127949