Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 2, Pages 458-464Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3029275
Keywords
Optical pulses; Optical filters; Generators; Optical switches; Bandwidth; Optical modulation; Optical amplifiers; Linear frequency modulation; microwave photonics; dual-chirp signal
Funding
- National Key R&D Program of China [2018YFB2201803]
- National Natural Science Foundation of China [61901215]
- Jiangsu Natural Science Foundation [BK20190404]
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A photonic-assisted multi-functional radar waveform generator has been proposed and experimentally demonstrated for single-chirped, counter-chirped, and dual-band linear frequency-modulated (LFM) microwave waveforms generation. By adjusting the time length and bandwidth of the rectangular LFM pulse, it is possible to generate single-chirped, counter-chirped or dual-band LFM signals.
A photonic-assisted multi-functional radar waveform generator for single-chirped, counter-chirped, and dual-band linear frequency-modulated (LFM) microwave waveforms generation is proposed and experimentally demonstrated based on an optical frequency-stepped waveform (FSW) generator. The optical FSW generator is realized by an optical switch and an optical frequency shifting loop (OFSL). When an electrical rectangular LFM pulse is applied to the proposed signal generator, an optical frequency-stepped LFM signal would be generated. By carefully setting the time length and the bandwidth of the rectangular LFM pulse, we can achieve an optical linearly-chirped continuous wave. Optical frequency-time stitching is thus realized. Combining the optical linear-chirped signal with one or more optical wavelengths, and meticulously adjusting the value of the optical wavelengths, single-chirped, counter-chirped or dual-band LFM signals can be produced. An experiment is carried out. Single-chirped and counter-chirped LFM signals of 8-32 GHz over a time duration of 5 mu s, and dual-band LFM signals of 8-16 GHz & 15-23 GHz and 8-20 GHz & 20-32 GHz are generated. The ambiguity functions of the generated signals are investigated.
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