All-fiber-photonics-based ultralow-noise agile frequency synthesizer for X-band radars

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We propose and demonstrate an agile X-band signal synthesizer with ultralow phase noise based on all-fiber-photonic techniques for radar applications. It shows phase noise of −145 dBc∕Hz (−152 dBc∕Hz) at 10 kHz (100 kHz) offset frequency for 10 GHz carrier frequency with integrated RMS timing jitter between 7.6 and 9.1 fs (integration bandwidth: 10 Hz–10 MHz) for frequencies from 9 to 11 GHz. Its frequency switching time is evaluated to be 135 ns with a 135 pHz frequency tuning resolution. In addition, the X-band linear- frequency-modulated signal generated by the proposed synthesizer shows a good pulse compression ratio approximating the theoretical value. In addition to the ultrastable X-band signals, the proposed synthesizer can also provide 0–1 GHz ultralow-jitter clocks for analog-to-digital converters (ADC) and digital-to-analog converters (DAC) in radar systems and ultralow-jitter optical pulse trains for photonic ADC in photonic radar systems. The proposed X-band synthesizer shows great performance in phase stability, switching speed, and modulation capability with robustness and potential low cost, which is enabled by an all-fiber-photonics platform and can be a compelling technology suitable for future X-band radars.
Publisher
OPTICAL SOC AMER
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

PHASE NOISE; MICROWAVE; RESOLUTION; OFDM

Citation

PHOTONICS RESEARCH, v.6, no.1, pp.12 - 17

ISSN
2327-9125
DOI
10.1364/PRJ.6.000012
URI
http://hdl.handle.net/10203/238755
Appears in Collection
ME-Journal Papers(저널논문)
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