Authors: Hao, TF; Tang, J; Shi, NN; Li, W; Zhu, NH; Li, M
OPTICS LETTERS
Volume: 44 Issue: 8 Pages: 1912-1915 Published: APR 15 2019 Language: English Document type: Article
DOI: 10.1364/OL.44.001912
Abstract:
Optoelectronic oscillators (OEOs) have been widely investigated to generate ultra-pure single-frequency microwave signals. Here, we propose and experimentally demonstrate a dual-chirp Fourier domain mode-locked (FDML) OEO to generate dual-chip microwave waveforms. In the proposed FDML OEO, a frequency-scanning dual-passband microwave photonics filter based on phase-modulation-to-intensity-modulation conversion using an optical notch filter and two laser diodes is incorporated into the OEO cavity. Fourier domain mode-locking operation is achieved by synchronizing the scanning period of the filter to the cavity round-trip time. Tunable dual-chirp microwave waveforms with a large time-bandwidth product are generated directly from the FDML OEO cavity in the experiment, which can be used in modern radar systems to improve its range-Doppler resolution. (C) 2019 Optical Society of America
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