Abstract
We introduce a novel photonic-assisted ultrabroadband radio-frequency arbitrary waveform generation setup capable of high-speed phase and amplitude modulation of the individual arbitrary waveforms. The waveform generator is based on an optical interferometer, within which a high-resolution optical pulse shaper and integrated optic phase and intensity modulators are placed, followed by frequency-to-time mapping. The phase and amplitude of each ultrabroadband waveform within the generated sequence can be continuously tuned by adjusting the driving voltages applied to the phase and intensity modulator pair, hence overcoming the slow update speed of conventional spatial light modulator-based pulse shapers. Moreover, this data modulation is completely independent from and does not interfere with RF waveform design. Programmable ultrabroadband RF sequences, spanning more than 4.7 octaves from 2 to 52 GHz, are modulated with real-time data in up to 16 level, M-ary phase-shift keying and quadrature amplitude modulation formats.
Highlights
Generation of programmable microwave and millimeter-wave (MMW) waveforms with bandwidths over tens of gigahertz has many potential applications, from ultrahigh-speed wireless communication to high resolution ranging and electromagnetic imaging [1,2,3]
Among the many photonic-assisted RF generation techniques, photonic RF-arbitrary waveform generators (RF-AWG) based on optical pulse shaping and frequency-to-time mapping (FTM) have been the most developed [6,7,12,18,19]
We have introduced a novel photonic-assisted radio-frequency arbitrary waveform generation setup, capable of overlaying high-speed phase and amplitude modulation on repetitions of the generated RF arbitrary waveform
Summary
Generation of programmable microwave and millimeter-wave (MMW) waveforms with bandwidths over tens of gigahertz has many potential applications, from ultrahigh-speed wireless communication to high resolution ranging and electromagnetic imaging [1,2,3]. Our group has previously reported a technique that utilizes two optical pulse shapers and allows high-speed binary data modulation of photonic-assisted RF-AWG, with experimental demonstrations of their applications in highly-dispersive ultrabroadband RF channel sounding and high resolution RF ranging with extended non-ambiguous range [24,25,26]. The proposed setup is an extension of a recently-reported RF-AWG system based on an optical interferometer architecture, that is capable of generating programmable RF waveforms with high time-bandwidth product and widely tunable center frequency [19,26] This data modulation scheme is completely independent of the RF-AWG stage, allowing immediate incorporation of real-time data modulation on the generated RF waveforms. We report direct measurements of phase- and amplitude-modulated ultrabroadband waveform sequences with frequency content from ~2 GHz to ~52 GHz, spanning more than 4.7 octaves
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