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A photonics-assisted joint communication-radar system is proposed andexperimentally demonstrated, by introducing a quadrature phase-shift keying(QPSK)-sliced linearly frequency-modulated (LFM) signal. An LFM signal iscarrier-suppressed single-sideband modulated onto the optical carrier in onedual-parallel Mach-Zehnder modulator (DPMZM) of a dual-polarizationdual-parallel Mach-Zehnder modulator (DPol-DPMZM). The other DPMZM of theDPol-DPMZM is biased as an IQ modulator to implement QPSK modulation on theoptical carrier. The polarization orthogonal optical signals from theDPol-DPMZM are further combined and detected in a photodetector to generate theQPSK-sliced LFM signal, which is used to realize efficient data transmissionand high-performance radar functions including ranging and imaging. Anexperiment is carried out. Radar range detection with an error of less than 4cm, ISAR imaging with a resolution of 14.99 cm*3.25 cm, and communication witha data rate of 105.26 Mbit/s are successfully verified.

Photonics-Assisted Joint Communication-Radar System Based on a QPSK-Sliced Linearly Frequency-Modulated Signal