Photonics-assisted joint communication-radar system based on a QPSK-sliced linearly frequency-modulated signal

• DOI: 10.1364/ao.456287
• Publication Date: 2022-05-10T14:00:09Z
• Authors: Shi Wang; Dingding Liang; Yang Chen
• Keywords: Signal Processing (eess.SP); FOS: Electrical engineering, electronic engineering, information engineering; 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology; Electrical Engineering and Systems Science - Signal Processing

A photonics-assisted joint communication-radar system is proposed by introducing a quadrature phase-shift keying (QPSK)-sliced linearly frequency-modulated (LFM) signal. An LFM signal is carrier-suppressed single-sideband modulated onto the optical carrier in one dual-parallel Mach–Zehnder modulator (DPMZM) of a dual-polarization dual-parallel Mach–Zehnder modulator (DPol-DPMZM). The other DPMZM is biased as an IQ modulator to implement QPSK modulation on the optical carrier. The polarization orthogonal optical signals from the DPol-DPMZM are further combined and detected in a photodetector to generate the QPSK-sliced LFM signal. The QPSK-sliced LFM signal is used to realize efficient data transmission and high-performance radar functions including ranging and imaging. An experiment is performed. Radar range detection with an error of less than 4 cm, inverse synthetic aperture radar imaging with a resolution of

14.99

c m

×

3.25

c m

, and communication with a data rate of 105.26 or 210.52 Mbit/s are successfully verified.