W-band Photonic-based Integration of Sensing and Communication with Frequency-division Multiplexed Waveforms in Fiber-wireless Integrated Network

A millimeter-wave (MMW) integrated sensing and communication (ISAC) system based on photonics is proposed. Its structure is simple, and the optical fiber-wireless structure can perfectly adapt to the current centralized fiber-distributed communication network. In the proposed system, the linear frequency modulated (LFM) signal and subcarrier modulated (SCM) 16-quadrature amplitude modulation (QAM) signal are combined by frequency division multiplexing (FDM). In the experiment, we verify a photonic-based ISAC W-band fiber-wireless integration system at 96.5 GHz over 10-km fiber transmission. We achieve 48 Gbit/s in communication-only mode and 8 Gbit/s in ISAC mode when the sensing resolution is 2.75 cm. By means of external calibration, the distance error of the system is less than 1 cm.