Fig. 1. Working principle of multifunctional radar receiver scheme for parallel signal processing based on the FWM process.

Fig. 2. Experimental setup for multi-functional radar receiver based on photonic parametric sampling. LD: laser diode, MZM: Mach–Zehnder modulator, WDM: wavelength division multiplexer, VODL: variable optical delay line, EDFA: erbium-doped fiber amplifier, PC: polarization controller, MLL: mode-locked laser, OC: optical coupler, PCF: photonic crystal fiber, OBPF: optical band pass filter, PD: photodetector, OSC: oscilloscope, VNA: vector network analyzer. Inset I indicates the matched time delay of four channels.

Fig. 3. FWM wavelength conversion efficiency at different wavelengths when the wavelength of the pump signal is fixed at 1560 nm.

Fig. 4. Optical spectra of the photonic parametric sampling in the PCF for different-channel signals.

Fig. 5. Measured (symbols) and simulated (curves) beam-forming pattern of the four-channel phased array radar reception operating at the X band.

Fig. 6. Electric spectra of two received signals at X band and Ku band with 10 GSa/s sampling rate.