Fig. 1. Schematic of generation and transmission of LFM signal

Fig. 2. Schematic of LFM signal generation

Fig. 3. Output spectra. (a) Frequency-sweeping lasers; (b) MZM at MITP

Fig. 4. LFM continuous wave. (a) Output signal electrical spectrum of PD; (b) time domain waveform of signal; (c) instantaneous frequency extracted by Hilbert transform; (d) auto-correlation curve of one periodic signal (illustration is the enlarged view of auto-correlation main lobe)

Fig. 5. Up-chirp LFM pulse signal. (a) Time domain waveform; (b) instantaneous frequency extracted by Hilbert transform

Fig. 6. Down-chirp LFM pulse signal. (a) Time domain waveform; (b) instantaneous frequency extracted by Hilbert transform

Fig. 7. Simulation results of optical fiber remote transmission with antenna extended. (a) Power of the generated LFM signal versus fiber length; (b) power difference between the proposed approach and the numerical calculation

Fig. 8. Simulation results of 40 km SMF transmission. (a) Electrical spectra; (b) waveform; (c) auto-correlation function (illustration is the enlarged view of auto-correlation main lobe)

Fig. 9. Simulation results with optical switch delay 450 ns. (a) Electrical spectrum of LFM pulse signal generated by the proposed scheme; (b) instantaneous frequency extracted by Hilbert transform

Fig. 10. Simulation results with optical switch delay 550 ns. (a) Electrical spectrum of LFM pulse signal generated by the proposed scheme; (b) instantaneous frequency extracted by Hilbert transform

Fig. 11. Analysis chart of influence of time delay error on LFM signal

Fig. 12. Simulation results with FBG extinction ratio of 30 dB. (a) Instantaneous frequency diagram; (b) electrical spectrum from PD

Fig. 13. Signal power and power difference versus extinction ratio of FBG

Fig. 14. Multi-target detection system of the pulse compression radar

Fig. 15. Detection resolution between two targets (A and B) and target C after matching filtering processing. (a) LFM signal with bandwidth of 16 GHz; (b) LFM signal with bandwidth of 6 GHz