Fig. 1. Schematic of proposed LFM signals and de-chirp generation scheme

Fig. 2. Schematic of RPML

Fig. 3. Time-frequency characteristics of transmitting and receiving waves

Fig. 4. Output signal spectrum of DPMZM

Fig. 5. Parabolic signal

Fig. 6. ±4-order sideband

Fig. 7. Time domain diagram of LFM signal output by PD after 20 cycles

Fig. 8. LFM signal after 20 cycles. (a) Spectrum; (b) time-frequency diagram

Fig. 9. LFM signals with different center frequencies. (a) Spectrum; (b) time-frequency diagram

Fig. 10. Spectrum and time-frequency diagram of LFM signal after 30 cycles. (a) Spectrum; (b) time-frequency diagram

Fig. 11. Signal with time width of 20 ns. (a) Parabolic signal; (b) spectrum; (c) time-frequency diagram

Fig. 12. Signal with larger amplitude. (a) Parabolic signal; (b) spectrum; (c) time-frequency diagram

Fig. 13. Phase coded signal. (a) Parabolic signal; (b) spectrum; (c) time-frequency diagram

Fig. 14. Autocorrelation results of LFM. (a) After 20 cycles; (b) after 30 cycles

Fig. 15. Optical spectrum after phase modulation

Fig. 16. RF spectrum after beat frequency processing

Fig. 17. Single frequency signal obtained by de-chirping echo signal with different time delay

Fig. 18. LFM signal after 50 cycles. (a) Time domain diagram; (b) spectrum