Li Hao, Wei Yongfeng, Ji Yushuang, Li Xiang. Generation and Dechirping of Linear Frequency Modulation Signals[J]. Laser & Optoelectronics Progress, 2021, 58(3): 3060031
- Laser & Optoelectronics Progress
- Vol. 58, Issue 3, 3060031 (2021)
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
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Table 1. Effect of different parabolic signals on bandwidth, time-bandwidth product and chirp rate
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