Fig. 1. Schematic diagram of FMCW laser light source

Fig. 2. The main part of electro-optical phase-locked loop （Corresponding to the FPGA module in Fig.1， the purple line segment represents the pre-correction branch， and the red line segment represents the phase-locked loop branch）

Fig. 3. Timing diagram of DPD and TDC

Fig. 4. Diagram of FMCW laser ranging system

Fig. 5. Spectrum comparison of beat signal under 70 GHz frequency excursion

Fig. 6. Experimental results of STFT before and after correction

Fig. 7. Experimental results of linearized DFB frequency sweeps and residual errors.

Fig. 8. Spectrum comparison of beat signal under 90 GHz frequency excursion

Fig. 9. Experimental results of STFT before and after correction

Fig. 10. Experimental results of linearized DFB frequency sweeps and residual errors

Fig. 11. Experimental testing platform

Fig. 12. The results of single point FMCW laser ranging

Fig. 13. Comparison of FMCW ranging resolutions at different distance measurement