Fig. 1. Polarization multiplexing principle based on birefringence

Fig. 2. Lyot filter for all-fiber structure

Fig. 3. Experimental setup of single-cavity multi-comb fiber laser

Fig. 4. Output characteristics of wavelength multiplexing dual comb

Fig. 5. Output characteristics of polarization multiplexing dual comb

Fig. 6. Output characteristics of direction multiplexing dual comb

Fig. 7. Output characteristics of wavelength multiplexing and direction multiplexing tri-comb

Fig. 8. Output characteristics of polarization multiplexing and direction multiplexing tri-comb

Fig. 9. Output characteristics of quad-comb generation

Fig. 10. Experimental setup of tri-comb absolute distance measurement

Fig. 11. Results diagrams of tri-comb absolute distance