Fig. 1. Schematic diagram of the all-fiber coherent beam combination system

Fig. 2. Diagram of CBC based on optical fiber coupler

Fig. 3. Schematic diagram of two-channel CBC based on fiber polarization beam combiner

Fig. 4. Diagram of the structure of photonic lantern and traditional lantern

Fig. 5. Coherent beam combination principal of photonic lantern

Fig. 6. Schematic diagram of 3×1 photonic lantern coherent combining

Fig. 7. Diagram of the structure and the results of kW photonic lantern system

Fig. 8. Structure and section diagram of 61-core photonic lantern

Fig. 9. Experimental structure diagram and results of 3×1 photonic lantern

Fig. 10. Schematic diagram of the structure of the coherent signal beam combiner based on taper technology

Fig. 11. Diagram of the experiment of coherent signal beam combiner and light spots before and after experiment

Fig. 12. Diagram of the 16 kW coherent beam combination system and the results

Fig. 13. Schematic diagram of the experimental structure of the two-channel Y-shaped coherent beam combination

Fig. 14. Schematic diagram of the beam combining structure of the 4-way beam combiner

Fig. 15. Photograph of the free-space beam combiner module based on self-imaging effect

Fig. 16. Cross section of a rectangular core fiber

Fig. 17. Diagram of structure and results of 2×2 incoherent signal combiner

Fig. 18. Schematic diagram of square fiber combiner

Fig. 19. Diagram of the function of the combining effects of NA with different fiber arrays

Fig. 20. Theoretical and experimental verification results of square fiber self-imaging effect

Fig. 21. Diagram of the beam combiner based on the square fiber， the input spots and combining result

Fig. 22. Cross section of a square core fiber