Fig. 1. Simulation results of different regions of fiber cross-section. (a) Division of the cross-sectional regions of HC-ARF;

Fig. 2. Relationship between the final depth of water immersion in HC-ARF and the initial air pressure

Fig. 3. Water immersion experiment and observation. (a) Schematic diagram of the water immersion experiment for HC-ARF; (b) photo of liquid with red ink entering a HC-ARF

Fig. 4. Relationship between the depth and time of liquid entering different samples

Fig. 5. Measured result, fitting curve, and simulation curve of the relationship between liquid immersion depth and time in S2 sample

Fig. 6. Measured result, fitting curve, and simulation curve of the relationship between liquid immersion depth and time in L1 sample

Fig. 7. Relationship diagrams between the situation of water reaching the fiber end face from each air hole of HC-ARF and time. (a) 0 s; (b) 12 s; (c) 18 s; (d) 23 s; (e) 24 s; (f) 25 s

Fig. 8. Schematic diagram of attenuation measurement process after water immersion

Fig. 9. Relationship between attenuation and truncated length in fibers. (a) Attenuation of L1 sample before and after water immersion; (b) attenuation of L2 sample before and after water immersion