Fig. 1. GIMF's mode field matching. (a) Self-imaging effect of GIMF; (b) Mode field mismatch loss between the GIMF amplified mode field and HC-ARF

Fig. 2. Nested HC-ARF and fiber arrays fusion splice. (a) Nested HC-ARF end face structure diagram; (b) SMF-GIMF after fusion splice and fixed length cleave; (c) SMF-GIMF-(HC-ARF)-GIMF-SMF configuration and diagram of fusion splice point loss

Fig. 3. Influence of different fusion splice parameters on loss. (a) Influence of discharge time on fusion splice loss; (b) Influence of discharge intensity on fusion splice loss

Fig. 4. Result of fusion splice. (a) SMF-GIMF-(HC-ARF) after fusion splice; (b) HC-ARF end face after breaking the fusion splice point; (c) Side view of HC-ARF collapse; (d) End face of HC-ARF collapse; (e) Fiber protected by heat shrink tubing