Fig. 1. Experimental setup for HC-PBGF fiber cavity fabrication and splice loss measurement

Fig. 2. Schematic diagrams of arc fusion splicing. (a) SMF/SMF splicing (d_off =0 μm); (b) SMF/HC-PBGF splicing (d_off =30 μm)

Fig. 3. Visual images of the splices when the discharge intensity is 41.0 bit and the discharge time is 1100 ms. (a) d_off =0 μm; (b) d_off =30 μm

Fig. 4. Alignment efficiency varying with the gap

Fig. 5. Ratio between the transmission power after and before discharge varying with the discharge intensity at different discharge time. (a) 200 ms; (b) 250 ms; (c) 300 ms; (d) 350 ms

Fig. 6. Splicing loss varying with the discharge time at different discharge intensities. (a) 35.0 bit; (b) 30.0 bit; (c) 25.0 bit

Fig. 7. Optical microscopic image of the fusion joint of HC-800-02/780-HP when the discharge intensity is 30.0 bit and the discharge time is 200 ms