Fig. 1. Isolated anti-resonant core photonic band-gap fiber structure. (a) Hollow core microporous structure of IAC-PBF；(b) core structure of IAC-PBF

Fig. 2. Loss and mode field simulation results of IAC-PBF. (a) Losses under different core wall thicknesses; (b) mode field diameter

Fig. 3. Modes of IAC-PBF. (a) Fundamental mode; (b) surface mode in cladding wall; (c)(d)(e) surface modes in fiber core wall; (f) high-order mode in fiber core

Fig. 4. Mode coupling of IAC-PBF under different fiber core thicknesses

Fig. 5. Bending loss of IAC-PBF

Fig. 6. Structural diagrams of IAC-PBF cane and band-gap fiber. (a) Fiber cane; (b) band-gap fiber

Fig. 7. Comparison between actual fiber (small core image) and theoretical fiber (large core image)

Fig. 8. Measured loss spectrum and simulated mode field of IAC-PBF