Fig. 1. Profile of optical fiber.(a) Structure of NANF; (b) simulation of electric field intensity contour

Fig. 2. Fundamental mode normalized electric field distributions and electric field variation curves along different directions of three types of optical fibers. (a) HCF; (b) ARF; (c) NANF

Fig. 3. Relationship between core fundamental mode loss and outer diameter of cladding capillary

Fig. 4. Relationship between fiber structure and normalized electric field intensity in tube gap.(a) Structure of HC-ARF; (b) inter-tube structure with g=-t; (c) relationship between normalized electric field intensity along solid line of Fig. (a) and d

Fig. 5. Relationship between core fundamental mode loss and core diameter

Fig. 6. Relationship between core fundamental mode loss and outer diameter of embedded casing

Fig. 7. Loss curves of two kinds of optical fibers and absorption curve of F300 type silica

Fig. 8. Performance curves of two polarization states of core fundamental mode and lowest loss higher order mode. (a) Relationship between real part of ffective refractive index and bending radius; (b) bending loss

Fig. 9. Electric field distribution at different bending radii. (a) 10 cm; (b) 19 cm

Fig. 10. Electric field distribution of HC-ARF and HC-NANF at different bending radii. (a) 15 cm; (b) 10 cm

Fig. 11. Relationship between total loss and material absorption of two kinds of fibers with different core diameters. (a) Wide range diagram; (b) enlarged view of dashed box of Fig. (a)