Fig. 1. Bending loss of different core diameters

Fig. 2. Three step drawing of optical fiber. (a) Stack; (b) cane; (c) fiber

Fig. 3. Cross section of optical fiber. (a) SEM image of optical fiber; (b) wall thickness of cladding hole

Fig. 4. Loss of optical fiber measured at 266 nm. (a) Loss spectra; (b) bending loss spectra

Fig. 5. Loss of optical fiber measured at 355 nm. (a) Loss spectra; (b) bending loss spectra

Fig. 6. Simulation comparison of optical fibers with different structures. (a) Optical fiber structure (upper: real structure, lower: ideal structure); (b) loss comparison of two kinds of optical fibers; (c) simulation mode field diagram at 266 nm

Fig. 7. Simulation comparison of optical fibers with different wall thickness. (a) Optical fiber structure (upper: wall thickness d=300 nm, lower: wall thickness d=100 nm); (b) loss comparison of two kinds of optical fibers; (c) simulation mode field diagram at 266 nm