[1] [1] SHAHA K S R, KHALEQUE A, HASAN I. Low loss double cladding nested hollow core anti-resonant fiber[J]. OSA Continuum, 2020, 3(9): 2512-2524.

[2] [2] SAKR H, HONG Y, BRADLEY T D, et al. Interband short reach data transmission in ultrawide bandwidth hollow core fiber[J]. Journal of Lightwave Technology, 2020, 38(1): 159-165.

[3] [3] WANG Y Y, WHEELER N V, COUNY F, et al. Low loss broadband transmission in hypocycloid-core Kagome hollow-core photonic crystal fiber[J]. Optics Letters, 2011, 36(5): 669-671.

[4] [4] URICH A, MAIER R R J, MANGAN B J, et al. Delivery of high energy Er: YAG pulsed laser light at 2.94 m through a silica hollow core photonic crystal fibre[J]. Optics Express, 2012, 20(6): 6677-6684.

[7] [7] ZHAO X, WU X, LAN X, et al. 5-tube hollow-core anti-resonant fiber with ultralow loss and single mode[J]. Optics Communications, 2021, 501: 127347.

[8] [8] HABIB M S, MARKOS C, AMEZCUA C R. Impact of cladding elements on the loss performance of hollow-core anti-resonant fibers[J]. Optics Express, 2021, 29(3): 3359-3374.

[9] [9] FITT A D, FURUSAWA K, MONRO T M, et al. The mathematical modeling of capillary drawing for holey fibre manufacture[J]. Journal of Engineering Mathematics, 2002, 43: 201-227.

[11] [11] JASION G T, SHRIMPTON J S, CHEN Y, et al. Microstructure element method (MSEM): viscous flow model for the virtual draw of microstructured optical fibers[J]. Optics Express, 2015, 23(1): 312-329.

[12] [12] JASION G T, HAYES J R, WHEELER N V, et al. Fabrication of tubular anti-resonant hollow core fibers: modelling, draw dynamics and process optimization[J]. Optics Express, 2019, 27(15): 20567-20582.

[13] [13] BI X L, HEMING C, ZHANG L F. Circular photonic crystal fiber supporting orbital angular momentum modes transmission[J]. Infrared and Laser Engineering, 2019, 48(2): 222002-222008.

[15] [15] SCHERMER R T, COLE J H. Improved bend loss formula verified for optical fiber by simulation and experiment[J]. IEEE Journal of Quantum Electronics, 2007, 43(10): 899-909.

[16] [16] WANG Z, YE J, ZHAO C L, et al. Design of large-mode-area single-mode optical fiber with lowing bending loss for Raman distributed temperature sensor[J]. Optical Fiber Technology, 2013, 19(6): 671-676.

[17] [17] WEI C, WEIBLEN R J, MENYUK C R, et al. Negative curvature fibers[J]. Advances in Optics and Photonics, 2017, 9(3): 504-561.

[18] [18] BRADLEY T D, HAYES J R, CHEN Y, et al. Record low-loss 1.3 dB/km data transmitting antiresonant hollow core fibre[C]//2018 European Conference on Optical Communication (ECOC), Roma, Italy: IEEE, 2018: 1-3.

[19] [19] POLETTI F. Nested antiresonant nodeless hollow core fiber[J]. Optics Express, 2014, 22(20): 23807-23828.

[20] [20] BUFETOV I A, KOSOLAPOV A F, PRYAMIKOV A D, et al. Revolver hollow core optical fibers[J]. Fibers, 2018, 6(2): 39.

[21] [21] URBAIN G, BOTTINGA Y, RICHET P. Viscosity of liquid silica, silicates and alumin-silicates[J]. Geochimica et Cosmochimica Acta, 1982, 46(6): 1061-1072.