[1] Wang J. Twisted optical communications using orbital angular momentum[J]. Science China Physics, Mechanics & Astronomy, 62, 034201(2018).

[2] Allen L, Beijersbergen M W, Spreeuw R J C et al. Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes[J]. Physical Review A, 45, 8185-8189(1992).

[3] Yang W D, Qiu X D, Chen L X. Research progress in detection, imaging, sensing, and micromanipulation application of orbital angular momentum of beams[J]. Chinese Journal of Lasers, 47, 0500013(2020).

[4] Nan J H, Han Y P. Dual-channel multiband vortex optical communication[J]. Acta Optica Sinica, 41, 1206001(2021).

[5] Xiao Y Y, Tang Y, Zhu Z H. Few-mode fiber temperature sensors based on modal interference between orbital angular momentum modes[J]. Laser & Optoelectronics Progress, 58, 0906003(2021).

[6] Zhang H, Zhang X G, Li H et al. The orbital angular momentum modes supporting fibers based on the photonic crystal fiber structure[J]. Crystals, 7, 286(2017).

[7] Xu M N, Zhou G Y, Chen C et al. A novel micro-structured fiber for OAM mode and LP mode simultaneous transmission[J]. Journal of Optics, 47, 428-436(2018).

[8] Nandam A, Shin W. Spiral photonic crystal fiber structure for supporting orbital angular momentum modes[J]. Optik, 169, 361-367(2018).

[9] Liu E X, Tan W, Yan B et al. Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber[J]. Journal of Physics D, 52, 325110(2019).

[10] Wang W C, Wang N, Li K Y et al. A novel dual guided modes regions photonic crystal fiber with low crosstalk supporting 56 OAM modes and 4 LP modes[J]. Optical Fiber Technology, 57, 102213(2020).

[11] Zhang Z M, Liu X Y, Wei W et al. The simulation of vortex modes in twisted few-mode fiber with inverse-parabolic index profile[J]. IEEE Photonics Journal, 12, 7101908(2020).

[12] Kabir M A, Hassan M M, Ahmed K et al. Novel spider web photonic crystal fiber for robust mode transmission applications with supporting orbital angular momentum transmission property[J]. Optical and Quantum Electronics, 52, 1-17(2020).

[13] Jin X L, Wang Y W, Sun B et al. Annular and hollow-core photonic crystal fiber for propagation of multi-order vorticity[J]. Chinese Journal of Lasers, 48, 1105001(2021).

[14] Bozinovic N, Golowich S, Kristensen P et al. Control of orbital angular momentum of light with optical fibers[J]. Optics Letters, 37, 2451-2453(2012).

[15] Araki S, Suzuki K, Nishida S et al. Ultra-broadband tunable (0.67–2.57 µm) optical vortex parametric oscillator[J]. Japanese Journal of Applied Physics, 56, 102701(2017).

[16] Shen P C, Cao Q, Bai L H et al. Concise relation among the effective index of the TE01 mode of the metal rectangular waveguide and those of the TE1 and TM0 modes of the metal parallel-plate waveguide for terahertz waves[J]. Journal of the Optical Society of America B, 35, 1173(2018).

[17] Gulistan A, Ghosh S, Chugh S et al. Air-holes induced multimodal fiber design to increase the effective index difference between higher order guided modes[J]. Optical Fiber Technology, 53, 102023(2019).

[18] Qin Y, Jiang P, Yang H J et al. Broadband and low confinement loss photonic crystal fibers supporting 48 orbital angular momentum modes[J]. Proceedings of SPIE, 11052, 110520S(2019).

[19] Al-Zahrani F A, Hassan M M. Enhancement of OAM and LP modes based on double guided ring fiber for high capacity optical communication[J]. Alexandria Engineering Journal, 60, 5065-5076(2021).

[20] Rjeb A, Fathallah H, Machhout M. Numerical Investigation of orbital angular momentum mode purity in Inverse Parabolic Graded index fiber[C], 925-928(2020).

[21] Hu Z A, Huang Y Q, Luo A P et al. Photonic crystal fiber for supporting 26 orbital angular momentum modes[J]. Optics Express, 24, 17285-17291(2016).

[22] Xu X, Jia H Z, Lei Y et al. Theoretical proposal of a low-loss wide-bandwidth silicon photonic crystal fiber for supporting 30 orbital angular momentum modes[J]. PLoS One, 12, e0189660(2017).

[23] Ren W X, Gong Y D, Zhang Z et al. Optical OAM tweezer based on graded-index multimode fibers[J]. Applied Optics, 60, 7634-7639(2021).

[24] Zhang Y, Li Y, Zhang Y X et al. HACF-based optical tweezers available for living cells manipulating and sterile transporting[J]. Optics Communications, 427, 563-566(2018).

[25] Wong G K L, Kang M S, Lee H W et al. Excitation of orbital angular momentum resonances in helically twisted photonic crystal fiber[J]. Science, 337, 446-449(2012).

[26] Li X J, Pang F F, Liu H H et al. Excitation vector modes by applying stress on vortex fiber through an external 3D printed mechanical grating[J]. Optical Communication Technology, 42, 1-3(2018).

[27] Wang J, Wei J P, Yang B et al. Research progress of microstructured polymer optical fiber preparation method[J]. Journal of Functional Materials, 44, 171-175(2013).

[28] Pryamikov A D. Negative curvature hollow core fibers: design, fabrication, and applications[J]. Proceedings of SPIE, 8961, 89610I(2014).

[29] Bai F R. Study on large size cylinder by plasma solid outside deposition[D], 3-9(2017).

[30] Zheng X J, Ren G B, Huang L et al. Study on bending losses of few-mode optical fibers[J]. Acta Physica Sinica, 65, 064208(2016).

[31] Bhandari R. Analytic expressions for orbital angular momentum modal crosstalk in a slightly elliptical fiber[J]. IEEE Photonics Journal, 12, 7202621(2020).

[32] Wei W, Zhang Z M, Tang L Q et al. Transmission characteristics of vortex beams in a sixfold photonic quasi-crystal fiber[J]. Acta Physica Sinica, 68, 114209(2019).