[1] D M Spirit, A D Ellis, P E Barnsley. Optical time division multiplexing: systems and networks. IEEE Communications Magazine, 32, 56-62(1994).

[2] B Mukherjee. WDM optical communication networks: progress and challenges. IEEE Journal on Selected Areas in Communications, 18, 1810-1824(2000).

[3] R Essiambre, G Kramer, P J Winzer, et al. Capacity limits of optical fiber networks. Journal of Lightwave Technology, 28, 662-701(2010).

[4] S Li, J Wang. Multi-orbital-angular-momentum multi-ring fiber for high-density space-division multiplexing. IEEE Photonics Journal, 5, 7101007(2013).

[5] Jun Liu, Jian Wang. Research progress of optical signal processing with orbital angular moment. Journal on Communications, 42, 217-232(2021).

[6] Zhongyi Guo, Zhenzhen Pan, Chaofan Gong, et al. Research on router device of OAM optical communication. Journal on Communications, 41, 185-197(2020).

[7] Wei Zheng, Di Zhang, Hao Yuan, et al. High capacity optical information encryption technology based on OAM holography and frequency shift. Infrared and Laser Engineering, 52, 20230313(2023).

[8] Z Hu, X Zhang, L Hui, et al. The orbital angular momentum modes supporting fibers based on the photonic crystal fiber structure. Crystals, 7, 286-286(2017).

[9] M Kim, S Kim. Epsilon-near-zero photonic crystal fibers for a large mode separation of orbital angular momentum modes. Optik, 204, 164209(2020).

[10] P Russell. Photonic crystal fibers. Science, 299, 358-362(2003).

[11] J M Dudley, G Genty, S Coen. Supercontinuum generation in photonic crystal fiber. Reviews of Modern Physics, 78, 1135(2006).

[12] H Zhang, X Zhang, H Li, et al. A design strategy of the circular photonic crystal fiber supporting good quality orbital angular momentum mode transmission. Optics Communications, 397, 59-66(2017).

[13] X Bai, H Chen, H Yang, et al. Design of a circular photonic crystal fiber with square air-holes for orbital angular momentum modes transmission. Optik, 158, 1266-1274(2018).

[14] W Wang, N Wang, K Li, et al. A novel dual guided modes regions photonic crystal fiber with low crosstalk supporting 56 OAM modes and 4 LP modes. Optical Fiber Technology, 57, 1002213(2020).

[15] Lijuan Zhao, Lixing Yin, Zhiniu Xu. Design of transverse pressure sensor based on Brillouin dynamic grating. Infrared and Laser Engineering, 52, 20230137(2023).

[16] C Li, B Yan, J Liu. Refractive index sensing characteristics in a D-shaped photonic quasi-crystal fiber sensor based on surface plasmon resonance. Journal of the Optical Society of America A, 36, 1663(2019).

[17] H Pakarzadeh, V Sharif. Control of orbital angular momentum of light in optofluidic infiltrated circular photonic crystal fibers. Optics Communications, 438, 18-24(2019).

[18] B Rodenburg, M Lavery, M Malik, et al. Influence of atmospheric turbulence on states of light carrying orbital angular momentum. Optics Letters, 37, 3735-3737(2012).

[19] Q Liu, S Tai, W Lu, et al. Design of pure silica-based photonic crystal fiber for supporting 114 OAM modes transmission. Journal of Optics, 23, 095701(2021).

[20] E Liu, S Liang, J Liu. Double-cladding structure dependence of guiding characteristics in six-fold symmetric photonic quasi-crystal fiber. Superlattices and Microstructures, 130, 61-67(2019).

[21] Guanjun Wang, Xuxiang Tan, Zhibin Wang. Nonlinearity of dispersion characteristics of nano-core fiber based on selective filling method. Acta Photonica Sinica, 44, 100-105(2015).

[22] L Exian, T Wei, Y Bei, et al. Broadband ultra-flattened dispersion, ultra-low confinement loss and large effective mode area in an octagonal photonic quasi-crystal fiber. Journal of the Optical Society of America A, 35, 431-436(2018).

[23] L Zhao, H Zhao, Z Xu, et al. A design of novel photonic crystal fiber with low and flattened dispersion for supporting 84 orbital angular momentum modes. Communications in Theoretical Physics, 73, 085501(2021).

[24] J H Baek, D S Song, I K Hwang, et al. Transverse mode control by etch-depth tuning in 1120-nm GaInAs/GaAs photonic crystal vertical-cavity surface-emitting lasers. Optics Express, 12, 859-867(2004).

[25] Hamzaoui H Ei, Y Ouerdane, L Bigot, et al. Sol-gel derived ionic copper-doped microstructured optical fiber: a potential selective ultraviolet radiation dosimeter. Optics Express, 20, 29751-29760(2012).

[26] D Lorenc, M Aranvosiova, R Buczynski, et al. Nonlinear refractive index of multicomponent glasses designed for fabrication of photonic crystal fibers. Applied Physics B, 93, 531-538(2008).

[27] F Xian, A K Mairaj, D W Hewak, et al. Nonsilica glasses for holey fibers. Journal of Lightwave Technology, 23, 2046-2054(2005).

[28] M Ma, Y Lian. Numerical analysis of a photonic crystal fiber with elliptical air hole for supporting 80 orbital angular momentum modes. Optical Fiber Technology, 72, 102986(2022).

[29] M Kabir. A, Hassan M M, Hossain M N, et al. Design and performance evaluation of photonic crystal fibers of supporting orbital angular momentum states in optical transmission. Optics Communications, 467, 125731(2020).

[30] A Rjeb, H Fateallah, S Chebaane, et al. Design of novel circular lattice photonic crystal fiber suitable for transporting 48 OAM modes. Optoelectronics Letters, 17, 501-506(2021).

[31] L Zhang, Y Meng. Design and analysis of a photonic crystal fiber supporting stable transmission of 30 OAM modes. Optical Fiber Technology, 61, 102423(2021).

[32] M A Kabir, K Ahmed, M M Hassan, et al. Design a photonic crystal fiber of guiding terahertz orbital angular momentum beams in optical communication. Optics Communications, 475, 126192(2020).