[1] A. K. Memon, K. X. Chen. Recent advances in mode converters for a mode division multiplex transmission system. Opto-Electron. Rev., 29, 13(2021).

[2] M. Nakazawa. Exabit optical communication explored using 3M scheme. Jpn. J. Appl. Phys., 53, 08MA01(2014).

[3] R. I. Sabitu, N. G. Khan, A. Malekmohammadi. Recent progress in optical devices for mode division multiplex transmission system. Opto-Electron. Rev., 27, 252(2019).

[4] J. Du, W. Shen, J. Liu, Y. Chen, X. Chen, Z. He. Mode division multiplexing: from photonic integration to optical fiber transmission [Invited]. Chin. Opt. Lett., 19, 091301(2021).

[5] B. Ndagano, R. Brüning, M. McLaren, M. Duparré, A. Forbes. Fiber propagation of vector modes. Opt. Express, 23, 17330(2015).

[6] Q. Zhan. Trapping metallic Rayleigh particles with radial polarization. Opt. Express, 12, 3377(2004).

[7] D. P. Biss, T. G. Brown. Polarization-vortex-driven second-harmonic generation. Opt. Lett., 28, 923(2003).

[8] C. Min, Z. Shen, J. Shen, Y. Zhang, H. Fang, G. Yuan, L. Du, S. Zhu, T. Lei, X. Yuan. Focused plasmonic trapping of metallic particles. Nat. Commun., 4, 2891(2013).

[9] R. Drevinskas, J. Zhang, M. Beresna, M. Gecevičius, A. G. Kazanskii, Y. P. Svirko, P. G. Kazansky. Laser material processing with tightly focused cylindrical vector beams. Appl. Phys. Lett., 108, 221107(2016).

[10] S. Ge, P. Chen, Z. Shen, W. Sun, X. Wang, W. Hu, Y. Zhang, Y. Lu. Terahertz vortex beam generator based on a photopatterned large birefringence liquid crystal. Opt. Express, 25, 12349(2017).

[11] G. Machavariani, Y. Lumer, I. Moshe, A. Meir, S. Jackel. Spatially-variable retardation plate for efficient generation of radially- and azimuthally- polarized beams. Opt. Commun., 281, 732(2008).

[12] A. Arbabi, Y. Horie, M. Bagheri, A. Faraon. Dielectric metasurfaces for complete control of phase and polarization with subwavelength spatial resolution and high transmission. Nat. Nanotechnol., 10, 937(2015).

[13] H. Chen, J. Hao, B. Zhang, J. Xu, J. Ding, H. Wang. Generation of vector beam with space-variant distribution of both polarization and phase. Opt. Lett., 36, 3179(2011).

[14] G. Wang, Y. Li, X. Shan, Y. Miao, X. Gao. Hermite–Gaussian beams with sinusoidal vortex phase modulation. Chin. Opt. Lett., 18, 042601(2020).

[15] T. Grosjean, D. Courjon, M. Spajer. An all-fiber device for generating radially and other polarized light beams. Opt. Commun., 203, 1(2002).

[16] H. Wan, J. Wang, Z. Zhang, Y. Cai, B. Sun, L. Zhang. High efficiency mode-locked cylindrical vector beam fiber laser based on a mode selective coupler. Opt. Express, 25, 11444(2017).

[17] Y. Cai, J. Wang, J. Zhang, H. Wan, Z. Zhang, L. Zhang. Generation of cylindrical vector beams in a mode-locked fiber laser using a mode-selective coupler. Chin. Opt. Lett., 16, 010602(2018).

[18] S. Li, Q. Mo, X. Hu, C. Du, J. Wang. Controllable all-fiber orbital angular momentum mode converter. Opt. Lett., 40, 4376(2015).

[19] Y. Zhao, Y. Liu, C. Zhang, L. Zhang, G. Zheng, C. Mou, J. Wen, T. Wang. All-fiber mode converter based on long-period fiber gratings written in few-mode fiber. Opt. Lett., 42, 4708(2017).

[20] B. Y. Kim, H. E. Engan, H. J. Shaw, J. N. Blake. All-fiber acousto-optic frequency shifter. Opt. Lett., 11, 389(1986).

[21] W. Zhang, K. Wei, L. Huang, D. Mao, B. Jiang, F. Gao, G. Zhang, T. Mei, J. Zhao. Optical vortex generation with wavelength tunability based on an acoustically-induced fiber grating. Opt. Express, 24, 19278(2016).

[22] Q. Gao, Y. Du, Z. He, D. Mao, J. Zhao. Narrowband mode-locked fiber laser via spectral-domain intermodal interference. J. Lightwave Technol., 39, 6276(2021).