[1] Freckmann T, Essiambre R J, Winzer P J et al. Fiber capacity limits with optimized ring constellations[J]. IEEE Photonics Technology Letters, 21, 1496-1498(2009).
[2] Richardson D J, Fini J M, Nelson L E. Space-division multiplexing in optical fibres[J]. Nature Photonics, 7, 354-362(2013).
[5] Xu C L, Yan K, Gu C et al. All-fiber laser with flattop beam output using a few-mode fiber Bragg grating[J]. Optics Letters, 43, 1247-1250(2018).
[6] Sun B, Wang A T, Xu L X et al. Low-threshold single-wavelength all-fiber laser generating cylindrical vector beams using a few-mode fiber Bragg grating[J]. Optics Letters, 37, 464-466(2012).
[7] Ngcobo S, Litvin I, Burger L et al. A digital laser for on-demand laser modes[J]. Nature Communications, 4, 2289(2013).
[8] Wang N. Antonio-Lopez J E, Alvarado Zacarias J C, et al. Mode-selective fiber laser using a photonic lantern[C]∥ECOC 2016; 42nd European Conference on Optical Communication, September 18-22, 2016, Dusseldorf,, 1-3(2016).
[9] Yan T T, Jiang Y C, Li H S et al. Switchable dual-mode all-fiber laser by using LPG and FBG[C]∥2018 Asia Communications and Photonics Conference (ACP), October 26-29, 2018, Hangzhou, China., 1-2(2018).
[10] Wan H D, Wang J, Zhang Z X et al. Passively mode-locked ytterbium-doped fiber laser with cylindrical vector beam generation based on mode selective coupler[J]. Journal of Lightwave Technology, 36, 3403-3407(2018).
[12] Ren F, Yu J, Wang J. Spatial-mode switchable ring fiber laser based on low mode-crosstalk all-fiber mode MUX/DEMUX[J]. Optics & Laser Technology, 101, 21-24(2008).