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We propose and demonstrate a simple method to generate an all-fiber high-order transverse-mode switchable laser using a few-mode Bragg fiber grating (FM-FBG). The switchable output of the LP02 mode, LP11 mode, and LP01 modes is precisely realized by adjusting the operating wavelength in the cavity, which breaks through the limitation of only two low-order modes in most reports about all-fiber transverse-mode switchable lasers. The slope efficiencies for the three modes are 2.5%, 5.9%, and 9.3%, respectively. The central wavelengths of the lasers are 1530.2 nm, 1531.3 nm, and 1532.1 nm, respectively, and the corresponding side mode suppression ratios are -61 dB, -67 dB, and -65 dB, which ensures the purity of the modes. This work has huge potential applications in sensing, mode division multiplexing, optical communication, laser processing, and surface plasmon excitation.
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