In this paper, we propose a fiber Bragg grating (FBG) multiplexing method based on mode diversity, which achieves FBG multiplexed sensing by utilizing spatial mode dimensionality. The mode diversity FBG multiplexing system based on few mode fiber (FMF) circulator and photonic lantern is constructed, and the LP01 and LP11 temperature sensing multiplexing are experimentally verified. The results show that the proposed technique is capable of achieving multichannel high-resolution temperature measurements, with temperature resolutions better than 0.5 °C for both LP01 and LP11 spatial modes, and detection sensitivities of 15.8 pm/ °C and 16.2 pm/ °C, respectively.
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