Abstract: Theoretical analysis of multimode fiber temperature sensor with wavelength calibration function based on broadband light source interrogation is given. It is pointed out that the characteristic wavelength position corresponding to the dip in the spectrum is determined by the interference of multiple transmission modes excited in the multimode fiber and coupled to the lead-out single-mode fiber again; the characteristic wavelength is determined by the core diameter, length, core and cladding refractive index of the multimode fiber. The proposed theory is used to analyze and simulate the number of characteristic wavelengths appearing in the spectral range of the light source spectrum ASE, and the multimode fiber temperature sensor with only one characteristic wavelength is optimized and designed. Three multimode fiber temperature sensor heads with only one characteristic wavelength of approximately 4 cm, 5.5 cm and 10 cm in length are made, which are encapsulated by capillary glass tubes. The temperature measurement experiment is carried out by using a spectrum analyzer with a resolution of 0.01 nm. It is found that the linear relationship between temperature and characteristic wavelength drift is about 13 pm/℃. Keywords: fiber optics; fiber sensing; multimode fiber; temperature measurement; broadband light source
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