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提出了一种基于在折射率引导型光子晶体光纤(PCF)中填充高折射率温度系数液体的新型折射率型光纤温度传感器。通过建立理论模型,设定入射波长和材料参数及完美匹配层边界条件,采用全矢量有限元法对六角形结构排列的折射率引导型光子晶体光纤的温度特性进行了分析。研究表明,在空气孔中填充液体乙醇,PCF模场分布随着温度变化明显,其有效折射率和限制损耗都随着温度升高而减小。相同的孔间距,占空比越大,输入波长越长,有效折射率和限制损耗受温度影响越大。当波长为1500nm,山空比为0.7,温度从-20℃升至70℃时,限制损耗从3.5×102dB/m减小到22dB/m。
A new type of refractive index optical fiber temperature sensor based on liquid crystal with high refractive index and temperature coefficient is introduced in PCF (refractive index guided photonic crystal fiber). The temperature characteristics of the index-guided photonic crystal fiber array with hexagonal structure are analyzed by establishing the theoretical model, setting the incident wavelength and the material parameters and the perfect matching layer boundary conditions, and using full vector finite element method. The results show that the mode field distribution of PCF changes with temperature when the liquid ethanol is filled in the pores, and the effective refractive index and the limiting loss decrease with increasing temperature. The same hole spacing, the greater the duty cycle, the longer the input wavelength, the greater the effective refractive index and limiting loss affected by temperature. When the wavelength is 1500nm, the space-time ratio is 0.7 and the temperature rises from -20 ℃ to 70 ℃, the limiting loss decreases from 3.5 × 102dB / m to 22dB / m.