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针对微纳光纤布拉格光栅(MNFBG)在应用中存在的温度依赖问题,数值模拟了被不同折射率液体包围的MNFBG的反射波长与温度的关系,并且制作了可更换封装液体的MNFBG用于实验研究。通过使用蒸馏水和不同折射率的匹配液封装MNFBG,得到了MNFBG反射光谱及其中心波长随封装液体温度的变化规律。研究发现,在相同的温度变化过程中,不同性质的封装液体会影响MNFBG反射光谱的形状和移动方向,改变了普通光纤布拉格光栅(FBG)在温度升高过程中反射光谱形状几乎不变但其中心波长线性红移的特性。封装液体的折射率和热光系数越大,MNFBG反射波长随温度的变化越趋于非线性。换用折射率和热光系数分别为1.456和4×10~(-4)℃~(-1)的匹配液体后,MNFBG反射波长的温度灵敏度为-50.3pm/℃。MNFBG特性与环境液体、温度和FBG的尺寸有关,通过有效控制相关因素可以实现FBG在更多领域的功能化应用。
Aiming at the temperature dependence of MNFBG in applications, the relationship between the reflection wavelength of MNFBG surrounded by different refractive index liquids and temperature was numerically simulated and MNFBG, . The MNFBG reflectance spectra and the change of its center wavelength with the temperature of the encapsulating liquid were obtained by encapsulating MNFBG with distilled water and matched liquid of different refractive index. The results show that the encapsulation liquids with different properties will affect the shape and moving direction of the MNFBG reflection spectra at the same temperature change, and change the shape of the reflection spectrum of ordinary fiber Bragg grating (FBG) almost unchanged during the temperature increase. Center wavelength linear redshift characteristics. The larger the refractive index and thermal coefficient of the encapsulated liquid, the more the MNFBG reflected wavelength tends to be non-linear with temperature. After changing the matching liquid with refractive index and thermal coefficient of 1.456 and 4 × 10 -4 ℃ -1 respectively, the temperature sensitivity of MNFBG reflection wavelength was -50.3pm / ℃. The characteristics of MNFBG are related to the ambient liquid, temperature and the size of the FBG. Functional applications of FBG in more fields can be realized by effectively controlling the relevant factors.