液体环境中微纳光纤布拉格光栅的温度特性

发布时间：2018-04-05 23:21

  本文选题：光纤光学　切入点：微纳光纤布拉格光栅　出处：《激光与光电子学进展》2017年04期

【摘要】：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。
[Abstract]:Aiming at the problem of temperature dependence in the application of micro-nano fiber Bragg grating, the relationship between the reflection wavelength and temperature of MNFBG surrounded by liquid with different refractive index is numerically simulated, and the MNFBG of replaceable encapsulated liquid is made for experimental study.By encapsulating MNFBGs with distilled water and matching liquid with different refractive index, the variation of MNFBG reflectance spectrum and its central wavelength with the encapsulation liquid temperature was obtained.It is found that the shape and direction of the MNFBG reflectance spectrum are affected by different properties of the encapsulated liquid during the same temperature change.The characteristic that the reflection spectrum shape is almost invariable but the center wavelength of FBG is linear redshift is changed in the process of increasing temperature of ordinary fiber Bragg grating (FBG).The larger the refractive index and thermo-optical coefficient of encapsulated liquid is, the more nonlinear the reflection wavelength of MNFBG is with temperature.The temperature sensitivity of the reflection wavelength of the matched liquid is -50.3 pm / 鈩，

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