温度对双芯布拉格光纤光栅二阶偏振模色散影响的研究

Study on the Influence of Temperature on Second-order of Polarization Mode Dispersion on Bragg Fiber Grating

应用了一种对称结构的双芯光纤,写入对称的光栅,形成双芯布拉格光纤光栅.实验研究其在不同温度下的反射谱线和二阶偏振模色散(PMD)随波长变化曲线,分析了二阶PMD随温度变化的情况.实验表明,二阶PMD随着温度的变化而改变,温度增加两峰中心波长的漂移程度相同,其他因素无明显变化,二阶PMD中心波长峰值随温度增加成线性向长波长方向漂移.研究结果对双芯光纤光栅温度传感的应用提供了一定的指导意义.

A symmetrical structure of twin-core fiber is used to write a symmetrical grating to form a twin-core Fiber Bragg Gratings. The reflection spectrum and the second-order PMD with the wavelength change curves at different temperature are studied experimentally,and the change of the second-order PMD with the temperature is analyzed. The experiment shows that the second-order PMD changes with the temperature change,the temperature increases,the center wavelength of the two peaks shift the same degree,and the other factors have no abvious change. The second-order PMD center wavelength peak increases linearly with temperature towards the direction of long wavelengths. The results provide some certain guiding significance for the application of the twin-core fiber grating temperature sensing.