组合磁光光纤光栅的磁场敏感性分析

磁光光纤光栅是一种具有磁光效应的特殊光栅,可直接用于本征型的磁场传感或通过磁控的方式实现可调光子信息处理。该文采用分段均匀模型分析了几种组合磁光光纤Bragg光栅中左右旋圆偏振光的偏振相关损耗对磁场的敏感性,计算表明,均匀磁光光纤光栅的中心区段对磁场最为敏感。提出了一种比均匀磁光光栅更加灵敏的F-P型组合光栅传感结构,可更好地用于较弱磁场下偏振相关损耗的检测。

Magnetic Field Sensitivity of Sectional Magneto-Optic Fiber Gratings

Magneto-optic fiber gratings are a class of special fiber gratings with magneto-optical effects, which are useful for intrinsic magnetic field sensing and realizing magnetic controlled photonic information processing. The magnetic field sensitivity of polarization-dependent loss for left-/right-handed circularly polarized light in sectional magneto-optic fiber Bragg gratings (MFBGs) is analyzed by using the piecewise-uniform grating model and it is shown that the central section of uniform MFBGs is most sensitive to magnetic field. The F-P structure of sectional MFBGs is presented, which is superior to the corresponding uniform MFBGs for measuring the polarization-dependent loss in the range of small magnetic field.