电场作用下掺锰石英光纤中线偏振光传输特性研究

Linear polarized light transmission characteristics in Mn-doped silica fiber under electric field

为克服传统的基于非光纤传感元件的光纤电压传感器在技术复杂、价格高昂、晶体损耗大且与光纤耦合困难等不足之处,首先研制出了掺锰石英光纤样品,进而实验研究了电场对掺锰石英光纤中线偏振光传输特性的影响。测试分析了掺锰石英光纤中线偏振光的偏转角随电场强度的变化,其呈近似的线性关系。同时,测试分析了线偏振光的偏转角随电场强度的变化灵敏度与掺锰石英光纤长度之间关系。获得掺锰石英光纤长度分别为2.5、5和10 m时,其偏转角随电场强度的变化灵敏度分别为1.23×10^（-3）°m/kV、2.46×10^（-3）°m/kV和3.26×10^（-3）°m/kV。研究结果表明,所研制的掺锰石英光纤中线偏振光的偏转角与电场强度之间的线性关系在全光纤高压传感领域将具有潜在的应用价值。

To overcome the inadequacies of traditional fiber voltage sensors based on non-fiber sensing elements, such as complicated technology, high cost, large crystal loss and the difficulty in coupling with optical fibers, we first developed Mn-doped silica fiber samples and researched the effect of the linear polarized light transmission characteristics in the Mn-doped silica fiber under the electric field. Then the variation of the deflection angle of the linear polarized light in the Mn-doped silica fiber with the electric field intensity was analyzed and it shows an approximately linear relationship. In addition, the relationship between the deflection angle of the linear polarized light and the length of the Mn-doped silica fiber was analyzed. When the measured Mn-doped fibers are 2.5, 5 and 10 m, the sensitivities of the deflection angle of the linear polarized light with the change of the electric field intensity are 1.23×10^（-3） °m/kV, 2.46×10^（-3） °m/kV, 3.26×10^（-3） °m/kV respectively. The research results show that the linear relationship between the linear polarized light deflection angle in the Mn-doped silica fiber and the electric field intensity will have potential application value in the field of all-fiber high voltage sensing.