光纤布拉格光栅损耗特性的测量与分析  

Measurement and Analysis of Loss in Fiber Bragg Gratings

作　　者：王迪[1,2] 皮浩洋 李璇[1] 杨飞[1] 叶青[1] 蔡海文[1] Wang Di;Pi Haoyang;Li Xuan;Yang Fei;Ye Qing;Cai Haiwen(Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2018年第6期180-186,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61405212;61377062;61405218;61775225)

摘　　要：提出一种在线同步监测光纤布拉格光栅(FBG)损耗与折射率增长的方法,深入分析FBG的损耗特性在刻写时的演变过程,实验结果显示FBG的损耗系数α随耦合系数κ线性增长。为了优化FBG的损耗性能,采用损耗-耦合斜率系数α/κ衡量FBG损耗特性,结果表明:增加光纤与相位掩模板距离和使用0级衍射光衍射效率更强的相位掩模板均会使FBG的损耗-耦合斜率系数更大,这可能是与耦合系数无关的背景折射率增加所致;而且相比于载氢,采用载氘增敏方式可使FBG在1550nm附近的损耗-耦合斜率系数下降50%以上。An online synchronization measurement method for loss and refractive index growth of fiber Bragg grating（FBG）is demonstrated.The dynamic evolution of loss in FBG during the inscription process is studied in detail.The results show that the loss coefficientαof FBG linearly increases with its coupling coefficientκ.In order to optimize the loss performance of FBG,we propose the loss-coupling slope coefficientα/κto evaluate the loss characteristics of FBG.The results show that we can make the FBG loss-coupling slope coefficient larger by increasing the distance between the optical fiber and the phase mask or using the phase mask with higher diffraction efficiency of 0 order diffracted light,which may be caused by the increase of the background refractive index which is independent of coupling coefficient.And loss-coupling slope coefficientα/κof the FBG in D2-loading fiber is 50%lower than at 1550 nm,compared with it in H2-loading fiber.

关 键 词：光纤光学 光纤光栅 损耗测量 相位掩模板 光纤增敏 

分 类 号：TN253[电子电信—物理电子学]