摘要
从理论上研究了波导耦合型刻蚀光纤布拉格反射器的特性。采用正交模式耦合理论描述其中的光栅辅助正反向模式耦合，用非正交模式耦合理论描述输入输出接口的模式激发，给出了分析耦合波导布格拉反射器的解析表达式。分析表明刻蚀光纤布拉格反射器中存在三种布拉格反射，在频谱中表现为六个分立的反射峰，与实验结果相符。其反射率不仅决定于耦合系数，还与其结构参数，尤其是Ａｌ２Ｏ３层的厚度、Ａｌ２Ｏ３层与光纤芯的距离以及匹配层折射率直接有关。
An analysis is presented for etched optical fiber Bragg reflectors using the normal mode based orthogonal coupled mode theory for the grating assisted coupling of forward and backward modes and, using waveguide mode based non orthogonal coupled mode theory for the mode excitation at the input/output junction. The analysis shows that three are three kinds of Bragg reflections in the reflector, which means six distinct peaks in the reflective spectrum when its polarization sensitivity taken into account. It agrees well with the experimental result. The power reflectivity depends on not only coupling coefficients but also structure parameters, especially the depth of the Al 2O 3 layer, the distance between the Al 2O 3 layer and the fiber core, and the refractive index of the index matching layer.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1998年第11期1537-1544,共8页
Acta Optica Sinica
关键词
刻蚀
光纤
布拉格反射器
模式耦合
结构参数
etched optical fiber Bragg reflector, mode coupling, structure parameters.
