Rotation angle optimization of the polarization eigenmodes for detection of weak mode coupling in birefringent waveguides.
Rotation angle optimization of the polarization eigenmodes for detection of weak mode coupling in birefringent waveguides.
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DOI：
10.1364/oe.10.000972
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发表时间：
2002-09
期刊：
影响因子：
3.8
通讯作者：
Wencai Jing;Yimo Zhang;Ge Zhou;Hongxia Zhang;Z. Li;Xiaoming Man
中科院分区：
文献类型：
--
作者：
Wencai Jing;Yimo Zhang;Ge Zhou;Hongxia Zhang;Z. Li;Xiaoming Man
白光干涉测量法已被用来测量高双折射波导中的分布式偏振耦合。由于耦合模式与激发模式相比较弱，因此干涉图的对比度非常低。这将增加直接检测偏振耦合强度的难度。通过将偏振本征模与线偏振器主轴之间的角度从45度旋转到85度，干涉图的对比度可以提高10倍以上。其结果是，测量灵敏度可提高100倍以上。
White light interferometry has been adopted to measure distributed polarization coupling in high-birefringence waveguides. Since the coupling mode is weak compared to the exciting mode, the contrast ratio of the interferogram is very low. This will increase the difficulty of direct detection of the polarization coupling intensity. By rotating the angle between the polarization eigenmodes and the principal axis of the linear polarizer from 45 degrees to 85 degrees , the contrast ratio of the interferogram can be improved more than 10 times. As a result, the measurement sensitivity can be improved more than 100 times.