Nguyen Duc Minh, Blin Stéphane, Nguyen Thanh Nam, Le Sy Dat, Provino Laurent, Thual Monique, Chartier Thierry
Université Européenne de Bretagne, France/CNRS (UMR6082) Foton, Lannion, France.
Appl Opt. 2012 Feb 1;51(4):450-6. doi: 10.1364/AO.51.000450.
We propose a new solution for modal decomposition in multimode fibers, based on a spectral and spatial imaging technique. The appearance of spurious modes in the spectral and spatial processing of the images at the output of the fiber under test when it has more than two modes is demonstrated theoretically. The new method, which allows us to identify spurious modes, is more accurate, simpler, and faster than previously reported methods. For demonstration, measurements in a standard step-index multimode fiber and a small-core microstructured fiber are carried out successfully.
我们基于光谱和空间成像技术，提出了一种用于多模光纤模态分解的新解决方案。从理论上证明了，当被测光纤具有两种以上模式时，在其输出端图像的光谱和空间处理中会出现杂散模式。这种能够让我们识别杂散模式的新方法，比之前报道的方法更准确、更简单且速度更快。为作演示，我们成功地在标准阶跃折射率多模光纤和小芯径微结构光纤中进行了测量。
