有限包层Bragg光纤模式的分类与特性研究

Classification and properties of modes in Bragg fibers with a finite number of H/L layers

Bragg光纤是一种具有全向反射光子带隙的新型微结构光纤。分析了无限包层Bragg光纤中的模式,在此基础上对有限包层Bragg光纤中传输的模式进行了分类。通过对比研究无限包层Bragg光纤中的模式,把有限包层Bragg光纤的模式分为准导模、PML模和泄漏模,并对上述模式的特性进行了简要分析。

Bragg fiber is a new kind of microstructure fiber with wide-or omni-directional bandgap guidance. The mode of Bragg fibers with infinite number of H/L layersis analyzed, which paves the way for the classification of Bragg fibers with finite number of H/L layers. In comparative study of the properties of Bragg fibers with infinite number of H/ L layers, three modes can be classified in Bragg fibers with finite number of H/L layers in terms of the mode of spectrum. They can be identified as quasi-guided mode, leaky mode and PML mode, and their different properties are analyzed.