Novel Low-Loss Bandgaps in All-Silica Bragg Fibers
Novel Low-Loss Bandgaps in All-Silica Bragg Fibers
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DOI：
10.1109/jlt.2007.911907
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发表时间：
2008-02
影响因子：
4.7
通讯作者：
K. J. Rowland;S. Afshar;T. Monro
中科院分区：
文献类型：
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作者：
K. J. Rowland;S. Afshar;T. Monro
我们证明了在全硅布拉格光纤中的高阶带隙可以具有比使用基本带隙的模式低四个数量级的限制损耗。提出了一种通过光纤几何形状的全局缩放来利用任意特定波长的高阶带隙的方案。这种方法提供了比通过缩放芯来减少基本间隙的限制损耗更低的损耗。使用各种建模技术，我们已经研究了理想化的空芯全硅布拉格光纤的带结构和指导。它表明，高阶，低损耗，带隙分析在这里是唯一的单一材料布拉格光纤访问，并从根本上不同于高阶间隙通常与抑郁指数布拉格光纤，如ldquoOmniguiderdquo光纤。进一步的分析表明，布拉格光纤的导模的一些关键特征可以通过考虑单空芯均匀介质波导（ldquoboreholesrdquo）的属性来理解。
We demonstrate that higher order bandgaps in all-silica Bragg fibers can have modes with four orders of magnitude lower confinement loss than those using the fundamental bandgap. A scheme for exploiting the higher order gaps for any specific wavelength via a global scaling of the fiber geometry is proposed. This approach provides lower losses than by reducing the confinement loss of the fundamental gap by scaling the core. Using a variety of modeling techniques, we have examined the band structure and guidance of idealized air-core all-silica Bragg fibers. It is demonstrated that the higher order, low loss, bandgaps analyzed here are uniquely accessible to single-material Bragg fibers, and are fundamentally different from the higher order gaps typically associated with depressed-index Bragg fibers such as the ldquoOmniguiderdquo fibers. Further analysis suggests that some of the key features of the guided modes of Bragg fibers can be understood by considering the properties of single hollow-core homogeneous dielectric waveguides (ldquoboreholesrdquo).