Eguchi Masashi, Tsuji Yasuhide
Department of Photonics System Technology, Chitose Institute of Science and Technology, Chitose, 066-8655 Japan.
Appl Opt. 2010 Nov 10;49(32):6207-12. doi: 10.1364/AO.49.006207.
A holey fiber having a core with an elliptical-hole lattice structure, which is referred to as an elliptical-hole core circular-hole holey fiber (EC-CHF), can be easily designed as a single-polarization fiber by using the fundamental space-filling modes of the core and cladding lattices. However, because the guided mode in an EC-CHF has a polarization that arises from the large geometric anisotropy of the core lattice, the influence of the bending direction on the bending loss is a crucial issue for the practical implementation of EC-CHFs. Here, the bending losses of an EC-CHF bent in arbitrary angular orientations with respect to the core cross section are calculated numerically using the equivalent anisotropic step-index circular fiber model for a real EC-CHF, and the influence of the bending direction of the fiber on the bending loss is discussed.
一种具有椭圆孔晶格结构纤芯的多孔光纤，被称为椭圆孔芯圆孔多孔光纤（EC-CHF），通过利用纤芯和包层晶格的基本空间填充模式，可以很容易地设计成单偏振光纤。然而，由于EC-CHF中的导模具有源自纤芯晶格较大几何各向异性的偏振特性，对于EC-CHF的实际应用而言，弯曲方向对弯曲损耗的影响是一个关键问题。在此，使用实际EC-CHF的等效各向异性阶跃折射率圆形光纤模型，对相对于纤芯横截面以任意角度取向弯曲的EC-CHF的弯曲损耗进行了数值计算，并讨论了光纤弯曲方向对弯曲损耗的影响。
