Design of graded index type photonic crystal fiber having α-power air hole diameter distribution with α < 1 for fiber collimator application
Design of graded index type photonic crystal fiber having α-power air hole diameter distribution with α < 1 for fiber collimator application
复制标题
用于光纤准直器应用的具有α次气孔直径分布且α<1的渐变折射率型光子晶体光纤的设计
DOI：
10.1007/s10043-019-00532-4
复制
发表时间：
2019
期刊：
影响因子：
1.2
通讯作者：
Y. Imai
中科院分区：
文献类型：
--
作者：
Mizuki Wakabayashi;H. Yokota;Y. Imai
在径向具有α幂次空气孔直径分布的梯度折射率型光子晶体光纤（GI-PCF）中，高斯光束激励的GI-PCF具有光束直径沿传播方向沿着周期性变化的特性，类似于GI型多模光纤（GI-MMF）。由于GI-MMF被用作光纤准直器，因此认为GI-PCF也可以应用于光纤准直器。然而，在考虑较高的耦合效率的情况下，难以利用空气孔直径控制来拉制光纤。本文从理论上分析了高斯光束激励的具有α< 1的α幂次空气孔直径分布的GI-PCF中的光传输特性，并研究了其与传统PCF的耦合效率及其波长特性。结果表明，当α< 1时，空气孔直径越小，耦合效率越高。特别地，在α= 1/2时，获得了对光纤长度误差和波长特性的更好容限。根据这些结果和GI-PCF的制作难度，我们设计了适合光纤准直器应用的GI-PCF结构。
A graded-index type photonic crystal fiber (GI-PCF) that hasα-power air hole diameter distribution in radial direction has a characteristic that the beam diameter varies periodically along the propagation direction in the Gaussian beam excited GI-PCF, and it is similar to a GI type multimode fiber (GI-MMF). Since GI-MMFs are used as fiber collimators, it is considered that GI-PCFs are also possible to apply for fiber collimators. However, it is difficult to draw fiber with air hole diameter control in considering higher coupling efficiency at. In this paper, we theoretically analyzed light propagation characteristics in Gaussian beam excited GI-PCF havingα-power air hole diameter distribution withα< 1 and investigated the coupling efficiency with conventional PCF and its wavelength characteristics. It was found that the coupling efficiency became larger as the air hole diameterdwas smaller atα< 1. In particular, a better tolerance for fiber length error and wavelength characteristics were obtained atα= 1/2. From these results and the difficulty of GI-PCF drawing, we designed the suitable structure of GI-PCF for fiber collimator application.
影响因子：
3.6
作者：
M. Koshiba;K. Saitoh
通讯作者：
M. Koshiba;K. Saitoh