Gui Fengji, Jiang Ping, Yang Huajun, Qin Yan, Caiyang Weinan
Appl Opt. 2018 Jan 1;57(1):6-13. doi: 10.1364/AO.57.000006.
In this work, a novel design of a high birefringence photonic crystal fiber (HB-PCF) with multimode and low confinement loss is proposed. To achieve high birefringence, the core is designed as an elliptical region, which is enclosed by twelve small holes. Based on this design, replacing the two circular holes at the top and bottom of the core region with two elliptical holes can further improve the birefringence. At the wavelength of 1.55 μm, the birefringence of the fundamental mode (LP) and the second-order mode (LP) are 1.70×10 and 1.85×10, respectively. Meanwhile, the confinement losses maintain on orders of 1×10 dB/km (LP) and 1×10 dB/km (LP). After the effective refractive indices of two types of the proposed HB-PCF are calculated by the finite element method, the birefringence, confinement loss, bending loss, dispersion, and nonlinear coefficient are studied. These results reveal that the HB-PCF might be applied for polarization-maintaining and nonlinear optics.
在这项工作中，提出了一种具有多模和低限制损耗的新型高双折射光子晶体光纤（HB-PCF）设计。为了实现高双折射，纤芯被设计成一个椭圆形区域，该区域由十二个小孔包围。基于此设计，用两个椭圆孔替换纤芯区域顶部和底部的两个圆形孔可以进一步提高双折射。在1.55μm波长处，基模（LP）和二阶模（LP）的双折射分别为1.70×10和1.85×10。同时，限制损耗保持在1×10 dB/km（LP）和1×10 dB/km（LP）量级。通过有限元方法计算出所提出的两种类型的HB-PCF的有效折射率后，研究了双折射、限制损耗、弯曲损耗、色散和非线性系数。这些结果表明，HB-PCF可能适用于保偏和非线性光学。
