In this paper, a novel polarization-maintaining highly birefringent photonic crystal fiber (PMHB-PCF) has been investigated by using finite element method (FEM). Initially, the numerical analysis is carried out to ascertain its PMHB characteristics by using two different novel PCF structures (hexagonal-elliptical PCF and elliptical-elliptical PCF) and their performance characteristics are measured. By inducing the asymmetries in the fiber structure, the beat length of the fiber and their modal birefringence have been optimized. In proposed designs hexagonal-elliptical (cladding layers) PCF structure provides an ultra-high birefringence of about 4.51 × 10^–2 with a lower beat length of 34.37 µm. This reported fiber exposed a high nonlinear coefficient of about 61. 95 W⁻¹ km⁻¹ at the operating wavelength of 1.55 µm. Also, it has a normalized frequency parameter (V parameter) of about 1.373 over the optical spectrum of 1.3 to 1.6 µm; it ensures the fiber single-mode operation. Due to the high nonlinearity and birefringence, this fiber is more suitable for nonlinear applications. It confirms the phase-matching conditions for the purpose like wavelength conversion which employs four-wave mixing technique.

本文采用有限元方法研究了一种新型的保偏高双折射光子晶体光纤（PMHB-PCF）。最初，通过使用两种不同的新颖PCF结构（六边形椭圆PCF和椭圆椭圆形PCF）进行数值分析，以确定其PMHB特性，并测量其性能特征。通过在光纤结构中引起不对称，光纤的拍频长度及其模态双折射得到了优化。在建议的设计中，六边形椭圆形（覆层）PCF结构可提供约4.51×10 ^–2的超高双折射，且拍频长度较短，为34.37 µm。该报告的光纤暴露出约61. 95 W ^-1  km的高非线性系数在工作波长为1.55 µm时为^-1。另外，在1.3〜1.6μm的光谱上，归一化的频率参数（V参数）约为1.373。它确保了光纤的单模运行。由于高度的非线性和双折射，这种光纤更适合于非线性应用。它确定了相位匹配条件，用于采用四波混频技术的波长转换等目的。