A photonic crystal fiber (O-PCF) with a novel structure consisting of five octagonal-shaped layers of circular air holes in the cladding region and two elliptical air holes in the core region is presented for application in different communication fields for terahertz (THz) wave propagation. The O-PCF fiber is investigated using perfectly matched layers by applying the finite element method. Based on the results of the simulations, the proposed O-PCF fiber shows a low effective material loss of 0.0162 cm⁻¹, a higher effective area of 5.88 × 10^–8 m², a core power fraction of 80%, a scattering loss of 1.22 × 10^–10 dB/km, and a confinement loss of 3.33 × 10^–14 dB/m in the target region of 1 terahertz (THz). Due to its excellent characteristics, the proposed O-PCF fiber offers excellent transmission characteristic across a broad band of the terahertz region. Moreover, the suggested O-PCF fiber will be ideal for use in the terahertz (THz) region for different kinds of optical communication and biomedical applications.

提出了一种新型结构的光子晶体光纤（O-PCF），该光纤由五个八角形的包层区域中的圆形气孔层和两个核心区域中的两个椭圆形气孔组成，分别用于太赫兹（THz）的不同通信领域波传播。通过应用有限元方法，使用完美匹配的层对O-PCF纤维进行了研究。根据仿真结果，所提出的O-PCF光纤显示出0.0162 cm ^-1的低有效材料损耗，5.88×10 ^–8 m ²的较高有效面积，80％的纤芯功率分数，散射损耗。为1.22×10 ^–10  dB / km，限制损耗为3.33×10 ^–14 在1太赫兹（THz）的目标区域中为dB / m。由于其优异的特性，提出的O-PCF光纤在太赫兹区域的整个宽带范围内都具有出色的传输特性。此外，建议的O-PCF光纤将非常适合在太赫兹（THz）区域中用于各种类型的光通信和生物医学应用。