A large mode-area (LMA) chalcogenide multicore fiber (MCF) with 13 hexagonally arranged cores has been designed and fabricated for mid-infrared (MIR) high power laser delivery. The dependence of mode distributions, bending loss and dispersion characteristics on the fiber structure parameters has been investigated by the method of finite element analysis at a wavelength range from 3 to 5 μm. An ultra-large fundamental mode (FM) effective area of ∼8000 μm² as well as a low normal dispersion down to -46 ps/nm/km at 3 μm are theoretically obtained, which is of great benefit to high power MIR laser delivery. The fiber possesses a calculated low bending loss less than 0.075 dB/m as the bending radius is larger than 0.4 m. Finally, a well-structured 13-core fiber consisting of Ge₉As₂₃Se₆₈ and Ge₁₀As₂₂Se₆₈ glasses is fabricated via the continuous two-stage extrusion method, and this fiber shows a low optical loss of 0.28 dB/m at 6.6 µm, which is the lowest fiber loss for a micro-structured chalcogenide fiber obtained via extrusion, to the best of our knowledge.

中文翻译：

---

连续两步挤出制备的大模面积硫族化物多芯纤维

已经设计并制造了具有13个六角形排列纤芯的大模面积（LMA）硫族化物多芯光纤（MCF），用于中红外（MIR）高功率激光传输。通过有限元分析方法研究了波长范围为3至5μm的模态分布，弯曲损耗和色散特性对纤维结构参数的依赖性。理论上可获得8000微米²的超大基本模式（FM）有效面积，以及在3微米处的法向色散低至-46 ps / nm / km，这对高功率MIR激光器的输送非常有利。当弯曲半径大于0.4 m时，该光纤的计算得出的低弯曲损耗小于0.075 dB / m。最后，由Ge ₉ As组成的结构良好的13芯光纤通过连续两阶段挤压法制造₂₃ Se ₆₈和Ge ₁₀ As ₂₂ Se ₆₈玻璃，该纤维在6.6 µm处显示出0.28 dB / m的低光学损耗，这是微结构化玻璃中损耗最低的据我们所知，通过挤压获得硫属化物纤维。