We report a study investigating the effects of thermal annealing on the optical properties of Si-Ge alloy-core silica-cladded fibers. Low temperature fiber draw was performed with a laboratory-made draw tower at 1760 °C that minimizes impurity diffusion from cladding to the core. As a post-drawing process, Si–Ge core fibers were annealed in a box furnace to alter the core structure. Microstructural and optical properties of fibers were investigated, and transmission losses were measured as 28 dB/cm at 6.1 µm. Numerical studies were performed to analyze the experimental results and to find the optimum structure for low loss semiconductor-core glass-cladded fibers.

中文翻译：

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热退火对半导体合金芯玻璃包覆光纤中红外传输的影响

我们报告了一项研究，研究了热退火对Si-Ge合金芯二氧化硅包覆纤维的光学性能的影响。低温纤维拉伸是在1760°C的实验室制造的拉伸塔上进行的，该工艺可使杂质从包层扩散到纤芯的扩散降至最低。作为后拉伸过程，Si-Ge芯纤维在箱式炉中退火以改变芯结构。研究了纤维的微观结构和光学性能，在6.1 µm处测得的传输损耗为28 dB / cm。进行了数值研究以分析实验结果并找到低损耗半导体芯玻璃包覆纤维的最佳结构。