This work reports on the fabrication and the characterization of hybrid optical fibers with silicon core and silica cladding. Adopting a two-step manufacturing technique derived from the stack-and-draw method, silicon-core fibers with core dimensions ranging from about 0.8 μm to 3.5 μm have been successively drawn into hundreds of meter-long fibers. A 3.3 μm diameter core fiber has been more extensively characterized and background losses for this as-drawn fiber are less than 0.2 dB/cm between 1250 nm and 1650 nm, with a minimum of 0.12 dB/cm around 1600 nm. The crystalline state of the core and the limited impact of oxygen contamination were confirmed by Raman scattering, x-ray diffraction, HR-STEM, and ToF-SIMS analysis. Transmission peaks associated with specific modal distributions are evidenced under certain injection conditions and their positions are shown to be in good accordance with mode cut-off wavelengths of a step-index silicon-core fiber.

中文翻译：

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两步制造数百米长的硅微米级芯光纤，背景损耗小于0.2 dB / cm

这项工作报告了具有硅芯和二氧化硅包层的混合光纤的制造和特性。采用从堆栈和-绘制法生成的两步制造技术中，与芯的尺寸范围为约0.8以下的硅芯光纤μ m至3.5 μ米相继吸入到数百米长的纤维。3.3微米直径更大的芯光纤已经得到了更广泛的表征，这种拉制光纤的背景损耗在1250 nm至1650 nm之间小于0.2 dB / cm，在1600 nm附近最小为0.12 dB / cm。通过拉曼散射，x射线衍射，HR-STEM和ToF-SIMS分析证实了核的结晶状态和有限的氧污染影响。在特定的注入条件下，与特定模态分布相关的传输峰得到了证明，并且其位置显示出与阶跃折射率硅芯光纤的模截止波长高度吻合。