The effect of drawing conditions on the optical properties of the bismuth-doped high-germania-glass core fibers has been studied. It was found that the gain characteristics of these fibers become better with the increase of the drawing speed from 10 to 100 m/min. The small-signal absorption spectra of the Bi-doped fibers obtained at drawing speeds lower than 1 m/min are characterized by a high level of the unsaturable loss and the presence of an unstructured band situated within a wavelength region of 1100 – 1250 nm. The variation of drawing temperature ranging from 1770 to 1830 °C almost did not affect the optical properties of the fibers studied. It was shown that an optimization of the drawing parameters can significantly increase the performance of the developed bismuth-doped fiber lasers.

中文翻译：

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拉制条件对掺铋高GeO2-SiO2光纤光学性能的影响

研究了拉制条件对掺铋高锗玻璃纤芯光纤光学性能的影响。发现这些纤维的增益特性随着拉伸速度从10增加到100m/min而变得更好。在低于 1 m/min 的拉制速度下获得的 Bi 掺杂光纤的小信号吸收光谱的特点是高水平的不饱和损耗和位于 1100 – 1250 nm 波长区域内的非结构化带的存在。拉伸温度范围从 1770 到 1830 °C 的变化几乎不影响所研究的光纤的光学性能。结果表明，拉制参数的优化可以显着提高所开发的掺铋光纤激光器的性能。