掺Yb^(3+)石英光纤的制作

Fabrication of Yb^(3+)-doped silica optical fibers

利用一种新型的环形石墨炉加热的改进的化学汽相沉积(MCVD)车床制作出了高吸收、低背景损耗单包层高掺Yb3+石英光纤,并对其几何参数和吸收谱进行了测量、分析和讨论,得出了高掺Yb3+石英光纤的制作要点在于高质量疏松层的制作的结论,并分析了疏松层中掺P有助于提高掺Yb3+量的机理。制作出的高掺Yb3+单包层石英光纤样品在976 nm波长下的吸收可达594 dB/m,而背景损耗只有0.1 dB/m。

A sample of single cladding highly Yb3＋-doped silica optical fiber with high absorption and low background loss is fabricated by MCVD process with a new type of annular graphite heater furnace. Its geometric parameters and absorption spectrum are measured, analyzed and discussed, resulting in the conclusion that the key to this fabrication lies in depositing a high quality porous phosphosilicate layer （the soot layer） and that the P doing in the soot layer is helpful to the dopant solubility. Its ab sorption can be as high as 594 dB/m at 976 nm but its background loss is only 0.1 dB/m.