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在光纤研制过程中掺铒光纤(EDF)的纤芯折射率控制尤为关键。对采用改进型化学气相沉积(MCVD)技术沉积纤芯疏松层,并用溶液浸泡法,采用不同铝离子浓度的氯化铒溶液制作的四种掺铒光纤进行了折射率测试和电子探针微小分析(EPMA)。提出了掺铝将改变原疏松层中的二氧化硅和二氧化锗的比例,铝离子进入疏松层越多,最后得到的掺铒光纤纤芯的二氧化锗的摩尔分数就会越少,用氧化铝生成和二氧化锗挥发两个化学反应式进行了解释。掺铝和掺锗都会提高纤芯的折射率,但由于锗减少引起的折射率降低量大于铝提高引起的折射率提高量,导致掺铝后纤芯的整体折射率下降。
Core refractive index control of EDF fibers is particularly critical during fiber development. The refractive index and electron microprobe analysis of four kinds of erbium-doped fibers deposited by modified chemical vapor deposition (MCVD) technique and the solution immersion method and the erbium chloride solution with different aluminum ion concentration (EPMA). Proposed aluminum doping will change the original loose layer of silica and germanium dioxide ratio, the more aluminum ions into the loose layer, the resulting erbium-doped fiber core germanium dioxide mole fraction will be less, with Alumina generation and germanium dioxide volatilization two chemical reaction formula was explained. Both aluminum doping and germanium doping increase the refractive index of the core, but the decrease of the refractive index due to the decrease of germanium is larger than the increase of the refractive index due to the increase of aluminum, resulting in the decrease of the overall refractive index of the core after aluminum doping.