Device and method for preparing rare earth-doped optical fiber preform

The invention discloses a device and a method for preparing a rare earth doped optical fiber. According to the preparation process, the rare earth chelate has extremely high saturated vapor pressure at about 200 DEG C, so that the complexity of equipment can be reduced, and the process is convenient to control; the flow of carrier gas He is adjusted through the MFC to control the concentration of rare earth ions, so that accurate doping is realized; by utilizing the characteristics that a co-doping agent aluminum trichloride has extremely high vapor pressure at a high temperature of 100-200 DEG C, but the aluminum trichloride is easy to absorb water vapor to deliquesce and has strong corrosivity, a pure quartz glass crucible or a pure aluminum trichloride crucible is adopted to heat and evaporate in a liner tube, and the doping amount of the aluminum trichloride is controlled by adjusting the temperature. 本发明公开了提供了一种制备掺稀土光纤的装置及方法。该制备工艺利用稀土螯合物在200℃左右便具备极高的饱和蒸气压，可以降低设备的复杂度，便于工艺控制；通过MFC调节载气He的流量控制稀土离子的浓度，实现精准掺杂；