Device and method for preparing glass optical fiber preform

The invention discloses a preparation device of a glass optical fiber preform and a preparation method of a high-rare-earth-ion-concentration-doped fluorine-based glass optical fiber preform for gain optical fibers. In the device, glass liquid is drained through the drainage wire, and the fluorine-based glass optical fiber preform growing in the mold environment with uniform temperature gradient is pulled down, so that the fluorine-based glass optical fiber preform has the characteristics of completeness and no devitrification. The preparation method is simple and fast, short in preparation period and expected to be applied to the fields of national defense, medical treatment and civil use. 本发明公开了一种玻璃光纤预制棒的制备装置及一种增益光纤用高稀土离子浓度掺杂的氟基玻璃光纤预制棒的制备方法。在该装置中，通过引流丝引流玻璃液，在均匀温度梯度的模具环境中下拉生长的氟基玻璃光纤预制棒，具备完整不析晶的特性。此制备方法简便快捷，制备周期短，有望应用于国防、医疗及民用领域。