METHOD FOR EFFICIENTLY PREPARING DOPED OPTICAL FIBRE PREFORM AND DOPED OPTICAL FIBRE PREFORM

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Provided are a method for preparing a doped optical fibre preform and a doped optical fibre preform. The steps of the method are as follows : formulating a rare earth material or a functional metal material and a co-doping agent into a doping solution, mixing a high-purity quartz powder with the doping solution, drying same at a temperature of 100ºC - 150ºC for 12 - 48 h, crushing and screening same to obtain a doped quartz powder; depositing the doped quartz powder onto the surface of a target rod (1) to form a doped core layer (2); replacing the doped quartz powder with the high-purity quartz powder, and depositing the high-purity quartz powder onto the surface of the doped core layer to form a quartz outer cladding (3); and removing the target rod (1), and gradually collapsing the entirety formed from the doped core layer (2) and the quartz outer cladding (3) at a high temperature to obtain the doped optical fibre preform.