Method for preparing rare earth ion doped optical fiber preform, device and product

Abstract

The invention discloses a method for preparing a rare earth ion doped optical fiber preform, a device and a product. The method comprises the following steps: depositing a pure SiO2 core layer basic powder rod; carrying out all-solution rare earth doping treatment on the pure SiO2 core layer basic powder rod; processing the core layer basic powder rod obtained after soaking is finished to obtain aprefabricated rod core layer; and depositing a cladding powder rod on the preform core layer, and processing the cladding powder rod to obtain the glass preform. According to the invention, the rareearth ion doped optical fiber preform is prepared by adopting a VAD method in combination with a full-solution doping method, and only pure SiO2 is deposited and does not contain other elements such as germanium, phosphorus and the like when the basic powder rod of the core layer is prepared, so that the deposition difficulty of the powder rod is greatly reduced, the deposition process is more controllable, and the component design of the rare earth ion doped preform is not influenced, deposition is uniform, according to the invention, doping is carried out by using an all-solution method, sothat the process is simpler, and the utilization rate of raw materials is higher.

Description

technical field [0001] The invention relates to the technical field of preparing a rare earth ion doped optical fiber preform, in particular to a method, device and product for preparing a rare earth ion doped optical fiber preform. Background technique [0002] Rare earth-doped optical fiber preform is an important basis and pre-material for the preparation of rare earth-doped optical fiber, and is the key core technology in the production process of rare earth-doped optical fiber. At present, the large-scale commercial preparation of optical fiber preform mainly includes in-tube deposition method and out-of-tube deposition method. The advantage of the in-tube deposition method is that the deposition accuracy is high, but its disadvantage is that the size of the prepared preform is limited by the size of the deposition liner. At the same time, the energy (hydrogen-oxygen flame heat source or plasma source) is transferred from the outside of the deposition liner to the gaseo...

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Problems solved by technology

[0004] For example, patent CN102108008A discloses a method for preparing rare earth-doped optical fiber by VAD method. The method uses VAD to deposit a large-sized preform core layer base powder, and then immerses the preform core layer base powder in a solution containing rare earth ions. In this method, the rare earth ion doping of the large-size preform core layer powder is realized, but this method removes the deposited silica (SiO2) during the preparation of the preform core layer base powder. 2 ) and germanium dioxide, these two basic materials, also deposited phosphorus (P, compound form), but phosphorus is not the basic material of the rare earth ion doped preform core layer, in the process of preparing the basic powder of the preform core layer The addition of P will affect the component design of the subsequent rare earth doped preform. The introduction of P in the preparation of the basic powder will increase the complexity and process difficulty of the OVD equipment, and the deposition efficiency of phosphorus compounds is low, and the saturated vapor pressure with SiCl 4 The difference is large, and it is easy to cause the problem of longitudinal unevenness of the preform

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