Manufacturing method of rare earth-doped optical fiber preformed rod

Abstract

A manufacturing method of a rare earth-doped optical fiber preformed rod relates to the field of optical fiber preformed rods, and comprises the following steps: S1, mounting a cylindrical rare earth material preformed target rod at a gas inlet end in a quartz glass substrate tube, mounting the substrate tube on a chemical vapor deposition device; S2, focusing laser on the rare earth material preformed target rod, introducing mixed gas composed of oxygen, chlorine, silicon tetrachloride gas, germanium tetrachloride gas, and carbides of fluorine, performing deposition to form an optical fiber core rod preform; S3, melting the optical fiber core rod preform for contraction at a high temperature to form the transparent optical fiber preformed rod. The method increases the diameter of the optical fiber preformed rod, greatly improves the production manufacturing efficiency and the rare earth ion doping uniformity of the rare earth-doped optical fiber preformed rod, reduces the content of ineffective impurities of the optical fiber preformed rod, also reduces the production cost, and is suitable for popularization of large-scale production.

Description

technical field [0001] The invention relates to the field of optical fiber preforms, in particular to a method for manufacturing rare earth-doped optical fiber preforms. Background technique [0002] In the field of fiber lasers and optical amplifiers, rare earth-doped optical fiber and preform manufacturing technology is the core technology, however, the rare earth ions are prone to cluster phenomenon in the quartz matrix, so the concentration of rare earth ions doped in the optical fiber is limited, it is difficult Meet the gain requirements of fiber lasers. Since the doping concentration of pure silica fiber cannot be too high, low concentration and low absorption make the fiber very long to fully absorb the optical pump power. However, using the communication fiber technology, the background absorption of the core is 5-10 dB / km. On the other hand, since the melting point and vaporization temperature of inorganic compounds of rare earth elements are very high, it is diff...

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Problems solved by technology

[0009] In summary, in the process of manufacturing rare earth-doped optical fiber preforms, the conventional process has the following defects: the vapor phase evaporation method of the material cabinet has too high requirements for equipment insulation and high temperature resistance, and the co-doping method is complicated; the rare earth-doped optical fiber preform prepared by the melting method Optical fiber preforms put forward higher requirements for molten materials. At the same time, the doping elements of optical fiber preforms prepared by melting method are still mainly particles; Low, high manufacturing cost, does not have the problem of large-scale production

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