Method for preparing rare earth doped optic fiber preform

Abstract

The method relates to the technical field of optic fiber production methods, in particular relating to a method for preparing a rare earth doped optic fiber preform. The method comprises the following steps: selecting a quarz base tube, introducing CCl2F2 and O2 into the quarz base tube, burning, polishing and depositing a barrier layer; preparing rare earth metal chloride, and dehydrating the rare earth metal chloride; selecting an intermediate AlCl3 and dehydrating the intermediate AlCl3; and heating, gasifying and mixing the dehydrated rare earth metal chloride and AlCl3; heating and gasifying glass generation compositions SiCl4, GeCl4 and POCl3; reelingly stirring and mixing the mixed metal chloride and the gasified glass generation compositions and depositing in the quarz base tube so as to form a rare earth doped core layer; and finally shrinking the generated product into a rod so as to form the optic fiber preform. The method has the advantages that the concentration and uniformity of various rare earth doped substances can be precisely controlled, so that the performance of the rare earth optic fiber can be further optimized.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing methods, in particular to a method for preparing rare earth-doped optical fiber preform rods. Background technique [0002] In 1985, British scholars successfully invented the trial production of rare earth-doped optical fibers using MCVD technology. For more than 20 years, scholars from various countries have made many improvements and innovations to its preparation process. Great progress has been made in improving optical properties, rare earth doping concentration, and distribution uniformity of optical fibers. Now the United States, Japan, and Canada have realized industrialized production and occupied the international market. Today, rare earth-doped optical fibers are mainly used in the preparation of optical fiber amplifiers, optical fiber lasers, and optical fiber sensors. Global sales of optical fiber amplifiers increased from US$3 billion in 2000 to US$7 billion i...

AI Technical Summary

Problems solved by technology

However, due to difficulties in controlling the doping concentration and uniformity of the fiber core, it was not possible to complete industrial production

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