Optical fiber perform doper and doping method

Abstract

The invention provides an optical fiber perform doper and a doping method. The optical fiber perform doper comprises a heating system, a transmission system and an improved chemical vapor deposition system. The heating system comprises heating evaporators and air-intake ducts and air-outlet ducts which communicate with the heating evaporators. The transmission system comprises a heating and heat preservation transmission pipe and a heating and heat preservation plate. An oxygen pipe used for inletting high-purity oxygen and the air-outlet ducts are respectively accessed into the heating and heat preservation transmission pipe provided with corresponding interfaces. An output end of the heating and heat preservation transmission pipe communicates with a rotating part of the improved chemical vapor deposition system. Different organic metal chelates are placed in each heating evaporator, wherein an organic metal chelate in at least one of the heating evaporators is used as a doping agent. With the application of the doper provided by the invention, all gas-phase doping can be realized, and heat preservation during the whole course makes gases not to be easily coagulated. By the adoption of the doping method, doping uniformity and consistency of the product are both raised, and performance of the product is also guaranteed appropriately.

Description

technical field [0001] The invention belongs to optical fiber preparation technology, and relates to an optical fiber preform doping device and method thereof, in particular to an all-gas optical fiber preform doping device and method using an organic metal chelate as a dopant and a co-dopant . Background technique [0002] Rare earth-doped special fibers are widely used in fiber lasers, amplifiers and sensors, and have been greatly developed in recent years. The dopants used are Nd, Er, Ge, Pr, Ho, Eu, Yb, Dy , Tm and other elements with atomic numbers ranging from 57 to 71 can be individually doped with a certain rare earth element for single doping, or jointly doped with multiple rare earth elements for co-doping. It is characterized by a cylindrical waveguide structure, small core diameter, easy to achieve high-density pump lasing, low threshold value, large surface area, good heat dissipation performance, its core diameter matches communication optical fiber, high coup...

AI Technical Summary

Problems solved by technology

Although the solution doping technology has the advantages of simple operation and high flexibility, with the continuous rise of other doping technologies and technical optimization, the use of this method to dope rare earth ions in optical fibers has increasingly shown its limitations. The main performance In: large background loss, poor repeatability, low doping concentration, poor uniformity, uneven refractive index distribution, easy crystallization of the fiber core, difficulty in increasing the size of the core rod, long production cycle, low efficiency, and high cost.

The doping concentration of the chloride gas-phase doping method and the sol-gel meth

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