Production equipment for manufacturing excellent optical fiber preforms by VAD (vapor axial deposition) method

Abstract

The invention relates to production equipment for manufacturing excellent optical fiber preforms by a VAD (vapor axial deposition) method. The production equipment comprises a seed rod, a blank rod, atransmission mechanism, a supply mechanism, a heating mechanism and two supporting mechanisms. The supply mechanism comprises a gear, a supporting shaft, a rack, a translation unit and at least two oxyhydrogen flame blast burners. The translation unit comprises a first motor, a first connecting rod and a second connecting rod. The heating mechanism comprises a heating ring and at least two heating components, and each heating component comprises a regulating plate, an X-ray detector, a laser emitter and a regulating unit. The production equipment for manufacturing the excellent optical fiberpreforms by the VAD (vapor axial deposition) method has advantages that the supply mechanism enables the oxyhydrogen flame blast burners to rotate, reaction gas is supplied to each position at the bottom end of the blank rod, uniform attachment of dust on the outer periphery of the seed rod is benefited, heating conditions at each position of the outer periphery of the blank rod are controlled through the heating mechanism, the reaction degree at each position is controlled according to production conditions to enable uniform attachment of dust on the surface of the seed rod, and accordingly optical fiber preform production quality is improved.

Description

technical field [0001] The invention relates to the field of optical fiber equipment, in particular to a well-manufactured optical fiber preform production equipment using the VAD method. Background technique [0002] Optical fiber preforms are also called rods. The manufacturing process is the process of making silicon tetrachloride and other raw materials into preforms with the same refractive index distribution as optical fibers and a diameter of 1 to 3 cm. There are many manufacturing methods, commonly used are: MCVD method, VCD method, OVD method and PCVD method. Among them, the VCD method belongs to the external tube method, which is to send high-purity silicon tetrachloride, tetragreen germanium and other reagents into the hydrogen-oxygen flame blowtorch in a gaseous state to oxidize into ultra-fine dust such as silicon dioxide and germanium dioxide and deposit them in a rotating state. The lower end surface of the quartz glass seed rod used as the target forms a bla...

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Problems solved by technology

[0003] When using the VAD method to manufacture optical fiber preforms, since the position of the hydrogen-oxygen torch at the bottom of the blank is fixed, the distribution of the reaction gas around the seed rod inside the blank is uneven, resulting in the formation of silicon dioxide and The uneven deposition of germanium and other dust affects the production quality of the optical fiber preform. Not only that, there is usually an annular heater on the top of the preform to heat the outer periphery of the preform to promote the reaction. The amount of heat radiation in the same direction is equal, so that the degree of reaction inside the billet is the same. Due to the slight difference in the dust deposition around the seed rod, the uniform heating method cannot ensure the uniform dust deposition around the seed rod. Therefore, a ring heater is used. The heating reaction cannot finely adjust the periphery of the seed rod, thereby reducing the production quality of the optical fiber preform

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