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Method for preparing low water peak optical fiber preform

A technology of optical fiber preform and low water peak, applied in glass manufacturing equipment, manufacturing tools, glass production, etc., can solve the problems of complex control, low efficiency and speed limit, etc., achieve high deposition efficiency, simple control, and reduce manufacturing costs Effect

Active Publication Date: 2014-03-26
TONGDING INTERCONNECTION INFORMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Aiming at the above-mentioned problems of complex control, low efficiency and speed limit, the present invention discloses a new VAD deposition method, which provides target rods for core layer deposition during the entire deposition process, and simplifies the density and geometric dimensions during the growth process of powder rods Control, improve deposition efficiency and rate, and provide a method to reduce hydrogen-containing impurities existing in the central hole due to dehydration and sintering process, and prepare optical fiber preforms that can be used for low water peak optical fibers

Method used

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  • Method for preparing low water peak optical fiber preform
  • Method for preparing low water peak optical fiber preform
  • Method for preparing low water peak optical fiber preform

Examples

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Effect test

Embodiment 1

[0078] In the VAD method deposition, a ceramic target rod with a diameter of 8mm is used, and two torches are used to deposit the core layer and the cladding powder layer to a diameter of 55mm and 200mm respectively, where the core layer is SiO 2 with GeO 2 mixture, clad with SiO 2 Powder, the average density of powder is 0.55gram / cm 3 , The length of the powder body is 1000mm. After the deposition, the ceramic target rod is removed from the powder body, and a solid glass rod with an outer diameter of 8.1mm and a length of 90mm is installed at the end of it, and the solid rod is a high-purity quartz rod with a hydroxyl content of less than 1ppm. Then transfer the powder body to the conveying platform of the dehydration sintering furnace, and extend the preform into the dehydration sintering furnace from top to bottom. The large-scale design of up to 55mm dilutes the effect of subsidence. In order to avoid the glass liner in the sintering furnace softening and deforming due ...

Embodiment 2

[0081] In the VAD method deposition, a ceramic target rod with a diameter of 8mm is used, and two torches are used to deposit the core layer and the cladding powder layer to a diameter of 18mm and 220mm respectively, and the core layer is SiO 2 with GeO 2 mixture, clad with SiO 2 Powder, the average density of powder is 0.55gram / cm 3 , The length of the powder body is 1000mm. After the deposition, the ceramic target rod is removed from the powder body, and a solid glass rod with an outer diameter of 8.1mm and a length of 90mm is installed at the end of it, and the solid rod is a high-purity quartz rod with a hydroxyl content of less than 1ppm. Then the powder body is transferred to the conveying platform of the dehydration sintering furnace, and the preform is extended from top to bottom into the dehydration sintering furnace whose cavity is lined with glass tubes.

[0082] Cladding diameter 1310nm attenuation 1383nm attenuation 1550nm attenuation 125μm...

Embodiment 3

[0084] In the VAD method deposition, a ceramic target rod with a diameter of 8mm is used, and three torches are used to deposit the core layer respectively. The diameters of the first cladding layer and the second cladding powder layer are 65mm, 160mm and 280mm, and the core layer is SiO 2 with GeO 2 mixture, clad with SiO 2 Powder, the average density of powder is 0.55gram / cm 3 , The length of the powder body is 800mm. After the deposition, the ceramic target rod is removed from the powder body, and a solid glass rod with an outer diameter of 8.1mm and a length of 90mm is installed at the end of it, and the solid rod is a high-purity quartz rod with a hydroxyl content of less than 1ppm. Then the powder body is transferred to the conveying platform of the dehydration sintering furnace, and the preform is extended from top to bottom into the dehydration sintering furnace whose cavity is lined with glass tubes.

[0085] Raise the temperature of the hot zone to 1100°C, fill th...

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Abstract

The invention relates to a method for preparing a low water peak optical fiber preform, which comprises the following steps: (a) depositing powder containing SiO2, GeO2 and the like on a target bar through vapor axial deposition (VAD); (b) after the powder body is deposited on the target bar, withdrawing the target bar from the powder body; (c) mounting a holding mechanism at one end of the tubular powder body and a plug at the other end, feeding the powder body into a heating furnace filled with dewatering gas and heat-conducting gas by means of the holding mechanism, and dewatering and sintering the tubular powder body to obtain a tubular glass body; (d) welding extension tubes at both ends of the sintered tubular glass body, eroding in a liquid containing hydrofluoric acid, cleaning the central hole region and the external surface, and drying in a clean; (e) transferring the dried tubular glass body into an electrothermal furnace containing oxygen gas and fluorine-containing gas, and performing melting shrinkage; and (f) cladding the stretched glass bar in optical fibers or directly performing wire drawing to form optical fibers.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and relates to a method for manufacturing an optical fiber preform, in particular to a method for preparing a large-size low-water peak optical fiber preform by vapor axial deposition (VAD). Background technique [0002] The manufacture of optical fiber preforms generally adopts a two-step process, that is, the core rod is manufactured first, and then the outer cladding is manufactured using different technologies outside the core rod. There are four typical mandrel manufacturing methods: Modified Chemical Vapor Deposition (MCVD), Plasma Enhanced Chemical Vapor Deposition (PCVD), Out-of-tube Vapor Deposition (OVD) and Axial Vapor Deposition ( VAD). The outer cladding manufacturing technology is classified into casing method and direct deposition outsourcing according to the outsourcing method, and OVD, VAD and APVD methods are classified according to the preparation process of the clad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018
CPCY02P40/57
Inventor 沈小平吴仪温王强强范修远张亮李震宇蒋小强
Owner TONGDING INTERCONNECTION INFORMATION CO LTD
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