CN102923942A - Method for manufacturing large-diameter optical fiber perform rod - Google Patents
Method for manufacturing large-diameter optical fiber perform rod Download PDFInfo
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- CN102923942A CN102923942A CN2012104351050A CN201210435105A CN102923942A CN 102923942 A CN102923942 A CN 102923942A CN 2012104351050 A CN2012104351050 A CN 2012104351050A CN 201210435105 A CN201210435105 A CN 201210435105A CN 102923942 A CN102923942 A CN 102923942A
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- optical fiber
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention relates to a method for manufacturing a large-diameter optical fiber perform rod. The method includes: manufacturing a transparent solid quartz rod in an axial vapour deposition method through follow-up processing, wherein the transparent quartz rod comprises a core layer and a part of wrapping layer; filling the transparent quartz rod in a high-purity thick-wall quartz tube in a sleeve mode to form a primary optical fiber perform rod even in structure in concentration mode through high-temperature melting; and using the primary optical fiber perform rod as a target rod, depositing a SiO2 wrapping layer through an external vapour deposition method, and after the deposition, sintering the rod into the transparent optical fiber perform rod. By means of the method, a plurality of intermediate working procedures for manufacturing optical fibers in a pipe sleeve method are omitted, production efficiency of the optical fiber perform rod is effectively improved, cost is reduced, the processing property is stable, the optical parameters of the optical fibers are excellent, and scale production is facilitated.
Description
Technical field
The present invention relates to a kind of preparation method of large-scale optical fiber prefabricating stick, belong to the optic fibre manufacturing technology field.
Background technology
The preform preparation is the master operation of optic fibre manufacturing technology.Adopt the large-scale optical fiber prefabricating stick wire drawing can the Effective Raise utilization rate of raw materials, can effectively save the production time simultaneously and enhance productivity, large-scale optical fiber prefabricating stick have become Vehicles Collected from Market main flow trend.Large-scale optical fiber prefabricating stick is divided at present: large size solid preform and sleeve pipe add plug prefabricated rods form.
The current method that accounts for the large-scale preformod of optical fiber with low water peak of main flow is tiretube process, such as US005837334A, US007089765B2.Tiretube process is to produce first plug at present, this plug is inserted the quartz glass tube of size match again, and making plug and sleeve pipe melt synchronously the fusion prolongation through heat becomes photoconductive fiber.Tiretube process has the following disadvantages: the geometric accuracy that large-sized sleeve pipe requires is high, and manufacturing process is complicated, and the material unaccounted-for (MUF) in the sleeve pipe course of processing causes cost to increase.The interface of plug and sleeve pipe has increased the complexity of drawing optical fibers technique, the cleaning at interface and drying become stricter, and the interface has increased the probability that mechanical fiber optic strength weak link produces, increased the possibility of unit length fibercuts, the interface also has a negative impact to optical fiber water peak (being called the water peak owing to hydroxyl absorption peak in 1360nm ~ 1460nm scope in the Optical Fiber Transmission), the production cost that the technical process that waits elimination interface added influence to add has increased prefabricated rods is washed in plasma erosion, and sleeve pipe is expensive.
The OVD method is by the SiO of a plurality of blowtorch with hydrolysis
2Particle deposition is on the plug that rotates and relatively move.Sedimentation rate is high, but this deposition method forms screw-like or corrugated surface easily, and the plug two ends are inhomogeneous so that whole deposition rod forms fusiform, and then the optical fiber geometric parameter and the optical parametric that cause whole rod to be drawn into are inhomogeneous unstable.
The VAD method has identical flame hydrolysis mechanism with the OVD method.Sedimentation rate is the greatest drawback of VAD slowly, and still, its advantage is process stabilizing, and loosening body composition structure and geometrical dimension that deposition obtains are even.
Method PCVD and MCVD are suitable for preparing high-precision complex construction in the pipe, but both sedimentation rates are lower, and less than 3g/min, and the interior method of pipe can't be prepared separately the prefabricated rods of large specification, purity requirement to unstripped gas reaches 99.9999%, and is expensive so that use and to be restricted.
The APVD sedimentation rate is higher, but its raw material high-purity natural quartz sand is with high costs and homogeneity is wayward so that this technique is difficult for widespread use.
Terms more of the present invention are defined as:
Deposition: the technological process that physicochemical change generates silica glass occurs in starting material under certain conditions;
Refractive index profile: the relation curve between prefabricated rods/plug/optical fiber glass refraction and its radius;
The heavy wall silica tube: the quartz glass tube of the relative caliber large percentage of wall thickness, ratio are usually greater than 10%, and wall thickness is usually greater than 3mm;
VAD: axial vapor deposition;
OVD: outside vapour deposition.
Summary of the invention
Technical problem to be solved by this invention is to provide for the deficiency of above-mentioned prior art existence a kind of preparation method of large-scale optical fiber prefabricating stick; it can not only the Effective Raise preform production efficiency; reduce cost; and processing performance is stable; the fiber optics parameter is excellent, is convenient to large-scale production.
The present invention is that the technical scheme that the problem of the above-mentioned proposition of solution adopts is:
The method may further comprise the steps: adopt axial vapor deposition method (VAD) and prepare the transparent solid quartz pushrod through subsequent disposal, described transparent solid quartz pushrod comprises sandwich layer and part covering; The transparent solid quartz pushrod is set in high-purity heavy wall silica tube shortens the uniform elementary preform of a root architecture into by high temperature melting; As the target rod, deposit SiO with outside vapour deposition process (OVD) with this elementary preform
2Surrounding layer after deposition is finished, sinters it into transparent preform.
Press such scheme, the covering of described transparent solid quartz pushrod/sandwich layer diameter is 1.8 ~ 3 than (b/a).
Press such scheme, the subsequent disposal of described axial vapor deposition method is that the loosening body that the axial vapor deposition method is made is excellent through changing transparent stuffed quartz into after the dehydration sintering, then carry out Shape correction, comprise melting, stretching, grinding, polishing, chemolysis, cleaning, make its diameter even, any surface finish, transparent solid quartz pushrod surfaceness is less than or equal to 20 μ m.
Press such scheme, the standby SiO of described axial vapor deposition legal system
2Loosening body is significant part along 2/3 the part of surpassing that the useful length of axis direction accounts for the axial overall length of loosening body, and the diameter fluctuation scope of this significant part is less than 4%.
Press such scheme, described high-purity heavy wall silica tube inner bore surface roughness is less than or equal to 20 μ m, and hydroxy radical content is less than or equal to 100ppb, and external diameter is 1.5 ~ 1.8 with the ratio of diameter of bore.
Press such scheme, described preform diameter D is 120 ~ 200mm.
Press such scheme, described optical fiber prefabricating nose is processed through fused biconical taper, makes the optical fiber prefabricating nose coning or the approximate circle taper, and conical height H is 0.2 ~ 1.1 with the ratio H/D of preform diameter D, is 0.3 ~ 0.4 than the ratio of greater inequality value.
Press such scheme, outside vapour deposition process deposition SiO
2The transparent optical fibers prefabricated rods that sinters into behind the surrounding layer except the tapering for the diameter fluctuation of significant part less than 1mm.
Beneficial effect of the present invention is: the advantage that 1, combines VAD method and OVD method, wherein the VAD sedimentation rate is moderate, be easy to control the hydroxy radical content in the prefabricated rods, can obtain maximum fiber core layer material weight, OVD method sedimentation rate is the highest, and preparation requires lower surrounding layer part so that the prefabricated rods cost.Be set with fusion process with the heavy wall silica tube and avoided both shortcomings, not only the production efficiency of Effective Raise preform reduces cost, and processing performance is stable, and the fiber optics parameter is excellent, is convenient to large-scale production; 2, the covering of transparent solid quartz pushrod/sandwich layer diameter is controlled at 1.8 ~ 3 than (b/a), adopt simultaneously the mode of high-purity heavy wall quartz sleeve thickness of pipe, although the molten contracting operation of many together suits, but can obtain more sandwich layer glass weight, avoid the hydroxyl diffusion to introduce the core covering of transparent solid quartz pushrod, so that final preform can weigh 70 kilograms, obtain the large-scale optical fiber prefabricating stick of better quality; 3, Wire Drawing time and materials cost can have further been saved in the shaping of preform front end tapering.The technical solution used in the present invention has been avoided tiretube process and has been prepared operation in the middle of optical fiber many, and that the preform manufacturing cost is down to is minimum.
Description of drawings
Fig. 1 is preform preparation method's of the present invention process flow diagram.
Fig. 2 is the axial sectional structure synoptic diagram of preform of the present invention, the sandwich layer part of 1 expression VAD method deposition, the clad section of 2 expression VAD method depositions, silica glass member corresponding to 3 expression thick-walled tubes, the silica glass member of 4 expression OVD method deposition preparations.The diameter of D value representation the finished product preform, H represents the height of prefabricated rods cone.
Fig. 3 is the radially sectional structure synoptic diagram of preform of the present invention, and a among the figure and b represent respectively sandwich layer and clad section diameter, the diameter of D value representation the finished product preform.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
The present invention is suitable for preparing large-scale preformod of optical fiber with low water peak, composition (the Ge of unstripped gas is set in described VAD method, F, Cl) can obtain the silica glass that various doping form, in thick-walled tube, mix F, Cl, P etc. and can obtain different melt viscosity and specific refractory power, thereby can adjust the refractive index profile structure (RIP) of preform, this is apparent to those skilled in the art.Hereinafter in conjunction with several typical large prefabricated optical fiber bar manufacture method technical solution of the present invention is specifically described.
Embodiment one: matched cladding low water peak single mode fiber prefabricated rods.
Prepare the transparent solid quartz pushrod with VAD, comprise sandwich layer and part covering, the loosening body of VAD preparation is through changing transparent stuffed quartz rod into after the dehydration sintering, then carry out Shape correction, covering/sandwich layer diameter is 2.9 ~ 3 than b/a after this transparent solid quartz pushrod shaping, significant part length reaches 2/3 of total length, and significant part diameter fluctuation scope is less than 4%, and transparent solid quartz pushrod surfaceness is less than 20 μ m.Be a quartz pushrod with this quartz pushrod and external diameter 45mm, internal diameter 28mm, inside surface roughness less than molten the shortening into of high-purity heavy wall silica tube suit of 20 μ m, obtain the elementary preform of even structure, the hydroxy radical content of this thick-walled tube is less than 100ppb.As the target rod, deposit SiO with outside method (OVD) with this preform
2Surrounding layer after deposition is finished, sinters it transparent optical fibers prefabricated rods of diameter 120mm into.The rear end of this prefabricated rods connects extension tube as drawing wire machine feeder clamping, front end is the end that suspends, start for ease of wire drawing, this end that suspends is shaped to the approximate circle taper through fused biconical taper and by grinding and polishing, and the ratio H/D of the height of cone and prefabricated rods diameter is 1.1.Afterwards this preform drawing is become matches criteria covering low water peak single mode fiber, the continuous about 1000km of effective length of string, optical fiber is 0.268dB/km at the reduction coefficient of 1383nm window.
Embodiment two: the covering single-mode fiber prefabricated rods of sinking.
Prepare the transparent solid quartz pushrod with VAD, comprise sandwich layer and part covering, this covering contains F, and covering/sandwich layer diameter is 2.4 than b/a after this transparent solid quartz pushrod shaping.It is a quartz pushrod that this quartz pushrod and external diameter 45mm, internal diameter 28mm, inside surface roughness are fused into less than high-purity heavy wall silica tube suit of 20 μ m, obtains the elementary preform of even structure, and the hydroxy radical content of this thick-walled tube is less than 100ppb.As the target rod, deposit SiO with outside method (OVD) with this preform
2Surrounding layer after deposition is finished, sinters it transparent optical fibers prefabricated rods of diameter 150mm into.This prefabricated rods one end is started for ease of wire drawing for the end that suspends, and this end that suspends is shaped to the approximate circle taper through fused biconical taper and by grinding and polishing, and the ratio of the height of cone and bottom surface diameter is 0.2.Afterwards this preform drawing is become the standard covering low water peak single mode fiber that sink, the continuous about 1400km of effective length of string, optical fiber is 0.274dB/km at the reduction coefficient of 1383nm window.
Embodiment three: low water peak bend resistant single moded fibers prefabricated rods.
Prepare the transparent solid quartz pushrod with VAD, comprise sandwich layer and part covering, cored is 1.8 than b/a after this transparent solid quartz pushrod shaping.Molten the shortening into of high-purity heavy wall silica tube suit that this quartz pushrod and external diameter 50mm, internal diameter 30mm, inside surface roughness is less than or equal to 20 μ m is a quartz pushrod, obtain the elementary preform of even structure, this thick-walled tube contains F and hydroxy radical content less than 50ppb.As the target rod, deposit SiO with outside method (OVD) with this preform
2Surrounding layer, after deposition was finished, with its transparent optical fibers prefabricated rods that sinters diameter 200mm into, the diameter fluctuation of its significant part was less than 1mm.This prefabricated rods one end is the end that suspends, and this end that suspends is shaped to the approximate circle taper through fused biconical taper and by grinding and polishing, and the ratio of the height of cone and bottom surface diameter is 0.3 ~ 0.4.Apparently, this prefabricated rods also can be carried out melting, stretching, grinding, polishing, chemolysis, cleaning Shape correction as required in order to satisfy the requirement of fiber drawing furnace cavity internal diameter.Afterwards this preform is carried out wire drawing and make the counter-bending single-mode fiber in low water peak, the continuous about 2400km of effective length of string, optical fiber is 0.277dB/km at the reduction coefficient of 1383nm window, and additional macrobending loss is 0.08dB under the condition of 1550nm window 10mm diameter 1 circle.
Claims (9)
1. the preparation method of a large-scale optical fiber prefabricating stick is characterized in that comprising the steps:
Adopt the axial vapor deposition method and prepare the transparent solid quartz pushrod through subsequent disposal, described transparent solid quartz pushrod comprises sandwich layer and part covering; The transparent solid quartz pushrod is set in high-purity heavy wall silica tube shortens the uniform elementary preform of a root architecture into by high temperature melting; As the target rod, deposit SiO with outside vapour deposition process with this elementary preform
2Surrounding layer after deposition is finished, sinters it into transparent preform.
2. the preparation method of large-scale optical fiber prefabricating stick according to claim 1, it is characterized in that described transparent solid quartz pushrod covering/the sandwich layer diameter is 1.8 ~ 3 than b/a.
3. the preparation method of large-scale optical fiber prefabricating stick according to claim 1 and 2, the subsequent disposal that it is characterized in that described axial vapor deposition method is that the loosening body that the axial vapor deposition method is made is excellent through changing transparent stuffed quartz into after the dehydration sintering, then carry out Shape correction, comprise melting, stretching, grinding, polishing, chemolysis, cleaning, make its diameter even, any surface finish, transparent solid quartz pushrod surfaceness is less than or equal to 20 μ m.
4. the preparation method of large-scale optical fiber prefabricating stick according to claim 3, it is characterized in that the standby loosening body of described axial vapor deposition legal system is significant part along 2/3 the part of surpassing that the useful length of axis direction accounts for the axial overall length of loosening body, the diameter fluctuation scope of this significant part is less than 4%.
5. the preparation method of large-scale optical fiber prefabricating stick according to claim 3, it is characterized in that described high-purity heavy wall silica tube inner bore surface roughness is less than or equal to 20 μ m, hydroxy radical content is less than or equal to 100ppb, and external diameter is 1.5 ~ 1.8 with the ratio of diameter of bore.
6. the preparation method of large-scale optical fiber prefabricating stick according to claim 1 and 2 is characterized in that described preform diameter D is 120 ~ 200mm.
7. the preparation method of large-scale optical fiber prefabricating stick according to claim 6, it is characterized in that described optical fiber prefabricating nose processes through fused biconical taper, make the optical fiber prefabricating nose coning or be similar to taper shape, conical height H is 0.2 ~ 1.1 with the ratio H/D of preform diameter D.
8. the preparation method of large-scale optical fiber prefabricating stick according to claim 7 is characterized in that conical height H and the ratio H/D of preform diameter D are 0.3 ~ 0.4.
9. the preparation method of large-scale optical fiber prefabricating stick according to claim 7 is characterized in that: outside vapour deposition process deposition SiO
2The transparent optical fibers prefabricated rods that sinters into behind the surrounding layer except the tapering for the diameter fluctuation of significant part less than 1mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109081575A (en) * | 2017-06-14 | 2018-12-25 | 中天科技精密材料有限公司 | Preform and its manufacturing method |
| CN112279504A (en) * | 2020-11-30 | 2021-01-29 | 江苏亨通光导新材料有限公司 | Preparation device and preparation method of optical fiber preform |
| CN113998880A (en) * | 2021-10-08 | 2022-02-01 | 富通集团（嘉善）通信技术有限公司 | Manufacturing method of core rod, preform rod and optical fiber |
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| CN1760150A (en) * | 2005-08-17 | 2006-04-19 | 长飞光纤光缆有限公司 | Method for preparing preformod of optical fiber with low water peak in large size |
| CN1765789A (en) * | 2005-09-15 | 2006-05-03 | 长飞光纤光缆有限公司 | Method for making low water peak optical fiber preformrod adopting plasm outward spraying method |
| CN102276145A (en) * | 2011-07-12 | 2011-12-14 | 成都富通光通信技术有限公司 | Manufacturing method of optical fiber perform with uniform optical waveguide axial direction |
| CN102757179A (en) * | 2012-08-02 | 2012-10-31 | 长飞光纤光缆有限公司 | Method for preparing large-size optical fiber preform |
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- 2012-11-05 CN CN201210435105.0A patent/CN102923942B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760150A (en) * | 2005-08-17 | 2006-04-19 | 长飞光纤光缆有限公司 | Method for preparing preformod of optical fiber with low water peak in large size |
| CN1765789A (en) * | 2005-09-15 | 2006-05-03 | 长飞光纤光缆有限公司 | Method for making low water peak optical fiber preformrod adopting plasm outward spraying method |
| CN102276145A (en) * | 2011-07-12 | 2011-12-14 | 成都富通光通信技术有限公司 | Manufacturing method of optical fiber perform with uniform optical waveguide axial direction |
| CN102757179A (en) * | 2012-08-02 | 2012-10-31 | 长飞光纤光缆有限公司 | Method for preparing large-size optical fiber preform |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109081575A (en) * | 2017-06-14 | 2018-12-25 | 中天科技精密材料有限公司 | Preform and its manufacturing method |
| CN112279504A (en) * | 2020-11-30 | 2021-01-29 | 江苏亨通光导新材料有限公司 | Preparation device and preparation method of optical fiber preform |
| CN112279504B (en) * | 2020-11-30 | 2023-09-26 | 江苏亨通光导新材料有限公司 | Preparation device and preparation method of optical fiber preform |
| CN113998880A (en) * | 2021-10-08 | 2022-02-01 | 富通集团（嘉善）通信技术有限公司 | Manufacturing method of core rod, preform rod and optical fiber |
| CN113998880B (en) * | 2021-10-08 | 2023-02-24 | 富通集团（嘉善）通信技术有限公司 | Manufacturing method of core rod, preform rod and optical fiber |
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