CN1176866C - Optical fiber drawing apparatus and method which can minimize transmission loss - Google Patents
Optical fiber drawing apparatus and method which can minimize transmission lossInfo
- Publication number
- CN1176866C CN1176866C CNB961126612A CN96112661A CN1176866C CN 1176866 C CN1176866 C CN 1176866C CN B961126612 A CNB961126612 A CN B961126612A CN 96112661 A CN96112661 A CN 96112661A CN 1176866 C CN1176866 C CN 1176866C
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- mentioned
- annealing device
- uncoated
- equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/03—Drawing means, e.g. drawing drums ; Traction or tensioning devices
- C03B37/032—Drawing means, e.g. drawing drums ; Traction or tensioning devices for glass optical fibres
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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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02718—Thermal treatment of the fibre during the drawing process, e.g. cooling
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/0253—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/55—Cooling or annealing the drawn fibre prior to coating using a series of coolers or heaters
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/56—Annealing or re-heating the drawn fibre prior to coating
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses to methods and devices for producing optical fibers which can minimize the reduction of signals. The method of drawing optical fibers includes the following step: drawing of uncoated optical fiber with continuous monitoring and regulation of diameter of uncoated optical fiber; continuous cooling of hot uncoated optical fiber; forced cooling of uncoated optical fiber; application of coating from acrylic or silicon resin to surface of uncoated optical fiber upon leaving the cooling section; hardening of optical fiber with coating and winding of coated fiber on bobbin.
Description
Present invention relates in general to optical fiber, relate in particular to the equipment of drawing optical fiber, and when the large diameter preform of drawing is optical fiber, additional transmission loss can be reduced to minimum method.
As fibre-optical drawing equipment the application,, in fact be introduced into for referencial use at this based on Korean application No.33103/1995 with the method that transmission loss can be reduced to minimum.
Fig. 1 represents the sketch according to the drawing optical fiber equipment of prior art.
Preform 10 by the position control mechanism in the prefabricated rods positioner, is supplied to process furnace 12 lentamente.Temperature in the process furnace 12 is generally thousands of degree Celsius, is 2100-2200 ℃ in typical case.The optical fiber 23 of no overlay is to pull out from spinning nozzle by the power that sheave 26 applies.External diameter monitoring device 14 is used for determining whether the external diameter of this uncoated optical fiber 23 meets (being generally 125 μ m) with preset value, send its result to the diameter controller subsequently.The diameter controller is then controlled sheave 26, remains on 125 μ m with the diameter with uncoated optical fiber 23.Sheave 26 responds from the control signal of diameter controller and rotates, so that the pulling force that is added on the uncoated optical fiber 23 is regulated.Applying device is for acrylic resin or the silicone resin of descending uncoated optical fiber 23 coatings with protectiveness.Optical fiber 24 after the coating is hardened in post bake device 22.Cated optical fiber 24 by pulling out from the pulling force of sheave 26 is wrapped in above the reel 28.
In above-mentioned technological process, at first, large diameter prefabricated rods 10 is to be melted in the process furnace with temperature more than 2000 ℃, and is drawn into the uncoated optical fiber of 125 μ m diameters.In order to safeguard easily and prevent uncoated optical fiber 23 that this uncoated optical fiber 23 will apply by applying device 20 owing to water reduces its physical strength to its surface etching.In this technological process, the temperature of uncoated optical fiber 23 should be below 80 ℃ before it is about to coating, and preferably at 40-50 ℃, so that keep uniform diameter, and prevent to produce air filled cavity between the surface of overlay and uncoated optical fiber 23.Yet the uncoated optical fiber 23 that has just come out from process furnace 12 is very hot, usually more than 1600 ℃.The optical fiber 23 of this uncoated cools down naturally by air, needs to work as it apart from outside the process furnace certain distance.In addition, when the optical fiber 23 of uncoated during apart from the process furnace certain distance, its surface temperature variable gradient has a detailed description (referring to " Journal of Lightwave Technology " in " high-speed, high strength optical fiber draws " literary composition, Vol.LT-4,1986.10.8).
When the optical fiber 23 of uncoated pulled out from process furnace with the speed of 5 meter per seconds, for the surface with uncoated optical fiber 23 cools down to about 50 ℃, the distance between process furnace 12 and the applying device 20 should be about 800cm.This just makes the height of drawing optical fiber equipment very high.Therefore the manufacturing cost of optical fiber uprises, and its efficient is reduced.
Be head it off, U.S. Patent No. 4,437,870 describe a kind of pressure cooling optical fibers technology in detail, and this is by placing refrigerating unit 18 realizations at process furnace 12 and 20 of applying devices.
Aforesaid method can make the distance between process furnace and the applying device reduce, thereby reduces manufacturing cost.Yet, because the optical fiber 23 of uncoated causes bigger stress in the process of cooling rapidly under surpassing 1600 ℃ high temperature, thus the coating optic fibre 24 that draws out, its physical strength step-down, and its transmission loss increases.
Particularly when preform be when using the synthetic quartz pipe to utilize improved chemical vapor deposition (being referred to as MCVD subsequently) method to draw, this will cause transmission loss.The draw rate of uncoated optical fiber 23 is fast more, and transmission loss is big more.To have the large diameter prefabricated rods 10 of low-loss diameter in order producing, should to use highly purified synthetic quartz pipe greater than 40mm.Yet use this synthetic quartz pipe to be restricted, because exist added losses in the process of drawing uncoated optical fiber 23.
The object of the present invention is to provide the equipment of drawing optical fiber, and can draw and use the synthetic quartz pipe, utilize the large-diameter optical fiber prefabricated stick that the MCVD method makes and do not have the method for transmission loss.
Another object of the present invention, even the method that is fibre-optical drawing equipment is provided He can prevents the additional transmitted loss is when draw rate increases.
Another object of the present invention, the method that is to provide the equipment of drawing optical fiber and can reduces manufacturing cost.
Also has another purpose, the method that is to provide the equipment of drawing optical fiber and can prevents from optical fiber, to cause stress owing to the quick cooling of refrigerating unit.
Also has another purpose, the method that is to provide the equipment of drawing optical fiber and there is no the installing space limitation.
The present invention is another purpose further, the method that is to provide the equipment of drawing optical fiber and can increases mechanical fiber optic intensity.
Further object of the present invention is to provide the equipment of drawing optical fiber and by making the method that low-cost optical fiber improves its practicality.
In order to reach above-mentioned these purposes, realize that the method for drawing optical fibers of above listed purpose comprises the steps: will to be melted by the large diameter preform that silicon-dioxide is made in process furnace, and draw out the optical fiber that does not have coating; Cool off gradually with the uncoated optical fiber of annealing device for the heat of coming out in the outside diameter measuring device; With refrigerating unit the uncoated optical fiber that is come out by annealing device is forced cooling; With surface applied acrylic resin or the silicone resin of applying device for uncoated optical fiber; Make coated optical fiber sclerosis with the post bake device, and the coated optical fiber by sheave is wrapped on the reel.
The equipment of realizing the listed goal of the invention of prosthomere comprises: insert inner silica tube, when allowing optical fiber by annealing device to prevent to produce dust; Be installed in silica tube many electric radiation elements on every side; Be installed in the thermopair in the gap between hot radiant element and the silica tube, so that the temperature of electric radiation element internal is monitored; Be installed in the heat insulating element of hot radiant element periphery, transmit to external world to prevent the heat that the electric radiation element produces; One annulation, the protection heat insulating element is avoided ectocine; Control device is to carry out control and monitoring to the temperature in the annealing device; And the carriage that is installed in annealing device top and bottom, so that silica tube and outer tube are fixed together.
These and other various performances and advantage of the present invention will be more readily understood with reference to the detailed description of doing below in conjunction with accompanying drawing, wherein
Fig. 1 is the sketch of expression according to the drawing optical fiber equipment of prior art;
Fig. 2 is the sketch of expression according to drawing optical fiber equipment of the present invention, and
Fig. 3 is the sectional view of the annealing device in the expression drawing optical fiber equipment of the present invention.
Accompanying drawing with reference to appended will be described in detail most preferred embodiment of the present invention.
Fig. 2 is according to drawing optical fiber apparatus sketch of the present invention, and it is minimum that this equipment can reduce to additional transmission loss.With reference to Fig. 2, will be described in detail the fibre-optical drawing technological process.
First step is, by preform being heated to above 2000 ℃ temperature in process furnace 12, drawing out diameter is the uncoated optical fiber 23 of 125 μ m.Second step be, calipers 14 places outside, and the diameter of monitoring and control uncoated optical fiber 23 is so that produce the have homogeneous diameter uncoated optical fiber of (125 μ m).The 3rd step is to cool off the hot optical fiber from the uncoated of outside diameter measuring device gradually at the annealing device place, till its surface temperature reaches below 800 ℃.The temperature controlling range of annealing device is between 25-1200 ℃.When preform 10 was pulled out from process furnace with the speed of 5 meter per seconds, the Heating temperature of annealing device was 1100 ℃.The 4th step be, makes the uncoated optical fiber 23 that is cooled to gradually below 800 ℃ force cooling at refrigerating unit 18 places, reaches till about 50 ℃ until its surface temperature.The 5th step be, at applying device 20 places, for the surface applied of the uncoated optical fiber 23 that comes self-cooling set 18 with acrylic resin or silicone resin.The 6th step is optical fiber 24 sclerosis after post bake device 22 places make coating.The 7th step is to be wrapped on the reel by the optical fiber of sheave 26 with coating.According to the coating optic fibre that aforesaid method pulls out, under the 1310nm wavelength, have and be about 0.33 decibel/kilometer transmission loss.
Fig. 3 is in the drawing optical fiber equipment of the present invention, the sectional view of annealing device 16.Be used for cooling off gradually annealing device 16 from the uncoated optical fiber 23 of process furnace 12, its length is greater than 200 millimeters, and it comprises: silica tube 34, and its internal diameter and length are respectively 25mm and 200mm, insert inside, allow the optical fiber 23 of uncoated can pass through annealing device 16 to prevent to produce dust; Be installed in silica tube 34 many electric radiation elements 42 on every side; Be installed in the hot radiant element 42 of bottom and the thermopair 40 between the silica tube 34, so that the temperature of hot radiant element 42 is monitored; Be installed in the heat insulating element 44 of hot radiant element 42 peripheries, transmit to external world from the radiant heat of hot radiant element preventing; By the outer tube 36 that stainless steel is made, avoid ectocine in order to protection heat insulating element 44; Be installed in the control device 38 of annealing device 16 1 sides, annealing device 16 temperature inside are controlled in 25 ℃-1200 ℃ the scope; And the carriage 32 that is installed in annealing device 16 upper and lowers, so that both are fixed together with silica tube 34 and pipe 36.
In annealing device 16, silica tube 34 is by the radiant heat heating from uncoated optical fiber 23, yet uncoated optical fiber 23 comes out from process furnace 12 under the temperature more than 1600 ℃ just.The heat of annealing device 16 inside is not easy to spill into the external world, because be installed in the heat insulating element 44 that constitutes between outer field pipe 36 and the silica tube 34, can prevent heat passage effectively.According to the present invention, the internal diameter of silica tube 34 is preferably greater than 5mm, but less than 50mm.
Equipment of the present invention is to effective especially by the preform drawing optical fiber that uses the synthetic quartz pipe to utilize the MCVD method to make.Even adopt higher draw rate to make optical fiber, also additional transmission loss can not occur.And because the speed of drawing optical fiber is higher, so its manufacturing cost reduction, thus its practicality improved.And the stress that optical fiber also causes less than the pressure process of cooling by annealing device.Based on equipment of the present invention, for it needed space is installed and there is no limitation.The optical fiber of Sheng Chaning thus, its physical strength is high.
Therefore, be to be understood that, the present invention is not limited to expection as implementing best way of the present invention specific embodiments disclosed herein, and this is just because of the specific examples of describing in the present invention is not limited thereto the specification sheets, unless as outside limiting in the appended claims.
Claims (8)
1. the method for a drawing optical fiber comprises the steps:
In process furnace, make large diameter silica optical fiber prefabricated rods fusing, and draw out the optical fiber of uncoated;
By annealing device, the uncoated optical fiber that is come out by above-mentioned process furnace is cooled off gradually, till its surface temperature was at least to 800 ℃, above-mentioned annealing device had a plurality of electric radiation elements;
By refrigerating unit, make the above-mentioned uncoated optical fiber that comes out by above-mentioned annealing device force cooling, till its surface temperature is at least to 50 ℃;
By applying device, for the surface applied of above-mentioned uncoated optical fiber with acrylic resin or silicone resin;
By the post bake device, make the above-mentioned optical fiber sclerosis that has applied, and
Above-mentioned coating optic fibre by sheave is wrapped on the reel.
2. according to the process of claim 1 wherein that the temperature controlling range of described annealing device is from 25 ℃ to 1200 ℃.
3. according to the process of claim 1 wherein that when above-mentioned uncoated optical fiber was heated and draws, the Heating temperature of above-mentioned annealing device was 1100 ℃ in above-mentioned process furnace.
4. the equipment of a drawing optical fiber, it comprises and is used for making the optical fiber that comes out in process furnace refrigerative annealing device gradually before entering the refrigerating unit of forcing cooling usefulness that wherein said annealing device comprises:
Insert the silica tube of above-mentioned annealing device inside, allow above-mentioned optical fiber can pass through above-mentioned annealing device to prevent to produce dust;
Be installed in above-mentioned silica tube many electric radiation elements on every side;
Be installed in the thermopair in the gap between above-mentioned hot radiant element and the above-mentioned silica tube, monitor with temperature to above-mentioned hot radiant element;
Be installed in above-mentioned hot radiant element heat insulating element on every side, transmit to the external world to prevent the heat that above-mentioned electric radiation element produces;
Be used to protect above-mentioned heat insulating element to avoid the pipe of ectocine;
The control device that is installed in annealing device one side and links with above-mentioned thermopair is controlled and monitoring so that the internal temperature of above-mentioned annealing device is carried out, and
Be installed in the carriage of above-mentioned annealing device top and bottom, so that above-mentioned silica tube and above-mentioned outer tube are fixed together.
5. according to the equipment of claim 4, wherein said annealing device equals or is longer than 200mm.
6. according to the equipment of claim 4, the internal diameter of wherein said silica tube is greater than 5mm, but less than 50mm.
7. according to the equipment of claim 4, wherein said outer tube is made by stainless steel.
8. according to the equipment of claim 4, wherein said control device is controlled at temperature in the scope between 25 ℃ and 1200 ℃.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950033103A KR0150154B1 (en) | 1995-09-29 | 1995-09-29 | Method and apparatus for drawing optical glass fiber |
| KR33103/1995 | 1995-09-29 | ||
| KR33103/95 | 1995-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1156696A CN1156696A (en) | 1997-08-13 |
| CN1176866C true CN1176866C (en) | 2004-11-24 |
Family
ID=19428671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB961126612A Expired - Fee Related CN1176866C (en) | 1995-09-29 | 1996-09-27 | Optical fiber drawing apparatus and method which can minimize transmission loss |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2944534B2 (en) |
| KR (1) | KR0150154B1 (en) |
| CN (1) | CN1176866C (en) |
| RU (1) | RU2128630C1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247477C (en) * | 1999-05-27 | 2006-03-29 | 住友电气工业株式会社 | Production device and method for optical fiber |
| JP4482954B2 (en) * | 1999-05-27 | 2010-06-16 | 住友電気工業株式会社 | Optical fiber manufacturing method |
| FR2803287B1 (en) * | 1999-12-30 | 2002-05-31 | Cit Alcatel | METHOD FOR COOLING AN OPTICAL FIBER DURING FIBRATION |
| FR2803288B1 (en) * | 1999-12-30 | 2002-03-29 | Cit Alcatel | METHOD FOR COOLING AN OPTICAL FIBER DURING FIBRATION |
| CN1289422C (en) * | 2001-11-20 | 2006-12-13 | 王胜国 | Optic fibre of controlling robust diameter in drawing optic fibre |
| JP3753975B2 (en) * | 2001-11-29 | 2006-03-08 | 株式会社フジクラ | Single-mode optical fiber manufacturing method and single-mode optical fiber |
| US7565820B2 (en) | 2002-04-30 | 2009-07-28 | Corning Incorporated | Methods and apparatus for forming heat treated optical fiber |
| CN101143762B (en) * | 2006-09-13 | 2012-01-25 | 乔治洛德方法研究和开发液化空气有限公司 | Gas control device and corresponding method for recovering coolant gases in a fiber coolant system |
| DK2557070T3 (en) * | 2006-11-28 | 2015-08-17 | Corning Inc | A process for the manufacture of optical fibers by drawing |
| US8074474B2 (en) | 2007-11-29 | 2011-12-13 | Corning Incorporated | Fiber air turn for low attenuation fiber |
| FI125020B (en) * | 2012-05-14 | 2015-04-30 | Nextrom Oy | Hardware |
| US10322963B2 (en) * | 2014-12-02 | 2019-06-18 | Corning Incorporated | Low attenuation optical fiber |
| CN104597560A (en) * | 2015-01-12 | 2015-05-06 | 江苏通鼎光电股份有限公司 | Small outer diameter and low loss fiber for air blowing micro cable and manufacture method thereof |
-
1995
- 1995-09-29 KR KR1019950033103A patent/KR0150154B1/en not_active IP Right Cessation
-
1996
- 1996-09-27 CN CNB961126612A patent/CN1176866C/en not_active Expired - Fee Related
- 1996-09-27 RU RU96119846A patent/RU2128630C1/en not_active IP Right Cessation
- 1996-09-30 JP JP8259240A patent/JP2944534B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1156696A (en) | 1997-08-13 |
| KR970015502A (en) | 1997-04-28 |
| JP2944534B2 (en) | 1999-09-06 |
| RU2128630C1 (en) | 1999-04-10 |
| JPH09142890A (en) | 1997-06-03 |
| KR0150154B1 (en) | 1998-10-15 |
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