CN104445918A - Method for reducing loss of optical fiber - Google Patents
Method for reducing loss of optical fiber Download PDFInfo
- Publication number
- CN104445918A CN104445918A CN201410695256.9A CN201410695256A CN104445918A CN 104445918 A CN104445918 A CN 104445918A CN 201410695256 A CN201410695256 A CN 201410695256A CN 104445918 A CN104445918 A CN 104445918A
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- CN
- China
- Prior art keywords
- cooling
- optical fiber
- loss
- cooling cylinder
- pipeline
- 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.)
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Classifications
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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
- C03B37/10—Non-chemical treatment
Abstract
The invention provides a method for reducing loss of an optical fiber, and relates to a manufacturing method of an optical fiber product. The method for reducing the loss of the optical fiber comprises the following steps: cooling a bare optical fiber obtained by drawing a prefabricated rod by using a cooling system, wherein the cooling system comprises a plurality of cooling barrels; a pipeline for conveying cooling gas and enabling the optical fiber to move is arranged in the cooling barrels; cooling water is filled between the cooling barrels and the pipeline; from top to bottom, the inlet water temperatures of the cooling barrels decrease sequentially. The method for reducing the loss of the optical fiber is simple and low in cost; by the method, the loss of the optical fiber can be significantly reduced.
Description
Technical field
The present invention relates to the manufacture method of fiber products, particularly relate to the method reducing fibre loss.
Background technology
The loss of optical fiber is the salient features of Optical Fiber Transmission, and the large transmission range of loss is short, therefore in order to reduce the usage quantity of relay station, just must reduce the loss of optical fiber, and the loss of optical fiber is divided into intrinsic loss and manufactures loss.
Intrinsic loss refers to a kind of loss that fiber optic materials is intrinsic, is unavoidable, which determines the loss limit of fiber Rayleigh scattering.The loss that comprise the intrinsic loss of the silica fibre Intrinsic Gettering of optical fiber and Rayleigh scattering cause.Fiber manufacturing loss produces in the technological process manufacturing optical fiber, causes primarily of the absorption (Impurity Absorption) of composition impure in optical fiber and the textural defect of optical fiber.Affecting larger in Impurity Absorption is the loss of the light that various transition metal ion and OH-ion cause.Wherein the impact of OH-ion is larger, and its absorption peak lays respectively at 950nm, 1240mm and 1390nm, larger on opticfiber communication cable impact.Along with being gradually improved of optic fibre manufacture process, the impact of transition metal is not remarkable, and best technique can make OH-ion be reduced to 0.04dB/km in the loss at 1390nm place, even little of negligible degree.The imperfection of optical fiber structure also can bring scatter loss, and mainly the crystalline structure of inside of optical fibre can have influence on the loss of optical fiber.Drawing process has significant impact to optical fiber structure.In drawing process, low-water-peak fiber was through the research and development of nearly 10 years, substantially qualitative, the loss reducing optical fiber is that present many optical fiber producers are all in the direction of endeavouring to study, existing documents and materials display, the velocity of flow that some producers improve gas in process furnace reduces the loss of optical fiber, and having plenty of increases an annealing device in exit and reduce the wastage, but the fibre loss obtained is still higher.
Summary of the invention
Main purpose of the present invention is to provide the method reducing fibre loss, and the method is simple, cost is low, significantly can reduce the low damage of optical fiber.
Object of the present invention adopts following technical scheme to realize.
Reduce the method for fibre loss, comprise the step bare fibre obtained after prefabricated stick drawn wire being adopted cooling system cooling, described cooling system comprises some cooling cylinders, pipeline for carrying cooling gas and optical fiber movement is set in described cooling cylinder, water coolant is passed between described cooling cylinder and pipeline, from top to bottom, the inflow temperature of cooling cylinder reduces successively.
In preferred technical scheme, the inflow temperature of cooling cylinder reduces successively with the gradient of 2-8 DEG C.
In preferred technical scheme, the number of described cooling cylinder is 4-8.
In preferred technical scheme, the temperature of described cooling cylinder water inlet is 9-31 DEG C.
The present invention reduces the method for fibre loss, simple, cost is low, significantly can reduce the low damage of optical fiber.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention, wherein 1-bare fibre, 2-first cooling cylinder, 3-junctor, 4-second and third, four, five cooling cylinders, 5-the 6th cooling cylinder, 7-helium entrance, 6-mould, 8-water coolant, 9-helium, 10-cooling water inlet, 11-cooling water outlet.
Embodiment
Composition graphs 1 is described the method manufacturing low loss fiber.
Obtain bare fibre by after prefabricated stick drawn wire, bare fibre carries out coating and obtains optical fiber after cooling system cooling.Cooling system comprises the junctor composition between some cooling cylinders and cooling cylinder, arranging the pipeline for carrying helium and optical fiber movement, passing into water coolant between cooling cylinder and pipeline in cooling cylinder.Bare fibre moves from top to bottom, and water coolant and helium flow from bottom to top.Each cooling cylinder is connected with a cooling-water machine, and the water coolant in cooling-water machine enters the space between cooling cylinder and pipeline from water-in, enters cooling-water machine again from water outlet.From top to bottom, the inflow temperature of cooling cylinder reduces successively.The gradient that the inflow temperature of cooling cylinder reduces successively is 2-3 DEG C.Helium gas flow 4-5L/min, inlet air temperature 20 ± 3 DEG C, optical fiber translational speed 1500m/min, cooling-water machine flow is 8 L/min.
Prefabricated rods is subject to the high-temperature fusion of more than 2000 DEG C in process furnace, come in the drop-down wire vent of the effect of straining pulley, cooling system needs to be cooled to about 50 DEG C from more than 2000 DEG C in a short period of time by by optical fiber wherein, so that application system work well, when optical fiber is by cooling cylinder, heat is passed to helium by optical fiber, and helium passes to cooling circulating water by cooling cylinder inwall, and heat passes in outside atmosphere by recirculated water under the effect of cooling-water machine.
6 cooling cylinders are set, be from top to bottom followed successively by first, second, third and fourth, five, six cooling cylinders.Cooling cylinder length is 1200mm, and the internal diameter of cooling cylinder interior conduit is 10mm.Change the temperature of each cooling cylinder recirculated water water inlet, the inflow temperature of cooling cylinder is arranged respectively to 25 DEG C, 22 DEG C, 19 DEG C, 16 DEG C, 14 DEG C, 12 DEG C from top to bottom.Cooling cylinder close to process furnace passes into the higher recirculated water of relative temperature, and the cooling cylinder away from process furnace passes into the lower recirculated water of temperature.The cooling cylinder that bare fibre is out introduced into relatively-high temperature from the process furnace of high temperature after air is inner, and along with optical fiber is downward, cooling cylinder temperature reduces gradually, reaches required lambda line temperature when optical fiber enters before application system.In top-down process of cooling, formed from top to bottom, the thermograde that reduces gradually of temperature, the process of cooling of optical fiber changes a process relatively slowly into, reaches the object cooling bare fibre gradually.The direction that we produce low loss fiber is exactly change optical fiber from heat to cold process, reduces the stress of inside of optical fibre, thus makes the average attenuation of optical fiber on 1550nm wavelength be less than 0.183dB/km.
The inflow temperature that control methods (ordinary method) adjusts each cooling cylinder is consistent, be 17 DEG C, other conditions are the same, because bare fibre temperature in the cooling cylinder gone up most sharply changes, the molecular structure of glass yarn easily sharply changes, the internal stress of bare fibre is increased, so the optical fiber attenuation obtained is higher, average attenuation is about 0.190dB/km.
Claims (4)
1. reduce the method for fibre loss, comprise the step bare fibre obtained after prefabricated stick drawn wire being adopted cooling system cooling, described cooling system comprises some cooling cylinders, pipeline for carrying cooling gas and optical fiber movement is set in described cooling cylinder, water coolant is passed between described cooling cylinder and pipeline, it is characterized in that from top to bottom, the inflow temperature of cooling cylinder reduces successively.
2. manufacture the method for low loss fiber according to claim 1, it is characterized in that the inflow temperature of cooling cylinder reduces successively with the gradient of 2-8 DEG C.
3. manufacture the method for low loss fiber according to claim 2, it is characterized in that the number of described cooling cylinder is 4-8.
4. manufacture the method for low loss fiber according to claim 3, it is characterized in that the temperature that described cooling cylinder is intake is 9-31 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410695256.9A CN104445918A (en) | 2014-11-27 | 2014-11-27 | Method for reducing loss of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410695256.9A CN104445918A (en) | 2014-11-27 | 2014-11-27 | Method for reducing loss of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104445918A true CN104445918A (en) | 2015-03-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410695256.9A Pending CN104445918A (en) | 2014-11-27 | 2014-11-27 | Method for reducing loss of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104445918A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1369447A (en) * | 2001-01-31 | 2002-09-18 | 株式会社藤仓 | Drawing process for optical fiber |
| JP2004043215A (en) * | 2002-07-09 | 2004-02-12 | Furukawa Electric Co Ltd:The | Method of manufacturing optical fiber |
| CN102272063A (en) * | 2009-04-16 | 2011-12-07 | 株式会社藤仓 | Method for manufacturing optical fiber wire |
| US20130312461A1 (en) * | 2009-10-28 | 2013-11-28 | Corning Incorporated | Method for cooling optical fiber |
-
2014
- 2014-11-27 CN CN201410695256.9A patent/CN104445918A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1369447A (en) * | 2001-01-31 | 2002-09-18 | 株式会社藤仓 | Drawing process for optical fiber |
| JP2004043215A (en) * | 2002-07-09 | 2004-02-12 | Furukawa Electric Co Ltd:The | Method of manufacturing optical fiber |
| CN102272063A (en) * | 2009-04-16 | 2011-12-07 | 株式会社藤仓 | Method for manufacturing optical fiber wire |
| US20130312461A1 (en) * | 2009-10-28 | 2013-11-28 | Corning Incorporated | Method for cooling optical fiber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 210038 No. 76, Xingang Avenue, Nanjing economic and Technological Development Zone, Nanjing, Jiangsu Applicant after: NANJING WASIN FUJIKURA OPTICAL COMMUNICATION LTD. Address before: 76 No. 210000 Jiangsu city of Nanjing province Nanjing economic and Technological Development Zone, Xingang Avenue Applicant before: Nanjing Fiberhome Fujikura Optical Communication Ltd. |
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| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
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| RJ01 | Rejection of invention patent application after publication |