CN110174724A - A kind of low-loss single-mode optical fiber and preparation method thereof - Google Patents
A kind of low-loss single-mode optical fiber and preparation method thereof Download PDFInfo
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- CN110174724A CN110174724A CN201910276169.2A CN201910276169A CN110174724A CN 110174724 A CN110174724 A CN 110174724A CN 201910276169 A CN201910276169 A CN 201910276169A CN 110174724 A CN110174724 A CN 110174724A
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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
- C03B37/0253—Controlling or regulating
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention discloses a kind of low-loss single-mode optical fiber of optical fiber preparation technical field and preparation method thereof, including fibre core, inner cladding and surrounding layer, the inner cladding is coated on the outside of the fibre core, the surrounding layer is coated on the outside of the inner cladding, drawing optical fibers: prefabricated rods are tucked into high temperature furnace and carry out wire drawing, prefabricated rods are pushed into high temperature furnace by extending tail pipe, it is blown by being mounted on the tracheae at the top of high temperature furnace to the parallel direction at the top of high temperature furnace, to being vacuumized in high temperature furnace, the present invention is blown by fire door of the tracheae to high temperature furnace, negative pressuren zone is formed at the top of fire door, by the oxygen extraction in high temperature furnace, reduce oxidation reaction, to reduce the infiltration of impurity, pass through cooling annealing steps three times, eliminate the stress in optical fiber, coating is uniformly coated by the coating die to match with optical fiber On the surface of optical fiber, the low-loss of optical fiber is effectively realized.
Description
Technical field
The present invention relates to optical fiber preparation technical field, specially a kind of low-loss single-mode optical fiber and preparation method thereof.
Background technique
Optical fiber is writing a Chinese character in simplified form for optical fiber, is a kind of fiber made of glass or plastics, can be used as light conduction tool.It passes
Defeated principle is " total reflection of light ".
Single mode optical fiber (SingleModeFiber): centre pane core is very thin (core diameter is generally 9 or 10 μm), can only pass one
The optical fiber of kind mode.Therefore, intermode dispersion very little is suitable for telecommunication, but there is also material dispersion and waveguide dispersion,
Single mode optical fiber has higher requirement to the spectrum width and stability of light source in this way, i.e. spectrum width wants narrow, and stability will be got well.It found again later
At 1.31 mum wavelengths, the material dispersion and waveguide dispersion one of single mode optical fiber are positive, one is negative, and size is also just equal.In this way,
1.31 mum wavelength areas are just at a highly desirable operation window of fiber optic communication, and the master of practical optical fiber telecommunications system now
The major parameter for wanting 1.31 μm of Standard single-mode fibers of service band is determined in G652 suggestion by International Telecommunication Union ITU-T
, therefore this optical fiber is also known as G652 optical fiber.
Optical fiber carries out high temperature melting to prefabricated rods in process of production, by high temperature furnace, under the effect of gravity by prefabricated rods
It is drawn into silk, by annealing, applying coating and winding, is being made optical fiber, in the preparation process of existing optical fiber, prefabricated rods are in height
In warm furnace when fusing, the graphite body in air and high temperature furnace in high temperature furnace is aoxidized, and can be penetrated into when prefabricated rods being caused to be melted
Impurity, and optical fiber, in annealing process, too fast cooling will lead to the concentration of the stress in optical fiber, the process of optical fiber coating coating
In, coating effectively can not uniformly be coated in the surface of optical fiber, the serious transmission loss for affecting optical fiber.
Summary of the invention
The purpose of the present invention is to provide a kind of low-loss single-mode optical fiber and preparation method thereof, to solve above-mentioned background technique
Air and high temperature furnace in the preparation process of the existing optical fiber of middle proposition, when prefabricated rods melt in high temperature furnace, in high temperature furnace
Interior graphite body aoxidizes, and can penetrate into impurity when prefabricated rods being caused to be melted, and optical fiber is in annealing process, too fast cooling
The stress that will lead in optical fiber is concentrated, and during optical fiber coating coating, coating effectively can not uniformly be coated in optical fiber
The problem of surface, the serious transmission loss for affecting optical fiber.
To achieve the above object, the invention provides the following technical scheme: a kind of low-loss single-mode optical fiber, including it is fibre core, interior
Covering and surrounding layer, the inner cladding are coated on the outside of the fibre core, and the surrounding layer is coated on the outside of the inner cladding.
Preferably, the fibre core is germanium-doped silica.
Preferably, the inner cladding is fluorine doped silica.
Preferably, the surrounding layer silica.
A kind of preparation method of low-loss single-mode optical fiber, the preparation method of the low-loss single-mode optical fiber include the following steps:
S1: drawing optical fibers: prefabricated rods being tucked into high temperature furnace and carry out wire drawing, and prefabricated rods are pushed into high temperature by extending tail pipe
In furnace, blown by being mounted on the tracheae at the top of high temperature furnace to the parallel direction at the top of high temperature furnace, it is true to carrying out taking out in high temperature furnace
It is empty；
S2: anneal for the first time: wire drawing draws optical fiber into the first annealing furnace after coming out of the stove, and is stained with aeroge in the first annealing furnace
Felt keeps the temperature the first annealing furnace by aerogel blanket, carries out slow cooling annealing to the optical fiber in the first annealing furnace；
S3: second anneals: the optical fiber after first time anneals being drawn into the second annealing furnace, is equipped in the second annealing furnace
Heater strip and temperature sensor, the outside blackout of the second annealing furnace have temperature control device, and temperature sensor is filled by conducting wire and temperature control
Connection is set, temperature control device is connect with heater strip by conducting wire, by the temperature in the second annealing furnace of temperature sensor measurement, passed through
Temperature control device controls the heating temperature of heater strip, and the temperature in the second annealing furnace is remained at perseverance by the heating of heater strip
Fixed temperature anneals to optical fiber by constant temperature；
S4: third time is annealed: the optical fiber after second is annealed being drawn into third annealing furnace, the installation of the second annealing furnace inner wall
There is graphite insulating tube, insulation annealing is carried out to optical fiber by graphite insulating tube；
S5: applying coating: the optical fiber after third time is annealed is drawn into coating die, and coating die is infundibulate, coating
The bottom part aperture diameter of mold and the diameter of optical fiber match, and are applied by the coating being contained in coating die to the surface of optical fiber
It covers；
S6: solidify: the optical fiber by coating is drawn to the paint solidification on curing interior focusing fibre；
S7: winding: the optical fiber after solidification is wound by winder.
Preferably, in the step S1, the temperature in high temperature furnace is 1900 DEG C -2200 DEG C.
Preferably, in the step S3, the temperature of the second annealing furnace is controlled at 1000 DEG C -1200 DEG C.
Preferably, in the step S5, the coating contained in coating die is epoxy acrylate or polyacrylate.
Preferably, in the step S6, curing is ultraviolet curing machine, and it is solid to carry out ultraviolet light to optical fiber by ultraviolet light
Change.
Compared with prior art, the beneficial effects of the present invention are: the present invention is blown by fire door of the tracheae to high temperature furnace
Gas forms negative pressuren zone at the top of fire door, the oxygen in high temperature furnace is extracted out, oxidation reaction is reduced, to reduce the infiltration of impurity
Enter, annealed by steps cooling three times, eliminate the stress in optical fiber, by the coating die that matches with optical fiber by coating
The uniform surface for being coated in optical fiber, effectively realizes the low-loss of optical fiber.
Detailed description of the invention
Fig. 1 is optical fiber structure schematic diagram of the present invention；
Fig. 2 is preparation method flow chart of the present invention；
Fig. 3 is high temperature furnace structural schematic diagram of the present invention.
In figure: 100 fibre cores, 200 inner claddings, 300 surrounding layers, 400 high temperature furnaces, 410 tracheaes, 420 fixing clamps.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of low-loss single-mode optical fiber, including fibre core 100, inner cladding 200 and surrounding layer
300, inner cladding 200 is coated on the outside of fibre core 100, and surrounding layer 300 is coated on the outside of inner cladding 200, and fibre core 100 is to mix germanium
Silica, inner cladding 200 are fluorine doped silica, 300 silica of surrounding layer.
Fig. 2 and Fig. 3 are please referred to, the present invention also provides a kind of preparation methods of low-loss single-mode optical fiber.
Embodiment
The preparation method of the low-loss single-mode optical fiber includes the following steps:
S1: drawing optical fibers: prefabricated rods being tucked into high temperature furnace 400 and carry out wire drawing, is pushed into prefabricated rods by extending tail pipe
In high temperature furnace 400, the top installation tracheae 410 and fixing clamp 420, fixing clamp 420 of high temperature furnace 400 are mounted by means of bolts on
Tracheae 410 is fixedly mounted on the top right side of high temperature furnace 400, tracheae by fixing clamp 420 by the top right side of high temperature furnace 400
The fire door flush of 410 left side gas outlet and the top of high temperature furnace 400, the right end of tracheae 410 are connected with air blower, pass through peace
Tracheae 410 mounted in 400 top of high temperature furnace is blown to the parallel direction at the top of high temperature furnace fire door, in 400 top furnace of high temperature furnace
Negative pressuren zone is formed at mouthful, the higher-pressure region air in high temperature furnace 400 extracts the oxygen in high temperature furnace 400 out to flowing at fire door, right
High temperature furnace 400 is vacuumized, and is aoxidized to reduce oxygen with the graphite body surface in high-temperature smelting pot 400, to reduce
Low-loss is effectively realized in the infiltration of impurity, and the temperature in high temperature furnace 400 is between 1900 DEG C -2200 DEG C；
S2: anneal for the first time: wire drawing draws optical fiber into the first annealing furnace after coming out of the stove, and is stained with aeroge in the first annealing furnace
Felt keeps the temperature the first annealing furnace by aerogel blanket, slow cooling annealing is carried out to the optical fiber in the first annealing furnace, by light
Fine temperature is reduced to 1500 DEG C or so from 2000 DEG C or so of temperature, and annealing time is at 7-10 seconds；
S3: second anneals: the optical fiber after first time anneals being drawn into the second annealing furnace, is equipped in the second annealing furnace
Heater strip and temperature sensor, the outside blackout of the second annealing furnace have temperature control device, and temperature sensor is filled by conducting wire and temperature control
Connection is set, temperature control device is connect with heater strip by conducting wire, by the temperature in the second annealing furnace of temperature sensor measurement, passed through
Temperature control device controls the heating temperature of heater strip, and the temperature in the second annealing furnace is remained at perseverance by the heating of heater strip
Fixed temperature anneals to optical fiber by constant temperature, and the temperature in the second annealing furnace is maintained between 1000 DEG C -1200 DEG C, is moved back
The fiery time is 4-7 seconds；
S4: third time is annealed: the optical fiber after second is annealed being drawn into third annealing furnace, the installation of the second annealing furnace inner wall
Have graphite insulating tube, by graphite insulating tube to optical fiber carry out insulation annealing, by the temperature of optical fiber be reduced to 100 degrees Celsius with
Under, by annealing steps three times, the stress in optical fiber is eliminated, effectively realizes the low-loss of optical fiber；
S5: applying coating: the optical fiber after third time is annealed is drawn into coating die, and coating die is infundibulate, coating
The bottom part aperture diameter of mold and the diameter of optical fiber match, and are applied by the coating being contained in coating die to the surface of optical fiber
It covers, coating is coated uniformly on the surface of optical fiber by the aperture to be matched by the diameter of coating die bottom and optical fiber, effectively real
The low-loss of existing optical fiber；
S6: solidify: the optical fiber by coating draws to the coating on ultraviolet curing machine interior focusing fibre and carries out ultraviolet curing；
S7: winding: the optical fiber after solidification is wound by winder.
In summary, blowing by fire door of the tracheae to high temperature furnace, negative pressuren zone is formed at the top of fire door, it will
Oxygen extraction in high temperature furnace, reduces oxidation reaction, to reduce the infiltration of impurity, is annealed by cooling steps three times,
The stress in optical fiber is eliminated, coating is uniformly coated in the surface of optical fiber by the coating die that matches with optical fiber, effectively
The low-loss for realizing optical fiber.
Although hereinbefore invention has been described by reference to embodiment, the scope of the present invention is not being departed from
In the case where, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as being not present
Structural conflict, the various features in presently disclosed embodiment can be combined with each other use by any way,
The description for not carrying out exhaustive to the case where these combinations in this specification is examined merely for the sake of omission length with what is economized on resources
Consider.Therefore, the invention is not limited to specific embodiments disclosed herein, but the institute including falling within the scope of the appended claims
There is technical solution.
Claims (9)
1. a kind of low-loss single-mode optical fiber, which is characterized in that including fibre core (100), inner cladding (200) and surrounding layer (300), institute
The outside that inner cladding (200) is coated on the fibre core (100) is stated, the surrounding layer (300) is coated on the inner cladding (200)
Outside.
2. a kind of low-loss single-mode optical fiber according to claim 1, it is characterised in that: the fibre core (100) is to mix germanium two
Silica.
3. a kind of low-loss single-mode optical fiber according to claim 1, it is characterised in that: the inner cladding (200) is fluorine doped
Silica.
4. a kind of low-loss single-mode optical fiber according to claim 1, it is characterised in that: surrounding layer (300) titanium dioxide
Silicon.
5. a kind of preparation method of low-loss single-mode optical fiber, it is characterised in that: the preparation method of the low-loss single-mode optical fiber includes
Following steps:
S1: drawing optical fibers: prefabricated rods being tucked into high temperature furnace and carry out wire drawing, and prefabricated rods are pushed into high temperature by extending tail pipe
In furnace, blown by being mounted on the tracheae at the top of high temperature furnace to the parallel direction at the top of high temperature furnace, it is true to carrying out taking out in high temperature furnace
It is empty；
S2: anneal for the first time: wire drawing draws optical fiber into the first annealing furnace after coming out of the stove, and is stained with aeroge in the first annealing furnace
Felt keeps the temperature the first annealing furnace by aerogel blanket, carries out slow cooling annealing to the optical fiber in the first annealing furnace；
S3: second anneals: the optical fiber after first time anneals being drawn into the second annealing furnace, is equipped in the second annealing furnace
Heater strip and temperature sensor, the outside blackout of the second annealing furnace have temperature control device, and temperature sensor is filled by conducting wire and temperature control
Connection is set, temperature control device is connect with heater strip by conducting wire, by the temperature in the second annealing furnace of temperature sensor measurement, passed through
Temperature control device controls the heating temperature of heater strip, and the temperature in the second annealing furnace is remained at perseverance by the heating of heater strip
Fixed temperature anneals to optical fiber by constant temperature；
S4: third time is annealed: the optical fiber after second is annealed being drawn into third annealing furnace, the installation of the second annealing furnace inner wall
There is graphite insulating tube, insulation annealing is carried out to optical fiber by graphite insulating tube；
S5: applying coating: the optical fiber after third time is annealed is drawn into coating die, and coating die is infundibulate, coating
The bottom part aperture diameter of mold and the diameter of optical fiber match, and are applied by the coating being contained in coating die to the surface of optical fiber
It covers；
S6: solidify: the optical fiber by coating is drawn to the paint solidification on curing interior focusing fibre；
S7: winding: the optical fiber after solidification is wound by winder.
6. a kind of preparation method of low-loss single-mode optical fiber according to claim 5, it is characterised in that: the step S1
In, the temperature in high temperature furnace is 1900 DEG C -2200 DEG C.
7. a kind of preparation method of low-loss single-mode optical fiber according to claim 5, it is characterised in that: the step S3
In, the temperature of the second annealing furnace is controlled at 1000 DEG C -1200 DEG C.
8. a kind of preparation method of low-loss single-mode optical fiber according to claim 5, it is characterised in that: the step S5
In, the coating contained in coating die is epoxy acrylate or polyacrylate.
9. a kind of preparation method of low-loss single-mode optical fiber according to claim 5, it is characterised in that: the step S6
In, curing is ultraviolet curing machine, carries out ultraviolet curing to optical fiber by ultraviolet light.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470771A (en) * | 2020-04-08 | 2020-07-31 | 杭州辉吉信息技术有限公司 | Optical fiber wire drawing annealing extension tube based on temperature cavity division principle |
| WO2024099321A1 (en) * | 2022-11-07 | 2024-05-16 | 江苏亨通光纤科技有限公司 | Multi-core optical fiber drawing device, multi-core optical fiber drawing method and multi-core optical fiber |
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| CN201626915U (en) * | 2010-02-11 | 2010-11-10 | 长飞光纤光缆有限公司 | Hot-furnace bar changing device of fiber drawing furnace |
| CN102998743A (en) * | 2013-01-05 | 2013-03-27 | 中天科技光纤有限公司 | Low-loss single-mode optical fiber applied to long-distance communication transmission and manufacture method thereof |
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| CN105911639A (en) * | 2016-05-24 | 2016-08-31 | 长飞光纤光缆股份有限公司 | Low-attenuation single-mode optical fiber |
| CN107357004A (en) * | 2017-07-04 | 2017-11-17 | 长飞光纤光缆股份有限公司 | Low-attenuation single-mode optical fiber and preparation method thereof |
| CN108919415A (en) * | 2018-07-19 | 2018-11-30 | 江苏南方光纤科技有限公司 | A kind of low-loss single-mode optical fiber and its drawing process |
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2019
- 2019-04-08 CN CN201910276169.2A patent/CN110174724A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005051854A1 (en) * | 2003-11-29 | 2005-06-09 | Optomagic Co.Ltd | Manufacturing method for single mode optical fiber |
| CN101746950A (en) * | 2008-12-05 | 2010-06-23 | 株式会社藤仓 | Optical fiber manufacturing apparatus and optical fiber manufacturing method |
| CN201626915U (en) * | 2010-02-11 | 2010-11-10 | 长飞光纤光缆有限公司 | Hot-furnace bar changing device of fiber drawing furnace |
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Cited By (2)
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|---|---|---|---|---|
| CN111470771A (en) * | 2020-04-08 | 2020-07-31 | 杭州辉吉信息技术有限公司 | Optical fiber wire drawing annealing extension tube based on temperature cavity division principle |
| WO2024099321A1 (en) * | 2022-11-07 | 2024-05-16 | 江苏亨通光纤科技有限公司 | Multi-core optical fiber drawing device, multi-core optical fiber drawing method and multi-core optical fiber |
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Application publication date: 20190827 |