CN106380069A - A preparing process for an ultra-low-loss optical fiber - Google Patents
A preparing process for an ultra-low-loss optical fiber Download PDFInfo
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- CN106380069A CN106380069A CN201610689616.3A CN201610689616A CN106380069A CN 106380069 A CN106380069 A CN 106380069A CN 201610689616 A CN201610689616 A CN 201610689616A CN 106380069 A CN106380069 A CN 106380069A
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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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
-
- 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
- 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
-
- 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
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
- C03C25/28—Macromolecular compounds or prepolymers obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C03C25/285—Acrylic resins
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/32—Eccentric core or cladding
Abstract
The invention relates to a preparing process for an ultra-low-loss optical fiber. The process includes steps of preform preparing, optical fiber melting and annealing, and optical fiber drawing and curing. VAD, MCVD and OVD processes are adopted, wherein the VAD process deposits a core rod, achieves rapid deposition of the core rod and significantly reduces optical attenuation, the MCVD process achieves a concave structure having a cladding refractive index, and the OVD process is adopted to deposit an outer cladding. A gradient thermal field the temperature of which is 900-1000 DEG C is formed in an annealing and temperature-maintaining furnace. The optical fiber cools gradually in the annealing and temperature-maintaining furnace and substantially releases internal stress. The cured optical fiber is subjected to a screening step, and then processing is finished. The optical fiber has a good cutoff wavelength, bending loss, chromatic dispersion and other comprehensive performance indexes in application wave segments, and can be used as a long-distance optical fiber for communication spanning gobi, deep sea and other bad conditions. Roundness of each layer of the optical fiber is good so that the outer shape of the optical fiber is ensured to be round. The strain of the optical fiber can be 2% or even above.
Description
Technical field
The present invention relates to a kind of field fiber, particularly to a kind of preparation technology of ultra-low-loss fiber.
Background technology
Fiber strength is one of ultra-low-loss fiber key index, be mainly reflected in screening strain on, ordinary optic fibre should
Become typically to tackle 1% about from the tension force causing that lays and expand with heat and contract with cold, and ultra-low-loss fiber is applied in extra long distance
It is often necessary to cross over Gobi desert, the adverse circumstances such as deep-sea in optical communication chain circuit, from considering to lay or during variation of ambient temperature, suffered
The tension force arriving is bigger compared to ordinary optical cable, considers《Deep-sea cable》National standard, lay difficulty and service life etc. side
Face it is desirable to the strain of ultra-low-loss fiber reach 2% even more than, optical fiber cabling and the needs laying can be fully met.
The intensity of optical fiber depends primarily on the micro-crack on bare fibre surface.It is micro-crack in optical fiber essentially from fiber drawing furnace
Foreign particle.Foreign particle is attached to optical fiber surface, in cooling procedure, forms crackle and stress concentration, optical fiber surface splits
Stricture of vagina is gradually corroded by hydrone effect in atmospheric environment, leads to silicon-oxy tetrahedron destructurized, the fracture of siliconoxygen bond can be expanded
The scope of big micro-crack, affects fiber strength.
After fiber drawing furnace long-term work, in stove, graphite piece surface occurs small amounts to make wire drawing furnace body surface become coarse,
Prefabricated rods produce a small amount of silicon dioxide distillation at high temperature and react the hard silicon-carbide particles of generation with wire drawing furnace body inner surface,
And float in stove with the impact of gas stream in the stove.Reduce the impact to optical fiber for the dust in fibre drawing furnace.
Fiber attenuation coefficient, except being limited to the preparation process of prefabricated rods, is also subject to the shadow of quartz glass fictive temperature simultaneously
Ring.When silica fibre is reduced to fictive temperature from softening temperature, inside quartz glass structure converts to equilibrium state.When quartz temperature
Less than after fictive temperature, inside of optical fibre structure is just finalized degree, is difficult to change again.If optical fiber does not have when reaching fictive temperature
Fully release internal stress, then the Rayleigh scattering that optical fiber is caused by density unevenness then can appreciable impact optical fiber attenuation quotient.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of preparation technology of ultra-low-loss fiber.
For solving above-mentioned technical problem, the technical scheme is that：A kind of preparation technology of ultra-low-loss fiber, step
As follows：
（1）Prepared by prefabricated rods：Using VAD+MCVD+OVD technique, wherein VAD process deposits plug, realize quickly sinking of plug
Long-pending, significantly reduce optical fiber attenuation；MCVD technique realizes the sagging structure of cladding index, using OVD process deposits surrounding layer, sinks
Long-pending speed is high, effectively reduces production cost；
（2）Fiber fuse annealing process：Prefabricated rods enter fiber drawing furnace from fiber drawing furnace furnace roof, and the temperature of fiber drawing furnace furnace interior sets
For 2000 ~ 2100 DEG C, prefabricated rods melt drawing in wire drawing furnace body, hauling speed is more than 2200m/min, the ginseng in fiber drawing furnace
Number Real-time Feedback is to control unit；Air inlet supplying inert gas on top gas disk enter fiber drawing furnace；Wind direction is diagonally downward
Fresh air inlet can reduce the probability of ashes and optical fiber contact；Wind direction air inlet straight down, purges fiber drawing furnace inboard wall of furnace body, prevents
Ashes are deposited on wire drawing furnace body；Porous distributing exhaust mode is adopted, funnel shaped design effectively prevents ashes in annealing pipe
Deposition impact fiber strength, the ashes of discharge pass through hose connection to ashes retracting device；Optical fiber in annealing pipe outlet temperature is
1730°；Optical fiber enters temperature insulation annealing furnace, and by control unit independent control, each adds each heating element heater in temperature insulation annealing furnace
The temperature of thermal element is 1000 ~ 1100 DEG C, and the temperature of heating element heater is automatically fed to control unit；Formed in annealing holding furnace
900 ~ 1000 DEG C of gradient thermal field, optical fiber is gradually lowered the temperature in temperature insulation annealing furnace, substantially discharges internal stress；
（3）Optical fiber coating curing process：After optical fiber entrance coating machine carries out coating, enter UV curing oven, environment temperature immediately
20 ~ 30 DEG C of degree, ambient humidity 40 ~ 70%, UV curing oven Power Control 70 ~ 95%, uses convulsion in UV curing oven
System, optical fiber surface curing of coatings volatile matter is extracted out, and takes harmful gass away, temperature sounder detects UV curing oven
Interior temperature, simultaneously by Temperature Feedback to control unit, the wind speed flow that the wind speed detector in solidification air draft pipe detects
It is also fed back into control unit, if temperature and the wind speed flow solidifying in air draft pipe are all setting model in UV curing oven
In enclosing, then optical fiber normally produces；If feeding back to the temperature fluctuation in the UV curing oven of control unit, and solidify exhaust column
Wind speed flow in road also produces corresponding fluctuation, then control and regulation are automatically adjusted valve by control unit, changes convulsion effect
Really, if regulation is invalid, or fluctuation is abnormal, then externally prompting carries out maintenance to equipment；Optical fiber after solidification is through screening work
Sequence, you can complete to process.
Further, described fiber drawing furnace includes top gas disk, wire drawing furnace body and the lower end being coaxially disposed from top to bottom
Annealing pipe, described top gas disk is the loop configuration being vertically arranged, and its side wall has the air inlet of some ring cloth, described stove
The air inlet of one tunnel or two-way air-supply downwards is had on top gas disk side, remaining air inlet all be arranged in parallel, air-supply wind direction with
Vertical direction is in 30 ~ 40 ° of angles；Described wire drawing furnace body is a cylinder, has in receiving prefabricated rods heating wire drawing inside it
Emptying aperture, described annealing pipe is arranged on wire drawing furnace body lower end.
Further, described annealing holding furnace there are two being coaxially disposed up and down, all include inside it upper and lower two groups only
Vertical heating element heater, and two groups of heating element heaters control line traffic control by independent current source respectively, and electrically connect with control unit A.
Further, described UV curing oven is provided with exhausting system, described exhausting system includes air draft pipe, inspection
Survey device and control unit B, temperature sounder that described detection means includes being arranged in UV curing oven, be arranged on solid
Change the wind speed detector in air draft pipe and automatically adjust valve, described control unit B is electrically connected with detection means.
It is an advantage of the current invention that：
（1）The cutoff wavelength of the present invention, bending loss, the comprehensive performance parameter such as dispersion is good in application band, can be used as super
Cross over Gobi desert, the long-distance optical fiber communication of the mal-condition such as deep-sea uses, the strain of this optical fiber can reach 2% even more than；Rationally
Optical fiber fluorine doped blanket design, the appropriate design in conjunction with sandwich layer and each covering is so that this optical fiber has larger effective area；?
In wire drawing preparation process, the circularity of optical fiber keeps preferably, and surface substantially free of impurities hurts, and its intensity and resisting fatigue parameter can reach
To the requirement of adverse circumstances, continuously use more than 25 years；
（2）It is provided with multichannel air inlet, air inlet straight down can prevent in wire drawing furnace body on fiber drawing furnace top gas disk
Wall contamination attachment ashes, the air inlet being obliquely installed can intercept ashes and adhere in optical fiber surface, prevent it in cooling procedure
Form crackle and stress concentration it is ensured that the intensity of optical fiber is so as to disclosure satisfy that the test of adverse circumstances；
（3）Single heater element original for temperature insulation annealing furnace is changed to independent two groups of heating element heaters up and down, and by independent
Power control line is respectively controlled to it；And be connected with fiber drawing furnace by data wire, realize remotely control, setting is suitable to be added
The distance between heating element length and heating element heater, each heating element heater all independent controls, reach entirely covering in temperature insulation annealing furnace
Lid it is ensured that operationally each position actual temperature with arrange temperature identical, internal stress base in this temperature insulation annealing furnace for the optical fiber
Originally it is released, ensure that the attenuation quotient of optical fiber well in the ideal range；
（4）UV curing oven with on-line monitoring convulsion situation, and can carry out convulsion regulation automatically.
Specific embodiment
In high-speed high capacity DWDM（Dense wave division multipurpose）In system, traditional G.652D optical fiber and ultra-low-loss fiber
Due to nonlinear effect, transmission range is restricted.With various novel coding modes（As RZ（NRZ）Deng）, error correcting technique
（As FEC（Forward error correction）、SFEC（Super forward error correction）Deng）Appearance and various low-noise amplifier（As DRA（Distributed draw
Graceful fiber amplifier）Deng）Development, the OSNR to dwdm system（OSNR）Tolerance requirements and OSNR deterioration have clearly
Improvement, fibre loss no longer be limit system transfers deciding factor.In current dwdm system, nonlinear effect becomes
The key constraints of current speed fiber optic communication systems.Under luminous power transmission, optical fiber can occur Raman scattering, Ke Er effect
Nonlinear effect should be waited, affect loss factor under strong laser field for the optical fiber and variations in refractive index.The optical fiber being applied to DWDM is existing
Report, the optical fiber of pure silica core has relatively low loss, but makes complex, and effective area increases and means fiber stress
Added losses also increase therewith.
Ultra-low-loss fiber is the material base of following Large Copacity optical communication development, is the war that " broadband China " is carried out by China
Slightly, realize the important medium of 400G ultrahigh speed bandwidth.
Ultra-low-loss fiber is made up of acrylate inside and outside coating, fluorine doped covering and pure silicon sandwich layer.Sandwich layer is pure titanium dioxide
Silica glass layer, its radius is 5 ~ 7 μm, and its out-of-roundness is 1.5%, and covering includes inner cladding, middle covering and surrounding layer, inner cladding
For fluorine doped inner cladding, its radius r2 is 5 ~ 12 μm, and refractive index contrast is -0.4 ~ -0.2%, and middle cladding radius r3 is 12 ~ 25 μm,
Surrounding layer is pure quartz glass layer, and its radius r4 is 25 ~ 45 μm, and this covering entirety out-of-roundness is 0.2%, and coating material is using poly-
Acrylate, including undercoating and external coating, a diameter of 192 μm of undercoating, its out-of-roundness is 0.6%, and outer coating diameter is
245 μm, its out-of-roundness is 0.8%.
The key technical indexes of ultra-low-loss fiber is as shown in the table：
The intensity of optical fiber depends primarily on the micro-crack on bare fibre surface.It is micro-crack in optical fiber essentially from miscellaneous in fiber drawing furnace
Plasmid.Foreign particle is attached to optical fiber surface, in cooling procedure, forms crackle and stress concentration, optical fiber surface crackle is subject to
In atmospheric environment, hydrone acts on and gradually corrodes, and leads to silicon-oxy tetrahedron destructurized, and the fracture of siliconoxygen bond can expand micro-
The scope of crackle, affects fiber strength.
After fiber drawing furnace long-term work, in stove, graphite piece surface occurs small amounts to make graphite piece surface become coarse, prefabricated
Rod produces a small amount of silicon dioxide distillation at high temperature and reacts the hard silicon-carbide particles of generation with graphite piece surface, and with gas in stove
The impact of stream floats in stove.Wire drawing furnace body upper end is top gas disk, and lower end is annealing pipe, conventional fiber fiber drawing furnace indifferent gas
Body intake method is generally upper flat and blows into gas, and noble gases are passed through by way of laminar flow and enter inside fiber drawing furnace
Annealing pipe, the advantage of this air inlet method is that gentle air-flow will not cause wire drawing gas stream in the stove disturbance, so that ashes is deposited
In graphite piece inwall, reduce the probability of ashes and optical fiber contact, but produce through long wire drawing, the ashes of graphite piece inwall
To a certain extent, it will cause serious impact to lead to wire drawing midway intensity rapid under the influence of High temperature diffusion to optical fiber for accumulation
Become, affect the quality of optical fiber and the service life of graphite piece.
Fiber attenuation coefficient, except being limited to the preparation process of prefabricated rods, is also subject to the shadow of quartz glass fictive temperature simultaneously
Ring.When silica fibre is reduced to fictive temperature from softening temperature, inside quartz glass structure converts to equilibrium state.When quartz temperature
Less than after fictive temperature, inside of optical fibre structure is just finalized degree, is difficult to change again.If optical fiber does not have when reaching fictive temperature
Fully release internal stress, then the Rayleigh scattering that optical fiber is caused by density unevenness then can appreciable impact optical fiber attenuation quotient.Move back
The internal stress of the impact optical fiber of ignition technique, but current annealing in-furnace temperature is uneven, easily causes optical fiber internal stresses release not
Completely.
In existing optical fiber coating cure system, exhausting system typically to be used in curing oven, on the one hand reduces ultraviolet light
Solidification in-furnace temperature, extends ultraviolet light polymerization furnace li`, on the other hand extracts optical fiber surface curing of coatings volatile matter, improve optical fiber
Crudy；Meanwhile, harmful gass are taken away, it is to avoid volatile matter pollutes surrounding and causes hazard to person, but convulsion stream simultaneously
Measure solidification effect too big or too little and that optical fiber can be affected, general convulsion flow is all in a stable scope.
When, in actual production process, one side air draft pipe easily blocks in long use, and convulsion amount can subtract
Little it is necessary to by manually periodically being detected to convulsion flow and adjusting during blowing out, to ensure the flow normally using；Separately
On the one hand, if convulsion Flow-rate adjustment is too big or too little, the solidification effect of optical fiber can be affected.Original curing process needs people
Work is monitored and adjusts, and anthropic factor is more；Another aspect optical fiber production midway coats solidification and goes wrong it is necessary to force eventually
Stop producing and just can be monitored adjusting, it is impossible to monitor convulsion actual flow during normal production.
In the preparation process of ultra-low-loss fiber, it is prepared using ultra-low-loss fiber wire drawing and annealing system, prefabricated
Rod enters fiber drawing furnace from fiber drawing furnace furnace roof, and the temperature of fiber drawing furnace furnace interior is 2000 ~ 2100 DEG C, and prefabricated rods are in wire drawing furnace body
Interior melt drawing, hauling speed is >=2200m/min, the air inlet supplying inert gas on temperature top gas disk on fiber drawing furnace
Enter fiber drawing furnace；Wind direction fresh air inlet diagonally downward can reduce the probability of ashes and optical fiber contact, and such fresh air inlet has flat
Row setting several, air-supply wind direction and vertical direction are in 30 ~ 40 ° of angles；Wind direction air inlet straight down, purges fiber drawing furnace
Inboard wall of furnace body, prevents ashes to be deposited on wire drawing furnace body；Porous distributing exhaust mode, funnel shaped design is adopted in annealing pipe
Effectively prevent ashes deposition impact fiber strength, the ashes of discharge pass through hose connection to ashes retracting device；Optical fiber is in annealing
Pipe outlet temperature is 1730 °；Optical fiber enters temperature insulation annealing furnace, and each heating element heater in temperature insulation annealing furnace is independent by control unit
Control, form 900 ~ 1000 DEG C of gradient thermal field.
The scattering loss of optical fiber is the maximum reason of fibre loss.The most important part of fibre scattering is exactly Rayleigh scattering.
Rayleigh scattering be by refractive index small uneven caused in fiber optic materials it is known that, auspicious produced by Density inhomogeneity
Profit scattering is mainly determined by refractive index n, fictive temperature Tf and isothermal compressibility β T.These three factors are all subject to drawing process
Impact.The size of isothermal compressibility is closely related with temperature.When fiber optic temperature is higher than fictive temperature, glass viscosity is relatively
Little, the density that the stress less than 10MPa just can result in glass changes；And when fiber optic temperature is less than fictive temperature, need to be up to
The stress of 2000MPa could affect the density of glass.Therefore, the impact to Rayleigh scattering for the isothermal compressibility depends on imagination temperature
Degree, the fictive temperature of optical fiber is mainly determined by glass viscosity and rate of cooling.For optical fiber production, the species of glass and
Viscosity is determined, then fictive temperature mainly determined by the rate of cooling of optical fiber it is known that, optical fiber is under fixing drawing speed
Actual temperature and rate of temperature fall.By add temperature insulation annealing furnace thermal field, control optical fiber go out to anneal holding furnace when actual temperature, protect
Card fiber optic temperature, more than 1000 DEG C, makes optical fiber fully discharge internal stress.Optical fiber rate of temperature fall is with the liter of holding furnace thermal field temperature
High and decline, when rate of temperature fall is in below 5000k/s, optical fiber internal stress can discharge completely, eliminates and is produced by density unevenness
Rayleigh scattering reduce the purpose of optical fiber attenuation, if the setting of insulation thermal field is too high simultaneously, fiber outlet temperature is higher than
During 1200 DEG C of entrance environment, it is possible to lead to fibre cladding, by temperature jump, sandwich layer remains in that high temperature, is easily caused inside and outside
Here produces stress, affects optical fiber attenuation.In addition too high fiber outlet temperature makes optical fiber cool down needs bigger energy consumption and cold
But helium, improves optical fiber cost, therefore insulation thermal field is set to 900-1000 DEG C.
Due to small area preform drawing is had greatly using irregular ultra-low loss, control fiber fuse in fiber drawing furnace
During temperature, heating-up temperature has suitable fine setting, makes optical fiber go out annealing pipe temperature and changes, and now needs to arrange suitable annealing
It is incubated field temperature to coordinate optical fiber tapping temperature.This key technology utilizes data wire to connect holding furnace power supply and wire drawing machine master control meter
Calculation machine, realizes insulation furnace temperature remotely control, meanwhile, in conjunction with real time furnace temperature, real-time drawing speed and constant rate of temperature fall, counts
Calculate holding furnace suitable temperature and carry out automatic fine tuning control.Realize constant optical fiber annealing Optimal Temperature.
Optical fiber enters UV curing oven, 20 ~ 30 DEG C of general production environment temperature, ambient humidity 40 ~ 70%, UV-curing
Change stove Power Control 70 ~ 95%, use exhausting system in UV curing oven, exhausting system includes air draft pipe, detection means
And control unit B, temperature sounder that detection means includes being arranged in UV curing oven, it is arranged on solidification air draft pipe
Interior wind speed detector and automatically adjust valve, control unit B is electrically connected with detection means；Optical fiber surface curing of coatings is waved
Stimulating food is extracted out, and takes harmful gass away, and temperature sounder detects the temperature in UV curing oven, extremely by Temperature Feedback simultaneously
Control unit B, the wind speed flow that the wind speed detector in solidification air draft pipe detects is also fed back into control unit B, if purple
All in set point, then optical fiber normally produces wind speed flow in outer photocuring in-furnace temperature and solidification air draft pipe.As
Fruit feeds back to the temperature fluctuation in the UV curing oven of control unit B, and the wind speed flow solidifying in air draft pipe also produces
Corresponding fluctuation, then control unit B control and regulation are automatically adjusted valve, change convulsion effect, if adjusting invalid, or fluctuation
Abnormal, then externally prompting carries out maintenance to equipment.
After UV curing oven exhausting system is improved：1st, the convulsion situation of on-line monitoring UV curing oven can be passed through；
2nd, by the convulsion of on-line monitoring UV curing oven it can be determined that the solidification effect of optical fiber, by the solidification quality of optical fiber, can
To automatically adjust solidification convulsion；3rd, pass through the monitoring temperature in UV curing oven, adjust with convulsion, UV-curing can be increased
Change furnace li`；4th, fully meet the removal of the UV curing oven volatile matter in fiber drawing process, increase optical fiber quality.
Optical fiber after solidification is through screening process, you can complete to process.
Ultimate principle and the principal character of the present invention have been shown and described above.It should be understood by those skilled in the art that,
The present invention is not restricted to the described embodiments, merely illustrating the principles of the invention described in above-described embodiment and description,
Without departing from the spirit and scope, the present invention also has various changes and modifications, and these changes and improvements all fall
Enter in scope of the claimed invention.Claimed scope is by appending claims and its equivalent thereof.
Claims (4)
1. a kind of preparation technology of ultra-low-loss fiber it is characterised in that：Step is as follows：
（1）Prepared by prefabricated rods：Using VAD+MCVD+OVD technique, wherein VAD process deposits plug, realize quickly sinking of plug
Long-pending, significantly reduce optical fiber attenuation；MCVD technique realizes the sagging structure of cladding index, using OVD process deposits surrounding layer, sinks
Long-pending speed is high, effectively reduces production cost；
（2）Fiber fuse annealing process：Prefabricated rods enter fiber drawing furnace from fiber drawing furnace furnace roof, and the temperature of fiber drawing furnace furnace interior sets
For 2000 ~ 2100 DEG C, prefabricated rods melt drawing in wire drawing furnace body, hauling speed is more than 2200m/min, the ginseng in fiber drawing furnace
Number Real-time Feedback is to control unit；Air inlet supplying inert gas on top gas disk enter fiber drawing furnace；Wind direction is diagonally downward
Fresh air inlet can reduce the probability of ashes and optical fiber contact；Wind direction air inlet straight down, purges fiber drawing furnace inboard wall of furnace body, prevents
Ashes are deposited on wire drawing furnace body；Porous distributing exhaust mode is adopted, funnel shaped design effectively prevents ashes in annealing pipe
Deposition impact fiber strength, the ashes of discharge pass through hose connection to ashes retracting device；Optical fiber in annealing pipe outlet temperature is
1730°；Optical fiber enters temperature insulation annealing furnace, and by control unit independent control, each adds each heating element heater in temperature insulation annealing furnace
The temperature of thermal element is 1000 ~ 1100 DEG C, and the temperature of heating element heater is automatically fed to control unit；Formed in annealing holding furnace
900 ~ 1000 DEG C of gradient thermal field, optical fiber is gradually lowered the temperature in temperature insulation annealing furnace, substantially discharges internal stress；
（3）Optical fiber coating curing process：After optical fiber entrance coating machine carries out coating, enter UV curing oven, environment temperature immediately
20 ~ 30 DEG C of degree, ambient humidity 40 ~ 70%, UV curing oven Power Control 70 ~ 95%, uses convulsion in UV curing oven
System, optical fiber surface curing of coatings volatile matter is extracted out, and takes harmful gass away, temperature sounder detects UV curing oven
Interior temperature, simultaneously by Temperature Feedback to control unit, the wind speed flow that the wind speed detector in solidification air draft pipe detects
It is also fed back into control unit, if temperature and the wind speed flow solidifying in air draft pipe are all setting model in UV curing oven
In enclosing, then optical fiber normally produces；If feeding back to the temperature fluctuation in the UV curing oven of control unit, and solidify exhaust column
Wind speed flow in road also produces corresponding fluctuation, then control and regulation are automatically adjusted valve by control unit, changes convulsion effect
Really, if regulation is invalid, or fluctuation is abnormal, then externally prompting carries out maintenance to equipment；Optical fiber after solidification is through screening work
Sequence, you can complete to process.
2. a kind of ultra-low-loss fiber according to claim 1 preparation technology it is characterised in that：Described fiber drawing furnace is from upper
And top gas disk, wire drawing furnace body and lower end annealing pipe that lower inclusion is coaxially disposed, described top gas disk is vertically arranged
Loop configuration, its side wall has the air inlet of some ring cloth, described top gas disk side has a road or two road directions
The air inlet of lower air-supply, remaining air inlet all be arranged in parallel, and air-supply wind direction and vertical direction are in 30 ~ 40 ° of angles；Described fiber drawing furnace
Body of heater is a cylinder, has and accommodate the hollow hole that prefabricated rods heat wire drawing inside it, and described annealing pipe is arranged on wire drawing furnace body
Lower end.
3. a kind of ultra-low-loss fiber according to claim 1 preparation technology it is characterised in that：Described annealing holding furnace
There are two being coaxially disposed up and down, inside it, all include the heating element heater of upper and lower two groups of independences, and two groups of heating element heaters are respectively
Line traffic control is controlled by independent current source, and electrically connects with control unit A.
4. a kind of ultra-low-loss fiber according to claim 1 preparation technology it is characterised in that：Described ultraviolet light polymerization
It is provided with exhausting system, described exhausting system includes air draft pipe, detection means and control unit B, described detection dress on stove
Put including the temperature sounder being arranged in UV curing oven, be arranged on solidification air draft pipe in wind speed detector and from
Dynamic control valve, described control unit B is electrically connected with detection means.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610689616.3A CN106380069A (en) | 2016-08-19 | 2016-08-19 | A preparing process for an ultra-low-loss optical fiber |
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| CN201610689616.3A CN106380069A (en) | 2016-08-19 | 2016-08-19 | A preparing process for an ultra-low-loss optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716862A (en) * | 2021-09-01 | 2021-11-30 | 中天科技光纤有限公司 | Method and apparatus for manufacturing optical fiber |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716862A (en) * | 2021-09-01 | 2021-11-30 | 中天科技光纤有限公司 | Method and apparatus for manufacturing optical fiber |
| CN113716862B (en) * | 2021-09-01 | 2023-03-21 | 中天科技光纤有限公司 | Method and apparatus for manufacturing optical fiber |
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Application publication date: 20170208 |