CN106277745A - A kind of preparation technology of ultra-low loss large effective area fiber - Google Patents
A kind of preparation technology of ultra-low loss large effective area fiber Download PDFInfo
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- CN106277745A CN106277745A CN201610689327.3A CN201610689327A CN106277745A CN 106277745 A CN106277745 A CN 106277745A CN 201610689327 A CN201610689327 A CN 201610689327A CN 106277745 A CN106277745 A CN 106277745A
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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
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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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- 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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- 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
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- 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
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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
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode 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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- 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
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Abstract
The present invention relates to the preparation technology of a kind of ultra-low loss large effective area fiber, prepare including prefabricated rods, fiber fuse annealing process and drawing optical fibers curing process, use VAD+MCVD+OVD technique, wherein VAD process deposits plug, it is achieved the fast deposition of plug, significantly reduces optical fiber attenuation；MCVD technique realizes the sagging structure of cladding index, uses OVD process deposits surrounding layer；Forming the gradient temperature field of 800 ~ 1200 DEG C in annealing holding furnace, optical fiber is gradually lowered the temperature in temperature insulation annealing furnace, substantially discharges internal stress；Optical fiber after solidification, through screening process, can complete processing.The cutoff wavelength of the present invention, bending loss, the comprehensive performance parameter such as dispersion are good at application band, can use as the long-distance optical fiber communication of the mal-conditions such as super leap Gobi desert, deep-sea, and optical fiber each layer circularity is all right, ensure shape molding mellow and full, the strain of this optical fiber can reach 2% even more than.
Description
Technical field
The present invention relates to a kind of field fiber, particularly to the preparation technology of a kind of ultra-low loss large effective area fiber.
Background technology
Fiber strength is one of ultra-low-loss fiber key index, is mainly reflected in screening strain, answering of ordinary optic fibre
Become and typically tackle from laying and expand with heat and contract with cold the tension force caused about 1%, and ultra-low-loss fiber is applied at extra long distance
In optical communication chain circuit, it is often necessary to cross over the adverse circumstances such as Gobi desert, deep-sea, from considering to lay or during variation of ambient temperature, suffered
The tension force arrived is bigger compared to ordinary optical cable, considers " deep-sea cable " national standard, lays the side such as difficulty and service life
Face, it is desirable to the strain of ultra-low-loss fiber reach 2% even more than, it is possible to fully meet optical fiber cabling and the needs laid.
The intensity of optical fiber depends primarily on the micro-crack on bare fibre surface.Optical fiber is micro-crack is essentially from fiber drawing furnace
Foreign particle.Foreign particle is attached to optical fiber surface, in cooling procedure, forms crackle and stress is concentrated, and optical fiber surface splits
Stricture of vagina is gradually corroded by hydrone effect in atmospheric environment, causes silicon-oxy tetrahedron destructurized, and 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 fiber drawing furnace body of heater surface become coarse,
Prefabricated rods at high temperature produces the distillation of a small amount of silicon dioxide and reacts, with fiber drawing furnace body of heater inner surface, the silicon-carbide particles that generation is hard,
And with the impact of gas stream in the stove in stove floating.Reduce the dust impact on optical fiber in fibre drawing furnace.
Fiber attenuation coefficient is except being limited to the preparation process of prefabricated rods, simultaneously also by the shadow of quartz glass fictive temperature
Ring.When silica fibre is reduced to fictive temperature from softening temperature, inside quartz glass structure converts to equilibrium state.When quartz temperature
Degree is less than after fictive temperature, and inside of optical fibre structure is just finalized, and is difficult to change again.If optical fiber does not has when arriving fictive temperature
Fully discharge internal stress, then the Rayleigh scattering that optical fiber is caused by density unevenness then can the attenuation quotient of appreciable impact optical fiber.
Summary of the invention
The technical problem to be solved in the present invention is to provide the preparation technology of a kind of ultra-low loss large effective area fiber.
For solving above-mentioned technical problem, the technical scheme is that the system of a kind of ultra-low loss large effective area fiber
Standby technique, step is as follows:
(1) prepared by prefabricated rods: use VAD+MCVD+OVD technique, wherein VAD process deposits plug, it is achieved quickly sinking of plug
Long-pending, significantly reduce optical fiber attenuation；MCVD technique realizes the sagging structure of cladding index, uses OVD process deposits surrounding layer, heavy
Long-pending speed is high, effectively reduces production cost；
(2) fiber fuse annealing process: prefabricated rods enters fiber drawing furnace from fiber drawing furnace furnace roof, the temperature of fiber drawing furnace furnace interior sets
Being 2100 ~ 2200 DEG C, prefabricated rods is melt drawing in fiber drawing furnace body of heater, and hauling speed is more than 2500m/min, the ginseng in fiber drawing furnace
Number Real-time Feedback is to control unit；Air inlet supplying inert gas on top gas dish enters 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 fiber drawing furnace body of heater；Using porous distributing exhaust mode in annealing pipe, funnel shaped design effectively prevents ashes
Deposition affects fiber strength, and the ashes of discharge are by hose connection to ashes retracting device；Optical fiber 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 independently controlled by control unit, Mei Gejia
The temperature of thermal element is 1000 ~ 1200 DEG C, and the temperature of heating element heater is automatically fed to control unit；Formed in annealing holding furnace
The gradient temperature field of 900 ~ 1100 DEG C, 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
Spending 20 ~ 28 DEG C, ambient humidity 40 ~ 60%, UV curing oven power controls 70 ~ 95%, uses convulsion in UV curing oven
System, extracts out optical fiber surface curing of coatings volatile matter, and takes harmful gas away, and 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
Be also fed back into control unit, if in UV curing oven temperature and solidification air draft pipe in wind speed flow all set model
In enclosing, then optical fiber normally produces；If the temperature fluctuation fed back in the UV curing oven of control unit, and solidification exhaust column
Wind speed flow in road also produces the fluctuation of correspondence, then control and regulation are automatically adjusted valve by control unit, changes convulsion effect
Really, if regulating invalid, or fluctuation is abnormal, then externally prompting carries out maintenance to equipment；Optical fiber after solidification is through screening work
Sequence, can complete processing.
Further, described fiber drawing furnace includes top gas dish, fiber drawing furnace body of heater and the lower end being coaxially disposed from top to bottom
Annealing pipe, described top gas dish is the loop configuration being vertically arranged, and its sidewall has the air inlet of some ring cloth, described stove
Having a road on top gas dish side or air inlet that two-way is blown downwards, remaining air inlet all be arranged in parallel, air-supply wind direction with
Vertical direction is 15 ~ 45 ° of angles；Described fiber drawing furnace body of heater is a cylinder, has receiving prefabricated rods and add in hot wire drawing inside it
Emptying aperture, described annealing pipe is arranged on fiber drawing furnace body of heater lower end.
Further, described annealing holding furnace has two be 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 by independent current source control line respectively, and electrically connect with control unit A.
Further, described UV curing oven being provided with exhausting system, described exhausting system includes air draft pipe, inspection
Surveying device and control unit B, described detection device includes the temperature sounder being arranged in UV curing oven, is arranged on admittedly
Changing the wind speed detector in air draft pipe and be automatically adjusted valve, described control unit B electrically connects with detection device.
It is an advantage of the current invention that:
(1) cutoff wavelength of the present invention, bending loss, the comprehensive performance parameter such as dispersion is good at application band, can be as super
The long-distance optical fiber communication crossing over the mal-condition such as Gobi desert, deep-sea uses, the strain of this optical fiber can reach 2% even more than；Rationally
Optical fiber fluorine doped blanket design, in conjunction with sandwich layer and the appropriate design of each covering so that this optical fiber has bigger 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, use more than 25 years continuously；
(2) multichannel air inlet it is provided with on fiber drawing furnace top gas dish, in air inlet straight down is possible to prevent fiber drawing furnace body of heater
Wall contamination attachment ashes, the air inlet being obliquely installed can intercept ashes and adhere at optical fiber surface, prevent it in cooling procedure
Form crackle and stress is concentrated, it is ensured that the intensity of optical fiber so that it is disclosure satisfy that the test of adverse circumstances；
(3) single heater element original for temperature insulation annealing furnace is changed independent two groups of heating element heaters up and down into, and by independent
It is respectively controlled by power control line；And be connected with fiber drawing furnace by data wire, it is achieved remotely control, arrange and suitably add
Distance between heating element length and heating element heater, each heating element heater the most independently controls, and reaches entirely covering in temperature insulation annealing furnace
Lid, it is ensured that operationally each position actual temperature is with to arrange temperature identical, optical fiber internal stress base in this temperature insulation annealing furnace
Originally it is released, well ensure that the attenuation quotient of optical fiber in the ideal range；
(4) UV curing oven with on-line monitoring convulsion situation, and can carry out convulsion regulation automatically.
Detailed description of the invention
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.Along with various novel coding modes (such as RZ(NRZ) etc.), error correcting technique
(such as FEC(forward error correction), SFEC(super forward error correction) etc.) appearance and various low-noise amplifier (draw as DRA(is distributed
Graceful fiber amplifier) etc.) development, the OSNR(OSNR to dwdm system) 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 is transmitted, optical fiber can occur Raman scattering, Ke Er effect
Nonlinear effect should be waited, affect optical fiber loss factor under strong laser field and variations in refractive index.The optical fiber being applicable 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 increase the most therewith.
Ultra-low-loss fiber is the material base of following Large Copacity optical communication development, is the war of China's implementation " broadband China "
Slightly, it is achieved 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 uses 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.Be micro-crack in optical fiber essentially from fiber drawing furnace is miscellaneous
Plasmid.Foreign particle is attached to optical fiber surface, in cooling procedure, forms crackle and stress is concentrated, and optical fiber surface crackle is subject to
Hydrone effect in atmospheric environment and gradually corrode, cause silicon-oxy tetrahedron destructurized, 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 at high temperature produces the distillation of a small amount of silicon dioxide and reacts, with graphite piece surface, the silicon-carbide particles that generation is hard, and with gas in stove
The impact of stream is floating in stove.Fiber drawing furnace body of heater upper end is top gas dish, and lower end is annealing pipe, conventional fiber fiber drawing furnace indifferent gas
Body intake method generally upper flat blows into gas, and noble gas passes through the internal entrance of fiber drawing furnace by the way of laminar flow
Annealing pipe, the advantage of this air inlet method be mild air-flow will not in causing fiber drawing furnace flow perturbation, make ashes deposit
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
Running up to a certain degree, optical fiber will be caused serious impact to cause wire drawing midway intensity rapid under the influence of High temperature diffusion by it
Become, affect the quality of optical fiber and the service life of graphite piece.
Fiber attenuation coefficient is except being limited to the preparation process of prefabricated rods, simultaneously also by the shadow of quartz glass fictive temperature
Ring.When silica fibre is reduced to fictive temperature from softening temperature, inside quartz glass structure converts to equilibrium state.When quartz temperature
Degree is less than after fictive temperature, and inside of optical fibre structure is just finalized, and is difficult to change again.If optical fiber does not has when arriving fictive temperature
Fully discharge internal stress, then the Rayleigh scattering that optical fiber is caused by density unevenness then can the attenuation quotient of appreciable impact optical fiber.Move back
The internal stress affecting 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 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 extraction optical fiber surface curing of coatings volatile matter, improves optical fiber
Crudy；Meanwhile, harmful gas is taken away, it is to avoid volatile matter pollutes surrounding and causes hazard to person, but convulsion stream simultaneously
Measuring the biggest or the least solidification effect that can affect again optical fiber, general convulsion flow is all in a stable scope.
When, in actual production process, on the one hand air draft pipe easily blocks in using for a long time, and convulsion amount can subtract
Little, it is necessary to by human at periodic intervals, convulsion flow to be detected and adjusts during blowing out, to ensure the normal flow used；Separately
On the one hand, if convulsion Flow-rate adjustment is the biggest or the least, then the solidification effect of optical fiber can be affected.Original curing process needs people
Work is monitored and regulates, and anthropic factor is more；On the other hand the coating solidification of optical fiber production midway goes wrong, it is necessary to force eventually
Only produce and just can be monitored regulation, when normally producing, it is impossible to monitoring convulsion actual flow.
In the preparation process of ultra-low-loss fiber, ultra-low-loss fiber wire drawing and annealing system is used to be prepared, prefabricated
Rod enters fiber drawing furnace from fiber drawing furnace furnace roof, and the temperature of fiber drawing furnace furnace interior is 2100 ~ 2200 DEG C, and prefabricated rods is at fiber drawing furnace body of heater
Interior melt drawing, hauling speed is >=2500m/min, the air inlet supplying inert gas on temperature top gas dish 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 arrange several, air-supply wind direction and vertical direction are 15 ~ 45 ° of angles；Wind direction air inlet straight down, purges fiber drawing furnace
Inboard wall of furnace body, prevents ashes to be deposited on fiber drawing furnace body of heater；Annealing pipe uses porous distributing exhaust mode, funnel shaped design
Effectively preventing ashes deposition from affecting fiber strength, the ashes of discharge are by 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 the gradient temperature field of 900 ~ 1100 DEG C.
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 is by refractive index small uneven caused in fiber optic materials, it is known that, by auspicious produced by Density inhomogeneity
Profit scattering is mainly determined by refractive index n, fictive temperature Tf and isothermal compressibility β T.These three factor is all by 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, stress less than 10MPa just can result in the density of glass and 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, isothermal compressibility depends on imagination temperature to the impact of Rayleigh scattering
Degree, the fictive temperature of optical fiber is mainly determined by glass viscosity and rate of cooling.For optical fiber production, the kind of glass and
Viscosity is determined, then fictive temperature is 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 insulation annealing furnace temperature field, control optical fiber go out to anneal holding furnace time 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 insulation furnace temperature field temperature
High and decline, when rate of temperature fall is at 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 field of insulation temperature simultaneously arranges too high, fiber outlet temperature is higher than
During 1200 DEG C of entrance environment, it is possible to sandwich layer remains in that high temperature by temperature jump to cause fibre cladding, it is easily caused inside and outside
Produce stress at this, affect optical fiber attenuation.The most too high fiber outlet temperature makes optical fiber cooling need bigger energy consumption and cold
But helium, improves optical fiber cost, therefore insulation temperature field is set to 800-1200 DEG C.
Owing to using irregular ultra-low loss to have greatly little area fiber prefabricated stick drawn wire, in fiber drawing furnace, control fiber fuse
During temperature, heating-up temperature has suitably fine setting, makes optical fiber go out annealing pipe temperature and changes, and now needs to arrange suitably annealing
Insulation field temperature coordinates 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, it is achieved holding furnace temperature remotely controls, meanwhile, in conjunction with real time furnace temperature, real-time drawing speed and constant rate of temperature fall, meter
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, general production environment temperature 20 ~ 28 DEG C, ambient humidity 40 ~ 60%, UV-curing
Change stove power and control 70 ~ 95%, in UV curing oven, use exhausting system, exhausting system to include air draft pipe, detection device
And control unit B, detection device includes the temperature sounder being arranged in UV curing oven, is arranged on solidification air draft pipe
In wind speed detector and be automatically adjusted valve, control unit B with detect device electrically connect；Optical fiber surface curing of coatings is waved
Stimulating food is extracted out, and takes harmful gas 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
Wind speed flow in outer photocuring in-furnace temperature and solidification air draft pipe is all in set point, then optical fiber normally produces.As
The wind speed flow that fruit feeds back in the temperature fluctuation in the UV curing oven of control unit B, and solidification air draft pipe also produces
Corresponding fluctuation, then control and regulation are automatically adjusted valve by control unit B, change convulsion effect, if regulate invalid, or fluctuation
Abnormal, then externally prompting carries out maintenance to equipment.
After UV curing oven exhausting system is improved: 1, can be by the convulsion situation of on-line monitoring UV curing oven；
2, 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 be automatically adjusted solidification convulsion；3, by the monitoring temperature in UV curing oven, regulate with convulsion, UV-curing can be increased
Change furnace li`；4, fully meet the removal of UV curing oven volatile matter in fiber drawing process, increase optical fiber quality.
Optical fiber after solidification, through screening process, can complete processing.
Ultimate principle and the principal character of the present invention have more than been shown and described.Skilled person will appreciate that of the industry,
The present invention is not restricted to the described embodiments, the principle that the present invention is simply described 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 defined by appending claims and equivalent thereof.
Claims (4)
1. the preparation technology of a ultra-low loss large effective area fiber, it is characterised in that: step is as follows:
(1) prepared by prefabricated rods: use VAD+MCVD+OVD technique, wherein VAD process deposits plug, it is achieved quickly sinking of plug
Long-pending, significantly reduce optical fiber attenuation；MCVD technique realizes the sagging structure of cladding index, uses OVD process deposits surrounding layer, heavy
Long-pending speed is high, effectively reduces production cost；
(2) fiber fuse annealing process: prefabricated rods enters fiber drawing furnace from fiber drawing furnace furnace roof, the temperature of fiber drawing furnace furnace interior sets
Being 2100 ~ 2200 DEG C, prefabricated rods is melt drawing in fiber drawing furnace body of heater, and hauling speed is more than 2500m/min, the ginseng in fiber drawing furnace
Number Real-time Feedback is to control unit；Air inlet supplying inert gas on top gas dish enters 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 fiber drawing furnace body of heater；Using porous distributing exhaust mode in annealing pipe, funnel shaped design effectively prevents ashes
Deposition affects fiber strength, and the ashes of discharge are by hose connection to ashes retracting device；Optical fiber 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 independently controlled by control unit, Mei Gejia
The temperature of thermal element is 1000 ~ 1200 DEG C, and the temperature of heating element heater is automatically fed to control unit；Formed in annealing holding furnace
The gradient temperature field of 900 ~ 1100 DEG C, 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
Spending 20 ~ 28 DEG C, ambient humidity 40 ~ 60%, UV curing oven power controls 70 ~ 95%, uses convulsion in UV curing oven
System, extracts out optical fiber surface curing of coatings volatile matter, and takes harmful gas away, and 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
Be also fed back into control unit, if in UV curing oven temperature and solidification air draft pipe in wind speed flow all set model
In enclosing, then optical fiber normally produces；If the temperature fluctuation fed back in the UV curing oven of control unit, and solidification exhaust column
Wind speed flow in road also produces the fluctuation of correspondence, then control and regulation are automatically adjusted valve by control unit, changes convulsion effect
Really, if regulating invalid, or fluctuation is abnormal, then externally prompting carries out maintenance to equipment；Optical fiber after solidification is through screening work
Sequence, can complete processing.
The preparation technology of a kind of ultra-low loss large effective area fiber the most according to claim 1, it is characterised in that: described
Fiber drawing furnace includes top gas dish, fiber drawing furnace body of heater and the lower end annealing pipe being coaxially disposed from top to bottom, and described top gas dish is
The loop configuration being vertically arranged, its sidewall has the air inlet of some ring cloth, described top gas dish side has a road
Or the air inlet that two-way is blown downwards, remaining air inlet all be arranged in parallel, and air-supply wind direction is 15 ~ 45 ° of angles with vertical direction；
Described fiber drawing furnace body of heater is a cylinder, has receiving prefabricated rods and add the hollow hole of hot wire drawing inside it, and described annealing pipe is arranged on
Fiber drawing furnace body of heater lower end.
The preparation technology of a kind of ultra-low loss large effective area fiber the most according to claim 1, it is characterised in that: described
Annealing holding furnace has two be coaxially disposed up and down, all includes the heating element heater of upper and lower two groups of independences, and two groups add inside it
Thermal element is controlled by independent current source control line respectively, and electrically connects with control unit A.
The preparation technology of a kind of ultra-low loss large effective area fiber the most according to claim 1, it is characterised in that: described
Being provided with exhausting system on UV curing oven, described exhausting system includes air draft pipe, detection device and control unit B,
The wind speed inspection that described detection device includes the temperature sounder being arranged in UV curing oven, is arranged in solidification air draft pipe
Surveying instrument and be automatically adjusted valve, described control unit B electrically connects with detection device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018126805A1 (en) * | 2017-01-05 | 2018-07-12 | 富通集团（嘉善）通信技术有限公司 | Large-size optical fiber perform dehydroxylation annealing method and device |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018126805A1 (en) * | 2017-01-05 | 2018-07-12 | 富通集团（嘉善）通信技术有限公司 | Large-size optical fiber perform dehydroxylation annealing method and device |
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