CN106199823A - A kind of large effective area fiber - Google Patents
A kind of large effective area fiber Download PDFInfo
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- CN106199823A CN106199823A CN201610689610.6A CN201610689610A CN106199823A CN 106199823 A CN106199823 A CN 106199823A CN 201610689610 A CN201610689610 A CN 201610689610A CN 106199823 A CN106199823 A CN 106199823A
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- optical fiber
- fiber
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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
-
- 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
Abstract
The present invention relates to a kind of large effective area fiber, optical fiber mode field diameter at 1550nm is 12.0 ~ 13.6 μm, and mode field area is more than or equal to 120 μm2Including sandwich layer, covering and coating the most successively, sandwich layer is silica glass layer, and radius is 5 ~ 7 μm, inner cladding is fluorine doped inner cladding, refractive index contrast is 0.4 ~ 0.2%, and middle cladding radius r3 is 12 ~ 25 μm, and surrounding layer is quartz glass layer, its radius r4 is 25 ~ 45 μm, coating includes undercoating and external coating, a diameter of 192 μm of undercoating, and outer coating diameter is 245 μm.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 a kind of 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 a kind of large effective area fiber.
For solving above-mentioned technical problem, the technical scheme is that a kind of large effective area fiber, its innovative point exists
In: described optical fiber mode field diameter at 1550nm is 12.0 ~ 13.6 μm, and mode field area is more than or equal to 120 μm2, from inside to outside
Including that sandwich layer, covering and coating, described sandwich layer are silica glass layer successively, its radius is 5 ~ 7 μm, and its out-of-roundness is
1.5%, described covering includes inner cladding, middle covering and surrounding layer, and described inner cladding is fluorine doped inner cladding, its radius r2 is 5 ~
12 μm, refractive index contrast is-0.4 ~-0.2%, and described middle cladding radius r3 is 12 ~ 25 μm, and described surrounding layer is quartz glass
Layer, its radius r4 is 25 ~ 45 μm, and this covering entirety out-of-roundness is 0.2%, and described coating material uses polyacrylate, including interior
Coating and external coating, a diameter of 192 μm of described undercoating, its out-of-roundness is 0.6%, and described outer coating diameter is 245 μm, its
Out-of-roundness is 0.8%.
Further, described optical fiber attenuation quotient at 1550nm is less than or equal to 0.165dB/km, declining at 1625
Subtract coefficient less than or equal to 0.19dB/km.
Further, described optical fiber discontinuity at 1550nm is less than or equal to 0.05dB.
Further, described optical fiber chromatic dispersion gradient at 1550nm is less than or equal to 0.07ps/nm2* km, abbe number is little
In equal to 22ps/nm*km.
Further, described optical fiber within temperature 20 ~ 30, relative humidity within 40% ~ 70%, optical fiber resisting fatigue parameter
More than 25.
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 silicon dioxide
Glassy 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, and inner cladding is
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, outward
Covering is 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 polypropylene
Acid esters, 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 2000 ~ 2200 DEG C, and prefabricated rods is at fiber drawing furnace body of heater
Interior melt drawing, hauling speed is >=2000m/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 800 ~ 1200 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 ~ 30 DEG C, ambient humidity 40 ~ 70%, 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 (5)
1. a large effective area fiber, it is characterised in that: described optical fiber mode field diameter at 1550nm is 12.0 ~ 13.6 μ
M, mode field area is more than or equal to 120 μm2, include that sandwich layer, covering and coating, described sandwich layer are silicon dioxide the most successively
Glassy layer, its radius is 5 ~ 7 μm, and its out-of-roundness is 1.5%, and described covering includes inner cladding, middle covering and surrounding layer, described
Inner cladding is fluorine doped inner cladding, and its radius r2 is 5 ~ 12 μm, and refractive index contrast is-0.4 ~-0.2%, described middle cladding radius r3
Being 12 ~ 25 μm, described surrounding layer is quartz glass layer, and its radius r4 is 25 ~ 45 μm, and this covering entirety out-of-roundness is 0.2%, institute
State coating material and use polyacrylate, including undercoating and external coating, a diameter of 192 μm of described undercoating, its out-of-roundness
Being 0.6%, described outer coating diameter is 245 μm, and its out-of-roundness is 0.8%.
2. to remove a kind of large effective area fiber described in 1 according to right, it is characterised in that: described optical fiber declining at 1550nm
Subtract coefficient and be less than or equal to 0.19dB/km less than or equal to 0.165dB/km, the attenuation quotient at 1625.
A kind of large effective area fiber the most according to claim 1, it is characterised in that: described optical fiber at 1550nm not
Seriality is less than or equal to 0.05dB.
A kind of large effective area fiber the most according to claim 1, it is characterised in that: described optical fiber color at 1550nm
Dissipate slope less than or equal to 0.07ps/nm2* km, abbe number is less than or equal to 22ps/nm*km.
A kind of large effective area fiber the most according to claim 1, it is characterised in that: described optical fiber is 20 ~ 30 in temperature
Within DEG C, relative humidity is within 40% ~ 70%, and optical fiber resisting fatigue parameter is more than 25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610689610.6A CN106199823A (en) | 2016-08-19 | 2016-08-19 | A kind of large effective area fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610689610.6A CN106199823A (en) | 2016-08-19 | 2016-08-19 | A kind of large effective area fiber |
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| Publication Number | Publication Date |
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| CN106199823A true CN106199823A (en) | 2016-12-07 |
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ID=57522285
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610689610.6A Withdrawn CN106199823A (en) | 2016-08-19 | 2016-08-19 | A kind of large effective area fiber |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132614A (en) * | 2017-06-27 | 2017-09-05 | 浙江富通光纤技术有限公司 | Large effective area fiber |
| 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 |
-
2016
- 2016-08-19 CN CN201610689610.6A patent/CN106199823A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132614A (en) * | 2017-06-27 | 2017-09-05 | 浙江富通光纤技术有限公司 | Large effective area fiber |
| 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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| WW01 | Invention patent application withdrawn after publication |