CN107382050A - A kind of ultra-low-loss fiber and preparation method thereof - Google Patents

A kind of ultra-low-loss fiber and preparation method thereof Download PDF

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CN107382050A
CN107382050A CN201710729939.5A CN201710729939A CN107382050A CN 107382050 A CN107382050 A CN 107382050A CN 201710729939 A CN201710729939 A CN 201710729939A CN 107382050 A CN107382050 A CN 107382050A
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blowtorch
passed
gas
flow
loose
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CN107382050B (en
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陈海斌
陈剑
陈强
李庆国
简晓松
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Chengdu Futong Optical Communication Technologies Co Ltd
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Chengdu Futong Optical Communication Technologies Co Ltd
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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
    • C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
    • C03B37/01815—Reactant deposition burners or deposition heating means
    • 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
    • C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

The invention provides a kind of preparation method of ultra-low-loss fiber, including step：A the mandrel loose body for being followed successively by sandwich layer loose media, silica barrier layer and covering loose media from the inside to the outside) is prepared using VAD methods, is deposited using the first blowtorch, the second blowtorch and the 3rd blowtorch, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, form sandwich layer loose media；The gas for being passed through second blowtorch is H2And O2, silica barrier layer is formed, is passed through the second blowtorch H2Flow be 12~15L/min, be passed through the second blowtorch O2Flow be 10~12L/min；The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, form covering loose media；B) mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods；C) by the prefabricated stick drawn wire, ultra-low-loss fiber is obtained.

Description

A kind of ultra-low-loss fiber and preparation method thereof
Technical field
The invention belongs to technical field of optical fiber, and in particular to a kind of ultra-low-loss fiber and preparation method thereof.
Background technology
With the rapid development of information technology, substantial amounts of data message needs fast and accurately to transmit, therefore communication class light Fibre requires bigger message capacity, realizes the quick transmission of big data；Lower attenuation loss is required, realizes information Long range transmission.At present, by feedstock purification and the improvement of itself, the limit has almost been arrived in the optimization on decay indices (optimizing water peak), decay have been reduced to 0.185dB/Km.Decay is further reduced, can only be by reducing fiber core Doping, both reduce Rayleigh scattering loss.A kind of method for reducing Rayleigh scattering is that fibre core undopes, and doped cladding layer F is rolled over reducing Penetrate rate.
VAD methods prepare fibre-optical mandrel loose media and deposit loose media using two lamps, and a lamp is passed through unstrpped gas and doping Gas, deposition form fibre core loose media, and another lamp is only passed through unstrpped gas, and deposition forms covering loose media.Two lamp longitudinal directions Arrangement, fibre core loose media grow simultaneously with covering loose media.The GeO adulterated in fibre core2Stability is preferable, is not in covering The situation of diffusion.However, ultra-low-loss fiber requires to mix less in fibre core or does not mix GeO2, F elements are mixed in covering, reduce refraction Rate.Doped cladding layer F chemical equation is as follows：
But when preparing mandrel loose body using VAD methods at present, react the fluorine silica stability extreme difference of generation, covering In F elements be likely to be diffused into fibre core loose media, after sintering, the refractive index of fibre core also reduces, the refraction of sandwich layer and covering Rate difference does not reach requirement, so as to increase the decay of obtained optical fiber.
The content of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of ultra-low-loss fiber and preparation method thereof, The preparation method of ultra-low-loss fiber provided by the invention is prepared using VAD methods has the plug of silica barrier layer loose Body, it can effectively prevent the F elements diffusions in covering from, into fibre core loose media, expire the sandwich layer of optical fiber and the refringence of covering Foot requires, so as to realize the preparation of ultralow attenuating fiber.
The invention provides a kind of preparation method of ultra-low-loss fiber, comprise the following steps：
A) prepared using VAD methods and be followed successively by sandwich layer loose media, silica barrier layer and covering loose media from the inside to the outside Mandrel loose body, deposited using the first blowtorch, the second blowtorch and the 3rd blowtorch, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, form sandwich layer loose media；The gas for being passed through second blowtorch is H2And O2, form silica barrier Layer, it is passed through the H of second blowtorch2Flow be 12~15L/min, be passed through the O of second blowtorch2Flow for 10~ 12L/min；The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, form covering loose media；
B) mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods；
C) by the prefabricated stick drawn wire, ultra-low-loss fiber is obtained.
Preferably, first blowtorch, the second blowtorch and the 3rd blowtorch are arranged in order from the bottom to top.
Preferably, first blowtorch be arranged in parallel with the second blowtorch, and the angle of first blowtorch and horizontal plane is 38 ° ~50 °, the angle of the 3rd blowtorch and horizontal plane is 35 °~45 °.
Preferably, the first blowtorch socket to the length of flame of the mandrel loose body is 40~50mm, described second Blowtorch socket to the length of flame of the mandrel loose body is 80~90mm, the 3rd blowtorch socket to the mandrel loose body The length of flame be 120~160mm.
Preferably, the distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 70 ~80mm, the distance of the line of the central point of the central point of the second blowtorch socket and the 3rd blowtorch socket for 100~ 130mm。
Preferably, first blowtorch includes being located at center to supply oxygen and SiCl4Mixed gas raw material supply To pipe, and on the outside of the raw material supply pipe in concentric circles configuration seven layers of gas flow path, seven layers of gas flow path by First blowtorch center is outwards passed through hydrogen, hydrogen, argon gas, oxygen, argon gas, hydrogen and argon gas successively, is passed through the raw material supply The flow of the oxygen of pipe is 13~15L/min, SiCl4Flow be 2~3g/min；It is passed through the gas of seven layers of gas flow path Flow 0.2~0.5L/min, 2~4L/min, 2~3L/min, 15~17L/min, 3 are outwards followed successively by by the first blowtorch center ~4L/min, 13~17L/min and 4~5L/min；
Second blowtorch include center to supply the pipeline of hydrogen and it is described supply hydrogen pipeline on the outside of be in The pipeline of the supply oxygen of concentric circles configuration；
3rd blowtorch includes center to supply oxygen and SiCl4Mixed gas raw material supply pipe, Yi Ji In seven layers of gas flow path of concentric circles configuration on the outside of the raw material supply pipe, seven layers of gas flow path is by the 3rd blowtorch center Outwards hydrogen, hydrogen, argon gas and CF are passed through successively4Mixed gas, oxygen, argon gas, hydrogen and argon gas, be passed through the raw material and supply Flow to the oxygen of pipe is 25~27L/min, SiCl4Flow be 15~25g/min, be passed through seven layers of gas flow path The flow of gas is outwards followed successively by 2~3L/min, 3~5L/min, 3~7L/min, 35~40L/min, 4 by the first blowtorch center ~5L/min, 35~45L/min, 6~7L/min, wherein, the argon gas and CF4The total flow of mixed gas be 3~7L/ Min, the flow of argon gas is 2~3L/min, CF4Flow be 1~4L/min.
Preferably, the deposition length that the VAD methods prepare mandrel loose body is 500~1100mm, the sandwich layer loose media A diameter of 23.8~24.3mm, the thickness of the silica barrier layer is 0.8~1.2mm, the thickness of the covering loose media Spend for 50~60mm.
Preferably, the density of the sandwich layer loose media is 0.2~0.25g/cm3, the density of the silica barrier layer For 0.9~1.13g/cm3, the density of the covering loose media is 0.28~0.33g/cm3。
Preferably, the furnace temperature of the wire drawing is 1950~2050 DEG C, and the tension force of the wire drawing is 100~230g, described The linear velocity of wire drawing is 980~1050m/min, and the length of optical fiber is 8~15km after the wire drawing.
Present invention also offers a kind of ultra-low-loss fiber, prepare the mandrel loose body of the ultra-low-loss fiber by it is interior extremely It is followed successively by sandwich layer loose media, silica barrier layer and covering loose media, damage of the ultra-low-loss fiber at 1550nm outside Consumption≤0.172dB/km.
Compared with prior art, the invention provides a kind of preparation method of ultra-low-loss fiber, comprise the following steps：A) The mandrel loose body for being followed successively by sandwich layer loose media, silica barrier layer and covering loose media from the inside to the outside is prepared using VAD methods, Deposited using the first blowtorch, the second blowtorch and the 3rd blowtorch, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, form sandwich layer loose media；The gas for being passed through second blowtorch is H2And O2, silica barrier layer is formed, is passed through institute State the H of the second blowtorch2Flow be 12~15L/min, be passed through the O of second blowtorch2Flow be 10~12L/min；It is passed through The gas of 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, form covering loose media；B) mandrel loose body passes through successively Cross dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods；C) by the prefabricated stick drawn wire, ultralow damage is obtained Deplete fibre.The present invention is improved the temperature of core bag interface in deposition of core layer loose media and covering loose media, using oxyhydrogen flame, The silica of interface is suitably shunk, form the larger barrier layer of density, can effectively prevent the F elements diffusions in covering Into fibre core loose media, the sandwich layer of optical fiber and the refringence of covering is set to meet to require, so as to realize the system of ultralow attenuating fiber It is standby.
As a result show, loss≤0.172dB/km of the ultra-low-loss fiber provided by the invention at 1550nm.
Brief description of the drawings
Fig. 1 is the Density Distribution schematic diagram of mandrel loose body prepared by the present invention；
Fig. 2 is using silica barrier layer shaping schematic view during VAD methods preparation mandrel loose body；
Fig. 3 is precast rod refractivity distribution schematic diagram.
Embodiment
The invention provides a kind of preparation method of ultra-low-loss fiber, comprise the following steps：
A) prepared using VAD methods and be followed successively by sandwich layer loose media, silica barrier layer and covering loose media from the inside to the outside Mandrel loose body, deposited using the first blowtorch, the second blowtorch and the 3rd blowtorch, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, form sandwich layer loose media；The gas for being passed through second blowtorch is H2And O2, form silica barrier Layer, it is passed through the H of second blowtorch2Flow be 12~15L/min, be passed through the O of second blowtorch2Flow for 10~ 12L/min；The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, form covering loose media；
B) mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods；
C) by the prefabricated stick drawn wire, ultra-low-loss fiber is obtained.
The present invention prepares mandrel loose body using VAD (axial chemical vapour deposition technique) method, wherein, it is described to use VAD methods Prepare in the cavity of the device of mandrel loose body and be provided with the first blowtorch, the second blowtorch and the 3rd blowtorch.Preferably, described first Blowtorch, the second blowtorch and the 3rd blowtorch are arranged in order from the bottom to top.
Wherein, first blowtorch is used for deposition of core layer loose media, and the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, first blowtorch positioned at center including supplying oxygen and SiCl4Mixed gas raw material supply pipe, Yi Ji In seven layers of gas flow path of concentric circles configuration on the outside of the raw material supply pipe, seven layers of gas flow path is by the first blowtorch center Hydrogen, hydrogen, argon gas, oxygen, argon gas, hydrogen and argon gas are outwards passed through successively, are passed through the stream of the oxygen of the raw material supply pipe Measure as 13~15L/min, SiCl4Flow be 2~3g/min；The flow of the gas of seven layers of gas flow path is passed through by first Blowtorch center is outwards followed successively by 0.2~0.5L/min, 2~4L/min, 2~3L/min, 15~17L/min, 3~4L/min, 13 ~17L/min and 4~5L/min.Wherein, the temperature of the sandwich layer loose media is 750~1000 DEG C.
Second blowtorch is used to improve sandwich layer loose media surface temperature, wherein the gas being passed through is H2And O2.Wherein, institute Stating the second blowtorch includes center to supply the pipeline of hydrogen and match somebody with somebody on the outside of the pipeline of the supply hydrogen in concentric circles The pipeline for the supply oxygen put.Second blowtorch is the key to form barrier layer, using the oxyhydrogen flame of the second blowtorch by the core of formation The loose temperature of layer improves, and the hydrogen flowing quantity in the second blowtorch is 12~15L/min, preferably 13~14L/min；Oxygen flow Oxyhydrogen flame to be formed during 10~12L/min, preferably 10.5~11.5L/min can improve the surface temperature of sandwich layer loose media To 900~960 DEG C, because the part of temperature improves, the SiO on sandwich layer loose media surface2Particle is started to shrink at, and sandwich layer loose media is received Contracting forms silica barrier layer on surface, when the density of the barrier layer is more than 0.85g/cm3When, it can effectively prevent covering Diffusions of the F toward sandwich layer.
3rd blowtorch is used to deposit covering loose media, and the gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4 And CF4, the 3rd blowtorch includes center supplying oxygen and SiCl4Mixed gas raw material supply pipe, and described It is outside by the 3rd blowtorch center in seven layers of gas flow path of concentric circles configuration, seven layers of gas flow path on the outside of raw material supply pipe Hydrogen, hydrogen, argon gas and CF are passed through successively4Mixed gas, oxygen, argon gas, hydrogen and argon gas, be passed through the raw material supply pipe The flow of oxygen be 25~27L/min, SiCl4Flow be 15~25g/min, be passed through the gas of seven layers of gas flow path Flow by the first blowtorch center be outwards followed successively by 2~3L/min, 3~5L/min, 3~7L/min, 35~40L/min, 4~ 5L/min, 35~45L/min, 6~7L/min, wherein, the argon gas and CF4The total flow of mixed gas be 3~7L/min, The flow of argon gas is 2~3L/min, CF4Flow be 1~4L/min.
First blowtorch, the second blowtorch and the 3rd blowtorch are arranged on the dress that VAD methods prepare mandrel loose body from the bottom to top In the cavity put, first blowtorch be arranged in parallel with the second blowtorch, can be by described according to the size requirements to sandwich layer external diameter The angle of first blowtorch and horizontal plane adjusts, preferably 38 °~50 °, more preferably 42 °~46 °, the 3rd blowtorch and water The angle of plane is 35 °~45 °, preferably 37 °~41 °.
The distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 70~80mm, Preferably 73~77mm, the distance of the central point of the second blowtorch socket and the line of the central point of the 3rd blowtorch socket It is adjusted according to the needs of cladding thickness between 100~130mm, preferably 110~120mm.
The first blowtorch socket to the length of flame of the mandrel loose body is 40~50mm, preferably 43~47mm； The second blowtorch socket to the length of flame of the mandrel loose body is 80~90mm, preferably 83~87mm；Described 3rd Blowtorch socket to the length of flame of the mandrel loose body is 120~160mm, preferably 130~150mm.
The present invention is by the position for adjusting three blowtorch and the species and flow of the gas for being passed through blowtorch, by script diameter A diameter of 23.8~24.3mm is retracted to for 25mm or so sandwich layer loose media, 0.8~1.2mm silica is formed on surface Barrier layer.Specifically, the deposition length that the VAD methods prepare mandrel loose body is 500~1100mm, the sandwich layer loose media A diameter of 23.8~24.3mm, the thickness of the silica barrier layer are 0.8~1.2mm, the thickness of the covering loose media For 50~60mm.
Wherein, the density of the sandwich layer loose media is 0.2~0.25g/cm3, the density of the covering loose media is 0.28 ~0.33g/cm3.The density of the silica barrier layer is 0.9~1.13g/cm3, preferably 0.95~1.05g/cm3.It is real Verify it is bright, when the density of the barrier layer is more than 0.85g/cm3When, it can effectively prevent diffusions of the covering F toward sandwich layer.Formed Silica barrier layer together grows with sandwich layer and covering, obtains including the mandrel loose body of silica barrier layer.Referring to Fig. 1, Fig. 1 are the Density Distribution schematic diagram of mandrel loose body prepared by the present invention.In Fig. 1, a is that the density of sandwich layer loose media is big Small, b is the density size of covering loose media, and c is the density size of silica barrier layer；α be sandwich layer loose media radius, D For the radius of mandrel loose body.
Finally, the mandrel loose body obtained is followed successively by sandwich layer loose media, silica barrier layer and covering pine from the inside to the outside Granular media.
Referring to Fig. 2, Fig. 2 is using silica barrier layer shaping schematic view during VAD methods preparation mandrel loose body.Figure In 2, blowtorch one is the first blowtorch, and blowtorch two is the second blowtorch, and blowtorch three is the 3rd blowtorch, and θ 1 is the first blowtorch and horizontal plane The angle of the angle of angle, the blowtorch of θ 2 second and horizontal plane, the blowtorch of θ 3 the 3rd and horizontal plane.Will using the oxyhydrogen flame of the second blowtorch The loose temperature of sandwich layer of formation improves, because the part of temperature improves, the SiO on sandwich layer loose media surface2Particle starts to shrink at, Sandwich layer loose media is contracted in surface and forms silica barrier layer.
The mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods.This Invention is not specifically limited to the method that prefabricated rods are prepared, and well known to a person skilled in the art be dehydrated, sinter, prolong Stretch, lose wash, surface formed surrounding layer method.
Barrier effect using silica barrier layer to covering F, while cladding index is reduced, keep well The pure SiO of sandwich layer2Refractive index.
Referring to Fig. 3, Fig. 3 is precast rod refractivity distribution schematic diagram.Wherein, the fibre core by the mandrel loose body core Layer loose media and silica barrier layer are prepared, and have higher refractive index, it is loose by the plug to mix the coverings of F first Covering loose media in body is prepared, and refractive index is relatively low；It is the surrounding layer to mix the coverings of F second, and its refractive index is between described Fiber core refractive index and mix between the cladding indexs of F first.Δ-For fiber core refractive index and the difference for mixing the cladding indexs of F second, Δ ' mix the cladding indexs of F second and mix the difference of the cladding indexs of F first.
Wherein, the refractive index of the sandwich layer is 1.4572, and it is 1.45195~1.45283 to mix the cladding indexs of F first, fine Core refractive index and difference DELTA=- 0.3%~-0.36% for mixing the cladding indexs of F first.
The prefabricated rods most obtained at last carry out wire drawing, obtain ultra-low-loss fiber.
In the present invention, the furnace temperature of the wire drawing is 1950~2050 DEG C, and the tension force of the wire drawing is 100~230g, The linear velocity of the wire drawing is 980~1050m/min, and the length of optical fiber is 8~15km after the wire drawing.
Present invention also offers the ultra-low-loss fiber that a kind of above-mentioned preparation method is prepared, the ultra-low loss is prepared The mandrel loose body of optical fiber is followed successively by sandwich layer loose media, silica barrier layer and covering loose media from the inside to the outside, described ultralow Loss≤0.172dB/km of the loss optical fiber at 1550nm.
The present invention is put forward the temperature of core bag interface using oxyhydrogen flame in deposition of core layer loose media and covering loose media Height, the silica of interface is suitably shunk, form the larger barrier layer of density, can effectively prevent the F elements in covering It is diffused into fibre core loose media, makes the sandwich layer of optical fiber and the refringence of covering meet to require, so as to realize ultralow attenuating fiber Preparation.
As a result show, loss≤0.172dB/km of the ultra-low-loss fiber provided by the invention at 1550nm.
For a further understanding of the present invention, with reference to embodiment to ultra-low-loss fiber provided by the invention and its preparation Method is illustrated, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
Mandrel loose body is prepared using VAD methods, wherein, set in the cavity for the device that mandrel loose body is prepared using VAD methods It is equipped with the first blowtorch being arranged in order from the bottom to top, the second blowtorch and the 3rd blowtorch.
Wherein, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, first blowtorch is including being located at center To supply oxygen (being represented with O1) and SiCl4Mixed gas raw material supply pipe, and on the outside of the raw material supply pipe The seven layers of gas flow path configured in concentric circles, seven layers of gas flow path are outwards passed through hydrogen successively by the first blowtorch center (being represented with H1), hydrogen (being represented with H2), argon gas (being represented with Ar1), oxygen (being represented with O2), argon gas (being represented with Ar2), hydrogen (being represented with H3) and argon gas (being represented with Ar3)；Wherein, it is passed through the H of first blowtorch2Flow be H1:0.25L/min,H2: 3L/min,H3:15L/min, the O for being passed through first blowtorch2Flow be O1:13.5L/min,O2：15.5L/min, be passed through The Ar of first blowtorch flow is Ar1：2.5L/min, Ar2：3L/min, Ar3:4L/min and be passed through it is described first spray The SiCl of lamp4Flow be 2.1g/min.
Second blowtorch include center to supply the pipeline of hydrogen and it is described supply hydrogen pipeline on the outside of be in The pipeline of the supply oxygen of concentric circles configuration, it is passed through the H of second blowtorch2Flow for 12L/min, be passed through described second The O of blowtorch2Flow be 10L/min.
The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, the 3rd blowtorch include center with for To oxygen (being represented with O3) and SiCl4Mixed gas raw material supply pipe, and in concentric on the outside of the raw material supply pipe Seven layers of gas flow path of round shape configuration, seven layers of gas flow path are outwards passed through hydrogen by the first blowtorch center and (use H4 tables successively Show), hydrogen (being represented with H5), argon gas (being represented with Ar4) and CF4Mixed gas, oxygen (being represented with O4), argon gas (use Ar5 tables Show), hydrogen (being represented with H6) and argon gas (being represented with Ar6), be passed through the H of the 3rd blowtorch2Flow be H4:2.5L/min, H5:3.5L/min,H6:35L/min, it is passed through the O of the 3rd blowtorch2Flow be O3:26L/min,O4：36L/min, it is passed through The Ar of 3rd blowtorch flow is Ar4：2.5L/min, Ar5：4L/min, Ar6:6L/min, it is passed through the 3rd blowtorch SiCl4Flow be 18g/min, be passed through the CF of the 3rd blowtorch4Flow be 1.5L/min.
The first blowtorch socket to the length of flame of the mandrel loose body is 45mm；The second blowtorch socket is to institute The length of flame for stating mandrel loose body is 85mm；The 3rd blowtorch socket to the length of flame of the mandrel loose body is 135mm。
The distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 70mm, described The distance of the line of the central point of second blowtorch socket and the central point of the 3rd blowtorch socket is 120mm
After the completion of the parameter setting of three blowtorch, the deposition that blowtorch carries out mandrel loose body is opened, utilizes the second blowtorch The loose temperature of the sandwich layer of formation is brought up to 900~960 DEG C by oxyhydrogen flame, because the part of temperature improves, the loose body surface of sandwich layer The SiO in face2Particle starts to shrink at, and sandwich layer loose media is contracted in surface and forms silica barrier layer, obtains from the inside to the outside successively For the mandrel loose body of sandwich layer loose media, silica barrier layer and covering loose media.
Wherein, the length of mandrel loose body deposition is 800mm, a diameter of 23.9mm of the sandwich layer loose media, institute The thickness for stating silica barrier layer is 0.85mm, and the thickness of the covering loose media is 58mm.The sandwich layer loose media it is close Spend for 0.22g/cm3, the density of the silica barrier layer is 0.95g/cm3, the density of the covering loose media is 0.3g/ cm3。
By above-mentioned mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods.
The refractive index for determining the sandwich layer of the prefabricated rods is 1.4572, and it is 1.45282 to mix the cladding indexs of F first, sandwich layer Refractive index and difference DELTA=- 0.3% for mixing the cladding indexs of F first.
Obtained prefabricated rods are subjected to wire drawing, obtain ultra-low-loss fiber.
In the present invention, the furnace temperature of the wire drawing is 2050 DEG C, and the tension force of the wire drawing is 115g, the line of the wire drawing Speed is 1000m/min, and the length of optical fiber is 10km after the wire drawing, the optical fiber that numbering is FE14A0098 is obtained, described in measure The performance of optical fiber, the results are shown in Table 1.
The performance test data of optical fiber prepared by the embodiment 1~5 of table 1
Embodiment 2
Mandrel loose body is prepared using VAD methods, wherein, set in the cavity for the device that mandrel loose body is prepared using VAD methods It is equipped with the first blowtorch being arranged in order from the bottom to top, the second blowtorch and the 3rd blowtorch.
Wherein, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, first blowtorch is including being located at center To supply oxygen (being represented with O1) and SiCl4Mixed gas raw material supply pipe, and on the outside of the raw material supply pipe The seven layers of gas flow path configured in concentric circles, seven layers of gas flow path are outwards passed through hydrogen successively by the first blowtorch center (being represented with H1), hydrogen (being represented with H2), argon gas (being represented with Ar1), oxygen (being represented with O2), argon gas (being represented with Ar2), hydrogen (being represented with H3) and argon gas (being represented with Ar3)；Wherein, it is passed through the H of first blowtorch2Flow be H1:0.25L/min,H2: 3L/min,H3:15L/min, the O for being passed through first blowtorch2Flow be O1:13.5L/min,O2：15.5L/min, be passed through The Ar of first blowtorch flow is Ar1：2.5L/min, Ar2：3L/min, Ar3:4L/min and be passed through it is described first spray The SiCl of lamp4Flow be 2.1g/min..
Second blowtorch include center to supply the pipeline of hydrogen and it is described supply hydrogen pipeline on the outside of be in The pipeline of the supply oxygen of concentric circles configuration, it is passed through the H of second blowtorch2Flow for 13L/min, be passed through described second The O of blowtorch2Flow be 11L/min..
The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, the 3rd blowtorch include center with for To oxygen (being represented with O3) and SiCl4Mixed gas raw material supply pipe, and in concentric on the outside of the raw material supply pipe Seven layers of gas flow path of round shape configuration, seven layers of gas flow path are outwards passed through hydrogen by the first blowtorch center and (use H4 tables successively Show), hydrogen (being represented with H5), argon gas (being represented with Ar4) and CF4Mixed gas, oxygen (being represented with O4), argon gas (use Ar5 tables Show), hydrogen (being represented with H6) and argon gas (being represented with Ar6), be passed through the H of the 3rd blowtorch2Flow be H4:2.5L/min, H5:3.5L/min,H6:35L/min, it is passed through the O of the 3rd blowtorch2Flow be O3:26L/min,O4：36L/min, it is passed through The Ar of 3rd blowtorch flow is Ar4：2.5L/min, Ar5：4L/min, Ar6:6L/min, it is passed through the 3rd blowtorch SiCl4Flow be 18g/min, be passed through the CF of the 3rd blowtorch4Flow be 2.5L/min.
The first blowtorch socket to the length of flame of the mandrel loose body is 45mm；The second blowtorch socket is to institute The length of flame for stating mandrel loose body is 85mm；The 3rd blowtorch socket to the length of flame of the mandrel loose body is 135mm。
The distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 70mm, described The distance of the line of the central point of second blowtorch socket and the central point of the 3rd blowtorch socket is 120mm
After the completion of the parameter setting of three blowtorch, the deposition that blowtorch carries out mandrel loose body is opened, utilizes the second blowtorch The loose temperature of the sandwich layer of formation is brought up to 900~960 DEG C by oxyhydrogen flame, because the part of temperature improves, the loose body surface of sandwich layer The SiO in face2Particle starts to shrink at, and sandwich layer loose media is contracted in surface and forms silica barrier layer, obtains from the inside to the outside successively For the mandrel loose body of sandwich layer loose media, silica barrier layer and covering loose media.
Wherein, the length of mandrel loose body deposition is 800mm, a diameter of 24mm of the sandwich layer loose media, described The thickness of silica barrier layer is 1.05mm, and the thickness of the covering loose media is 58mm.The density of the sandwich layer loose media For 0.223g/cm3, the density of the silica barrier layer is 1.02g/cm3, the density of the covering loose media is 0.31g/ cm3。
By above-mentioned mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods.
The refractive index for determining the sandwich layer of the prefabricated rods is 1.4572, and it is 1.45224 to mix the cladding indexs of F first, Δ=- 0.34%.
Obtained prefabricated rods are subjected to wire drawing, obtain ultra-low-loss fiber.
In the present invention, the furnace temperature of the wire drawing is 2000 DEG C, and the tension force of the wire drawing is 150, the line of the wire drawing Speed is 1000m/min, and the length of optical fiber is 14km after the wire drawing, the optical fiber that numbering is FE14A0099 is obtained, described in measure The performance of optical fiber, the results are shown in Table 1.
Embodiment 3
Mandrel loose body is prepared using VAD methods, wherein, set in the cavity for the device that mandrel loose body is prepared using VAD methods It is equipped with the first blowtorch being arranged in order from the bottom to top, the second blowtorch and the 3rd blowtorch.
Wherein, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, first blowtorch is including being located at center To supply oxygen (being represented with O1) and SiCl4Mixed gas raw material supply pipe, and on the outside of the raw material supply pipe The seven layers of gas flow path configured in concentric circles, seven layers of gas flow path are outwards passed through hydrogen successively by the first blowtorch center (being represented with H1), hydrogen (being represented with H2), argon gas (being represented with Ar1), oxygen (being represented with O2), argon gas (being represented with Ar2), hydrogen (being represented with H3) and argon gas (being represented with Ar3)；Wherein, it is passed through the H of first blowtorch2Flow be H1:0.25L/min,H2: 3L/min,H3:15L/min, the O for being passed through first blowtorch2Flow be O1:13.5L/min,O2：15.5L/min, be passed through The Ar of first blowtorch flow is Ar1：2.5L/min, Ar2：3L/min, Ar3:4L/min and be passed through it is described first spray The SiCl of lamp4Flow be 2.1g/min.
Second blowtorch include center to supply the pipeline of hydrogen and it is described supply hydrogen pipeline on the outside of be in The pipeline of the supply oxygen of concentric circles configuration, it is passed through the H of second blowtorch2Flow for 15L/min, be passed through described second The O of blowtorch2Flow be 12L/min.
The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, the 3rd blowtorch include center with for To oxygen (being represented with O3) and SiCl4Mixed gas raw material supply pipe, and in concentric on the outside of the raw material supply pipe Seven layers of gas flow path of round shape configuration, seven layers of gas flow path are outwards passed through hydrogen by the first blowtorch center and (use H4 tables successively Show), hydrogen (being represented with H5), argon gas (being represented with Ar4) and CF4Mixed gas, oxygen (being represented with O4), argon gas (use Ar5 tables Show), hydrogen (being represented with H6) and argon gas (being represented with Ar6), be passed through the H of the 3rd blowtorch2Flow be H4:2.5L/min, H5:3.5L/min,H6:35L/min, it is passed through the O of the 3rd blowtorch2Flow be O3:26L/min,O4：36L/min, it is passed through The Ar of 3rd blowtorch flow is Ar4：2.5L/min, Ar5：4L/min, Ar6:6L/min, it is passed through the 3rd blowtorch SiCl4Flow be 18g/min, be passed through the CF of the 3rd blowtorch4Flow be 4L/min.
The first blowtorch socket to the length of flame of the mandrel loose body is 45mm；The second blowtorch socket is to institute The length of flame for stating mandrel loose body is 85mm；The 3rd blowtorch socket to the length of flame of the mandrel loose body is 135mm。
The distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 70mm, described The distance of the line of the central point of second blowtorch socket and the central point of the 3rd blowtorch socket is 120mm
After the completion of the parameter setting of three blowtorch, the deposition that blowtorch carries out mandrel loose body is opened, utilizes the second blowtorch The loose temperature of the sandwich layer of formation is brought up to 900~960 DEG C by oxyhydrogen flame, because the part of temperature improves, the loose body surface of sandwich layer The SiO in face2Particle starts to shrink at, and sandwich layer loose media is contracted in surface and forms silica barrier layer, obtains from the inside to the outside successively For the mandrel loose body of sandwich layer loose media, silica barrier layer and covering loose media.
Wherein, the length of mandrel loose body deposition is 1000mm, a diameter of 24mm of the sandwich layer loose media, described The thickness of silica barrier layer is 1.15mm, and the thickness of the covering loose media is 58mm.The density of the sandwich layer loose media For 0.22g/cm3, the density of the silica barrier layer is 1.13g/cm3, the density of the covering loose media is 0.29g/ cm3。
By above-mentioned mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods.
The refractive index for determining the sandwich layer of the prefabricated rods is 1.4572, and it is 1.45195 to mix the cladding indexs of F first, Δ=- 0.36%.
Obtained prefabricated rods are subjected to wire drawing, obtain ultra-low-loss fiber.
In the present invention, the furnace temperature of the wire drawing is 1987 DEG C, and the tension force of the wire drawing is 200g, the line of the wire drawing Speed is 1000m/min, and the length of optical fiber is 15km after the wire drawing, the optical fiber that numbering is FE14A0100 is obtained, described in measure The performance of optical fiber, the results are shown in Table 1.
Embodiment 4
Mandrel loose body is prepared using VAD methods, wherein, set in the cavity for the device that mandrel loose body is prepared using VAD methods It is equipped with the first blowtorch being arranged in order from the bottom to top, the second blowtorch and the 3rd blowtorch.
Wherein, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, first blowtorch is including being located at center To supply oxygen (being represented with O1) and SiCl4Mixed gas raw material supply pipe, and on the outside of the raw material supply pipe The seven layers of gas flow path configured in concentric circles, seven layers of gas flow path are outwards passed through hydrogen successively by the first blowtorch center (being represented with H1), hydrogen (being represented with H2), argon gas (being represented with Ar1), oxygen (being represented with O2), argon gas (being represented with Ar2), hydrogen (being represented with H3) and argon gas (being represented with Ar3)；Wherein, it is passed through the H of first blowtorch2Flow be H1:0.4L/min,H2: 3.5L/min,H3:17L/min, the O for being passed through first blowtorch2Flow be O1:15L/min,O2：17L/min, it is passed through institute The flow for stating the Ar of the first blowtorch is Ar1：2.5L/min, Ar2：3L/min, Ar3:4L/min and it is passed through first blowtorch SiCl4Flow be 2.5g/min.
Second blowtorch include center to supply the pipeline of hydrogen and it is described supply hydrogen pipeline on the outside of be in The pipeline of the supply oxygen of concentric circles configuration, it is passed through the H of second blowtorch2Flow for 13L/min, be passed through described second The O of blowtorch2Flow be 11L/min.
The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, the 3rd blowtorch include center with for To oxygen (being represented with O3) and SiCl4Mixed gas raw material supply pipe, and in concentric on the outside of the raw material supply pipe Seven layers of gas flow path of round shape configuration, seven layers of gas flow path are outwards passed through hydrogen by the first blowtorch center and (use H4 tables successively Show), hydrogen (being represented with H5), argon gas (being represented with Ar4) and CF4Mixed gas, oxygen (being represented with O4), argon gas (use Ar5 tables Show), hydrogen (being represented with H6) and argon gas (being represented with Ar6), be passed through the H of the 3rd blowtorch2Flow be H4:2.5L/min, H5:3.5L/min,H6:35L/min, it is passed through the O of the 3rd blowtorch2Flow be O3:26L/min,O4：36L/min, it is passed through The Ar of 3rd blowtorch flow is Ar4：2.5L/min, Ar5：4L/min, Ar6:6L/min, it is passed through the 3rd blowtorch SiCl4Flow be 18g/min, be passed through the CF of the 3rd blowtorch4Flow be 2.5L/min.
The first blowtorch socket to the length of flame of the mandrel loose body is 42mm；The second blowtorch socket is to institute The length of flame for stating mandrel loose body is 83mm；The 3rd blowtorch socket to the length of flame of the mandrel loose body is 125mm。
The distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 70mm, described The distance of the line of the central point of second blowtorch socket and the central point of the 3rd blowtorch socket is 120mm
After the completion of the parameter setting of three blowtorch, the deposition that blowtorch carries out mandrel loose body is opened, utilizes the second blowtorch The loose temperature of the sandwich layer of formation is brought up to 900~960 DEG C by oxyhydrogen flame, because the part of temperature improves, the loose body surface of sandwich layer The SiO in face2Particle starts to shrink at, and sandwich layer loose media is contracted in surface and forms silica barrier layer, obtains from the inside to the outside successively For the mandrel loose body of sandwich layer loose media, silica barrier layer and covering loose media.
Wherein, the length of mandrel loose body deposition is 600mm, a diameter of 23.8mm of the sandwich layer loose media, institute The thickness for stating silica barrier layer is 1.06mm, and the thickness of the covering loose media is 58mm.The sandwich layer loose media it is close Spend for 0.25g/cm3, the density of the silica barrier layer is 1.04g/cm3, the density of the covering loose media is 0.3g/ cm3。
By above-mentioned mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods.
The refractive index for determining the sandwich layer of the prefabricated rods is 1.4572, and it is 1.45239 to mix the cladding indexs of F first, Δ=- 0.33%.
Obtained prefabricated rods are subjected to wire drawing, obtain ultra-low-loss fiber.
In the present invention, the furnace temperature of the wire drawing is 1931 DEG C, and the tension force of the wire drawing is 210g, the line of the wire drawing Speed is 1000m/min, and the length of optical fiber is 8km after the wire drawing, the optical fiber that numbering is FE14A0101 is obtained, described in measure The performance of optical fiber, the results are shown in Table 1.
Embodiment 5
Mandrel loose body is prepared using VAD methods, wherein, set in the cavity for the device that mandrel loose body is prepared using VAD methods It is equipped with the first blowtorch being arranged in order from the bottom to top, the second blowtorch and the 3rd blowtorch.
Wherein, the gas for being passed through first blowtorch is H2、O2, Ar and SiCl4, first blowtorch is including being located at center To supply oxygen (being represented with O1) and SiCl4Mixed gas raw material supply pipe, and on the outside of the raw material supply pipe The seven layers of gas flow path configured in concentric circles, seven layers of gas flow path are outwards passed through hydrogen successively by the first blowtorch center (being represented with H1), hydrogen (being represented with H2), argon gas (being represented with Ar1), oxygen (being represented with O2), argon gas (being represented with Ar2), hydrogen (being represented with H3) and argon gas (being represented with Ar3)；Wherein, it is passed through the H of first blowtorch2Flow be H1:0.25L/min,H2: 3L/min,H3:15L/min, the O for being passed through first blowtorch2Flow be O1:13.5L/min,O2：15.5L/min, be passed through The Ar of first blowtorch flow is Ar1：2.5L/min, Ar2：3L/min, Ar3:4L/min and be passed through it is described first spray The SiCl of lamp4Flow be 2.1g/min.
Second blowtorch include center to supply the pipeline of hydrogen and it is described supply hydrogen pipeline on the outside of be in The pipeline of the supply oxygen of concentric circles configuration, it is passed through the H of second blowtorch2Flow for 13L/min, be passed through described second The O of blowtorch2Flow be 11L/min.
The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, the 3rd blowtorch include center with for To oxygen (being represented with O3) and SiCl4Mixed gas raw material supply pipe, and in concentric on the outside of the raw material supply pipe Seven layers of gas flow path of round shape configuration, seven layers of gas flow path are outwards passed through hydrogen by the first blowtorch center and (use H4 tables successively Show), hydrogen (being represented with H5), argon gas (being represented with Ar4) and CF4Mixed gas, oxygen (being represented with O4), argon gas (use Ar5 tables Show), hydrogen (being represented with H6) and argon gas (being represented with Ar6), be passed through the H of the 3rd blowtorch2Flow be H4:2.5L/min, H5:3.5L/min,H6:35L/min, it is passed through the O of the 3rd blowtorch2Flow be O3:26L/min,O4：36L/min, it is passed through The Ar of 3rd blowtorch flow is Ar4：2.5L/min, Ar5：4L/min, Ar6:6L/min, it is passed through the 3rd blowtorch SiCl4Flow be 25g/min, be passed through the CF of the 3rd blowtorch4Flow be 3.5L/min.
The first blowtorch socket to the length of flame of the mandrel loose body is 50mm；The second blowtorch socket is to institute The length of flame for stating mandrel loose body is 88mm；The 3rd blowtorch socket to the length of flame of the mandrel loose body is 156mm。
The distance of the line of the central point of the central point of the first blowtorch socket and the second blowtorch socket is 75mm, described The distance of the line of the central point of second blowtorch socket and the central point of the 3rd blowtorch socket is 120mm
After the completion of the parameter setting of three blowtorch, the deposition that blowtorch carries out mandrel loose body is opened, utilizes the second blowtorch The loose temperature of the sandwich layer of formation is brought up to 900~960 DEG C by oxyhydrogen flame, because the part of temperature improves, the loose body surface of sandwich layer The SiO in face2Particle starts to shrink at, and sandwich layer loose media is contracted in surface and forms silica barrier layer, obtains from the inside to the outside successively For the mandrel loose body of sandwich layer loose media, silica barrier layer and covering loose media.
Wherein, the length of mandrel loose body deposition is 800mm, a diameter of 24mm of the sandwich layer loose media, described The thickness of silica barrier layer is 1.05mm, and the thickness of the covering loose media is 60mm.The density of the sandwich layer loose media For 0.225g/cm3, the density of the silica barrier layer is 1.02g/cm3, the density of the covering loose media is 0.33g/ cm3。
By above-mentioned mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods.
The refractive index for determining the sandwich layer of the prefabricated rods is 1.4572, and it is 1.45253 to mix the cladding indexs of F first, Δ=- 0.32%.
Obtained prefabricated rods are subjected to wire drawing, obtain ultra-low-loss fiber.
In the present invention, the furnace temperature of the wire drawing is 1875 DEG C, and the tension force of the wire drawing is 260g, the line of the wire drawing Speed is 1000m/min, and the length of optical fiber is 10km after the wire drawing, the optical fiber that numbering is FE14A0102 is obtained, described in measure The performance of optical fiber, the results are shown in Table 1.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (10)

1. a kind of preparation method of ultra-low-loss fiber, it is characterised in that comprise the following steps：
A the plug for being followed successively by sandwich layer loose media, silica barrier layer and covering loose media from the inside to the outside) is prepared using VAD methods Loose media, deposited using the first blowtorch, the second blowtorch and the 3rd blowtorch, the gas for being passed through first blowtorch is H2、O2、 Ar and SiCl4, form sandwich layer loose media；The gas for being passed through second blowtorch is H2And O2, silica barrier layer is formed, is led to Enter the H of second blowtorch2Flow be 12~15L/min, be passed through the O of second blowtorch2Flow be 10~12L/min； The gas for being passed through the 3rd blowtorch is H2、O2、Ar、SiCl4And CF4, form covering loose media；
B) mandrel loose body successively by dehydration, sintering, extension, erosion wash, surface formed surrounding layer obtain prefabricated rods；
C) by the prefabricated stick drawn wire, ultra-low-loss fiber is obtained.
2. preparation method according to claim 1, it is characterised in that first blowtorch, the second blowtorch and the 3rd blowtorch It is arranged in order from the bottom to top.
3. preparation method according to claim 1, it is characterised in that first blowtorch be arranged in parallel with the second blowtorch, The angle of first blowtorch and horizontal plane is 38 °~50 °, and the angle of the 3rd blowtorch and horizontal plane is 35 °~45 °.
4. preparation method according to claim 1, it is characterised in that the first blowtorch socket to the mandrel loose body The length of flame be 40~50mm, the length of flame of the second blowtorch socket to the mandrel loose body is 80~90mm, institute It is 120~160mm to state the 3rd blowtorch socket to the length of flame of the mandrel loose body.
5. preparation method according to claim 1, it is characterised in that the central point of the first blowtorch socket and the second spray The distance of the line of the central point of lamp socket is 70~80mm, the central point of the second blowtorch socket and the 3rd blowtorch lamp The distance of the line of the central point of mouth is 100~130mm.
6. preparation method according to claim 1, it is characterised in that first blowtorch includes being located at center to supply Oxygen and SiCl4Mixed gas raw material supply pipe, and on the outside of the raw material supply pipe in concentric circles configuration seven Layer gas flow path, seven layers of gas flow path are outwards passed through hydrogen, hydrogen, argon gas, oxygen, argon successively by the first blowtorch center Gas, hydrogen and argon gas, the flow for being passed through the oxygen of the raw material supply pipe are 13~15L/min, SiCl4Flow be 2~3g/ min；Be passed through the flow of the gas of seven layers of gas flow path by the first blowtorch center be outwards followed successively by 0.2~0.5L/min, 2~ 4L/min, 2~3L/min, 15~17L/min, 3~4L/min, 13~17L/min and 4~5L/min；
Second blowtorch includes center to supply the pipeline of hydrogen and on the outside of the pipeline of the supply hydrogen in concentric The pipeline of the supply oxygen of round shape configuration；
3rd blowtorch includes center to supply oxygen and SiCl4Mixed gas raw material supply pipe, and in the original Expect supply pipe on the outside of in concentric circles configuration seven layers of gas flow path, seven layers of gas flow path by the 3rd blowtorch center outwards according to It is secondary to be passed through hydrogen, hydrogen, argon gas and CF4Mixed gas, oxygen, argon gas, hydrogen and argon gas, be passed through the raw material supply pipe The flow of oxygen is 25~27L/min, SiCl4Flow be 15~25g/min, be passed through the gas of seven layers of gas flow path Flow is outwards followed successively by 2~3L/min, 3~5L/min, 3~7L/min, 35~40L/min, 4~5L/ by the first blowtorch center Min, 35~45L/min, 6~7L/min, wherein, the argon gas and CF4The total flow of mixed gas be 3~7L/min, argon The flow of gas is 2~3L/min, CF4Flow be 1~4L/min.
7. preparation method according to claim 1, it is characterised in that the VAD methods prepare the deposition length of mandrel loose body Spend and be for 500~1100mm, a diameter of 23.8~24.3mm of the sandwich layer loose media, the thickness of the silica barrier layer 0.8~1.2mm, the thickness of the covering loose media is 50~60mm.
8. preparation method according to claim 1, it is characterised in that the density of the sandwich layer loose media be 0.2~ 0.25g/cm3, the density of the silica barrier layer is 0.9~1.13g/cm3, the density of the covering loose media is 0.28 ~0.33g/cm3。
9. preparation method according to claim 1, it is characterised in that the furnace temperature of the wire drawing is 1950~2050 DEG C, The tension force of the wire drawing is 100~230g, and the linear velocity of the wire drawing is 980~1050m/min, the length of optical fiber after the wire drawing Spend for 8~15km.
A kind of 10. ultra-low-loss fiber, it is characterised in that prepare the mandrel loose body of the ultra-low-loss fiber from the inside to the outside according to Secondary is sandwich layer loose media, silica barrier layer and covering loose media, loss of the ultra-low-loss fiber at 1550nm≤ 0.172dB/km。
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