CN113582534B - Method and apparatus for manufacturing optical fiber - Google Patents
Method and apparatus for manufacturing optical fiber Download PDFInfo
- Publication number
- CN113582534B CN113582534B CN202111020397.7A CN202111020397A CN113582534B CN 113582534 B CN113582534 B CN 113582534B CN 202111020397 A CN202111020397 A CN 202111020397A CN 113582534 B CN113582534 B CN 113582534B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- drawing tension
- coating layer
- target
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—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
- C03B37/07—Controlling or regulating
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
The invention provides a preparation method and a device of an optical fiber, and relates to the technical field of optical fibers. The preparation method of the optical fiber comprises the following steps: providing an optical fiber preform; melting and drawing the optical fiber preform in a target drawing tension range to form an optical fiber main body; annealing the optical fiber main body; coating the annealed optical fiber main body to form an inner coating layer and an outer coating layer; curing the coated optical fiber main body to form an optical fiber; and taking the optical fiber to a fiber take-up disc. The preparation device of the optical fiber comprises a rod feeding mechanism, a wire drawing furnace, an annealing device, a coating device, a curing device and a traction mechanism. The mode field diameter of the optical fiber meets the mode field diameter of the G.652-class trunk optical fiber through the target drawing tension range of drawing the fused optical fiber preform into the optical fiber main body, and the bending resistance of the optical fiber meets the bending resistance of the G.657-class optical fiber through reasonable matching of coating parameters of the inner and outer coating layers and reasonable matching of the coating curing degree.
Description
Technical Field
The invention relates to the technical field of optical fibers, in particular to a preparation method and a preparation device of an optical fiber.
Background
With the continuous development of FTTH, optical fibers face complex construction environments such as corridors, corners of walls or rooms in many cases, which requires that the optical fibers have good bending resistance, so that the optical fibers can still ensure normal transmission of signals under the condition of small bending radius.
In the related art, in order to achieve better bending performance of the optical fiber, it is common to reduce the mode field diameter of the optical fiber or increase the cutoff wavelength of the optical fiber, and considering that the cutoff wavelength must be less than 1260nm after the optical fiber is cabled, there is a limit to a space for improving the bending performance of the optical fiber by increasing the cutoff wavelength of the optical fiber, and it is common practice to reduce the mode field diameter of the optical fiber.
However, when the optical fiber having the bending resistance of the g.657-type optical fiber is fusion-spliced to the g.652-type trunk optical fiber by reducing the mode field diameter, there is a problem that the optical signal stability is poor.
Disclosure of Invention
The invention provides a preparation method of an optical fiber and a device thereof, which are used for solving the problem of poor optical signal stability when the optical fiber with bending loss reduced by reducing the mode field diameter of the optical fiber is welded with a main optical fiber.
In one aspect, the present invention provides a method for preparing an optical fiber, comprising the steps of:
providing an optical fiber preform;
melting and drawing the optical fiber preform in a target drawing tension range to form an optical fiber main body;
annealing the optical fiber main body;
coating the annealed optical fiber main body to form an inner coating layer and an outer coating layer;
curing the coated optical fiber main body to form an optical fiber;
collecting the optical fiber onto a fiber collecting disc;
wherein the elastic modulus of the coating used by the inner coating layer is less than or equal to 1.5Mpa after being cured, the viscosity is 1500-3000 mPa s, and the elongation at break is more than or equal to 120%; the elastic modulus of the coating used for the outer coating layer after curing is larger than or equal to 550Mpa, the viscosity is 1500-3500 mPa.s, and the elongation at break is larger than or equal to 5%; the curing degree of the inner coating layer is 85% -95%, and the curing degree of the outer coating layer is 92% -100%.
Optionally, the current drawing tension of the annealed optical fiber body is obtained, and the drawing speed of the optical fiber body is adjusted in a manner of reducing the difference between the current drawing tension and the target drawing tension range according to the comparison between the current drawing tension and the target drawing tension range.
Optionally, if the current drawing tension is greater than a first target drawing tension, reducing the drawing speed of the optical fiber main body;
if the current drawing tension is smaller than a second target drawing tension, improving the drawing speed of the optical fiber main body;
the first target wire drawing tension is the target wire drawing tension plus 1, and the second target wire drawing tension is the target wire drawing tension minus 1; and the target drawing tension is the tension of the optical fiber which meets the requirements of the cut-off wavelength of the optical fiber and the bending loss of the optical fiber at the target drawing speed.
Optionally, the coating the annealed optical fiber main body to form an inner coating layer and an outer coating layer includes:
coating the material of the inner coating layer on the annealed optical fiber main body through a mold;
coating the material of the outer coating layer on the inner coating layer through the mold;
wherein the outer wall of the die is provided with a feed chute and a feed inlet, the feed chute comprises a folding line chute and a curved chute, the bent line groove is communicated with the center of the curved line groove, and the two ends of the curved line groove are provided with the feed inlets; the radius of the inner coating layer ranges from 72.5 to 77.5 microns, the maximum radius of the outer coating layer ranges from 87.5 microns to 92.5 microns, and the ratio of the thickness value of the inner coating layer to the thickness value of the inner coating layer is 1.
Optionally, the curing the coated optical fiber body to form an optical fiber specifically includes:
and curing the coated optical fiber main body through a curing furnace with preset power and preset quantity to form the optical fiber.
Optionally, placing the fiber collecting disc filled with the optical fibers in a nitrogen atmosphere for heat treatment;
wherein the purity of the nitrogen in the nitrogen atmosphere is greater than or equal to 99.999 percent, and the time for carrying out heat treatment on the optical fiber on the fiber collecting disc in the nitrogen atmosphere is 4-24 hours.
Optionally, the providing an optical fiber preform specifically includes:
preparing a germanium-doped silicon dioxide powder body by adopting an axial vapor deposition method;
carrying out dehydroxylation sintering on the germanium-doped silicon dioxide powder body to prepare a core rod;
preparing a sunken layer on the outer side of the core rod by adopting an axial vapor deposition method;
preparing an outer cladding layer on the outer side of the sunken layer of the optical fiber preform by adopting an axial vapor deposition method;
wherein the relative refractive index of the core rod relative to the outer cladding is 0.34-0.38%; the relative refractive index of the depressed layer relative to the outer cladding layer is-0.07% to-0.1%.
On the other hand, the invention also provides a preparation device of the optical fiber, which comprises a rod feeding mechanism, a wire drawing furnace, an annealing device, a coating device, a curing device and a traction mechanism;
the rod feeding mechanism is used for feeding the optical fiber preform into the drawing furnace;
the drawing furnace is positioned at the downstream of the rod feeding mechanism and is used for heating and melting the prefabricated rod into a glass state and forming an optical fiber main body in a target drawing tension range;
the annealing device is positioned at the downstream of the drawing furnace and is used for annealing the optical fiber main body;
the coating device is positioned at the downstream of the annealing device and is used for coating the annealed optical fiber main body;
the curing device is positioned at the downstream of the coating device and is used for curing the coated optical fiber main body to form an optical fiber;
the traction mechanism is positioned at the downstream of the curing device and used for collecting the optical fiber onto a fiber collecting disc.
Optionally, a control device is further included;
the control device includes: the drawing tension acquiring module is used for acquiring the current drawing tension of the annealed optical fiber main body;
and the control module is used for adjusting the wire drawing speed of the traction mechanism in a manner of reducing the difference between the current wire drawing tension and the target wire drawing tension range according to the comparison between the current wire drawing tension and the target wire drawing tension range.
Optionally, the control module is configured to adjust the drawing speed of the traction mechanism in a manner of reducing a difference between the current drawing tension and the target drawing tension range according to a comparison between the current drawing tension and the target drawing tension range, and specifically includes:
if the current drawing tension is greater than the first target drawing tension, reducing the drawing speed of the optical fiber main body;
if the current drawing tension is smaller than the second target drawing tension, the drawing speed of the optical fiber main body is increased;
the first target wire drawing tension is the sum of the target wire drawing tension and 1, and the second target wire drawing tension is the subtraction of the target wire drawing tension and 1; and the target drawing tension is the tension of the optical fiber which meets the requirements of the cut-off wavelength of the optical fiber and the bending loss of the optical fiber at the target drawing speed.
Optionally, the coating device includes the mould, be provided with feed chute and feed inlet on the outer wall of mould, the feed chute includes broken line groove and curve groove, broken line groove with the center intercommunication of curve groove, be provided with on the both ends of curve groove the feed inlet.
Optionally, the curing device comprises 4-8 curing ovens, all of the curing ovens are sequentially placed from top to bottom, and each curing oven is provided with a power adjusting gear.
Optionally, the device further comprises a treatment cabinet for performing heat treatment on the fiber collecting disc filled with the optical fibers in a nitrogen atmosphere.
The invention provides a preparation method of an optical fiber and a device thereof, which ensure that the mode field diameter of the optical fiber meets the mode field diameter of a G.652-class trunk optical fiber by drawing a fused optical fiber preform into a target drawing tension range of an optical fiber main body, and ensure that the bending resistance of the optical fiber meets the bending resistance of the G.657-class optical fiber by reasonably matching the coating parameters of an inner coating layer and an outer coating layer and reasonably matching the coating curing degree, thereby ensuring that the optical fiber simultaneously has the mode field diameter of the G.652-class trunk optical fiber and the bending resistance of the G.657-class optical fiber.
In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions, other technical problems solved by the method for manufacturing an optical fiber and the apparatus thereof according to the embodiments of the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a radial cross-sectional structure of an optical fiber preform according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a cross-sectional refractive index profile of an optical fiber preform according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for fabricating an optical fiber preform according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a radial cross-sectional structure of an optical fiber according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a method for manufacturing an optical fiber according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an apparatus for manufacturing an optical fiber according to an embodiment of the present invention;
fig. 7 is a block diagram of a control device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a die in a coating apparatus according to an embodiment of the present invention.
Reference numerals:
1-optical fiber prefabricated rod; 10-a core rod; 20-a depressed layer; 30-an outer cladding;
40-inner coating layer; 50-an outer coating layer; 2-an optical fiber; 100-a mold;
101-a feed chute; 102-a feed inlet; 1011-fold line groove; 1012-curved slot;
200-a rod feeding mechanism; 201-a wire drawing furnace; 202-an annealing device; 203-a coating device;
204-a curing device; 205-a traction mechanism; 206-a treatment cabinet; 207-control means;
2071-drawing tension obtaining module; 2072-a control module; 208-a tensiometer; 209-upper computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the related art, in order to achieve better bending performance of the optical fiber, it is common to reduce the mode field diameter of the optical fiber or increase the cutoff wavelength of the optical fiber, and there is a limited space for improving the bending performance of the optical fiber by increasing the cutoff wavelength of the optical fiber, considering that the cutoff wavelength must be less than 1260nm after the optical fiber is cabled. However, when the optical fiber that achieves the bending resistance of the g.657 type optical fiber by reducing the mode field diameter is fusion-spliced with the g.652 type trunk optical fiber, a large difference in mode field diameter between the two optical fibers causes a large fusion-splicing loss, and thus there is a problem that the optical signal stability is poor.
In order to solve the problems, the invention provides a method and a device for preparing an optical fiber, which ensure that the mode field diameter of the optical fiber meets the mode field diameter of a G.652-type trunk optical fiber by drawing a molten optical fiber preform into a target drawing tension range of an optical fiber main body, ensure that the bending resistance of the optical fiber meets the bending resistance of the G.657-type optical fiber by reasonably matching coating parameters of an inner coating layer and an outer coating layer and reasonably matching the curing degree of the coating, so that the optical fiber has the mode field diameter of the G.652-type trunk optical fiber and the bending resistance of the G.657-type optical fiber simultaneously, and further avoid the problem of poor optical signal stability caused by a large difference value of the mode field diameters of the optical fiber and the G.657-type optical fiber when the optical fiber and the G.657-type optical fiber are welded.
The following will describe the method and apparatus for manufacturing the optical fiber according to the present invention in detail with reference to specific embodiments.
FIG. 1 is a schematic view of a radial cross-sectional structure of an optical fiber preform according to an embodiment of the present invention; fig. 2 is a schematic cross-sectional refractive index profile of an optical fiber preform according to an embodiment of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides an optical fiber preform 1 including, from the inside to the outside, a core rod 10, a depressed layer 20, and an outer cladding layer 30; the core rod 10 is mainly made of germanium-doped silicon dioxide, and the refractive index of the core rod relative to the outer cladding 30 of the optical fiber prefabricated rod 1 is 0.34-0.38%; the depressed layer 20 of the optical fiber preform 1 is made of silica, and has a refractive index of-0.07% to-0.1% with respect to the outer cladding 30 of the optical fiber preform 1; the outer cladding 30 of the optical fiber preform 1 is made of silica.
In order to make the refractive index of the core rod 10 and the depressed layer 20 of the optical fiber preform 1 have a step-type distribution with respect to the refractive index of the outer cladding 30, the refractive index of the core rod 10 is increased by using germanium-doped silica, and the refractive index of the depressed layer 20 of the optical fiber preform 1 is decreased by using fluorine-doped silica. Through the refractive index profile design of the optical fiber perform 1, the prepared optical fiber 2 has stronger bending resistance and larger mode field diameter.
In an alternative embodiment, the optical fiber preform 1 includes, from the inside to the outside, a core rod 10, a depressed layer 20, and an outer cladding layer 30; the core rod 10 is mainly made of germanium-doped silica, and has a refractive index of 0.38% with respect to the outer cladding 30 of the optical fiber preform 1; the depressed layer 20 of the optical fiber preform 1 is mainly made of germanium-doped silica, and has a refractive index of-0.07% with respect to the outer cladding 30 of the optical fiber preform 1; the outer cladding 30 of the optical fiber preform 1 is made of silica.
The radius of the core rod 10 is r1, the radius of the depressed layer 20 of the optical fiber preform 1 is r2, and the radius of the outer cladding 30 of the optical fiber preform 1 is r3.
Fig. 3 is a schematic flow chart of a method for manufacturing an optical fiber preform according to an embodiment of the present invention.
As shown in fig. 3, an embodiment of the present invention provides a method for preparing an optical fiber preform 1, including the following steps:
and S10, preparing the germanium-doped silicon dioxide powder body by adopting an axial vapor deposition method.
And S20, dehydroxylating and sintering the germanium-doped silicon dioxide powder body to prepare the core rod 10.
Specifically, placing the germanium-doped silicon dioxide powder body in a dehydroxylation atmosphere to remove moisture and hydroxyl, wherein the dehydroxylation atmosphere comprises a carrier gas and a fluorine-containing gas, the carrier gas is chlorine, the volume ratio of the fluorine-containing gas to the chlorine is that, the temperature range of the dehydroxylation atmosphere is the time for placing the germanium-doped silicon dioxide powder body in the dehydroxylation atmosphere.
The refractive index of the core rod 10 with respect to the outer cladding 30 of the optical fiber preform 1 is 0.34% to 0.38% by adding germanium to silica. For example, the core rod 10 is germanium-doped silica having a refractive index of 0.38% with respect to the outer cladding 30 of the optical fiber preform 1.
And S30, preparing the subsidence layer 20 of the optical fiber preform rod 1 on the outer side of the core rod by adopting an axial vapor deposition method.
The control of the refractive index of the depressed layer 20 of the optical fiber preform 1 with respect to the outer cladding 30 is achieved by adding fluorine to silica. Wherein, the depressed layer 20 of the optical fiber perform 1 is mainly made of germanium-doped silica, and the refractive index of the depressed layer is-0.07% -0.1% relative to the outer cladding 30 of the optical fiber perform 1. Preferably, the depressed layer 20 of the optical fiber preform 1 is mainly made of germanium-doped silica having a refractive index of-0.07% with respect to the outer cladding 30 of the optical fiber preform 1.
And S40, preparing the outer cladding layer 30 of the optical fiber preform rod 1 outside the sunken layer 20 by adopting an axial vapor deposition method.
Wherein the outer cladding 30 of the optical fiber preform 1 is mainly made of silica.
In the preparation method of the optical fiber perform 1, the core rod 10, the sunken layer 20 and the outer cladding 30 are all formed in one step by adopting an axial vapor deposition method, so that the core rod 10, the sunken layer 20 and the outer cladding 30 are prevented from being formed separately due to different forming processes, the process complexity of the core rod 10, the sunken layer 20 and the outer cladding 30 is reduced, the internal defects of the optical fiber perform 1 are reduced, and the strength of the optical fiber perform 1 is improved. Moreover, the prepared optical fiber 2 has stronger bending resistance and larger mode field diameter through the refractive index profile design of the optical fiber preform 1.
Fig. 4 is a schematic radial cross-sectional structure diagram of an optical fiber according to an embodiment of the present invention.
As shown in FIG. 4, the embodiment of the present invention further provides an optical fiber 2 including, from the inside to the outside, a core 11, a depressed layer 20, an outer cladding 30, an inner cladding 40, and an outer cladding 50. The core 11 is mainly made of germanium-doped silica, and the refractive index of the core relative to the outer cladding 30 of the optical fiber 2 is 0.34-0.38%; the depressed layer 20 of the optical fiber 2 is mainly made of germanium-doped silica, and has a refractive index of-0.07% to-0.1% with respect to the outer cladding 30 of the optical fiber 2; the outer cladding 30 of the fiber 2 is made of silicon dioxide.
Wherein, the optical fiber 2 is formed by drawing and coating the optical fiber preform 1 by adopting a drawing furnace.
The refractive index of the fiber core 11 and the depressed layer 20 of the optical fiber 2 to the outer cladding 30 is in step-type distribution, so that light is prevented from overflowing from the fiber core 11, and the prepared optical fiber 2 has strong bending resistance and large mode field diameter.
Alternatively, the maximum radius of the core 11 is 4.4 to 4.8 μm, the maximum radius of the depressed layer 20 of the optical fiber 2 is 15 to 23 μm, the maximum radius of the outer cladding 30 of the optical fiber 2 is 62 to 63 μm, the maximum radius of the inner cladding 40 is 72.5 to 77.5 μm, and the maximum radius of the outer cladding 50 is 87.5 to 92.5 μm.
The outer coating 50 of the prior art optical fiber is much larger than the 125 μm radius. The radius of the outer coating layer 50 of the optical fiber 2 is reduced to 87.5-92.5 microns, the refractive indexes of the fiber core 11 and the sunken layer 20 of the optical fiber 2 to the outer coating layer 30 are distributed in a step type, the bending resistance of the optical fiber 2 can be guaranteed to reach the bending resistance of G.657 optical fibers, and the fiber capacity of a pipeline can be improved due to the thinning of the optical fiber 2.
It should be noted that the optical fiber 2 provided by the present application, which has a small size and a good bending resistance, has a transmission loss of less than or equal to 0.45dB per kilometer at a wavelength of 1550nm with a radius of 10mm for a single turn.
Alternatively, the ratio of the thickness of the inner coating layer 40 to the outer coating layer 50 ranges from 1:0.7 to 1:1.1.
wherein, the coating of the inner coating layer 40 and the outer coating layer 50 is acrylic resin, the elastic modulus of the acrylic resin used for the inner coating layer 40 is less than or equal to 1.5Mpa, the viscosity of the acrylic resin used for the inner coating layer 40 is 1500Mpa · s to 3000Mpa · s when coating, and the breaking elongation of the acrylic resin used for the inner coating layer 40 is greater than or equal to 120%; the elastic modulus of the acrylic resin used for the outer coating layer 50 is less than or equal to 550MPa, the viscosity of the acrylic resin used for the outer coating layer 50 is 1500 mPa.s-3500 mPa.s when coating, and the elongation at break of the acrylic resin used for the outer coating layer 50 is greater than or equal to 5%.
The curing degree of the inner coating layer 40 is 85 to 95 percent, and the curing degree of the outer coating layer 50 is 92 to 100 percent
By the thickness ratio of the inner coating layer 40 to the outer coating layer 50 being in the range of 1:0.7 to 1:1.1, the curing degree of the inner coating layer 40 is 85-95%, and the curing degree of the outer coating layer 50 is 92-100%, and when the radius of the outer coating layer 50 of the optical fiber 2 is reduced to below 77.5 μm, the bending resistance of the optical fiber 2 can be improved.
Fig. 5 is a schematic flow chart of a method for manufacturing an optical fiber according to an embodiment of the present invention.
As shown in fig. 5, an embodiment of the present invention provides a method for manufacturing an optical fiber, including the following steps:
step S100, providing an optical fiber preform 1.
Wherein the structure of the optical fiber preform 1 may be the same as that of the above-described optical fiber preform. In other embodiments, the structure of the optical fiber preform may also be selected to be different from that of the above-described optical fiber preform, and is not specifically configured here.
Step S110, the optical fiber preform 1 is melted and drawn in a target drawing tension range to form an optical fiber body.
Specifically, the optical fiber preform 1 is melted and drawn into an optical fiber body in a drawing furnace, the temperature in the drawing furnace is 1800 ℃ to 2200 ℃, and the drawing furnace is filled with protective gas.
In order to ensure the stability of the fiber preform 1 in heat transfer by the drawing furnace, the gap between the fiber preform 1 and the inner wall of the drawing furnace is 5 mm-15 mm.
The optical fiber body includes the core 11, the depressed layer 20, and the outer cladding 30 of the optical fiber 2.
It is also noted that the shielding gas in the drawing furnace is one or more of helium and argon.
The target drawing tension range in which the molten optical fiber preform 1 is drawn into an optical fiber body is a tension range in which the mode field diameter of the optical fiber satisfies the mode field diameter of the g.652-class trunk optical fiber.
And step S120, annealing the optical fiber body.
Specifically, the optical fiber body is cooled in an annealing device, the residence time of the optical fiber body in the annealing device is 0.067 s-0.3 s, and the temperature in the annealing device is 1400-1700 ℃.
It should be noted that the annealing device comprises a plurality of heat preservation furnaces, the heat preservation furnaces are sequentially arranged from top to bottom, and the temperatures of the heat preservation furnaces are sequentially and gradiently decreased from top to bottom.
The annealed optical fiber body is coated to form an inner coating layer 40 and an outer coating layer 50 at step S130.
Wherein, the coating of the inner coating layer 40 and the outer coating layer 50 is acrylic resin, the elastic modulus of the acrylic resin used for the inner coating layer 40 is less than or equal to 1.5Mpa, the viscosity of the acrylic resin used for the inner coating layer 40 is 1500Mpa · s to 3000Mpa · s when coating, and the breaking elongation of the acrylic resin used for the inner coating layer 40 is greater than or equal to 120%; the elastic modulus of the acrylic resin used for the outer coating layer 50 is less than or equal to 550MPa, the viscosity of the acrylic resin used for the outer coating layer 50 is 1500 mPa.s-3500 mPa.s when coating, and the elongation at break of the acrylic resin used for the outer coating layer 50 is greater than or equal to 5%.
The viscosity of the inner coating layer 40 at 25 ℃ is 3500 to 7500mPa · s using an acrylic resin; the outer coating layer 50 has a viscosity of 3500 mPas to 7500 mPas at 25 ℃ using an acrylic resin.
It is also noted that the maximum radius of the inner coating layer 40 is 72.5 μm to 77.5 μm, the maximum radius of the outer coating layer 50 is 87.5 μm to 92..5 μm, and the thickness ratio of the inner coating layer 40 to the outer coating layer 50 is in the range of 1:0.7 to 1:1.1.
And step S140, curing the coated optical fiber body to form the optical fiber 2.
Specifically, the coated optical fiber body is formed into an optical fiber 2 in a curing oven insulated with one or more of nitrogen, helium, and argon, the oxygen concentration in the curing oven being less than 50ppm. The optical fiber 2 has an inner coating layer curing degree of 85% to 95% and an outer coating layer curing degree of 92% to 100%.
Wherein the curing furnaces are arranged from top to bottom in sequence, and the gas quantity of each curing furnace is 10L-15L.
Further, the coated optical fiber main body is cured through a curing oven with preset power and preset quantity to form the optical fiber. The power and number of curing ovens are determined by the fiber draw speed and the coating thickness of the fiber.
And S150, taking the optical fiber 2 to a fiber take-up disc.
Wherein, the optical fiber 2 is drawn to the fiber collecting disc by the cured optical fiber 2 through the traction mechanism.
The mode field diameter of the optical fiber is ensured to meet the mode field diameter of the G.652-class trunk optical fiber by drawing the fused optical fiber preform 1 into a target drawing tension range of the optical fiber main body, and the bending resistance of the optical fiber 2 can meet the bending resistance of the G.657-class optical fiber by reasonably matching the coating parameters of the inner coating layer 40 and the outer coating layer 50 and reasonably matching the coating curing degree, so that the optical fiber 2 has the mode field diameter of the G.652-class trunk optical fiber and the bending resistance of the G.657-class optical fiber at the same time, and the problem of poor optical signal stability caused by a large difference value of the mode field diameters of the optical fiber and the G.657-class optical fiber when the optical fiber and the G.652-class optical fiber are welded can be avoided.
Optionally, the step S130 specifically includes: coating the material of the inner coating layer 40 on the annealed optical fiber main body through a mold; the material of the outer coating layer 50 is coated on the inner coating layer 40 through a die.
The feeding groove and the feeding hole are formed in the outer wall of the mold, the feeding groove comprises a bending groove and a curve groove, the bending groove is communicated with the center of the curve groove, the feeding holes are formed in the two ends of the curve groove, the phenomenon that coatings are unstable and uneven due to the fact that the coatings are directly sprayed to the feeding hole is avoided, and the bending resistance of the optical fibers 2 can be improved.
The radius of the inner coating layer is in the range of 72.5-77.5 μm, the maximum radius of the outer coating layer is in the range of 87.5-92.5 μm, and the ratio of the thickness value of the inner coating layer to the thickness value of the inner coating layer is 1.7-1.
In order that the bending resistance of the optical fiber 2 can reach the bending resistance of the g.657 type optical fiber when the radius of the outer coating layer 50 of the optical fiber 2 is reduced to 87.5 μm to 92.5 μm, the refractive index of the core 11 of the optical fiber 2 with respect to the outer coating layer 30 of the optical fiber 2 is 0.34% to 0.38%, the refractive index of the depressed layer 20 of the optical fiber 2 with respect to the outer coating layer 30 of the optical fiber 2 is-0.07% to-0.1%, and the thickness ratio of the inner coating layer 40 to the outer coating layer 50 is in the range of 1:0.7 to 1:1.1, the curing degree of the inner coating layer 40 is 85-95%, and the curing degree of the outer coating layer 50 is 92-100%.
Optionally, the step of step S140 further includes: the take-up reel filled with the optical fiber 2 is placed in a nitrogen atmosphere to be heat-treated.
The take-up reel filled with the optical fibers 2 is placed in a processing cabinet 206 for heat treatment, and the time for placing the take-up reel filled with the optical fibers 2 in the processing cabinet ranges from 4 hours to 24 hours.
It should be noted that, when the processing cabinet 206 is used, the processing cabinet 206 is vacuumized to 0.015Mpa, and then nitrogen is filled into the processing cabinet 206, wherein the purity of the nitrogen is greater than or equal to 99.999%, the concentration of oxygen in the processing cabinet 206 is not greater than 100ppm, and the temperature range in the processing cabinet 206 is 45-60 ℃.
The fiber collecting disc filled with the optical fibers is placed in a nitrogen atmosphere for heat treatment and then is subjected to optical fiber strength screening, so that the fiber breaking frequency of every 1000km of optical fibers can be reduced.
Fig. 6 is a schematic structural diagram of an optical fiber manufacturing apparatus according to an embodiment of the present invention.
As shown in fig. 6, an embodiment of the present invention further provides an optical fiber manufacturing apparatus, which includes a rod feeding mechanism 200, a drawing furnace 201, an annealing device 202, a coating device 203, a curing device 204, and a drawing mechanism 205.
Wherein the rod feeding mechanism 200 is used to feed the optical fiber preform into the drawing furnace 201. The rod feeding mechanism 200 comprises a rod feeding motor, a driving wheel, a driven wheel, a crawler belt, a rod feeding platform capable of moving up and down and a clamping piece, wherein the clamping piece is used for clamping the optical fiber perform rod; the caterpillar band is installed on a driving wheel and a driven wheel, the rod feeding motor is connected with the driving wheel, the rod feeding platform is installed on the caterpillar band, the clamping piece is installed on the rod feeding platform, the rod feeding mechanism is installed on the driving wheel and the driven wheel, the rod feeding motor is connected with the driving wheel, the rod feeding platform is installed on the caterpillar band, the moving piece can be installed on the rod feeding platform in a left-right moving mode, and the clamping piece can be installed on the moving piece in a front-back moving mode.
The drawing furnace 201 is located downstream of the rod feeding mechanism 200, and is used for heating and melting the optical fiber preform into a glass state and drawing the optical fiber preform into a filamentous optical fiber body.
The temperature in the wire drawing furnace 201 is 1800-2200 ℃, and the wire drawing furnace 201 is filled with protective gas. The protective gas in the drawing furnace is one or more of helium and argon.
In order to ensure the stability of the fiber preform heat transfer by the drawing furnace 201, the gap between the fiber preform and the inner wall of the drawing furnace 201 is 5mm to 15mm.
The optical fiber body includes the core 11, the depressed layer 20, and the outer cladding 30 of the optical fiber 2.
An annealing device 202 is located downstream of the drawing furnace 201 for annealing the optical fiber body.
The residence time of the optical fiber main body in the annealing device 202 is 0.067 s-0.3 s, and the temperature in the annealing device 202 is 1400-1700 ℃.
It should be noted that the annealing device 202 includes a plurality of holding furnaces, the plurality of holding furnaces are sequentially arranged from top to bottom, and the plurality of holding furnaces are sequentially arranged in a gradient manner from top to bottom.
A coating device 203 is located downstream of the annealing device 202 for coating the annealed fiber body.
A curing device 204 is located downstream of the coating device 203 for curing the coated optical fiber body to form the optical fiber 2.
A drawing mechanism 205 is located downstream of the consolidation device 204 for providing a drawing speed and taking up the optical fiber 2 onto a take-up reel.
Optionally, the apparatus for preparing optical fibers further comprises a treatment cabinet 206 for heat treating the take-up reel filled with optical fibers.
When the processing cabinet 206 is used, the vacuum pumping treatment is firstly carried out, the processing cabinet 206 is vacuumized to 0.015Mpa, then nitrogen is filled into the processing cabinet, the purity of the nitrogen is more than or equal to 99.999 percent, the concentration of oxygen in the processing cabinet is not more than 100ppm, and the temperature range in the processing cabinet is 45-60 ℃.
The fiber collecting disc filled with the optical fibers is placed in a nitrogen atmosphere for heat treatment and then is subjected to optical fiber strength screening, so that the fiber breaking frequency of each 1000km of optical fibers can be reduced.
Fig. 7 is a block diagram of a control device according to an embodiment of the present invention.
Optionally, as shown in fig. 7, the apparatus for preparing an optical fiber according to an embodiment of the present invention further includes a control device 207 and a tension meter 208.
The control device 207 includes: a drawing tension obtaining module 2071, configured to obtain a current drawing tension of the annealed optical fiber body. And a control module 2072, configured to adjust the drawing speed of the traction mechanism 205 to adjust the current drawing tension not within the target drawing tension range to be within the target drawing tension range.
A tension meter 208 is disposed between the annealing device 202 and the coating device 203. The tension meter 208 is connected to the control device 207 through a signal line. The tension meter 208 is configured to detect a current drawing tension of the annealed optical fiber body, and transmit a signal of the detected current drawing tension of the optical fiber body to the control device 207.
The upper computer 209 is connected with the control device 207 through a control line.
The current drawing tension of the optical fiber body can be calculated by the following formula:
F＝2η T SG Z
in the formula, F is the current drawing tension of the optical fiber main body; eta T Viscosity, as a function of temperature; s is the cross-sectional area of the optical fiber main body; g z Is the axial velocity gradient.
It can be seen that the magnitude of the current draw tension of the optical fiber body is primarily related to the viscosity and axial velocity gradient, which are controlled by the furnace temperature and draw speed. The uniformity of the cross-section of the fiber body also has some effect on the magnitude of the current draw tension of the fiber body. The influence of the drawing speed of the traction mechanism 205 on the current drawing tension is embodied as follows: the drawing speed of the traction mechanism 205 is increased, the viscosity is increased, and the current drawing tension is increased; the drawing speed of the drawing mechanism 205 decreases, the viscosity decreases, and the current drawing tension decreases.
Acquiring the current drawing tension of the annealed optical fiber main body through a tension meter 208; the control device 207 compares and analyzes the obtained current drawing tension with a target drawing tension range set by the upper computer 209, and then adjusts the drawing speed of the traction mechanism 205 to adjust the current drawing tension to the target drawing tension range.
In an alternative embodiment, the lower limit of the target drawing tension range is a first target drawing tension and the upper limit of the target drawing tension range is a second target drawing tension.
And if the current wire drawing tension is greater than the first target wire drawing tension, reducing the wire drawing speed of the traction mechanism.
Specifically, the drawing speed of the traction mechanism 205 is first reduced by the control device 207 according to the change of not less than 1m/min per second, then the current drawing tension of the optical fiber body is detected by the tension meter 208, the detected current drawing tension signal of the optical fiber body is transmitted to the control device 207, finally the control device 207 compares and analyzes the obtained current drawing tension with a first target drawing tension set by an upper computer, if the current drawing tension of the optical fiber body is less than or equal to the first target drawing tension, the adjustment of the drawing speed of the traction mechanism 205 is stopped, and if the current drawing tension of the optical fiber body is still greater than the first target drawing tension, the drawing speed of the traction mechanism 205 is continuously adjusted in the above manner.
And if the current wire drawing tension is smaller than the second target wire drawing tension, improving the wire drawing speed of the traction mechanism.
Specifically, the drawing speed of the traction mechanism 205 is increased by the control device 207 according to the change per second of not less than 1m/min, then the current drawing tension of the optical fiber body is detected by the tension meter 208, the detected current drawing tension signal of the optical fiber body is transmitted to the control device 207, finally the control device 207 compares and analyzes the obtained current drawing tension with a second target drawing tension set by an upper computer, if the current drawing tension of the optical fiber body is greater than or equal to the second target drawing tension, the adjustment of the drawing speed of the traction mechanism 205 is stopped, and if the current drawing tension of the optical fiber body is still less than the second target drawing tension, the drawing speed of the traction mechanism 205 is continuously adjusted in the above manner.
The first target wire drawing tension is the target wire drawing tension plus 1, and the second target wire drawing tension is the target wire drawing tension minus 1; the target drawing tension is the tension after the fiber cutoff wavelength and the fiber bending loss of the optical fiber at the target drawing speed are satisfied.
Optionally, the curing device 204 includes 4 to 8 curing ovens, all the curing ovens are placed in sequence from top to bottom, and each curing oven is provided with a power adjusting gear.
The control device 207 further includes an optical fiber drawing speed obtaining module and an optical fiber coating thickness obtaining module, the optical fiber drawing speed obtaining module is used for obtaining the optical fiber drawing speed, and the optical fiber coating thickness obtaining module is used for obtaining the thickness of the optical fiber coating. The control module 2072 is further configured to control the number and power of the curing ovens according to the fiber drawing speed and the thickness of the fiber coating layer, so as to achieve the set curing degree of the optical fiber.
It should be noted that the control module 2072 is provided with the number and power of the curing ovens corresponding to the optical fiber drawing speed and the thickness of the optical fiber coating layer at the preset curing degree.
Fig. 8 is a schematic structural diagram of a die in a coating apparatus according to an embodiment of the present invention.
Optionally, the coating device 203 comprises a die 100, a feed chute 101 and a feed inlet 102 are arranged on the outer wall of the die, the feed chute 101 comprises a polygonal line groove 1011 and a curved groove 1012, the polygonal line groove 1011 is communicated with the center of the curved groove 1012, and the feed inlet 102 is arranged on both ends of the curved groove 1012. When the dope is injected into the mold 100, the instability and unevenness of the coating of the optical fiber 2 caused by the direct injection of the dope to the feed opening can be prevented, and the bending resistance of the optical fiber 2 can be improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A method of making an optical fiber, comprising the steps of:
providing an optical fiber preform; the method specifically comprises the following steps:
preparing a germanium-doped silicon dioxide powder body by adopting an axial vapor deposition method;
carrying out dehydroxylation sintering on the germanium-doped silicon dioxide powder body to prepare a core rod;
preparing a sunken layer on the outer side of the core rod by adopting an axial vapor deposition method;
preparing an outer cladding layer on the outer side of the sunken layer of the optical fiber preform by adopting an axial vapor deposition method;
wherein the relative refractive index of the core rod relative to the outer cladding is 0.34-0.38%; the relative refractive index of the depressed layer relative to the outer cladding layer is-0.07% -0.1%;
melting and drawing the optical fiber preform in a target drawing tension range to form an optical fiber main body;
annealing the optical fiber main body;
coating the annealed optical fiber main body to form an inner coating layer and an outer coating layer;
curing the coated optical fiber main body to form an optical fiber;
collecting the optical fiber on a fiber collecting disc;
wherein the coating materials of the inner coating layer and the outer coating layer are acrylic resin, the elastic modulus of the acrylic resin used for the inner coating layer is less than or equal to 1.5MPa, the viscosity is 1500-3000 mPa-s when coating, and the elongation at break is more than or equal to 120%; the elastic modulus of the acrylic resin used for the outer coating layer is more than or equal to 550Mpa, the viscosity during coating is 1500-3500 mPa.s, and the elongation at break is more than or equal to 5%; the curing degree of the inner coating layer is 85% -95%, and the curing degree of the outer coating layer is 92% -100%.
2. The method according to claim 1, wherein a current drawing tension of the annealed optical fiber body is obtained, and the current drawing tension is adjusted to be within the target drawing tension range by adjusting a drawing speed of the optical fiber body according to a comparison between the current drawing tension and the target drawing tension range.
3. The method of manufacturing an optical fiber according to claim 2, wherein if the current drawing tension is greater than a first target drawing tension, the drawing speed of the optical fiber body is decreased;
if the current drawing tension is smaller than the second target drawing tension, the drawing speed of the optical fiber main body is increased;
the first target wire drawing tension is the target wire drawing tension plus 1, and the second target wire drawing tension is the target wire drawing tension minus 1; and the target drawing tension is the tension of the optical fiber which meets the requirements of the cut-off wavelength of the optical fiber and the bending loss of the optical fiber at the target drawing speed.
4. The method for preparing an optical fiber according to claim 1, wherein the coating of the annealed optical fiber body to form an inner coating layer and an outer coating layer comprises:
coating the material of the inner coating layer on the annealed optical fiber main body through a mold;
coating the material of the outer coating layer on the inner coating layer through the mold;
wherein the outer wall of the die is provided with a feed chute and a feed inlet, the feed chute comprises a bending chute and a curved chute, the bent line groove is communicated with the center of the curved line groove, and the two ends of the curved line groove are provided with the feed inlets; the radius of the inner coating layer ranges from 72.5 to 77.5 μm, the maximum radius of the outer coating layer ranges from 87.5 μm to 92.5 μm, and the ratio of the thickness value of the inner coating layer to the thickness value of the inner coating layer is 1.7-1.
5. The method according to claim 1, wherein the curing the coated optical fiber body to form an optical fiber comprises:
and curing the coated optical fiber main body through a curing furnace with preset power and preset quantity to form the optical fiber.
6. The method for producing an optical fiber according to claim 1, wherein the take-up reel filled with the optical fiber is placed in a nitrogen atmosphere to be subjected to heat treatment;
wherein the purity of the nitrogen in the nitrogen atmosphere is greater than or equal to 99.999 percent, and the time for carrying out heat treatment on the optical fiber on the fiber collecting disc in the nitrogen atmosphere is 4-24 hours.
7. An optical fiber manufacturing apparatus for manufacturing the optical fiber according to any one of claims 1 to 6, comprising a rod feeding mechanism, a drawing furnace, an annealing device, a coating device, a curing device, and a drawing mechanism;
the rod feeding mechanism is used for feeding the optical fiber preform rod into the wire drawing furnace;
the drawing furnace is positioned at the downstream of the rod feeding mechanism and is used for heating and melting the prefabricated rod into a glass state and forming an optical fiber main body in a target drawing tension range;
the annealing device is positioned at the downstream of the drawing furnace and is used for annealing the optical fiber main body;
the coating device is positioned at the downstream of the annealing device and is used for coating the annealed optical fiber main body;
the curing device is positioned at the downstream of the coating device and is used for curing the coated optical fiber main body to form an optical fiber;
the traction mechanism is positioned at the downstream of the curing device and is used for collecting the optical fiber onto a fiber collecting disc.
8. The apparatus for preparing an optical fiber according to claim 7, further comprising a control device;
the control device includes: the drawing tension acquiring module is used for acquiring the current drawing tension of the annealed optical fiber main body;
and the control module is used for adjusting the wire drawing speed of the traction mechanism in a manner of reducing the difference between the current wire drawing tension and the target wire drawing tension range according to the comparison between the current wire drawing tension and the target wire drawing tension range.
9. The apparatus according to claim 8, wherein the control module is configured to adjust the drawing speed of the pulling mechanism in a manner that the difference between the current drawing tension and the target drawing tension range is reduced according to the comparison between the current drawing tension and the target drawing tension range, and specifically comprises:
if the current drawing tension is greater than the first target drawing tension, reducing the drawing speed of the optical fiber main body;
if the current drawing tension is smaller than the second target drawing tension, the drawing speed of the optical fiber main body is increased;
the first target wire drawing tension is the target wire drawing tension plus 1, and the second target wire drawing tension is the target wire drawing tension minus 1; the target drawing tension is the tension of the optical fiber after the cut-off wavelength and the bending loss of the optical fiber meet the target drawing speed.
10. The apparatus for manufacturing an optical fiber according to claim 7, wherein the coating apparatus comprises a mold, and a feed chute and a feed inlet are provided on an outer wall of the mold, the feed chute comprising a bending chute and a curved chute, the bending chute communicating with a center of the curved chute, the feed inlet being provided on both ends of the curved chute.
11. The apparatus according to claim 7, wherein the curing apparatus comprises 4-8 curing ovens, all of the curing ovens are arranged in sequence from top to bottom, and each curing oven is provided with a power adjusting gear.
12. The apparatus for manufacturing an optical fiber according to claim 7, further comprising a processing cabinet for performing a heat treatment in a nitrogen atmosphere on the take-up reel filled with the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020397.7A CN113582534B (en) | 2021-09-01 | 2021-09-01 | Method and apparatus for manufacturing optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020397.7A CN113582534B (en) | 2021-09-01 | 2021-09-01 | Method and apparatus for manufacturing optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113582534A CN113582534A (en) | 2021-11-02 |
| CN113582534B true CN113582534B (en) | 2023-01-03 |
Family
ID=78240888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111020397.7A Active CN113582534B (en) | 2021-09-01 | 2021-09-01 | Method and apparatus for manufacturing optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113582534B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114276026B (en) * | 2021-11-25 | 2024-03-22 | 中天科技光纤有限公司 | Optical fiber preparation method and equipment |
| CN115490419B (en) * | 2022-09-30 | 2023-10-17 | 中天科技光纤有限公司 | Optical fiber and method for producing the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5386148B2 (en) * | 2008-11-05 | 2014-01-15 | 株式会社フジクラ | Manufacturing method and manufacturing apparatus for optical fiber |
| CN103214181B (en) * | 2013-04-18 | 2015-09-16 | 烽火通信科技股份有限公司 | A kind of device and method of making optical fiber by high speed drawing |
| JP5851636B1 (en) * | 2015-02-10 | 2016-02-03 | 株式会社フジクラ | Manufacturing method, control device, and manufacturing apparatus for optical fiber |
| CN106116138A (en) * | 2016-05-18 | 2016-11-16 | 中天科技光纤有限公司 | A kind of wire drawing coating processes of minor diameter low-loss bend-insensitive single-mode optical fiber |
| CN112897874B (en) * | 2021-05-07 | 2021-11-16 | 中天科技光纤有限公司 | Control method and control device for optical fiber drawing speed and optical fiber drawing system |
-
2021
- 2021-09-01 CN CN202111020397.7A patent/CN113582534B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113582534A (en) | 2021-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113582534B (en) | Method and apparatus for manufacturing optical fiber | |
| JP6052897B2 (en) | Multi-core optical fiber ribbon and manufacturing method thereof | |
| CN107710041B (en) | Low attenuation optical fiber with stress relief layer, preform therefor and method of making same | |
| US20120033924A1 (en) | Low loss optical fiber designs and methods for their manufacture | |
| EP3978969A1 (en) | Optical fiber, and preparation method for optical fiber | |
| EP1878708B1 (en) | Method for manufacturing an optical preform by means of an internal vapour deposition process, as well as a preform obtained thereby | |
| JP4663277B2 (en) | Optical fiber and manufacturing method thereof | |
| US9588286B2 (en) | Optical fiber | |
| US20120057834A1 (en) | Optical Fiber, Optical Fiber Preform and Method of Fabricating Same | |
| CN111801609B (en) | Optical fiber | |
| JP5949016B2 (en) | Optical fiber manufacturing method | |
| EP4091995A1 (en) | Optical fiber and preparation method therefor | |
| GB2314077A (en) | Making optical fibres by drawing rod-in-tube preforms | |
| CN113716862B (en) | Method and apparatus for manufacturing optical fiber | |
| US8971684B2 (en) | Method of producing preform for coupled multi-core fiber, method of producing coupled multi-core fiber, and coupled multi-core fiber | |
| US6823125B2 (en) | Optical fiber base material, its manufacturing method and optical fiber | |
| WO2020119244A1 (en) | Optical fiber and preparation method therefor | |
| US8567217B2 (en) | Optical fiber preform and manufacturing method therefor | |
| US20020197005A1 (en) | Method and apparatus for fabricating optical fiber using adjustment of oxygen stoichiometry | |
| CN115636581B (en) | Optical fiber preform, optical fiber drawing device, and optical fiber drawing method | |
| US20150040616A1 (en) | Optical fiber glass base material manufacturing method and optical fiber glass base material | |
| CN115490419B (en) | Optical fiber and method for producing the same | |
| US20230016133A1 (en) | Optical fiber | |
| CN117534345A (en) | Optical fiber preparation method, system and optical fiber | |
| CN116589174A (en) | Quartz prefabricated part, optical fiber and optical fiber preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |