WO2020248553A1 - 用于制造超低衰减光纤的光纤预制棒、方法及光纤 - Google Patents

用于制造超低衰减光纤的光纤预制棒、方法及光纤 Download PDF

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WO2020248553A1
WO2020248553A1 PCT/CN2019/124974 CN2019124974W WO2020248553A1 WO 2020248553 A1 WO2020248553 A1 WO 2020248553A1 CN 2019124974 W CN2019124974 W CN 2019124974W WO 2020248553 A1 WO2020248553 A1 WO 2020248553A1
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Prior art keywords
optical fiber
closed ring
tail
tail pipe
ultra
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PCT/CN2019/124974
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English (en)
French (fr)
Chinese (zh)
Inventor
罗文勇
喻煌
戚卫
余志强
伍淑坚
柯一礼
杜城
朱侨
曾凡球
Original Assignee
烽火通信科技股份有限公司
锐光信通科技有限公司
烽火藤仓光纤科技有限公司
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Priority to MX2021006383A priority Critical patent/MX2021006383A/es
Priority to BR112021008406-1A priority patent/BR112021008406A2/pt
Priority to RU2021111844A priority patent/RU2768315C1/ru
Publication of WO2020248553A1 publication Critical patent/WO2020248553A1/zh

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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]
    • 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
    • C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
    • C03B37/023—Fibres composed of different sorts of glass, e.g. glass optical fibres, made by the double crucible technique
    • 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
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/0253—Controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/028—Drawing fibre bundles, e.g. for making fibre bundles of multifibres, image fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/23—Double or multiple optical cladding profiles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/40—Multifibres or fibre bundles, e.g. for making image fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/08—Sub-atmospheric pressure applied, e.g. vacuum
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/42—Drawing at high speed, i.e. > 10 m/s

Definitions

  • the invention relates to the technical field of optical fiber preforms, in particular to an optical fiber preform used for manufacturing ultra-low attenuation optical fibers, a method and an optical fiber.
  • Optical communication technology is the physical basic layer of information communication, providing support for the entire mobile Internet, big data and other application layers. It is an indispensable basic field for the development of my country's 13th Five-Year Plan. It is under this background that the nerve of optical communication-the high-end manufacturing technology and industrialization of optical fiber is particularly important. With the development of high-speed communication technology, 100G technology has matured, 400G technology is rapidly commercialized, and traditional single-mode optical fiber media are increasingly unable to meet the requirements of high-speed communication.
  • Ultra-low attenuation optical fiber technology is the core basic material for large-capacity transmission and long-distance transmission systems.
  • the core of the development of ultra-low attenuation fiber is to reduce the scattering loss in the fiber. Therefore, the ultra-low attenuation fiber is usually designed with a pure silica core.
  • the cladding material In order to form a fully reflective waveguide structure, when the core is a pure silicon core, the cladding material It cannot be a traditional pure silicon core material, so it is necessary to deposit a low refractive index material around the pure silica core, which is usually doped with fluorine to form the cladding.
  • the quartz cladding is doped with fluorine in quartz glass to refract
  • the rate is reduced, so compared with the core area of a pure silicon core, it can constitute a total reflection condition.
  • quartz glass is doped with fluorine, its viscosity will decrease, and the viscosity of the core and cladding is different at high temperatures.
  • the manufacturing process of optical fibers is to first manufacture light rods and then melt and draw them into optical fibers at high temperature. In the process of manufacturing the light rod, both the core material and the cladding material go through a process of higher temperature melting and low temperature solidification.
  • the technology of reducing the core-package interface stress is a core technology.
  • the core area is doped with potassium to reduce the viscosity, and at the same time, materials that do not bring too much additional absorption loss in the communication band, so as to achieve the viscosity matching of the core and cladding.
  • this method there are still problems such as the viscosity imbalance caused by the diffusion of the potassium-doped interface and the fluorine-doped interface, and the stress interference between the fluorine-doped interface and the external pure silica interface, which causes the attenuation of the optical fiber to still not reach the ideal value.
  • the purpose of the present invention is to provide an optical fiber preform, method and optical fiber for manufacturing ultra-low attenuation optical fiber, which can solve the attenuation caused by the high interface stress faced by the ultra-low attenuation optical fiber, and achieve ultra-low attenuation fiber. Manufacturing of low-attenuation fiber.
  • an optical fiber preform for manufacturing ultra-low attenuation optical fiber which includes a core rod and a sleeve sleeved outside the core rod;
  • the core rod includes a potassium-doped core layer and a potassium-fluorine co-doped core layer arranged sequentially from the inside to the outside;
  • the sleeve includes an inner sleeve and an outer sleeve arranged in sequence from the inside to the outside, and the inner sleeve includes a deep fluorine doped layer and a shallow fluorine doped layer arranged in sequence from the inside to the outside;
  • the gap between the core rod and the inner sleeve forms a first space.
  • the optical fiber preform further includes a tail tube, and the tail tube includes:
  • a tail rod one end of which is connected to the core rod and the other end to the closed ring;
  • the inner tail pipe is sleeved outside the tail rod, one end of the inner tail pipe is connected to the sleeve, and the other end is connected to the closed ring; at the same time,
  • the gap between the closed ring, the tail rod, and the inner tail pipe and the first space together form a first section, and the closed ring is provided with an inner suction hole communicating with the first section.
  • the gap between the inner sleeve and the outer sleeve forms a second space.
  • the optical fiber preform further includes a tail tube, and the tail tube includes:
  • a tail rod one end of which is connected to the core rod and the other end to the closed ring;
  • the outer tail pipe is sleeved outside the inner tail pipe, one end of the outer tail pipe is connected to the outer sleeve, and the other end is connected to the closed ring; at the same time,
  • the gap between the closed ring, the tail rod, and the inner tail pipe and the first space jointly form a first section, and the closed ring is provided with an inner suction hole communicating with the first section;
  • the present invention also provides a method for manufacturing an ultra-low attenuation optical fiber using the optical fiber preform as described above, which includes the following steps:
  • the vacuum degree in the first space is adjusted to a first preset vacuum degree, and the optical fiber is drawn.
  • the optical fiber preform further includes a tail tube, and the tail tube includes:
  • a tail rod one end of which is connected to the core rod and the other end to the closed ring;
  • the inner tail pipe is sleeved outside the tail rod, one end of the inner tail pipe is connected to the sleeve, and the other end is connected to the closed ring; at the same time,
  • the gap between the closed ring, the tail rod, and the inner tail pipe and the first space jointly form a first section, and the closed ring is provided with an inner suction hole communicating with the first section;
  • the method further includes: pumping air outward through the inner air extraction hole to adjust the vacuum degree in the first space to the first preset vacuum degree.
  • the present invention also provides a method for manufacturing an ultra-low attenuation optical fiber using the optical fiber preform as described above, which includes the following steps:
  • the optical fiber preform further includes a tail tube, and the tail tube includes:
  • a tail rod one end of which is connected to the core rod and the other end to the closed ring;
  • the outer tail pipe is sleeved outside the inner tail pipe, one end of the outer tail pipe is connected to the outer sleeve, and the other end is connected to the closed ring; at the same time,
  • the gap between the closed ring, the tail rod, and the inner tail pipe and the first space jointly form a first section, and the closed ring is provided with an inner suction hole communicating with the first section;
  • the method further includes: pumping air outward through the inner air extraction hole to adjust the vacuum degree in the first space to the first preset vacuum degree, and pumping air outward through the outer air extraction hole to adjust the vacuum.
  • the vacuum degree in the second space reaches a second preset vacuum degree.
  • drawing tower includes:
  • a preheating heating element for preheating the optical fiber preform, and the preheating heating element has a preheating area for accommodating the optical fiber preform
  • the fusion heating element is used to fuse the preheated optical fiber preform into a solid rod and form an ultra-low attenuation optical fiber, and the fusion heating element has a heat sink for accommodating the preheated optical fiber preform A melting zone, the melting zone is located below the preheating zone;
  • the heat preservation heating element is used to cool the ultra-low attenuation optical fiber at a first preset temperature to remove melting stress.
  • the heat preservation heating element has a heat preservation area for accommodating the ultra-low attenuation optical fiber.
  • the heat preservation zone is located below the melting zone;
  • the annealing furnace is used to anneal the ultra-low attenuation optical fiber from which the melting stress has been removed at a second preset temperature to remove interfacial stress, and the annealing furnace has an annealing furnace for accommodating the ultra-low attenuation optical fiber Zone, the annealing zone is located below the heat preservation zone;
  • a temperature detector is used to detect the temperature at which the ultra-low attenuation optical fiber after the melting stress has been removed enters and leaves the annealing furnace.
  • the present invention also provides an ultra-low attenuation optical fiber manufactured by using the optical fiber preform as described above, which includes a core layer and a cladding layer sheathed outside the core layer;
  • the core layer includes a potassium-doped core region and a potassium-fluorine co-doped core region arranged sequentially from the inside to the outside;
  • the cladding layer includes a deep fluorine-doped area, a shallow fluorine-doped area and a quartz area arranged in order from the inside to the outside;
  • the attenuation of the ultra-low attenuation optical fiber is less than 0.150 dB/km.
  • the present invention is based on the principle of viscosity matching to reduce the interfacial stress, and proposes the concept of combining a multi-layer core rod and a multi-layer sleeve.
  • a potassium-fluorine co-doped core layer is arranged outside the potassium-doped core layer, and the inner sleeve is gradually transitioned.
  • the inner layer of the tube is matched with a deep fluorine-doped layer to reduce the imbalance of the interface viscosity caused by the diffusion of the easily diffused fluorine ions to the core layer.
  • the outer layer of the inner sleeve gradually reduces the amount of fluorine doped to form
  • the shallow fluorine-doped layer reduces the stress between the inner casing and the outer casing.
  • the end of the optical fiber preform of the present invention is equipped with a combined tail tube, so that the core rod and the inner sleeve, the inner sleeve and the outer sleeve can achieve good solid melting during the optical fiber drawing, and the first space during the optical fiber drawing
  • the second space and the second space are separately evacuated to control the degree of vacuum, so as to achieve good solid melting of the core rod and the sleeve, the inner sleeve and the outer sleeve when the optical fiber is drawn.
  • Fig. 1 is a schematic diagram of an end face structure of an optical fiber preform provided by an embodiment of the present invention
  • Figure 2 is a schematic diagram of drawing the optical fiber preform in Figure 1;
  • FIG. 3 is a schematic diagram of the end face structure of an optical fiber preform provided by another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of drawing the optical fiber preform in FIG. 3;
  • Fig. 5 is a schematic diagram of an end face structure of an ultra-low attenuation optical fiber provided by an embodiment of the present invention.
  • Deep fluorine doped area 51 , Shallow doped fluorine zone; 52, quartz zone; 6, drawing tower; 60, preheating heating element; 600, preheating zone; 61, melting heating element; 610, melting zone; 62, thermal insulation heating element; 620, thermal insulation zone ; 63. Annealing furnace; 630. Annealing zone; 64. Upper temperature detector; 65. Lower temperature detector; 7. Ultra-low attenuation fiber.
  • optical fiber can be divided into manufacturing technology of optical fiber preform and drawing technology of drawing optical fiber preform into optical fiber.
  • Common optical fiber preform manufacturing technologies include PCVD (Plasma activated Chemical Vapor Deposition), MCVD (Modified Chemical Vapor Deposition), and VAD (Vapour phase Axial Deposition). Vapor deposition method), OVD (Outside Chemical Vapor Deposition, external chemical vapor deposition method) and other process methods.
  • the above method usually requires the manufacture of the optical fiber core rod first, and then the manufacture of the fiber optic ferrule, and then the core rod and the ferrule are combined to form a finished fiber preform, and finally the fiber optic preform is placed on the drawing tower and drawn Make an optical fiber.
  • the invention adopts the PCVD or MCVD process to prepare the core rod, the PCVD process to prepare the inner sleeve, and the OVD process or other processes to prepare the outer sleeve.
  • the first embodiment of the present invention provides an optical fiber preform for manufacturing ultra-low attenuation optical fibers.
  • the optical fiber preform includes a core rod 1 and a sleeve 2 sheathed outside the core rod 1;
  • the rod 1 includes a potassium-doped core layer 10 and a potassium-fluorine co-doped core layer 11 arranged in sequence from the inside to the outside;
  • the sleeve 2 includes an inner sleeve 20 and an outer sleeve 21 arranged in sequence from the inside to the outside, and the outer sleeve 21 is made of pure quartz
  • the inner sleeve 20 includes a deep fluorine-doped layer 200 and a shallow fluorine-doped layer 201 arranged in sequence from the inside to the outside; the gap between the core rod 1 and the inner sleeve 20 forms a first space A.
  • the present invention is based on the principle of viscosity matching to reduce the interfacial stress, and proposes the concept of combining a multi-layer core rod and a multi-layer sleeve.
  • a potassium-fluorine co-doped core layer 11 is arranged outside the potassium-doped core layer 10, and through a gradual transition,
  • the inner layer of the inner sleeve 20 is matched with a deep fluorine-doped layer 200 to reduce the imbalance of the interface viscosity caused by the diffusion of the easily diffused fluoride ions to the core layer.
  • the outer layer of the inner sleeve 20 will be doped with fluorine. The amount is gradually reduced to form a shallow fluorine-doped layer 201, thereby reducing the stress between the inner sleeve 20 and the outer sleeve 21.
  • the core rod 1 and the sleeve 2 can be directly placed on the drawing tower for wire drawing, and the core rod 1 and the sleeve 2 can be uniformly fused by adjusting the vacuum degree of the first space A.
  • the core rod 1 and the sleeve 2 are preheated by the preheating heating element in the drawing tower, and then melted by the melting heating element, and then slowly annealed by the heat preservation heating element, and then under cold air conditions outside the high temperature furnace, Normal annealing is carried out in the annealing furnace to fully eliminate the closing stress between the mandrel 1 and the sleeve 2.
  • the optical fiber preform also includes a tail tube 3.
  • the tail tube 3 includes a closed ring 30, a tail rod 31, and an inner tail tube 32; one end of the tail rod 31 is connected to the mandrel 1, and the other end is connected to the closed ring 30; the inner tail tube 32 It is sleeved outside the tail rod 31, one end of the inner tail tube 32 is connected to the sleeve 2, and the other end is connected to the closed ring 30; at the same time, the gap between the closed ring 30, the tail rod 31 and the inner tail tube 32 and the first space A together form a first In section C, the closed ring 30 is provided with an inner suction hole 34 communicating with the first section C.
  • the end of the optical fiber preform of the present invention is equipped with a combined tail tube 3, so that the core rod 1 and the sleeve 2 can achieve good solid melting during the fiber drawing, the first space A (or the first In section C), air is pumped to control the degree of vacuum, so as to achieve good solid melting of the core rod 1 and the sleeve 2 when the optical fiber is drawn.
  • the second embodiment of the present invention provides a method for manufacturing an ultra-low attenuation optical fiber using an optical fiber preform, which includes the following steps:
  • the third embodiment of the present invention provides an optical fiber preform for manufacturing ultra-low attenuation optical fiber.
  • the optical fiber preform includes a core rod 1 and a sleeve 2 sheathed outside the core rod 1;
  • the rod 1 includes a potassium-doped core layer 10 and a potassium-fluorine co-doped core layer 11 arranged in sequence from the inside to the outside;
  • the sleeve 2 includes an inner sleeve 20 and an outer sleeve 21 arranged in sequence from the inside to the outside, and the inner sleeve 20 includes
  • the deep fluorine-doped layer 200 and the shallow fluorine-doped layer 201 are arranged in sequence from the inside to the outside;
  • the gap between the core rod 1 and the inner sleeve 20 forms the first space A, and the gap between the inner sleeve 20 and the outer sleeve 21 forms the second Two space B.
  • the present invention can directly place the mandrel 1 and the sleeve 2 on the drawing tower for wire drawing, adjust the vacuum degree of the first space A to make the mandrel 1 and the inner sleeve 20 uniformly fuse, and adjust the vacuum degree of the second space B
  • the inner sleeve 20 and the outer sleeve 21 are evenly fused.
  • the core rod 1 and the sleeve 2 are preheated by the preheating heating element in the drawing tower, and then melted by the melting heating element, and then slowly annealed by the heat preservation heating element, and then under cold air conditions outside the high temperature furnace, Normal annealing is carried out in the annealing furnace, thereby fully eliminating the closing stress between the core rod 1 and the inner sleeve 20, and the inner sleeve 20 and the outer sleeve 21.
  • the optical fiber preform also includes a tail tube 3.
  • the tail tube 3 includes a closed ring 30, a tail rod 31, an inner tail tube 32, and an outer tail tube 33; one end of the tail rod 31 is connected to the core rod 1, and the other end is connected to the closed ring 30; the inner tail pipe 32 is sleeved outside the tail rod 31, one end of the inner tail pipe 32 is connected to the inner sleeve 20, and the other end is connected to the closed ring 30; the outer tail pipe 33 is sleeved outside the inner tail pipe 32, and one end of the outer tail pipe 33 is connected to the outer sleeve 21.
  • the other end is connected to the closed ring 30; at the same time, the gap between the closed ring 30, the tail rod 31, and the inner tail pipe 32 and the first space A together form a first section C, and the closed ring 30 is provided with the first section C connected
  • the end of the optical fiber preform of the present invention is provided with a combined tail tube 3, so that the core rod 1 and the inner sleeve 20, the inner sleeve 20 and the outer sleeve 21 can achieve good solid melting during the fiber drawing, and the fiber is drawn In the first space A (or the first interval C) and the second space B (or the second interval D) respectively for vacuum control, so as to realize the core rod 1 and the sleeve 2 during the fiber drawing. Good solid melting of sleeve 20 and outer sleeve 21.
  • the fourth embodiment of the present invention provides a method for manufacturing an ultra-low attenuation optical fiber using an optical fiber preform, which includes the following steps:
  • the fifth embodiment of the present invention provides a drawing tower 6, the drawing tower 6 includes a preheating heating element 60, a melting heating element 61, a heat preservation heating element 62, an annealing furnace 63, and a temperature detector; among them,
  • the preheating heating element 60 is used for preheating the optical fiber preform, and the preheating heating element 60 has a preheating zone 600 for accommodating the optical fiber preform;
  • the fusion heating element 61 is used to fuse the preheated optical fiber preform into a solid rod to form an ultra-low attenuation optical fiber 7.
  • the fusion heating element 61 has a fusion zone 610 for accommodating the preheated optical fiber preform. Zone 610 is located below the preheating zone 600;
  • the heat preservation heating element 62 is used to slowly cool the ultra-low attenuation optical fiber 7 at a first preset temperature (usually about 2000°C) to remove the melting stress.
  • the heat preservation heating element 62 has a heat preservation element for accommodating the ultra-low attenuation optical fiber 7
  • the heat preservation zone 620, the heat preservation zone 620 is located below the melting zone 610;
  • the annealing furnace 63 is used to normally anneal the ultra-low attenuation optical fiber 7 from which the melting stress has been removed at a second preset temperature (far less than the first preset temperature, usually room temperature, such as about 25°C) to remove the interface stress.
  • the annealing furnace 63 has an annealing zone 630 for accommodating the ultra-low attenuation optical fiber 7, and the annealing zone 630 is located below the holding zone 620;
  • the temperature detector includes an upper temperature detector 64 and a lower temperature detector 65.
  • the upper temperature detector 64 is used to detect the temperature at which the ultra-low attenuation fiber 7 from which the melting stress has been removed enters the annealing furnace 63
  • the lower temperature detector 65 is used to detect The temperature at which the ultra-low attenuation optical fiber 7 from which the melting stress is removed leaves the annealing furnace 63.
  • the temperature of the heat-retaining heating element 62 is adjusted so that the temperature of the ultra-low attenuation optical fiber 7 entering the annealing furnace 63 meets the predetermined requirements.
  • the temperature of the annealing furnace 63 is adjusted so that the temperature of the ultra-low attenuation optical fiber 7 when it leaves the annealing furnace 63 meets the predetermined requirements, so as to meet the stress removal requirements.
  • the sixth embodiment of the present invention provides an ultra-low attenuation optical fiber manufactured by using the optical fiber preform of the first embodiment, which includes a core layer 4 and a cladding layer 5 sheathed outside the core layer 4;
  • the core layer 4 includes a potassium-doped core region 40 and a potassium-fluorine co-doped core region 41 arranged in order from the inside to the outside;
  • the cladding layer 5 includes a deep fluorine doped area 50, a shallow fluorine doped area 51 and a quartz area arranged in order from the inside to the outside. 52; Under the working wavelength of 1550nm, the attenuation of the ultra-low attenuation fiber is less than 0.150dB/km.
  • the diameter of the potassium-doped core region 40 and the diameter of the potassium-fluorine co-doped core region 41 are D 40 and D 41 , respectively, the thickness of the deep fluorine-doped region 50 and the thickness of the shallow fluorine-doped region 51 are H 50 and H 51 , respectively, and 1.1 ⁇ D 41 /D 40 ⁇ 1.5, 3 ⁇ H 50 /D 40 ⁇ 5, 0.05 ⁇ H 51 /H 50 ⁇ 0.2.
  • the diameter of the optical fiber preform of the above-mentioned embodiment 1 reaches 150mm, the drawing speed reaches 2000m/min, and the drawn fiber 1-3 has an attenuation of 0.150dB/km at 1550nm.
  • the bending performance of the fiber with a smaller core diameter is better. some.
  • a seventh embodiment of the present invention provides an ultra-low attenuation optical fiber manufactured by using the optical fiber preform of the third embodiment, which includes a core layer 4 and a cladding layer 5 sheathed outside the core layer 4;
  • the core layer 4 includes a potassium-doped core region 40 and a potassium-fluorine co-doped core region 41 arranged in order from the inside to the outside;
  • the cladding layer 5 includes a deep fluorine doped area 50, a shallow fluorine doped area 51 and a quartz area arranged in order from the inside to the outside. 52; Under the working wavelength of 1550nm, the attenuation of the ultra-low attenuation fiber is less than 0.150dB/km.
  • the diameter of the potassium-doped core region 40 and the diameter of the potassium-fluorine co-doped core region 41 are D 40 and D 41 , respectively, the thickness of the deep fluorine-doped region 50 and the thickness of the shallow fluorine-doped region 51 are H 50 and H 51 , respectively, and 1.1 ⁇ D 41 /D 40 ⁇ 1.5, 3 ⁇ H 50 /D 40 ⁇ 5, 0.05 ⁇ H 51 /H 50 ⁇ 0.2.
  • the diameter of the optical fiber preform used in the third embodiment above can reach 150mm, the drawing speed can reach 2200m/min, and the drawn fiber 4 ⁇ 6, its 1550nm attenuation can reach 0.150dB/km, and the fiber with a smaller core diameter has better bending performance Some of them, the splicing loss of fiber 6 and conventional G.652D fiber can be controlled at 0.1dB.

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PCT/CN2019/124974 2019-06-12 2019-12-13 用于制造超低衰减光纤的光纤预制棒、方法及光纤 WO2020248553A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
MX2021006383A MX2021006383A (es) 2019-06-12 2019-12-13 Preforma de fibra optica y metodo para fabricar fibra optica de atenuacion ultrabaja, y fibra optica.
BR112021008406-1A BR112021008406A2 (pt) 2019-06-12 2019-12-13 Pré-forma de fibra óptica, método para fabricar uma fibra óptica de atenuação ultrabaixa, e, fibra óptica de atenuação ultrabaixa
RU2021111844A RU2768315C1 (ru) 2019-06-12 2019-12-13 Заготовка оптического волокна и способ изготовления оптического волокна со сверхнизким ослаблением, а также оптическое волокно

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