WO2011147272A1 - Fibre optique multi-mode anti-flexion - Google Patents

Fibre optique multi-mode anti-flexion Download PDF

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Publication number
WO2011147272A1
WO2011147272A1 PCT/CN2011/074242 CN2011074242W WO2011147272A1 WO 2011147272 A1 WO2011147272 A1 WO 2011147272A1 CN 2011074242 W CN2011074242 W CN 2011074242W WO 2011147272 A1 WO2011147272 A1 WO 2011147272A1
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Prior art keywords
layer
refractive index
optical fiber
cladding
quartz glass
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PCT/CN2011/074242
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English (en)
Chinese (zh)
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曹蓓蓓
张方海
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长飞光纤光缆有限公司
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Publication of WO2011147272A1 publication Critical patent/WO2011147272A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
    • G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03661—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 4 layers only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03688—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 5 or more layers

Definitions

  • the present invention relates to a bending-resistant multimode optical fiber for use in an access network or miniaturized optical device, and more particularly to an optical fiber having a lower bending additional attenuation, which belongs to the field of optical communication technology.
  • Bending-resistant multimode fiber has been greatly improved in bending performance, minimizing signal loss and enabling faster and more efficient fiber path, cabling and installation. Cabling in a narrow environment requires that the bend-resistant multimode fiber can withstand small angle bends with a radius equal to or less than 10 mm and its signal loss is much less than that of conventional multimode fibers.
  • the new bend-resistant multimode fiber is easier to operate and install than copper, allowing fiber to be deployed in more locations.
  • an effective way to reduce the additional attenuation of fiber bending is to use a depressed cladding design in which a layer having a lower refractive index is added to the cladding to achieve the effect of confining optical power.
  • the refractive index profiles are mainly "groove type” (shown in Figures 1 and 3) and "double-clad type” (shown in Figure 2).
  • U.S. Patents US20080166094A1, US20090169163A1 and US20090154888A1 are such designs.
  • the design principle is: When the fiber is subjected to small bending, the light leaking from the core is easily confined to the inner cladding and returned to the core, thereby reducing the additional attenuation of the fiber macrobend.
  • the addition of a layer having a low refractive index to the cladding has the disadvantage that the range of the layered refractive index is limited, that is, it is difficult to achieve a layered refractive index of less than -1.5%, and the process complexity is high and the product uniformity is poor. How to ensure the optical performance consistency of such fibers and the long-term operation in the small radius bending state remains to be further studied.
  • Existing multimode fibers are difficult to meet the demanding optical performance and reliability requirements at small bend radii.
  • Mandrel a quartz glass piece containing a core or core layer and a partial cladding
  • Preform A quartz glass component that has a reasonable geometric and optical parameter that can be melt drawn into an optical fiber;
  • Refractive index When light is refracted from a vacuum injection medium, the ratio of the sine of the incident angle to the sine of the refraction angle is called the "absolute refractive index" of the medium.
  • Relative refractive index difference X 100% *" ⁇ °- X 100 %, and 3 ⁇ 4 are each
  • Refractive index profile The relationship between the refractive index of the glass and its radius, as indicated by a graph of the fiber or fiber preform (including the mandrel);
  • Low refractive index The refractive index of the material is smaller than that of pure quartz glass, which is called low refractive index. Pure quartz glass has a refractive index of 1.458 at 589 nm and a refractive index of 1.457 at 630 nm. The refractive index is lower than that of pure quartz glass at the same wavelength.
  • the coating is called a low refractive index coating;
  • Radius the distance between the outer boundary of the layer and the center point
  • Power exponential refractive index profile a refractive index profile that satisfies the power exponential function below, where is the refractive index of the fiber axis; r is the distance from the fiber axis; a is the fiber core radius; a is the distribution index; ⁇ is the core /package relative refractive index difference;
  • n 2 (r) n ⁇ [l - 2A(-) a ] r ⁇ a
  • the technical problem to be solved by the present invention is to provide a bending-resistant multimode optical fiber having a lower bending additional attenuation in view of the deficiencies of the prior art described above.
  • the technical solution of the multimode optical fiber proposed by the invention comprises: an optical fiber and a coating coated on the outer surface of the optical fiber, the optical fiber being composed of a quartz glass core layer having a parabolic or step-shaped refractive index profile structure and surrounding the core layer Quartz glass cladding composition, the difference is: the core layer diameter 2R1 is 20 ⁇ 200 ⁇ , composed of ytterbium-doped (Ge) and fluorine (F) quartz glass materials, the cladding is covered with double The layer-cured polymer coating, the inner coating coated on the outer surface of the cladding is a low refractive index flexible polymer coating, and the outer coating is a high Young's modulus polymer coating.
  • the cladding layer is a pure quartz glass cladding layer surrounding the core layer, or a sum of pure quartz and a doped quartz glass cladding layer, and the outermost quartz glass cladding layer has a diameter of 80 ⁇ m to 230 ⁇ m.
  • the inner coating layer has a Young's modulus of less than or equal to 10 MPa in the range of -65 ° C to 85 ° C, a typical Young's modulus range is 0.5 MPa to 2 MPa, and a refractive index (589 nm wavelength sodium yellow)
  • the range of light is 1.37 to 1.455; the outer coating is in the range of -65 ° C to 55 ° C.
  • the Young's modulus ranges from 500 MPa to 1500 MPa, the typical range is from 700 MPa to 1000 MPa, and the refractive index ranges from 1.47 to 1.78.
  • the layer refractive index has no significant effect on the fiber properties.
  • the inner coating layer is a UV-curable or heat-curable flexible silicone rubber coating, and the inner coating layer has a thickness of 10 ⁇ m to 40 ⁇ m ; the outer coating layer is ultraviolet light curing or heat curing. Polyacrylate coating, the outer coating has a diameter of 160 ⁇ 260 ⁇ .
  • the multimode fiber has a typical additional bending attenuation of less than or equal to 0.15 dB, or even less than or equal to 0.05 dB, at a wavelength of 850 nm with a radius of 10 mm around one turn.
  • the refractive index profile of the core layer is parabolic, (1.9 to 2.2, the relative refractive index difference ⁇ 1 is 0.9% to 1.2%, the inner coating refractive index range is 1.40 to 1.43, and the core diameter is 47 ⁇ 53 ⁇ .
  • the dynamic fatigue parameter Nd is equal to or greater than 26; at a wavelength of 850nm and a wavelength of 1300nm with a bandwidth of 500MHz-km or more, by adjusting the power exponential refractive index profile, the optimized 850nm wavelength window can reach 2000MHz-km or even 5000MHz. Bandwidth above -km.
  • the refractive index profile of the core layer is parabolic, (1.9 to 2.2, the relative refractive index difference ⁇ 1 is 1.8% to 2.3%, and the core layer diameter is 60 ⁇ to 65 ⁇ .
  • the refractive index profile of the core layer is stepped, and the relative refractive index difference ⁇ 1 is 0.3% to 2.2%.
  • the double-coated composite structure used in the present invention combines the advantages of the two coatings, can improve the mechanical properties of the optical fiber and minimize the microbending loss: the flexible inner coating can alleviate the pressure on the outer surface of the glass cladding and reduce the microbending loss.
  • the optical power loss, high Young's modulus of the outer coating can withstand large mechanical forces, the fiber is protected from mechanical damage during processing, transportation and use.
  • the method for manufacturing the multimode optical fiber of the present invention comprises: fixing a pure quartz glass liner on a plasma enhanced chemical vapor deposition (PCVD) lathe for doping deposition, and introducing a gas containing F into the reaction gases SiCl 4 and 02 ; Introducing F doping, introducing GeCl 4 to introduce Ge doping, ionizing the reaction gas in the liner into a plasma by microwave, and finally depositing it on the inner wall of the liner in the form of glass; according to the doping of the fiber waveguide structure Miscellaneous requirements, the waveguide structure curve is subdivided into thousands to 10,000 layers of thin layer step-by-step deposition, and the core layer with precise refractive index distribution is realized by programmatically controlling the flow rate and ratio of the doping gas in each mixed gas; Upon completion, the deposition tube is melted into a solid mandrel using an electric heating furnace.
  • PCVD plasma enhanced chemical vapor deposition
  • the solid mandrel is placed in a pure quartz glass hollow tube with suitable size parameters to form a preform for preparing the optical fiber, or a pure quartz glass layer is deposited on the surface of the mandrel by an OVD process as a cladding and then fired into a preform.
  • the preform is placed in a drawing tower to form a fiber, and the inner and outer layers of the polymer coating are coated on the surface of the fiber to form an optical fiber.
  • the additional bending attenuation of the fiber consists of both macrobend additional attenuation and microbend additional attenuation.
  • Increasing the fiber's resistance to bending can be achieved by optimizing the structure to reduce both attenuations.
  • the inner coating material uses a low refractive index polymer
  • the low refractive index of the elastomer which limits the light leaking from the core, is confined to the quartz glass cladding and returned to the core, thereby reducing the additional attenuation of the fiber macrobend.
  • it has a Young's modulus of less than 10 MPa in the range of -65 ° C to 85 ° C, and a typical Young's modulus range of 0.5 MPa to 2 MPa. This property minimizes the glass cladding and the inner layer.
  • the stress at the coating and the optical power loss caused by the irregular deformation reduce the additional attenuation of the microbend, thereby improving the bending resistance of the fiber.
  • the beneficial effects of the present invention are as follows: 1.
  • the design of the low refractive index inner coating avoids the introduction of additional stress in the quartz glass cladding and the core layer, and the low refractive index characteristic can limit the light leaked from the core to the quartz.
  • the glass cladding is returned to the core, thereby reducing the additional attenuation of the fiber macrobend, avoiding the attenuation and bandwidth loss caused by the additional stress;
  • the design of the low refractive index inner coating avoids the internal stress of the fiber and greatly improves the fiber.
  • the mechanical properties ensure the performance and service life of the fiber working under small radius bending conditions, and have excellent bending resistance. 3.
  • the design of the low refractive index inner coating is equivalent to the introduction of the "sag layer” outside the quartz glass cladding. ", this can change the parameters of the "sag layer” by flexibly adjusting the properties of the coating, such as the diameter and depth of the trap layer, etc., and the parameters can be adjusted in the drawing process without adding unstable factors in the complicated preform design. Thereby, the reliability of the wire drawing manufacturing process is improved; 4.
  • the manufacturing method of the invention is simple and effective, and is suitable for mass production.
  • FIG. 1 is a schematic view showing the structure of a refractive index profile in a first embodiment of the present invention
  • Fig. 2 is a schematic view showing the structure of a refractive index profile in a second embodiment of the present invention.
  • Fig. 3 is a schematic view showing the structure of a refractive index profile in the third embodiment of the present invention.
  • Fig. 4 is a view showing the structure of a refractive index profile of a fourth embodiment of the present invention.
  • Fig. 5 is a view showing the structure of a refractive index profile in a fifth embodiment of the present invention.
  • Fig. 6 is a view showing the structure of a refractive index profile of a sixth embodiment of the present invention.
  • Fig. 7 is a view showing the structure of a refractive index profile of a step type energy transmission fiber according to Embodiments 7 and 8 of the present invention.
  • the refractive index parameter of the coating is expressed by the absolute refractive index.
  • the relative refractive index difference ⁇ of the coating is indicated in order to compare the refractive index of the coating with the core layer and the cladding.
  • the drawing uses ⁇ to indicate the relative refractive index difference of the quartz glass fiber core layer or cladding layer.
  • FIG. 1 is a schematic view showing the refractive index profile of a double-coated bending insensitive multimode fiber according to Embodiment 1 of the present invention.
  • the solid line in the figure indicates the refractive index structure of the quartz glass core and the cladding, and the broken line indicates the refractive index structure of the inner and outer coatings in the optical fiber.
  • ⁇ 1 represents the relative refractive index difference of the doped quartz glass core center, quartz in the structure
  • the relative refractive index difference of the glass cladding is 0;
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • R1 and R2 represent the radii of the core layer and the cladding, respectively, and rl and r2 represent the radii of the inner and outer coatings, respectively.
  • Fig. 2 is a schematic view showing the structure of a refractive index profile of the second embodiment.
  • the quartz glass cladding is divided into three layers, wherein the first and third layers are pure quartz layers, and the second layer is a depressed cladding layer.
  • ⁇ 1 and ⁇ 3 represent the relative refractive index difference between the core and the depressed cladding, respectively;
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • Rl, R2, R3, and R4 represent the core, the first cladding layered pure quartz layer, the second cladding layer, that is, the depressed cladding layer, and the radius of the third cladding layer, and the second layer radius R3 is 28 ⁇ m. ⁇ 58 ⁇ ;
  • the relative refractive index difference ⁇ 3 is -0.50% to -0.90%.
  • Rl and r2 represent the radius of the inner and outer coatings, respectively.
  • Fig. 3 is a schematic view showing the structure of a refractive index profile of the third embodiment.
  • the quartz glass cladding is divided into two layers, wherein the first layer is a pure quartz layer, and the second layer is a low refractive index depressed cladding.
  • ⁇ 1 and ⁇ 3 represent the relative refractive indices of the core and the depressed cladding, respectively;
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • Rl, R2, and R3 respectively represent the core, the first cladding layered pure silica layer, and the second cladding layer, that is, the radius of the depressed cladding layer, and the second layering radius R3 is 28 ⁇ to 63 ⁇ ; the relative refractive index difference ⁇ 3 is -0.40% to -1.00%.
  • Rl and r2 represent the radius of the inner and outer coatings, respectively.
  • Fig. 4 is a view showing the structure of a refractive index profile of the fourth embodiment.
  • the quartz glass cladding is divided into two layers, wherein the first layer is a low refractive index depressed cladding layer, and the second layer is a pure quartz layer.
  • ⁇ 1 and ⁇ 2 represent the relative refractive indices of the core and the depressed cladding, respectively;
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • Rl, R2, and R3 respectively represent the core, the first cladding layer, that is, the depressed cladding layer, and the radius of the second cladding layer.
  • the first layering radius R2 is 21 ⁇ 58 ⁇ ; the relative refractive index difference ⁇ 2 is -0.40%. To -0.80%.
  • Rl and r2 represent the radius of the inner and outer coatings, respectively.
  • Fig. 5 is a view showing the structure of a refractive index profile of the fifth embodiment.
  • the quartz glass cladding is divided into four layers, wherein the first layer is a pure quartz layer, the second layer is a low refractive index depressed cladding layer, and the third layer is a doped high refractive index quartz layer, the fourth layer.
  • the layer is a layer of pure quartz. ⁇ 1, ⁇ 3, and ⁇ 4 represent the relative refractive indices of the core, the depressed cladding, and the high refractive index doped quartz layer, respectively, the second layering radius R3 is 28 ⁇ to 55 ⁇ , and the relative refractive index difference ⁇ 3 is -0.40% to -1.10%.
  • the third layering radius R4 is 31 ⁇ m to 58 ⁇ m, and the relative refractive index difference ⁇ 4 is 0.1% to 0.8%.
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • R1, R2, R3, R4, and R5 respectively represent a core, a first cladding layer, a second cladding layer, that is, a depressed cladding layer, a third cladding layer, that is, a high refractive index doped quartz layer, and a fourth package.
  • Layer stratification is the radius of the pure quartz layer.
  • Rl and r2 represent the radius of the inner and outer coatings, respectively.
  • Fig. 6 is a schematic view showing the refractive index profile of a double-coated bending insensitive multimode fiber according to Embodiment 6 of the present invention.
  • the solid line in the figure indicates the refractive index structure of the quartz glass core and the cladding, and the dotted line indicates the inner and outer coatings.
  • ⁇ 1 represents the relative refractive index difference of the center of the doped quartz glass core, and the relative refractive index difference of the quartz glass cladding in the structure is 0;
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • R1 and R2 represent the radii of the core layer and the cladding, respectively, and rl and r2 represent the radii of the inner and outer coatings, respectively.
  • Fig. 7 is a view showing the structure of a refractive index profile of a step type energy transmission fiber according to Embodiments 7 and 8 of the present invention.
  • the solid line in the figure indicates the refractive index structure of the quartz glass core and the cladding, and the broken line indicates the refractive index structure of the inner and outer coatings in the fiber.
  • the relative refractive index difference ⁇ 1 of the doped quartz glass core is 0.3% to 1.2%.
  • the cladding is a doped quartz glass cladding with a low refractive index
  • the relative refractive index difference ⁇ 2 of the cladding is -0.1% to -1.1. %.
  • ⁇ ⁇ and ⁇ 2 represent the relative refractive indices of the inner and outer coatings, respectively.
  • Rl and R2 represent the radii of the core and cladding, respectively, and rl and r2 represent the radii of the inner and outer coatings, respectively.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Glass Compositions (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)

Abstract

La présente invention concerne une fibre optique multi-mode anti-flexion destinée à un réseau d'accès et un dispositif optique miniaturisé qui comprend une fibre optique et une couche de revêtement qui couvre la fibre optique. La fibre optique est composée d'une couche de base en verre de quartz dotée d'un indice en forme de parabole ou d'une structure de profil à saut d'indice et d'une couche de gainage en verre de quartz entourant la couche de base. La couche de base est constituée d'un matériau en verre de quartz dopé avec du germanium et du fluor. La couche de gainage est recouverte de deux couches de revêtement en polymère durci, la couche de revêtement interne étant une couche de revêtement en polymère flexible à faible indice de réfraction et la couche de revêtement externe étant une couche de revêtement en polymère à module de Young élevé. La couche de revêtement interne de la fibre optique multi-mode à faible indice de réfraction évite les contraintes internes dans la fibre optique, ce qui améliore les performances mécaniques de la fibre optique et garantit de meilleures performances d'utilisation et une plus grande longévité de la fibre optique opérant dans un état de flexion à faible rayon.
PCT/CN2011/074242 2010-05-28 2011-05-18 Fibre optique multi-mode anti-flexion WO2011147272A1 (fr)

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CN201010190379.9 2010-05-28
CN 201010190379 CN101840023B (zh) 2010-05-28 2010-05-28 一种抗弯曲多模光纤

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WO2013028513A1 (fr) * 2011-08-19 2013-02-28 Corning Incorporated Fibre optique à faibles pertes par courbure
US9188736B2 (en) 2013-04-08 2015-11-17 Corning Incorporated Low bend loss optical fiber
EP4145196A4 (fr) * 2020-04-26 2024-04-10 Zhongtian Tech Fiber Potics Co Ltd Fibre optique

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CN102043197A (zh) * 2011-01-26 2011-05-04 长飞光纤光缆有限公司 一种抗弯曲多模光纤
US8792763B2 (en) * 2011-03-07 2014-07-29 Corning Incorporated Bend resistant multimode optical fiber
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CN102981215B (zh) * 2012-11-19 2015-05-13 中天科技光纤有限公司 涂层易于剥离的小包层直径低水峰单模光纤及其生产工艺
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CN103472530B (zh) * 2013-09-23 2015-12-23 长飞光纤光缆股份有限公司 一种大芯径弯曲不敏感传能光纤
CN104880766B (zh) * 2015-06-25 2018-01-12 长飞光纤光缆股份有限公司 一种超低衰减单模光纤
CN106526743A (zh) * 2016-08-22 2017-03-22 长飞光纤光缆股份有限公司 一种超低衰减单模光纤
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CN106772781B (zh) * 2017-01-12 2019-06-21 烽火通信科技股份有限公司 一种适用于光纤连接器制作的抗弯光纤
CN107561636B (zh) * 2017-09-20 2020-01-14 长飞光纤光缆股份有限公司 一种用于天文望远镜系统的光纤
CN110244402B (zh) * 2019-04-25 2022-04-19 桂林电子科技大学 一种超低损耗大有效面积单模光纤设计及其制造方法
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CN113698092B (zh) * 2020-12-14 2022-12-16 深圳纤亿通科技有限公司 一种光纤及其制备方法
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CN116589174A (zh) * 2023-05-09 2023-08-15 中天科技光纤有限公司 石英预制件、光纤及光纤制备方法

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