WO2022027796A1 - Bend-resistant optical fiber manufacturing method and optical fiber corresponding thereto - Google Patents

Bend-resistant optical fiber manufacturing method and optical fiber corresponding thereto Download PDF

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WO2022027796A1
WO2022027796A1 PCT/CN2020/115769 CN2020115769W WO2022027796A1 WO 2022027796 A1 WO2022027796 A1 WO 2022027796A1 CN 2020115769 W CN2020115769 W CN 2020115769W WO 2022027796 A1 WO2022027796 A1 WO 2022027796A1
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optical fiber
layer
core layer
refractive index
bending
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PCT/CN2020/115769
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French (fr)
Chinese (zh)
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钟媛
姚艳
王亚玲
冯永明
和联科
郇朝阳
劳雪刚
沈震强
肖华
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江苏亨通光导新材料有限公司
江苏亨通光电股份有限公司
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Publication of WO2022027796A1 publication Critical patent/WO2022027796A1/en

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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
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • 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]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
    • G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02266—Positive dispersion fibres at 1550 nm
    • 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 - - +

Definitions

  • the invention relates to the technical field of optical fiber communication, in particular to a method for manufacturing a bending-resistant optical fiber, and the invention also provides a bending-resistant optical fiber.
  • Optical fiber access network is the "last mile" of the information highway, realizing high-speed information transmission and high-quality, high-bandwidth and reliable connections between telecom operators and end users, not only a broadband backbone transmission network. , the user access part is even more critical.
  • the application scenarios of optical fiber access networks are relatively complex, such as buildings, streets, and houses, with many fiber nodes and many tortuous wirings.
  • Optical fibers even need to be placed in crowded pipes or fixed in junction boxes and sockets after many times of bending. In the line terminal equipment with narrow space, this puts forward higher requirements on the bending performance of the optical fiber.
  • the present invention provides a method for manufacturing a bend-resistant optical fiber, and the bend-resistant optical fiber formed by the manufacture is suitable for dense wiring in a narrow indoor environment.
  • a method for manufacturing a bend-resistant optical fiber comprising the following steps:
  • the loose body is prepared by the VAD method.
  • the loose body includes a core layer and an inner cladding layer.
  • the core layer passes through SiCl 4 and GeCl 4 raw materials, and the inner cladding layer passes through SiCl 4 and CF 4 raw materials.
  • the density of the bulk body is 0.24 ⁇ 0.26g/cm 3 , the CF4 material of the inner cladding layer is diffused to the core layer, and the core layer is F-doped;
  • the diameter ratio of the inner cladding layer and the core layer of the first extending mandrel is 2.0-3.0, the relative refractive index difference of the core layer is 0.29%-0.34%, and the inner cladding layer is 0.29%-0.34%.
  • the relative refractive index difference is -0.12% to -0.04%, and the contribution of F to the refractive index of the core layer is -0.08% to -0.03%;
  • the first extension mandrel, the fluorine-doped sleeve, and the synthetic sleeve are pickled. After pickling, the fluorine-doped sleeve is inserted into the synthetic sleeve, and then the first extension mandrel is inserted into the fluorine-doped sleeve to form an assembly.
  • the second extension core rod and the chlorine-free synthetic quartz sleeve are assembled to obtain an optical fiber preform, and the optical fiber preform is drawn to obtain a bending-resistant optical fiber.
  • the wire drawing speed is 2000 m/min, and the wire drawing adopts an annealing process.
  • a bending-resistant optical fiber is characterized in that: it is a core layer, an inner cladding layer, a depressed cladding layer, a barrier layer and an outer cladding layer in order from the center radially outward, the depressed cladding layer is made of fluorine-doped material, and the barrier layer
  • the material of the barrier layer and the outer layer are made of synthetic quartz material, the material of the barrier layer contains chlorine, the material of the outer layer does not contain chlorine, the relative refractive index difference ⁇ 1 of the core layer is 0.29% to 0.34%, and the refractive index of fluorine to the core layer is 0.29% to 0.34%.
  • the contribution is -0.08% to -0.03%, the relative refractive index difference ⁇ 2 of the inner cladding is -0.12% to -0.04%, the relative refractive index difference ⁇ 3 of the depressed cladding is -0.50% to -0.25%, and the relative refractive index difference of the barrier layer is -0.12% to -0.04%.
  • the compressive stress of the core layer is -50Mpa ⁇ -20Mpa;
  • the attenuation coefficient of the fiber at 1550nm is less than or equal to 0.185dB/km;
  • the mode field diameter of the fiber at 1310nm is 8.2 ⁇ 8.8 ⁇ m
  • the cable cut-off wavelength is ⁇ 1260nm
  • the zero dispersion wavelength of the fiber is 1300nm ⁇ 1324nm;
  • the zero dispersion wavelength is 1304nm ⁇ 1324nm;
  • the additional loss of macrobending at 1550nm and 1625nm with 15mm bending radius is less than 0.03dB and 0.1dB respectively
  • the additional macrobending loss of 1550nm and 1625nm in 1 turn is less than 0.03dB and 0.1dB respectively
  • the additional loss of 1550nm and 1625nm in 7.5mm bending radius is less than 0.08dB and 0.25dB respectively
  • the macrobending additional loss at 1550nm and 1625nm is less than 0.15dB and 0.45dB respectively
  • the dispersion at 1550nm is less than or equal to 18ps/(nm ⁇ km)
  • the dispersion at 1625nm is less than or equal to 22ps/(nm ⁇ km)
  • the zero dispersion slope is less than 0.092ps/(nm 2 ⁇ km ).
  • a small amount of doping of the core layer F can be realized under the premise that the core layer does not pass through the CF 4 raw material, and the co-doping of GeO 2 and F in the core layer can effectively reduce the core layer. Viscosity, the viscosity of the core layer and the inner cladding layer are more matched, the defects generated in the optical fiber process are reduced, and the optical fiber attenuation is improved;
  • the synthetic material barrier layer contains a small amount of chlorine, and the setting of the barrier layer can make the fiber sink into the cladding layer. There is a transition in the stress to the outer cladding, which is beneficial to reduce attenuation;
  • Reasonable optical fiber profile structure design makes the fiber core layer subject to compressive stress, which further reduces the GeO 2 doping content of the core layer and further reduces the attenuation;
  • the manufacturing method is simple and suitable for mass production.
  • FIG. 1 is a schematic diagram of the refractive index distribution of the cross-section of the single-mode optical fiber of the present invention. .
  • a method for manufacturing a bend-resistant optical fiber comprising the following steps:
  • the loose body is prepared by the VAD method.
  • the loose body includes a core layer and an inner cladding layer.
  • the core layer passes through SiCl 4 and GeCl 4 raw materials, and the inner cladding layer passes through SiCl 4 and CF 4 raw materials.
  • the density of the bulk body is 0.24 ⁇ 0.26g/cm 3 , the CF4 material of the inner cladding layer is diffused to the core layer, and the core layer is F-doped;
  • the diameter ratio of the inner cladding layer and the core layer of the first extending mandrel is 2.0-3.0, the relative refractive index difference of the core layer is 0.29%-0.34%, and the inner cladding layer is 0.29%-0.34%.
  • the relative refractive index difference is -0.12% to -0.04%, and the contribution of F to the refractive index of the core layer is -0.08% to -0.03%;
  • the first extension mandrel, the fluorine-doped sleeve, and the synthetic sleeve are pickled. After pickling, the fluorine-doped sleeve is inserted into the synthetic sleeve, and then the first extension mandrel is inserted into the fluorine-doped sleeve to form an assembly.
  • the second extension mandrel and the chlorine-free synthetic quartz sleeve are assembled to obtain an optical fiber preform, and the optical fiber preform is drawn to obtain a low-loss bend-insensitive optical fiber, wherein the drawing speed is 2000 m/min, and the drawing adopts annealing craft.
  • a bending-resistant optical fiber the core layer, the inner cladding layer, the sunk cladding layer, the barrier layer and the outer cladding are sequentially arranged radially outward from the center, the sag cladding layer is made of fluorine-doped material, and the barrier layer and the outer cladding are made of synthetic quartz material , the barrier layer material contains chlorine, the outer cladding material does not contain chlorine, the relative refractive index difference ⁇ 1 of the core layer is 0.29% to 0.34%, the contribution of F to the refractive index of the core layer is -0.08% to -0.03%, and the relative refractive index difference of the inner cladding layer is -0.08% to -0.03%.
  • the refractive index difference ⁇ 2 is -0.12% to -0.04%
  • the relative refractive index difference ⁇ 3 of the depressed cladding is -0.50% to -0.25%
  • the relative refractive index difference ⁇ 4 of the barrier layer is 0.01% to 0.03%
  • the compressive stress of the core layer is -50Mpa ⁇ -20Mpa;
  • the attenuation coefficient of the fiber at 1550nm is less than or equal to 0.185dB/km;
  • the mode field diameter of the fiber at 1310nm is 8.2 ⁇ 8.8 ⁇ m
  • the cable cut-off wavelength is ⁇ 1260nm
  • the zero dispersion wavelength of the fiber is 1300 ⁇ 1324nm
  • the additional macrobending losses of 1550nm and 1625nm in one turn are less than 0.1dB and 0.2dB, respectively;
  • the additional losses of 1550nm and 1625nm with a bending radius of 7.5mm are less than 0.4dB and 0.8dB respectively;
  • the zero dispersion slope is less than 0.092ps/ (nm 2 km);
  • the additional loss of macrobending at 1550nm and 1625nm with 15mm bending radius is less than 0.03dB and 0.1dB respectively
  • the additional macrobending loss of 1550nm and 1625nm in 1 turn is less than 0.03dB and 0.1dB respectively
  • the additional loss of 1550nm and 1625nm in 7.5mm bending radius is less than 0.08dB and 0.25dB respectively
  • the macrobending additional loss at 1550nm and 1625nm is less than 0.15dB and 0.45dB respectively
  • the dispersion at 1550nm is less than or equal to 18ps/(nm ⁇ km)
  • the dispersion at 1625nm is less than or equal to 22ps/(nm ⁇ km)
  • the zero dispersion slope is less than 0.092ps/(nm 2 ⁇ km ).
  • the relative refractive index difference ⁇ 1 of the core layer is 0.32%
  • the relative refractive index difference ⁇ 2 of the inner cladding layer is -0.067%
  • the relative refractive index difference ⁇ 3 of the depressed cladding layer is -0.30%
  • the relative refractive index difference of the barrier layer is -0.30%.
  • the relative refractive index difference ⁇ 1 of the core layer is 0.305%
  • the relative refractive index difference ⁇ 2 of the inner cladding layer is -0.042%
  • the relative refractive index difference ⁇ 3 of the depressed cladding layer is -0.45%
  • the relative refractive index difference of the barrier layer is -0.45%.
  • ⁇ c is the outer cladding refractive index
  • the synthetic material barrier layer contains a small amount of chlorine, and the setting of the barrier layer can make the fiber sink into the cladding layer. There is a transition in the stress to the outer cladding, which is beneficial to reduce attenuation;
  • Reasonable optical fiber profile structure design makes the fiber core layer subject to compressive stress, which further reduces the GeO 2 doping content of the core layer and further reduces the attenuation;
  • the manufacturing method is simple and suitable for mass production.

Abstract

The present invention provides a bend-resistant optical fiber manufacturing method. A bend-resistant optical fiber manufactured by the method is suitable for dense wiring in an indoor narrow environment. The bend-resistant optical fiber manufacturing method comprises the following steps: S1, preparing a loose body by means of a VAD method, the loose body comprising a core layer and an inner cladding layer; S2, after deposition of the loose body is completed, transferring the loose body into a sintering furnace for dehydration and sintering to obtain a sintered core rod; S3, extending the sintered core rod to obtain a first extended core rod; S4, performing acid pickling on the first extended core rod, a fluorine-doped sleeve, and a synthetic sleeve, inserting the fluorine-doped sleeve into the synthetic sleeve after acid pickling, and then inserting the first extended core rod into the fluorine-doped sleeve to form an assembled core rod; S5, extending the assembled core rod to obtain a second extended core rod; and S6, assembling the second extended core rod and a chlorine-free synthetic quartz sleeve to obtain an optical fiber preform, and drawing the optical fiber preform to obtain the bend-resistant optical fiber.

Description

一种抗弯曲光纤的制造方法及其对应的光纤A kind of manufacturing method of bending-resistant optical fiber and corresponding optical fiber 技术领域technical field
本发明涉及光纤通信的技术领域，具体为一种抗弯曲光纤的制造方法，本发明还提供了一种抗弯曲光纤。The invention relates to the technical field of optical fiber communication, in particular to a method for manufacturing a bending-resistant optical fiber, and the invention also provides a bending-resistant optical fiber.
背景技术Background technique
光纤接入网(Access Network)是信息高速公路的“最后一公里”，实现信息的高速传输以及电信运营商和终端用户之间的高质量、高带宽可靠连接，不仅要有宽带的主干传输网络，用户接入部分更是关键。光纤接入网的应用场景较为复杂，如楼宇、街道、房屋中，光纤节点多、曲折布线多，光纤甚至需要被安放在拥挤的管道中或者经过多次弯曲后被固定在接线盒和插座等具有狭小空间的线路终端设备中，这对光纤的弯曲性能提出更高的要求。Optical fiber access network (Access Network) is the "last mile" of the information highway, realizing high-speed information transmission and high-quality, high-bandwidth and reliable connections between telecom operators and end users, not only a broadband backbone transmission network. , the user access part is even more critical. The application scenarios of optical fiber access networks are relatively complex, such as buildings, streets, and houses, with many fiber nodes and many tortuous wirings. Optical fibers even need to be placed in crowded pipes or fixed in junction boxes and sockets after many times of bending. In the line terminal equipment with narrow space, this puts forward higher requirements on the bending performance of the optical fiber.
发明内容SUMMARY OF THE INVENTION
针对上述问题，本发明提供了一种抗弯曲光纤的制造方法，其制造形成的抗弯曲光纤适合室内狭窄环境的密集布线。In view of the above problems, the present invention provides a method for manufacturing a bend-resistant optical fiber, and the bend-resistant optical fiber formed by the manufacture is suitable for dense wiring in a narrow indoor environment.
一种抗弯曲光纤的制造方法，包含如下步骤：A method for manufacturing a bend-resistant optical fiber, comprising the following steps:
S1.通过VAD法制备松散体，松散体包含芯层和内包层，芯层通SiCl 4和GeCl 4原料，内包层通SiCl 4和CF 4原料，松散体的密度为0.24～0.26g/cm 3，内包层CF 4原料通过扩散至芯层，对芯层进行F掺杂； S1. The loose body is prepared by the VAD method. The loose body includes a core layer and an inner cladding layer. The core layer passes through SiCl 4 and GeCl 4 raw materials, and the inner cladding layer passes through SiCl 4 and CF 4 raw materials. The density of the bulk body is 0.24～0.26g/cm 3 , the CF4 material of the inner cladding layer is diffused to the core layer, and the core layer is F-doped;
S2.松散体完成沉积后转入烧结炉进行脱水和烧结，得到烧结芯棒；S2. After the loose body is deposited, it is transferred to a sintering furnace for dehydration and sintering to obtain a sintered mandrel;
S3.烧结芯棒进行延伸，得到第一延伸芯棒，第一延伸芯棒的内包层和芯层的直径比值为2.0～3.0，芯层相对折射率差值为0.29％～0.34％，内包层 相对折射率差值为-0.12％～-0.04％，其中F对芯层的折射率贡献为-0.08％～-0.03％；S3. Sinter the mandrel to extend to obtain a first extended mandrel. The diameter ratio of the inner cladding layer and the core layer of the first extending mandrel is 2.0-3.0, the relative refractive index difference of the core layer is 0.29%-0.34%, and the inner cladding layer is 0.29%-0.34%. The relative refractive index difference is -0.12% to -0.04%, and the contribution of F to the refractive index of the core layer is -0.08% to -0.03%;
S4.第一延伸芯棒、掺氟套管、合成套管进行酸洗，酸洗后先将掺氟套管插入合成套管中，再将第一延伸芯棒插入掺氟套管中形成组装芯棒，其中掺氟套管的相对折射率差为-0.50％～-0.25％，合成套管以SiCl 4为原料制备，不进行其他掺杂，其相对折射率差为0.01％～0.03％； S4. The first extension mandrel, the fluorine-doped sleeve, and the synthetic sleeve are pickled. After pickling, the fluorine-doped sleeve is inserted into the synthetic sleeve, and then the first extension mandrel is inserted into the fluorine-doped sleeve to form an assembly. The mandrel, wherein the relative refractive index difference of the fluorine-doped sleeve is -0.50% to -0.25%, the synthetic sleeve is prepared from SiCl 4 without other doping, and the relative refractive index difference is 0.01% to 0.03%;
S5.对组装芯棒进行延伸，得到第二延伸芯棒，其中，掺氟套管层直径与芯层直径的比值为3.8～4.6，合成套管层直径与芯层直径比值为4.6～5.2；S5. Extend the assembled mandrel to obtain a second extended mandrel, wherein the ratio of the diameter of the fluorine-doped casing layer to the diameter of the core layer is 3.8 to 4.6, and the ratio of the diameter of the synthetic casing layer to the diameter of the core layer is 4.6 to 5.2;
S6.第二延伸芯棒、不含氯的合成石英套管进行组装得到光纤预制棒，对该光纤预制棒进行拉丝，得到抗弯曲光纤。S6. The second extension core rod and the chlorine-free synthetic quartz sleeve are assembled to obtain an optical fiber preform, and the optical fiber preform is drawn to obtain a bending-resistant optical fiber.
优选的，拉丝速度为2000m/min，拉丝采用退火工艺。Preferably, the wire drawing speed is 2000 m/min, and the wire drawing adopts an annealing process.
一种抗弯曲光纤，其特征在于：其自中心径向而外顺次为芯层、内包层、下陷包层、阻隔层和外包层，所述下陷包层采用掺氟材料，所述阻隔层和外包层均采用合成石英材料，所述阻隔层材料含氯，所述外包层材料不含氯，所述芯层的相对折射率差Δ1为0.29％～0.34％，氟对芯层的折射率贡献为-0.08％～-0.03％，内包层的相对折射率差Δ2为-0.12％～-0.04％，下陷包层的相对折射率差Δ3为-0.50％～-0.25％，阻隔层相对折射率差Δ4为0.01％～0.03％，各层半径满足如下关系：R1＝3.2μm～3.8μm，R2/R1＝2.0～3.0，R3/R1＝3.8～4.6，R4/R1＝4.6～5.2。A bending-resistant optical fiber is characterized in that: it is a core layer, an inner cladding layer, a depressed cladding layer, a barrier layer and an outer cladding layer in order from the center radially outward, the depressed cladding layer is made of fluorine-doped material, and the barrier layer The material of the barrier layer and the outer layer are made of synthetic quartz material, the material of the barrier layer contains chlorine, the material of the outer layer does not contain chlorine, the relative refractive index difference Δ1 of the core layer is 0.29% to 0.34%, and the refractive index of fluorine to the core layer is 0.29% to 0.34%. The contribution is -0.08% to -0.03%, the relative refractive index difference Δ2 of the inner cladding is -0.12% to -0.04%, the relative refractive index difference Δ3 of the depressed cladding is -0.50% to -0.25%, and the relative refractive index difference of the barrier layer is -0.12% to -0.04%. The difference Δ4 is 0.01%-0.03%, and the radius of each layer satisfies the following relationships: R1=3.2μm-3.8μm, R2/R1=2.0-3.0, R3/R1=3.8-4.6, R4/R1=4.6-5.2.
其进一步特征在于：It is further characterized by:
所述芯层所受到的压应力为-50Mpa～-20Mpa；The compressive stress of the core layer is -50Mpa～-20Mpa;
光纤在1550nm的衰减系数≤0.185dB/km；The attenuation coefficient of the fiber at 1550nm is less than or equal to 0.185dB/km;
光纤在1310nm的模场直径为8.2～8.8μm，成缆截止波长≤1260nm，光纤零色散波长为1300nm～1324nm；The mode field diameter of the fiber at 1310nm is 8.2~8.8μm, the cable cut-off wavelength is ≤1260nm, and the zero dispersion wavelength of the fiber is 1300nm~1324nm;
优选地，零色散波长为1304nm～1324nm；Preferably, the zero dispersion wavelength is 1304nm～1324nm;
优选地，Δ3的取值为-0.34％～-0.26％，R3/R1＝3.8～4.2，该光纤15mm弯曲半径绕10圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；10mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.1dB和0.2dB；7.5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.4dB和0.8dB；Preferably, the value of Δ3 is -0.34%～-0.26%, R3/R1=3.8～4.2, and the additional macrobending loss of 1550nm and 1625nm when the 15mm bending radius of the optical fiber is wound for 10 turns is less than 0.03dB and 0.1dB respectively; 10mm The additional macrobending losses of 1550nm and 1625nm with a bending radius of one turn are less than 0.1dB and 0.2dB respectively; the additional losses of 1550nm and 1625nm with a bending radius of 7.5mm are less than 0.4dB and 0.8dB respectively;
Δ3的取值为-0.46％～-0.38％，R3/R1＝4.2～4.6，该光纤15mm弯曲半径绕10圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；10mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；7.5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.08dB和0.25dB；5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.15dB和0.45dB，1550nm色散≤18ps/(nm·km)，1625nm色散≤22ps/(nm·km)，零色散斜率小于0.092ps/(nm 2·km)。 The value of Δ3 is -0.46%～-0.38%, R3/R1=4.2～4.6, the additional loss of macrobending at 1550nm and 1625nm with 15mm bending radius is less than 0.03dB and 0.1dB respectively; The additional macrobending loss of 1550nm and 1625nm in 1 turn is less than 0.03dB and 0.1dB respectively; the additional loss of 1550nm and 1625nm in 7.5mm bending radius is less than 0.08dB and 0.25dB respectively; The macrobending additional loss at 1550nm and 1625nm is less than 0.15dB and 0.45dB respectively, the dispersion at 1550nm is less than or equal to 18ps/(nm·km), the dispersion at 1625nm is less than or equal to 22ps/(nm·km), and the zero dispersion slope is less than 0.092ps/(nm 2 ·km ).
采用本发明所制造的抗弯曲光纤后，其存在如下有益效果：1在芯层不通CF 4原料的前提下实现芯层F的少量掺杂，芯层GeO 2和F共掺有效降低了芯层粘度，使芯层和内包层的粘度更匹配，减少了光纤过程中产生的缺陷，光纤衰减得到改善； After adopting the bending-resistant optical fiber manufactured by the present invention, it has the following beneficial effects: 1. A small amount of doping of the core layer F can be realized under the premise that the core layer does not pass through the CF 4 raw material, and the co-doping of GeO 2 and F in the core layer can effectively reduce the core layer. Viscosity, the viscosity of the core layer and the inner cladding layer are more matched, the defects generated in the optical fiber process are reduced, and the optical fiber attenuation is improved;
2先对芯棒、掺氟套管和合成套管进行延伸，减少污染，使光纤衰减得到进一步改善；2. Extend the mandrel, fluorine-doped sleeve and synthetic sleeve first to reduce pollution and further improve optical fiber attenuation;
3设置合成材料阻隔层并合理设置阻隔层的宽度，避免外包层材料较高的 羟基含量对光纤衰减造成影响，此外，合成材料阻隔层含有少量的氯，阻隔层的设置可使光纤下陷包层到外包层的应力有一个过渡，对降低衰减有利；3. Set the synthetic material barrier layer and set the width of the barrier layer reasonably to avoid the influence of the high hydroxyl content of the outer cladding material on the attenuation of the optical fiber. In addition, the synthetic material barrier layer contains a small amount of chlorine, and the setting of the barrier layer can make the fiber sink into the cladding layer. There is a transition in the stress to the outer cladding, which is beneficial to reduce attenuation;
4合理的光纤剖面结构设计使光纤芯层受到压应力，使芯层GeO 2掺杂量进一步降低，衰减进一步降低； 4. Reasonable optical fiber profile structure design makes the fiber core layer subject to compressive stress, which further reduces the GeO 2 doping content of the core layer and further reduces the attenuation;
5合理的光纤剖面结构设计保证了光纤优异的弯曲性能和色散性能；5 Reasonable fiber section structure design ensures the excellent bending performance and dispersion performance of the fiber;
6制造方法简单，适于大规模生产。6. The manufacturing method is simple and suitable for mass production.
附图说明Description of drawings
图1为本发明的单模光纤的横截面的折射率分布的示意图。。FIG. 1 is a schematic diagram of the refractive index distribution of the cross-section of the single-mode optical fiber of the present invention. .
具体实施方式detailed description
一种抗弯曲光纤的制造方法，包含如下步骤：A method for manufacturing a bend-resistant optical fiber, comprising the following steps:
S1.通过VAD法制备松散体，松散体包含芯层和内包层，芯层通SiCl 4和GeCl 4原料，内包层通SiCl 4和CF 4原料，松散体的密度为0.24～0.26g/cm 3，内包层CF 4原料通过扩散至芯层，对芯层进行F掺杂； S1. The loose body is prepared by the VAD method. The loose body includes a core layer and an inner cladding layer. The core layer passes through SiCl 4 and GeCl 4 raw materials, and the inner cladding layer passes through SiCl 4 and CF 4 raw materials. The density of the bulk body is 0.24～0.26g/cm 3 , the CF4 material of the inner cladding layer is diffused to the core layer, and the core layer is F-doped;
S2.松散体完成沉积后转入烧结炉进行脱水和烧结，得到烧结芯棒；S2. After the loose body is deposited, it is transferred to a sintering furnace for dehydration and sintering to obtain a sintered mandrel;
S3.烧结芯棒进行延伸，得到第一延伸芯棒，第一延伸芯棒的内包层和芯层的直径比值为2.0～3.0，芯层相对折射率差值为0.29％～0.34％，内包层相对折射率差值为-0.12％～-0.04％，其中F对芯层的折射率贡献为-0.08％～-0.03％；S3. Sinter the mandrel to extend to obtain a first extended mandrel. The diameter ratio of the inner cladding layer and the core layer of the first extending mandrel is 2.0-3.0, the relative refractive index difference of the core layer is 0.29%-0.34%, and the inner cladding layer is 0.29%-0.34%. The relative refractive index difference is -0.12% to -0.04%, and the contribution of F to the refractive index of the core layer is -0.08% to -0.03%;
S4.第一延伸芯棒、掺氟套管、合成套管进行酸洗，酸洗后先将掺氟套管插入合成套管中，再将第一延伸芯棒插入掺氟套管中形成组装芯棒，其中掺氟套管的相对折射率差为-0.50％～-0.25％，合成套管以SiCl 4为原料制备，不进行其他掺杂，其相对折射率差为0.01％～0.03％； S4. The first extension mandrel, the fluorine-doped sleeve, and the synthetic sleeve are pickled. After pickling, the fluorine-doped sleeve is inserted into the synthetic sleeve, and then the first extension mandrel is inserted into the fluorine-doped sleeve to form an assembly. The mandrel, wherein the relative refractive index difference of the fluorine-doped sleeve is -0.50% to -0.25%, the synthetic sleeve is prepared from SiCl 4 without other doping, and the relative refractive index difference is 0.01% to 0.03%;
S5.对组装芯棒进行延伸，得到第二延伸芯棒，其中，掺氟套管层直径与芯层直径的比值为3.8～4.6，合成套管层直径与芯层直径比值为4.6～5.2；S5. Extend the assembled mandrel to obtain a second extended mandrel, wherein the ratio of the diameter of the fluorine-doped casing layer to the diameter of the core layer is 3.8 to 4.6, and the ratio of the diameter of the synthetic casing layer to the diameter of the core layer is 4.6 to 5.2;
S6.第二延伸芯棒、不含氯的合成石英套管进行组装得到光纤预制棒，对该光纤预制棒进行拉丝，得到低损耗弯曲不敏感光纤，其中拉丝速度为2000m/min，拉丝采用退火工艺。S6. The second extension mandrel and the chlorine-free synthetic quartz sleeve are assembled to obtain an optical fiber preform, and the optical fiber preform is drawn to obtain a low-loss bend-insensitive optical fiber, wherein the drawing speed is 2000 m/min, and the drawing adopts annealing craft.
一种抗弯曲光纤：其自中心径向而外顺次为芯层、内包层、下陷包层、阻隔层和外包层，下陷包层采用掺氟材料，阻隔层和外包层均采用合成石英材料，阻隔层材料含氯，外包层材料不含氯，芯层的相对折射率差Δ1为0.29％～0.34％，F对芯层的折射率贡献为-0.08％～-0.03％，内包层的相对折射率差Δ2为-0.12％～-0.04％，下陷包层的相对折射率差Δ3为-0.50％～-0.25％，阻隔层相对折射率差Δ4为0.01％～0.03％，各层半径满足如下关系：R1＝3.2μm～3.8μm，R2/R1＝2.0～3.0，R3/R1＝3.8～4.6，R4/R1＝4.6～5.2。A bending-resistant optical fiber: the core layer, the inner cladding layer, the sunk cladding layer, the barrier layer and the outer cladding are sequentially arranged radially outward from the center, the sag cladding layer is made of fluorine-doped material, and the barrier layer and the outer cladding are made of synthetic quartz material , the barrier layer material contains chlorine, the outer cladding material does not contain chlorine, the relative refractive index difference Δ1 of the core layer is 0.29% to 0.34%, the contribution of F to the refractive index of the core layer is -0.08% to -0.03%, and the relative refractive index difference of the inner cladding layer is -0.08% to -0.03%. The refractive index difference Δ2 is -0.12% to -0.04%, the relative refractive index difference Δ3 of the depressed cladding is -0.50% to -0.25%, the relative refractive index difference Δ4 of the barrier layer is 0.01% to 0.03%, and the radius of each layer satisfies the following Relationship: R1=3.2μm～3.8μm, R2/R1=2.0～3.0, R3/R1=3.8～4.6, R4/R1=4.6～5.2.
芯层所受到的压应力为-50Mpa～-20Mpa；The compressive stress of the core layer is -50Mpa～-20Mpa;
光纤在1550nm的衰减系数≤0.185dB/km；The attenuation coefficient of the fiber at 1550nm is less than or equal to 0.185dB/km;
光纤在1310nm的模场直径为8.2～8.8μm，成缆截止波长≤1260nm，光纤零色散波长为1300～1324nm；The mode field diameter of the fiber at 1310nm is 8.2~8.8μm, the cable cut-off wavelength is ≤1260nm, and the zero dispersion wavelength of the fiber is 1300~1324nm;
Δ3的取值为-0.34％～-0.26％，R3/R1＝3.8～4.2，该光纤15mm弯曲半径绕10圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；10mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.1dB和0.2dB；7.5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.4dB和0.8dB；零色散斜率小于0.092ps/(nm 2·km)； The value of Δ3 is -0.34%～-0.26%, R3/R1=3.8～4.2, the additional loss of macrobending at 1550nm and 1625nm with 15mm bending radius is less than 0.03dB and 0.1dB respectively; The additional macrobending losses of 1550nm and 1625nm in one turn are less than 0.1dB and 0.2dB, respectively; the additional losses of 1550nm and 1625nm with a bending radius of 7.5mm are less than 0.4dB and 0.8dB respectively; the zero dispersion slope is less than 0.092ps/ (nm 2 km);
Δ3的取值为-0.46％～-0.38％，R3/R1＝4.2～4.6，该光纤15mm弯曲半径 绕10圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；10mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；7.5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.08dB和0.25dB；5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.15dB和0.45dB，1550nm色散≤18ps/(nm·km)，1625nm色散≤22ps/(nm·km)，零色散斜率小于0.092ps/(nm 2·km)。 The value of Δ3 is -0.46%～-0.38%, R3/R1=4.2～4.6, the additional loss of macrobending at 1550nm and 1625nm with 15mm bending radius is less than 0.03dB and 0.1dB respectively; The additional macrobending loss of 1550nm and 1625nm in 1 turn is less than 0.03dB and 0.1dB respectively; the additional loss of 1550nm and 1625nm in 7.5mm bending radius is less than 0.08dB and 0.25dB respectively; The macrobending additional loss at 1550nm and 1625nm is less than 0.15dB and 0.45dB respectively, the dispersion at 1550nm is less than or equal to 18ps/(nm·km), the dispersion at 1625nm is less than or equal to 22ps/(nm·km), and the zero dispersion slope is less than 0.092ps/(nm 2 ·km ).
具体实施例一，芯层的相对折射率差Δ1为0.32％，内包层的相对折射率差Δ2为-0.067％，下陷包层的相对折射率差Δ3为-0.30％，阻隔层相对折射率差Δ4为0.02％，各层半径满足如下关系：R1＝3.7μm，R2＝8.5μm，R3＝14.5μm，R4＝17.4μm，该光纤主要指标如下，1310nm衰减系数为0.323dB/km、1550nm衰减系数为0.184dB/km、1383nm衰减系数为0.277dB/km、1310nm模场直径为8.42μm、成缆截止波长为1215nm、零色散波长为1311nm、零色散斜率为0.090ps/(nm 2·km)、1550nm色散为17.5ps/(nm·km)，1625nm色散为21.8ps/(nm·km)。 Specific embodiment 1, the relative refractive index difference Δ1 of the core layer is 0.32%, the relative refractive index difference Δ2 of the inner cladding layer is -0.067%, the relative refractive index difference Δ3 of the depressed cladding layer is -0.30%, and the relative refractive index difference of the barrier layer is -0.30%. Δ4 is 0.02%, and the radius of each layer satisfies the following relationship: R1=3.7μm, R2=8.5μm, R3=14.5μm, R4=17.4μm, the main indicators of the fiber are as follows, 1310nm attenuation coefficient is 0.323dB/km, 1550nm attenuation coefficient 0.184dB/km, 1383nm attenuation coefficient is 0.277dB/km, 1310nm mode field diameter is 8.42μm, cabling cutoff wavelength is 1215nm, zero dispersion wavelength is 1311nm, zero dispersion slope is 0.090ps/(nm 2 ·km), The dispersion at 1550nm is 17.5ps/(nm·km), and the dispersion at 1625nm is 21.8ps/(nm·km).
具体实施例二，芯层的相对折射率差Δ1为0.305％，内包层的相对折射率差Δ2为-0.042％，下陷包层的相对折射率差Δ3为-0.45％，阻隔层相对折射率差Δ4为0.03％，各层半径满足如下关系：R1＝3.5μm，R2＝9.4μm，R3＝15.8μm，R4＝17.5μm，该光纤主要指标如下，1310nm衰减系数为0.323dB/km、1550nm衰减系数为0.183dB/km、1383nm衰减系数为0.272dB/km、1310nm模场直径为8.55μm、成缆截止波长为1235nm、零色散波长为1317nm、零色散斜率为0.089ps/(nm 2·km)、1550nm色散为17.1ps/(nm·km)，1625nm色散为21.6ps/(nm·km)。 In the second embodiment, the relative refractive index difference Δ1 of the core layer is 0.305%, the relative refractive index difference Δ2 of the inner cladding layer is -0.042%, the relative refractive index difference Δ3 of the depressed cladding layer is -0.45%, and the relative refractive index difference of the barrier layer is -0.45%. Δ4 is 0.03%, and the radius of each layer satisfies the following relationship: R1=3.5μm, R2=9.4μm, R3=15.8μm, R4=17.5μm, the main indicators of the fiber are as follows, 1310nm attenuation coefficient is 0.323dB/km, 1550nm attenuation coefficient 0.183dB/km, 1383nm attenuation coefficient is 0.272dB/km, 1310nm mode field diameter is 8.55μm, cabling cutoff wavelength is 1235nm, zero dispersion wavelength is 1317nm, zero dispersion slope is 0.089ps/(nm 2 ·km), The dispersion at 1550nm is 17.1ps/(nm·km), and the dispersion at 1625nm is 21.6ps/(nm·km).
其中各层相对折射率差的定义：
Figure PCTCN2020115769-appb-000001
Δc为外包层折射率。 The definition of the relative refractive index difference of each layer is:
Figure PCTCN2020115769-appb-000001
Δc is the outer cladding refractive index.
采用本发明制造的抗弯曲光纤后，其存在如下有益效果：After adopting the anti-bending optical fiber manufactured by the present invention, it has the following beneficial effects:
1在芯层不通CF 4原料的前提下实现芯层F的少量掺杂，芯层GeO 2和F共掺有效降低了芯层粘度，使芯层和内包层的粘度更匹配，减少了光纤过程中产生的缺陷，光纤衰减得到改善； 1 Under the premise that the core layer does not pass through the CF 4 raw material, a small amount of doping of F in the core layer is realized. The co-doping of GeO 2 and F in the core layer effectively reduces the viscosity of the core layer, makes the viscosity of the core layer and the inner cladding layer more matched, and reduces the optical fiber process. The defects generated in the fiber optic attenuation are improved;
优先对芯棒、掺氟套管和合成套管进行延伸，减少污染，使光纤衰减得到进一步改善；Prioritize the extension of the mandrel, fluorine-doped sleeve and synthetic sleeve to reduce pollution and further improve optical fiber attenuation;
3设置合成材料阻隔层并合理设置阻隔层的宽度，避免外包层材料较高的羟基含量对光纤衰减造成影响，此外，合成材料阻隔层含有少量的氯，阻隔层的设置可使光纤下陷包层到外包层的应力有一个过渡，对降低衰减有利；3. Set the synthetic material barrier layer and set the width of the barrier layer reasonably to avoid the influence of the high hydroxyl content of the outer cladding material on the attenuation of the optical fiber. In addition, the synthetic material barrier layer contains a small amount of chlorine, and the setting of the barrier layer can make the fiber sink into the cladding layer. There is a transition in the stress to the outer cladding, which is beneficial to reduce attenuation;
4合理的光纤剖面结构设计使光纤芯层受到压应力，使芯层GeO 2掺杂量进一步降低，衰减进一步降低； 4. Reasonable optical fiber profile structure design makes the fiber core layer subject to compressive stress, which further reduces the GeO 2 doping content of the core layer and further reduces the attenuation;
5合理的光纤剖面结构设计保证了光纤优异的弯曲性能和色散性能；5 Reasonable fiber section structure design ensures the excellent bending performance and dispersion performance of the fiber;
6制造方法简单，适于大规模生产。6. The manufacturing method is simple and suitable for mass production.
以上实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.
以上实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形 和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above examples only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, under the premise of not departing from the inventive concept, some modifications and improvements can also be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (9)

  1. 一种抗弯曲光纤的制造方法，包含如下步骤：A method for manufacturing a bend-resistant optical fiber, comprising the following steps:
    S1.通过VAD法制备松散体，松散体包含芯层和内包层，芯层通SiCl 4和GeCl 4原料，内包层通SiCl 4和CF 4原料，松散体的密度为0.24～0.26g/cm 3，内包层CF 4原料通过扩散至芯层，对芯层进行F掺杂； S1. The loose body is prepared by the VAD method. The loose body includes a core layer and an inner cladding layer. The core layer passes through SiCl 4 and GeCl 4 raw materials, and the inner cladding layer passes through SiCl 4 and CF 4 raw materials. The density of the bulk body is 0.24～0.26g/cm 3 , the CF4 material of the inner cladding layer is diffused to the core layer, and the core layer is F-doped;
    S2.松散体完成沉积后转入烧结炉进行脱水和烧结，得到烧结芯棒；S2. After the loose body is deposited, it is transferred to a sintering furnace for dehydration and sintering to obtain a sintered mandrel;
    S3.烧结芯棒进行延伸，得到第一延伸芯棒，第一延伸芯棒的内包层和芯层的直径比值为2.0～3.0，芯层相对折射率差值为0.29％～0.34％，内包层相对折射率差值为-0.12％～-0.04％，其中F对芯层的折射率贡献为-0.08％～-0.03％；S3. Sinter the mandrel to extend to obtain a first extended mandrel. The diameter ratio of the inner cladding layer and the core layer of the first extending mandrel is 2.0-3.0, the relative refractive index difference of the core layer is 0.29%-0.34%, and the inner cladding layer is 0.29%-0.34%. The relative refractive index difference is -0.12% to -0.04%, and the contribution of F to the refractive index of the core layer is -0.08% to -0.03%;
    S4.第一延伸芯棒、掺氟套管、合成套管进行酸洗，酸洗后先将掺氟套管插入合成套管中，再将第一延伸芯棒插入掺氟套管中形成组装芯棒，其中掺氟套管的相对折射率差为-0.50％～-0.25％，合成套管以SiCl 4为原料制备，不进行其他掺杂，其相对折射率差为0.01％～0.03％； S4. The first extension mandrel, the fluorine-doped sleeve, and the synthetic sleeve are pickled. After pickling, the fluorine-doped sleeve is inserted into the synthetic sleeve, and then the first extension mandrel is inserted into the fluorine-doped sleeve to form an assembly. The mandrel, wherein the relative refractive index difference of the fluorine-doped sleeve is -0.50% to -0.25%, the synthetic sleeve is prepared from SiCl 4 without other doping, and the relative refractive index difference is 0.01% to 0.03%;
    S5.对组装芯棒进行延伸，得到第二延伸芯棒，其中，掺氟套管层直径与芯层直径的比值为3.8～4.6，合成套管层直径与芯层直径比值为4.6～5.2；S5. Extend the assembled mandrel to obtain a second extended mandrel, wherein the ratio of the diameter of the fluorine-doped casing layer to the diameter of the core layer is 3.8 to 4.6, and the ratio of the diameter of the synthetic casing layer to the diameter of the core layer is 4.6 to 5.2;
    S6.第二延伸芯棒、不含氯的合成石英套管进行组装得到光纤预制棒，对该光纤预制棒进行拉丝，得到抗弯曲光纤。S6. The second extension core rod and the chlorine-free synthetic quartz sleeve are assembled to obtain an optical fiber preform, and the optical fiber preform is drawn to obtain a bending-resistant optical fiber.
  2. 如权利要求1所述的一种抗弯曲光纤的制造方法，其特征在于：拉丝速度为2000m/min，拉丝采用退火工艺。The method for manufacturing a bending-resistant optical fiber according to claim 1, wherein the wire drawing speed is 2000 m/min, and the wire drawing adopts an annealing process.
  3. 一种抗弯曲光纤，其特征在于：其自中心径向而外顺次为芯层、内包层、下陷包层、阻隔层和外包层，所述下陷包层采用掺氟材料，所述阻隔层和外包层均采用合成石英材料，所述阻隔层材料含氯，所述外包层材料不含 氯，所述芯层的相对折射率差Δ1为0.29％～0.34％，氟对芯层的折射率贡献为-0.08％～-0.03％，内包层的相对折射率差Δ2为-0.12％～-0.04％，下陷包层的相对折射率差Δ3为-0.50％～-0.25％，阻隔层相对折射率差Δ4为0.01％～0.03％，各层半径满足如下关系：R1＝3.2μm～3.8μm，R2/R1＝2.0～3.0，R3/R1＝3.8～4.6，R4/R1＝4.6～5.2。A bending-resistant optical fiber is characterized in that: it is a core layer, an inner cladding layer, a depressed cladding layer, a barrier layer and an outer cladding layer in order from the center radially outward, the depressed cladding layer is made of fluorine-doped material, and the barrier layer The material of the barrier layer and the outer layer are made of synthetic quartz material, the material of the barrier layer contains chlorine, the material of the outer layer does not contain chlorine, the relative refractive index difference Δ1 of the core layer is 0.29% to 0.34%, and the refractive index of fluorine to the core layer is 0.29% to 0.34%. The contribution is -0.08% to -0.03%, the relative refractive index difference Δ2 of the inner cladding is -0.12% to -0.04%, the relative refractive index difference Δ3 of the depressed cladding is -0.50% to -0.25%, and the relative refractive index difference of the barrier layer is -0.12% to -0.04%. The difference Δ4 is 0.01%-0.03%, and the radius of each layer satisfies the following relationships: R1=3.2μm-3.8μm, R2/R1=2.0-3.0, R3/R1=3.8-4.6, R4/R1=4.6-5.2.
  4. 如权利要求3所述的一种抗弯曲光纤，其特征在于：所述芯层所受到的压应力为-50Mpa～-20Mpa。The bending-resistant optical fiber according to claim 3, wherein the compressive stress on the core layer is -50Mpa～-20Mpa.
  5. 如权利要求3或4所述的一种抗弯曲光纤，其特征在于：光纤在1550nm的衰减系数≤0.185dB/km。A bending-resistant optical fiber according to claim 3 or 4, characterized in that: the attenuation coefficient of the optical fiber at 1550 nm is less than or equal to 0.185 dB/km.
  6. 如权利要求3或4所述的一种抗弯曲光纤，其特征在于：光纤在1310nm的模场直径为8.2μm～8.8μm，成缆截止波长≤1260nm，光纤零色散波长为1300nm～1324nm。The bending-resistant optical fiber according to claim 3 or 4, characterized in that the mode field diameter of the optical fiber at 1310 nm is 8.2 μm-8.8 μm, the cabling cut-off wavelength is less than or equal to 1260 nm, and the zero-dispersion wavelength of the optical fiber is 1300 nm-1324 nm.
  7. 如权利要求6所述的一种抗弯曲光纤，其特征在于：零色散波长为1304nm～1324nm。The bending-resistant optical fiber according to claim 6, wherein the zero-dispersion wavelength is 1304 nm to 1324 nm.
  8. 如权利要求3或4所述的一种抗弯曲光纤，其特征在于：Δ3的取值为-0.34％～-0.26％，R3/R1＝3.8～4.2，该光纤15mm弯曲半径绕10圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；10mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.1dB和0.2dB；7.5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.4dB和0.8dB，零色散斜率小于0.092ps/(nm 2·km)。 The bending-resistant optical fiber according to claim 3 or 4, characterized in that: the value of Δ3 is -0.34%～-0.26%, R3/R1=3.8～4.2, and the 15mm bending radius of the optical fiber is 1550nm around 10 turns. and 1625nm, the additional loss of macrobending is less than 0.03dB and 0.1dB, respectively; the additional loss of 1550nm and 1625nm is less than 0.1dB and 0.2dB respectively when the 10mm bending radius is 1 turn; The additional loss of macrobend is less than 0.4dB and 0.8dB respectively, and the zero dispersion slope is less than 0.092ps/(nm 2 ·km).
  9. 如权利要求3或4所述的一种抗弯曲光纤，其特征在于：Δ3的取值为-0.46％～-0.38％，R3/R1＝4.2～4.6，该光纤15mm弯曲半径绕10圈的1550nm 和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；10mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.03dB和0.1dB；7.5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.08dB和0.25dB；5mm弯曲半径绕1圈的1550nm和1625nm的宏弯附加损耗分别小于0.15dB和0.45dB，1550nm色散≤18ps/(nm·km)，1625nm色散≤22ps/(nm·km)，零色散斜率小于0.092ps/(nm 2·km)。 The bending-resistant optical fiber according to claim 3 or 4, characterized in that: the value of Δ3 is -0.46% to -0.38%, R3/R1 = 4.2 to 4.6, and the 15mm bending radius of the optical fiber is 1550nm around 10 turns. and 1625nm, the additional loss of macrobending is less than 0.03dB and 0.1dB, respectively; the additional loss of 1550nm and 1625nm with 10mm bending radius is less than 0.03dB and 0.1dB respectively; the 1550nm and 1625nm with 7.5mm bending radius The additional loss of macrobending is less than 0.08dB and 0.25dB, respectively; the additional loss of macrobending at 1550nm and 1625nm with a bending radius of 5mm is less than 0.15dB and 0.45dB, respectively, 1550nm dispersion≤18ps/(nm·km), 1625nm dispersion≤22ps /(nm·km), the zero dispersion slope is less than 0.092ps/(nm 2 ·km).
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