WO2017173808A1 - 弯曲不敏感的耐辐照单模光纤 - Google Patents
弯曲不敏感的耐辐照单模光纤 Download PDFInfo
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- WO2017173808A1 WO2017173808A1 PCT/CN2016/102822 CN2016102822W WO2017173808A1 WO 2017173808 A1 WO2017173808 A1 WO 2017173808A1 CN 2016102822 W CN2016102822 W CN 2016102822W WO 2017173808 A1 WO2017173808 A1 WO 2017173808A1
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- 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
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- 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
-
- 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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/045—Light guides
- G02B1/046—Light guides characterised by the core material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/045—Light guides
- G02B1/048—Light guides characterised by the cladding material
-
- 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
Definitions
- the present invention relates to the field of single mode fibers, and in particular to a radiation insensitive single mode fiber that is insensitive to bending.
- the existing radiation-resistant optical fibers are mainly classified into three types, namely, a multi-mode fiber of 50 micrometer core diameter, a multimode fiber of 62.5 micrometer core diameter, and a single mode fiber.
- the existing waveguide structure of the radiation-resistant single-mode fiber does not have the bending resistance and cannot be applied under a very small bending radius, for example, in a small optical device. Therefore, the existing radiation-resistant single-mode fiber is greatly restricted in practical applications, and improving the bending resistance of the radiation-resistant fiber is a development trend of the radiation-resistant single-mode fiber.
- the object of the present invention is to overcome the deficiencies of the above background art and to provide a radiation-insensitive radiation-resistant single-mode optical fiber, which is attached in a bent state compared with the existing radiation-resistant single-mode optical fiber.
- the loss is greatly reduced, the bending resistance is strong, that is, it is not sensitive to bending; at the same time, the single-mode fiber has strong radiation resistance.
- the invention provides a radiation-insensitive radiation-resistant single-mode optical fiber, which comprises a core layer, an inner cladding layer and an outer cladding layer arranged in order from the inside to the outside, and the core layer, the inner cladding layer and the outer cladding layer.
- the inner cladding comprises a first fluorine-doped inner cladding layer arranged from the inside to the outside, and a second fluorine-doped inner cladding layer, the core layer and the first fluorine-doped inner cladding layer are not doped with germanium elements, and other metals
- the impurity and the phosphorus element concentration are all less than 0.1 ppm; in the mass percentage, the fluorine element content in the core layer is 0-0.45%, the chlorine element content is 0.01%-0.10%; the fluorine in the first fluorine-doped inner cladding layer
- the element concentration is 1.00% to 1.55%, and the fluorine element concentration in the second fluorine-doped inner cladding layer is 3.03% to 5.00%.
- the maximum value ⁇ 1 max of the relative refractive index difference between the core layer and the first fluorine-doped inner cladding layer is 0.13% to 0.30%; the first fluorine-doped inner cladding layer and the second fluorine-doped inner layer
- the maximum value of the relative refractive index difference of the inner cladding layer is ⁇ 2 max of 0.40% to 0.96%, the refractive index of the second fluorine-doped inner cladding layer is smaller than the refractive index of the first fluorine-doped inner cladding layer, and the second fluorine-doped inner cladding layer is outsourced.
- the maximum value of the relative refractive index difference of the layer ⁇ 3 max is -0.28% to -1.09%.
- the maximum value ⁇ 1 max of the relative refractive index difference between the core layer and the first fluorine-doped inner cladding layer is 0.30%; the first fluorine-doped inner cladding layer is opposite to the second fluorine-doped inner cladding layer.
- the maximum value of the refractive index difference ⁇ 2 max is -0.61%
- the maximum value ⁇ 3 max of the maximum value of the relative refractive index difference between the second fluorine-doped inner cladding layer and the outer cladding layer is -0.91%.
- the single mode fiber has an attenuation coefficient of 0.322 dB/km at a wavelength of 1310 nm, an attenuation coefficient of 0.185 dB/km at a wavelength of 1550 nm, and an attenuation coefficient of 0.186 dB/km at a wavelength of 1625 nm. .
- the single mode fiber has a bending loss at a wavelength of 1550 nm of 0.11 dB and a bending loss of 0.21 dB at a wavelength of 1625 nm when it is wound one turn at a bending diameter of 10 mm.
- the radius R1 of the core layer is 3.9-4.3 ⁇ m
- the radius R2 of the first fluorine-doped inner cladding layer is 5-34 ⁇ m
- the radius R3 of the second fluorine-doped inner cladding layer is 22 ⁇ 48 ⁇ m.
- the radius R1 of the core layer is 4 ⁇ m;
- the radius R2 of the fluorine-doped inner cladding is 30 ⁇ m, and the radius R3 of the second fluorine-doped inner cladding is 46 ⁇ m.
- the irradiation additional loss of the single mode fiber at the wavelength of 1310 nm is less than 14.8 dB/km.
- the single-mode optical fiber is coated with a fiber coating layer, and the fiber coating layer is made of one or two kinds of high temperature resistant acrylic resin, silicone rubber, polyimide, carbon or metal. to make.
- the present invention introduces a fluorine-doped double-clad structure with a refractive index recessed around the core layer of the optical fiber, which can adjust the power distribution and limiting capability of the optical electromagnetic field, and the power of the high-order mode can pass the refractive index of the fluorine-doped double-clad structure.
- the channel leaks rapidly, which can greatly reduce the additional loss of the fiber under bending state.
- the fiber has strong bending resistance, that is, the fiber is not sensitive to bending, thereby expanding the application environment of the fiber.
- the fluorine-doped double-clad structure can absorb part of the radiation before the radiation line passes through the fluorine-doped double-clad structure of the present invention, thereby reducing structural defects caused by radiation of the core layer and improving the radiation resistance of the optical fiber. ability.
- the existing fiber core layers are doped with antimony element, which causes Rayleigh scattering loss of the core material, and the attenuation coefficient of the fiber is high; the present invention does not dope the core layer, which greatly reduces the Rayleigh scattering loss can ensure that the fiber has a lower attenuation coefficient in the 1310nm window, lowering the attenuation of the fiber, and lowering the transmission loss.
- the absence of antimony in the core layer can also reduce the sensitivity of the fiber to irradiation.
- the invention also controls the content of other metal impurities and phosphorus elements in the core layer and the cladding layer, and is doped with a certain amount of fluorine element in proportion to further reduce the radiation damage of the optical fiber.
- FIG. 1 is a schematic cross-sectional view showing a radiation-insensitive radiation-resistant single-mode optical fiber in an embodiment of the present invention
- FIG. 2 is a schematic cross-sectional view showing the refractive index of a radiation-insensitive radiation-resistant single-mode optical fiber in an embodiment of the present invention.
- an embodiment of the present invention provides a radiation-insensitive radiation-resistant single-mode optical fiber, including a core layer 1 , an inner cladding layer, an outer cladding layer 4 , a core layer 1 , an inner cladding layer, and an inner cladding layer, which are arranged in order from the inside to the outside.
- the material of the outer cladding layer 4 is quartz, wherein the inner cladding layer comprises a first fluorine-doped inner cladding layer 2 and a second fluorine-doped inner cladding layer 3 arranged from the inside to the outside, and the core layer 1 and the first fluorine-doped inner cladding layer 2 are not doped.
- Heterochrome element instrument analysis of cerium element concentration, less than 1ppm
- other metal impurities and phosphorus element concentration are less than 0.1ppm
- core layer 1 is doped with fluorine content of 0-0.45%, chlorine
- the element content is 0.01% to 0.10%
- the fluorine element concentration in the first fluorine-doped inner cladding layer 2 is 1.00% to 1.55%
- the fluorine element concentration in the second fluorine-doped inner cladding layer 3 is 3.03% to 5.00%.
- the core layer 1 is located at the center of the cross section of the optical fiber and is the main light guiding area of the optical fiber.
- the first fluorine-doped inner cladding layer 2 and the second fluorine-doped inner cladding layer 3 are sequentially coated on the outer side of the core layer 1 .
- An annular region doped with fluorine in the cross section of the optical fiber; the outer cladding 4 is coated on the outer side of the second fluorine-doped inner cladding 3.
- the radius R1 of the core layer 1 is 3.9 to 4.3 ⁇ m
- the radius R2 of the first fluorine-doped inner cladding layer 2 is 5 to 34 ⁇ m
- the radius R3 of the second fluorine-doped inner cladding layer 3 is 22 to 48 ⁇ m
- the radius R4 of the outer cladding layer 4 is 60.5. ⁇ 64.5 ⁇ m.
- the maximum value of the relative refractive index difference between the core layer 1 and the first fluorine-doped inner cladding layer ⁇ 1 max is 0.13% to 0.30%; the relative refractive index difference between the first fluorine-doped inner cladding layer 2 and the second fluorine-doped inner cladding layer 3
- the maximum value ⁇ 2 max is 0.40% to 0.96%.
- the refractive index of the second fluorine-doped inner cladding layer 3 is smaller than the refractive index of the first fluorine-doped inner cladding layer 2; the second fluorine-doped inner cladding layer 3 and the outer cladding layer
- the maximum value of the relative refractive index difference of ⁇ 3 max is -0.28% to -1.09%.
- the single-mode optical fiber is further coated with a fiber coating layer, and the fiber coating layer is made of one or two kinds of high temperature resistant acrylic resin, silicone rubber, polyimide, carbon or metal. Different coating materials enable the fiber to adapt to different ambient temperatures.
- the fiber coating layer is made of ultraviolet curing silicone rubber or high temperature resistant acrylic resin, the thickness of one side is 60 ⁇ 5 ⁇ m, and the operating temperature of the single mode fiber is -40 ° C to 150 ° C.
- the fiber coating layer is made of heat-curing silicone rubber, the thickness of one side is 20 ⁇ 4 ⁇ m, and the operating temperature of the single-mode fiber is -50 ° C to 150 ° C.
- the thickness of one side is 15 ⁇ 3 ⁇ m, and the operating temperature of the single mode fiber is -50 ° C to 400 ° C.
- the thickness of one side is 15 ⁇ 3 ⁇ m, and the operating temperature of the single mode fiber is -50 ° C to 350 ° C.
- the fiber coating layer is made of metal, the thickness of one side is 15 ⁇ 3 ⁇ m, and the operating temperature of the single mode fiber is -200°C ⁇ 700°C; the metal used is gold, silver, copper, aluminum or any two of them. An alloy of metals.
- the detection method used in the embodiment of the present invention is to irradiate the optical fiber at a dose rate of 0.45 Gy/s using a cobalt-60 radiation source at a temperature of about 24 ° C, and the total dose is 2000 kGy.
- a source of wavelength 1310 nm is used to measure the attenuation of the fiber caused by radiation. More details on the equipment and test procedures for plotting the post-radiation decay delta data in Table 1 can be found in the following publications: Jochen Kuhnhenn, Stefan Klaus and Udo Weinand, Quality Assurance for Irradiation Tests of Optical Fibers: Uncertainty and Reproducibility, IEEE Transactions on Nuclear Science, Vol. 56, No. 4, August 2009, at 2160-2166.
- the attenuation coefficient of the bend-insensitive radiation-resistant single-mode fiber provided by the present invention is greatly reduced compared with the conventional radiation-resistant single-mode fiber, and the bending loss is also greatly optimized.
- the layer material ensures that the fiber has good radiation resistance and high temperature resistance.
- the gamma irradiation dose is 2000 kGy
- the single mode fiber has an additional radiation loss of less than 14.8 dB/km at a wavelength of 1310 nm.
- the bending loss at a wavelength of 1550 nm is 0.11 to 0.31 dB
- the bending loss at a wavelength of 1625 nm is 0.21 to 0.42 dB.
- the bending loss at a wavelength of 1550 nm is at least 0.08 dB
- the bending loss at a wavelength of 1625 nm is at least 0.25 dB.
- Embodiment 6 The percentage of fluorine element doped in the single-mode optical fiber core layer in Example 6 is 0.3%, the chlorine element content is 0.1%, and the fluorine element concentration in the first fluorine-doped inner cladding layer is 1.55%, second. The fluorine element concentration in the fluorine-doped inner cladding was 4.09%.
- the radius R1 of the single-mode optical fiber core layer is 4 ⁇ m
- the radius R2 of the first fluorine-doped inner cladding layer is 30 ⁇ m
- the radius R3 of the second fluorine-doped inner cladding layer is 46 ⁇ m
- the relative refractive index difference between the core layer and the first fluorine-doped inner cladding layer The maximum value ⁇ 1 max is 0.30%
- the maximum value of the relative refractive index difference between the first fluorine-doped inner cladding layer and the second fluorine-doped inner cladding layer is ⁇ 2 max is -0.61%
- the second fluorine-doped inner cladding layer and the outer cladding layer 4 are relatively refracted.
- the maximum value of the rate difference ⁇ 3 max was -0.91%.
- the bending loss at a wavelength of 1550 nm is 0.11 dB, and the bending loss at a wavelength of 1625 nm is 0.21 dB;
- the attenuation coefficient of the single-mode fiber at a wavelength of 1310 nm is 0.322. dB/km, the attenuation coefficient at a wavelength of 1550 nm is 0.185 dB/km, and the attenuation coefficient at a wavelength of 1625 nm is 0.186 dB/km.
- n i is the refractive index in the core or cladding 1300nm wavelength
- n 0 is the refractive index of the outer cladding adjacent 1300nm wavelength.
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- 一种弯曲不敏感的耐辐照单模光纤,包括由内至外依次排列的芯层(1)、内包层、外包层(4),所述芯层(1)、内包层、外包层(4)的材质均为石英,其特征在于:所述内包层包括由内至外排列的第一掺氟内包层(2)、第二掺氟内包层(3),所述芯层(1)和第一掺氟内包层(2)均不掺杂锗元素,其他金属杂质以及磷元素浓度均低于0.1ppm;以质量百分比计,芯层(1)中掺杂的氟元素含量为0~0.45%,氯元素含量为0.01%~0.10%;第一掺氟内包层(2)中的氟元素浓度为1.00%~1.55%,第二掺氟内包层(3)中的氟元素浓度为3.03%~5.00%。
- 如权利要求1所述的弯曲不敏感的耐辐照单模光纤,其特征在于:所述芯层(1)与第一掺氟内包层(2)的相对折射率差的最大值△1max为0.13%~0.30%;所述第一掺氟内包层(2)与第二掺氟内包层(3)的相对折射率差的最大值△2max为0.40%~0.96%,第二掺氟内包层(3)的折射率小于第一掺氟内包层(2)的折射率;所述第二掺氟内包层(3)与外包层(4)的相对折射率差的最大值△3max为-0.28%~-1.09%。
- 如权利要求2所述的弯曲不敏感的耐辐照单模光纤,其特征在于:所述芯层(1)与第一掺氟内包层(2)的相对折射率差的最大值△1max为0.30%;所述第一掺氟内包层(2)与第二掺氟内包层(3)相对折射率差的最大值△2max为-0.61%,第二掺氟内包层(3)与外包层相对折射率差最大值的最大值△3max为-0.91%。
- 如权利要求3所述的弯曲不敏感的耐辐照单模光纤,其特征在于:该单模光纤在1310nm波长处的衰减系数为0.322dB/km,在1550nm波长处的衰减系数为0.185dB/km,在1625nm波长处的衰减 系数为0.186dB/km。
- 如权利要求3所述的弯曲不敏感的耐辐照单模光纤,其特征在于:该单模光纤在10mm弯曲直径下卷绕一圈时,在1550nm波长处的弯曲损耗为0.11dB,在1625nm波长处的弯曲损耗为0.21dB。
- 如权利要求1所述的弯曲不敏感的耐辐照单模光纤,其特征在于:所述芯层(1)的半径R1为3.9~4.3μm,所述第一掺氟内包层(2)的半径R2为5~34μm,所述第二掺氟内包层(3)的半径R3为22~48μm。
- 如权利要求6所述的弯曲不敏感的耐辐照单模光纤,其特征在于:所述芯层(1)的半径R1为4μm;第一掺氟内包层(2)的半径R2为30μm,第二掺氟内包层(3)的半径R3为46μm。
- 如权利要求1所述的弯曲不敏感的耐辐照单模光纤,其特征在于:伽马辐照剂量为2000kGy时,该单模光纤在1310nm波长处的辐照附加损耗小于14.8dB/km。
- 如权利要求1所述的弯曲不敏感的耐辐照单模光纤,其特征在于:该单模光纤外包覆有光纤涂覆层,光纤涂覆层采用耐高温的丙烯酸树脂、硅橡胶、聚酰亚胺、碳或金属中的1~2种制成。
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KR1020187015600A KR20180102061A (ko) | 2016-04-06 | 2016-10-21 | 구부림 강화 방사 저항 단일 모드 광섬유(bending-insensitive, radiation-resistant single-mode optical fiber) |
EP16897740.3A EP3441806B1 (en) | 2016-04-06 | 2016-10-21 | Bending-insensitive, radiation-resistant single-mode optical fiber |
US15/766,837 US10295737B2 (en) | 2016-04-06 | 2016-10-21 | Bending-insensitive, radiation-resistant single-mode optical fiber |
ES16897740T ES2907628T3 (es) | 2016-04-06 | 2016-10-21 | Fibra óptica monomodo no sensible a la flexión y resistente a la radiación |
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US9678269B2 (en) | 2014-05-16 | 2017-06-13 | Corning Incorporated | Multimode optical fiber transmission system including single mode fiber |
CN105676349B (zh) * | 2016-04-06 | 2017-11-07 | 武汉邮电科学研究院 | 弯曲不敏感的耐辐照单模光纤 |
CN106154410A (zh) * | 2016-08-30 | 2016-11-23 | 烽火通信科技股份有限公司 | 一种单模光纤及其制造方法 |
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CN110133796A (zh) * | 2019-04-11 | 2019-08-16 | 山东太平洋光纤光缆有限公司 | 一种耐辐照光纤及其制备方法 |
CN112824943B (zh) * | 2019-11-20 | 2022-07-15 | 烽火通信科技股份有限公司 | 一种辐射不敏感单模光纤 |
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KR20220124408A (ko) | 2021-03-03 | 2022-09-14 | 한국원자력연구원 | 광섬유의 내방사선 특성 향상 장치 |
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WO2024048118A1 (ja) * | 2022-09-02 | 2024-03-07 | 住友電気工業株式会社 | 光ファイバ |
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US10295737B2 (en) | 2019-05-21 |
EP3441806A4 (en) | 2020-01-15 |
ES2907628T3 (es) | 2022-04-25 |
KR20180102061A (ko) | 2018-09-14 |
EP3441806A1 (en) | 2019-02-13 |
EP3441806B1 (en) | 2021-11-17 |
CN105676349B (zh) | 2017-11-07 |
CN105676349A (zh) | 2016-06-15 |
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