WO2024172072A1 - 光ファイバの製造方法および光ケーブルの製造方法 - Google Patents

光ファイバの製造方法および光ケーブルの製造方法 Download PDF

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Publication number
WO2024172072A1
WO2024172072A1 PCT/JP2024/005022 JP2024005022W WO2024172072A1 WO 2024172072 A1 WO2024172072 A1 WO 2024172072A1 JP 2024005022 W JP2024005022 W JP 2024005022W WO 2024172072 A1 WO2024172072 A1 WO 2024172072A1
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Prior art keywords
optical
optical fiber
resin layer
less
diameter
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Ceased
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PCT/JP2024/005022
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English (en)
French (fr)
Japanese (ja)
Inventor
巌 岡崎
一之 相馬
卓弘 野村
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to JP2025501179A priority Critical patent/JPWO2024172072A1/ja
Priority to EP24756913.0A priority patent/EP4667432A1/en
Priority to CN202480012316.4A priority patent/CN120677132A/zh
Publication of WO2024172072A1 publication Critical patent/WO2024172072A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/104—Coating to obtain optical fibres
    • C03C25/1065—Multiple coatings
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables

Definitions

  • the present disclosure relates to a method for manufacturing an optical fiber and a method for manufacturing an optical cable.
  • This application claims priority based on Japanese Application No. 2023-022232 filed on February 16, 2023 and Japanese Application No. 2023-141381 filed on August 31, 2023, and incorporates all of the contents of the above-mentioned Japanese applications.
  • Patent document 1 describes an optical fiber in which the outer diameter of the cladding is 70 ⁇ m or more and 120 ⁇ m or less.
  • a manufacturing method of an optical fiber according to the present disclosure is a manufacturing method of an optical fiber for use in an optical cable, the optical fiber having a glass fiber with a diameter of 125 ⁇ m or less, a primary resin layer surrounding the glass fiber, and a secondary resin layer surrounding the primary resin layer and having a diameter of 150 ⁇ m or more and 210 ⁇ m or less, the manufacturing method including the steps of determining, for a reference optical fiber, a lateral rigidity D0, a bending rigidity H0, a transmission loss ⁇ 1 at a wavelength of 1.55 ⁇ m before being mounted in an optical cable, and a transmission loss ⁇ 2 at a wavelength of 1.55 ⁇ m when mounted in an optical cable, and determining, for the optical fiber, a diameter of the glass fiber Dg [ ⁇ m], a radius of the glass fiber R0 [m], a Young's modulus of the glass fiber E0 [N/m 2 ], a radius of the primary resin layer R1 [m], a Young's modulus of the primary resin
  • c1 0.209367
  • c2 1.206659
  • c3 0.401169
  • c 010 0.253128
  • c 001 -7.130445
  • c200 0.787599
  • 110 0.329243
  • c 101 2.320080
  • c 020 -0.062024
  • FIG. 1 is a cross-sectional view perpendicular to the fiber axis of an optical fiber manufactured by a manufacturing method for an optical fiber according to an embodiment.
  • FIG. 2 is a graph showing the relationship between the cladding diameter and the transmission loss.
  • the present disclosure aims to provide a method for manufacturing optical fiber and an optical cable that can suppress an increase in microbending loss even when the density is increased.
  • a manufacturing method of an optical fiber according to one aspect of the present disclosure is a manufacturing method of an optical fiber for use in an optical cable, the optical fiber having a glass fiber with a diameter of 125 ⁇ m or less, a primary resin layer surrounding the glass fiber, and a secondary resin layer surrounding the primary resin layer and having a diameter of 150 ⁇ m or more and 210 ⁇ m or less, the manufacturing method including the steps of determining, for a reference optical fiber, a lateral rigidity D0, a bending rigidity H0, a transmission loss ⁇ 1 at a wavelength of 1.55 ⁇ m before being mounted in an optical cable, and a transmission loss ⁇ 2 at a wavelength of 1.55 ⁇ m when mounted in an optical cable, and determining, for the optical fiber, a diameter of the glass fiber Dg [ ⁇ m], a radius of the glass fiber R0 [m], a Young's modulus of the glass fiber E0 [N/m
  • an optical fiber can be manufactured that can suppress an increase in microbending loss even when it is highly dense.
  • the diameter of the optical fiber By reducing the diameter of the optical fiber, the number of optical fibers mounted in the optical cable can be increased. Even an optical cable with the same diameter as a conventional optical cable can contain more optical fibers and transmit a larger amount of information. In addition, less material is used and it is more economical than conventional optical cables with the same number of cores.
  • the diameter of the glass fiber may be less than 125 ⁇ m, and in the setting process, a range of Dg less than 125 ⁇ m that satisfies formula (3) may be set.
  • the diameter of the glass fiber may be 120 ⁇ m or less, and in the setting process, a range of Dg may be set that is 120 ⁇ m or less and satisfies formula (3).
  • the Young's modulus of the glass fiber may be 70 GPa or more and 80 GPa or less.
  • a method for manufacturing an optical cable according to one aspect of the present disclosure manufactures an optical cable including a plurality of optical fibers described in any one of (1) to (5) above.
  • the optical cable includes the optical fiber, it is possible to manufacture an optical cable that can suppress an increase in microbending loss even when the optical cable is highly dense.
  • the optical cable may further include an outer jacket, the diameter of which is 3.8 mm or less, and the outer jacket may surround all of the optical fibers. In this case, a small-diameter optical cable can be manufactured.
  • the core density calculated by dividing the number of optical fibers included in the optical cable by the cross-sectional area calculated from the diameter of the jacket may be set to 4.4 fibers/ mm2 or more.
  • a high-density optical cable can be manufactured.
  • a cable that can transmit an optical signal with a sufficient amount of information even with a small diameter can be manufactured.
  • the number of optical fibers included in the optical cable may be 50 or more. In this case, a high-density optical cable can be manufactured.
  • FIG. 1 is a cross-sectional view perpendicular to the fiber axis of an optical fiber manufactured by the optical fiber manufacturing method according to the embodiment.
  • the optical fiber 1 includes a glass fiber 10 and a coating resin 20.
  • the optical fiber 1 is used in an optical cable.
  • the glass fiber 10 is made of quartz glass.
  • the glass fiber 10 includes a core 11 and a clad 12.
  • the core 11 extends along the fiber axis of the optical fiber 1.
  • the diameter (core diameter) of the core 11 is, for example, 9 ⁇ m or more and 14 ⁇ m or less.
  • the refractive index of the core 11 is higher than the refractive index of the clad 12.
  • the relative refractive index difference of the core 11 with respect to the clad 12 is, for example, 0.3% or more and 0.5% or less. In this embodiment, the microbending loss is suppressed, so that the relative refractive index difference of the core 11 can be reduced.
  • the core 11 is made of, for example, germanium-doped silica glass or pure silica glass.
  • pure silica glass is silica glass that does not substantially contain impurities.
  • the cladding 12 surrounds the core 11 and covers the outer peripheral surface of the core 11.
  • the cladding 12 is made of pure silica glass or silica glass doped with fluorine.
  • the diameter of the cladding 12 is the diameter of the glass fiber 10 (glass diameter).
  • the glass diameter is, for example, 75 ⁇ m or more and 125 ⁇ m or less.
  • the glass diameter may be, for example, 75 ⁇ m or more and less than 125 ⁇ m.
  • the glass diameter may be 75 ⁇ m or more and 120 ⁇ m or less.
  • the Young's modulus of the glass fiber 10 is, for example, 70 GPa or more and 80 GPa or less.
  • the cladding 12 may be provided with a trench. The trench can further suppress microbending loss.
  • the coating resin 20 is composed of an ultraviolet curable resin.
  • the coating resin 20 includes a primary resin layer 21 and a secondary resin layer 22.
  • the primary resin layer 21 surrounds the glass fiber 10 (clad 12) and covers the outer peripheral surface of the glass fiber 10.
  • the primary resin layer 21 is provided in contact with the glass fiber 10.
  • the thickness of the primary resin layer 21 is, for example, 2 ⁇ m or more and 20 ⁇ m or less.
  • the Young's modulus of the primary resin layer 21 is, for example, 0.05 MPa or more and 0.7 MPa or less. In order to suppress microbending loss, the lower the Young's modulus of the primary resin layer 21, the better. If the Young's modulus of the primary resin layer 21 exceeds 0.8 MPa, microbending loss cannot be sufficiently suppressed. If the Young's modulus of the primary resin layer 21 is too low, the coating resin 20 may be damaged. By making the Young's modulus of the primary resin layer 21 0.05 MPa or more, damage to the coating resin 20 is suppressed.
  • the primary resin layer 21 may be made of, for example, a polyether-based or polyester-based urethane acrylate.
  • the primary resin layer 21 may contain a reactive diluent monomer and a photoinitiator as necessary.
  • the Young's modulus of the primary resin layer 21 is adjusted, for example, by the molecular weight of the polyether portion of the ultraviolet-curable resin and the type of diluent monomer.
  • the primary resin layer 21 contains, for example, 0.3% by mass or more and 2.0% by mass or less of a phosphorus-containing photoinitiator.
  • the primary resin layer 21 contains, for example, polypropylene glycol with a mass average molecular weight of 1000 or more and 5000 or less.
  • the secondary resin layer 22 surrounds the primary resin layer 21 and covers the outer peripheral surface of the primary resin layer 21.
  • the diameter of the secondary resin layer 22 is, for example, 150 ⁇ m or more and 210 ⁇ m or less, and may be 150 ⁇ m or more and less than 180 ⁇ m, or may be 150 ⁇ m or more and 165 ⁇ m or less.
  • the diameter of the secondary resin layer 22 is the diameter (coating diameter) of the coating resin 20.
  • the thickness of the secondary resin layer 22 is, for example, 5 ⁇ m or more.
  • the Young's modulus of the secondary resin layer 22 is, for example, 1000 MPa or more and 3000 MPa or less.
  • the secondary resin layer 22 may be made of, for example, a polyether-based or polyester-based urethane acrylate.
  • the secondary resin layer 22 may contain a reactive diluent monomer and a photoinitiator as necessary.
  • the Young's modulus of the secondary resin layer 22 is adjusted, for example, by the molecular weight of the polyether portion of the ultraviolet-curable resin and the type of diluent monomer. It is preferable that the optical fiber 1 is colored for identification purposes.
  • the secondary resin layer 22 may be colored by including a pigment or dye, or a colored layer several ⁇ m thick may be provided on the secondary resin layer 22.
  • the optical cable manufactured by the optical cable manufacturing method according to the present embodiment is manufactured using an optical fiber 1.
  • the optical cable includes a plurality of optical fibers 1 and an outer jacket surrounding the plurality of optical fibers 1.
  • the diameter of the outer jacket is, for example, 3.8 mm or less.
  • the core density calculated by dividing the number of optical fibers 1 mounted in the optical cable by the cross-sectional area calculated from the diameter of the outer jacket is, for example, 4.4 pieces/ mm2 or more.
  • the number of optical fibers 1 mounted in the optical cable is, for example, 50 pieces or more, and may be 96 pieces or more. Table 1 shows examples of optical cables according to the present embodiment.
  • the transmission loss at a wavelength of 1.55 ⁇ m of the optical fibers included in each cable was 0.23 dB/km to 0.25 dB/km.
  • the optical cable may be called an optical cord as long as it contains a plurality of optical fibers 1 in the outer jacket.
  • Non-Patent Document 1 describes that the microbending resistance characteristics of an optical fiber are related to the lateral rigidity D and bending rigidity H of the optical fiber, and can be found by an approximate formula.
  • Patent Document 2 describes that the approximate formula of Non-Patent Document 1 has been expanded to a form closer to the actual situation.
  • the approximate formula of Patent Document 2 was calculated by a numerical analysis that limited the glass diameter to 125 ⁇ m. For this reason, when applied to optical fibers with different glass diameters, the deviation between the calculated microbending loss value and the actual measured value may become large. In particular, with thin-diameter optical fibers, the microbending loss calculated by the approximate formula of Patent Document 2 is lower than the actual value.
  • the following describes an approximation that extends to the range where the glass diameter is less than 125 ⁇ m or the coating diameter is less than 160 ⁇ m.
  • the lateral rigidity D of the optical fiber is expressed by equation (1) and the bending rigidity H is expressed by equation (2).
  • c1 0.209367
  • c2 1.206659
  • c3 0.401169
  • c 010 0.253128
  • c 001 -7.130445
  • c200 0.787599
  • 110 0.329243
  • c 101 2.320080
  • c 020 -0.062024
  • c 011 -0.985974
  • c 002 -8.696048
  • microbending loss ⁇ of an optical fiber is expressed by an approximation formula (5) using lateral rigidity D, bending rigidity H, and a constant A resulting from the optical characteristics of the optical fiber.
  • D/H 2 is the sensitivity that indicates how much the transmission loss increases due to a force applied from the side.
  • D 2F ⁇ R2/uy *
  • F is the lateral pressure (1 MPa)
  • ⁇ is the stress application angle (0 to 9 degrees)
  • uy * is the displacement of the pressurized portion in each structure.
  • equation (1) is obtained.
  • the inventors have used formulas (1) and (2) to derive an analytical formula for predicting the transmission loss ⁇ , including the microbending loss ⁇ , that occurs when an optical fiber with a glass diameter of 125 ⁇ m or less is cabled.
  • This analytical formula estimates the transmission loss ⁇ at a wavelength of 1.55 ⁇ m of the optical fiber to be predicted from a comparison with a reference optical fiber whose lateral rigidity, bending rigidity, transmission loss at a wavelength of 1.55 ⁇ m before being mounted in an optical cable, and transmission loss at a wavelength of 1.55 ⁇ m when mounted in an optical cable are known.
  • the lateral rigidity and bending rigidity being known includes the case where the radius (or diameter) and Young's modulus are known for the glass fiber, primary resin layer, and secondary resin layer, respectively, and the lateral rigidity and bending rigidity can be calculated from formulas (1) and (2).
  • the analytical formula can be expressed as follows.
  • Figure 2 is a graph showing the relationship between cladding diameter and transmission loss.
  • the horizontal axis of Figure 2 shows the cladding diameter Dg of the optical fiber to be predicted, and the vertical axis shows the transmission loss ⁇ at a wavelength of 1.55 ⁇ m.
  • Figure 2 graphs the analytical formula using an optical fiber as the reference optical fiber, with a glass fiber diameter of 125 ⁇ m, a primary resin layer diameter of 135 ⁇ m, a secondary resin layer diameter of 155 ⁇ m, a glass fiber Young's modulus of 72,500 MPa, a primary resin layer Young's modulus of 0.4 MPa, and a secondary resin layer Young's modulus of 1,500 MPa.
  • the cladding diameter (2R0) is 75 ⁇ m or more and 125 ⁇ m or less
  • the primary diameter (2R1) is 79 ⁇ m or more and 164 ⁇ m or less
  • the secondary diameter (2R2) is 89 ⁇ m or more and 210 ⁇ m or less.
  • the transmission loss ⁇ 2 of the reference optical fiber after cabled is shown to be 0.205 dB/km, 0.21 dB/km, and 0.23 dB/km.
  • the transmission loss of the reference optical fiber before cabled is, for example, the average transmission loss of the reference optical fiber wound on a 50 km bobbin.
  • ⁇ 1 may be the average transmission loss measured at multiple different points in the longitudinal direction of the reference optical fiber. In this example, ⁇ 1 was 0.2 dB/km.
  • the transmission loss ⁇ needs to be set to 0.3 dB/km or less, which is equivalent to that of currently mainstream optical cables using optical fibers with an outer diameter of 250 ⁇ m.
  • the optical fiber 1 in which Dg is set within a range that satisfies the following formula (3) the increase in microbending loss is suppressed.
  • the cladding diameter must be 93 ⁇ m or more to keep the transmission loss ⁇ at a wavelength of 1.55 ⁇ m to 0.3 dB/km or less.
  • the transmission loss ( ⁇ 2) of the optical fiber can be changed by changing the Young's modulus after curing of the resin used in the coating layers of the optical fiber (primary resin layer and secondary resin layer) and the thickness of each layer. As a result, a specific curve such as that shown in Figure 2 is obtained. From these curves, it is possible to predict how small an optical fiber can be obtained while achieving the desired transmission loss, and then manufacture the optical fiber.
  • the lower limit of the transmission loss ⁇ is, for example, 0.18 dB/km. That is, Dg is set so as to satisfy the following formula (4) in addition to formula (3).
  • the method for manufacturing an optical fiber and an optical cable according to this embodiment will be described.
  • the method for manufacturing an optical fiber is a method for manufacturing an optical fiber 1, and includes the steps of determining the lateral stiffness D0, bending stiffness H0, transmission loss ⁇ 1, and transmission loss ⁇ 2 for a reference optical fiber.
  • the lateral stiffness D0 is determined from equation (1).
  • the bending stiffness H0 is determined from equation (2).
  • the transmission loss ⁇ 1 and transmission loss ⁇ 2 are determined by actual measurement.
  • the method for manufacturing an optical fiber further includes a step of setting the range of cladding diameter Dg of glass fiber 10 for optical fiber 1 that is 125 ⁇ m or less and satisfies formula (3).
  • a range of cladding diameter Dg that satisfies formulas (3) and (4) may be set.
  • the method for manufacturing an optical cable includes a step of forming a jacket having a diameter of, for example, 3.8 mm or less on a plurality of optical fibers 1.
  • the method for manufacturing an optical cable is performed, for example, so that the core density calculated by dividing the number of optical fibers included in the optical cable by the cross-sectional area calculated from the diameter of the jacket is 4.4 fibers/ mm2 or more.
  • the method for manufacturing an optical cable is performed, for example, so that the number of optical fibers 1 included in the optical cable is 50 or more. Since the optical cable includes optical fibers 1, the method for manufacturing an optical cable can manufacture an optical cable that can suppress an increase in microbending loss even when the optical cable is highly dense.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Manufacturing & Machinery (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
PCT/JP2024/005022 2023-02-16 2024-02-14 光ファイバの製造方法および光ケーブルの製造方法 Ceased WO2024172072A1 (ja)

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EP24756913.0A EP4667432A1 (en) 2023-02-16 2024-02-14 Method for producing optical fiber and method for producing optical cable
CN202480012316.4A CN120677132A (zh) 2023-02-16 2024-02-14 光纤的制造方法及光缆的制造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026023588A1 (ja) * 2024-07-26 2026-01-29 住友電気工業株式会社 光ファイバおよび光ケーブル

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JP2006065006A (ja) * 2004-08-27 2006-03-09 Fujikura Ltd 光ファイバ心線
WO2018025896A1 (ja) 2016-08-02 2018-02-08 住友電気工業株式会社 光ファイバ及び光ファイバの製造方法
JP2019112293A (ja) * 2017-11-16 2019-07-11 オーエフエス ファイテル，エルエルシー 高いシステム光信号対雑音比性能及び非線形性損失による低い劣化を必要とするアプリケーションのための光ファイバ
WO2021090912A1 (ja) * 2019-11-08 2021-05-14 株式会社フジクラ 光ファイバ
JP2022153101A (ja) 2021-03-29 2022-10-12 古河電気工業株式会社 光ファイバ
JP2023022232A (ja) 2018-07-31 2023-02-14 パイオニア株式会社 速度算出装置
JP2023141381A (ja) 2022-03-24 2023-10-05 パナソニックＩｐマネジメント株式会社 空間浄化装置

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Publication number Priority date Publication date Assignee Title
JP2006065006A (ja) * 2004-08-27 2006-03-09 Fujikura Ltd 光ファイバ心線
WO2018025896A1 (ja) 2016-08-02 2018-02-08 住友電気工業株式会社 光ファイバ及び光ファイバの製造方法
JP2019112293A (ja) * 2017-11-16 2019-07-11 オーエフエス ファイテル，エルエルシー 高いシステム光信号対雑音比性能及び非線形性損失による低い劣化を必要とするアプリケーションのための光ファイバ
JP2023022232A (ja) 2018-07-31 2023-02-14 パイオニア株式会社 速度算出装置
WO2021090912A1 (ja) * 2019-11-08 2021-05-14 株式会社フジクラ 光ファイバ
JP2022153101A (ja) 2021-03-29 2022-10-12 古河電気工業株式会社 光ファイバ
JP2023141381A (ja) 2022-03-24 2023-10-05 パナソニックＩｐマネジメント株式会社 空間浄化装置

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Title
F. COCCHINI: "The Lateral Rigidity of Double-Coated Optical Fibers", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 13, no. 8, August 1995 (1995-08-01)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026023588A1 (ja) * 2024-07-26 2026-01-29 住友電気工業株式会社 光ファイバおよび光ケーブル

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