WO2024172150A1 - 光ファイバ - Google Patents

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Publication number
WO2024172150A1
WO2024172150A1 PCT/JP2024/005481 JP2024005481W WO2024172150A1 WO 2024172150 A1 WO2024172150 A1 WO 2024172150A1 JP 2024005481 W JP2024005481 W JP 2024005481W WO 2024172150 A1 WO2024172150 A1 WO 2024172150A1
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WO
WIPO (PCT)
Prior art keywords
resin layer
optical fiber
modulus
less
young
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/005481
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English (en)
French (fr)
Japanese (ja)
Inventor
卓弘 野村
一之 相馬
学 塩▲崎▼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP2025501231A priority Critical patent/JPWO2024172150A1/ja
Priority to CN202480011901.2A priority patent/CN120659765A/zh
Priority to EP24756989.0A priority patent/EP4667433A1/en
Publication of WO2024172150A1 publication Critical patent/WO2024172150A1/ja
Anticipated expiration legal-status Critical
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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

Definitions

  • optical cables will become thinner and more dense.
  • the optical fibers themselves will also need to be thinner.
  • thinner cables will increase the microbending loss that occurs during cabling, which is an issue. Therefore, it is necessary to conduct structural studies based on analytical formulas that can systematically estimate the effects of optical fiber structure.
  • 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 using an approximate formula. Patent Document 1 describes that the approximate formula in Non-Patent Document 1 has been expanded to a form closer to reality.
  • the optical fiber of the present disclosure is an optical fiber comprising a glass fiber including a core and a cladding surrounding the core, a primary resin layer surrounding the glass fiber, and a secondary resin layer surrounding the primary resin layer, wherein, when the radius of the glass fiber is R0 [m], the Young's modulus of the glass fiber is E0 [N/m 2 ], the radius of the primary resin layer is R1 [m], the Young's modulus of the primary resin layer is E1 [N/m 2 ], the radius of the secondary resin layer is R2 [m], and the Young's modulus of the secondary resin layer is E2 [N/m 2 ], the relationship between the lateral rigidity D [N/m 2 ] shown in equation (1) and the bending rigidity H [N ⁇ m 2 ] shown in equation (2) of the optical fiber satisfies equation (3), and the coating eccentricity is 8 ⁇ m or less.
  • c1 0.209367
  • c2 1.206659
  • c3 0.401169
  • FIG. 1 is a cross-sectional view perpendicular to the fiber axis of an optical fiber according to an embodiment.
  • Patent Document 1 The approximation formula in Patent Document 1 is calculated by a numerical analysis in which the diameter (glass diameter) of the glass fiber is limited to 125 ⁇ m. Therefore, it was found that when the formula is applied to an optical fiber having a different glass diameter, the calculated value of the microbending loss may deviate greatly from the measured value. In other words, the optical fiber described in Patent Document 1 may not suppress the microbending loss.
  • the objective of this disclosure is to provide an optical fiber that can more reliably suppress microbending loss.
  • An optical fiber according to one embodiment of the present disclosure is an optical fiber comprising a glass fiber including a core and a cladding surrounding the core, a primary resin layer surrounding the glass fiber, and a secondary resin layer surrounding the primary resin layer, wherein, when the radius of the glass fiber is R0 [m], the Young's modulus of the glass fiber is E0 [N/ m2 ], the radius of the primary resin layer is R1 [m], the Young's modulus of the primary resin layer is E1 [N/ m2 ], the radius of the secondary resin layer is R2 [m], and the Young's modulus of the secondary resin layer is E2 [N/ m2 ], the relationship between the lateral rigidity D [N/ m2 ] shown in equation (1) of the optical fiber and the bending rigidity H [N ⁇ m2 ] shown in equation (2) satisfies equation (3), and the coating eccentricity is 8 ⁇ m or less.
  • 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
  • the lateral rigidity D and bending rigidity H satisfy the formula (3), so that the microbending loss can be reliably suppressed.
  • the coating eccentricity is low, the deviation between the calculated value of the microbending loss and the measured value is unlikely to become large. Therefore, the microbending loss can be more reliably suppressed.
  • the diameter of the glass fiber may be 75 ⁇ m or more and 130 ⁇ m or less. In this way, even if the glass fiber has a small diameter, microbending loss can be more reliably suppressed.
  • the diameter of the glass fiber may be 75 ⁇ m or more and 120 ⁇ m or less. In this way, even if the glass fiber has a small diameter, it is possible to more reliably suppress microbending loss.
  • the Young's modulus of the primary resin layer may be 0.01 MPa or more and 0.8 MPa or less. In this case, since the Young's modulus of the primary resin layer is 0.8 MPa or less, microbending loss can be suppressed. Since the Young's modulus of the primary resin layer is 0.01 MPa or more, damage to the coating resin can be suppressed.
  • the thickness of the secondary resin layer may be 5 ⁇ m or more. In this case, breakage of the optical fiber due to foreign matter can be suppressed.
  • FIG. 1 is a cross-sectional view perpendicular to the fiber axis of an optical fiber according to an embodiment.
  • an optical fiber 1 according to an embodiment includes a glass fiber 10 and a coating resin 20.
  • 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 130 ⁇ m or less.
  • 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 made of 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 diameter of the primary resin layer 21 is, for example, 0 ⁇ m or more and 210 ⁇ m or less.
  • the thickness of the primary resin layer 21 is, for example, 0 ⁇ m or more and 65 ⁇ m or less.
  • the Young's modulus of the primary resin layer 21 may be, for example, 0.01 MPa or more and 0.8 MPa or less, or 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. If the Young's modulus of the primary resin layer 21 is 0.01 MPa or more, damage to the coating resin 20 is suppressed. If the Young's modulus of the primary resin layer 21 is 0.05 MPa or more, damage to the coating resin 20 is further 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, 110 ⁇ m or more and 210 ⁇ 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.
  • the coating eccentricity of the optical fiber 1 is, for example, 8 ⁇ m or less.
  • the coating eccentricity is defined as the distance from the central axis based on the outer periphery of the coating resin 20 (secondary resin layer 22) to the central axis of the glass fiber 10. In a cross section perpendicular to the fiber axis, the coating eccentricity is the deviation between the center based on the outer periphery of the coating resin 20 and the center of the glass fiber 10.
  • the coating eccentricity may be 6 ⁇ m or less. Since the coating eccentricity is likely to change in the longitudinal direction of the optical fiber 1, it is desirable to measure it at multiple points in the longitudinal direction of the optical fiber 1. Preferably, the average value of values measured at 500 or more points every 1 mm to 100 mm may be used as the coating eccentricity.
  • the radius of the glass fiber 10 is R0 [m]
  • the Young's modulus of the glass fiber 10 is E0 [N/m 2 ]
  • the radius of the primary resin layer 21 is R1 [m]
  • the Young's modulus of the primary resin layer 21 is E1 [N/m 2 ]
  • the radius of the secondary resin layer 22 is R2 [m]
  • the Young's modulus of the secondary resin layer 22 is E2 [N/m 2 ]
  • the relationship between the lateral rigidity (lateral elastic modulus) D [N/m 2 ] shown in equation (1) and the bending rigidity (bending elastic modulus) H [N ⁇ m 2 ] shown in equation (2) of the optical fiber 1 satisfies equation (3).
  • c1 0.209367
  • c2 1.206659
  • c3 0.401169
  • Equation (2) is the equation for bending stiffness H shown in Non-Patent Document 1. The methods for deriving equations (1) and (3) are explained below.
  • microbending loss ⁇ of an optical fiber is expressed by the approximation formula (4) using the lateral rigidity D, bending rigidity H, and proportionality constant A [10 -3 ⁇ dB ⁇ N ⁇ m 5 ] depending on the propagation characteristics of the optical fiber.
  • the microbending loss ⁇ of the small diameter optical fiber is 5.0 dB/km, and may be 3.0 dB/km or less, or 1.0 dB/km or less. Therefore, the constant A in formula (4) was calculated from the actual measurement value of the microbending loss ⁇ , and the results of determining D/H 2 that satisfies the above value are shown in Table 1. From the results shown in Table 1, formula (3) was obtained as the conditional formula for D/H 2 that suppresses the microbending loss ⁇ to 5.0 dB/km or less.
  • the lateral stiffness D of each vehicle was calculated based on the analysis results using the following formula.
  • D 2F ⁇ R2/uy *
  • F is the lateral pressure (1 MPa)
  • ⁇ is the stress application angle (0 degrees or more and 9 degrees or less)
  • uy * is the displacement amount of the pressurized part in each structure.
  • the formula (1) is obtained.
  • the lateral stiffness D can be calculated, and D/ H2 in the formula (3) can be obtained.
  • the lateral rigidity D and bending rigidity H satisfy the formula (3), so that microbending loss can be reliably suppressed.
  • the coating eccentricity increases, the deviation between the calculated value and the measured value of microbending loss increases.
  • the coating eccentricity is 8 ⁇ m or less, so the deviation between the calculated value and the measured value of microbending loss is suppressed. Therefore, microbending loss can be more reliably suppressed.
  • the coating eccentricity is 5 ⁇ m
  • the relative error between the calculated value and the measured value is 5.3%.
  • the coating eccentricity is 8 ⁇ m
  • the relative error between the calculated value and the measured value is 9.8%.
  • the coating eccentricity is 10 ⁇ m, the relative error between the calculated value and the measured value is 21.8%. Since a relative error of 10% or less is desirable, the coating eccentricity is preferably 8 ⁇ m or less. In order to further reduce the relative error, the lower the coating eccentricity, the better.
  • the Young's modulus of the primary resin layer 21 In order to suppress microbending loss, the lower the Young's modulus of the primary resin layer 21, the better. On the other hand, if the Young's modulus of the primary resin layer 21 is too low, the coating resin 20 may be damaged. In the optical fiber 1, the Young's modulus of the primary resin layer is 0.01 MPa or more and 0.8 MPa or less, so that it is possible to suppress damage to the coating resin 20 while suppressing microbending loss.
  • the thickness of the secondary resin layer 22 is less than 5 ⁇ m, there is a risk that the optical fiber 1 may break due to foreign matter.
  • the thickness of the secondary resin layer 22 is 5 ⁇ m or more, so that breakage of the optical fiber 1 due to foreign matter is suppressed.
  • the diameter of the glass fiber 10 may be less than 60 ⁇ m or more than 125 ⁇ m.
  • the lateral stiffness D is calculated based on a numerical analysis performed with the cladding diameter (2R0) in the range of 75 ⁇ m to 130 ⁇ m, so that the microbending loss can be approximated accurately within this range, but approximation is also possible even if the cladding diameter exceeds this range.
  • the primary diameter (2R1), secondary diameter (2R1), Young's modulus E1 of the primary resin layer, and Young's modulus E2 of the secondary resin layer the microbending loss can be approximated accurately within the ranges specified by the numerical analysis, but approximation is also possible even if the cladding diameter exceeds this range.

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
PCT/JP2024/005481 2023-02-16 2024-02-16 光ファイバ Ceased WO2024172150A1 (ja)

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JP2025501231A JPWO2024172150A1 (https=) 2023-02-16 2024-02-16
CN202480011901.2A CN120659765A (zh) 2023-02-16 2024-02-16 光纤
EP24756989.0A EP4667433A1 (en) 2023-02-16 2024-02-16 Optical fiber

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JP2023022232 2023-02-16
JP2023-022232 2023-02-16

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Cited By (2)

* 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
WO2026058914A1 (ja) * 2024-09-11 2026-03-19 住友電気工業株式会社 光ファイバ

Citations (7)

* Cited by examiner, † Cited by third party
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
JP2014125405A (ja) * 2012-12-27 2014-07-07 Fujikura Ltd 光ファイバ素線
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
WO2021187466A1 (ja) * 2020-03-18 2021-09-23 日東電工株式会社 被覆光ファイバの製造方法および被覆光ファイバ製造装置
JP2023022232A (ja) 2018-07-31 2023-02-14 パイオニア株式会社 速度算出装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
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
JP2014125405A (ja) * 2012-12-27 2014-07-07 Fujikura Ltd 光ファイバ素線
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
WO2021187466A1 (ja) * 2020-03-18 2021-09-23 日東電工株式会社 被覆光ファイバの製造方法および被覆光ファイバ製造装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
F. COCCHINI: "The Lateral Rigidity of Double-Coated Optical Fibers", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 13, no. 8, August 1995 (1995-08-01)
See also references of EP4667433A1

Cited By (2)

* 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
WO2026058914A1 (ja) * 2024-09-11 2026-03-19 住友電気工業株式会社 光ファイバ

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JPWO2024172150A1 (https=) 2024-08-22
EP4667433A1 (en) 2025-12-24
CN120659765A (zh) 2025-09-16

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