WO2021187514A1 - 光ファイバ心線、光ファイバケーブル及び光ファイバテープ心線 - Google Patents

光ファイバ心線、光ファイバケーブル及び光ファイバテープ心線 Download PDF

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Publication number
WO2021187514A1
WO2021187514A1 PCT/JP2021/010778 JP2021010778W WO2021187514A1 WO 2021187514 A1 WO2021187514 A1 WO 2021187514A1 JP 2021010778 W JP2021010778 W JP 2021010778W WO 2021187514 A1 WO2021187514 A1 WO 2021187514A1
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Prior art keywords
optical fiber
layer
core wire
primary layer
primary
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English (en)
French (fr)
Japanese (ja)
Inventor
稔 笠原
悦宏 新子谷
望月　浩二
昌宏 矢部
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Priority to JP2022508402A priority Critical patent/JPWO2021187514A1/ja
Publication of WO2021187514A1 publication Critical patent/WO2021187514A1/ja
Priority to US17/821,537 priority patent/US11914205B2/en
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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
    • G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02004—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
    • G02B6/02004—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
    • G02B6/02014—Effective area greater than 60 square microns in the C band, i.e. 1530-1565 nm
    • G02B6/02019—Effective area greater than 90 square microns in the C band, i.e. 1530-1565 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4403—Optical cables with ribbon structure

Definitions

  • the present invention relates to an optical fiber core wire, an optical fiber cable, and an optical fiber tape core wire. More specifically, the present invention relates to an optical fiber core wire, an optical fiber cable, and an optical fiber tape core wire capable of suppressing transmission loss (microbend loss) due to microbend.
  • an optical fiber such as a glass optical fiber has at least two coating layers such as a primary layer (also referred to as a primary coating layer) and a secondary layer (also referred to as a secondary coating layer). Is formed, and this is used as an optical fiber core wire.
  • a primary layer also referred to as a primary coating layer
  • a secondary layer also referred to as a secondary coating layer
  • the elastic modulus of the primary layer is small and the secondary layer is formed. It was common to increase the elastic modulus of. Further, while reducing the coating thickness of the coating layer in the optical fiber in order to increase the density and multicenter of the optical cable, the elastic modulus (Young's modulus) of the secondary layer is further increased in order to compensate for the lateral pressure characteristics and the like.
  • the technology is provided (see, for example, Patent Document 1 and the like).
  • optical fibers are desired to have good transmission characteristics even in a low temperature environment of about -60 ° C.
  • there is a technique that it is necessary to make adjustments such as making the sum of the contraction stress indexes defined based on the Young's modulus, the cross-sectional area, the effective linear expansion coefficient, etc. of the coating layer at ⁇ 40 ° C. below a certain value. It is provided (see, for example, Patent Document 2 and the like).
  • the elastic modulus is adjusted as described in Patent Document 1 and described in Patent Document 2. It was difficult to suppress the transmission loss in a low temperature environment such as -60 ° C only by adjusting the parameters such as the shrinkage stress index.
  • the present invention has been made in view of the above problems, and even an optical fiber having a high microbend sensitivity can suppress a transmission loss (microbend loss) in a low temperature environment such as -60 ° C.
  • the purpose of the present invention is to provide a core wire, an optical fiber cable, and an optical fiber tape core wire.
  • the primary layer that covers the optical fiber around the optical fiber and the secondary layer that covers the primary layer around the primary layer are in this order. It is an optical fiber core wire formed by The effective core cross-sectional area A eff at a wavelength of 1550 nm of the optical fiber is 130 ⁇ m 2 or more.
  • the coating thickness of the primary layer is P ( ⁇ m)
  • the coating thickness of the secondary layer is S ( ⁇ m)
  • the coefficient of thermal expansion of the primary layer is ⁇ P (/ K)
  • the elastic modulus (primary elastic modulus) of the primary layer is determined by PISM (MPa).
  • the elastic modulus (secondary elastic modulus) of the secondary layer is determined by SISM (MPa). , At least one of the conditions of the following formula (I) and the condition of the formula (II) is satisfied.
  • the optical fiber core wire according to the present invention is characterized in that, in the present invention described above, the ratio (S / P) of the coating thickness P of the primary layer to the coating thickness S of the secondary layer is less than 1. ..
  • the elastic modulus of the secondary layer (secondary modulus) S ISM is equal to or less than 2000 MPa.
  • optical fiber cable according to the present invention is characterized by including the above-mentioned optical fiber core wire according to the present invention.
  • optical fiber tape core wire according to the present invention is characterized by including a plurality of the above-mentioned optical fiber core wires according to the present invention.
  • the optical fiber Since the present invention satisfies at least one of the condition of the degree of freedom of the primary layer shown in the formula (I) and the condition of the rigidity of the secondary layer shown in the formula (II), the optical fiber is satisfied.
  • Transmission loss (microbend loss) in a low temperature environment for example, -60 ° C.
  • an optical fiber having a large effective core cross-sectional area A eff at a fiber wavelength of 1550 nm and high microbend sensitivity is used.
  • an optical fiber core wire capable of suppressing transmission loss in a low temperature environment.
  • optical fiber cable and the optical fiber tape core wire provided with the optical fiber core wire according to the present invention enjoy the effect of the above-mentioned optical fiber core wire and are in a low temperature environment (for example, ⁇ 60 ° C., etc.).
  • An optical fiber cable or an optical fiber tape core wire provided with an optical fiber core wire capable of suppressing transmission loss.
  • the optical fiber core wire 1 In the optical fiber core wire 1 according to the present invention, at least two coating layers (primary layer 11 and secondary layer 12) for covering the optical fiber 10 around the optical fiber 10 are formed.
  • FIG. 1 is a cross-sectional view showing an example of the structure of the optical fiber core wire 1.
  • 1 is an optical fiber core wire
  • 10 is an optical fiber
  • 11 is a primary layer (primary coating layer)
  • 12 is a secondary layer (secondary coating layer).
  • a primary layer (primary coating layer) 11 is formed around the optical fiber 10
  • a secondary layer (secondary coating layer) 12 is formed around the primary layer 11. Since the transmission loss of the optical fiber 10 increases due to various external stresses and microbends generated by the external stresses, it is necessary to protect the optical fiber 10 from such external stresses, and generally, a protective layer is used. As a result, a coating having a two-layer structure of a primary layer 11 and a secondary layer 12 is applied.
  • the optical fiber 10 such as a glass optical fiber is not particularly limited, but in the present invention, the effective core cross-sectional area A eff (details will be described later) at a wavelength of 1550 nm of the optical fiber 10 is large, and the microbend sensitivity is high. High optical fiber 10 can be preferably used.
  • an optical fiber 10 having an effective core cross-sectional area (effective core cross-sectional area) A eff of 130 ⁇ m 2 or more ( ⁇ 130 ⁇ m 2 ) at a wavelength of 1550 nm is used.
  • a eff is an index of microbend sensitivity, and the larger A eff is, the higher the micro bend sensitivity is (generally, it is said that the micro bend sensitivity is high when A eff > 100 ⁇ m 2). Therefore, when the A eff is 130 ⁇ m 2 or more, the optical fiber 10 has a high microbend sensitivity without any problem, and the present invention can cope with such a thing.
  • the effective core cross-sectional area (effective core cross-sectional area) A eff at a wavelength of 1550 nm is larger than 130 ⁇ m 2 (> 130 ⁇ m 2).
  • the effective core cross-sectional area (effective core cross-sectional area) A eff at a wavelength of 1550 nm is expressed by the formula (MFD) 2 ⁇ ⁇ ⁇ k / 4 (in addition, MFD is a mode field diameter ( ⁇ m). k is a constant.), For example, it is described in C-3-76 and C-3-77 of the 1999 Proceedings of the Electronics Society Conference of the Society of Electronics, Information and Communication Engineers.
  • the primary layer 11 formed around the optical fiber 10 is, for example, an inner layer in contact with quartz glass constituting the glass optical fiber when the optical fiber 10 is a glass optical fiber, and generally has a relatively small elastic coefficient.
  • a soft resin is used.
  • the outer layer of the primary layer 11 is generally coated with a secondary layer 12 using a hard resin having a relatively large elastic modulus.
  • the constituent materials of the primary layer 11 and the secondary layer 12 include ultraviolet curable resins such as oligomers, diluting monomers, photoinitiators, silane coupling agents, sensitizers, lubricants, and the above-mentioned various additives.
  • Ingredients can be preferably used (note that the additives are not limited to these, and conventionally known additives and the like used for ultraviolet curable resins and the like can be widely used).
  • the oligomer conventionally known materials such as polyether urethane acrylate, epoxy acrylate, polyester acrylate, and silicone acrylate can be used.
  • diluting monomer a monofunctional monomer, a polyfunctional monomer or the like can be used as the diluting monomer.
  • the coating thickness of the primary layer 11 is P ( ⁇ m)
  • the coating thickness of the secondary layer 12 is S ( ⁇ m)
  • the coefficient of thermal expansion of the primary layer 11 is ⁇ P (/ K)
  • the elastic modulus of the primary layer 11 (primary elastic modulus) is PISM (MPa)
  • the elastic modulus (secondary elastic modulus) of the secondary layer 12 is set to SISM (MPa)
  • at least one of the conditions of the following formula (I) and the condition of formula (II) is satisfied.
  • the formula (I) is obtained by multiplying the coefficient of thermal expansion ⁇ P of the primary layer 11 by the elastic modulus PISM of the primary layer 11, and is a condition indicating the degree of freedom (movability) of the primary layer 11 (movability).
  • the unit is MPa / K, but it is not particularly included in the formula (I).
  • the degree of freedom required by the formula (I) is high, and the primary layer 11 is easily moved inside the optical fiber core wire 1 (between the optical fiber 10 and the secondary layer 12). If there is, it is considered that even if the optical fiber core wire 1 is finely bent, the fine bending can be relaxed by the primary layer 11. As a result, it becomes difficult to transmit the fine bending behavior to the optical fiber 10, and it is considered that the transmission loss (microbend loss) can be suppressed.
  • Equation (II) is the product of the ratio of coating thickness (S / P) to the ratio of elastic modulus ( SISM / P ISM ) with respect to the primary layer, and is the rigidity of the secondary layer 12. Show the conditions.
  • the secondary layer 12 is basically the outermost layer of the optical fiber core wire 1, and the rigidity of the secondary layer 12 obtained by the equation (II) affects the rigidity of the entire optical fiber core wire 1 so to speak.
  • the rigidity of the secondary layer 12 is relatively high, it becomes difficult to bend the secondary layer 12 or the optical fiber core wire 1 when the optical fiber core wire 1 is slightly bent. Therefore, the rigidity of the secondary layer 12 is increased. If the property is excessive, it becomes difficult to release stress from the secondary layer 12 for fine bending of the optical fiber 10. From the above, it is necessary to suppress the rigidity of the secondary layer 12 represented by the equation (II) to a certain degree even in a low temperature environment.
  • satisfying at least one of the above-mentioned conditions of the formula (I) and the condition of the formula (II) is, in other words, the condition of the following formula (I') and the condition of the formula (II'). The case where both of the above conditions are satisfied is excluded.
  • the reason for excluding the case where both the condition of the formula (I') and the condition of the formula (II') are satisfied will be described.
  • the primary layer 11 which is relatively soft at room temperature also becomes hard (note that the secondary layer 12 is also hard at room temperature), so that the relaxation effect of the primary layer 11 does not function so much.
  • the rigidity of the secondary layer 12 when the rigidity of the secondary layer 12 is as low as 1000 or less (the condition shown in the equation (II) is satisfied), the stress is released to the secondary layer 12 without being affected by the degree of freedom of the primary layer 11. Is thought to be possible.
  • the rigidity of the secondary layer 12 when the rigidity of the secondary layer 12 is higher than 1000 (the condition shown in the formula (II') is satisfied), the degree of freedom of the primary layer 11 is 600 or more (the condition shown in the formula (I') is satisfied. In the case of.), The stress generated by the fine bending cannot be released to the rigid secondary layer 12. In this case, the generated stress is transmitted to the optical fiber 10 side, and as a result, the transmission loss (microbend loss) is increased.
  • the degree of freedom of the primary layer 11 is low. Since it becomes hard at a low temperature and becomes more difficult to bend, it is considered that stress is not easily transmitted to the optical fiber 10 side and transmission loss (microbend loss) can be suppressed.
  • the degree of freedom of the primary layer 11 represented by the formula (I) does not satisfy the condition of the formula (II) that the rigidity of the secondary layer 12 represented by the formula (II) is higher than 1000 (that is, the condition of the formula (II') is not satisfied. In the case of)), it is preferably 50 MPa / K or more and less than 600 MPa / K. When the rigidity of the secondary layer 12 is 1000 or less (that is, the condition of the formula (II) is satisfied), it is preferably 50 to 7500 MPa / K.
  • the rigidity of the secondary layer 12 represented by the formula (II) is when the degree of freedom of the primary layer 11 represented by the formula (I) is less than 600 MPa / K (that is, the condition of the formula (I) is satisfied). Is preferably 25 to 9000 MPa / K. Further, when the degree of freedom of the primary layer 11 is 600 MPa / K or more (that is, the condition of the formula (I) is not satisfied (the condition of the formula (I') is satisfied)), it is less than 1000 ( ⁇ 1000). It is preferable to set it to 25 to 1000, and it is particularly preferable to set it to 25 to 1000.
  • the degree of freedom of the primary layer 11 determined by the formula (I) or the rigidity of the secondary layer 12 determined by the formula (II) satisfies the above-mentioned conditions.
  • the optical fiber core wire 1 that is, the freedom of the primary layer 11.
  • Degree of freedom ⁇ P ⁇ P ISM (MPa / K) is lower than 600, or the rigidity (S / P) ⁇ ( SISM / P ISM ) of the secondary layer 12 is not 1000 or less.
  • the degree of freedom of the secondary layer 12 is generally the secondary layer 12.
  • the degree of freedom of the primary layer 11 tends to decrease as the rigidity increases.
  • Standards for example, 0.05 dB / km or less
  • the condition of the degree of freedom of the primary layer 11 (formula (formula)) based on the relationship between the degree of freedom of the primary layer 11 and the transmission loss described above. I)
  • the condition of the rigidity of the secondary layer 12 (Equation (II)) is selected as the above-mentioned range from the relationship between the rigidity of the secondary layer 12 and the transmission loss.
  • the value of the coefficient of thermal expansion ⁇ P of the primary layer 11 affects the parameter of the above formula (I), but the coefficient of thermal expansion ⁇ P of the primary layer 11 is changed because the parameter of the formula (I) is provided. , 250 to 2500 / K is preferable.
  • the coefficient of thermal expansion of the primary layer 11 By setting the coefficient of thermal expansion of the primary layer 11 to such a range, the degree of freedom of the primary layer 11 represented by the formula (I) can be set to an appropriate range.
  • the coefficient of thermal expansion of the primary layer 11 may be measured by, for example, the method described in the following [Example].
  • the elastic modulus (primary modulus) P ISM primary layer 11 for having a parameter represented by the formula (I) and formula (II) is preferably set to 0.2 ⁇ 3.0 MPa However, the range is not particularly limited. In general, when the elastic modulus is increased, the coefficient of thermal expansion decreases, and it is preferable to determine the elastic modulus PISM of the primary layer 11 in consideration of the balance between the two.
  • the elastic modulus of the secondary layer 12 to comprise a parameter of the formula (II) (secondary modulus) S ISM is preferably set to 2000MPa or less ( ⁇ 2000MPa). By setting the elastic modulus of the secondary layer 12 to 2000 MPa or less, the rigidity of the secondary layer 12 represented by the formula (II) can be set within an appropriate range.
  • the elastic modulus of the secondary layer 12 is particularly preferably 500 to 2000 MPa.
  • the elastic modulus of each of the primary layer 11 and the secondary layer 12 may be measured by, for example, the method described in the following [Example].
  • the elastic modulus of the primary layer 11 corresponds to the so-called In-situ Modulus (ISM)
  • the elastic modulus of the secondary layer 12 corresponds to the so-called 2.5% Second Modulus (Secant Modulus).
  • the loss level of transmission loss at a wavelength of 1550 nm can be suppressed to a value smaller than 0.05 dB / km at a wavelength of 1550 nm (1.55 ⁇ m).
  • the coating thickness P of the primary layer 11 is preferably 10 to 60 ⁇ m
  • the coating thickness S of the secondary layer 12 is preferably 10 to 60 ⁇ m.
  • the thickness of each layer is not limited to these values and can be changed arbitrarily.
  • the ratio (S / P) of the coating thickness P of the primary layer 11 and the coating thickness S of the secondary layer 12 is preferably less than 1 ( ⁇ 1). If the ratio is less than 1 (that is, the primary layer 11 is thicker than the secondary layer 12), the secondary layer 12 is relatively flexible, which leads to the primary layer 11 becoming easier to move, and the suppression of transmission loss is efficient. You can plan well.
  • the elastic modulus of the primary layer 11 and the secondary layer 12 and the coefficient of thermal expansion of the primary layer 11 are adjusted by, for example, the components such as the ultraviolet curable resin constituting the primary layer 11 and the secondary layer 12 and the manufacturing conditions of these layers. It can be carried out by adjusting the above.
  • the type, molecular weight and content of the oligomer in the ultraviolet curable resin and the like constituting the primary layer 11 and the secondary layer 12 the type and addition amount of the diluted monomer, the type and content of other components, the irradiation intensity, etc.
  • the elastic modulus of the primary layer 11 and the secondary layer 12 can be adjusted depending on the conditions of ultraviolet curing and the like.
  • the elastic modulus can be increased by reducing the molecular weight of the oligomer or increasing the content or functional group of the diluted monomer to be added, so these may be used as parameters for adjustment.
  • the crosslink density becomes high and the shrinkage also becomes large, so it is preferable to adjust in consideration of the balance.
  • the optical fiber core wire 1 for example, first, a preform containing quartz glass as a main component is heated and melted by a drawing furnace (not shown) to obtain a quartz glass optical fiber (glass optical fiber 10).
  • a liquid ultraviolet curable resin is applied to the glass optical fiber 10 using a coating die, and then the ultraviolet curable resin applied by an ultraviolet irradiation device (UV irradiation device) (not shown) is irradiated with ultraviolet rays. Cure the ingredients.
  • UV irradiation device ultraviolet irradiation device
  • the optical fiber core wire 1 in which the glass optical fiber 10 is coated with the primary layer 11 and the secondary layer 12 is manufactured.
  • the type of ultraviolet curable resin, the intensity of ultraviolet irradiation during the curing treatment, and the like are determined so that the coefficient of thermal expansion and elastic modulus of the primary layer 11 and the elastic modulus of the secondary layer 12 are within a predetermined range. It is preferable to control as appropriate.
  • the optical fiber core wire 1 according to the present invention described above is at least one of the condition of the degree of freedom of the primary layer 11 shown in the formula (I) and the condition of the rigidity of the secondary layer 12 shown in the formula (II). Since the two conditions are satisfied, even when an optical fiber 10 having a large effective core cross-sectional area A eff at a wavelength of 1550 nm and a high microbend sensitivity is used, the optical fiber 10 is used in a low temperature environment (for example, for example).
  • an optical fiber core wire 1 capable of suppressing a transmission loss (microbend loss) at (-60 ° C.) and suppressing a transmission loss in a low temperature environment.
  • the present invention can be widely used as an optical fiber core wire 1 constituting an optical fiber tape core wire or as an optical fiber core wire 1 housed in an optical fiber cable. Further, the optical fiber cable and the optical fiber tape core wire configured by providing the optical fiber core wire 1 according to the present invention enjoy the effect of the optical fiber core wire 1 described above. That is, the present invention transmits in a low temperature environment (for example, ⁇ 60 ° C.) even when an optical fiber 10 having a large effective core cross-sectional area A eff at a wavelength of 1550 nm and a high microbend sensitivity is used. Provided is an optical fiber cable or an optical fiber tape core wire provided with an optical fiber core wire 1 capable of suppressing loss.
  • the configuration of the optical fiber cable is not particularly shown, it can be a conventionally known optical fiber cable, for example, a configuration in which the optical fiber core wire 1 according to the present invention is provided and an outer skin (sheath) is coated on the outer periphery thereof.
  • the composition is not particularly limited.
  • the configuration of the optical fiber cable or the like covered with) is arbitrary. Therefore, a conventionally known optical fiber cable configuration can be used, including configurations other than those described above.
  • optical fiber drop cable in which a pair of notches formed in the longitudinal direction are formed on both sides of the optical fiber cable, and a support portion having a built-in support wire is arranged if necessary. I do not care.
  • the configuration of the optical fiber cable is not limited to the above configuration, and for example, the type and thickness of the material constituting the outer skin (sheath), the number and size of the optical fiber core wires 1, and the type of tension member. , The number and size can be freely selected. Further, the outer diameter and cross-sectional shape of the optical fiber cable, the shape and size of the notch, the presence or absence of the notch formation, and the like can be freely selected.
  • the configuration of the optical fiber tape core wire including a plurality of optical fiber core wires 1 is not particularly shown, a plurality of optical fiber core wires 1 according to the present invention are provided in parallel arrangement or the like, and a predetermined tape material or the like is provided.
  • a conventionally known configuration of an optical fiber tape core wire which is connected or covered with a wire can be adopted, and the optical fiber tape core wire includes any of a flat ribbon wire, a rollable ribbon wire, and the like.
  • a plurality of optical fiber core wires 1 may be arranged in parallel and connected and integrated by a connecting portion made of an ultraviolet curable resin or the like.
  • the number (number of cores) of the optical fiber core wires 1 in the optical fiber tape core wire can also be, for example, 4 cores, 8 cores, 12 cores, 24 cores, etc. There is no particular limitation on the number of lines 1 and the like, and they can be freely selected.
  • the configuration of the optical fiber core wire 1 has been described by showing a configuration in which a primary layer 11 is formed around the optical fiber 10 and a secondary layer 12 is formed around the primary layer 11 in this order.
  • a colored layer 13 may be formed around the secondary layer 12 (referred to as an optical fiber colored core wire 1).
  • FIG. 2 is a cross-sectional view showing another example of the structure of the optical fiber core wire 1.
  • the primary layer 11 and the secondary layer 12 described above are configured as the constituent materials of the colored layer 13.
  • components such as the above-mentioned various additives such as oligomers, diluting monomers, photoinitiators, silane coupling agents, sensitizers, pigments, lubricants, etc., which are the ultraviolet curable resins listed as the components to be used. Can be done.
  • the secondary layer 12 may be colored and used as the colored secondary layer 12 as the outermost layer of the optical fiber core wire 1.
  • the colored secondary layer 12 can be obtained by adding a coloring material mixed with a pigment, a lubricant, or the like to the secondary layer 12.
  • the content of the coloring material in the colored secondary layer 12 may be appropriately determined depending on the content of the pigment contained in the coloring material, the type of other components such as the ultraviolet curable resin, and the like.
  • the specific structure, shape, etc. at the time of carrying out the present invention may be other structures, etc. as long as the object of the present invention can be achieved.
  • the cable cutoff wavelength of the optical fiber core wire is 1260 nm to 1520 nm. Further, the examination was conducted mainly on the optical fiber having a glass diameter of about 125 ⁇ m, but even when the glass diameter is set to 100 ⁇ m or 80 ⁇ m, the conditions of the formulas (I) and (II) are satisfied. The desired properties were confirmed.
  • the primary layer and the secondary layer were manufactured using a commercially available ultraviolet curable resin (oligomer, diluted monomer, photoinitiator, silane coupling agent, sensitizer, lubricant, etc.).
  • a commercially available ultraviolet curable resin oligomer, diluted monomer, photoinitiator, silane coupling agent, sensitizer, lubricant, etc.
  • the type of the ultraviolet curable resin and the ultraviolet irradiation conditions for example, so as to have the values shown in Table 1).
  • UV curing conditions, etc. depending on the weight average molecular weight, content, type and number of functional groups in the dilute monomer, content, type of photoinitiator, UV irradiation intensity, etc.
  • UV curing conditions, etc. depending on the weight average molecular weight, content, type and number of functional groups in the dilute monomer, content, type of photoinitiator, UV irradiation intensity, etc.
  • Example 1 and Comparative Example 1 the primary layer and the secondary layer use the same material, and the coating thickness and the manufacturing conditions of the primary layer and the secondary layer (ultraviolet irradiation intensity, etc. The same) was changed (adjusted) and manufactured.
  • Example 2 and Comparative Example 2 were produced by using common materials for the primary layer and the secondary layer, and changing (adjusting) the coating thickness and the production conditions of the primary layer and the secondary layer, respectively.
  • Examples 3 to 5 the materials of the primary layer are different and the materials of the secondary layer are common in Examples 3 and 4, and the materials of the primary layer are common and the materials of the secondary layer are common in Examples 4 and 5. Different (the materials of the primary layer and the secondary layer are different in Examples 3 and 5), and the coating thickness and the production conditions of the primary layer and the secondary layer were changed (adjusted), respectively. Examples 6 and 7 were produced by using common materials for the primary layer and the secondary layer, and changing (adjusting) the coating thickness and the production conditions of the primary layer and the secondary layer, respectively.
  • Elastic modulus of the primary layer was measured by the following method. First, a few mm of the primary layer and the secondary layer in the middle part of the optical fiber are peeled off using a commercially available stripper, and then one end of the optical fiber on which the coating is formed is fixed on the slide glass with an adhesive and coated. A load F is applied to the other end of the optical fiber in which the above is formed. In this state, the displacement ⁇ of the primary layer at the boundary between the stripped portion and the coated portion was read with a microscope.
  • ISM In-situ Modulus
  • P ISM elastic modulus of the primary layer MPa
  • the slope of the graph shows the displacements ([delta]) relative to F / [delta] is a load (F)
  • l is the sample length (e.g. 10mm)
  • D P / D G is the primary it is the ratio of the outside diameter of the layer (D P) ( ⁇ m) and the outer diameter of the optical fiber (D G) ( ⁇ m).
  • the outer diameter of the primary layer and the outer diameter of the optical fiber were measured by observing the cross section of the optical fiber cut by the fiber cutter with a microscope (see also (3) described later).
  • Coefficient of thermal expansion of the primary layer The method of calculating the coefficient of thermal expansion of the primary layer (coefficient of thermal expansion of -50 ° C to 25 ° C) will be described below (specifically, Furukawa Denko Jiho No. 122 (September 2008), "Optical fiber”. The method for measuring thermal strain / thermal stress generated in the coating layer ”and“ 4-3 ”was followed. The outline is shown below).
  • TMA thermomechanical analysis For the measurement of the coefficient of thermal expansion, a commercially available TMA thermomechanical analysis (METTTLER Toledo TMA 40) was used to measure the longitudinal direction and the outer diameter direction. The measurement conditions are: applied load: 0 load, temperature range: cooling rate at -10 ° C / min at 25 ° C to -100 ° C, holding time at -100 ° C for 10 minutes, and heating rate at -100 ° C to 100 ° C. The temperature was set to 10 ° C./min.
  • the measurement was performed using a tube coating sample (tube sample) in the tension mode, and in the outer diameter direction, the measurement was performed using the fiber sample and the tube coating sample (tube sample) in the compression mode.
  • each line is based on -50 ° C, which is near the glass transition temperature of the primary layer.
  • the linear expansion coefficient is obtained from the inclination of the temperature range of -50 ° C to 25 ° C, which is the range in which the measurement result changes linearly.
  • the coefficient of thermal expansion of the primary layer and the secondary layer (coefficient of thermal expansion of -50 ° C to 25 ° C) is the tensile mode (longitudinal direction) of the tube coating sample (tube sample) and the compression mode (outside) of each of the fiber sample and tube sample. It was estimated from the coefficient of linear expansion (in the radial direction).
  • the coefficient of thermal expansion of the primary layer (the coefficient of thermal expansion of ⁇ 50 ° C. to 25 ° C., hereinafter simply referred to as the “coefficient of thermal expansion” including the secondary layer)
  • the coefficient of thermal expansion of the secondary layer is used.
  • the coefficient was calculated.
  • the glass transition temperature of the primary layer is as low as about -50 ° C. In the temperature range above the glass transition temperature such as -50 ° C to 25 ° C, the primary layer of the tube coating sample (tube sample) is in a rubber state, and the elastic modulus is significantly smaller than that of the secondary layer. Can expand and contract freely.
  • the coefficient of thermal expansion of the secondary layer is obtained by doubling the coefficient of linear expansion in the outer radial direction and adding the coefficient of linear expansion in the longitudinal direction, and the coefficient of thermal expansion of the secondary layer is calculated by the following formula (Y).
  • ⁇ S is the coefficient of thermal expansion (volume coefficient of thermal expansion) (/ K) of the secondary layer
  • ⁇ SL is the coefficient of linear expansion in the longitudinal direction of the secondary layer (/ K)
  • ⁇ SR is the coefficient of linear expansion in the outer diameter direction of the secondary layer.
  • the coefficient of linear expansion (/ K) is shown.
  • the coefficient of thermal expansion of the primary layer (coefficient of thermal expansion of ⁇ 50 ° C. to 25 ° C.) was calculated from the following formula (Z).
  • ⁇ P is the coefficient of thermal expansion (volume of thermal expansion) (/ K) of the primary layer
  • ⁇ S is the coefficient of thermal expansion (volume of thermal expansion) (/ K) of the secondary layer (formula (Z). calculated by Y).
  • alpha FR coefficient of linear expansion (/ K in the outer diameter direction of the fiber samples)
  • D G is the outer diameter (about 125 ⁇ m optical fiber)
  • an outer diameter of D P is the primary layer ([mu] m)
  • D S is the outer diameter of which indicates the outer diameter of the secondary layer ([mu] m), respectively (primary layer, "the outer diameter of the optical fiber + (coating thickness ⁇ 2 primary layer)", the outer diameter of the secondary layer, " It was calculated as "outer diameter of the primary layer + (coating thickness of the secondary layer x 2)".)
  • the transmission loss in a low temperature environment (-60 ° C.) was measured. Specifically, the optical fiber core wire was placed in a heat cycle tank, and the transmission loss was measured while performing a heat cycle test at ⁇ 60 ° C. to 85 ° C. for 3 cycles.
  • the transmission loss is measured by measuring the transmission loss at a wavelength of 1550 nm (1.55 ⁇ m) at ⁇ 60 ° C., and the transmission loss is 0.05 dB / km or less (0.05 dB / km or less). The case was passed, and the case exceeding 0.05 dB / km was rejected.) Was used as the criterion.
  • Examples 1 to 7 are of the formulas (I) and (II), which satisfy at least one condition of the formulas (I) and (II).
  • the optical fiber core wire satisfying both conditions is transmitted in a low temperature environment when an optical fiber having a fiber effective cross-sectional area of 130 ⁇ m 2 or more at a wavelength of 1550 nm and having high microbend sensitivity is used as the optical fiber.
  • the loss (microbend loss) was 0.05 dB / km or less, and the transmission loss could be suppressed.
  • the optical fiber core wires of Comparative Example 1 and Comparative Example 2 which do not satisfy both the conditions of the formula (I) and the formula (II) have a transmission loss of more than 0.05 dB / km, and the transmission loss can be suppressed. There wasn't.
  • Optical fiber core wire optical fiber colored core wire
  • Optical fiber 11 Primary layer (primary coating layer) 12 ; Secondary layer (secondary coating layer) 13 ; Colored layer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
PCT/JP2021/010778 2020-03-18 2021-03-17 光ファイバ心線、光ファイバケーブル及び光ファイバテープ心線 Ceased WO2021187514A1 (ja)

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WO2002066390A1 (fr) * 2001-02-20 2002-08-29 Sumitomo Electric Industries, Ltd. Fibre optique revetue, bande centrale de fibre optique utilisant cette derniere et ensemble de fibre optique
US20030215196A1 (en) * 2000-11-22 2003-11-20 Dsm N.V. Coated optical fibers
JP2004059420A (ja) * 2002-06-07 2004-02-26 Fujikura Ltd 一次被覆層及び二次被覆層を備えた光ファイバ、光ファイバケーブル、及びその製造方法
WO2008012926A1 (fr) * 2006-07-28 2008-01-31 The Furukawa Electric Co., Ltd. Fibre optique
US20130330050A1 (en) * 2011-02-15 2013-12-12 Ls Cable & System Ltd. Bend-insensitive optical fiber having small coating diameter and optical cable comprising the same
JP2015219271A (ja) * 2014-05-14 2015-12-07 住友電気工業株式会社 光ファイバ
JP2016519333A (ja) * 2013-03-28 2016-06-30 コーニング インコーポレイテッド 低い曲げ損失を有する大きな有効面積のファイバ
WO2018159146A1 (ja) * 2017-03-03 2018-09-07 住友電気工業株式会社 光ファイバ
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
WO2020054753A1 (ja) * 2018-09-13 2020-03-19 古河電気工業株式会社 光ファイバ心線及び光ファイバケーブル

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JPH0611634A (ja) 1992-06-25 1994-01-21 Furukawa Electric Co Ltd:The 細径光ファイバ心線
US6804442B1 (en) 2002-06-07 2004-10-12 Fujikura Ltd. Optical fiber and optical fiber cable having a first jacket layer and a second jacket layer and a coefficient of thermal expansion selecting method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03155510A (ja) * 1989-08-10 1991-07-03 Furukawa Electric Co Ltd:The 光ファイバ心線
US20030215196A1 (en) * 2000-11-22 2003-11-20 Dsm N.V. Coated optical fibers
WO2002066390A1 (fr) * 2001-02-20 2002-08-29 Sumitomo Electric Industries, Ltd. Fibre optique revetue, bande centrale de fibre optique utilisant cette derniere et ensemble de fibre optique
JP2004059420A (ja) * 2002-06-07 2004-02-26 Fujikura Ltd 一次被覆層及び二次被覆層を備えた光ファイバ、光ファイバケーブル、及びその製造方法
WO2008012926A1 (fr) * 2006-07-28 2008-01-31 The Furukawa Electric Co., Ltd. Fibre optique
US20130330050A1 (en) * 2011-02-15 2013-12-12 Ls Cable & System Ltd. Bend-insensitive optical fiber having small coating diameter and optical cable comprising the same
JP2016519333A (ja) * 2013-03-28 2016-06-30 コーニング インコーポレイテッド 低い曲げ損失を有する大きな有効面積のファイバ
JP2015219271A (ja) * 2014-05-14 2015-12-07 住友電気工業株式会社 光ファイバ
WO2018159146A1 (ja) * 2017-03-03 2018-09-07 住友電気工業株式会社 光ファイバ
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
WO2020054753A1 (ja) * 2018-09-13 2020-03-19 古河電気工業株式会社 光ファイバ心線及び光ファイバケーブル

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