WO2023127524A1 - 光ファイバ集合体及び光ケーブル - Google Patents

光ファイバ集合体及び光ケーブル Download PDF

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Publication number
WO2023127524A1
WO2023127524A1 PCT/JP2022/046215 JP2022046215W WO2023127524A1 WO 2023127524 A1 WO2023127524 A1 WO 2023127524A1 JP 2022046215 W JP2022046215 W JP 2022046215W WO 2023127524 A1 WO2023127524 A1 WO 2023127524A1
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WO
WIPO (PCT)
Prior art keywords
optical fiber
units
average
fiber assembly
optical
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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/JP2022/046215
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English (en)
French (fr)
Japanese (ja)
Inventor
大典 佐藤
格 石田
健 大里
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.)
Fujikura Ltd
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Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to EP22915748.2A priority Critical patent/EP4459341A4/en
Priority to CN202280085645.2A priority patent/CN118475864A/zh
Priority to CA3242299A priority patent/CA3242299A1/en
Priority to JP2023570839A priority patent/JP7716505B2/ja
Priority to US18/724,327 priority patent/US20250067947A1/en
Publication of WO2023127524A1 publication Critical patent/WO2023127524A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/44—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
    • 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
    • G02B6/441—Optical cables built up from sub-bundles
    • 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
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • 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
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G02B6/4433—Double reinforcement laying in straight line with optical transmission element

Definitions

  • the present invention relates to optical fiber assemblies and optical cables. This application claims priority based on Japanese Patent Application No. 2021-212141 filed in Japan on December 27, 2021, the content of which is incorporated herein.
  • an optical fiber unit (tape fiber unit) is configured by stacking and bundling a plurality of optical fiber tapes, and a cable core (optical fiber assembly) is provided by assembling a plurality of the optical fiber units.
  • a fiber optic cable (optical cable) is disclosed.
  • an optical cable having the above-described optical fiber assembly is manufactured without any measures, if the optical cable is bent or if the jacket of the optical cable shrinks in a low-temperature environment, the optical fibers of a specific optical fiber unit may be damaged. Stresses (mainly bending stresses) are often concentrated. There is a problem that when stress concentrates on a specific optical fiber, the transmission loss of the optical fiber increases.
  • the present invention has been made in view of the circumstances described above, and an object of the present invention is to provide an optical fiber assembly capable of suppressing an increase in transmission loss of optical fibers and an optical cable including the same.
  • An optical fiber assembly is an optical fiber assembly configured by bundling a plurality of optical fiber units each formed by laminating a plurality of optical fiber tapes, and the longitudinal direction of the optical fiber assembly is A plurality of optical fiber units in the optical fiber unit so that the tape surface of at least one of the optical fiber tapes constituting the optical fiber unit is curved in the cross section of the optical fiber assembly orthogonal to the longitudinal direction at least at a certain position of The laminated state of the optical fiber tape is broken, and the plurality of inner layer fibers positioned radially inside the optical fiber assembly in the cross section of the optical fiber assembly perpendicular to the longitudinal direction are included in the plurality of optical fiber units.
  • the average value of the sine values sin ⁇ of a plurality of optical fiber tapes in the same optical fiber unit is defined as the average sine value sin ⁇ ave .
  • the average sine value sin ⁇ ave in the outer layer fiber unit is 0.366 or more in at least a cross section of the optical fiber assembly orthogonal to the longitudinal direction at a certain position in the longitudinal direction of the optical fiber assembly.
  • An optical cable according to a second aspect of the present invention comprises the optical fiber assembly of the first aspect and a jacket that accommodates the optical fiber assembly inside.
  • FIG. 1 is a schematic cross-sectional view of an optical cable including an optical fiber assembly according to this embodiment
  • FIG. 2 is a perspective view schematically showing an optical fiber unit included in the optical fiber assembly of FIG. 1
  • FIG. 3 is a perspective view schematically showing an optical fiber tape included in the optical fiber unit of FIG. 2
  • 3 is a diagram showing an example of a cross-sectional shape of the optical fiber unit of FIG. 2
  • FIG. 3 is a cross-sectional view schematically showing a first arrangement example of a plurality of optical fiber units in an optical fiber assembly according to the present embodiment
  • FIG. 4 is a cross-sectional view schematically showing a second arrangement example of a plurality of optical fiber units in an optical fiber assembly
  • FIG. 3 is a diagram showing an angle ⁇ formed by a radial straight line R1 connecting the center C of the optical fiber assembly and the center of gravity G of the optical fiber tape, and a tape width straight line W1 connecting both ends of the optical fiber tape.
  • FIG. 10 is a table of experimental examples showing the relationship between the average sine value sin ⁇ ave of a plurality of optical fiber units and the amount of increase in transmission loss of optical fibers;
  • FIG. 9 is a graph showing the relationship between the average sine value sin ⁇ ave of a plurality of optical fiber units and the increase in transmission loss of the optical fiber corresponding to the table of FIG. 8;
  • the optical fiber assembly 2 of this embodiment constitutes a part of the optical cable 1.
  • the optical cable 1 of this embodiment is a so-called slotless type optical cable that does not have a slot rod in which a groove (slot) for accommodating an optical fiber is formed.
  • the optical cable 1 has an optical fiber assembly 2 and a jacket 3 .
  • the optical fiber assembly 2 is configured by bundling a plurality of optical fiber units 11 .
  • the optical fiber unit 11 is a structure in which a plurality of optical fibers 13 are bundled. A specific structure of the optical fiber unit 11 will be described later.
  • the optical fiber assembly 2 of this embodiment constitutes the core of the optical cable 1 .
  • the core of the optical cable 1 of this embodiment further has a pressing tape 5 covering the plurality of optical fiber units 11 .
  • the pressing tape 5 may be made of, for example, a water absorbing tape.
  • the pressing tape 5 constitutes the internal space of the optical fiber assembly 2 in which the plurality of optical fiber units 11 are arranged.
  • the above-described pressing tape 5 may be omitted.
  • the inner surface of the jacket 3, which will be described later forms the inner space of the optical fiber assembly 2. As shown in FIG.
  • the jacket 3 is formed in a tubular shape.
  • the optical fiber assembly 2 is housed inside the jacket 3 .
  • a plurality of optical fiber units 11 may be accommodated inside the jacket 3 in a state of being twisted in one direction or in an SZ shape, for example.
  • an intervening material (not shown) may be accommodated inside the jacket 3 .
  • the inclusions may be, for example, absorbent materials.
  • the inclusions may be placed inside, outside, or both of the hold-down tape 5 .
  • the inclusions described above may be absent, for example.
  • the outer shape of the optical fiber assembly 2 in a cross section orthogonal to the longitudinal direction of the optical cable 1 may be any shape. , which is substantially circular in this embodiment.
  • the substantially circular shape includes not only a perfect circular shape but also an elliptical shape, an oval shape, and the like.
  • the outer shape of the optical fiber assembly 2 in the cross section described above may be, for example, a rectangular shape.
  • the jacket 3 is a member that covers the optical fiber assembly 2 .
  • the inner surface of the jacket 3 forms a space for accommodating the optical fiber assembly 2 .
  • the inner surface of the jacket 3 has a substantially circular shape corresponding to the optical fiber assembly 2 in a cross section perpendicular to the longitudinal direction of the optical cable 1 .
  • the cross-sectional shape of the inner surface of the jacket 3 may be rectangular, for example.
  • a pressing tape 5 wrapping a plurality of optical fiber units 11 is housed inside the jacket 3 .
  • a tension member 7 is arranged on the jacket 3 .
  • the entire tension member 7 may be arranged inside the jacket 3 , or part of the tension member 7 may be arranged inside the jacket 3 and the rest of the tension member 7 may be exposed from the jacket 3 . .
  • Other elements may be arranged on the jacket 3, for example ripcords.
  • a plurality of tension members 7 are arranged so as to sandwich the optical fiber assembly 2 in a cross section orthogonal to the longitudinal direction of the optical cable 1 .
  • the plurality of tension members 7 are arranged so as to face each other with the optical fiber assembly 2 interposed therebetween in the first direction orthogonal to the longitudinal direction.
  • the other tension members are arranged so as to face each other with the optical fiber assembly 2 interposed therebetween in a second direction orthogonal to both the longitudinal direction and the first direction. is not arranged, but is not limited to this, and other tension members may be arranged so as to face each other with the optical fiber assembly 2 interposed therebetween in the second direction.
  • Each tension member 7 extends in the longitudinal direction of the optical cable 1 .
  • Each tension member 7 may be arranged parallel to the longitudinal direction of the optical fiber assembly 2, or may be arranged spirally with the optical fiber assembly 2 as the center. Also, each tension member 7 may be included inside the optical fiber assembly 2, for example.
  • two tension members 7 are set as one set, and a pair of sets are arranged on both sides of the optical fiber assembly 2, but the arrangement is not limited to this.
  • a set of three or more tension members 7 may be arranged on both sides of the optical fiber assembly 2 , or one tension member 7 may be arranged on each side of the optical fiber assembly 2 .
  • the plurality of tension members 7 forming a set are spaced apart, but they may be in contact with each other, for example. Also, a plurality of tension members 7 forming a set may be twisted.
  • the optical fiber unit 11 of this embodiment has a structure in which a plurality of optical fibers 13 are bundled with a filamentary body 20 (bundle material).
  • the filamentary body 20 is wound around the outer circumference of the plurality of optical fibers 13 to prevent the plurality of optical fibers 13 from separating from each other.
  • the optical fiber unit 11 may have a structure in which a plurality of optical fibers 13 are bundled by twisting them without using the filamentous body 20, for example.
  • the optical fiber unit 11 of this embodiment is configured by bundling a plurality of optical fiber tapes 12 each having a plurality of optical fibers 13 .
  • the optical fiber unit 11 may include the optical fiber tape 12 and the optical fiber 13 that is not formed into a tape.
  • the optical fiber 13 has a glass body including a core and a clad, and a coating layer covering the glass body.
  • the coating layer may include a colored layer for identifying the optical fiber 13 .
  • the diameter of the glass body is, for example, 125 ⁇ m, and the diameter of the coating layer (that is, the diameter of the optical fiber 13) is, for example, 200-250 ⁇ m.
  • the diameter of the glass body can vary and may be less than 125 ⁇ m, such as 60 ⁇ m, 80 ⁇ m, 100 ⁇ m.
  • the diameter of the coating layer may also vary, eg 160 ⁇ m, 180 ⁇ m, 200 ⁇ m, etc., and may be 200 ⁇ m or less.
  • the optical fiber tape 12 is configured by arranging a plurality of optical fibers 13 in parallel and connecting the adjacent optical fibers 13 to each other.
  • the direction in which the optical fibers 13 extend may be called the longitudinal direction of the optical fiber tape 12
  • the direction in which the plurality of optical fibers 13 are arranged may be called the width direction of the optical fiber tape 12.
  • the direction orthogonal to the longitudinal direction and the width direction of the optical fiber tape 12 is defined as the thickness direction of the optical fiber tape 12, and the surface facing the thickness direction is sometimes called the tape surface.
  • the optical fiber tape 12 of this embodiment is an intermittently connected optical fiber tape in which a plurality of (12 in FIG. 3) optical fibers 13 are arranged in parallel and intermittently (partially) connected. Two adjacent optical fibers 13 are connected by a connecting portion 14A. Between two adjacent optical fibers 13, a plurality of connecting portions 14A are arranged at intervals in the longitudinal direction of the optical fiber tape 12. As shown in FIG. Also, a connection portion 14A connecting a predetermined optical fiber 13 and an optical fiber 13 adjacent to one side of the optical fiber 13, and a predetermined optical fiber 13 and the optical fiber 13 adjacent to the other side of the optical fiber 13. The connection portion 14A that connects the .
  • the plurality of connecting portions 14A are intermittently arranged two-dimensionally in the longitudinal direction and width direction of the optical fiber tape 12 .
  • a region of two adjacent optical fibers 13 that are not connected by the connecting portion 14A is a non-connecting portion 14B. Two adjacent optical fibers 13 are not constrained in the non-connecting portion 14B.
  • the intermittently connected optical fiber tape 12 is not limited to the one illustrated in FIG.
  • the arrangement pattern of the intermittently arranged connecting portions 14A does not have to be a constant pattern.
  • a plurality (for example, two) of the optical fibers 13 are arranged as one set, and the plurality of sets are arranged side by side, and the optical fibers 13 of the adjacent sets are connected by the connecting portion 14A. You may connect intermittently.
  • the optical fibers 13 adjacent to each other in the optical fiber tape 12 may be separated from each other or may be in contact with each other.
  • the number of optical fibers 13 in the optical fiber tape 12 is generally a multiple of 4 (4 cores, 8 cores, 12 cores, 16 cores), but is not limited to this.
  • the number of optical fibers 13 in the optical fiber tape 12 may be odd, for example.
  • the optical fiber tape 12 is flexibly deformable in its width direction.
  • the optical fiber tape 12 can be deformed so that one tape surface is curved.
  • the optical fiber tape 12 can be deformed such that its tape surface is uneven in the width direction (to meander in the width direction).
  • the intermittently connected optical fiber tape 12 has remarkable flexibility in the width direction, the characteristics of the optical fiber 13 are less likely to deteriorate even if it is mounted at high density.
  • the filamentous body 20 that bundles the plurality of optical fiber tapes 12 is a flexible thread-like, string-like, or tape-like member.
  • the filamentary body 20 is wrapped around the outer circumference of the bundle of the plurality of optical fiber tapes 12 .
  • a plurality of optical fiber tapes 12 may be bundled by, for example, one or three or more filaments 20 .
  • a plurality of optical fiber tapes 12 are bundled by two filamentary bodies 20 .
  • the plurality of optical fiber tapes 12 are not limited to being bundled by winding the filamentous body 20, but may be bundled by, for example, being inserted into a flexible tube or winding a flexible film.
  • the two filaments 20 may be helically wound around the bundle of the optical fiber tape 12 .
  • the two filamentous bodies 20 are wound around the bundle of the optical fiber tape 12 in an SZ shape. That is, the winding direction of each filament body 20 is reversed so that each filament body 20 can be wound around the bundle of the optical fiber tape 12 by half the circumference.
  • the two filamentous bodies 20 are joined together at positions where the winding directions thereof are reversed.
  • Reference numeral 21 in FIG. 2 indicates a joint portion of the two filamentary bodies 20 .
  • the joining of the two filamentous bodies 20 may be performed by, for example, heat welding or adhesion.
  • the filamentary body 20 is attached so as to follow the outline of the bundle of the optical fiber tapes 12 . Therefore, the outer shape of the bundle of optical fiber tapes 12 can be maintained. As a result, it is possible to hold a plurality of optical fiber tapes 12 even in a state in which the laminated state is broken (described later).
  • the optical fiber unit 11 is configured by bundling a plurality of optical fiber tapes 12 in a laminated state with a filamentary body 20 .
  • the laminated state of the bundled optical fiber tapes 12 is broken. "The lamination state of the plurality of optical fiber tapes 12 is collapsed" is a state different from the state in which the plurality of optical fiber tapes 12 are not bent in the width direction and are laminated with the tape surface flat. It means that the tape surface of at least one optical fiber tape 12 constituting the optical fiber unit 11 is curved in the width direction.
  • the middle points of the optical fibers 13 at both ends in the width direction of the optical fiber tape 12 and the optical fiber tape 12 It means that the center of gravity (that is, the geometric center) is shifted.
  • the plurality of optical fiber tapes 12 whose laminated state is broken are all curved or meandering in the width direction.
  • the plurality of optical fiber tapes 12 forming the same optical fiber unit 11 are bundled by the filamentous body 20, so that the laminated state of the plurality of optical fiber tapes 12 is broken.
  • the outer shape of the optical fiber unit 11 shown in FIG. The state in which the laminated state of the plurality of optical fiber tapes 12 is collapsed may be established, for example, at any position (or all positions) in the longitudinal direction of the optical fiber unit 11 (optical fiber assembly 2).
  • 11 optical fiber assembly 2 at least at a certain position in the longitudinal direction.
  • FIGS. 5 and 6 the area where the optical fiber unit 11 whose lamination state is broken is schematically displayed in an elliptical shape.
  • the direction of the long axis of each ellipse generally corresponds to the width direction of the optical fiber tape 12 .
  • the direction of the short axis of each ellipse generally corresponds to the stacking direction of the plurality of optical fiber tapes 12 .
  • the plurality of optical fiber units 11 are arranged in the radial direction of the optical fiber assembly 2 (in FIGS. 5 and 6, the center (geometric center) of the optical fiber assembly 2).
  • a plurality of fiber unit layers 10 arranged in the radial direction of the optical fiber assembly 2 are formed by stacking layers in a direction perpendicular to the center line passing through the optical fiber assembly 2 .
  • the number of fiber unit layers 10 in FIGS. 5 and 6 is, for example, three.
  • the two fiber unit layers 10 located radially inside the optical fiber assembly 2 are the inner layers 10A (10A-1, 10A-2), and the one located radially outside.
  • the fiber unit layer 10 is the outer layer 10B (or the outermost layer 10B).
  • the two inner layers 10A include a first inner layer 10A-1 and a second inner layer 10A-2 positioned radially outwardly of the first inner layer 10A-1.
  • the plurality of optical fiber units 11 included in the inner layer 10A are the plurality of inner layer fiber units 11A located radially inside the optical fiber assembly 2.
  • the plurality of inner layer fiber units 11A are positioned, for example, including the center of the optical fiber assembly 2 or positioned near the center.
  • the plurality of optical fiber units 11 included in the outer layer 10B are the outer layer fiber units 11B located radially outside the optical fiber assembly 2 from the inner layer fiber units 11A.
  • the outer layer fiber unit 11B is included in the outermost fiber unit layer 10 (outer layer 10B).
  • the arrangement (orientation) of the inner layer fiber units 11A and the outer layer fiber units 11B in the cross section of the optical fiber assembly 2 perpendicular to the longitudinal direction will be described.
  • the index indicating the orientation of each optical fiber unit 11 in the cross section of the optical fiber assembly 2 will be described with reference to FIG.
  • the center C of the optical fiber assembly 2 and the center of gravity G of the predetermined optical fiber tape 12 in the predetermined optical fiber unit 11 are connected.
  • the straight line be a radial straight line R1.
  • a straight line connecting both ends of a predetermined optical fiber tape 12 of a predetermined optical fiber unit 11 (optical fibers 13 positioned at both ends in the width direction of the optical fiber tape 12) is defined as a tape width direction straight line W1.
  • the direction of the predetermined optical fiber tape 12 included in the predetermined optical fiber unit 11 is determined by the angle ⁇ (0° ⁇ ⁇ 180°).
  • the width direction (or tape surface) of the optical fiber tape 12 is the circumferential direction (Fig. 5 and 6 are arranged along the direction around the center of the optical fiber assembly 2).
  • the sine value sin ⁇ indicating the orientation of the optical fiber tape 12 is small (close to 0)
  • the optical fiber tape 12 is arranged so that its width direction (or tape surface) is along the radial direction of the optical fiber assembly 2. be done.
  • the orientation of the optical fiber unit 11 in the cross section orthogonal to the longitudinal direction is represented by the average value of the sine values sin ⁇ of the plurality of optical fiber tapes 12 in the same optical fiber unit 11 (average sine value sin ⁇ ave ). That is, the average sine value sin ⁇ ave represents the average of the directions in which the plurality of optical fiber tapes 12 constituting the same optical fiber unit 11 are facing.
  • the fact that the average sine value sin ⁇ ave indicating the orientation of the optical fiber unit 11 is large means that the lamination direction of the plurality of optical fiber tapes 12 in the optical fiber unit 11 is in the radial direction of the optical fiber assembly 2. (or close to the radial direction).
  • the fact that the average sine value sin ⁇ ave indicating the orientation of the optical fiber unit 11 is small means that the lamination direction of the plurality of optical fiber tapes 12 in the optical fiber unit 11 is the circumferential direction of the optical fiber assembly 2. (or close to the circumferential direction).
  • the average of the average sine values sin ⁇ ave in all the inner layer fiber units 11A is called the “inner index”, while the average of the average sine values sin ⁇ ave in all the outer layer fiber units 11B is called the “outer index”. call.
  • the inner index is preferably smaller than the outer index.
  • the fact that the inner index is smaller than the outer index means that the width direction of the optical fiber tape 12 in the inner layer fiber unit 11A is the same as the width direction of the optical fiber tape 12 in the outer layer fiber unit 11B, as in the first arrangement example shown in FIG. In comparison, it means that the angle of the optical fiber assembly 2 with respect to the circumferential direction tends to increase.
  • at least some of the plurality of inner layer fiber units 11A are arranged such that the width direction of the optical fiber tape 12 faces the radial direction of the optical fiber assembly 2 compared to the outer layer fiber units 11B. do.
  • the plurality of inner layer fiber units 11A are arranged such that the width direction of the optical fiber tape 12 faces various directions when viewed from the center of the optical fiber assembly 2 compared to the outer layer fiber units 11B. I can say Further, in the first arrangement example shown in FIG. It is the thinnest among all the constituent optical fiber units 11 .
  • the angle of the width direction of the optical fiber tapes 12 forming the inner layer fiber unit 11A with respect to the circumferential direction of the optical fiber assembly 2 is the optical fiber tapes 12 forming the outer layer fiber unit 11B. is about the same as the angle in the width direction of the That is, in the second arrangement example shown in FIG. 6, the average sine value sin ⁇ ave in the inner layer fiber unit 11A is approximately the same as the average sine value sin ⁇ ave in the outer layer fiber unit 11B. In other words, there is no difference between the inner and outer indices.
  • the above two contents are It does not have to be true at all positions, but at least at certain positions in the longitudinal direction.
  • the above two conditions may be established, for example, in a section (certain section) of the optical fiber assembly 2 orthogonal to the longitudinal direction at a certain position within each twist pitch (one pitch) in the longitudinal direction. That is, in a cross section different from the certain cross section described above within the range of the twist pitch, the above two contents do not have to be established. Note that the above two conditions may be established over the entire longitudinal direction of the optical fiber assembly 2, for example.
  • the above twist pitch (1 pitch) is the longitudinal length for the spirally arranged optical fiber units 11 to make one turn in the circumferential direction when the plurality of optical fiber units 11 are twisted in one direction. is. Further, when a plurality of optical fiber units 11 are twisted in an SZ shape, the twist pitch (one pitch) is the length in the longitudinal direction between the position where the twist direction is reversed and the next position where the twist direction is reversed in the same direction. (interval). That is, the twist pitch (1 pitch) is the length of one section in the S direction plus one section in the Z direction.
  • the optical cable 1 of this embodiment When manufacturing the optical cable 1 of this embodiment, first, as illustrated in FIG. prepare. In order to break the laminated state of the plurality of optical fiber tapes 12 when preparing the optical fiber unit 11, for example, by narrowing the laminated plurality of optical fiber tapes 12 in the width direction, the optical fiber tapes 12 are reduced in width. It should be deformed with respect to the direction. Next, an assembly forming step of bundling the plurality of optical fiber units 11 to form the optical fiber assembly 2 is carried out.
  • the average sine value sin ⁇ ave of the outer layer fiber units 11B is 0.366 or more.
  • the outer layer fiber unit 11B may be arranged so as to In order to dispose the outer layer fiber units 11B in this manner, for example, it is necessary to wait until the plurality of optical fiber units 11 reach the gathering point (the position of the optical fiber units 11 when the configuration of the optical fiber assembly 2 is completed). In between, the orientation of the outer layer fiber unit 11B may be adjusted. Further, in the assembly forming step, the inner layer fiber units 11A and the outer layer fiber units 11B may be arranged so that the inner index is smaller than the outer index at least in a certain section of the optical fiber assembly 2, for example.
  • the average sine of the outer layer fiber units 11B is The inner layer fiber unit 11A and the outer layer fiber unit 11B may be arranged so that the value sin ⁇ ave is 0.366 or more and the inner index is smaller than the outer index.
  • the assembly forming process described above may be performed, for example, when a plurality of optical fiber units 11 are housed inside the jacket 3 (see FIG. 1). may be done prior to placement in the By housing the optical fiber assembly 2 (a plurality of bundled optical fiber units 11) inside the jacket 3, the manufacture of the optical cable 1 is completed.
  • the average sine value sin ⁇ ave in the outer layer fiber unit 11B is 0.366 or more. This can suppress an increase in transmission loss of the optical fiber 13 in the outer layer fiber unit 11B. This point will be described below with reference to experimental examples shown in FIGS.
  • the experimental example table shown in FIG. 8 shows the relationship between the average sine value sin ⁇ ave of the 12 optical fiber units 11 and the increase in transmission loss of the optical fiber 13 .
  • the "unit numbers" in FIG. 8 correspond to the 12 optical fiber units 11, respectively.
  • the first to third optical fiber units 11 are inner layer fiber units 11A
  • the fourth to 12th optical fiber units 11 are outer layer fiber units 11B.
  • the "tape numbers" in FIG. 8 correspond to the six optical fiber tapes 12 that each optical fiber unit 11 has.
  • the sine values sin ⁇ of all (72) optical fiber tapes 12 constituting the optical fiber assembly 2 are shown in association with the optical fiber units 11 .
  • the sine value sin ⁇ of the first optical fiber tape 12 in the first optical fiber unit 11 is 0.80.
  • the sine value sin ⁇ of each optical fiber tape 12 is based on the angle ⁇ (see FIG. 7) of each optical fiber tape 12 measured at any five cross sections within the twist pitch in the longitudinal direction of the optical fiber assembly 2.
  • “Average sin ⁇ ” in FIG. 8 is the average value of the sine values sin ⁇ of the six optical fiber tapes 12 forming the same optical fiber unit 11 (that is, the average sine value sin ⁇ ave ).
  • “Loss increase” in FIG. 8 indicates the maximum transmission loss increase of the optical fiber 13 (hereinafter simply referred to as "loss increase”) measured by the following measuring method. In the measurement method for measuring the amount of loss increase in transmission of the optical fiber 13, first, a mandrel having a diameter 20 times the diameter of the optical cable 1 is prepared.
  • the optical cable 1 is pressed against the outer circumference of the mandrel and bent 90° (+90°), and then the bent direction and A bending step is performed in which the optical cable 1 is pressed against the outer circumference of the mandrel in the opposite direction and bent 90° ( ⁇ 90°).
  • the increase in transmission loss of the optical fiber 13 of the optical cable 1 at three bending angles of 0°, +90°, and -90° when the bending process was repeated 25 times was measured using light with a wavelength of 1.55 ⁇ m (GR-20- CORE Issue 4, 6.5.8 compliant).
  • the graph shown in FIG. 9 is a graph showing the relationship between the average sine value sin ⁇ ave of the optical fiber unit 11 and the increase in transmission loss of the optical fiber 13 in the experimental example shown in FIG.
  • the graph of FIG. 9 shows plotted points of three inner layer fiber units 11A (first to third optical fiber units 11 in the table of FIG. 8) and approximate straight lines based on these three plotted points.
  • Plot points of nine outer layer fiber units 11B optical fiber units 11 Nos. 4 to 12 in the table of FIG. 8) and approximate straight lines based on these nine plot points are also shown.
  • both the inner layer fiber unit 11A and the outer layer fiber unit 11B have a smaller average sine value sin ⁇ ave (that is, the optical fiber group
  • the width direction of the optical fiber tape 12 constituting the optical fiber unit 11 is arranged along the radial direction of the optical cable 1 (that is, the average sine value sin ⁇ ave is small).
  • the optical fiber tape 12 is bent from the neutral line of the optical cable 1 (the axial line where no compression or expansion occurs when the optical cable 1 is bent).
  • the optical fiber 13 located farthest is subjected to a large stress (bending stress) due to a large stretching strain compared to the other optical fibers 13 of the optical fiber tape 12 . Therefore, in the optical fiber unit 11 having a small average sine value sin ⁇ ave , the increase in transmission loss of the optical fiber 13 becomes large.
  • the width direction of the optical fiber tape 12 constituting the optical fiber unit 11 is arranged along the circumferential direction of the optical fiber aggregate 2 (that is, the case where the average sine value sin ⁇ ave is large).
  • the optical fiber unit 11 having a large average sine value sin ⁇ ave has a small increase in transmission loss of the optical fiber 13 .
  • the tendency that the transmission loss increase amount increases as the average sine value sin ⁇ ave decreases is that of the outer layer fiber unit 11B. is stronger than the inner layer fiber unit 11A. This means that the bending stress acting on the optical fiber 13 when the optical cable 1 is bent increases as the optical fiber unit 11 is located farther from the neutral line of bending of the optical cable 1 . From the graph of FIG. 9, it can be seen that the increase in the transmission loss of the optical fiber 13 in the outer layer fiber unit 11B can be suppressed by increasing the average sine value sin ⁇ ave in the outer layer fiber unit 11B.
  • X is the average sine value sin ⁇ ave
  • Y is the loss increase.
  • the loss increase of the optical fiber 13 can be suppressed to 0.15 dB/km or less by setting the average sine value sin ⁇ ave to 0.366 or less based on the above formula. That is, it is possible to suppress an increase in transmission loss of the optical fiber 13 in the outer layer fiber unit 11B.
  • the inner index is smaller than the outer index.
  • the average sine value sin ⁇ ave of the three inner layer fiber units 11A is 0.66
  • the average sine value sin ⁇ ave of the outer layer fiber units 11B (4th to 12th optical fiber units 11) is 0.79.
  • the inner layer fiber unit 11A can be arranged in a direction different from that of the outer layer fiber unit 11B.
  • the width direction of the optical fiber tape 12 forming the inner layer fiber unit 11A is greater than the width direction of the optical fiber tape 12 forming the outer layer fiber unit 11B.
  • the inner layer fiber unit 11A can be arranged so as to be closer to the fiber assembly 2 in the radial direction.
  • the inner layer fiber unit 11A is arranged such that the width direction of the optical fiber tape 12 constituting the inner layer fiber unit 11A faces the circumferential direction like the outer layer fiber unit 11B.
  • the inner-layer fiber units 11A so that the average sine value sin ⁇ ave of the inner-layer fiber units 11A is small, the increase in the transmission loss of the optical fibers 13 in the inner-layer fiber units 11A is suppressed, and the plurality of optical fibers It is possible to improve the utilization efficiency of the internal space of the optical fiber assembly in which the units are arranged.
  • the laminated state of the plurality of optical fiber tapes 12 in the optical fiber unit 11 is broken, so that the cross-sectional shape of the optical fiber unit 11 is changed to that of the plurality of optical fibers. It can be different between units 11 .
  • This makes it easier to arrange the plurality of optical fiber units 11 in the internal space of the optical fiber assembly 2 without gaps. Therefore, it is possible to improve the utilization efficiency of the internal space of the optical fiber assembly 2 in which the plurality of optical fiber units 11 are arranged.
  • the optical fiber tape 12 forming the optical fiber unit 11 meanders in its width direction.
  • the degree of freedom of relative movement of the plurality of optical fibers 13 forming the same optical fiber tape 12 is increased. Therefore, when the optical fiber assembly 2 is bent or the like, the adjacent optical fibers 13 in the same optical fiber tape 12 can move so as to relax the bending stress acting on the optical fiber unit 11 . . Therefore, an increase in transmission loss of the optical fiber 13 can be suppressed.
  • the optical fiber unit 11 is configured by bundling a plurality of optical fiber tapes 12 in a laminated state with the filamentous body 20 . Therefore, it is possible to suppress or prevent the entire circumference of the optical fiber unit 11 (the plurality of optical fiber tapes 12) from being covered, compared to the case where the plurality of optical fiber tapes 12 are bundled with a tube. Therefore, compared to the case where the optical fiber tapes 12 are bundled with a tube, when the optical fiber assembly 2 is bent, the bundled optical fiber tapes 12 and the optical fibers 13 constituting the bundled optical fiber tapes 12 are free.
  • the optical fiber assembly 2 when the optical fiber assembly 2 is bent, the optical fiber tape 12 and the optical fibers 13 constituting the same optical fiber unit 11 are bent so as to relax the bending stress acting on the optical fiber unit 11. can move to each other. Therefore, an increase in transmission loss of the optical fiber 13 can be suppressed.
  • the outer layer fiber unit 11B is not limited to being included only in the outermost fiber unit layer 10 (the outermost layer 10B in FIGS. 5 and 6), but for example, the outermost layer and the outermost layer may be included in one or more layers adjacent radially inwardly of the
  • the fiber unit layer 10 including the outer layer fiber units 11B may include, for example, a second inner layer 10A-2 in addition to the outer layer 10B in FIGS.
  • the inner layer 10A is composed of two layers in the above embodiment, it may be composed of one layer or three or more layers, for example.
  • the present invention is not limited to being applied to slotless optical cables, but may be applied to slotted optical cables having slot rods, for example.
  • an optical fiber aggregate may be accommodated in each slot.
  • the optical fiber unit is divided into an inner layer and an outer layer in each slot, the same effect can be obtained by applying the relationship between the inner layer fiber unit and the outer layer fiber unit in the above embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
PCT/JP2022/046215 2021-12-27 2022-12-15 光ファイバ集合体及び光ケーブル Ceased WO2023127524A1 (ja)

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EP22915748.2A EP4459341A4 (en) 2021-12-27 2022-12-15 FIBER OPTIC AND OPTICAL CABLE ASSEMBLY
CN202280085645.2A CN118475864A (zh) 2021-12-27 2022-12-15 光纤集合体及光缆
CA3242299A CA3242299A1 (en) 2021-12-27 2022-12-15 Optical fiber assembly and optical cable
JP2023570839A JP7716505B2 (ja) 2021-12-27 2022-12-15 光ケーブル用の光ファイバ集合体及び光ケーブル
US18/724,327 US20250067947A1 (en) 2021-12-27 2022-12-15 Optical fiber assembly and optical cable

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JP2021212141 2021-12-27

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JP7716505B2 (ja) 2025-07-31
US20250067947A1 (en) 2025-02-27
TWI856460B (zh) 2024-09-21
TW202343052A (zh) 2023-11-01
EP4459341A4 (en) 2025-11-26
CN118475864A (zh) 2024-08-09

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