WO2017199494A1 - 光ファイバユニット及び光ファイバケーブル - Google Patents
光ファイバユニット及び光ファイバケーブル Download PDFInfo
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- WO2017199494A1 WO2017199494A1 PCT/JP2017/005476 JP2017005476W WO2017199494A1 WO 2017199494 A1 WO2017199494 A1 WO 2017199494A1 JP 2017005476 W JP2017005476 W JP 2017005476W WO 2017199494 A1 WO2017199494 A1 WO 2017199494A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- bundle
- bundle material
- materials
- winding direction
- Prior art date
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Classifications
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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
- G02B6/441—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
- G02B6/4403—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
-
- 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 an optical fiber unit and an optical fiber cable.
- a technique for constructing an optical fiber cable using an optical fiber assembly in which a plurality of optical fiber cores are bundled as an optical fiber unit is known. At that time, by winding the coarsely wound yarn (bundle material) around the bundle of optical fiber cores, the optical fiber unit is identified by the color of the bundle material while preventing the bundle of optical fiber cores from being separated. The method is common.
- Patent Document 1 when the periphery of a bundle of a plurality of optical fiber cores is bundled with two bundle materials, the two bundle materials are formed in an SZ shape.
- Patent Document 2 includes three or more bundle members that bundle a plurality of optical fiber core wires, and the first bundle member is joined to the second bundle member at a contact point that contacts the second bundle member. And is joined to the third bundle material at a contact point that contacts the third bundle material, and the optical fiber core wire at the contact point with the second bundle material and the contact point with the third bundle material.
- a technique for reversing the winding direction of a bundle of paper is disclosed.
- the present invention aims to suppress twisting at the reversal point in the winding direction of the bundle material.
- a main invention for achieving the above object includes an optical fiber bundle in which a plurality of optical fiber cores are bundled and a plurality of bundle members, and one bundle member of the plurality of bundle members is the optical fiber bundle.
- the winding material is wound along the longitudinal direction of the optical fiber bundle while alternately reversing the winding direction on the outer periphery of the optical fiber bundle, and is joined to another bundle material at a reversal point in the winding direction.
- the optical fiber unit is characterized in that the width with respect to the thickness in the cross section is less than 20 times.
- FIG. 1A is a cross-sectional view of an optical fiber cable 1 having an optical fiber unit 2.
- FIG. 1B is a perspective view of an optical fiber unit 2 of a reference example.
- FIG. 2 is an explanatory view of the intermittently fixed type optical fiber tape 7.
- FIG. 3 is a diagram for explaining a cross-sectional structure of the bundle material 10 in the case of performing bonding by heat fusion.
- 4A to 4C are cross-sectional views of the bundle material 10 for explaining the cross-sectional shape of the bundle material 10.
- FIG. 5 is an explanatory diagram for explaining how to wind the bundle material 10.
- FIG. 6 is an enlarged perspective view of the vicinity of the junction 15 of the bundle material 10 in the comparative example.
- FIG. 7 is a perspective view of a joint portion of the bundle material 10 that is erected and joined at a reversal point in the winding direction of the bundle material 10.
- FIG. 8 is a diagram for explaining the optical fiber unit 2 in which the optical fiber core wire 8 has jumped out.
- FIG. 9 is a diagram for explaining the optical fiber unit 2 of the second embodiment.
- FIG. 10A is a development view of the bundle material 10 for explaining the exposed area of the optical fiber core wire.
- FIG. 10B is a development view of another bundle material 10 for explaining the exposed area of the optical fiber core wire.
- An optical fiber bundle in which a plurality of optical fiber cores are bundled and a plurality of bundle members are provided, and one bundle member of the plurality of bundle members reverses the winding direction alternately on the outer periphery of the optical fiber bundle. While being wound along the longitudinal direction of the optical fiber bundle, it is joined to another bundle material at a reversal point in the winding direction, and the width relative to the thickness in the cross section of the bundle material is less than 20 times.
- An optical fiber unit characterized by According to such an optical fiber unit, it is possible to suppress twisting at a reversal point in the winding direction of the bundle material.
- the width with respect to the thickness in the cross section of the bundle material is 18 times or less. Thereby, it is possible to further suppress twisting at the reversal point in the winding direction of the bundle material.
- the bundle materials are joined with an adhesive. In such a case, it is particularly advantageous.
- the area where the optical fiber core wire is exposed from the bundle material on the outer periphery of the optical fiber bundle is 150 A / N square mm. The following is desirable. Thereby, in the bending part of an optical fiber unit, it is possible to suppress the optical fiber core wire from jumping out from a gap surrounded by bundle materials.
- an area where the optical fiber core wire is exposed from the bundle material on the outer periphery of the optical fiber bundle is 10 square mm or more. Thereby, it is possible to suppress that the water stop characteristic of a bundle material falls.
- An optical fiber cable including a plurality of optical fiber units and a jacket covering the plurality of optical fiber units, wherein the optical fiber unit includes an optical fiber bundle in which a plurality of optical fiber cores are bundled, and a plurality of optical fiber bundles.
- the bundle material is wound along the longitudinal direction of the optical fiber bundle while alternately inverting the winding direction on the outer periphery of the optical fiber bundle.
- FIG. 1A is a cross-sectional view of an optical fiber cable 1 having an optical fiber unit 2.
- the optical fiber cable 1 has a plurality of optical fiber units 2 and a jacket 3.
- the optical fiber unit 2 has a structure in which a plurality of optical fiber core wires 8 are bundled with a bundle material 10. The detailed structure of the optical fiber unit 2 will be described later.
- the optical fiber cable 1 has three optical fiber units 2.
- the three optical fiber units 2 are covered with a press-wound tape 5, and the outer sides thereof are covered with a jacket 3.
- a tension member 4A and a lip cord 4B are embedded in the jacket 3.
- FIG. 1B is a perspective view of an optical fiber unit 2 of a reference example.
- the optical fiber unit 2 has a structure in which a bundle of a plurality of optical fiber core wires 8 is bundled with a bundle material 10.
- a bundle of a plurality of optical fiber core wires 8 is referred to as an optical fiber bundle 6.
- the bundle material 10 is wound around the outer periphery of the optical fiber bundle 6, whereby a plurality of optical fiber core wires 8 are bundled so as not to fall apart.
- the optical fiber bundle 6 is configured by bundling a plurality of intermittently fixed optical fiber tapes 7.
- FIG. 2 is an explanatory view of the intermittently fixed type optical fiber tape 7.
- the intermittently fixed optical fiber tape 7 is an optical fiber tape 7 in which a plurality (here, 12) of optical fiber core wires 8 are intermittently connected in parallel. Two adjacent optical fiber core wires 8 are connected by a connecting portion 9A. Between the two adjacent optical fiber core wires 8, a plurality of connecting portions 9A are intermittently arranged in the longitudinal direction. The plurality of connecting portions 9A of the intermittently fixed optical fiber tape 7 are intermittently arranged two-dimensionally in the longitudinal direction and the tape width direction. A region other than the connecting portion 9A between the adjacent two optical fiber core wires 8 is a non-connecting portion 9B.
- the adjacent two optical fiber core wires 8 are not restrained.
- the intermittently fixed optical fiber tape 7 can be rolled into a cylindrical shape (bundle shape) or folded, and a large number of optical fiber core wires 8 can be bundled at high density.
- the intermittently fixed optical fiber tape 7 constituting the optical fiber bundle 6 is not limited to that shown in the figure.
- the arrangement of the connecting portion 9A may be changed.
- the number of optical fiber cores 8 constituting the intermittently fixed optical fiber tape 7 may be changed.
- the optical fiber bundle 6 may not be constituted by the intermittently fixed type optical fiber tape 7, and may be constituted by bundling a plurality of single-core optical fibers 8 for example.
- Bundle material 10 is a member for bundling a plurality of optical fiber core wires 8.
- the bundle material 10 is a thread-like, string-like or tape-like member capable of binding a plurality of optical fiber core wires 8.
- the bundle material 10 is wound around the outer periphery of the optical fiber bundle 6.
- the bundle material 10 of the optical fiber unit 2 may be four or more.
- subscripts (A to D) may be added to the bundle material 10 to distinguish each bundle material 10 from each other.
- Bundle material 10 is colored with a predetermined color and also functions as an identification member.
- the bundle material 10 of each optical fiber unit 2 is colored in a different color and can be identified.
- each optical fiber unit 2 can be identified by a combination of colors of the bundle members 10. Further, instead of coloring the bundle material 10, an identification mark may be printed on the surface of the bundle material 10.
- an adhesive is used.
- an adhesive used when the bundle members 10 are bonded to each other for example, a modified olefin-based adhesive using an ultraviolet curable resin or a solvent, or a reactive adhesive such as an epoxy-based adhesive may be used. it can. Further, the joining of the bundle members 10 may be performed by heat fusion instead of using an adhesive.
- FIG. 3 is a diagram for explaining a cross-sectional structure of the bundle material 10 in the case of performing bonding by thermal fusion.
- the bundle material 10 includes a core portion 11 and a covering portion 12.
- the core part 11 is a member extending in the longitudinal direction of the optical fiber unit 2, and the bundle material 10 has a plurality of core parts 11.
- the covering portion 12 is a member that covers the outer periphery of the core portion 11 and has a melting point lower than the melting point of the core portion 11.
- the two bundle members 10 that bundle the optical fiber units 2 are heat-sealed at the intersection between the two due to the adhesiveness that is developed when the covering portion 12 is heated to the melting point or higher.
- the difference between the melting point of the core part 11 and the melting point of the covering part 12 is preferably 20 ° C. or more.
- the melting point of the core part 11 is preferably 200 to 230 ° C.
- the melting point of the covering part 12 is preferably 150 to 180 ° C. Further, it is desirable that the coating portion 12 does not adhere to the optical fiber 8 even when heated and melted, or does not deteriorate the coating layer of the optical fiber 8 even if it adheres.
- FIG. 4A to 4C are cross-sectional views of the bundle material 10 for explaining the cross-sectional shape of the bundle material 10.
- the cross-sectional shape of the bundle material 10 can be various shapes.
- FIG. 4A shows a case where the cross-sectional shape of the bundle material 10 is a substantially square shape.
- FIG. 4B shows the case where the cross-sectional shape of the bundle material 10 is a shape in which the substantially rectangular corner portions shown in FIG. 4A are rounded.
- FIG. 4C shows a case where the cross-sectional shape of the bundle material 10 is a substantially circular shape (including an elliptical shape).
- the length of the shortest portion in the cross section is the thickness T
- the length of the longest portion in the direction orthogonal to the thickness direction is the width W.
- 4A to 4C show the case where the bundle material 10 is wound around the optical fiber bundle 6 without standing, but the above definition does not change even when the bundle material 10 is raised as described later. .
- FIG. 5 is an explanatory diagram for explaining how to wind the bundle material 10.
- a method of winding the bundle material 10 around the optical fiber bundle 6 will be described with reference to FIG. 1B.
- the bundle material 10 is arranged so as to draw an arc of a half circumference (180 degrees) along the longitudinal direction of the optical fiber unit 2 so as to wrap around the outer circumference of the optical fiber bundle 6.
- the bundle material 10 is joined to another bundle material 10 at the joining point 15. Further, the winding direction of the bundle material 10 with respect to the optical fiber bundle 6 is reversed at the junction 15 with the other bundle material 10. Thereby, the bundle material 10 is wound around the optical fiber bundle 6 in an SZ shape.
- a subscript AD is added to the junction 15 between the bundle material 10A and the bundle material 10D
- a subscript BC is added to the junction 15 between the bundle material 10B and the bundle material 10C.
- the junction point 15 may be described separately.
- the bundle material 10 is wound along the longitudinal direction of the optical fiber bundle 6 while alternately reversing the winding direction on the outer periphery of the optical fiber bundle 6. It is joined with. Thereby, if the junction point at the reversal point is separated, the bundle material 10 covering the outer periphery of the optical fiber bundle 6 in a net shape can be opened, and the optical fiber core wire 8 can be taken out from the optical fiber unit 2.
- the bonding strength of the bonding point 15 is such that the bonding point 15 is not destroyed unexpectedly and can be easily separated by the operator's hand. Since it is desirable that the force necessary for separating the joining point 15 of the bundle material 10 is smaller than the force required for cutting the bundle material 10, the joint strength of the bundle material 10 may be equal to or less than the breaking strength of the bundle material 10. desirable. Further, it is desirable that the two bundle members 10 can be joined again by applying an adhesive or heating with a heater after taking out the optical fiber 8 in an intermediate branching operation.
- the junction 15 is disposed so as to sandwich the optical fiber bundle 6.
- the position of one joining point 15 is defined as a reference position (0 degree), and the position of the other joining point is defined as 180 degrees.
- the junction point 15AD and the junction point 15BC exist at both the reference position and the 180 ° position.
- the bundle material 10A is wound clockwise on the outer periphery of the optical fiber bundle 6 (see the upper diagram in FIG. 5), and is joined to the bundle material 10D at the joining point 15AD (see the upper diagram in FIG. 5).
- the outer periphery of the fiber bundle 6 is wound counterclockwise (refer to the center diagram in FIG. 5), and is joined to the bundle material D at the junction 15AD (refer to the center diagram in FIG. 5). Wrapping (see the lower figure in FIG. 5 (or the upper figure in FIG. 5)), this is repeated.
- the bundle material 10D is wound counterclockwise on the outer periphery of the optical fiber bundle 6 (see the upper diagram in FIG. 5), and is joined to the bundle material 10A at the joining point 15AD (see the upper diagram in FIG. 5). Then, the outer periphery of the optical fiber bundle 6 is wound clockwise (see the center diagram in FIG. 5), and is joined to the bundle material 10A at the junction 15AD (see the center diagram in FIG. 5). Wound clockwise (see the lower figure in FIG. 5 (or the upper figure in FIG. 5)) and repeat this. In this way, as shown in FIG. 1B, the bundle material 10A and the bundle material 10D are wound around the optical fiber bundle 6 in an SZ shape. Also, as shown in FIG. 5, when the optical fiber unit 2 is viewed from one side in the longitudinal direction, two joint points 15AD are arranged so as to sandwich the optical fiber bundle 6 (the joint points 15AD are 0 degrees and 180 degrees). Is placed in the position).
- the bundle material 10B and the bundle material 10C are wound around the optical fiber bundle 6 in an SZ shape as shown in FIG. 1B.
- FIG. 5 when the optical fiber unit 2 is viewed from one side in the longitudinal direction, two joint points 15BC are arranged so as to sandwich the optical fiber bundle 6 (the joint points 15BC are 0 degrees and 180 degrees). Is placed in the position).
- FIG. 6 is an enlarged perspective view of the vicinity of the junction 15 of the bundle material 10 in the comparative example.
- the bundle material 10 is illustrated for ease of explanation, and the optical fiber bundle 6 is not illustrated.
- the winding direction of the bundle material 10 wound in the SZ shape is reversed at a joint point 15 with another bundle material 10.
- a bending stress M is generated in the bundle material 10.
- the bending stress M is a general term for two stresses, ie, a compressive stress inside the bend and a tensile stress outside the bend, with reference to the center line of the bundle material 10 indicated by a broken line in FIG.
- the bending stress generated in a member generally varies depending on the cross-sectional shape. That is, the ease of bending of the member depends on the cross-sectional shape. It is also generally known that members having different thicknesses and widths, such as a rectangular cross-section, have different bendability depending on the ratio of the width to the thickness.
- the bending becomes harder as the width W becomes larger than the thickness T. If the bundle material 10 is bent in the width direction when the width W is greater than a certain value with respect to the thickness T, stress may not be borne only by bending deformation of the member. At this time, the compressive stress and the tensile stress act in the twist direction, and as a result, the bundle material 10 may be twisted and deformed.
- FIG. 7 is a perspective view of a joint portion of the bundle material 10 that is erected and joined at a reversal point in the winding direction of the bundle material 10.
- the compressive stress acts on the optical fiber bundle 6 in the rising direction
- the tensile stress acts on the optical fiber bundle 6 in the longitudinal direction, whereby the bundle material 10 is twisted, and as a result, the inverted portion of the bundle material 10 stands up. Will be joined. Since the joint portion between the bundle members 10 standing up in this way entrains the optical fiber cores of the other optical fiber bundles 6, the optical fiber cores may be bent largely locally, thereby causing an increase in transmission loss. is there. Moreover, there is a possibility of causing the disconnected optical fiber core wire to be broken.
- each of the plurality of prototype optical fiber units 80 optical fiber cores are assembled, and the bundle material is wound in an SZ shape.
- the method for winding the bundle material is the same as that shown in FIGS. 1B and 5.
- a bundle of prototype optical fiber units is bundled between optical fiber bundles in other optical fiber units. It was evaluated whether or not the joint part was involved. The evaluation results are as shown in Table 1 below.
- each evaluation result column shows the ratio of the width of the bundle material to the thickness of the bundle material.
- this ratio is referred to as a width-thickness ratio.
- ⁇ indicates that the optical fiber unit is not involved in rotation when another optical fiber unit is brought into contact
- X indicates that the optical fiber unit is involved in rotation. If the result is “ ⁇ ”, it can be evaluated as a good optical fiber unit in which the standing is suppressed to such an extent that the optical fiber core wire is not entangled by the joint between the bundle materials.
- the prototype optical fiber unit having a width-thickness ratio of less than 20.0 is evaluated as “ ⁇ ”.
- the one with the largest width-thickness ratio is a prototype optical fiber unit having a width of 1.80 mm and a thickness of 0.10 mm, and the width-thickness ratio is 18 .0. Therefore, from the above results, the optical fiber unit having a width-to-thickness ratio of less than 20.0, preferably 18.0 or less, is prevented from standing up to such an extent that the optical fiber core wire is not entangled by the joint portion between the bundle materials. It is a good optical fiber unit.
- the joining of the bundle members 10 may be performed using an adhesive or by heat fusion.
- the bundle material is more likely to be twisted at the reversal point in the winding direction in the case of bonding using an adhesive than in the case of thermal fusion. This is presumably because in the case of heat fusion, the covering portion 12 (see FIG. 3) of the bundle material 10 melts and becomes slightly deformable, which makes it easier to bend. Therefore, the optical fiber unit within the above numerical range is particularly advantageous when bonded using an adhesive.
- the optical fiber core wire may protrude from the gap surrounded by the bundle materials.
- the protruding portion of the optical fiber core wire is locally bent by being wound around another optical fiber unit or a bundle material, resulting in an increase in transmission loss and breakage of the optical fiber core wire.
- FIG. 8 is a diagram for explaining the optical fiber unit 2 in which the optical fiber core wire 8 has jumped out.
- FIG. 8 for ease of explanation, only one of the plurality of bundle members 10 is shown, and the other bundle members 10 joined to the bundle members 10 are not shown.
- subscripts (A, B) may be added to the optical fiber core wire 8 for explanation.
- a line length difference occurs in the trajectory of each of the optical fiber core wires 8 from the S point to the E point.
- the length of the trajectory of the optical fiber core 8 (A) passing through the inside of the bend is shorter than that of the optical fiber core 8 (B) passing through the outside of the bend.
- the optical fiber core wire 8 (A) passes through a trajectory that eliminates the difference in wire length from the optical fiber core wire 8 (B) because the bundle material 10 is wound and restrained. That is, the optical fiber core wire 8 (A) meanders and accumulates the wire length difference, and tries to eliminate the wire length difference from the optical fiber core wire 8 (B).
- the difference in the line length cannot be eliminated only by meandering, and the accumulation of the line length difference appears at a stretch. It may jump out of the enclosed gap.
- FIG. 9 is a diagram for explaining the optical fiber unit 2 of the second embodiment. As shown in FIG. 9, jumping out of the optical fiber core wire 2 can be suppressed by increasing the number of bundle members and shortening the winding pitch. This is presumably because the portion where the bundle material 10 is not wound, that is, the exposed area of the optical fiber core wire is reduced, and as a result, the jump-out of the optical fiber core wire 2 is suppressed.
- FIG. 10A is a development view of the bundle material 10 for explaining the exposed area of the optical fiber core wire.
- FIG. 10A shows a state in which the outer circumferential surface of the optical fiber bundle 6 is virtually a circumferential surface, and the bundle material 10 wound around the outer circumference of the optical fiber bundle 6 is developed.
- the bundle material 10 is wound along the longitudinal direction of the optical fiber bundle while alternately reversing the winding direction on the outer periphery of the optical fiber bundle 6, and joined with another bundle material 10 at the reversal point in the winding direction.
- the exposed area in this example is the area of a region surrounded by bundles as indicated by the hatched portion in FIG. 10A.
- FIG. 10B is a development view of another bundle material 10 for explaining the exposed area of the optical fiber core wire.
- four bundle members 10 are arranged and joined to the bundle member 10 not only at the place where the winding direction is reversed, but also at the intersection where the other bundle member 10 intersects.
- the exposed area in this example is the area of a region surrounded by bundles as indicated by the hatched portion in FIG. 10B.
- an optical fiber bundle using 80 cores of an 8-fiber intermittently fixed tape core and a bundle material having a thickness of 0.08 mm and a width of 1.4 mm were prepared.
- a plurality of prototype optical fiber units were produced in which the exposed area was changed by changing the winding pitch of the bundle material with respect to the bundle material whose number was changed from 2 to 8.
- Each prototype optical fiber unit was bent to evaluate whether or not the optical fiber core wire would jump out. The evaluation results are as shown in Table 2 below.
- the optical fiber cable In the optical fiber cable, water may enter the optical fiber cable depending on the application environment. The invaded water travels through the optical fiber cable and reaches a connection box such as a closure, and may affect other optical fiber cables through the connection box. Therefore, the optical fiber cable is required to have good waterproof properties.
- the waterproof performance in the optical fiber unit may be improved by applying a water-stopping material to the surface of the press-wound tape 5 shown in FIG. 1A on the optical fiber unit 2 side. At this time, if the area of the region surrounded by the bundle materials, that is, the exposed area is smaller than a certain value, the water-stopping material may be blocked by the bundle material and not spread in the optical fiber unit. As a result, the water stop characteristic may be deteriorated.
- the length of the prototype optical fiber cable was 40 m, and water was injected with a head length of 1 m from the end face of the optical fiber cable, and the test time was 240 hours.
- evaluation water artificial seawater in which 24.5 g of sodium chloride and 11.1 g of magnesium chloride hexahydrate were dissolved per liter of water was used. The evaluation results are as shown in Table 4 below.
- the number of bundle members 10 wound around the optical fiber bundle 6 is four has been described.
- the number of bundle members 10 provided in one optical fiber unit 2 is not limited to this. For example, it may be 6 or more or an odd number.
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- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
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Abstract
Description
<光ファイバユニット2等の構成>
図1Aは、光ファイバユニット2を有する光ファイバケーブル1の断面図である。光ファイバケーブル1は、複数の光ファイバユニット2と、外被3とを有する。光ファイバユニット2は、複数の光ファイバ心線8をバンドル材10で束ねた構造である。光ファイバユニット2の詳しい構造については、後述する。ここでは、光ファイバケーブル1は、3本の光ファイバユニット2を有する。3本の光ファイバユニット2は押え巻きテープ5によって覆われており、その外側を外被3で被覆されている。外被3には、テンションメンバ4Aやリップコード4Bが埋設されている。
図6は、比較例におけるバンドル材10の接合点15付近を拡大した斜視図である。なお、図6においては説明を容易にするためにバンドル材10のみを図示し、光ファイバ束6を図示していない。図6に示すように、SZ状に巻き付けられたバンドル材10は、別のバンドル材10との接合点15において巻き付け方向が反転している。バンドル材10の巻き付け方向を反転させるとき、バンドル材10には曲げ応力Mが発生している。曲げ応力Mは、図6の破線で示すバンドル材10の中心線を基準として、曲げの内側では圧縮応力、曲げの外側では引張応力の2つの応力の総称である。
(バンドル材接合部による巻き込み特性の評価)
バンドル材10同士の接合部による光ファイバ心線の巻き込みは、バンドル材の厚さTに対して幅Wがある一定以上の場合にバンドル材同士の接合部が起立することにより引き起こされる。そこで、バンドル材の断面寸法について試作光ファイバユニットを複数作成し、バンドル材10同士の接合部による巻き込み特性の評価を実施した。
バンドル材10同士の接合は、接着剤を用いて行われる場合と、熱融着によって行われる場合があると述べた。このうち、熱融着による場合と比較して、接着剤を用いて接合される場合の方が、巻き付け方向の反転箇所においてバンドル材に捻じれが発生しやすい。これは、熱融着の場合はバンドル材10の被覆部12(図3参照)が溶けてやや変形しやすくなるため、より曲げやすくなるためと考えられる。したがって、上述の数値範囲での光ファイバユニットは、接着剤を用いて接合される場合、特に有利である。
<光ファイバ心線の飛び出しについて>
上述の参考例において、光ファイバユニットに曲げが加えられたとき、バンドル材同士で囲まれた隙間から光ファイバ心線が飛び出してしまうことがある。この光ファイバ心線の飛び出し部分が他の光ファイバユニットや、バンドル材に巻き込まれることにより、局所的に曲げられ、伝送損失の増加や光ファイバ心線の破断を引き起こしていた。
<光ファイバ心線の露出面積について>
光ファイバ心線の飛び出しは、露出面積がある一定以上の場合に引き起こされる。そこで、露出面積について試作光ファイバユニットを複数作成し、光ファイバ心線の飛び出し特性の評価を実施した。
[数1]
S ≦ 1200/N (式1)
[数2]
S ≦ 150A/N (式2)
光ファイバケーブルは、適用環境によっては光ファイバケーブル内に水が浸入することがある。侵入した水は光ファイバケーブル内を伝ってクロージャ等の接続箱に到達し、その接続箱を介して他の光ファイバケーブルへ影響を与える可能性がある。そのため、光ファイバケーブルは良好な防水特性が求められる。一般的に、図1Aに示す押え巻きテープ5の光ファイバユニット2側の面に止水材料を塗布するなどにより、光ファイバユニット内の防水性能を高めることがある。このとき、バンドル材同士で囲まれた領域の面積、つまり露出面積がある一定の値より小さいと、止水材料がバンドル材に阻まれて光ファイバユニット内に行き渡らなくなることがある。その結果、止水特性が低下してしまうことがある。
[数3]
10 ≦ S ≦ 150A/N (式3)
上述の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明は、その趣旨を逸脱することなく、変更・改良され得ると共に、本発明には、その等価物が含まれることは言うまでもない。
上述の実施形態では、光ファイバ束6に巻き付けられるバンドル材10の数が4本の例について説明されていた。しかし、1つの光ファイバユニット2に設けられるバンドル材10の数はこの限りではない。例えば、6本以上であったり、奇数本であったりしてもよい。
4A テンションメンバ、4B リップコード、5 押え巻きテープ、
6 光ファイバ束、7 間欠固定型光ファイバテープ、
8 光ファイバ心線、9A 連結部、9B 非連結部、
10 バンドル材、
15 接合部
Claims (6)
- 複数の光ファイバ心線を束ねた光ファイバ束と、複数のバンドル材を備え、
前記複数のバンドル材のうちの一つのバンドル材は、
前記光ファイバ束の外周上で、巻き付け方向を交互に反転させながら、前記光ファイバ束の長手方向に沿って巻き付けられているとともに、
巻き付け方向の反転箇所において、他のバンドル材と接合されており、
前記バンドル材の断面における厚さに対する幅が20倍未満である
ことを特徴とする光ファイバユニット。 - 請求項1に記載の光ファイバユニットであって、
前記バンドル材の断面における厚さに対する幅が18倍以下である
ことを特徴とする光ファイバユニット。 - 請求項1又は2に記載の光ファイバユニットであって、
前記バンドル材同士は、接着剤により接合されている
ことを特徴とする光ファイバユニット。 - 請求項1又は2に記載の光ファイバユニットであって、
前記光ファイバ心線の心数をA、前記バンドル材の本数をNとしたときに、
前記光ファイバ束の外周上で前記光ファイバ心線が前記バンドル材から露出する面積が150A/N平方mm以下である
ことを特徴とする光ファイバユニット。 - 請求項4に記載の光ファイバユニットであって、
前記光ファイバ束の外周上で前記光ファイバ心線が前記バンドル材から露出する面積が10平方mm以上である
ことを特徴とする光ファイバユニット。 - 複数の光ファイバユニットと、複数の前記光ファイバユニットを被覆する外被とを備えた光ファイバケーブルであって、
前記光ファイバユニットは、複数の光ファイバ心線を束ねた光ファイバ束と、複数のバンドル材を備え、
前記複数のバンドル材のうちの一つのバンドル材は、
前記光ファイバ束の外周上で、巻き付け方向を交互に反転させながら、前記光ファイバ束の長手方向に沿って巻き付けられているとともに、
巻き付け方向の反転箇所において、他のバンドル材と接合されており、
前記バンドル材の断面における厚さに対する前記断面における幅が20倍未満である
ことを特徴とする光ファイバケーブル。
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CN201780019335.XA CN108885322A (zh) | 2016-05-20 | 2017-02-15 | 光纤单元以及光缆 |
US16/092,952 US10488610B2 (en) | 2016-05-20 | 2017-02-15 | Optical fiber unit and optical fiber cable |
EP17798932.4A EP3422063A4 (en) | 2016-05-20 | 2017-02-15 | GLASS FIBER UNIT AND FIBER CABLE |
AU2017265961A AU2017265961B2 (en) | 2016-05-20 | 2017-02-15 | Optical fiber unit and optical fiber cable |
CA3018669A CA3018669C (en) | 2016-05-20 | 2017-02-15 | Optical fiber unit and optical fiber cable |
SG11201809907VA SG11201809907VA (en) | 2016-05-20 | 2017-02-15 | Optical fiber unit and optical fiber cable |
KR1020187020402A KR101968453B1 (ko) | 2016-05-20 | 2017-02-15 | 광섬유 유닛 및 광섬유 케이블 |
SA518400285A SA518400285B1 (ar) | 2016-05-20 | 2018-10-22 | وحدة ألياف ضوئية وكبل ألياف ضوئية |
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US6088499A (en) * | 1997-09-30 | 2000-07-11 | Siecor Corporation | Fiber optic cable with ripcord |
US7742667B2 (en) * | 2005-06-08 | 2010-06-22 | Commscope, Inc. Of North Carolina | Fiber optic cables and methods for forming the same |
JP2007010917A (ja) * | 2005-06-29 | 2007-01-18 | Sumitomo Electric Ind Ltd | 光ファイバユニット、光ファイバユニットの製造方法並びに光ファイバケーブル |
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CN204832591U (zh) | 2015-05-29 | 2015-12-02 | 中央电视台 | 一种光缆 |
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CA3018669C (en) | 2019-01-29 |
KR101968453B1 (ko) | 2019-04-11 |
US20190121042A1 (en) | 2019-04-25 |
JP2017207707A (ja) | 2017-11-24 |
CN108885322A (zh) | 2018-11-23 |
KR20180087434A (ko) | 2018-08-01 |
JP6138999B1 (ja) | 2017-05-31 |
EP3422063A4 (en) | 2019-09-25 |
AU2017265961A1 (en) | 2018-10-25 |
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CA3018669A1 (en) | 2017-11-23 |
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