WO2022085598A1 - 光ファイバテープ心線 - Google Patents
光ファイバテープ心線 Download PDFInfo
- Publication number
- WO2022085598A1 WO2022085598A1 PCT/JP2021/038299 JP2021038299W WO2022085598A1 WO 2022085598 A1 WO2022085598 A1 WO 2022085598A1 JP 2021038299 W JP2021038299 W JP 2021038299W WO 2022085598 A1 WO2022085598 A1 WO 2022085598A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- core wire
- fiber core
- coating layer
- core wires
- Prior art date
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 319
- 239000011247 coating layer Substances 0.000 claims description 84
- 239000010410 layer Substances 0.000 claims description 37
- 239000000835 fiber Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000011347 resin Substances 0.000 description 29
- 229920005989 resin Polymers 0.000 description 29
- 238000011156 evaluation Methods 0.000 description 22
- 238000002474 experimental method Methods 0.000 description 20
- 238000005259 measurement Methods 0.000 description 17
- 238000012986 modification Methods 0.000 description 15
- 230000004048 modification Effects 0.000 description 15
- 230000004927 fusion Effects 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000007526 fusion splicing Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- 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
- G02B6/4404—Multi-podded
-
- 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 disclosure relates to an optical fiber tape core wire.
- This application claims priority based on Japanese Application No. 2020-175368 filed on October 19, 2020, and incorporates all the contents described in the Japanese application.
- the optical fiber tape core wire of the present disclosure is Multiple optical fiber core wires arranged in parallel in the direction orthogonal to the longitudinal direction, A collective covering layer that covers the outer periphery of each of the plurality of optical fiber core wires is provided.
- the collective covering layer includes a connecting portion for connecting adjacent optical fiber core wires in at least a part of the plurality of optical fiber core wires.
- the outer diameters of the plurality of optical fiber core wires are 215 ⁇ m or less, respectively.
- the dynamic frictional force of the collective coating layer is 0.3 N or less.
- FIG. 1 is a cross-sectional view of an optical fiber tape core wire according to the first embodiment of the present disclosure.
- FIG. 2 is a cross-sectional view of the optical fiber core wire of the optical fiber tape core wire shown in FIG.
- FIG. 3 is a schematic view showing the relationship between the pitch of the optical fiber tape core wire according to the first embodiment in the fusion step and the V groove of the fusion machine.
- FIG. 4 is a cross-sectional view of the optical fiber tape core wire according to the modified example 1.
- FIG. 5 is a diagram showing a part of the optical fiber tape core wire according to the second modification in the longitudinal direction.
- FIG. 6 is a cross-sectional view of the optical fiber tape core wire shown in FIG. FIG.
- FIG. 7 is a cross-sectional view of the optical fiber tape core wire according to the modified example 3.
- FIG. 8 is a cross-sectional view of the optical fiber core wire of the optical fiber tape core wire shown in FIG. 7.
- FIG. 9 is a cross-sectional view of the optical fiber tape core wire used in the evaluation experiment.
- FIG. 10 is a schematic diagram of a dynamic friction force measurement experiment used in the evaluation experiment.
- FIG. 11 is a cross-sectional view of the optical fiber tape core wire used in the evaluation experiment.
- the optical fiber tape cores When the optical fiber tape cores are mounted on the optical fiber cable at high density, the optical fiber cores tend to come into contact with each other, so that friction may occur between the optical fiber cores. When such friction occurs unevenly in the longitudinal direction of the cable, the cable may easily meander. Furthermore, the transmission characteristics of the cable at low temperatures tended to deteriorate. In particular, when the outer diameters of the plurality of optical fiber core wires are different from each other, the cable is more likely to meander and the transmission characteristics are more likely to be deteriorated.
- the present disclosure provides an optical fiber tape core wire capable of mounting an optical fiber core wire at a high density on an optical fiber cable and less likely to cause cable meandering.
- the optical fiber tape core wire according to one aspect of the present disclosure is Multiple optical fiber core wires arranged in parallel in the direction orthogonal to the longitudinal direction, A collective covering layer that covers the outer periphery of each of the plurality of optical fiber core wires is provided.
- the collective covering layer includes a connecting portion for connecting adjacent optical fiber core wires in at least a part of the plurality of optical fiber core wires.
- the outer diameters of the plurality of optical fiber core wires are 215 ⁇ m or less, respectively.
- the dynamic frictional force of the collective coating layer is 0.3 N or less.
- the dynamic frictional force of the collective coating layer of the optical fiber tape core wire is 0.3 N or less, the friction generated between the adjacent optical fiber tape core wires can be reduced. Therefore, even when the optical fiber tape core wire is mounted on the cable at high density, the cable meandering can be suppressed. Furthermore, the transmission characteristics of the cable at low temperatures can be ensured. Since the outer diameter of each optical fiber core wire of the optical fiber tape core wire of the present disclosure is 215 ⁇ m or less, it can be mounted on a cable at high density.
- the surface hardness of the collective coating layer may be 1.2 GPa or more and 3 GPa or less. According to the present disclosure, since the surface hardness of the batch coating layer is 1.2 GPa or more and 3 GPa or less, it is possible to reduce meandering between adjacent optical fiber tape core wires. Therefore, even when the optical fiber tape core wire is mounted on the cable at high density, the cable meandering can be suppressed. Furthermore, the transmission characteristics of the cable at low temperatures can be ensured.
- the distance between the centers of the adjacent optical fiber core wires may be 220 ⁇ m or more and 280 ⁇ m or less. According to the present disclosure, since the distance between the centers of adjacent optical fiber core wires is 220 ⁇ m or more and 280 ⁇ m or less, general connection equipment can be used. Even if the diameter of each optical fiber core wire is reduced, it is not necessary to prepare a connection device dedicated to the diameter reduction, so that it is possible to provide a versatile optical fiber tape core wire.
- the collective covering layer may include a non-connected portion in which at least a part of the plurality of optical fiber core wires is not connected to the adjacent optical fiber core wires.
- the connecting portion may be formed intermittently in the longitudinal direction. According to the present disclosure, since the non-connecting portion is provided intermittently in the longitudinal direction, the optical fiber tape core wire is easily deformed in the cross section perpendicular to the longitudinal direction. Therefore, the optical fiber core wire can be mounted at high density on the optical fiber cable.
- the batch coating layer has a thick portion and at least two thin portions in which the thickness of the batch coating layer is thinner than the thickness of the batch coating layer in the thick portion. And may be provided.
- the difference between the thickness of the collective coating layer in the thick portion and the thickness of the collective coating layer in the thin portion may be 5 ⁇ m or more and 19 ⁇ m or less.
- the collective coating layer includes a thick portion and at least two thin-walled portions, and the thickness of the collective coating layer is non-uniform.
- the difference between the thickness of the collective coating layer in the thick portion and the thickness of the collective coating layer in the thin portion is relatively large, 5 ⁇ m or more and 19 ⁇ m or less, the contact area between the optical fiber tape core wires can be reduced. Therefore, friction is less likely to occur between the adjacent optical fiber tape core wires, and even when the optical fiber tape core wires are mounted at high density on the cable, the cable meandering can be further suppressed.
- the plurality of optical fiber core wires may have a first optical fiber core wire having a first outer diameter and a second optical fiber core wire having a second outer diameter. According to the present disclosure, since the plurality of optical fiber tape core wires have a first optical fiber core wire having a first outer diameter and a second optical fiber core wire having a second outer diameter, the cable. It is possible to mount an optical fiber core wire at a high density on an optical fiber cable while suppressing meandering. (Effect of this disclosure)
- an optical fiber tape core wire capable of mounting an optical fiber core wire at a high density on an optical fiber cable and less likely to cause cable meandering.
- FIG. 1 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber tape core wire 1A according to one embodiment of the present disclosure.
- the optical fiber tape core wire 1A includes a plurality of optical fiber core wires 11 and a batch covering layer 20 that covers the plurality of optical fiber core wires 11.
- the 12-core optical fiber core wires 11A to 11L are arranged in parallel in the direction orthogonal to the longitudinal direction of the optical fiber tape core wire 1A.
- the plurality of optical fiber core wires 11 are arranged at regular intervals for each core.
- the outer periphery of each of the plurality of optical fiber core wires 11 is covered with the collective coating layer 20, and the whole is connected by the collective coating layer 20.
- each optical fiber core 11 includes, for example, a glass fiber 12 having a core and a clad, a primary resin layer 13 that covers the outer periphery of the glass fiber 12, and a secondary resin layer 14 that covers the outer periphery of the primary resin layer 13.
- the glass fiber 12 may include pure quartz glass, quartz glass to which germanium is added, and quartz glass to which fluorine is added.
- the primary resin layer 13 may contain a soft material having a relatively low Young's modulus as a buffer layer.
- the secondary resin layer 14 may contain a hard layer having a relatively high Young's modulus as a protective layer.
- the Young's modulus of the primary resin layer 13 is preferably 0.04 MPa or more and 0.8 MPa or less, more preferably 0.05 MPa or more and 0.7 MPa or less, and 0.05 MPa or more and 0.6 MPa or less at 23 ° C. It is more preferable to have. Since the Young's modulus of the primary resin layer 13 is 0.04 MPa or more and 0.8 MPa or less, voids (voids) are less likely to occur in the optical fiber core wire.
- the Young's modulus of the secondary resin layer 14 is preferably 900 MPa or more, more preferably 1000 MPa or more, and even more preferably 1200 MPa or more at 23 ° C.
- the Young's modulus of the secondary resin layer 14 may be 3000 MPa or less, 2500 MPa or less, 2000 MPa or less, or 1800 MPa or less at 23 ° C. Since the Young's modulus of the secondary resin layer 14 is 900 MPa or more, it is easy to improve the lateral pressure resistance characteristics. When the Young's modulus of the secondary resin layer 14 is 3000 MPa or less, it is easy to remove the coating because it has an appropriate breaking elongation.
- the collective covering layer 20 includes a connecting portion 21 for connecting adjacent optical fiber core wires in at least a part of the plurality of optical fiber core wires 11.
- the connecting portion 21 is arranged between all the adjacent optical fiber core wires.
- the connecting portion 21 is arranged so that the distance P between the centers of the adjacent optical fiber core wires is 220 ⁇ m or more and 280 ⁇ m or less.
- the batch coating layer 20 may contain, for example, an ultraviolet curable resin.
- the dynamic frictional force of the collective covering layer 20 is 0.3 N or less.
- the surface hardness of the batch coating layer 20 is 1.2 GPa or more and 3 GPa or less.
- the Young's modulus of the collective coating layer 20 is preferably 50 MPa or more and 900 MPa or less, and more preferably 100 MPa or more and 800 MPa or less at 23 ° C. from the viewpoint of pressure resistance measurement characteristics and flexibility of the optical fiber tape core wire.
- FIG. 2 is a cross-sectional view of one optical fiber core wire 11B among the plurality of optical fiber core wires 11 included in the optical fiber tape core wire 1A shown in FIG. Since the configurations of the other optical fiber core wires 11A and 11C to 11L are the same as the configurations of the optical fiber core wires 11B shown in FIG. 2, repeated description will be omitted.
- the thickness of the collective coating layer 20 is uniform on the outer periphery of the optical fiber core wire 11B.
- the thickness of the collective coating layer 20 is, for example, 20 ⁇ m or less.
- the thickness of the collective coating layer between the optical fiber core wire 11B and the optical fiber core wire 11A or 11C means the thickness excluding the connecting portion 21.
- FIG. 3 is a schematic diagram showing the relationship between the pitch of the optical fiber tape core wire 1A (distance P between the centers of the adjacent optical fiber core wires) and the V-groove base 30 of the fusion splicer.
- the fusion splicer includes a V-groove base 30 having a plurality of V-grooves 31 for arranging a plurality of optical fiber core wires 11.
- each of the 12-core optical fiber core wires 11A to 11L is arranged in the 12 V-grooves 31A to 31L.
- the pitch P0 of the V grooves 31A to 31L is 250 ⁇ m in accordance with the international standard for the outer diameter of the optical fiber core wire.
- the optical fiber core wires 11A to 11L in a state where the collective coating layer 20 is removed are arranged above the V-groove base 30.
- the optical fiber core wires 11A to 11L are arranged so that, for example, the center position of the V grooves 31A to 31L in the parallel direction coincides with the center position of the optical fiber core wires 11A to 11L in the parallel direction.
- the clamp lid (not shown) of the multi-core fusion splicer is closed, and the optical fiber core wires 11A to 11L are pushed down from above by the clamp lid.
- the optical fiber tape core has no connecting portion and the distance between the centers of the adjacent optical fiber cores of the optical fiber core is zero, the distance between the centers is smaller than the pitch P0 of the V-grooves 31A to 31L. ..
- the plurality of optical fiber core wires are arranged so as to gather toward the center position of the V-groove base 30, and are not arranged so as to face the V-grooves 31A to 31L. Therefore, each of the plurality of optical fiber core wires is not always accommodated in the V-grooves 31A to 31L, and for example, the optical fiber core wires may not be accommodated in the V-grooves 31A and 31L. This can occur even if the distance P between the centers of adjacent optical fiber cores is less than 220 ⁇ m.
- each optical fiber core wire 11A to 11L is arranged so as to face each V groove 31A to 31L. Therefore, when the optical fiber core wires 11A to 11L are pushed down substantially vertically, one optical fiber core wire 11A to 11L is accommodated in each of the V grooves 31A to 31L.
- FIG. 3 shows that the optical fiber core wires 11A to 11L in the state where the collective coating layer 20 is removed are housed in the V grooves 31A to 31L. And the secondary resin layer 14 may be removed, and only the glass fiber 12 may be accommodated in the V-grooves 31A to 31L.
- the dynamic friction force of the collective coating layer 20 is 0.3 N or less, the friction between the adjacent optical fiber tape core wires is reduced. Can be done. Even when a plurality of optical fiber tape core wires 1A are mounted on an optical fiber cable at high density, friction between adjacent optical fiber tape core wires 1A is reduced, so that cable meandering can be suppressed and cable laying can be performed. Work can be improved.
- the collective coating layer 20 covers the outer periphery of each of the plurality of optical fiber core wires. If the outer periphery of any optical fiber core wire 11 is not completely covered by the collective coating layer 20 and there is a portion exposed from the collective coating layer 20, the exposed portion is the starting point for the collective coating layer 20. May peel off from the optical fiber core wire 11, and as a result, the optical fiber core wire 11 may be separated from the optical fiber tape core wire by a single core. However, in this example, since the outer periphery of each of the plurality of optical fiber core wires is covered with the collective covering layer 20, the single cores are not separated.
- each optical fiber core wire 11 of the optical fiber tape core wire 1A of this example is 215 ⁇ m or less, the cross-sectional area of the optical fiber core wire 11 is small, and it can be mounted on an optical fiber cable at high density.
- the surface hardness of the batch coating layer 20 is 1.2 GPa or more and 3 GPa or less, it is possible to reduce the friction generated between the adjacent optical fiber core wires. Therefore, even when the optical fiber tape core wire is mounted on the cable at a high density, the cable meandering can be suppressed and the cable laying work can be improved. Furthermore, the transmission characteristics of the cable at low temperatures can be ensured.
- the distance between the centers of the adjacent optical fiber core wires is 220 ⁇ m or more and 280 ⁇ m or less, it can be used for a general multi-core fusion splicer or a connecting device. Even if each optical fiber core wire 11 is reduced in diameter, it is not necessary to prepare a multi-core fusion splicer dedicated to a small diameter such that V grooves are formed at a narrow pitch, so that the optical fiber tape core wire 1A
- the versatility of the above is high, and the manufacturing cost can be reduced.
- FIG. 4 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber tape core wire 1B according to the first modification.
- the same reference numbers are given to the elements substantially the same as or corresponding to the configuration exemplified in FIG. 1, and the repeated description will be omitted.
- the plurality of optical fiber core wires 11 of the optical fiber tape core wire 1B have a first optical fiber core wire having an outer diameter D1 (an example of the first outer diameter) and an outer diameter D2 (the first). It has a second optical fiber core wire having an example of two outer diameters).
- the first optical fiber core wire having the outer diameter D1 and the second optical fiber core wire having the outer diameter D2 are arranged alternately.
- the outer diameter D1 of the first optical fiber core wire and the outer diameter D2 of the second optical fiber core wire are both 215 ⁇ m or less.
- the outer diameter D1 is 200 ⁇ m and D2 is 180 ⁇ m.
- the first optical fiber core wires 11A', 11C', 11E', 11G', 11I', and 11K' provide a glass fiber 12, a primary resin layer 13, and a secondary resin layer 14, respectively.
- the connecting portion 21 of the collective coating layer 20 is arranged so that the distance P between the centers of the adjacent optical fiber core wires is 220 ⁇ m or more and 280 ⁇ m or less.
- the first optical fiber core wires 11A', 11C', 11E', 11G', 11I', 11K having a large outer diameter D1.
- the second optical fiber core wires 11B, 11D, 11F, 11H, 11J, 11L having a small outer diameter D2 are arranged in the gap of'. Therefore, as compared with the case where the optical fiber core wires 11 have the same outer diameter, it is better that the plurality of optical fiber core wires 11 have different outer diameters D1 and D2.
- the mounting density is high.
- the optical fiber tape core wire 1B according to the present modification 1 has a plurality of optical fiber core wires having a first optical fiber core wire having an outer diameter D1 and a second optical fiber core wire having an outer diameter D2. Since the 11 is provided, the optical fiber core wire 11 can be mounted at a higher density on the optical fiber cable.
- FIG. 5 is a diagram showing a part of the optical fiber tape core wire 1C according to the modified example 2 in the longitudinal direction.
- FIG. 6 is a cross-sectional view of the optical fiber tape core wire 1C. In the description of FIG. 6, the elements substantially the same as or corresponding to the configuration exemplified in FIG. 1 are designated by the same reference numbers, and the repeated description will be omitted.
- the batch covering layer 20C of the optical fiber tape core wire 1C is unconnected in at least a part of the plurality of optical fiber core wires 11 to which the adjacent optical fiber tape core wires are not connected. Including part 24.
- FIGS. 5 and 6 show the optical fiber tape core wire 1C having the non-connecting portion 24.
- the non-connecting portion 24 is between the optical fiber core wires 11A and 11B, between 11C and 11D, between 11D and 11E, between 11F and 11G, between 11G and 11H, and between 11I and 11J. , Is formed between 11J and 11K.
- the arrangement position of the non-connecting portion 24 shown in FIG. 6 is an example, and is not limited thereto.
- the non-connecting portion 24 is formed intermittently in the longitudinal direction of the optical fiber tape core wire 1C. Even if the non-connecting portion 24 is formed, the optical fiber core wires 11A to 11L are arranged so that the distance P between the centers of the adjacent optical fiber core wires is 220 ⁇ m or more and 280 ⁇ m or less.
- the optical fiber tape core wire 1C according to the second modification since the non-connecting portion 24 is intermittently formed in the longitudinal direction of the optical fiber tape core wire 1C, the cross section perpendicular to the longitudinal direction is formed. , The deformability of the optical fiber tape core wire 1C is increased. Since the optical fiber tape core wire 1C is easily deformed, a plurality of optical fiber tape core wires 1C can be mounted on the optical fiber cable at high density.
- the optical fiber core wire 11 of the optical fiber tape core wire 1C is as shown in the modification 1. May have different outer diameters D1 and D2.
- FIG. 7 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber tape core wire 1D according to the modified example 3.
- FIG. 8 is a cross-sectional view of one optical fiber core wire 11B among the plurality of optical fiber core wires 11 included in the optical fiber tape core wire 1D shown in FIG. 7.
- the same reference numbers are given to the elements substantially the same as or corresponding to the configurations exemplified in FIGS. 1 and 2, and the repeated description is omitted.
- the collective covering layer 20D includes a thick portion 22 and at least two thin portions 23.
- the thickness of the collective coating layer 20D is non-uniform on the outer periphery of the optical fiber core wire 11B.
- the thickness of the collective coating layer 20D on the outer periphery of the optical fiber core wire 11B is measured at a total of five locations excluding the connecting portion 21.
- the vicinity of the portion where the thickness of the collective coating layer 20D is the thickest is referred to as the thick portion 22, and the periphery of the portion where the thickness of the collective coating layer 20D is 5 ⁇ m or more thinner than the thick portion 22 is referred to as the thin portion 23.
- the positions of the thick portion 22 and the thin portion 23 on the outer periphery of the optical fiber core wire 11B shown in FIG. 8 are examples, and are not limited thereto. Further, since the collective coating layer 20D covers the entire outer periphery of the optical fiber core wire 11B, there is no place where the optical fiber core wire 11B is exposed from the collective coating layer 20D.
- the thickness d2 of the collective coating layer 20D in the thin-walled portion 23 is thinner than the thickness d1 of the collective coating layer 20D in the thick-walled portion 22. Specifically, the difference between the thickness d1 of the collective coating layer 20D in the thick portion 22 and the thickness d2 of the collective coating layer 20D in the thin-walled portion 23 is 5 ⁇ m or more and 19 ⁇ m or less.
- the thickness d1 of the collective coating layer 20D in the thick portion 22 is, for example, 20 ⁇ m or less.
- the thickness d2 of the collective coating layer 20D in the thin portion 23 is, for example, 1 ⁇ m or more and 15 ⁇ m or less.
- the thickness of the collective coating layer between the optical fiber core wire 11B and the optical fiber core wire 11A or 11C means the thickness from the midpoint of the connecting portion 21 to the optical fiber core wire 11B.
- the collective coating layer 20D includes the thick portion 22 and at least two thin-walled portions 23, and the thickness of the collective coating layer 20D is non-uniform. It has become.
- the difference between the thickness d1 of the collective coating layer 20D in the thick portion 22 and the thickness d2 of the collective coating layer 20D in the thin portion 23 is relatively large, 5 ⁇ m or more and 19 ⁇ m or less, the plurality of optical fiber tape core wires 1D are optical. Even when mounted on a fiber cable at high density, the contact area between the optical fiber cores and the contact area between the optical fiber tape cores between the adjacent optical fiber tape cores 1D can be reduced. Therefore, friction is less likely to occur between adjacent optical fiber tape core wires, cable meandering can be suppressed, and cable laying work can be improved.
- the thick portion 22 of each optical fiber core wire may be arranged at a position facing the thin portion 23 of the other optical fiber core wire. possible. Therefore, the mounting density of the optical fiber core wire 11 on the optical fiber cable is higher when the thick portion 22 and the thin wall portion 23 are provided as compared with the case where the collective coating layer 20D has a uniform thickness.
- FIG. 9 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber tape core wire 1X used in the evaluation experiment 1.
- the elements substantially the same as or corresponding to the configuration exemplified in FIG. 4 are designated by the same reference numbers, and the repeated description will be omitted.
- the optical fiber tape core wire 1X used in the present evaluation experiment 1 has four optical fiber core wires 11A', 11B, 11C', and 11D.
- Each optical fiber core wire includes a glass fiber 12, a primary resin layer 13, and a secondary resin layer 14.
- the outer diameter D1 of the optical fiber core wires 11A'and 11C' is 200 ⁇ m.
- the outer diameter D2 of the optical fiber core wires 11B and 11C is 180 ⁇ m.
- the optical fiber core wire having an outer diameter D1 of 200 ⁇ m and the optical fiber core wire having an outer diameter D2 of 180 ⁇ m are alternately arranged along the direction orthogonal to the longitudinal direction of the optical fiber tape core wire 1X. Will be done.
- the distance between the centers of the adjacent optical fiber cores 11 is 255 ⁇ m.
- the ultraviolet curable resin is applied to the outer periphery of the four optical fiber core wires 11A'to 11D arranged in parallel. After that, the ultraviolet curable resin is cured by irradiation with ultraviolet rays, and the collective coating layer 20 is formed. At this time, the outer periphery of each of the optical fiber core wires 11A'to 11D is covered with the collective covering layer 20. The dynamic friction force and surface hardness of the collective coating layer 20 change depending on the components of the ultraviolet curable resin applied. The ultraviolet curable resin is cured to form a connecting portion 21 between all adjacent optical fiber core wires. In the optical fiber tape core wire 1X, the thickness of the collective coating layer 20 is 5 to 20 ⁇ m.
- the sample No. of the optical fiber tape core wire 1X having various dynamic frictional forces or surface hardness was adjusted by adjusting the components of the ultraviolet curable resin to be applied. 1 to No. 5 was created. As a comparative example, sample No. 6-No. 7 was created. In this evaluation experiment 1, the dynamic friction force, surface hardness and low temperature characteristics of the optical fiber tape core wire 1X were evaluated.
- FIG. 10 is a schematic diagram of the dynamic friction force measurement experiment used in the evaluation experiment 1.
- the optical fiber tape core wire 1X1 to be measured is wound around the outer circumference of a mandrel 41 having an outer diameter of 10 mm.
- Yet another optical fiber tape core wire 1X2 to be measured is arranged so as to be in contact with the optical fiber tape core wire 1X1 wound around the mandrel 41 from above the mandrel 41 via the roller 42.
- a pulling machine 43 is arranged at one end (upper side in FIG. 10) of the optical fiber tape core wire 1X2, and a weight 44 is arranged at the other end (lower side in FIG. 10) of the optical fiber tape core wire 1X2.
- the optical fiber tape core wire 1X2 extending from the roller 42 to the mandrel 41 is bent 90 degrees with respect to the optical fiber tape core wire 1X2 extending from the pulling machine 43 to the roller 42.
- the optical fiber tape core wire 1X2 extending from the mandrel 41 to the weight 44 is bent 90 degrees with respect to the optical fiber tape core wire 1X2 extending from the roller 42 to the mandrel 41.
- the detector provided inside the tensioning machine 43 measured the tension of the optical fiber tape core wire 1X2, and used this as the dynamic friction force.
- the measurement temperature is 23 ° C.
- the dynamic friction coefficient ⁇ can be obtained by the method described in Japanese Patent Application Laid-Open No. 6-265737. In this evaluation experiment 1, the weight 44 weighs 10 g.
- the pulling machine 43 pulls the optical fiber tape core wire 1X2 at a speed of 500 mm / min in a certain direction (upward in FIG. 10), and the detector provided inside the pulling machine 43 is the optical fiber tape. Tension is measured as the dynamic friction force of the core wire 1X2.
- the composite elastic modulus in the depth direction was determined by a test method based on ISO14577 using a HYSITRON TI950 Triborndenter manufactured by BRUKER.
- the composite elastic modulus refers to the surface hardness.
- the indentation depth was 100 nm, and the measurement was performed using a Berkovich indenter.
- the low temperature characteristics of the optical fiber tape core wire 1X were evaluated.
- the low temperature characteristics measure the amount of attenuation per unit distance when light having a wavelength of 1.55 ⁇ m is incident on the optical fiber core wire 11A'in the cable under the environment of 23 ° C. and -30 ° C. It was evaluated by the difference in the measured values under the temperature environment.
- the evaluation results are shown in Table 1.
- sample No. 1 to No. It was confirmed that the low temperature characteristics of No. 5 were all 0.3 dB / km or less, and the cable loss was small. On the other hand, sample No. 6 and No. The low temperature characteristics of 7 both exceeded 0.3 dB / km. In particular, sample No. Surface hardness of No. 1 and sample No. Although the surface hardness of No. 6 is 1.2 MPa, the sample No. Sample No. 6 as compared with 6. The low temperature characteristic of 1 is excellent. From the above, it was confirmed that when the dynamic friction force is 0.3 N or less, the optical fiber tape core wire 1X with low cable loss characteristics can be realized. Furthermore, sample No. 1 to No. Since all of the low temperature characteristics of No. 5 are relatively excellent, it was confirmed that when the surface hardness is 1.2 GPa or more and 3 GPa or less, the optical fiber tape core wire 1X with less cable loss characteristics can be realized.
- FIG. 11 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber tape core wire 1Y used in the evaluation experiment 2.
- the elements substantially the same as or corresponding to the configuration exemplified in FIG. 9 are designated by the same reference numbers, and the repeated description will be omitted.
- the optical fiber tape core wire 1Y used in this evaluation experiment 2 includes a non-connecting portion 24.
- the ultraviolet curable resin is applied to the outer periphery of the four optical fiber core wires 11A'to 11D arranged in parallel. After that, the ultraviolet curable resin is cured by irradiation with ultraviolet rays, and the collective coating layer 20D is formed. At this time, the outer periphery of each of the optical fiber core wires 11A'to 11D is covered with the collective covering layer 20D.
- the thickness of the ultraviolet curable resin to be applied according to the shape of the die or the like, the thick portion 22 and the thin portion 23 are formed.
- the adjacent optical fiber core wires 11C are between the adjacent optical fiber core wires 11A'and 11B.
- a cutting blade such as a cutter is intermittently inserted between'and 11D in the longitudinal direction of the optical fiber tape core wire 1Y to form the non-connecting portion 24.
- the connecting portion 21 remains between the optical fiber core wires 11B and 11C'in which the cutting blade is not inserted.
- the sample No. of the optical fiber tape core wire 1Y having various thicknesses of the collective coating layer 20D was adjusted by adjusting the thickness of the ultraviolet curable resin to be applied. 1 to No. 3 was created.
- sample No. 4 was created.
- the optical fiber core wire 11A' was selected as an arbitrary optical fiber core wire of each sample, and the collective coating layer at eight arbitrary measurement positions I to VIII on the optical fiber core wire 11A' The thickness of 20D was measured.
- the optical fiber tape core wire 1Y was mounted on the optical fiber cable, and the cable loss characteristic was evaluated as the low temperature characteristic of the optical fiber tape core wire 1Y.
- the evaluation method of the cable loss characteristic is the same as the evaluation method of the evaluation experiment 1.
- the optical fiber tape core wire 1Y was taken out from the optical fiber cable, and the presence or absence of single core separation of the optical fiber core wire was examined. The results of these evaluations are shown in Table 2.
- sample No. 1 to No. In No. 3 the single core separation of the optical fiber tape core wire 1Y was not confirmed.
- Sample No. 4 has two points where the thickness of the collective coating layer 20D is zero at the measurement positions II and IV. These measurement positions II and IV are portions where the optical fiber core wire 11A'is not covered by the collective coating layer 20D and is exposed from the collective coating layer 20D.
- sample No. In 2 the measurement positions I, III, V to VIII correspond to the thick portion 22, and the thickness of the collective coating layer 20D at each measurement position is 20 ⁇ m.
- Sample No. In No. 4 the measurement positions II and IV correspond to the thin-walled portion 23, and the thickness of each collective coating layer 20D is 1 ⁇ m.
- sample No. In No. 3 the measurement positions I, III, V, VII, and VIII correspond to the thick portion 22, and the thickness of the collective coating layer 20D at each measurement position is 20 ⁇ m. Sample No. In No.
- the measurement positions II, IV, and VI correspond to the thin-walled portion 23, and the thickness of each collective coating layer 20D is 1 ⁇ m.
- Sample No. It was confirmed that the cable loss of No. 3 was 0.25 dB / km. From the above, when the difference between the thickness of the collective coating layer 20D in the thick portion 22 and the thickness of the collective coating layer 20D in the thin portion 23 is 19 ⁇ m or less, it is possible to realize the optical fiber tape core wire 1Y with a small cable loss. confirmed.
- sample No. 1 As shown in Table 2, sample No. It was confirmed that the cable loss of 1 was 0.3 dB / km.
- Sample No. In 1 the measurement positions I, III, V to VIII correspond to the thick portion 22, and the measurement positions II, IV correspond to the thin portion 23.
- Sample No. In No. 1 the thickness of the collective coating layer 20D in the thick portion 22 is 20 ⁇ m, and the thickness of the collective coating layer 20D in the thin portion 23 is 15 ⁇ m. From the above, when the difference between the thickness of the collective coating layer 20D in the thick portion 22 and the thickness of the collective coating layer 20D in the thin portion 23 is 5 ⁇ m or more, it is possible to realize the optical fiber tape core wire 1Y with a small cable loss. confirmed.
- Optical fiber tape core wire 11 11A to 11L: Optical fiber core wire 12: Glass fiber 13: Primary resin layer 14: Secondary resin layer 20, 20C, 20D: Collective Coating layer 21: Connecting part 22: Thick part 23: Thin part 24: Non-connecting part 30: V-groove base 31, 31A to 31L: V-groove 41: Mandrel 42: Roller 43: Pulling machine 44: Weights D, D1, D2: Outer diameter of optical fiber core wire P: Distance between centers of adjacent optical fiber core wires P0: V groove pitch d1: Thickness of collective coating layer in thick-walled portion d2: Thickness of collective coating layer in thin-walled portion
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
本出願は、2020年10月19日出願の日本出願第2020-175368号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
長手方向に直交する方向に並列に配置された複数の光ファイバ心線と、
前記複数の光ファイバ心線それぞれの外周を被覆する一括被覆層と、を備え、
前記一括被覆層は、前記複数の光ファイバ心線の少なくとも一部において、隣り合う光ファイバ心線を連結する連結部を含み、
前記複数の光ファイバ心線の外径はそれぞれ215μm以下であり、
前記一括被覆層の動摩擦力が0.3N以下である。
光ファイバテープ心線が光ファイバケーブルに高密度に実装された場合、光ファイバ心線同士が互いに接触しやすいため、光ファイバ心線間において摩擦が起こることがある。このような摩擦がケーブルの長手方向において不均一に発生することで、ケーブルが蛇行しやすくなることがあった。さらに、低温下におけるケーブルの伝送特性が低下する傾向があった。特に、複数の光ファイバ心線の外径が互いに異なる場合には、ケーブルはより蛇行しやすく、伝送特性がより低下しやすい。
まず本開示の実施態様を列記して説明する。
(1)本開示の一態様に係る光ファイバテープ心線は、
長手方向に直交する方向に並列に配置された複数の光ファイバ心線と、
前記複数の光ファイバ心線それぞれの外周を被覆する一括被覆層と、を備え、
前記一括被覆層は、前記複数の光ファイバ心線の少なくとも一部において、隣り合う光ファイバ心線を連結する連結部を含み、
前記複数の光ファイバ心線の外径はそれぞれ215μm以下であり、
前記一括被覆層の動摩擦力が0.3N以下である。
本開示の光ファイバテープ心線の各光ファイバ心線の外径は215μm以下であるため、ケーブルへ高密度に実装することができる。
本開示によれば、一括被覆層の表面硬度が1.2GPa以上3GPa以下であるため、隣り合う光ファイバテープ心線同士の間に生じる蛇行を低減することができる。したがって光ファイバテープ心線がケーブルに高密度に実装された場合でもケーブル蛇行を抑制することができる。さらに低温下におけるケーブルの伝送特性を担保することができる。
本開示によれば、隣り合う光ファイバ心線の中心間の距離が220μm以上280μm以下であるため、一般的な接続機器を利用することができる。各光ファイバ心線が細径化されていても、細径専用の接続機器を用意する必要がないため、汎用性のある光ファイバテープ心線を提供することができる。
前記連結部は、前記長手方向において間欠的に形成されていてもよい。本開示によれば、非連結部が長手方向に間欠的に設けられているため、長手方向に垂直な断面において、光ファイバテープ心線が変形しやすくなる。したがって光ファイバケーブルに光ファイバ心線を高密度に実装することができる。
前記厚肉部における前記一括被覆層の厚みと、前記薄肉部における前記一括被覆層の厚みとの差が、5μm以上19μm以下であってもよい。
本開示によれば、複数の光ファイバテープ心線は、第一の外径を有する第一光ファイバ心線と、第二の外径を有する第二光ファイバ心線と、を有するため、ケーブル蛇行を抑制しつつ、光ファイバケーブルに光ファイバ心線を高密度に実装することができる。
(本開示の効果)
本開示の第一実施形態に係る光ファイバテープ心線の具体例を、図面を参照しつつ説明する。
なお、本開示はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。
第一実施形態に係る光ファイバテープ心線1Aにおいて、光ファイバ心線11の外径は全て同一であったが、光ファイバ心線11の外径は同一でなくてもよい。図4は、変形例1に係る光ファイバテープ心線1Bの長手方向に対して垂直な断面図である。図4の説明において、図1に例示された構成と実質的に同一または対応する要素には同様の参照番号を付し、繰り返しとなる説明は省略する。
第一実施形態に係る光ファイバテープ心線1Aの連結部21は、隣り合う光ファイバ心線を全て連結していたが、連結部の配置はこれに限定されない。図5は、変形例2に係る光ファイバテープ心線1Cの長手方向の一部を示した図である。図6は光ファイバテープ心線1Cの断面図である。図6の説明において、図1に例示された構成と実質的に同一または対応する要素には同様の参照番号を付し、繰り返しとなる説明は省略する。
第一実施形態に係る光ファイバテープ心線1Aにおいて、一括被覆層20の厚みは各光ファイバ心線11の外周において均一であったが、一括被覆層20の厚みは均一でなくても良い。図7は、変形例3に係る光ファイバテープ心線1Dの長手方向に対して垂直な断面図である。図8は、図7に示す光ファイバテープ心線1Dが備える複数の光ファイバ心線11のうち、一つの光ファイバ心線11Bの断面図である。図7及び図8の説明において、図1及び図2に例示された構成と実質的に同一または対応する要素には同様の参照番号を付し、繰り返しとなる説明は省略する。
本開示における光ファイバテープ心線の動摩擦力および表面硬度の評価を行った。図9は、評価実験1に用いた光ファイバテープ心線1Xの長手方向に対して垂直な断面図である。図9の説明において、図4に例示された構成と実質的に同一または対応する要素には同様の参照番号を付し、繰り返しとなる説明は省略する。
本評価実験1において錘44の重さは10gである。この状態で、引張機43が光ファイバテープ心線1X2を500mm/minの速さで一定方向(図10においては上方向)に引っ張り、引張機43の内部に備えられた検出器が光ファイバテープ心線1X2の動摩擦力として張力を測定する。
本開示における光ファイバテープ心線の低温特性及び単心分離の有無の評価を行った。図11は、評価実験2に用いた光ファイバテープ心線1Yの長手方向に対して垂直な断面図である。図11の説明において、図9に例示された構成と実質的に同一または対応する要素には同様の参照番号を付し、繰り返しとなる説明は省略する。
11、11A~11L:光ファイバ心線
12:ガラスファイバ
13:プライマリ樹脂層
14:セカンダリ樹脂層
20、20C、20D:一括被覆層
21:連結部
22:厚肉部
23:薄肉部
24:非連結部
30:V溝ベース
31、31A~31L:V溝
41:マンドレル
42:ローラ
43:引張機
44:錘
D、D1、D2:光ファイバ心線の外径
P:隣り合う光ファイバ心線の中心間の距離
P0:V溝ピッチ
d1:厚肉部における一括被覆層の厚み
d2:薄肉部における一括被覆層の厚み
Claims (6)
- 長手方向に直交する方向に並列に配置された複数の光ファイバ心線と、
前記複数の光ファイバ心線それぞれの外周を被覆する一括被覆層と、を備え、
前記一括被覆層は、前記複数の光ファイバ心線の少なくとも一部において、隣り合う光ファイバ心線を連結する連結部を含み、
前記複数の光ファイバ心線の外径はそれぞれ215μm以下であり、
前記一括被覆層の動摩擦力が0.3N以下である、光ファイバテープ心線。 - 前記一括被覆層の表面硬度が1.2GPa以上3GPa以下である、請求項1に記載の光ファイバテープ心線。
- 隣り合う前記光ファイバ心線の中心間の距離が220μm以上280μm以下である、請求項1または請求項2に記載の光ファイバテープ心線。
- 前記一括被覆層は、前記複数の光ファイバ心線の少なくとも一部において、隣り合う前記光ファイバ心線が連結していない非連結部を含み、
前記連結部は、前記長手方向において間欠的に形成されている、請求項1から請求項3のいずれか一項に記載の光ファイバテープ心線。 - 前記光ファイバ心線の断面視において前記一括被覆層は、厚肉部と、前記一括被覆層の厚みが前記厚肉部における前記一括被覆層の厚みよりも薄い、少なくとも二つの薄肉部と、を備え、
前記厚肉部における前記一括被覆層の厚みと、前記薄肉部における前記一括被覆層の厚みとの差が、5μm以上19μm以下である、請求項1から請求項4のいずれか一項に記載の光ファイバテープ心線。 - 前記複数の光ファイバ心線は、第一の外径を有する第一光ファイバ心線と、第二の外径を有する第二光ファイバ心線と、を有する、請求項1から請求項5のいずれか一項に記載の光ファイバテープ心線。
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CN202180071195.7A CN116324559A (zh) | 2020-10-19 | 2021-10-15 | 光纤带状芯线 |
US18/249,296 US20240027715A1 (en) | 2020-10-19 | 2021-10-15 | Optical fiber ribbon |
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US20240027715A1 (en) | 2024-01-25 |
EP4231074A1 (en) | 2023-08-23 |
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