JP2004053989A - Optical fiber storage parts and optical fiber storage units - Google Patents

Abstract

An optical fiber storage part and an optical fiber storage unit capable of efficiently storing a single-branch portion by reducing the size of an FO cord.
An optical fiber storage component (fusion tray) 20 according to the present invention includes an optical fiber tape core 43 near an outlet 24 of a tray body 21 capable of storing an extra length of the optical fiber ribbon 41,43. It is characterized in that a single core branch (FO branch) 44 branched into a single core can be attached.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical fiber storage component and an optical fiber storage unit, and more particularly, to an optical fiber storage component and an optical fiber storage unit capable of storing an extra length of an optical fiber ribbon diverged from an optical fiber cable in an intra-office device. .
[0002]
[Prior art]
Generally, in an optical fiber communication network such as FTTH (Fiber To The Home), an optical base station is installed which branches an optical fiber cable containing a large number of optical fiber ribbons into a plurality of single-core optical fibers by optical connection. ing. In this optical base station, for example, an optical fiber ribbon split from an optical fiber cable is separated into a single core and connected to a connector using an optical connection box which is an in-station device.
[0003]
As shown in FIG. 7, a conventional optical connection box 100 includes a frame 101, a fusion splicing section 102, a FO (fan-out) cord storage section 103, and a connector connecting section 104.
The fusion splicing section 102 fixes the optical fiber cable 110 introduced into the optical base station with the coating removed, and exposes the optical fiber ribbon 111 in the optical fiber cable 110. The optical fiber cable 110 is, for example, an 800-core cable containing 100 eight-core optical fiber ribbons 111, and for example, 160 (20) of them are stored in the fusion tray 105.
On the other hand, the remaining 640 fibers (80 fibers) of the optical fiber cable 110 are the passing cords 117, and the surplus length is stored in the passing cord tray 106 in a state of the optical fiber tape. The passing core wire 117 that has passed through the passing core tray 106 becomes an optical fiber cable 118 in a covered state, and is wired to another optical connection box or base station.
[0004]
The optical fiber ribbon 111 is accommodated in the fusion tray 105 while being fused to the tape cord portion 114 of the FO cord 113. The FO cord 113 includes a tape cord section 114, an FO branch section 115, and a single-core cord section 116, and a connector (not shown) attached to the tip of the single-core cord section 116 is connected to each modular of the connector connection section 104. It is connected.
[0005]
The tape cord portion 114 has an optical fiber ribbon that is concentric with the optical fiber ribbon 111, and a strength member is arranged around the optical fiber ribbon in order to ensure strength. It is covered with PVC resin. Further, one end thereof is fusion-spliced together with the optical fiber ribbon 111 and stored in the fusion tray 105.
[0006]
At the other end of the tape cord portion 114, a cylindrical FO branch portion (single core branch portion) 115 is provided, and the strength member of the tape cord portion 114 and the PVC resin are fixed to each other. Further, inside the FO branching section 115, the optical fiber ribbon of the tape cord section 114 is separated into a single core and branched into a plurality of single core sections 116. The single-core cord portion 116 is a single-core cord in which a tube is coated on an optical fiber. The FO branch portions 115 are individually fixed and stored in the FO code storage portion 103.
[0007]
As described above, 20 optical fiber ribbons 111 are stored in the fusion tray 105. Since one set of FO cords 113 is connected to one optical fiber ribbon 111, the optical connection box 100 is provided with 20 FO cords 113.
In some cases, all the optical fiber ribbons of the optical fiber cable 111 are connected to the FO cord 113 without providing the passing core 117, and in this case, 100 FO cords 113 are required.
[0008]
[Problems to be solved by the invention]
Incidentally, the tape cord portion 114 includes a tensile strength member and a PVC resin in order to secure strength. Therefore, the diameter of the tape cord portion 114 becomes large, and the storage efficiency when the tape code portion 114 is stored in the FO code storage portion 103 is low.
Further, it is necessary to provide an FO branch portion 115 for fixing the tensile strength member of the tape cord portion 114 and the PVC resin to each other. The FO branch portion 115 has, for example, a length of 110 mm and an outer diameter of 12 mm according to the size of the tape cord portion 114. Therefore, when a large number of FO codes 113 are required as described above, it is necessary to provide a large space for accommodating the tape code section 114, and further to fix the FO branch section 115 and accommodate the FO code 113. It is necessary to provide a large space. Therefore, the FO code storage unit 103 must be provided large.
Further, since the tensile strength member and the PVC resin are used as the tape cord portion 114, the manufacturing cost of the FO cord 113 has been high.
[0009]
The present invention has been made in order to solve the above-described problems, and provides an optical fiber storage component and an optical fiber storage unit that can reduce the size of an FO cord and efficiently store a single-fiber branch portion. Aim.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an optical fiber storage component according to the present invention is a single-core optical fiber ribbon obtained by branching an optical fiber ribbon in the vicinity of an exit of a tray body capable of storing an extra length of the optical fiber ribbon. A branch portion can be attached.
[0011]
In the optical fiber housing component having such a configuration, it is necessary to reinforce the optical fiber tape core since the single fiber branch portion obtained by branching the optical fiber tape core into a single core can be attached near the exit of the tray body. Absent. That is, since there is no need to cover the periphery of the optical fiber ribbon with a tensile strength member, a PVC resin, or the like, it is possible to reduce the size of the single-branch portion for branching the optical fiber ribbon compared to the related art.
Therefore, it is possible to increase the storage efficiency of the single core branch.
Further, since it is not necessary to use a tensile strength member or a PVC resin, the production cost of the FO cord can be reduced.
[0012]
In addition, the single-fiber branch portion was coated with a resin for the optical fiber ribbon while leaving the exposed portions, and a plurality of optical fiber strands exposed from the optical fiber ribbon. The plurality of single-core optical fibers extend around the exposed portion of the optical fiber strand, and extend over the optical fiber tape near the exposed portion and the single-core optical fiber near the exposed portion. In addition, it is desirable that the heat-shrinkable tube be used to fix the package together via an adhesive.
[0013]
Accordingly, the outer diameter of the single-core branch portion can be set to the outer diameter in which the heat-shrinkable tube is coated on the optical fiber ribbon. Therefore, it is easier to reduce the size of the single-fiber branch portion than in the past, and the storage efficiency of the single-fiber branch portion can be effectively increased.
[0014]
Further, it is desirable that a single-core branch portion fixing means to which the single-core branch portion can be attached is provided detachably with respect to the tray main body.
[0015]
According to the optical fiber housing component having such a configuration, even when the optical fiber ribbons housed in the tray main body are not branched, the single-fiber branch-portion fixing means can be properly removed by appropriately removing the single-fiber branch-portion fixing means. The optical fiber ribbon can be housed and wired without bothering.
[0016]
In addition, it is desirable that the single-core branch portion fixing means can detachably attach a plurality of single-core branch portions.
[0017]
According to the optical fiber housing component having such a configuration, it becomes easy to appropriately attach and detach a plurality of single-fiber branch portions and appropriately handle a desired number of optical fiber ribbons. For example, it is possible to easily cope with a case where an optical fiber ribbon is added.
[0018]
Further, an optical fiber storage unit according to the present invention for achieving the above object has a storage shelf capable of storing a plurality of the above-mentioned optical fiber storage parts, and having a detachable optical fiber storage part. .
[0019]
According to the optical fiber storage unit having such a configuration, an optical fiber storage component can be easily added or removed as required.
[0020]
Further, the optical fiber storage part of the optical fiber storage unit is detachable by sliding movement with respect to the storage shelf, and the single-fiber branch portion fixing means is mounted in the storage shelf in a direction orthogonal to the slide movement. It is desirable to have a configuration protruding outside the storage shelf.
[0021]
According to the optical fiber storage unit having such a configuration, it is not necessary to provide the single-fiber branch portion fixing means with a structure for being stored in the storage shelf. Further, the optical fiber storage component can be easily slid with respect to the storage shelf.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an optical fiber storage component and an optical fiber storage unit according to the present invention will be described with reference to FIGS.
FIG. 1 is a front view showing an optical connection box having an optical fiber storage component and an optical fiber storage unit according to the present invention. FIG. 2 is a perspective view showing the tray shelf of FIG. FIG. 3 is a perspective view showing a state in which the FO cord is mounted on the fusion tray shown in FIG. 4A and 4B are views showing the FO branch fixing part of FIG. 3, wherein FIG. 4A is a top view and FIG. 4B is a cross-sectional view taken along line XX of FIG. FIG. 5 is a top view showing a state where the FO branch section is fixed to the FO branch fixing section in FIG. FIG. 6 is a cross-sectional view showing the FO branch shown in FIG.
[0023]
The optical fiber storage component (hereinafter referred to as a fusion splicing tray) of the present embodiment reduces the size of the FO branch portion obtained by branching the optical fiber ribbon into a single core, and further stores the extra length of the optical fiber ribbon. A FO branch fixing portion to which a plurality of FO branch portions can be attached is provided near the exit of the possible tray body.
Further, the optical fiber storage unit of the present embodiment is characterized by having a storage shelf (hereinafter, referred to as a tray shelf) capable of storing and taking out a plurality of fusion trays.
[0024]
As shown in FIG. 1, the optical connection box 10 includes an optical fiber storage unit 12 and a connector connection section 60 in a frame 11.
The optical fiber storage unit 12 has a frame 14 mounted on the rack 11 and a tray shelf 13 provided on the inner wall of the frame 14. The tray shelf 13 accommodates a fusion tray 20 that can accommodate the extra length of the optical fiber ribbon and the fusion portion.
The connector connection section 60 is used, for example, as an optical transmission device, and can connect a large number of connectors mounted on a single-core optical fiber.
[0025]
The tray shelf 13 forming a part of the optical fiber storage unit 12 will be described.
As shown in FIGS. 1 and 2, the tray shelf 13 has seven support beams 18 formed on both left and right ends, and slides the fusion tray 20 from the front (in the direction of arrow A) to form six tray shelves. Can be stored. Further, it is possible to store the passing core wire 41 a branched from the optical fiber cable 40 by using the passing core wire tray 19. The passing core 41a is wired as an optical fiber cable 40a to another optical connection box or base station.
The optical fiber cable 40 of the present embodiment is an 800-fiber cable in which 100 eight-fiber optical fiber ribbons 41 are housed. Of these, 160 fibers (20) are housed in the fusion tray 20. Can be
[0026]
The tray shelf 13 is fixed to an inner wall of a frame 14 that can be mounted on the rack 11 so as to be stored inside the rack 11. Mount portions 15 having notches for screwing are formed at both front ends of the frame 14, and the frame 14 can be fixed to the frame 11.
A cable fixing portion 16 for holding and fixing the optical fiber cable 40 introduced into the optical base station is provided inside one side wall of the frame 14, and a single core is provided inside the other side wall. A clamp 17 for guiding the branched optical fiber 48 is provided.
[0027]
The fusing tray 20 that forms a part of the optical fiber storage unit 12 will be described.
As shown in FIGS. 1 and 3, the fusion tray 20 stored in the tray shelf 13 includes a tray body 21 capable of storing optical fiber ribbons 41 and 43, and a FO of an FO code 49. The FO branch fixing section (single-fiber branch fixing means) 30 capable of fixing the bifurcation (single-fiber branch) 44 is provided.
In addition, the fusion tray 20 slides with respect to the tray shelf 13 and is removably stored therein, and the FO branch fixing unit 30 is stored in the tray shelf 13 so that the FO branch fixing unit 30 is positioned outside the tray shelf (see FIG. It is a configuration that protrudes to the middle right).
[0028]
The tray body 21 is a housing in which a frame 22 is provided on a thin plate, and is made of plastic or metal. The extra length storage portion 25 defined by the frame 22 is a space for storing the optical fiber ribbon 41 introduced from the inlet 23 and the optical fiber ribbon 43 of the FO cord 49 introduced from the outlet 24. . The extra length of the accommodated optical fiber ribbons 41 and 43 ensures workability when the optical fiber ribbons 41 and 43 are fusion-spliced to each other. When the optical fiber ribbons 41 and 43 are fusion spliced, the fusion portion 42 is fixed to the fusion fixing portion 26 formed in the extra length storage portion 25.
The optical fiber ribbon 43 has the same structure as the optical fiber ribbon 41.
[0029]
Further, a plurality of claws 27 are formed on the frame 22 in order to prevent the optical fiber ribbons 41 and 43 stored in the extra length storage portion 25 from jumping upward.
Further, a bending preventing member 28 is provided at a central portion of the extra length storing portion 25 in order to prevent a small diameter bending from being added to the stored optical fiber ribbons 41 and 43. As a result, even when the optical fiber ribbons 41 and 43 move when the fusion tray 20 is stored in the tray shelf 13, for example, the optical fiber ribbons 41 and 43 may be bent to a specified diameter or less. In addition, a high-quality optical transmission path is guaranteed by preventing an increase in transmission loss.
In this embodiment, the bending prevention member 28 guarantees a minimum bending diameter of 60 mm.
[0030]
As shown in FIGS. 3 to 5, the FO branch fixing part (single-fiber branch part fixing means) 30 is attached near the outlet 24 of the tray main body 21. The FO branch fixing portion 30 can be detachably fixed to the tray main body 21 by passing a screw or the like through a fixing hole 32 of a fixing portion 31 formed in a flat plate shape. Further, the fixing portion 31 may include a snap mechanism that engages with the outlet 24 or the like, so that the fixing portion 31 can be attached to and detached from the tray main body 21.
[0031]
Further, the FO branch fixing portion 30 is formed in a flat plate shape continuous from the fixing portion 31, and is formed so as to rise from the end located on the side of the accommodated optical fiber ribbon 43. It has an edge 33. A plurality of ribs 35 are provided in parallel between the two edge portions 33. The gap between the plurality of ribs 35 and the gap with the edge 33 are fixed grooves 36, and two FO branch portions 44 are stacked in one fixed groove 36, and can be fixed in a detachable state. . In the present embodiment, nine ribs 35 are provided, thereby forming ten fixing grooves 36. Therefore, the FO branch fixing section 30 of the present embodiment can fix up to 20 FO branch sections 44 in parallel.
[0032]
When a desired number of FO branch portions 44 are fixed in the fixing grooves 36, the holding members 37 are mounted in the concave portions 34 formed in the edge portions 33. Thereby, it is possible to prevent the fixed FO branch portion 44 from coming off the FO branch fixing portion 30.
[0033]
As shown in FIG. 3, the FO cord 49 of the present embodiment comprises an optical fiber ribbon 43, a single optical fiber ribbon 48 obtained by branching the optical fiber ribbon 43, and an optical fiber ribbon. The FO branch 44 fixes the wire 43 and the optical fiber core 48 to each other. A connector 50 is attached to the optical fiber core 48 in order to connect to the modular of the connector connection part 60 described above.
[0034]
The FO branch section (single-fiber branch section) 44 that constitutes a part of the FO code 49 will be described.
As shown in FIGS. 3 and 6, the FO branch portion 44 is a member for mutually fixing the optical fiber ribbon 43 and a single-core optical fiber 48 branched from the optical fiber ribbon 43.
The optical fiber ribbon 43 of the FO branch portion 44 is branched from a desired position to a tip by removing a tape jacket connecting a plurality of optical fiber wires 47. Each of the branched optical fiber wires 47 is covered with a resin tube (outer diameter 0.9 mm) with a portion exposed at a predetermined interval from the tape jacket, and is coated with a single-core optical fiber core. The line 48 is used.
[0035]
The optical fiber ribbon 43, the plurality of optical fibers 47, and the plurality of optical fibers 48 are collectively fixed by a heat-shrinkable tube 45 having a hot melt adhesive 46 inside. The heat-shrinkable tube 45 is coated so as to extend around the exposed portion of the optical fiber strand 47, the optical fiber ribbon 43 near the exposed portion, and the optical fiber core 48 near the exposed portion. You. When the heat-shrinkable tube 45 is heated from the outside, the hot-melt adhesive 46 is softened and the heat-shrinkable tube 45 contracts, and the optical fiber ribbon 43, the plurality of optical fibers 47, and the plurality of optical fibers 48. Are fixed collectively to form the FO branch portion 44.
[0036]
When the optical fiber ribbon 43 has eight cores as in the FO cord 49 of the present embodiment, the heat-shrinkable tube 45 can have a heat-shrinkable size of 4 mm in outer diameter and 20 mm in length. .
The FO cord according to the present invention has a form in which the FO branch portion is directly provided on the optical fiber tape without using a tape cord portion coated with a tensile strength member or PVC resin around the optical fiber tape as in the related art. And For this reason, the FO branch according to the present invention can be significantly reduced in size as compared with the conventional FO branch.
[0037]
【The invention's effect】
As described above, according to the optical fiber housing component of the present invention, since there is no need to coat a tensile strength member or a PVC resin around the optical fiber ribbon, the single-fiber branch portion for branching the optical fiber ribbon is used. Can be made smaller than before.
Therefore, it is possible to increase the storage efficiency of the single core branch.
Further, since it is not necessary to use a tensile strength member or a PVC resin, the production cost of the FO cord can be reduced.
Further, according to the optical fiber storage unit of the present invention, an optical fiber storage component can be easily added or removed as required.
[Brief description of the drawings]
FIG. 1 is a front view showing an optical connection box having an optical fiber storage unit according to the present invention.
FIG. 2 is a perspective view showing a fusion splicing part of FIG. 1;
FIG. 3 is a perspective view showing a state where an FO cord is mounted on the fusion tray of FIG. 1;
4A and 4B are diagrams showing the FO branch fixing portion of FIG. 3, wherein FIG. 4A is a top view and FIG. 4B is a cross-sectional view taken along line XX of FIG.
5 is a top view showing a state where the FO branch section is fixed to the FO branch fixing section in FIG. 4;
FIG. 6 is a sectional view showing the FO branch shown in FIG. 5;
FIG. 7 is a front view showing an optical connection box having a conventional optical fiber storage unit.
[Explanation of symbols]
Reference Signs List 10 Optical connection box 11 Frame 12 Optical fiber storage unit 13 Tray shelf (storage shelf)
14 frame 20 fusion tray (optical fiber storage parts)
21 tray main body 24 outlet 25 extra length storage section 26 fusion fixing section 27 claw 28 bending prevention member 30 FO branch fixing section (single core branch fixing means)
35 Rib 36 Fixing groove 37 Pressing member 40 Optical fiber cable 41 Optical fiber ribbon 42 Fusion part 43 Optical fiber ribbon 44 FO branch (single branch)
45 Heat shrink tube 46 Hot melt adhesive 47 Optical fiber 48 Optical fiber core (single fiber core)
49 FO cord 50 Connector 60 Connector connection part

Claims (6)

An optical fiber storage component, wherein a single-fiber branch portion obtained by branching the optical fiber ribbon into a single fiber can be attached to the vicinity of the exit of the tray body capable of storing the extra length of the optical fiber ribbon. . The single core branch portion, the optical fiber ribbon,
A plurality of optical fiber strands exposed from the optical fiber ribbon,
A plurality of single-core optical fibers each coated with a resin for the optical fiber while leaving the exposed portion,
An adhesive is interposed between the exposed portion of the optical fiber and the single-core optical fiber near the exposed portion and the single-core optical fiber near the exposed portion. The optical fiber storage component according to claim 1, wherein the optical fiber storage component is configured to be collectively fixed by a heat-shrinkable tube. The optical fiber storage part according to claim 1, wherein the single-core branch portion fixing means to which the single-core branch portion can be attached is provided detachably with respect to the tray main body. 4. The optical fiber storage component according to claim 3, wherein the single-fiber branch fixing means is capable of detachably mounting a plurality of the single-fiber branch. 5. An optical fiber storage unit capable of storing a plurality of the optical fiber storage parts according to any one of claims 1 to 4, and having a storage shelf on which the optical fiber storage parts are detachable. The optical fiber storage component is detachable by sliding movement with respect to the storage shelf,
6. The light according to claim 5, wherein the single core branching portion fixing means projects outside the storage shelf in a direction orthogonal to the sliding movement in a state of being stored in the storage shelf. 7. Fiber storage unit.

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