JP2010019986A - Closure for optical cable connection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closure for optical cable connection which improves the working efficiency in handling operation of coated optical fibers, in a closure for optical cable connection. <P>SOLUTION: The closure includes: a closure housing 1 for storing a connected part between the coated optical fibers and an excess length; at least either one of a branched coated optical fiber module 2, with a built-in branching part for branching a multiple coated optical fiber ribbon into single fibers inside the closure housing, or a splitter module 3 with a built-in splitter for branching/coupling optical signals; a connector for connecting coated optical fibers, in at least either one of the branched coated optical fiber module 2 or the splitter module 3; a coated optical fiber optical connector at the end of the coated optical fibers; and a connector for connecting coated optical fibers at the branch coated optical fiber module 2 or the splitter module 3, wherein the coated optical fiber optical connector and the connector for connecting coated optical fibers are connected together. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical cable connection closure.

  When branching, drawing in, or connecting an optical cable, an optical cable connection closure is used (for example, see Patent Document 1 below). The optical fiber connecting portion and the extra length of the optical fiber are installed in the closure housing to accommodate and protect the connecting portion of the optical fiber and the extra length of the optical fiber.

FIG. 7 is a schematic diagram of a conventional optical cable connection closure.
As shown in FIG. 7, a conventional optical cable connection closure includes a termination board 101, a splitter module case 102, an optical connector termination case 103, a connection tray 104, and a center tray 105 in a closure housing 100. Yes. The optical fiber cores 107a and 107b drawn into the closure housing 100 from the main cable 106a are housed in the branch core wire 109 led out by the branch cable 108, the drop core wire 111 led out by the drop optical fiber 110, and the module. A storage case (not shown) is arranged for each extra length of the module cord optical connector 113 and the module cord 112 which are connecting portions with the cord 112.

  The outer jacket of the main cable 106 a is gripped by the introduction / extraction portions 100 a and 100 b of the closure housing 100. When the main cable 106a is a multi-core optical fiber cable, the main cable 106a is mainly composed of optical fiber cores 107a and 107b having tape cores. The optical fiber 107a is stripped of the coating of the tape core and branched into the single core 114, and the inside of the closure housing 100 is circulated in the state of the single core 114.

  When the optical fiber core wire 107b of the main cable 106a is not connected to the branch cable 106 or the drop optical fiber 109, the main cable 106b is led out from the closure housing 100 as it is. The optical fiber cores 107a and 107b are branched and stored in the center tray 105 for each of the optical fiber cores 107a and 107b.

  When connecting the main cable 106a, which is a multi-core optical fiber cable, and the branch cable 108, the bending radius of the optical fiber core wire 107a and the branch core wire 109 connected at the connection portion 115 in the connection tray 104 is 30 mm or more. The optical fiber core wire 107a and the branch core are in a state in which the loops are bundled so that the optical fiber core wire 107a and the branch core wire 109 are prevented from jumping out by a core wire pressing piece (not shown) in the connection tray 104. The extra length of the line 109 is stored.

  Here, when connecting the main cable 106a which is a multi-core optical fiber cable and the drop optical fiber 110, the optical fiber core wire 107a of the main cable 106a is connected to the drop optical fiber 110 via the splitter module 116 and pulled down. An example will be described with reference to FIGS.

FIG. 8 is a schematic diagram of a splitter module case and an optical connector termination case in a conventional optical cable connection closure.
As shown in FIG. 8, the splitter module 116 has a quartz-based planar waveguide circuit (hereinafter referred to as PLC) that is a splitter for branching and coupling optical signals, and splits the input optical signal into eight or four branches. Can do. The splitter module 116 is used in a state where it is housed in the splitter module case 117 in the closure casing 100. The splitter module 116 is connected to the splitter module input code 117 on the optical signal input side and the module code 112 on the optical signal output side.

  A single core pigtail fiber is fixed to the input side of the splitter module 116 as a splitter module input portion cord 117 with an adhesive, and an 8-core or 4-core tape core is provided as a module cord 112 on the output side of the splitter module 116. A wire pigtail fiber is secured with an adhesive. These module cords 112 have a length of 700 mm or more, and a module cord optical connector 113 is attached to the end of the module cord 112.

  As shown in FIG. 7, a single-core optical connector 118 for connecting the single-core wire 114 to the termination board 101 is attached to the single-core wire 114 obtained by branching the optical fiber core wire 107a into a single core, The optical connector 118 is connected to the termination board 101. An input part cord optical connector 119 for connecting to the termination board 101 is attached to the end of the splitter module input part cord 117, and the input part cord optical connector 119 is connected to the termination board 101.

  As shown in FIG. 8, the splitter module 116 is installed in a lower layer tray 102 a that is a lower layer tray of the splitter module case 102. After the module cord 112 is stored in the upper tray 102b, which is the upper tray of the splitter module case 102, the extra length of the module cord 112 is stored, and then the optical connector 113 of the module cord 112 and the drop optical fiber 110 are pulled down in the optical connector termination case 103. The core wire 111 is connected.

  The conventional optical fiber has a structure in which light is confined only by the refractive index difference between the core and the clad material. If the bending radius of the optical fiber is reduced, the radiation loss due to bending increases. It was necessary to manage the optical fiber so that the bending radius of the optical fiber was 30 mm or more with a limit value of about 30 mm.

  For this reason, for example, in the splitter module case 102, the optical connector termination case 103, the connection tray 104, the center tray 105, and the like in the closure housing 100, it is necessary to provide a space for securing a bending radius of 30 mm or more. Further, the splitter module case 102, the optical connector termination case 103, the connection tray 104, the center tray 105, etc. in the closure case 100 are connected to the splitter module case 102 in the closure case 100, the optical connector termination case. 103, a layout in which a radius of curvature of 30 mm in the vertical direction can be secured between the connection tray 104 and the center tray 105 is also required.

  By the way, there is a holey optical fiber as an optical fiber capable of reducing the bending radius as compared with the limit value of the bending radius of the conventional optical fiber (for example, see Patent Document 2 below). This holey optical fiber reduces the effective refractive index of the cladding by making air holes in the cladding around the core, and increases the refractive index difference between the core and the cladding, thereby reducing radiation loss due to bending. An optical fiber that suppresses the increase. Thus, since the holey optical fiber has a high resistance to bending and twisting, the optical fiber can be bent with a diameter that cannot be achieved by a conventional optical fiber.

JP 2000-121840 A JP 2005-17650 A

  As described above, the conventional optical cable connection closure is designed to secure a bending radius of the optical fiber of 30 mm or more. Therefore, as shown in FIGS. 7 and 8, in order to ensure a bend radius of 30 mm or more of the optical fiber without increasing the size of the closure housing 100 as much as possible, the splitter module case 102, the optical connector termination case 103, the connection The tray 104, the center tray 105, and the like are installed in multiple stages, and the optical fiber is routed through the splitter module case 102, the optical connector termination case 103, the connection tray 104, the center tray 105, and the like.

  For example, the conventional splitter module 116 as shown in FIGS. 7 and 8 has a module cord 112 with an optical connector 113 of 700 mm or more, and the extra length of the module cord 112 is wired in the closure casing 100 in the vertical direction. It was necessary to work. As described above, storing optical fibers through the cases installed in multiple stages in the closure housing 100 is a problem in improving work efficiency.

  However, if a holey optical fiber is used, the bending radius can be reduced. Therefore, the storage space for the extra length of the optical fiber can be reduced by using the holey optical fiber. As an effect, it is possible to have a layout that is arranged horizontally instead of wiring via cases arranged in multiple stages. However, it is difficult to handle and store the optical fiber in the downsized storage space, and there is a problem that the work efficiency is lowered.

  In addition, when a configuration in which the length of the optical fiber core to be stored is the same as that of the current situation is adopted, the length of the optical fiber core wire that can be wound around one round of the wheel is shortened along with the downsizing of the optical fiber. There is also a problem that the working time for storing the fiber increases.

  In view of the above, an object of the present invention is to provide an optical cable connection closure capable of improving the work efficiency of the operation of handling the optical fiber core in the optical cable connection closure.

An optical cable connection closure according to a first invention for solving the above-mentioned problems is as follows.
A closure housing for storing the connection portion between the optical fiber core wires and the extra length;
At least one of a branch core module having a branch portion for branching a multi-core optical fiber ribbon into a single core inside the closure housing and a splitter module having a splitter for branching and coupling optical signals. Either
A connector for connecting an optical fiber core to at least one of the branch core module or the splitter module;
An optical fiber core optical connector at an end of the optical fiber core;
An optical fiber core connector for the branch core module or the splitter module;
The optical fiber core optical connector is connected to the optical fiber core connector.

An optical cable connection closure according to a second invention for solving the above-mentioned problems is the optical cable connection closure according to the first invention,
A connector for inter-module connection is provided on the branch core module or the splitter module,
The branch core module and the splitter module are connected through the inter-module connector.

An optical cable connection closure according to a third invention for solving the above-mentioned problems is the optical cable connection closure according to the first invention or the second invention.
The optical fiber incorporated in at least one of the optical fiber branch core module and the splitter module is an optical fiber having a hole in the cross section of the optical fiber.

An optical cable connection closure according to a fourth invention for solving the above-mentioned problems is the optical cable connection closure according to any one of the first to third inventions,
At least one of the optical fiber branch core module and the splitter module is housed and fixed in a housing case, and the closure housing includes a plurality of the housing cases.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to implement | achieve the optical cable connection closure which can improve the working efficiency of the handling operation of the optical fiber core wire in the optical cable connection closure.

  Embodiments of an optical cable connection closure according to the present invention will be described below with reference to the drawings. Here, FIG. 1 is a schematic diagram of an optical cable connection closure according to the first embodiment of the present invention, and FIG. 2 is a schematic diagram of various configuration examples of the branch core module according to the second embodiment of the present invention. FIG. 3 is a schematic diagram of various configuration examples of the 8-branch splitter module according to the second embodiment of the present invention, and FIG. 4 is a schematic diagram of various configuration examples of the 4-branch splitter module according to the second embodiment of the present invention. FIG. 5 is a schematic diagram of an optical cable connection closure according to a third embodiment of the present invention, and FIG. 6 is a schematic diagram of an optical cable connection closure according to a third embodiment of the present invention.

A first embodiment of an optical cable connection closure according to the present invention will be described.
As shown in FIG. 1, the optical cable connection closure according to the present embodiment has a structure in which a branch core wire module 2 and a splitter module 3 described later are directly fixed to the closure housing 1. In the present embodiment, both the branch core module 2 and the splitter module 3 are provided, but a configuration including either the branch core module 2 or the splitter module 3 is also possible.

  The branch core module 2 is for a single core for connecting a multi-core optical connector 5 for connecting a multi-core tape optical fiber 8 and a single-core optical fiber 9 to the side surface of the branch core module 2. And an optical connector 6.

  The splitter module 3 includes, on the side surface of the splitter module 3, a single-core optical connector 4 that connects the single-core optical connector 6 of the branch core module 2 and the single-core optical fiber 11 of the splitter module 3, and a single-core optical connector 4. And a single-fiber optical connector 7 for connecting the optical fiber 12.

Next, a configuration example of the branch core module 2 in the optical cable connection closure according to the present embodiment will be described.
As shown in FIG. 1, the multi-core tape optical fiber 8 is branched into a single-core optical fiber 9 in the case 2 a of the branch core module 2. This branching splits the multi-core tape optical fiber 8 into a single-core optical fiber 9. A branch portion obtained by splitting and splitting the multi-fiber tape optical fiber 8 is covered with a branch portion protection member 10.

  A multi-fiber optical connector 5 is attached to the end of the multi-fiber tape optical fiber 8. A multi-fiber optical connector 5 is attached to each end of the single-core optical fiber 9. The multi-core optical connector 5 and the multi-core optical connector 5 in the branch core module 2 are fixed to the case 2a of the branch core module 2, and the multi-core tape optical fiber 8 and the single-core optical fiber 9 are branched cores. The module 2 is housed in the case 2a.

Next, a configuration example of the splitter module 3 in the optical cable connection closure according to the present embodiment will be described.
As shown in FIG. 1, the splitter module 3 includes a single-fiber optical connector 4. The optical signal guided by the single optical fiber 11 in the case 3 a of the splitter module 3 is branched to another single optical fiber 12. This branching is performed by a quartz-based planar waveguide circuit (hereinafter referred to as PLC) 13 which is a splitter for branching and coupling optical signals. The PLC 13, the single optical fiber 11 and the single optical fiber 12 are fixed to the case 3a of the splitter module 3 with an adhesive.

  In the case of the splitter module 3 having 8 branches, a single-core optical fiber 11 is fixed to one side by an adhesive, and an 8-core optical fiber 12 is branched to each single core on the opposite side. The optical fiber 12a is fixed with an adhesive. A single-core optical connector 7 is attached to the end of the single-core optical fiber 11. The single-core optical connector 4 and the single-core optical connector 7 in the splitter module 3 are fixed to the case 3 a of the splitter module 3, and the single-core optical fiber 11 and the single-core optical fiber 12 a are in the case 3 a of the splitter module 3. Store.

Next, an example in which the optical fiber core wire 21 which is one core of the main cable 20 is connected to the single core drop optical fiber 22 will be described.
As shown in FIG. 1, the main cable 20 introduced into and exited from the closure housing 1 is routed through the closure housing 1 in a state of an optical fiber core wire 21 by peeling off the jacket. The optical fiber core 21 is a multi-core tape optical fiber or a single-core tape optical fiber. In this embodiment, the optical fiber core 21 is a multi-fiber tape optical fiber.

  The optical fiber core 21 introduced into the closure housing 1 is cut at a certain length, and the multi-fiber optical connector 23 is attached to the end of the cut optical fiber core 21. The multi-fiber optical connector 23 is connected to the multi-fiber optical connector 5 of the branch core module 2. In the case 2a of the branch core module 2, the multi-fiber tape optical fiber 8 is branched at a branch portion (not shown) for each single-core optical fiber 9.

  The branch portion is covered with a branch portion protection member 10 that protects the branch portion. A single-fiber optical connector 6 is attached to the end of the optical fiber 9 branched in the case 2 a of the branch core module 2. The single-fiber optical connector 6 is fixed to the case 2 a of the branch fiber module 2.

  One fixing position of the single-fiber optical connector 6 in the case 2a of the branch core module 2 is fixed opposite to the mounting position of the single-fiber optical connector 4 of the splitter module 3, and the other three are the other It is fixed to the surface. The single-core optical connector 6 of the branch core module 2 fixed to the opposite side of the attachment position of the multi-core optical connector 5 of the branch core module 2 is the single-core optical connector 4 fixed to the case 3 a of the splitter module 3. Connect with.

  In the splitter module 3 connected to the branch core module 2 via the single-fiber optical connectors 4 and 6, the optical signal is branched into eight by the PLC 13 built in the splitter module 3. A single-core optical fiber 11 is fixed to the end of the PLC 13 on the side connected to the branch core module 2 with an adhesive, and an 8-fiber tape optical fiber 12 is bonded to the end of the PLC 13 on the opposite side. It is fixed by the agent.

  In the case 3a of the splitter module 3, the eight optical fibers 12 are branched for each single fiber to form a single optical fiber 12a. A single optical connector 7 is attached to the end of the single optical fiber 12a. The single optical connector 7 is fixed to the case 3 a of the splitter module 3. FIG. 1 shows an example in which eight single-fiber optical connectors 7 are arranged on one side surface of the case 3 a of the splitter module 3.

A single optical fiber connector 25 is attached to a single optical fiber 24 of the drop optical fiber 22 introduced into the closure housing 1 by tearing the outer cover of the drop optical fiber 22, and eight pieces are attached to the case 3 a of the splitter module 3. It is connected to one of the single-fiber optical connectors 7 fixed side by side.
The optical fiber core wire 21 which is one core of the main cables 20 is connected to the single core drop optical fiber 22 by the above configuration.

Next, an example in which the optical fiber core 21 which is one core of the main cable 20 is connected to the branch core module 2 and then connected to the drop optical fiber 26 without going through the splitter module 3 will be described.
As shown in FIG. 1, an optical fiber core 21 introduced into the closure housing 1 is cut at a predetermined length, and a multi-fiber optical connector 23 is attached to the end of the cut optical fiber core 21. Installing.

  The multi-fiber optical connector 23 attached to the optical fiber core 21 of the main cable 20 is connected to the multi-fiber optical connector 5 attached to the case 2a of the branch core module 2. A single-core optical connector 28 is attached to a single core fiber 27 of the drop optical fiber 26 and connected to the single-fiber optical connector 6 fixed to the case 2 a of the branch core module 2.

The single-core optical connector 6 of the branch core module 2 connected to the single-core optical connector 4 fixed to the splitter module 3 and the single-fiber optical connector directly connected to the drop optical fiber 26 without going through the splitter module 3 6 is different in the fixing position of the branch core module 2 in the case 2a.
With the configuration as described above, the optical fiber core wire 21, which is one core of the main cable 20, is connected to the single core core 27 without going through the splitter module 3.

Next, an example in which the multi-core tape optical fiber 29 of the main cable is connected to the multi-fiber tape optical fiber 31 of the branch cable 30 will be described.
As shown in FIG. 1, the multi-fiber tape optical fiber 29 of the main cable 20 and the multi-fiber tape optical fiber 31 of the branch cable 30 are each cut at a certain length. A multi-fiber optical connector 32 is attached to the end of the multi-fiber tape optical fiber 29 of the main cable 20, and a multi-fiber optical connector 33 is attached to the end of the multi-fiber tape optical fiber 31 of the branch cable 30. Then, the multi-fiber optical fiber connector 29 and the multi-fiber optical fiber connector 29 are connected to the connection tray 34 on the bottom of the closure housing 1. 33 is stored in a connected state.

  In this connection form, the end of the multi-fiber tape optical fiber 29 of the main cable 20 and the end of the multi-fiber tape optical fiber 31 of the branch cable 30 may be fusion-connected. In the case of fusion splicing, there is an excess in the multi-fiber tape optical fiber 29 of the main cable 20 and the multi-fiber tape optical fiber 31 of the branch cable 30 so that the fusion connection can be performed a plurality of times in preparation for the failure of the fusion connection. It is stored in the connection tray 34 with a length.

A second embodiment of the optical cable connection closure according to the present invention will be described.
In the optical cable connection closure according to the present embodiment, an optical fiber having holes in the cross section of the optical fiber is used as the optical fiber built in the branch core module 2 and the splitter module 3.

Next, various configuration examples of the branch core module 2 in the optical cable connection closure according to the present embodiment will be described.
As shown in FIG. 2, in the branch core module 2 according to this embodiment, the multi-core tape optical fiber 8, the branch protection member 10, the single-core optical fiber 9, and the single-core optical fiber 9 are used. The layout which comprises the optical connector 6 for single cores with which it mounted | wore is shown.

2A is a schematic view showing an example of the structure of a branch type cord module 2 of a serial type, FIG. 2B is a multi-faceted optical connector type, and FIG.
FIG. 2D is a schematic diagram showing a structural example in which the multi-fiber optical connector 5 can be removed. For example, when the extra length of the optical fiber core 21 from the main cable 20 is insufficient, the multi-fiber optical connector 5 can be detached from the branch core module 2 and connected.
Thus, according to the optical cable connection closure according to the present embodiment, the branch core module 2 can take various forms.

Next, various configuration examples of the splitter module 3 in the optical cable connection closure according to the present embodiment will be described.
As shown in FIGS. 3 and 4, in the splitter module 3 according to the present embodiment, the PLC 13, the eight-core tape optical fiber 12 fixed to the PLC 13 with an adhesive, and the tape optical fiber 12 are branched for each single core. A layout including a single-core optical fiber 12a and a single-core optical connector 7 attached to an end of the single-core optical fiber 12a is shown.

  3 (a) is an 8-branch series type, FIG. 3 (b) is a 4-core × 2-stage 8-branch series type, FIG. 3 (d) is an 8-branch PLC horizontal installation type, and FIG. FIG. 3 (f) shows an 8-branch PLC horizontal installation type in which the splitter module optical connector 4 and the branch optical fiber module single-core optical connector 7 are arranged on the same side surface, FIG. 3 (h). FIG. 4 is a schematic view showing an example of the structure of an 8-branch tape type splitter module of 4 cores × 2 tape core wires 14.

  FIGS. 3C and 3G are schematic views showing an example of a structure in which the multi-fiber optical connector 5 can be removed. For example, when a plurality of splitter modules 3 are stacked in the vertical direction and connected to the same branch core module 2, or a single core core of the drop optical fiber 22 on the lower side connected to the splitter module 3 When the extra length of 24 is insufficient, the single-fiber optical connectors 4 and 7 can be taken out from the splitter module 3 and connected.

  4 (a) is a 4-branch serial type, FIG. 4 (c) is a 4-branch PLC horizontal installation type, and FIG. 4 (d) is the same side surface of the splitter module optical connector 4 and the branched optical fiber module single-fiber optical connector 7. FIG. 4F is a schematic diagram showing an example of the structure of a 4-branch tape type splitter module of 4 cores × one tape core wire 14.

FIGS. 4B and 4E are schematic views showing an example of a structure in which the multi-fiber optical connector 5 can be removed. For example, when a plurality of splitter modules 3 are stacked in the vertical direction and connected to the same branch core module 2, or a single core core of the drop optical fiber 22 on the lower side connected to the splitter module 3 When the extra length of 24 is insufficient, the single-fiber optical connectors 4 and 7 can be taken out from the splitter module 3 and connected.
Thus, according to the optical cable connection closure according to the present embodiment, the splitter module 3 can take various forms.

  The optical fibers shown in FIGS. 2 to 4 are all optical fibers having holes in the cross section. For example, the holey in the cladding around the core lowers the effective refractive index of the cladding, increases the refractive index difference between the core and the cladding, and suppresses increase in radiation loss due to bending. It is an optical fiber.

  By using a holey optical fiber in the branch core module 2 and the splitter module 3, the bend radius of the optical fiber can be reduced to about 5 mm. Therefore, the case 2a of the branch core module 2 and the case of the splitter module 3 3a can be reduced in size. And since the case 2a of the branch core module 2 and the case 3a of the splitter module 3 are downsized, the branch core module 2 and the splitter module 3 can be installed in parallel.

  Moreover, as shown in FIGS. 2-4, the freedom degree of the layout design of each optical fiber 8, 9, 11, 12, PLC13, and the branch part protection member 10 accommodated in the branch core module 2 and the splitter module 3 improves. To do. In addition, the positions of the optical connectors 4, 5, 6, and 7 to be fixed to the case 2a of the branch core module 2 and the case 3a of the splitter module 3 can be varied as shown in FIGS. For example, as shown in FIG. 3B, when eight optical connectors 7 are fixed to the side surface of the case 3 a of the splitter module 3, four optical connectors 7 can be vertically arranged on one side surface.

  The optical fibers 8, 9, 11, and 12 in the branch core module 2 and the splitter module 3 preferably have a surplus length in preparation for failure of mounting the optical connectors 4, 5, 6, and 7. . In the case 2a of the branch core module 2 and the splitter module 3 in the case 3a of the extra length of each of the optical fibers 8, 9, 11, and 12, the housing form in the case where the PLC 13 and the branch protection member 10 circulate, The fibers 8, 9, 11, and 12 may be curled. In any case, since the optical fibers 8, 9, 11, and 12 are holey optical fibers, they can be accommodated with a bending radius of about 5 mm, and the case 2a of the branch core module 2 and the case 3a of the splitter module 3 can be downsized. it can.

A third embodiment of the optical cable connection closure according to the present invention will be described.
As shown in FIGS. 5 and 6, the optical cable connection closure according to the present embodiment has a structure in which the branch core module 2 and the splitter module 3 are fixed to the module housing case 35 to be fixed to the closure housing 1 side. ing. 5 and 6, the same members as those described in FIG. 1 are denoted by the same reference numerals as those used in FIG.

  The optical cable connection closure shown in FIG. 5 is substantially the same as the connection form of the optical cable connection closure shown in FIG. 1 except that the branch core module 2 and the splitter module 3 are fixed to the module storage case 35. Different from the optical cable connection closure shown in FIG.

  Further, the optical cable connection closure shown in FIG. 6 shows a connection form when only a plurality of branch core modules 2 are accommodated in the closure housing 1. In this case, the branch core module 2 is fixed in parallel to the module storage case 35. By using the module storage case 35, the multi-core tape optical fiber 31 of the branch cable 30 connected to the branch core module 2 and the single core core 27 of the drop optical fiber 26 are not entangled and can be visually checked. It is possible to route the tape optical fiber 31 and the drawn core 27 with good performance. In the present embodiment, the case where only a plurality of branch core modules 2 are stored in the closure housing 1 has been described. However, only a plurality of splitter modules 3 may be stored in the closure housing 1. It is.

  When it is necessary to store a large number of branch core modules 2 and splitter modules 3 in the closure housing 1, the plurality of branch core modules 2 and splitter modules 3 are fixed in the module storage case 35 so that the inside of the closure housing 1. Can be used effectively. For example, the number of branch core modules 2 and splitter modules 3 that can be stored can be increased by stacking the module storage cases 35 in multiple stages. Further, the visibility of the storage position of the branch core module 2 and the splitter module 3 in the closure housing 1 is improved.

  As described above, as described in the first to third embodiments, the optical cable connection closure according to the present invention includes the end portions of the optical fibers 8, 9, 11, and 12 connected to the branch protection member 10 and the PLC 13. The optical fiber connectors 4, 5, 6, and 7 are attached to the case 2a of the branch core module 2 and the branch core module 2 and the splitter module 3 fixed to the case 3a of the splitter module 3, and the closure housing 1 The optical connectors 23, 25, and 28 are attached to the ends of the main cable 20, the branch cable 30, and the drop optical fibers 22 and 26 that are introduced into the optical cable 23. The connection and storage of the optical cable can be realized simply by connecting 5,6,7.

  Further, the branching core module 2 and the splitter module 3 provided with the optical connectors 4, 5, 6, and 7 enable the splitter module case 102 (refer to FIGS. 7 and 8) and the light required for the conventional optical cable connection closure. The extra length of the module cord 112 (see FIGS. 7 and 8) that passes through a plurality of multistage cases such as the connector termination case 103 (see FIGS. 7 and 8) becomes unnecessary, and the optical fiber in the closure housing 1 is eliminated. The connection and storage work can be simplified.

  Moreover, the branch fiber module 2 and the splitter module 3 can be reduced in size by making the optical fibers in the branch fiber module 2 and the splitter module 3 into holey optical fibers capable of reducing the bending radius. Further, the closure housing 1 Can also be miniaturized.

  Further, by reducing the size of the branch core module 2 and the splitter module 3, it passes through a plurality of cases such as the splitter module case 102 and the optical connector termination case 103 that are necessary in the conventional optical cable connection closure. In addition to being able to store the extra length of the required module cord 112 in one module storage case 35, a large number of branch core modules 2 and splitter modules 3 are fixed to one module storage case 35. Therefore, the work efficiency of the optical fiber connection and storage work can be improved.

  The present invention can be used, for example, in an optical cable connection closure used when branching, drawing in, or connecting an optical cable.

It is a schematic diagram of the closure for optical cable connection which concerns on 1st Example of this invention. It is a schematic diagram of the various structural examples of the branch core wire module which concerns on the 2nd Example of this invention. It is a schematic diagram of the various structural examples of the 8-branch splitter module which concerns on the 2nd Example of this invention. It is a schematic diagram of the various structural examples of the 4-branch splitter module which concerns on the 2nd Example of this invention. It is a schematic diagram of the optical cable connection closure which concerns on the 3rd Example of this invention. It is a schematic diagram of the optical cable connection closure which concerns on the 3rd Example of this invention. It is a schematic diagram of a conventional optical cable connection closure. It is a schematic diagram of a splitter module case and an optical connector termination case in a conventional optical cable connection closure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Closure housing | casing 2 Branching core module 2a Branching core module case 3 Splitter module 3a Splitter module case 4, 6, 7 Single-fiber optical connector 5 Multi-fiber optical connector 8, 12 Multi-fiber tape optical fiber 9, 11, 12a Single-core optical fiber 10 Branch protection member 13 PLC
35 Module storage case

Claims (4)

A closure housing for storing the connection portion between the optical fiber core wires and the extra length;
At least one of a branch core module having a branch portion for branching a multi-core optical fiber ribbon into a single core inside the closure housing and a splitter module having a splitter for branching and coupling optical signals. Either
A connector for connecting an optical fiber core to at least one of the branch core module or the splitter module;
An optical fiber core optical connector at an end of the optical fiber core;
An optical fiber core connector for the branch core module or the splitter module;
An optical cable connection closure, wherein the optical fiber core optical connector and the optical fiber core connection connector are connected. A connector for inter-module connection is provided on the branch core module or the splitter module,
The optical cable connection closure according to claim 1, wherein the branch core module and the splitter module are connected via the inter-module connector. The optical fiber built into at least one of the optical fiber branch core module or the splitter module is an optical fiber having a hole in a cross section of the optical fiber. An optical cable connection closure as described. The at least one of the optical fiber branch core module and the splitter module is housed and fixed in a housing case, and a plurality of the housing cases are provided inside the closure housing. Item 4. The optical cable connection closure according to any one of items 3 to 4.

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