JPH09197167A - Optical branch connection box - Google Patents

Abstract

(57) [Summary] [Problem] It was difficult to downsize a conventional optical branching junction box. An optical branch for switchably connecting a first optical fiber core wire (62) derived from a first optical fiber cable (60) and a second optical fiber core wire (72) derived from a second optical fiber cable (70). The connection box 50 is a storage box 61 for storing the first optical fiber core wire 62, and one end thereof is connected to the first optical fiber core wire 62 by fusion splicing in the storage box 61, And a jumper cord 65 whose other end is connected to the second optical fiber core wire 72 so that the connection can be switched, and at least a part of the connection extra length of the jumper cord 65 is a state where the core wire is exposed. It is stored in the storage box 61.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical branch / junction box for switchably connecting optical fiber cables.

[0002]

2. Description of the Related Art In general, when branching an optical fiber cable to an optical fiber core by optical connection, an optical branching connection box is used in which a large number of optical fiber cores are terminated to form a group. .

An example of a conventional optical branching and connecting box will be described with reference to FIG. FIG. 6 shows the conventional optical branching connection box 1 by focusing on one optical fiber cable. Reference numeral 10 is a trunk cable, 11 is a trunk side storage box, 20 is a termination cable, and 21 is a termination side. The storage box is shown.

The trunk side storage box 11 stores therein an optical fiber core wire 12 led out from the trunk cable 10 and a jumper cord 15. The optical fiber core wire 12 is, for example, of a 4-core type, and its connecting end has a 4-core MT (Mechanically Transfer).
The connector 12a is attached. The jumper cord 15 has an MT connector 15a with one end for four cores.
And the other end is made into four SC connectors 15c via the branch portion 15b from the four cores to the single core. And
The optical fiber core wire 12 and the jumper cord 15 are connected to each other by connecting the MT connectors 12a and 15a.

On the other hand, the termination side storage box 21 has an SC wall 21a attached to the outer wall thereof,
The optical fiber core wire 22 led out from the termination cable 20 and the connecting cord 25 are housed therein. Optical fiber core 2
2 is, for example, a 4-core type, and a 4-core MT connector 22a is attached to its connection end.
The connecting cord 25 has the same structure as the jumper cord 15, and has one end serving as an MT connector 25a for four cores.
The other end is made into four SC connectors 25c via the branching portion 25b from the four cores to the single core. The optical fiber core wire 22 and the connecting cord 25 are connected to each other by the MT connector 22.
a and 25a are connected to each other. Furthermore, the SC connector 25c of the connecting cord 25
Is inserted into the SC adapter 21a.

Based on the above construction, the SC connector 15c of the jumper cord 15 is appropriately connected to the SC of the termination side storage box 21.
By being inserted into the adapter 21a, the connection between the optical fiber core wires 12 and 22 can be switched.

Further, the optical branch connection box 1'in FIG.
It is smaller than the optical branching / connection box 1 and is for connecting the optical fiber core wire 32 led out from the trunk cable 10 and the floor cable 42.

In the optical branch connection box 1 ', the storage box 31
Accommodates the optical fiber core wire 32 and the connecting cord 35 therein. The optical fiber core wire 32 is, for example, of a 4-core type, and a 4-core MT connector 32a is attached to the connection end thereof. Connection cord 35
Has an MT connector 35a for four cores at one end, and a four-core MT connector 35c at the other end via a branch portion 35b from the four cores to the single core. The floor cable 42 has a single core.

The optical fiber core wire 32 and the connecting cord 35 are connected to each other by connecting the MT connectors 32a and 35a. Further, the MT connector 35c of the connecting cord 35 is connected to the floor cable 42.

Under the above-mentioned structure, the optical fiber core wire 32 and the floor cable 42 are connected via the connecting cord 35.

[0011]

As shown in FIG. 7, the jumper cable 15 has a tube 16a around the 4-core tape core wire 16 between the MT connector 15a and the branch portion 15b. Between the branch portion 15b and the SC connector 15c, the circumference of the single core wire 17 is covered with a tube 17a so as to be coded. As a result, the jumper cable 15 becomes thick, and the extra connection length of the jumper cable 15 is reduced to the trunk side storage box 1.
It would have been very bulky when housed in 1. Therefore, there is a problem that it is difficult to reduce the size of the main line side storage box 11. This situation is exactly the same for the connecting cable 25, and thus there is a problem in that it is also difficult to downsize the termination-side storage box 21. Since the optical branch connection box 1 is equipped with a large number of trunk side storage boxes 11 and termination side storage boxes 21, it is difficult to downsize the optical branch connection box 1 after all. The same situation applies to the optical branch connection box 1 ', and downsizing of the optical branch connection box 1'is also difficult.

Moreover, in the above-described optical branching connection boxes 1 and 1 ', since many MT connectors are used, there is a problem that the entire apparatus becomes expensive.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an optical branching connection box that can be downsized by reducing the size of each storage box and can reduce the cost. And

[0014]

According to another aspect of the present invention, there is provided an optical branching / junction box in which a first optical fiber core wire derived from a first optical fiber cable and a second optical fiber core wire derived from a second optical fiber cable are provided. An optical branching connection box for switchingably connecting an optical fiber core wire, comprising: a storage box for storing the first optical fiber core wire; and one end of the first optical fiber core in the storage box. A jumper cord connected to the wire by fusion splicing or mechanical splice connection, and the other end of which is connector-switchable to the second optical fiber core wire. The length is characterized in that at least a part of the length is stored in the storage box with the core wire exposed. According to a second aspect of the present invention, there is provided an optical branch / connection box according to the first aspect of the present invention, wherein the jumper cord is composed of an optical fiber core wire having a diameter of 0.25 mm or more. In the optical branching / junction box according to claim 3, the first optical fiber core wire derived from the first optical fiber cable and the second optical fiber core wire derived from the second optical fiber cable can be switched. An optical branch connection box for connection, wherein the first optical fiber core wire is a single core and is directly connected to the second optical fiber core wire so as to be connectable and switchable. Is characterized by.

According to the first aspect of the present invention, since the connection extra length of the jumper cord is stored in the storage box with at least a part of the jumper cord exposed, the extra connection length of the jumper cord is large. It is possible to make the storage box small without being bulky. Therefore, the size of the optical branch connection box can be reduced. Further, since the optical fiber cores are connected to each other by fusion splicing or mechanical splice connection, the cost is relatively reduced as compared with the case where the MT connector is used. According to the invention of claim 2, the jumper cord has a diameter of 0.25 mm.
Since it is composed of the above-mentioned optical fiber core wire, it is reasonably possible to store it in the storage box with the core wire exposed without the need for coding with a tube. According to the invention of claim 3, since the first optical fiber core wire is a single core and is directly connected to the second optical fiber core wire so that the connection can be switched,
The structure is simple, the size can be reduced, and the cost can be reduced.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an optical branching and connecting box of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 shows a first embodiment of an optical branching / junction box of the present invention. In this case, it should be noted that FIG. 1 shows the optical branch junction boxes 50 and 50 ′ focusing on one optical fiber cable.

First, the optical branch connection box 50 will be described. In the figure, reference numeral 60 is a trunk cable (first optical fiber cable), 61 is a trunk side storage box (storage box), 7
0 is a termination cable (second optical fiber cable), 71
Indicates the termination side storage box.

The trunk side storage box 61 houses therein an optical fiber core wire (first optical fiber core wire) 62 led out from the main cable 60 and a jumper cord 65.
The optical fiber core wire 62 is of a four-core type, for example. The jumper cord 65 is composed of four single-core fibers having a diameter of 0.25 mm, and one end thereof has an optical fiber core wire 62.
Is a fusion-splicing portion 65a, and the other end is four SC connectors 65b. The optical fiber core wire 62 and the jumper cord 65 are connected to each other by being fusion-bonded at the fusion-splicing portion 65a.

Here, the configuration of the jumper cord 65 will be described in detail with reference to FIG. FIG. 2 is a diagram showing the jumper cord 65 for convenience of development. In the figure, the jumper cord 65 is arranged between the fusion splicing portion 65a and the SC connector 65b in order from the fusion splicing portion 65a side.
The assembly tape forming portion 66, the core wire bare portion 67, the nylon coating portion 68, and the cord portion 69 are provided. In this case, it should be noted that the core wire bare portion 67 and the cord portion 69 are omitted in the middle for convenience of illustration. The collective tape forming section 66 is an area in which four core wires are bundled. The core wire bare portion 67 has a diameter of 0.25 mm and is 4
This is a region where the single-core fiber of the book is exposed, and the core-bar exposed portion 67 is accommodated in the trunk-side storage box 61 as a connection extra length. As described above, it is possible to realize that the core wire is exposed and stored in the storage box because the diameter of the core wire is 0.25 mm (or a diameter larger than this). There is. In this case, if the diameter of the core wire is smaller than 0.25 mm, the mechanical strength of the core wire itself becomes weak, and it becomes difficult to store the connection extra length in the storage box in the exposed state. The nylon coating portion 68 is an area where the core wire is coated with a thin nylon coating. The cord portion 69 is a region in which the core wire is coated with a relatively thick tube and is coded, and is mainly arranged outside the main line side storage box 61.

On the other hand, the termination side storage box 71 has the SC adapter 71a attached to the outer wall thereof,
The optical fiber core wire 72 led out from the termination cable 70 is stored. The optical fiber core wire 72 is of a 4-core type, for example, and is branched into a single core in the termination-side storage box 71, and an SC connector 72a is attached to each of the connection ends that are formed into a single core. . Then, these SC connectors 72a are inserted into the SC adapter 71a.

Here, referring to FIG. 3, the termination side storage box 7
The configuration example 1 will be described in detail. Termination side storage box 7
1 is composed of a storage box main body 71b and a cover 71c, and in FIG. 3, for convenience, the cover 71c is shown in a state of being moved upward. The storage box main body 71b is provided with a reel 71d for winding the extra connection length, a projecting piece 71e for locking the core wire, a core wire clamp portion 71f for clamping the core wire, and the like. After each optical fiber core wire 72 is introduced into the storage box body 71b,
The reel 71d is wound to adjust the extra connection length, and a single core is branched in the middle of the reel 71d to be clamped by the core wire clamp portion 71f. Finally, the SC connector 72a is SC.
It is plugged into the adapter 71a.

Based on the above configuration, the SC connector 65c of the jumper cord 65 is appropriately connected to the SC of the termination side storage box 71.
By being inserted into the adapter 71a, the connection between the optical fiber core wires 62 and 72 can be switched.

Further, FIG. 4 schematically shows the overall structure of the optical branching / connecting box 50. Note that, in FIG. 4, for convenience, the front door is removed. As shown in the figure, the trunk cable 60 and the termination cable 70 are
It is inserted into the optical branching connection box 50 from below and is clamped by the cable clamp 50a. The trunk-side storage boxes 61 are stacked in multiple stages, and the jumper wires 6 are arranged laterally toward the termination side.
5 has been pulled out. Furthermore, the termination side storage box 71 is
In addition to being stacked in multiple stages, they are arranged in an orderly manner with the SC adapter 71a facing the front side so as to facilitate connection switching of the jumper wires 65 by the SC connector 65b.

It should be noted that, as compared with the termination side storage box 71, the main line side storage box 61 is provided with a clamp portion for the introduction guide portion 61a, the extraction guide portion 61b, and the fusion splicing portion 65a. The configuration is basically the same except that the SC adapter is not provided on the outer wall.

According to the above-described optical branch connection box 50, the jumper cord 65 is housed in the trunk side storage box 61 mainly with the core wire bare portion 67 as a connection margin, so that the jumper cord 65 has a connection margin. However, the trunk side storage box 61 can be made small, and the optical branching connection box 50 can be made compact. Further, since the connection between the optical fiber core wire 62 and the jumper cord 65 is made by fusion splicing, the cost can be relatively reduced as compared with the case where the MT connector is used.

Moreover, since the jumper cord 65 is composed of an optical fiber core wire having a diameter of 0.25 mm, it does not need to be coded by a tube, and the main wire side storage box 61 with the core wire exposed is provided. It can be easily stored inside.

Now, next, the optical branch connection box 5 shown in FIG.
0 'will be described. The optical branch connection box 50 ′ is smaller than the optical branch connection box 50, and is for connecting the optical fiber core wire 82 led from the trunk cable 60 and the floor cable 92.

In the optical branch connection box 50 ', a storage box 81
The optical fiber core wire 82 and the connecting cord 85 are housed inside. The optical fiber core wire 82 is of a four-core type, for example. The connecting cord 85 has a diameter of 0.2.
The optical fiber core wire 82 is mechanically spliced at one end to the optical fiber core wire 82 at the optical connection portion 85a, and the other end is the floor cable 9.
2 is mechanically spliced at the optical connecting portion 85b. The floor cable 92 has a single core.

Under the above structure, the optical fiber core wire 82 and the floor cable 92 are connected via the connecting cord 85.

The optical branching / connecting box 50 'can achieve the same effects as the optical branching / connecting box 50.
That is, since the connecting cord 85 does not become bulky like the jumper cord 65, the individual storage boxes 8
1 can be made smaller, so that the optical branch connection box 5
A miniaturization of 0'can be achieved. In addition, since the MT connector is not used and the mechanical splice connection is used, the cost can be reduced.

[Second Embodiment] FIG. 5 shows a second embodiment of the optical branching / junction box of the present invention. In this case, it should be noted that FIG. 2 shows the optical branch / junction box 100, 100 ′ in the same manner as FIG. 1, focusing on one optical fiber cable. The present embodiment shows a configuration example in the case where the main cable is composed of a single core wire.

First, the optical branch connection box 100 will be described. In the figure, reference numeral 110 is a trunk cable (first optical fiber cable), 120 is a termination cable (second optical fiber cable), and 121 is a storage box.

The optical fiber core wire 112 is composed of a single core wire. The SC connector 112a is attached to the connection end of the optical fiber 112.
The storage box 121 has the SC adapter 121a attached to the outer wall thereof, and stores the optical fiber core wire 122 led out from the termination cable 120 therein. The optical fiber core wire 122 is of a four-core type, for example, is single-branched in the storage box 121, and an SC connector 122a is attached to each of the single-core connection ends. Then, these SC connectors 122a are
It is plugged into the SC adapter 121a.

Based on the above configuration, the optical fiber core wire 112
The SC connector 112a of the
The connection between the optical fiber core wires 112 and 122 is made switchable by inserting into the SC adapter 121a.

In the above-described optical branching connection box 100, the optical fiber core wire 112 has a single core and is directly connected to the optical fiber core wire 122 by the SC connector so that the connection can be switched. The structure can be simplified and the size can be reduced. In addition, the cost reduction can be relatively achieved by using the connector connection by the SC connector without using the MT connector.

Next, the optical branch connection box 100 'shown in FIG. 5 will be described. The optical branching junction box 100 'is smaller than the optical branching junction box 100, and the trunk cable 1
It is for connecting the optical fiber core wire 132 led out from 10 and the floor cable 142.

In the optical branch connection box 100 ', the storage box 1
An optical fiber core wire 132 is housed inside 31. Optical fiber core wire 132 and floor cable 142
Is composed of a single-core fiber. The optical fiber core wire 132 and the floor cable 142 are connected by a mechanical splice at the optical connection portion 132a.

In the optical branching / junction box 100 ', the structure can be further simplified and the size can be reduced.
In addition, a relative cost reduction can be achieved by using a mechanical splice connection instead of using the MT connector.

The present invention is not limited to the above-described embodiment, and the following modifications do not depart from the gist of the present invention. a) As the optical fiber cable, use any type of optical fiber cable having various materials and configurations. b) As the optical fiber cable, the single core and the four cores are illustrated, but instead of this, use an optical fiber cable having an arbitrary number of cores. In this case, it goes without saying that the design is appropriately changed according to the number of core wires used. c) The fusion-splicing portion in the first and second embodiments is changed to a SC connector connection or a mechanical splice connection. d) Changing the connection portion by the mechanical splice in the first and second embodiments to fusion connection or connection by SC connector. e) Instead of the jumper cord 65 or the like having the configuration shown in FIG. 2, it may have any other desired configuration. However, in this case, it is needless to say that the portion accommodated as the extra connection length in the accommodation box is mainly the core wire bare portion. f) In the jumper cord 65 etc., the diameter is 0.25 m
Instead of using m fiber optic cores, use fiber optic cores with a diameter greater than 0.25 mm.

[0041]

According to the optical branch / junction box of the present invention, the following effects can be obtained. According to the optical branch connection box of claim 1,
The connection length of the jumper cord is stored in the storage box with at least a part of the core wire exposed.
The extra connection length of the jumper cord is not bulky, and the storage box can be made small, so that the optical branching connection box can be miniaturized. Further, since the optical fiber cores are connected to each other by fusion splicing or mechanical splice connection, the cost can be relatively reduced as compared with the case where the MT connector is used. According to the optical branch connection box of claim 2, since the jumper cord is composed of an optical fiber core wire having a diameter of 0.25 mm or more, the core wire is exposed without coding with a tube. The storage in the storage box in the state can be realized without difficulty. According to the optical branching / junction box of claim 3, the first optical fiber core is a single core and is directly connected to the second optical fiber core so that the connection can be switched. Therefore, the configuration can be simplified, the size can be reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of an optical branching / junction box of the present invention. In this case, the optical branching junction box is shown focusing on only one optical fiber cable.

FIG. 2 is a development view of the jumper code in FIG.

FIG. 3 is a perspective view showing a termination side storage box in FIG.

FIG. 4 is a front view schematically showing the overall configuration of the optical branch connection box in FIG. In this case, for convenience, the front door is removed.

FIG. 5 is an explanatory view showing a second embodiment of the optical branching / junction box of the present invention. In this case, the optical branching junction box is shown focusing on only one optical fiber cable.

FIG. 6 is an explanatory diagram showing a configuration example of a conventional optical branching / junction box. In this case, the optical branching junction box is shown focusing on only one optical fiber cable.

7 is a development view of the jumper code in FIG.

[Explanation of symbols]

50 ... Optical branch connection box, 60 ... Trunk cable (first optical fiber cable), 61 ... Trunk side storage box (storage box), 6
5 ... Jumper cord, 70 ... Termination cable (second optical fiber cable), 100 ... Optical branch connection box, 110 ... Trunk cable (first optical fiber cable), 120 ... Termination cable (second optical fiber) cable).

Claims (3)

[Claims] 1. A first optical fiber core (62) derived from a first optical fiber cable (60) and a second optical fiber core (72) derived from a second optical fiber cable (70). Optical branching connection box (5
0), which is a storage box (6) for storing the first optical fiber core wire.
1) and one end is connected to the first optical fiber core wire by fusion splicing or mechanical splice connection in the storage box, and the other end is connected to the second optical fiber core wire for connection switching And a jumper cord (65) which is connected to the connector so that the jumper cord is stored in the storage box in a state where at least a part of the connection length of the jumper cord is exposed. Optical branch connection box. 2. The optical branch connection box according to claim 1,
The jumper cord (65) is composed of an optical fiber core wire having a diameter of 0.25 mm or more. 3. A first optical fiber core (112) derived from the first optical fiber cable (110) and a second optical fiber core (122) derived from the second optical fiber cable (120). An optical branching connection box (100) for switchably connecting and, wherein the first optical fiber core wire is a single core, and the connection is switched directly to the second optical fiber core wire. An optical branching connection box characterized by being connected to a connector as much as possible.