JPH08213955A - Optical network - Google Patents

Abstract

PURPOSE: To release limitation of installed positions of a branch case to the utmost by reducing remarkably number of joints of pneumatic pipes being components of a pneumatic pipe cable and reducing number of fused connecting positions of optical fiber cores in the case of building up an optical network so as to remarkably reduce the trouble and the cost of the work and decreasing even the shape of the branch case to the utmost. CONSTITUTION: A single pneumatic pipe cable 4 is installed from a start to an end of an optical network without any joint on its way and required numbers of pneumatic pipes 64 being components of the cable 4 for branching are cut off at required positions of the pneumatic pipe cable 4. Each branching pipe 9 is connected to each cut-off pneumatic pipe 6 and an optical fiber unit is connected from the pneumatic pipe 6 at the start of the pneumatic pipe cable 4 through the pneumatic pipe 9 for branching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical network, and more particularly to constructing an optical network by passing an optical fiber unit using a pneumatic pipe cable wired in a predetermined area. Of technology.

[0002]

2. Description of the Related Art Conventionally, in constructing an optical network,
An optical fiber unit may be wired using a pneumatic pipe cable 100 as shown in FIG.

In this type of pneumatic pipe cable 100, for example, a plurality of pneumatic pipes 104 made of a polyethylene tube are arranged around a tension member formed by coating polyethylene on a galvanized steel wire. In addition, an intervening string 106 made of plastic is provided between the pneumatic pipes 104. And
A pressing winding layer 108 made of a plastic tape is provided on these, and a protective sheath 110 made of an aluminum laminate tape and polyethylene is further formed thereon.

Each of the pneumatic pipes 104 constituting the pneumatic pipe cable 100 has, for example, an inner diameter of 6 mm and an outer diameter of about 8 mm. In this example, four are arranged.
There are various numbers.

On the other hand, as an optical fiber unit that runs through the pneumatic pipe 104, there is, for example, one shown in FIG.

In this example, the optical fiber unit 200 includes four optical fiber core wires 202 and three interpositions 204.
A primary coating layer 20 of plastic around the assembly of
6 and a secondary coating layer 208 of expanded polyethylene are sequentially formed, and have an overall outer diameter of about 2 mm.

By the way, conventionally, an optical network has been constructed by passing an optical fiber unit through the pneumatic pipe cable as follows.

FIG. 5 is a system configuration diagram in the case of constructing a star type optical network using a pneumatic pipe cable.

In the figure, 1 is a center in which a communication control device is installed, and 2A to 2C are equivalent to respective nodes, and here are buildings such as buildings.

When the area from the center 1 to the building designated by the reference numeral 2C is a predetermined area for constructing an optical network, the pneumatic pipe cable 4A extends from the center 1 at the beginning of the area to the building 2C at the end. .About.4C are sequentially connected in cascade.

In this case, conventionally, a structure has been adopted in which the center 1 and each of the buildings 2A to 2C are individually connected by using the pneumatic pipe cables 4A to 4C having different numbers of pneumatic pipes.

That is, in the example of FIG. 5, when the center 1 and the building 2A are connected by the pneumatic pipe cable 4A having the four pneumatic pipes 6, this building 2A and the next building 2B are connected. The two are connected by an air transport pipe cable 4B having three air transport pipes 6, and the building 2B and the next building 2C are connected by an air transport pipe cable 4C having two air transport pipes 6 Connecting.

A branch case 8 is provided in each of the buildings 2A to 2C, and in each branch case 8, one of the pneumatic pipes 6 of the pneumatic pipe cables 4A to 4C is used to pull out an optical fiber unit. The required pneumatic pipe 6 is left open and the remaining ends of the pneumatic pipe 6 are connected to each other using a pipe joint 10. Note that the pneumatic pipe 6 at the left end in the figure is a spare and is reserved for future optical network expansion.

In addition, devices (not shown) serving as data terminals are arranged in each of the buildings 2A to 2C. To connect these devices to the center 1, one end of an optical connector 16 is connected to the drawer. The other end of the optical fiber core wire 18 for use in each building 2 is located in the closure 20 at a position indicated by a black circle in the figure.
It is fusion-spliced to an optical fiber core wire 14 for branch wiring, which is laid in advance in A to 2C.

When laying the optical fiber unit, each air feeding pipe 6 is moved from the air feeding pipe cable 4A on the center 1 side to the air feeding pipe cable 4C on the terminal side.
The optical fiber unit as shown in FIG.

When the optical fiber unit is pulled out from each open end of the pneumatic pipe 6 in each branch case 8,
The optical fiber unit 12 is separated for each optical fiber core wire 12 excluding the jacket. Then, to each of the separated optical fiber core wires 12, one end side of the optical fiber core wire 14 for branch wiring is fusion-spliced at a place indicated by a black circle in the drawing.

[0017]

By the way, the optical network having the above configuration shown in FIG. 5 has the following problems.

That is, conventionally, since the center 1 is connected to each of the buildings 2A to 2C individually by using the pneumatic pipe cables 4A to 4C each having a different number of pneumatic pipes 6, The number of connection points between the pneumatic pipes 6 forming the transmission pipe cables 4A to 4C is increased, resulting in an increase in construction cost.

Further, in each of the buildings 2A to 2C, the fusion splicing points of the optical fiber core wires 12, 14, and 18 are branched cases 8.
Since there are two positions inside and inside the closure 20, the connection work takes time.

Moreover, the optical fiber core wires 12, 14, 18
The fusion spliced part of is a straight line in the figure, but when actually wiring, considering tension removal and reconnection,
It is necessary to secure extra length. Therefore, not only in the closure 20, but also in the branch case 8, it is necessary to secure a necessary space for accommodating the extra length portions of the optical fiber core wires 12, 14, and 18, so that the overall shape of the branch case 8 becomes large. ing.

When the shape of the branch case 8 becomes large, it is necessary to install the branch case 8 inside the exclusive wiring shaft of the building so as not to get in the way or to spoil the appearance.
The installation location is limited.

The present invention has been made in order to solve the above-mentioned problems, and when constructing an optical network, the number of connecting points of the pneumatic pipes constituting the pneumatic pipe cable is greatly reduced, and The number of fusion splicing points of the fiber core wire is also reduced to greatly reduce the labor and cost of construction, and the shape of the branch case is made as small as possible so that the restrictions on the installation location of the branch case can be removed as much as possible. The task is to

[0023]

In order to solve the above problems, the present invention provides an optical network constructed by passing an optical fiber unit through a pneumatic pipe cable arranged in a predetermined area. Take the configuration of.

That is, in the optical network of the present invention,
A single line pneumatic pipe cable is connected from the beginning to the end of the area without any connection in the middle, while at the required position in the middle of the pneumatic pipe cable wiring, the number of pneumatic pipes that compose the cable is required for branching. Cut and connect the air feeding pipe for branch wiring individually to each cut air feeding pipe, and from the air feeding pipe on the start end side of the air feeding pipe cable to the optical fiber unit through the air feeding pipe for branch wiring. I am trying to get through.

[0025]

In the above structure, when constructing an optical network, it is sufficient to lay a single-line air-carrying pipe cable from the beginning to the end of the area without any connection, and connect the air-carrying pipe cables to each other on the way. Since there is no need, the number of air pipe connection points is greatly reduced.

Further, at a required position in the middle of wiring of the pneumatic pipe cable, the pneumatic pipes constituting the cable are cut by the required number for branching, and the cut pneumatic pipes are individually branched for wiring. By connecting the air carrying pipe and connecting the air carrying pipe from the start side of the air carrying pipe cable through the air carrying pipe for branch wiring without connection, it is possible to The fusion splicing of the fiber core wire becomes unnecessary. Therefore, the labor and cost of construction can be significantly reduced.

In addition, the branch case provided at the connecting portion of the pneumatic pipes does not require a space for securing the extra length of the optical fiber core, so that the shape of the branch case can be made small and the branch case is relatively free. Can be installed in place.

[0028]

FIG. 1 is a block diagram of an optical network according to an embodiment of the present invention, in which parts corresponding to those of the conventional example shown in FIG.

The optical network of this embodiment is of a so-called star type, and in FIG. 1, reference numeral 1 is a center in which a communication control device is installed, and 2A to 2C correspond to respective nodes. It is a building such as.

When the area from the center 1 to the building with the reference numeral 2C is a predetermined area for constructing an optical network, a single-line pneumatic pipe is provided from the center 1 at the beginning of the area to the building 2C at the end. The cable 4 is wired without any connection.

That is, the pneumatic pipe cable 4 is
This example has four pneumatic pipes 6, and the pneumatic pipe cables 4 are sequentially arranged from the center 1 to the buildings 2A and 2B.
It is wired as it is through the building to the terminal building C.

In each of the buildings 2A to 2C, a branch case 7 is provided at the passage position of the pneumatic pipe cable 6. Then, in each branch case 7, as shown in FIG. 2, among the pneumatic pipes 6 constituting the pneumatic pipe cable 4, only the pneumatic pipe 6 necessary for pulling out the optical fiber unit (here, 1 Only the book) is cut, and one end of a branching air feeding pipe 9 provided in advance in each of the buildings 2A to 2C is connected to the cut air feeding pipe 6 by a pipe joint 10. Further, the remaining air pipe 6 of the air pipe cable 4 which is not cut is passed through the branch case 7 as it is.

The pneumatic pipe 6 at the left end in the figure is a spare,
Reserved for future optical network expansion.

On the other hand, devices (not shown) serving as data terminals are arranged in each of the buildings 2A to 2C. In order to connect these devices to the center 1, one end of the optical connector 16 is connected to the drawer. The other end of the optical fiber core wire 18 for use in is drawn out into the closure 20. Further, the other end side of the pneumatic pipe 9 for branch wiring is also drawn into the closure 20.

When the optical fiber unit is laid, it is shown in FIG. 4 through the air feeding pipes 6 and the air feeding pipes 9 for branch wiring from the center 1 side to the terminal side of the air feeding pipe cable 4. Such an optical fiber unit is pneumatically fed.

When the optical fiber unit is pulled out from each open end of the air pipe 9 for branch wiring at each closure 20, the optical fiber unit is separated for each optical fiber core wire 12 except for the jacket. To do. Then, with respect to each of the separated optical fiber core wires 12, one end side of the optical fiber core wire 18 for drawing out is fusion-spliced at a portion indicated by a black circle in the drawing.

In the above structure, the air carrying pipe cables 4 of a single line may be wired from the beginning to the end of the area of the optical network without any connection. Since there is no connection between the air carrying pipe cables, there is no connection point. Significantly less.

Further, since the optical fiber unit is passed from the pneumatic pipe 6 of the pneumatic pipe cable 4 through the pneumatic pipe 9 for branch wiring, the optical fiber core wire is provided at the connection point between the pneumatic pipes 6 and 9. No need for fusion splicing. Therefore, the labor and cost of construction can be significantly reduced.

Moreover, since the branch case 7 provided at the connection between the pneumatic pipes 6 and 9 does not require a space for securing the extra length of the optical fiber core, the shape of the branch case 7 can be made small and each building can be constructed. The branch case 7 can be installed in a relatively free place within 2A to 2C.

In the above configuration, in the pneumatic pipe cable 4, the optical fiber unit is not routed from the center 1 side to the pneumatic pipe 6 which is cut midway. If the data processing devices are installed in the building of the code 2A and the building of the code 2B, respectively, by arranging the optical fiber units in the order of the codes a to d, it is possible to construct another optical network, which is useful. .

In this embodiment, each building 2 such as a building is
The case where the pneumatic pipe cable 4 is laid for A to 2C has been described, but the present invention is not limited to this.
For example, the present invention can be applied to the case where the pneumatic pipe cable 4 is laid on each floor in one building.

Further, in this embodiment, in order to facilitate the explanation, the four-fiber optical fiber unit is used for the three buildings 2A to 2C by using the pneumatic pipe cave 4 provided with the four pneumatic pipes 6. Although the description has been given by taking as an example the case where the optical fiber unit composed of is wired, the present invention is not limited to this.

[0043]

According to the present invention, the following effects can be obtained.

(1) When constructing an optical network, it suffices to connect single-line pneumatic pipe cables from the beginning to the end of the area without connection, and it is necessary to connect the pneumatic pipe cables to each other on the way. Since there is no such connection, the number of connecting points of the pneumatic pipe is significantly reduced. In addition, since the fusion splicing of the optical fiber cores is not required at the connection point between the pneumatic pipes, the labor and cost of the construction can be significantly reduced as compared with the conventional case.

(2) Since the branch case provided at the connecting portion of the pneumatic pipes does not require a space for securing the extra length of the optical fiber core, the shape of the branch case can be made small and the branch case is relatively free. It can be installed in various places.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical network according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a pneumatic pipe cable in a branch case in the configuration of FIG.

FIG. 3 is a cross-sectional view showing an example of a pneumatic pipe cable.

FIG. 4 is a cross-sectional view showing an example of an optical fiber unit.

FIG. 5 is a configuration diagram of a conventional optical network.

[Explanation of symbols]

1 ... Center, 2A to 2C ... Building, 4 ... Pneumatic pipe cable, 6 ... Pneumatic pipe, 7 ... Branch case, 9 ... Pneumatic pipe for branch wiring, 100 ... Pneumatic pipe cable, 200 ...
Optical fiber unit.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04B 10/12 10/02 10/20 H04B 9/00 N

Claims (1)

[Claims] 1. An optical network constructed by passing an optical fiber unit through a pneumatic pipe cable arranged in a predetermined area, wherein the pneumatic pipe cable is a single line from the beginning to the end of the area. In the meantime, while disconnecting the air-conducting pipes, the air-conducting pipes are cut at a required position in the middle of the air-conducting pipes by cutting the number of air-conveying pipes required for branching. An optical network, wherein an air carrying pipe for branch wiring is connected to, and an optical fiber unit is routed from the air carrying pipe on the start side of the air carrying pipe cable through the air carrying pipe for branch wiring.