JPH1090524A - Optical wiring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical wiring system which improves the degree of freedom in the connecting position of an optical fiber and optical cable on an optical terminal apparatus side and connection workability and enables connection work at all times regardless of climatic conditions. SOLUTION: This optical wiring system has the optical cable 3 laid underground, an optical cable terminal 5 risen onto the ground directly from the optical cable 3 or through a branch connecting box 4 and an optical terminal 29 which terminates the optical cable terminal 5 connectably with another optical fiber 22. The optical terminal 29 is installed upper than the ground surface T, by which the easy connection of the optical fiber 22 on a user side to the optical line on the optical cable 3 side is made possible. Even more, the optical terminal does not hinder the traffic above the ground and is not affected by flooding, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical wiring system capable of extracting optical information, and more particularly to an optical wiring system using an optical terminal.

[0002]

2. Description of the Related Art In an optical wiring system capable of extracting optical information, a handhole cover, for example, is considered as a structure to which an optical terminal (for example, an optical connector) is attached. FIG.
Is a handhole with an optical connector attached to the lid, Figure 1
Numeral 0 denotes an elevating device for the lid of the handhole. In the figure, reference numeral 1
Is a handhole, 2 is a cover, 3 is an optical cable, 4 is a closure, 5 is a branch cable branched from the incoming optical cable 3 in the closure 4, 6 is a closing plate, 7 is a lifting device, and 8 is an optical connector. The elevating device 7 includes an outer cylinder 9 attached to be suspended from the lid 2, an inner cylinder 10 housed inside the outer cylinder 9 so as to be able to move up and down, and the inner cylinder 10 stored in the outer cylinder 9. It is provided with a closing plate 6 which sometimes seals a hole 11 opened in the lid 2. The optical connector 8 is a waterproof optical connector and is housed in the inner cylinder 10. The inner cylinder 10 can be protruded and retracted above the lid 2 by lifting and lowering.
The optical connector 8 is exposed to the ground when the projection 0 is projected above the lid 2, and the optical connector 8 is used while maintaining this state.

[0003]

By the way, in the case of the elevating device 7 as described above, the handhole 1 is installed mainly on the road and is lifted so that it can be easily seen when used. There was a problem of becoming.
Further, even if a handhole provided outside the road is used, it becomes difficult to use it in snow, freezing, flooding, and the like. Further, in order not to affect the traffic on the handhole 1, it is necessary to make the elevating device 7 a strong structure, and when the inner cylinder 10 is stored, it is necessary to secure the waterproofness of the hole 11; The structure of the connector 8 is time-consuming to expose, and there are many disadvantages in economical efficiency. In particular, in the case of using an existing handhole, the cost increases because the case of replacing the cover with a new cover occurs in view of the time required for forming the hole 11 in the cover and installing the elevating device 7. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and improves the degree of freedom and the connection workability of a connection position between an optical fiber and an optical cable on the side of an optical terminal device. It is an object of the present invention to provide an optical wiring method which can be always performed regardless of the method.

[0005]

According to the first aspect of the present invention, there is provided an optical cable laid underground, an optical cable terminal set up directly from the optical cable or on the ground via a branch junction box, and the optical cable. An optical wiring system having an optical terminal that terminates a terminal so that it can be connected to another optical fiber and that is installed above the ground surface is a means for solving the problem.

According to the present invention, by laying the optical cable terminal set up on the ground along a supporting structure such as a telephone pole, the optical terminal of the optical cable terminal is installed above the ground surface. In use, the optical fiber is connected to the optical line on the optical cable only by connecting the optical fiber on the user side to the optical terminal. It is preferable to apply an optical connector to the optical terminal, for example, and it is preferable to store and protect the optical terminal in an optical terminal box. The installation position of the optical terminal is preferably a place that is several meters above the ground surface and is not affected by snow or flooding if it is outdoors. By doing so, it is possible to maintain the optical characteristics of the optical terminal while avoiding the effects of snow, freezing, submergence, and the like, and it is also possible to avoid obstruction of traffic. Optical terminals are
Preferably, it is waterproof, and by doing so,
The optical characteristics of the optical terminal can be maintained more reliably.

[0007] According to the second aspect of the present invention, an optical cable terminal, an optical cable terminal pulled down from the overhead optical cable directly or via a branch junction box between the overhead cable and the ground surface, and the optical cable terminal And an optical terminal that is connected to another optical fiber, and the optical terminal is installed above the ground surface.

According to the present invention, by simply connecting an optical fiber to the optical cable terminal pulled down between the overhead cable and the ground surface via the optical terminal, the optical fiber is connected to the optical line on the overhead optical cable side. Connected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an optical wiring system according to the present invention will be described below with reference to FIGS. In the drawings, the same components as those in FIGS. 9 and 10 are denoted by the same reference numerals, and description thereof will be simplified. In FIG. 1, reference numeral 20 denotes an optical terminal box, 21 denotes an optical terminal device (relay van), 22 denotes an optical fiber (optical cable), 23 denotes a support structure (post), and 24 denotes a drum. In FIG. 1, an optical terminal box 20 is fixed at a position slightly higher than the ground surface T above an upright supporting structure 23, and a closure 4 in which various optical components and connecting portions are stored. The terminal of the branch cable 5 (cable terminal) branched from the optical cable 3 is drawn in (branch connection box). The branch cable 5 is drawn out from the side of the handhole 1, inserted through the lower end of the support structure 23, and guided to the optical terminal box 20. Further, in the closure 4, (1) the branch cable 5 side and the line side optical cable 3 are connected by an optical coupler, and optical information is transmitted via the optical coupler.
(3) connecting a branching optical fiber to the optical cable 3 through fusion or connector connection. . On the other hand, the optical fiber 22 drawn from the optical terminal device 21 is routed to the optical terminal box 20 via the drum 24 installed below the support structure 24.

Next, a specific configuration of the optical terminal box 20 will be described with reference to FIG. In FIG. 2, reference numeral 25 denotes a box main body, 26 denotes a mounting bracket, 27 denotes an inlet (sealing introduction metal fitting), 28 denotes a cable gripping metal, and 29 denotes an optical connector (optical terminal) for terminating the branch cable 5. In the case of a heart, for example, an SC type optical connector is used. In addition, as a form of the optical connector, various types of connectors such as a type in which the left and right optical connector plugs of the center adapter are coupled, or a receptacle type can be adopted. This is the same in the following embodiments. The box main body 25 has a rectangular parallelepiped appearance, and is attached to and detached from the support structure 23 by the mounting bracket 26. The box body 25 is opened and closed by a hinge 30.
When the opening / closing member 31 is closed, the entire waterproof property is maintained, and when the opening / closing member 31 is opened, work in the box main body 25 becomes possible. The sealing introduction fitting 27 is a component for introducing the branch cable 5 and the optical fiber 22 of the optical terminal device 21 into the box main body 25, and is attached to the lower wall 32 of the box main body 25. This sealing introduction fitting 27
Has built-in sealing parts such as packing (not shown),
The branch cable 5 and the introduction portion of the optical fiber 22 are kept watertight. The cable holding fitting 28 holds and fixes the ends of the branch cable 5 and the optical fiber 22 in the box body 25.

A plurality of single-core or multi-core optical connectors 29 are fixed to the back plate 33 of the box body 25 and housed in the box body 25. Each of these optical connectors 29 is a single-core or multi-core optical fiber core wire 34, 3, which is drawn from the branch cable 5 or the end of the optical fiber 22 in the box body 25.
By inserting optical connector plugs 36 and 37 terminating the optical fiber 5 from both sides, the optical fibers 34 and 35 are optically connected. These optical connectors 29 are arranged up and down,
Since the optical connection axis of each optical connector 29 is horizontal, the optical fiber cores 34 drawn from both optical cables 5 and 22 can be used.
Even if there are a large number of 35s, they can be arranged and housed in the box body 25 without causing entanglement or the like.
Note that the branch cable 5 and the optical fiber 22 are preferably optical cables with connectors. In this case, the work of connection and the like can be performed quickly and simply simply by drawing the optical cable into the optical terminal box 20.

In the optical wiring system of this embodiment, first, the box main body 25 is fixed to the support structure 23, and the opening / closing member 31 is opened to pull the branch cable 5 from the support structure 23 into the box main body 25. Is gripped and fixed by the cable gripping metal fitting 28, and the optical fiber core 34 is inserted into one side of the optical connector 29, thereby assembling. The installation position of the optical terminal box 20 is preferably a height of about several meters from the ground surface T, so that it does not obstruct the traffic on the ground and does not hinder the carry-in of the optical terminal device 21. Also, the effects of snow and flooding can be avoided.

The optical fiber 22 of the optical terminal device 21 is pulled in from the inlet 27, the opening / closing member 31 is opened, and the optical connector plug 37 of each optical fiber core 35 is inserted into the optical connector 29. 34 and 35 are connected to each other, and the optical terminal device 21 can be connected to a target optical line on the optical cable 3 side.

The box body 25 exhibits a high water-blocking property when the opening / closing member 31 is closed, so that the optical characteristics of the optical components such as the optical connector 29 housed therein can be stably maintained. Also, by installing the optical component above the support structure 23, it is possible to protect the stored optical components even in the case of snowfall, flooding, etc.
The optical fiber 22 on the side of the optical terminal device 21 can be connected at any time as long as can be opened and closed.

The supporting structure includes the support 23
Alternatively, for example, as shown in FIG. 3, it is also possible to use the wall of the house 23a. Further, as the opening / closing member, a double door, a sliding closing plate, a detachable closing plate, or the like can be applied.

FIGS. 4 and 5 show a second embodiment of the present invention. In the figure, reference numeral 40 denotes an optical terminal box, 41 denotes a box main body, and 42 denotes an optical connector (optical terminal, multi-core optical connector). As shown in FIG. 4, the box main body 41 accommodates the branch cable 5 that is drawn inside and curved in a U-shape. The distal end of the branch cable 5 is terminated so as to be connectable to another optical fiber by an optical connector 42 detachably attached to a drop-in port 45 opened in a lower wall 43 of the box body 41. The optical connector 42 has a terminal that can be exposed below the lower wall portion 43 (the lower side in FIG. 4), and is branched from the optical fiber 22 by inserting the optical fiber 22 of the optical terminal device 21 from below. Connect the cable 5.

According to the optical wiring system of this embodiment, after the optical fiber 22 is inserted into the optical connector 42 and the two optical cables 5 and 22 are connected, the opening / closing member (door) 46 is opened as shown in FIG. Then, the optical connector 42 is detached from the inlet 45 and is pulled into the box main body 41 together with the optical fiber 22 and stored. Therefore, the optical fiber 22 is connected to the optical connector 4.
Since the two optical cables 5 and 22 can be simply connected simply by inserting them into the cable 2, the workability of the connection is greatly improved. Further, by pulling the optical connector 42 into the box main body 41 after the connection work, the connection portion between the two optical cables 5 and 22 is protected, so that the connection state can be stably maintained. The extra length 44 of the optical cable 5 is stored in a wound state as the optical connector 42 is pulled in.

When the optical connector 42 is detached from the lower wall 43, the optical connector 42 can be moved within the extra length 44 of the branch cable 5 secured in the box main body 41, and the optical connector 42 is moved to the box main body. Since the connection work can be performed even when the length of the optical fiber 22 on the side of the optical terminal device 21 is not enough, the connection work can be further improved.

FIGS. 6 and 7 show a third embodiment of the present invention. 6, 50 is an optical terminal box, 51 is an aerial optical cable,
52 is a branch connection box (aerial closure), 53 is a cable terminal (branch cable), 54 is a support structure (support line),
55 is a support structure (post). In FIG. 6, the optical terminal box 50 is suspended from a supporting structure 54 that bears the tension of the overhead optical cable 51, and the branch cable 53 branched from the overhead optical cable 51 by the overhead closure 52.
And an optical fiber 22 drawn out of the optical terminal device 21 are introduced from both left and right opposite sides. The branching method in the overhead closure 52 includes (1) branching by an optical coupler, (2) direct dropping of an optical fiber from the feeder overhead optical cable 51, and (3) connection of a branching optical fiber by fusion or connector connection. It is. The optical fiber 22 on the side of the optical terminal device 21 is routed from the ground surface T to the optical terminal box 50 along the side of the support column 55 via the upper portion of the support column 55.

In FIG. 7, the optical terminal box 50 is
6, a box body 57, an inlet (sealing introduction metal fitting) 58,
An optical connector (optical terminal, multi-fiber optical connector) 59 and a cable grip 60 are provided. The optical connector 59 is provided with an inlet 6 opened in the side plate 61 in the box body 57.
3 and detachable from the side plate 61, it can be moved within the range of the surplus length 62 of the branch cable 53 secured in the box body 57, and corresponds to the length of the optical fiber 22 on the optical terminal device 21 side. Thus, the connection position between the optical fibers 22 and 53 can be adjusted. Operations such as connection between the optical fiber 22 and the branch cable 53 are performed by opening the opening / closing member (door) 64.

According to this embodiment, since the installation position of the optical terminal box 50 is free within the range of the support structure 54,
It can be installed without problems even in a place away from 5.
Accordingly, the support can be installed even in a place where the support 55 is difficult to be erected, and the degree of freedom of the connection position between the optical terminal device 21 and the optical line on the optical cable 51 side is improved. Further, since the branch cable 53 erected along the support structure 54 may be drawn into the box main body 57, the useless length of the branch cable 53 can be reduced, and the cost can be reduced. Note that the optical terminal box 50 can use an internal structure for connecting optical fiber cores drawn from terminals of the optical cables 22 and 53 using an SC type optical connector.

FIG. 8 shows a fourth embodiment of the present invention. FIG.
In, the optical terminal box 50 is attached to a wall 65 (support structure) of a house. The mounting position of the optical terminal box 50 to the support structure 65 may be on either side of the inside or outside of the house. If it is inside, the optical characteristics of the optical connector 59 and the like can be more reliably maintained. Device 2
This is advantageous for connecting the optical fiber 22 on one side.

When the optical terminal box 50 is mounted inside the support structure 65, various optical terminal devices such as a personal computer installed in a house can be connected.
It can correspond to various uses. Moreover, indoors, it is possible to avoid the influence of snowfall, flooding, and the like without any obstacle to traffic.

The box body and its internal configuration may be the first as long as the optical cables or the optical fibers drawn from the optical cable terminals are connected by connectors.
Therefore, the present invention is not limited to the configuration described in the third embodiment, and other configurations can be applied. An optical cable or an optical cord is applied as the optical fiber on the optical terminal device side. Further, in the optical terminal box, it is also possible to connect optical fibers respectively drawn from a plurality of optical terminal devices to one optical cable.

[0025]

As described above, according to the optical wiring system of the first and second aspects, (1) simply connecting the optical fiber on the user side to the optical terminal,
The optical fiber can be easily connected to the optical cable side optical line,
Improved workability of connection (2) Since there is a high degree of freedom in the installation location of the optical terminal, it can be installed where optical fiber connection is easy (3) (2), whether outdoors or indoors It is possible to easily connect the optical fiber on the user side to the optical line on the optical cable side anywhere, and the versatility as an information terminal is improved. (4) (2) The effects of snowfall, freezing, flooding, etc. The optical characteristics of the optical terminal can be maintained by avoiding them. (5) (2) has an excellent effect that it is possible to avoid becoming an obstacle to traffic.

[Brief description of the drawings]

FIG. 1 is a view showing an optical wiring system according to a first embodiment of the present invention, and is an overall view showing an optical terminal box.

FIG. 2 is a front view showing the internal structure of the optical terminal box of FIG.

FIG. 3 is an overall view showing a mode in which the optical terminal box of FIG. 1 is installed in a house.

FIG. 4 is a diagram illustrating an optical wiring system according to a second embodiment of the present invention, and is a front view illustrating an internal configuration of an optical terminal box.

FIG. 5 is a front view showing the operation of the optical terminal box of FIG.

FIG. 6 is a view showing an optical wiring system according to a third embodiment of the present invention, and is an overall view showing an optical terminal box.

FIG. 7 is a front view showing the internal configuration of the optical terminal box of FIG.

FIG. 8 is a view showing an optical wiring system according to a fourth embodiment of the present invention, and is an overall view showing an optical terminal box.

FIG. 9 is a view showing a conventional optical wiring system, and is a front view showing a handhole to which an optical connector is attached.

FIG. 10 is a front sectional view showing the lifting device installed on the lid of the handhole of FIG. 9;

[Explanation of symbols]

3 ... optical cable, 4 ... branch connection box (closure), 5 ...
Optical cable terminal (branch cable), 22 ... optical fiber,
29: Optical terminal (SC type optical connector), 51: Overhead optical cable, 52: Branch connection box (overhead closure), 53: Cable terminal (branch cable), 59: Optical terminal (multi-core optical connector), T: Ground surface .

Claims (2)

[Claims] An optical cable (3) laid underground, and an optical cable terminal (5) set up on the ground directly from the optical cable or via a branch junction box (4).
And an optical terminal (29, 42) that terminates the optical cable terminal so as to be connectable to another optical fiber (22), and that the optical terminal is installed above the ground surface (T). Characteristic optical wiring system. 2. An aerial optical cable (51) and an optical cable terminal (53) pulled down directly between the aerial cable and the ground surface (T) from the aerial optical cable or via a branch connection box (52). ), And an optical terminal (59) that terminates the optical cable terminal so as to be connectable to another optical fiber (22), wherein the optical terminal is installed above the ground surface (T). Optical wiring system.