JP5352393B2 - Optical wiring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical wiring method, capable of effectively responding to increase in the number of subscribers, and moreover, suppressing the cost and facilitating the operation. <P>SOLUTION: The optical wiring method for distributing an optical fiber from an optical wiring network 1 to a user house 2 includes a first step of aerially setting a wiring pipe 4, extending from a lead-in position 3 to the user house 2 to the optical wiring network 1, and distributing an optical fiber cable 10 from the lead-in position 3 to the optical wiring network 1 through the wiring pipe 4; and a second step of constructing optical wiring from the optical fiber cable 10 at the lead-in position 3 up to the user house 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to an optical wiring how to perform debiting optical line to the user (subscriber) premises in the optical wiring network.

For example, Patent Documents 1 to 5 disclose techniques relating to the dropping of an optical line to a user's house in an optical wiring network.
Patent Document 1 discloses a wiring system that uses an aggregate cable in which a plurality of single-core element cables are aggregated, and branches and connects the element cable to the drop cable at the withdrawal location.
Patent Document 2 discloses an optical cable connecting pipe used for a branching / connecting portion of an optical cable.
In Patent Document 3, the drop cable bundled in a ring shape is passed through the other end side of the wire body having one end fixed in the vicinity of the drop point of the overhead wiring network, and this drop cable is fed out toward the drop point. A method for wiring a drop cable is disclosed.
Patent Document 4 discloses an optical fiber cable having a mold part for pulling down. An external drop cable is branched and connected to the optical fiber cable at the mold portion.
Patent Document 5 discloses a technique for branching by pulling out a drop cable from an optical cable formed by gathering drop cables with connectors attached in advance around a central support line.

JP 2008-224990 A Japanese Patent No. 3564702 JP 2002-142319 A JP 2008-129169 A JP 2001-215375 A

In the technique described in Patent Document 1, it is necessary to predict the increase in the number of subscribers and to prepare the number of element cables corresponding to the increase. However, if the number of subscribers is not predicted, some elements are required. The cable was left unused and there was a problem in terms of cost control. In addition, the element cable in the portion beyond the withdrawal location is not used, and this also causes a cost disadvantage.
Even in the technique described in Patent Document 2, it is difficult to cope with an increase in the number of subscribers while suppressing costs.
In the technique described in Patent Document 3, since the drop cable is laid in a spiral shape, the length is required as compared with the straight wiring, and improvement is required in terms of cost. In addition, after fixing the striated wire near the withdrawal point, it is necessary to pass a drop cable through it and extend it to the withdrawal point, so it is necessary to work at a high altitude at least twice, and laying work is easy. I couldn't.
Even in the technique described in Patent Document 4, it is difficult to cope with an increase in the number of subscribers while suppressing costs.
The technique described in Patent Document 5 also has a problem in terms of cost reduction, as in the technique described in Patent Document 1.
The present invention has been made in view of the above circumstances, lower costs, and effectively can accommodate the increased number of subscribers, yet has an object to provide an optical wiring how made it easy work.

The present invention relates to an optical wiring method for wiring an optical fiber from an optical wiring network to a user's house, wherein a wiring pipe extending from the dropping position to the user's house to the optical wiring network is installed overhead, and the wiring pipe is installed in the wiring pipe. A first step of wiring the first optical fiber cable from the withdrawal position to the optical wiring network, and a second step of constructing an optical wiring from the first optical fiber cable at the withdrawal position to the user's house. seen including, in the second step, the other end of the second optical fiber cable having one end leading to the user's home, by connecting to the first optical fiber cable in the withdrawal position, the user from the withdrawal position An optical wiring method for constructing an optical wiring to a home is provided.
The raceway, the outer periphery of the inner tube that can be wired to the first optical fiber cable therein, external coating covering the entire circumference of the inner tube is formed, the inside tube, the first optical fiber cable It is preferable that a slit capable of drawing out is formed along the longitudinal direction.
The wiring pipe is preferably provided with a housing case that covers a portion where the optical wiring is pulled down at the dropping position.
The connection of the second optical fiber cable to the first optical fiber cable is preferably a connector connection.

The optical wiring system of the present invention is an optical wiring system for wiring an optical fiber from an optical wiring network to a user's house, and a wiring pipe extending from the drawing position to the user's house to the optical wiring network is installed overhead. An optical wiring system in which an optical fiber cable is routed from the dropping position to the optical wiring network in this conduit, and an optical wiring from the optical fiber cable at the dropping position to the user's house is constructed.

According to the present invention, since the optical wiring from the dropping position to the optical wiring network is constructed by the first process (preliminary work), the second process (opening work) which is the final stage is short from the dropping position to the user's house. It is only necessary to construct a distance optical wiring.
In the second process (opening work), the user's consent is required and there are many restrictions. However, in the present invention, the wiring is compared to the case where the optical wiring is constructed all at once from the optical wiring network to the user's house. Since the required distance is short, the work becomes easy.
Corresponding to the increase in subscribers (users), the range of the optical fiber cable from the drawing position close to the user's home to the optical wiring network, that is, the range required for the construction of the optical wiring to the user's home Since it can be provided only in the case, no waste occurs, which is advantageous in terms of cost.
Therefore, it is possible to reduce costs and effectively cope with an increase in the number of subscribers.

It is a schematic diagram which shows the 1st example of the optical wiring system of this invention. It is the schematic diagram which expanded the principal part of the optical wiring system. It is a front view which shows the wiring pipe of an optical wiring system. It is a perspective view which shows the internal structure of a storage case. It is sectional drawing which shows an example of an optical fiber cable. It is sectional drawing which shows the other example of an optical fiber cable. It is a front view which shows an example of an optical connector. It is a schematic diagram which shows the 2nd example of the optical wiring system of this invention. It is a schematic diagram which shows the 3rd example of the optical wiring system of this invention. It is a schematic diagram which shows the 4th example of the optical wiring system of this invention.

Hereinafter, a first example of the optical wiring system of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a first example of an optical wiring system of the present invention. FIG. 2 is an enlarged view of a main part of the optical wiring system. FIG. 3 is a front view showing a conduit of the optical wiring system. FIG. 4 is a perspective view showing the internal structure of the housing case. FIG. 5 is a cross-sectional view showing an example of the optical fiber cable 10. FIG. 6 is a cross-sectional view showing another example of the optical fiber cable 10. FIG. 7 is a front view showing an example of an optical connector that can be employed in the optical fiber cable 10 and the drop cable 16.

The optical wiring system shown in FIG. 1 is a system for wiring an optical fiber from the optical wiring network 1 (station side optical fiber cable) to the user's home 2.
In this optical wiring system, a wiring pipe 4 extending from a withdrawal position 3 to a user's home 2 to the optical wiring network 1 is installed overhead.
The withdrawal position 3 is close to the user's home 2 and is a position where the drop cable 16 can be easily wired.

  The optical wiring network 1 is connected to an optical branching unit 7 in an aerial-installed closure 6, and the branch side optical fiber 8 of the optical branching unit 7 is terminated by an optical connector 8a.

As shown in FIGS. 1 to 3, the wiring tube 4 can be configured such that an outer coating 12 that covers the entire periphery of the inner tube 11 is formed on the outer periphery of the inner tube 11.
As shown in FIG. 3, the internal tube 11 has an internal space in which one or a plurality of optical fiber cables 10 can be wired.
The inner tube 11 is formed with a slit 11a extending in the length direction through which the optical fiber cable 10 can be pulled out. The inner tube 11 may have a C-shaped cross section, for example. The width of the slit 11a is determined so that the optical fiber cable 10 can be pulled out.
The outer coating 12 may be a coating made of resin or the like.

The outer pipe 12 is removed over a predetermined length of the wiring pipe 4 in the illustrated example, whereby the inner pipe body 11 is exposed, and the optical fiber cable 10 is drawn out through the slit 11a in the exposed portion.
The slit 11a in this portion serves as a drawer port 11b from which the optical fiber cable 10 is pulled out. The lead-out port 11b is a part where the optical fiber cable 10 is pulled out, and thus the part where the optical wiring is pulled down.

As shown in FIG. 1, the optical fiber cable 10 is wired in the conduit 4 in the range from the drop position 3 to the closure 6.
When there are a plurality of drop positions 3, the optical fiber cable 10 is wired to at least the drop position 3 farthest from the closure 6.
In the example shown in FIGS. 1 and 2, there are two drop positions 3A and 3B having different distances from the closure 6, and two optical fiber cables 10A and 10B reaching the drop positions 3A and 3B are used.
In this example, a plurality of optical fiber cables 10 reaching the respective drop positions 3A and 3B are used. However, when a multi-core optical fiber cable 10 is used, the optical fiber cable 10 is connected to the second drop position 3B. And the optical fiber cable 10 may be branched at the first withdrawal position 3A, and the branch wiring may be withdrawn.

As the optical fiber cable 10, for example, the one shown in FIG. 5 or 6 can be adopted.
The optical fiber cable 10 in the example shown in FIG. 5 has a self-supporting structure in which a support line portion 21 and a cable main body portion 22 are connected via a neck portion 23.
The cable main body 22 is obtained by collectively coating an optical fiber 24 and strength members 25 arranged on both sides thereof with a coating resin 26.
The optical fiber 24 may be a single-core optical fiber core, a multi-core optical fiber ribbon, or the like. The number of optical fibers 24 may be one or plural.
The tensile body 25 is a linear body vertically attached along the optical fiber 24, and a metal wire such as a steel wire can be used.
The support wire portion 21 is obtained by coating a tensile body 28 with a coating resin 29. The tensile body 28 is preferably a metal wire such as a steel wire. The coating resin 29 can be made of the same material as the coating resin 26.
The neck portion 23 can be made of the same resin as the coating resins 26 and 29 and can be formed integrally with the coating resins 26 and 29.
The optical fiber cable 10 shown in FIG. 6 has the same configuration as that of the optical fiber cable 10 shown in FIG.
The optical fiber cable 10 having the structure shown in FIGS. 5 and 6 can also be used as the drop cable 16.

  As shown in FIG. 1, one end of the optical fiber cable 10 is introduced into the closure 6. The optical fiber cable 10 is connected to the optical wiring network 1 via the optical branching device 7 by connecting an optical connector 10a provided at one end to the optical connector 8a.

As shown in FIGS. 2 and 4, a housing case 13 is installed in the conduit 4 at the withdrawal position 3.
The housing case 13 is formed so as to cover the portion of the wiring tube 4 including the outlet 11b.
As shown in FIG. 4, the housing case 13 in the illustrated example is a substantially trapezoidal case body in which insertion ports 13 a and 13 b through which the wiring tube 4 is inserted are formed at one end and the other end, respectively.
Each of the storage cases 13 includes a tray-like first case half 14A and a second case half 14B, and can be assembled by connecting them facing each other.

The first case half 14A is provided with an optical connector 15 (optical connector adapter) into which an optical connector 10b (optical connector plug) provided at the other end of the optical fiber cable 10 drawn from the wiring tube 4 is inserted. ing.
In the optical connector adapter 15, the optical connector plug 10b is inserted into one opening. In the optical connector adapter 15, the optical connector plug 10b and the optical connector plug 16a are connected to each other by inserting an optical connector 16a (optical connector plug) provided at the end of the drop cable 16 into the other opening. .

In the illustrated example, the optical connector adapter 15 is provided so that the optical axis directions of the optical connectors 10 b and 16 a are substantially parallel to the optical fiber cable 10, and the drop cable 16 is disposed in the housing case 13. Are arranged almost in parallel.
As the optical connectors 8a, 10a, 10b, 15, 16a, for example, an SC type optical connector (F04 type optical connector established in JIS C 5973, SC: Single fiber Coupling optical fiber connector) can be adopted.

FIG. 7 shows an example of an optical connector plug that can be employed as the optical connector plugs 10b and 16a.
The configuration of this optical connector plug will be described using the optical connector plug 10b provided at the end of the optical fiber cable 10 as an example.
The optical connector plug 10 b is an on-site assembly type optical connector, and includes a connector main body 30 and a retaining mechanism 40 that holds the optical fiber cable 10 to the connector main body 30.
The connector body 30 includes a ferrule 33 with a connection mechanism, a housing 34 that accommodates the ferrule 33 with a connection mechanism, an urging means 35 provided in the housing 34, and a knob 37 that can be attached to the outside of the housing 34. ing.
The housing 34 is formed in a sleeve shape that accommodates the ferrule 33 with a connection mechanism.
The ferrule 33 with a connection mechanism includes an optical ferrule 31 (hereinafter simply referred to as a ferrule 31) and a connection mechanism 32 provided on the rear end side of the ferrule 31.

An optical fiber introduction hole (fine hole) (not shown) is formed in the ferrule 31, and a built-in optical fiber 36 (such as a bare optical fiber) is inserted and fixed in the optical fiber introduction hole. The front end of the built-in optical fiber 36 is exposed at the front end surface 31 a of the ferrule 1, and the rear end protrudes from the rear end of the ferrule 31 and is inserted into the connection mechanism 32.
The connection mechanism 32 butt-connects the rear end portion of the built-in optical fiber 36 to the front end of the optical fiber 17 drawn from the optical fiber cable 10. Reference numeral C <b> 1 is a connection point between the optical fibers 36 and 17.
As the connector body 30, for example, an SC type optical connector can be used.
The retaining mechanism 40 includes a gripping member 41 that grips the jacket 10 c of the optical fiber cable 10 and a retaining means 42 that holds the gripping member 41.

Reference numeral 18 shown in FIGS. 1 and 2 is a spiral hanger as an overhead wire hanger.
The wiring pipe 4 is supported by the spiral hanger 18 along the support line 19 by being passed through the support hanger 18 together with the support line 19, and thus installed overhead.

As shown in FIGS. 1 and 2, the drop cable 16 constitutes an optical wiring from the withdrawal position 3 to the user's home 2.
One end of the drop cable 16 is connected to the indoor wiring 2 a of the user's home 2.
As described above, the optical connector 16 a is provided at the other end of the drop cable 16, and the optical connector 16 a is connected to the optical connector 10 a in the housing case 13.
In FIG. 2, reference numeral 21 denotes a support line portion of the drop cable 16.

Next, an example of the optical wiring method of the present invention will be described by taking the case of constructing the optical wiring system as an example.
When it becomes necessary to newly wire an optical fiber from the optical wiring network 1 to the user's home 2 due to an increase in subscribers (users), the optical line is connected to the user's home 2 according to the following procedure. Can be withdrawn.

(1) Prior construction As shown in FIG. 1 and FIG. 2, the wiring pipe 4 extending from the withdrawal position 3 to the closure 6 is installed overhead.
Next, the optical fiber cable 10 is wired in the conduit 4. The optical fiber cable 10 is preferably inserted toward the closure 6 from the outlet 11b.
Since the optical fiber cable 10 is inserted through the wiring tube 4 and supported by the wiring tube 4, unlike the case where it is directly supported by the spiral hanger, the optical fiber cable 10 does not fall off.
Further, since the optical fiber cable 10 is protected by the wiring pipe 4, even when another thicker optical fiber cable (not shown) is installed in the same route, the optical fiber cable 10 causes pressure or damage to the optical fiber cable 10. I will not receive it.

By connecting the optical connector 10a of the optical fiber cable 10 reaching the closure 6 to the optical connector 8a, the optical fiber cable 10 is connected to the optical wiring network 1 via the optical branching device 7.
Further, as shown in FIG. 4, the optical connector 10 b on the other end side of the optical fiber cable 10 is connected to the optical connector adapter 15 in the housing case 13.

The installation of the conduit 4 and the introduction of the optical fiber cable 10 into the conduit 4 do not require the user's consent and can be performed prior to the opening work, which is the final stage. Process).
Prior construction does not require user consent, so it is easy to adjust work schedules and time zones, and the work can be performed efficiently.

(2) Opening work The other end of the drop cable 16 whose one end is connected to the indoor wiring 2a of the user's home 2 is introduced into the housing case 13, and the optical connector 16a is connected to the optical connector 10b via the optical connector adapter 15. To do. Thereby, the optical wiring from the withdrawal position 3 to the user's home 2 is constructed, and the optical line opening construction (second step) is completed.
This opening work is performed as a final stage work because the drop cable 16 is connected to the user's home 2. The opening work is time-constrained because it requires user consent.

According to the above optical wiring method, since the optical wiring from the dropping position 3 to the closure 6 is constructed by prior construction, only the short-distance optical wiring from the dropping position 3 to the user's house 2 is used in the opening work as the final stage. Build it.
There are many restrictions because the user's consent is required for the opening work, but the above optical wiring method requires wiring as compared to the case where optical wiring is constructed all at once from the closure 6 to the user's home 2. Since the distance is short, the work becomes easy.

Corresponding to the increase in subscribers (users), the optical fiber cable 10 is used to construct an optical wiring to the range from the withdrawal position 3 close to the user home 2 to the closure 6, that is, to the user home 2. Since it can be provided only in a necessary range, no waste occurs, which is advantageous in terms of cost.
Therefore, it is possible to reduce costs and effectively cope with an increase in the number of subscribers.

As shown in FIG. 4, in the optical wiring system of the first example, the connector connection is adopted for the connection between the optical fiber cable 10 and the drop cable 16, but the connection method of the cables 10 and 16 is not limited to this. A butt connection by mechanical splice can also be employed.
FIG. 8 shows a second example of the optical wiring system of the present invention. In this example, a mechanical splice 55 is provided in the housing case 53.
The mechanical splice 55 includes a pair of connection elements 56, 56, a clamp spring (not shown) provided on the outside thereof, and a holder 57 for holding them, and an optical fiber is provided on the inner surface of the connection elements 56, 56. The optical fiber drawn from the cable 10 and the optical fiber drawn from the drop cable 16 can be butt-connected.
These optical fibers are sandwiched between the connection elements 56 and 56 by the elastic force of the clamp spring, and the connection state is maintained.

In order to drop the optical line to the user's house 2 using the optical wiring system of this example, first, in the preliminary construction, the wiring pipe 4 is installed overhead according to the above-described procedure, and the optical fiber cable 10 is wired in the wiring pipe 4. To do.
Next, in the opening work, the optical fiber drawn from the optical fiber cable 10 and the optical fiber drawn from the drop cable 16 are butt-connected in the mechanical splice 55, so that the optical wiring from the dropping position 3 to the user's house 2 is connected. Is built.
Also in this method, the cost can be reduced and the increase in the number of subscribers can be effectively coped with, and the operation becomes easy.

FIG. 9 shows a third example of the optical wiring system of the present invention. In this example, the optical fiber cable 10 drawn from the conduit 4 is directly wired to the user's home 2.
In this example, since there is no connection portion between the optical fiber cable 10 and the drop cable, the operation is further facilitated. Further, the housing case 63 can be reduced in size, which is advantageous in terms of space saving.

FIG. 10 shows a fourth example of the optical wiring system of the present invention. In this example, the optical fiber cable 10 and the drop cable 16 are connected via the optical connector adapter 15 in the same manner as in the example shown in FIG. However, the optical connector adapter 15 is provided so that the optical axis directions of the optical connectors 10 b and 16 a are substantially perpendicular to the optical fiber cable 10.
For this reason, the drop cable 16 is disposed substantially perpendicular to the optical fiber cable 10 in the housing case 73.

  DESCRIPTION OF SYMBOLS 1 ... Optical wiring network, 2 ... User's house, 3 ... Drop-off position, 4 ... Wiring pipe, 10 ... Optical fiber cable, 10b ... Optical connector (optical connector plug), DESCRIPTION OF SYMBOLS 11 ... Internal tube, 11a ... Slit, 11b ... Drawer port, 15 ... Optical connector (optical connector adapter), 16 ... Drop cable, 16a ... Optical connector (optical connector plug) ).

Claims (4)

An optical wiring method for wiring an optical fiber from an optical wiring network to a user's house,
A first step of aerially installing a conduit extending from the dropping position to the user's home to the optical wiring network, and wiring the first optical fiber cable from the dropping position to the optical wiring network in the wiring tube;
Look including a second step for constructing a optical wiring leading to the user's home from the first optical fiber cable of the withdrawal position,
In the second step, by connecting the other end of the second optical fiber cable, one end of which reaches the user's house, to the first optical fiber cable at the withdrawal position, An optical wiring method comprising constructing an optical wiring. In the outer periphery of the inner tube body in which the first optical fiber cable can be routed, an outer coating that covers the entire circumference of the inner tube body is formed in the wiring pipe,
Wherein the inner tube, the optical wiring method according to claim 1, wherein the first optical fiber capable slit pull the cable is characterized in that it is formed along the longitudinal direction. The conduit, optical wiring method according to claim 1 or 2, characterized in that installing a housing case for covering a portion where the optical wiring is debited at the withdrawal position. The optical wiring method according to any one of claims 1 to 3 , wherein the connection of the second optical fiber cable to the first optical fiber cable is a connector connection.

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