JP4142984B2 - Optical fiber wiring method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical fiber wiring method.
[0002]
[Prior art]
With the recent development of optical communication technology and the rapid increase in communication demand represented by the Internet, the introduction of optical fiber cables to subscriber systems including general households has begun. Conventionally, the optical line from the station to the subscriber's home is for the subscriber's home wiring from the end of the thick bundle optical fiber cable and the optical fiber cable for wiring or the connection closure formed in the middle ("For drop connection") A form of wiring (also referred to as “service”) to a subscriber's home with a drop cable in which a single core wire is also covered with a covering has been studied. This connection to the drop cable is referred to as “drop connection”. In the connection portion between the optical fiber cables for wiring, the exposed single fiber connection portion is accommodated by a housing called a connection closure.
[0003]
In Japan, an optical fiber cable for trunks is a type in which 8-core optical fiber tapes are assembled, and an optical fiber cable for wiring is a type in which 4-core optical fiber tapes are aggregated. By using such an optical fiber tape, there is an advantage that the optical fiber cable can be made thin and the optical fiber connection can be efficiently performed.
[0004]
The present invention relates to a method of operating a fiber optic cable for wiring, and this fiber optic cable for wiring is usually often wired using a utility pole. It is called “optical fiber cable” (see, for example, Non-Patent Document 1).
[0005]
In addition, since the single fiber of the optical fiber to be wired to each subscriber's home is usually one core, when connecting the drop cable to the subscriber's home and the optical fiber cable for wiring, the optical fiber tape is a single core. It is necessary to convert it to a line. Therefore, the end of the optical fiber tape is directly separated into single-core wires by a tool.
[0006]
FIG. 5 is a view showing a state in which the end of the optical fiber is directly separated into single core wires by a tool.
[0007]
The end of each single-core wire 3 of the tape end single-core separating portion 2 of the optical fiber tape 1 shown in the figure is connected to an optical fiber single-core wire accommodated in a drop cable (not shown) by fusion or mechanical splicing. The
[0008]
However, it is common that the number of single-core wires 3 included in the optical fiber tape 1 and the number of subscriber homes (that is, the wiring demand at the place to be wired) do not match. In the case of such a mismatch, a maximum of 3 cores (in the case of a 4-core tape) of single-core wires 3 that are left unnecessarily are generated. It was.
[0009]
For the optical subscriber line, a wiring form called passive double star (PDS) is adopted in consideration of the economical efficiency of the communication system.
[0010]
FIG. 6 is a configuration diagram of a passive double star.
[0011]
As shown in the figure, since the optical transmission unit 4 on the station side is shared by a plurality of subscriber homes 5, an optical splitter 8 for branching the single-core wire (one core) 6 on the station side into a plurality of single-core wires 7 is provided. It is inserted in the middle of the optical line. The optical splitter 8 distributes the optical signal from the optical transmission unit 4 on the station side to a plurality of optical transmission devices (not shown) on the subscriber house 5 side, and at the same time, an optical signal in the opposite direction, that is, a plurality of subscriber houses. The optical signal from 5 is transmitted to the optical transmission unit 4 of the station. The optical signals from the optical transmission devices on the plurality of subscriber homes 5 side are transmitted with the time adjusted so as not to interfere. When the optical splitter 8 is installed in the station, the terminals of the optical splitter 8 can be used without waste because the operation of the optical splitter 8 can be performed in units of one core by an optical wiring board (not shown) in the station.
[0012]
On the other hand, when the optical splitter 8 is installed outside the station, there is a problem in wiring operation. For this reason, conventionally, only the installation of the optical splitter 8 in the station has been studied. However, recently, since optical cables outside the office can be saved, it has been promoted to install the optical splitter 8 outside the office.
[0013]
At present, a configuration in which a four-branch optical splitter is installed in a station and an eight-branch optical splitter is installed outside the station and connected in series to make a total of 32 branches is becoming mainstream. In this case, when one single-core wire among the single-core wires separated from each other is split into eight cores by an optical splitter, when there is a demand for only one core at the branch destination, the single-core wires are separated. 7 of them will be wasted. In this case, the four-fiber optical fiber tape can be wired to 32 subscriber homes originally, but it is used only in one subscriber home and is left unattended.
[0014]
For this reason, the utilization factor of an optical splitter becomes low and there exists a problem that the cost reduction effect which installs an optical splitter outside a station does not arise.
[0015]
On the other hand, other methods have been studied in order to avoid such a decrease in the core wire utilization efficiency when an optical fiber tape is applied to the optical wiring system.
[0016]
For example, as shown in FIG. 7, not the end of the optical fiber tape 9, but the intermediate coating is locally removed to separate each single fiber 10 and one single fiber 10 is taken out from the separated portion. There is a method in which the single-core terminal is wired to a subscriber's house (for example, see Patent Document 1). Other coating removal methods (hereinafter referred to as “intermediate single core separation”) for such purposes have been studied (see, for example, Patent Document 2 and Patent Document 3). FIG. 7 is an explanatory diagram of an optical fiber tape subjected to intermediate single-core separation.
[0017]
However, the wiring method envisaged for the separation of the intermediate single core of the optical fiber tape 9 branches the optical fiber tape 9 at an arbitrary place as needed so that it can be handled in the same manner as the wiring of the single fiber 10. That is.
[0018]
For this reason, in such an intermediate single fiber separation, an optical fiber tape including an optical fiber in a communication service in which signal light is propagated is also an object, so that non-standard optical loss may not occur during work. I need it. For this reason, it is difficult to reliably carry out the optical fiber wiring, and it is unavoidable that the intermediate single-core separation work is troublesome.
[0019]
Therefore, although there is a prior art that only branches a single core from the middle part of this optical fiber tape, how to branch and how to wire the single core after the branch is actually Not implemented.
[0020]
[Patent Document 1]
Japanese Patent No. 2637411 (2nd page, Fig. 1)
[Patent Document 2]
JP-A-8-5880 (page 10, FIG. 7)
[Patent Document 3]
Japanese Patent Laid-Open No. 10-221545 (page 3-5, FIG. 1)
[Non-Patent Document 1]
Zhou Take et al. “Optical Loss Characteristics of SM Type Overhead Optical Fiber Cable” 2001 IEICE General Conference Proceedings (separate volume: Communication 2), Lecture No. B-10-22, p. 455
[0021]
[Problems to be solved by the invention]
By the way, the conventional wiring method using the optical fiber tape has a problem that the utilization efficiency of the single core wire is extremely lowered. The single-fiber branch wiring method using intermediate single-fiber separation of optical fiber tape, which has been studied to solve the problem of lowering the utilization efficiency, can reliably increase the optical loss when communication light is currently propagated. There was no guarantee that it could be prevented, and there was a problem of anxiety about communication failure.
[0022]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical fiber wiring method that solves the above-described problems, does not cause communication failure due to intermediate single-core separation, and improves the utilization efficiency of the optical fiber cable.
[0023]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention of claim 1 is directed to an optical network that is already wired to a subscriber's home in a plurality of connection closures provided in the middle of a fiber optic cable having a plurality of optical fiber tapes from a station. For optical fiber tapes having a single fiber core, the above intermediate is not applied to an optical fiber tape having only a single fiber unwired to the subscriber's home under the condition that the intermediate single fiber separation is not allowed. Light that performs single-core separation , cuts a single-core wire selected from the single-core wires separated by the above-mentioned intermediate single-core separation, and wires the terminal of the cut single-core wire to a new subscriber's house in fiber wiring method, in performing the wiring to the new subscriber's home, in a connection closure having a terminal surplus single fiber of an optical fiber tape having already prewired single fiber to the subscriber's home, its The terminal of the extra single core wire Connected to the terminal of a single core wire selected and cut out of the single core wires separated by the intermediate single core separation of the optical fiber tape having only unwired single core wires to the customer's home and newly joined Wiring to the person's home.
[0030]
According to the configuration of claim 1 , by using a connection closure having a single core wire in which a terminal is left when wiring to a subscriber's home, there is no communication failure due to intermediate single core separation, and an optical fiber The cable utilization efficiency can be improved.
[0031]
According to a second aspect of the present invention, in addition to the configuration according to the first aspect, a connection closure other than the connection closure having a terminal of an extra single fiber of an optical fiber tape having a single fiber already wired to a subscriber's home when the wiring to the new subscriber's home is needed in the inner, when the optical fiber tape in the other connection closures are not intermediate the single core separation, to the subscriber's home in the other connection closure Select and select an optical fiber tape that has been separated by an intermediate single fiber in a connection closure that has an extra single fiber end of an optical fiber tape that is unwired and has already been wired to a subscriber's home. the optical fiber tape intermediate single-fiber separation in the other connection closures, cutting the single fibers selected among the intermediate single core single fibers separated by the separation, of the cut single fibers Of the terminals, the surplus The terminal closer to the connection closure with a line of the terminal, or connected directly to the single fibers in the optical fiber cable for debiting to the new subscriber's premises, as well as indirect connection via an optical splitter, excess single The single fiber of the optical fiber tape separated from the middle single fiber is cut in the connection closure where the cable ends are located, and the surplus single fiber is connected to the single fiber terminal on the side where wiring to a new subscriber's house is required. May be connected.
[0032]
According to the second aspect of the present invention, there is a single-core intermediate separation section in another connection closure that is not wired to the subscriber's home in the connection closure without a single-core separation section and that has an extra single-core terminal. By selecting an optical fiber tape, separating the optical fiber tape and connecting the single fiber end, there is no communication failure due to the intermediate single fiber separation, and the use efficiency of the optical fiber cable can be improved. .
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0034]
FIG. 1 (a) is an explanatory diagram showing an embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 1 (b) is a new diagram of FIG. 1 (a). It is explanatory drawing after wiring to a subscriber's house. For simplicity of explanation, the optical fiber cable is represented by two optical fiber tapes.
[0035]
As shown in FIG. 1 (a), a plurality of optical fiber cables having optical fiber tapes 20 and 21 from a station (not shown) (two but not limited in FIG. The connection closures 22-A, 22-B-1, 22-B-2, 22-B-3, 22-C are provided. A single cable can be wired from each connection closure 22-A to 22-C to each subscriber's house (not shown) using a covering cable (also referred to as “pulling down”).
[0036]
Since the connection closure 22-A is a connection part of the optical fiber cable, the optical fiber tapes 20 and 21 are connected to each other. Reference numerals 27 and 28 denote connection portions of the optical fiber tapes 20 and 21, respectively. As a method for connecting the optical fiber tapes 20 and 21, multi-fiber fusion connection, MT (Mechanically Transferable) connector, mechanical splice, or the like can be applied.
[0037]
In the connection closure 22-C, one optical fiber tape 20 (the upper side in FIG. 1 (a)) is single-core separated at the terminal (in this case, the right terminal), and one of the single-core terminals 29 is connected to the drop cable 30. It is connected to the single fiber end 31 of the optical fiber inside. A connection portion between the single-core terminal 29 and the single-core terminal 31 is indicated by 32-1. A mechanical splice or fusion splicing can be applied to the connection between the single-core terminals 29 and 31.
[0038]
As described above, the optical fiber cable 20 at the end of the optical fiber cable is excluded from the optical fiber tape 20, and the intermediate single-core separation is performed at the intermediate connection closures 22-B-1 to 22-B-3 of the optical fiber cable. What is implemented is the other optical fiber tape 21 (in this case, the lower side). The intermediate single core separation parts are indicated by 33-1, 33-2 and 33-3, respectively.
[0039]
In the case of the wiring state shown in FIG. 1A, when a drop connection is required in any of the connection closures 22-A to 22-C among the connection closures 22-B to 22-C. Selects and disconnects the single-core wire from the intermediate single-core separation sections 33-1 to 33-3, and connects the single-core terminal on the side close to the station (in this case, the left side) with the single-core terminal of the drop cable do it.
[0040]
FIG. 1B shows a case where drop connection is performed by the drop cables 36 and 37 in the connection closures 22-B-1, 22-B-3. That is, the single core of the drop cable 36 is connected to the single-core terminal 23 closer to the station among the single-core wires cut by the intermediate single-core separating portion 33-1 of the optical fiber tape 21 by the connection closure 22-B-1. The line terminal 39 is connected and dropped to the single-core terminal 40 closer to the station among the cut single-core cables of the intermediate single-core separating part 33-3 of the optical fiber tape 21 by the connection closure 22-B-3. A single-core terminal 41 of the cable 37 is connected. A connection part between the single-core terminal 23 and the single-core terminal 39 is indicated by 32-2, and a connection part between the single-core terminal 40 and the single-core terminal 41 is indicated by 32-3.
[0041]
After carrying out the drop connection with such drop cables 36 and 37, no matter what the demand for the drop connection occurs in the connection closures 22-B-1, 22-B-3, this intermediate single-core separated light About the fiber tape 21, a single core wire is utilized without waste.
[0042]
As described above, at least one of the intermediate single-core separating portions 33-1 to 33-3 is provided in at least one of the connection closures 22-B-1 to 22-B-3 before carrying out the withdrawal operation. Thus, the single cores in the optical fiber tape 21 can be accommodated in units of single cores between these connection closures 22-B-1 to 22-B-3. (For the same optical fiber tape 20 (21), it is not necessary to provide the intermediate single-core separating portions 33-1 to 33-3 in all of the connection closures 22-B-1 to 22-B-3. Good.)
[0043]
In addition, the optical fiber tape 21 separated from the intermediate single core can actually be pulled down by the connection closure 22-C. However, it is preferable that the drop connection at the connection closure 22-C is postponed as much as possible, and priority is given to the drop connection from the optical fiber tape 20 that is not separated by the single core. Also in the connection closure 22-A, it is better to leave an optical fiber tape that is not connected for the withdrawal connection in the connection closure 22-A.
[0044]
By carrying out the pull-out wiring in this way, the single fiber in the optical fiber tape 21 can be accommodated in the unit of single fiber between the connection closures 22-B-1 to 22-B-3. There is no occurrence of communication failure, and the utilization efficiency of the optical fiber cable can be improved.
[0045]
FIG. 2A is an explanatory diagram showing another embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 2B is a new diagram of FIG. It is explanatory drawing after wiring to a new subscriber's house. Hereinafter, the same reference numerals are used for the same members as those in the embodiment shown in FIGS.
[0046]
The difference between the embodiment shown in FIGS. 2 (a) and 2 (b) and the embodiment shown in FIGS. 1 (a) and 1 (b) is that both optical fiber tapes are separated from each other by an intermediate single core. Is a point.
[0047]
As shown in FIG. 2 (a), the single-core terminal 38 closer to the station among the single-core wires cut by the intermediate single-core separating portion 33-4 of the optical fiber tape 21 by the connection closure 22-B-4 is provided. The single-core terminal 25 of the drop cable 24 is connected, and the single-core closer to the station among the single-core wires cut by the intermediate single-core separating portion 33-5 of the optical fiber tape 20 by the connection closure 22-B-6. A single-core terminal 45 of a drop cable 44 is connected to the line terminal 43. A connection part between the single-core terminal 25 and the single-core terminal 38 is indicated by 32-4, and a connection part between the single-core terminal 43 and the single-core terminal 45 is indicated by 32-5.
[0048]
As shown in the figure, the optical fiber tapes 20 and 21 are partially separated by an intermediate single fiber, but if there is another optical fiber tape that is not separated by an intermediate single fiber, such a partially intermediate fiber is separated. A state where a single core is separated is sufficiently assumed.
[0049]
Here, consider the case where demand for drop connection occurs in the connection closure 22-B-5 (or it may be considered that there is demand for drop connection and the connection closure 22-B-5 is attached to the optical fiber cable). .
[0050]
When such a demand for drop connection occurs, the optical fiber tapes 20 and 21 in the connection closure 22-B-5 do not have an intermediate single-fiber separating part, so that it is necessary to newly perform an intermediate single-fiber separation. However, the problem is how to select the optical fiber tape for performing the intermediate single fiber separation. In such a case, it is only necessary to select an optical fiber tape in which all the single-core wires to be accommodated are not wired to the subscriber's house.
[0051]
By selecting an optical fiber tape having an unwired single-core wire for the subscriber's home, there is no possibility of causing a communication failure to the already-wired subscriber's home at the time of intermediate single-core separation. Which single-core wire is not wired to the subscriber's home can be confirmed from the existing database because it can be confirmed by the conventional operation method. FIG. 2B shows a state in which an optical fiber tape having an unwired single core wire is selected at the subscriber's home and the connection is dropped by the connection closure 22-B-5.
[0052]
As shown in FIG. 2 (b), the single-core terminal 47 closer to the station among the single-core wires cut by the intermediate single-core separating portion 33-6 of the optical fiber tape 21 by the connection closure 22-B-5. A single-core terminal 49 of the drop cable 48 is connected to the cable. A connection portion between the single-core terminal 47 and the single-core terminal 49 is indicated by 32-6.
[0053]
Even if such a drop wiring is carried out, the same effects as those of the embodiment shown in FIGS. 1A and 1B can be obtained.
[0054]
FIG. 3A is an explanatory diagram showing another embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 3B is a new diagram of FIG. It is explanatory drawing after wiring to a new subscriber's house.
[0055]
The difference between the embodiment shown in FIGS. 3 (a) and 3 (b) and the embodiment shown in FIGS. 2 (a) and 2 (b) is that an optical splitter is attached to the intermediate single-core separating portion of the connection closure. It is a point that is indirectly connected using.
[0056]
In the connection closure 22-B-8 shown in FIG. 3 (a), the intermediate single-core separating part 33-7 of the optical fiber tape 20 is cut, and the single-core terminal closer to the station among the cut single-core lines. The integrated side terminal 53 of the optical splitter 52 is connected to 51, and one of the branch side terminals 50 of the optical splitter 52 is pulled down and connected to the single core terminal 56 of the drop cable 55. A connection part between the single-core terminal 51 and the integration-side terminal 53 is indicated by 32-7, and a connection part between the branch-side terminal 50 and the single-core terminal 56 is indicated by 32-8.
[0057]
Here, by using the optical splitter 52 to indirectly connect the optical fiber tape 20 and the drop cable 55 to the intermediate single-core separating unit 33-7, the branch side terminal 50 of the optical splitter 52 can be used for another connection closure. Alternatively, the point that the terminal of the surplus single fiber of the previously cut optical fiber tape can be used for another connection closure will be described below.
[0058]
FIG. 3 (b) shows a state in which the connection cables 22 and B-10 and the connection cables 22 and B-10 provided with an intermediate single-fiber separation portion of the same optical fiber tape are connected with the cables 65 and 68, respectively. ing.
[0059]
First, since there is the optical fiber tape 21 having the intermediate single-core separating portion 33-8 in the above-described connection closure 22-B-8, the single-core wire is drawn from the optical fiber tape 21 and cut to obtain the optical fiber tape 21. Of the two single-core terminals, the single-core terminal 57 closer to the station and the single-fiber terminal 58 closer to the station of the optical fiber tape 20 are connected, and the remaining single-core of the optical fiber tape 21 is connected. The line terminal 59 is connected to the other branch side terminal 54 of the optical splitter 52. A connection part between the single-core terminal 57 and the single-core terminal 58 is indicated by 32-9, and a connection part between the branch side terminal 54 and the single-core terminal 59 is indicated by 32-10.
[0060]
Next, the single-core terminal 61 far from the station among the disconnected single-core wires of the intermediate single-core separating unit 33-10 in the connection closure 22-B-7 is connected to the integrated-side terminal 63 of the optical splitter 62. Then, the branch side terminal 64 of the optical splitter 62 and the single core terminal 66 of the drop cable 65 are connected. A connection portion between the single core wire terminal 61 and the integrated side terminal 63 is indicated by 32-11, and a connection portion between the branch side terminal 64 and the single core wire terminal 66 is indicated by 32-12.
[0061]
Furthermore, in the connection closure 22-B-10, the single-core wire of the intermediate single-core separating part 33-9 of the optical fiber tape 21 is pulled out and cut, and the single-core terminal 67 and the drop cable 68 closer to the station are connected. A single-wire terminal 69 is connected. A connection portion between the single-core terminal 67 and the single-core terminal 69 is indicated by 32-13.
[0062]
By wiring in this way, other connection closures can be obtained by using an empty single fiber end of another optical fiber tape or an empty terminal of an optical splitter by using an optical fiber tape provided with a plurality of intermediate single fiber separation parts. Can be used. Moreover, even if such wiring is carried out, the same effect as the embodiment shown in FIGS. 1A and 1B can be obtained.
[0063]
FIG. 4A is an explanatory diagram showing another embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 4B is a new diagram of FIG. It is explanatory drawing after wiring to a new subscriber's house.
[0064]
The difference between the embodiment shown in FIGS. 4 (a) and 4 (b) and the embodiment shown in FIGS. 3 (a) and 3 (b) is that both optical fiber tapes 20 and 21 are separated by an intermediate single fiber. It is a point that has been.
[0065]
The embodiment shown in FIGS. 4A and 4B shows a case where the intermediate single-core separating unit is not provided in the connection closure 22-B-14 in which demand has occurred.
[0066]
In the connection closure 22-B-11 shown in FIG. 4 (a), the single-core terminal 70 and the one near the station, which are pulled out and cut from the intermediate single-core separating section 33-13 of the optical fiber tape 21, are dropped. A single core terminal 82 of the cable 60 is connected.
[0067]
In the connection closure 22-B-12 shown in the figure, the single-core terminal 71 closer to the station among the single-core cables cut after the intermediate single-core separation of the optical fiber tape 20 and the integrated-side terminal of the optical splitter 72 73, and the branch side terminal 74 of the optical splitter 72 and the single core terminal 76 of the drop cable 75 are connected.
[0068]
In the connection closure 22-B-12 shown in FIG. 4 (b), the optical fiber tape is separated by an intermediate single core, and the single core wire terminal 77 far from the station and the other branch side terminal 78 of the optical splitter 72 are connected. Has been.
[0069]
In the connection closure 22-B-14 shown in the figure, the single fiber core of the optical fiber tape 21 is separated, and the single fiber terminal 79 closer to the station and the single fiber terminal 81 of the drop cable 80 are connected. .
[0070]
In such a case, as in the embodiment shown in FIGS. 2 (a) and 2 (b), all the optical fiber tapes 20 and 21 to be accommodated need only select an optical fiber tape that is not wired to the subscriber's home. . When the optical fiber tape is selected in this way and the single-core terminal 79 closer to the station is connected to the single-core terminal 81 of the drop cable 80 by the connection closure 22-B-14, the connection shown in FIG. The connection state is the same as that shown in the closure 22-B-5.
[0071]
In the above, according to the present invention, it is possible to operate a single fiber optical fiber cable of the optical fiber tape assembly type without taking the risk of causing a communication failure due to intermediate single fiber separation. The utilization efficiency of the fiber cable can be improved, and it can contribute to the cost reduction of the optical broadband service.
[0072]
【The invention's effect】
In short, according to the present invention, it is possible to provide an optical fiber wiring method that does not cause communication failure due to intermediate single-core separation and improves the utilization efficiency of the optical fiber cable.
[Brief description of the drawings]
FIG. 1 (a) is an explanatory diagram showing an embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 1 (b) is a diagram of FIG. It is explanatory drawing after the wiring to a new subscriber's house.
FIG. 2 (a) is an explanatory diagram showing another embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 2 (b) is a diagram of FIG. It is explanatory drawing after wiring to the new subscriber's house of a).
FIG. 3 (a) is an explanatory diagram showing another embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 3 (b) is a diagram of FIG. It is explanatory drawing after wiring to the new subscriber's house of a).
FIG. 4 (a) is an explanatory view showing another embodiment of the optical fiber wiring method of the present invention before wiring to a new subscriber's house, and FIG. 4 (b) is a diagram of FIG. It is explanatory drawing after wiring to the new subscriber's house of a).
FIG. 5 is a view showing a state in which the end of an optical fiber is directly separated into single-core wires by a tool.
FIG. 6 is a configuration diagram of a passive double star.
FIG. 7 is an explanatory diagram of an optical fiber tape subjected to intermediate single-core separation.
[Explanation of symbols]
20, 21 Optical fiber tape 22-A, 22-B-1 to 22-B-14, 22-C Connection closure 23, 29, 31, 40 Single-core terminal 30, 36, 37 Drop cable 32-1 to 32 -13 Connection unit 33-1 to 33-14 Intermediate single-core separation unit

Claims (2)

Single fiber for an optical fiber tape having a single optical fiber already wired to a subscriber's home in a plurality of connection closures provided in the middle of the optical fiber cable having a plurality of optical fiber tapes from the office The optical fiber tape having only the single optical fiber that is not wired to the subscriber's home is subjected to the intermediate optical fiber separation under the condition that the intermediate optical fiber separation is not permitted. In the optical fiber wiring method of cutting a selected single core wire among the single core wires and wiring the terminal of the disconnected single core wire to a new subscriber's house,
When wiring to a new subscriber's home, in the connection closure having the terminal of the extra single fiber of the optical fiber tape having the single core already wired to the subscriber's home, Connect the terminal to a single-fiber terminal that has been selected and cut out of the single-core wires separated by intermediate single-fiber separation of optical fiber tape that has only unwired single-core wires to the subscriber's home. An optical fiber wiring method characterized by wiring to a subscriber home. When it becomes necessary to interconnect to the new subscriber's home in other connections closure other than the connection closure having a terminal of the optical fiber ribbon of the surplus single fiber having already prewired single fiber to the subscriber's home , when the optical fiber tape in the other connection closures are not intermediate the single core separation, the other is unwired to subscriber homes in the connection a closure, and the single fiber already already wired to the subscriber's home select an intermediate single core separated optical fiber ribbon in connection closure having a terminal of the optical fiber ribbon of the surplus single fiber having, an intermediate single-core separates the selected optical fiber tapes in the other connection closure The selected single-core wire is disconnected from the single-core wires separated by the intermediate single-core separation, and the one of the disconnected single-core wires is closer to the connection closure where the extra single-core wires are located. the terminal Connect directly to a single fiber in an optical fiber cable for withdrawal to a new subscriber's home, or connect indirectly via an optical splitter, and separate the single fiber in a connection closure with an extra single fiber terminal The optical fiber wiring according to claim 1, wherein the single fiber of the optical fiber tape is cut, and the terminal of the surplus single fiber is connected to the terminal of the single fiber on the side where wiring to a new subscriber's house is required. Method.

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