JP2000009944A - Optical wiring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily interpose an optical coupler at a low cost in mid-way of optical wires between plural optical wiring boards and a transmission device by connecting the optical wiring boards and the transmission device to each other by means of optical cables for branching interposed with the optical coupler in mid-way without increasing number of parts and connecting points. SOLUTION: The optical fibers 9 connected to the outer line wire optical cables 13 led into a station 20 are branched and connected to the optical cables 24 for branching and multiple optical cables 5 via the optical wiring boards 23. The optical cables 24 for branching have base end cable parts 24b switchably connected to the plural optical connectors 24a of the transmission device 1 and 8 pieces of branch cord parts 24e branched via a coupler housing part 24d housing the 1:8 optical coupler. The respective branch cord parts 24e are connector-connected switchably with the optical fibers 9 drawn out of the terminals of the optical cables 8 or jumper cords 21 within the optical wiring boards 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical distribution system and a branch optical cable.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing a conventional optical wiring system, showing optical wiring in a station. In FIG. 6, in this optical distribution system, a plurality of external optical cables 50 are branched and connected to optical cables 53 on the transmission device 52 side via optical distribution boards 51. In the optical distribution board 51, an optical fiber drawn from the external optical cable 50 and an optical fiber drawn from the transmission-side optical cable 53 are switchably connected via an optical connector or the like. In addition, for example, between the optical fiber of the external line optical cable 50 and the optical fiber of the transmission device side optical cable 53, for example, JI
SC type optical connector (Sing
Leaf Coupling Optical fiber connector), etc., which has a tip that is terminated by an optical connector and has a so-called jumper cord with excellent switching connection workability, to speed up the switching connection work between both optical fibers There is also. In this optical distribution system, the number of cores of the external optical cable 50 and that of the transmission device side optical cable 53 are the same, and the optical fiber of the external line optical cable 50 and the optical fiber of the transmission device side optical cable 53 are connected one-to-one. .

[0003]

By the way, a plurality of lines (optical fibers) on the side of the external optical cable 50 are used to transmit the transmission device 5.
To be able to share the same line (optical fiber) on two sides (change to the so-called PDS method. PDS: Passive)
Double Star), with an optical coupler in the middle of the optical line,
A plurality of optical transmission lines on the external optical cable 50 side are branched and connected to the optical fiber on the transmission device 52 side. Optical distribution board 5
For example, providing an optical coupler in the middle of an optical line between the external optical cable 50 and the optical fiber on the side of the transmission device 52 within the optical line 1 can be achieved by, for example, connecting a dedicated unit containing optical components such as an optical coupler to an optical wiring. It can be implemented by mounting it in the panel 51 and taking measures such as connecting optical fibers from both sides of the external optical cable 50 and the transmission device 52 through this unit. However, in order to allow the same line on the transmission device 52 side to be shared by a plurality of lines distributed over a plurality of different external optical cables 50, there is no appropriate means so far, and this can be performed simply at low cost. The development of feasible technology was required. For example, the optical distribution board 51 and the transmission device 5
2, a dedicated optical distribution board for connecting an optical coupler is installed, and an optical coupler is interposed in the optical line between the optical distribution board 51 and the transmission device 52. It is conceivable that a plurality of lines on the optical distribution board 51 side (external optical cable 50 side) are branched and connected to the same line on the transmission device 52 side via a coupler. However, in this case, the number of parts is reduced by installing a new optical distribution board. Increase in cost due to the increase in
The number of connection points for connecting each optical fiber on the transmission side and on the transmission device 52 side to the optical coupler must be increased. An increase in the number of connection points causes a decrease in connection work efficiency and an increase in connection loss. In addition, installation of a new optical distribution board becomes impossible due to the floor area in a station where the optical distribution board 51 and the transmission device 52 are installed, or the optical distribution board and the transmission device 52 are connected to a plurality of floors. In addition, there is a problem in that the optical fiber cable 53 (intra-office optical cable) is required.

The present invention has been made in view of the above-mentioned problems, and an optical coupler is provided in the middle of an optical line between a plurality of optical distribution boards and a transmission device without increasing the number of components and connection points. It is an object of the present invention to provide an optical wiring system and a branching optical cable that can be easily interposed at low cost.

[0005]

According to the first aspect of the present invention, a plurality of cable-side optical fibers on the side of an external optical cable are connected via a plurality of optical distribution boards provided individually for the plurality of external optical cables. An optical wiring system branch-connected to an optical line on a transmission device side, wherein the optical line on the transmission device side comprises a base cable portion connected to the transmission device via a connector, and an optical coupler comprising the base cable portion. And a plurality of branch cord portions branched via a coupler housing portion that houses the branch cord portion, and the branch cord portions are drawn into a plurality of the optical distribution boards, respectively,
By connecting a connector to the cable-side optical fiber or an optical fiber connected to the cable-side optical fiber, a plurality of cable-side optical fibers related to a plurality of the external optical cables are connected via the branching optical cable. An optical cable connected to a transmission device, and between the optical distribution frame and the transmission device, both ends of which are connectable by an optical connector, and a branch by an optical coupler is not interposed in the middle; and An optical wiring system characterized in that it can be replaced with a branch optical cable is a means for solving the problem. According to the invention described in claim 2, wiring is provided between the transmission device and the plurality of optical distribution boards,
A branch optical cable for branching and connecting a plurality of optical fibers on each optical distribution board side to the transmission device, a base end cable portion having a distal end terminated by an optical connector and connected to the transmission device by a connector, From the base cable section, the optical fiber is branched via a coupler housing section housing an optical coupler, and the ends terminated by an optical connector are drawn into one of the selected optical distribution boards, and the optical fiber and A branch optical cable, comprising: a plurality of branch cord portions connected to a connector, is provided as a means for solving the above problem.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical wiring system and a branch optical cable according to one embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an optical wiring diagram showing intra-office optical wiring which is an optical wiring system of the present embodiment, FIG. 2 is a plan view showing a branching optical cable 24 of the present embodiment, and FIG. It is a figure which shows the cross-section of the cable part 24a, (a) is sectional drawing which shows a thing with a flat cross section,
4B is a cross-sectional view showing a circular cross-section, FIG. 4 is a front view showing the optical distribution board 23, and FIG. 5 is an optical wiring diagram of an optical transmission system near the optical distribution board 23.

As shown in FIG. 1, in this optical distribution system, an optical fiber 9 connected to a plurality of multicore external optical cables 13 drawn into a station 20 is connected to each external optical cable in the station 20. 13, are branched and connected to a branch optical cable 24 and a multi-core optical cable 5, which are optical lines on the transmission device 1 side, via optical distribution boards 23 that are individually provided corresponding to 13. In FIG. 1, an optical fiber pulled out from the external optical cable 13 at a fusion splicer 11 adjacent to the optical distribution board 23,
Optical fiber 9 of optical cable 8 (cable with connector)
And the end of the optical fiber 9 terminated by the optical connector 10 is drawn into the optical distribution board 23.
If the external optical cable 13 itself is a cable with a connector, the optical fiber terminated by the optical connector of the external optical cable 13 so as to be connectable to the connector is directly drawn into the optical distribution board 23, and the fusion splicer 11 and the optical cable 8 are connected.
Is unnecessary. In this case, the optical fiber pulled out from the terminal of the external optical cable 13 and drawn into the optical distribution board 23 functions as a cable-side optical fiber. The optical cable 8 is an intra-office optical cable laid in the office. The optical cable 8 and the optical fiber 9 function as a cable-side optical fiber in the optical distribution board 23.

As shown in FIGS. 1 and 2, the branch optical cable 24 is a single-core cord cable which is switchably connected to a plurality of optical connectors 1a of the transmission apparatus 1 by an optical connector 24a. From the base end cable portion 24b and the base end cable portion 24b:
And a plurality of (eight in FIG. 1 and FIG. 2) single-core branch cord portions 24e branched via a coupler housing portion 24d housing the eight optical couplers 24c.
e, the tip terminated by the optical connector 24f is drawn into an arbitrary one selected from the plurality of optical distribution boards 23,
Inside, the connector is switchably connected to the optical fiber 9 pulled out from the terminal of the optical cable 8 or the jumper cord 21 which is a switching optical cord provided in the optical distribution board 23. The optical distribution board 23 to which the branch cord portion 24e is drawn in is appropriately selected. As shown in FIG. 1, it is possible to disperse and pull in the plurality of optical wiring boards 23. It is also possible to draw all eight wires into one optical distribution board 23.

Optical connector 2 at the distal end of base cable section 24b
4a, the optical connector 24f at the tip of the branch cord portion 24e is a so-called FC defined in JIS C 5973.
Fiber transmission system optical Co
nnector), a so-called SC type optical connector (Single fiber Coupling optical) defined in JIS C 5973.
fiber connector), a so-called MU-type optical connector (Miniature-Unit couplin) established by JIS C5983
g optical fiber connector) can be adopted. The branching optical cable of the present invention is not limited to the branching optical cable 24 shown in FIGS. 1 and 2. For example, a base end cable portion, a branch cord portion, and a distal end thereof can be connected to a connector. The number of optical connectors to be terminated, the number of corresponding optical couplers and the number of branches, the number of branch cords, and the like can be appropriately selected. When a multi-core base end cable portion and a branch cord portion are employed, a multi-core optical connector is employed as an optical connector whose distal end is connectable to a connector.

Each branch cord section 24e has a length of several meters, and is arranged along the floor or below the floor in the station 20.
Wired to the target optical distribution board 23. This branch code part 2
Since 4e has high flexibility like a general optical cord, it can be freely wired in the office 20 and the optical distribution board 23. It is general that the length of all the branch code portions 24e is constant, but it is also possible to make the length of some or all of them different. The desired optical distribution board 23
The extra length of the branch cord portion 24e drawn into the optical distribution board 2
3 is generally secured, but it is also possible to store it under the floor of the station 20 or the like in view of the workability of the switching connection between the optical distribution boards 23. Further, the storage location of the coupler storage section 24d may be above or below the floor of the station 20, or may be inside the optical distribution board 23. Coupler storage 2
When the 4d is stored in the optical distribution board 23, the branch cord portion 24e can be efficiently wired as a cross wiring between the optical distribution boards 23 or the like.

On the other hand, the base end cable portion 24b has
Therefore, a length of up to about 80 m is ensured, so that even if the target optical distribution board 23 is separated from the transmission apparatus 1, the two can be connected. This base end cable part 24b
As an example, the one shown in FIG. 3A accommodates a tension member 24h in the center of a flat outer skin 24g, and has a diameter of 2.8 m on both sides of the tension member 24h.
It has a cross-sectional structure in which m optical cords 24i and 24j are arranged to face each other. With the base end cable portion 24b having this cross-sectional structure, it does not easily roll on a flat mounting surface such as on the floor, under the floor, behind the ceiling, in a groove, or the like, and there is no risk of damaging the optical cords 24i and 24j. In addition, one of the two optical cords 24i and 24j is a dummy code, and the optical fiber does not need to be passed through. Optical cable 24 or optical cable 5
Can also be configured. In the cross-sectional structure shown in FIG. 3B, a tension member 24m is housed in the center of a circular outer cover 24k, and optical cords 24n and 24o having a diameter of 2.8 mm are arranged on both sides of the tension member 24m so as to face each other. I have. In this cross-sectional structure, due to the circular cross-sectional shape, it is easy to lay the pipe or the like in a pipe having a circular cross section, and the laying workability can be improved. Also in this cross-sectional structure, it is general that one of the two optical codes 24n and 24o, for example, the optical code 24o is a dummy code.

Next, the optical wiring in the optical wiring board 23 will be specifically described. As shown in FIG. 4, an optical distribution board 23 arranged near the transmission apparatus 1 is composed of a plurality of optical distribution boards 2, 3, and 4. 1 of the branch optical cable 24 connected to the branch cable 2
4e, optical fibers 6, 7 drawn from optical cable 5
(Mainly an optical cord).

First, an optical wiring constituted by using the optical cable 5 will be described. A plurality of optical connectors 1a of the transmission device 1 are pulled out from one end of the optical cable 5,
The optical fibers 6 and 7 terminated so as to be connectable by the optical connectors 6b and 7b are switchably connected. On the other hand, the optical fibers 6 and 7 drawn from the other end of the optical cable 5 are drawn into the optical distribution board 23.

Of the optical fibers 6, 7, the optical fiber 6
Are pulled into the optical distribution board 4 via the optical distribution boards 2 and 3, and in the optical distribution board 4, a large number of optical fibers 9 (mainly an optical fiber core or an optical fiber) pulled out from the optical cable 8. To the cord) by the optical connectors 6a and 10 in a switchable manner. More specifically, a flat storage card 4 for storing the optical connector 10 at the tip of the optical fiber 9 and the extra length is provided at a terminating portion 4 a provided in multiple stages in the optical distribution board 4.
The optical fibers 6 are stored in a large number in a vertical and horizontal arrangement, and the optical fibers 6 are connected to the tips of the optical fibers 9 taken out from the storage card 4a by optical connectors 6a and 10. The optical fiber 9 pulled out to the other end of the optical cable 8 is connected to the target optical fiber 14 drawn out to the terminal of the external optical cable 13 via the fusion splicing section 12 at the fusion splicing frame 11, so that the optical fiber By switching and connecting the optical fibers 6 and 9 within the panel 4, the target optical fibers 6 and 14 on the device side and the cable side are switchably connected to each other via the optical fiber 9 of the optical cable 8. .

On the other hand, the optical fiber 7 is provided with a jumper cord 21 which is a switching optical cord communicated between the optical distribution boards 3 and 4.
And is switchably connected to the optical fiber 9 on the optical cable 8 side. In FIG. 5, one end of the jumper cord 21 is connected to an optical connector 21b (SC-type optical connector), and the two ends of the jumper cord 21 are connected by an optical connector 21b (SC type optical connector). 21c, the other end of which is a two-core switching cord portion 21d, the connection cord portion 21c and the switching cord portion 21d.
and a fixed portion 21f is provided between the fixed portion 21d and the fixed portion 21d. The fixing portion 21f is assembled into a small unit having an elongated rectangular parallelepiped shape, and has a structure that can be easily attached to the cord fixing portion 20c in the optical wiring board 4. The connecting cord portion 21c is pulled out from one longitudinal end (right side in FIG. 5) of the fixing portion 21f, and the two-core switching cord portion 21d is pulled out from the other longitudinal end. The tip of each switching cord portion 21d is a two-core optical connector 21g.
(MT type optical connector). In addition, the connection code part, the switching code part,
Needless to say, the number of corresponding cores of the optical connector 21g and the like and the number of switching cords are not limited to those described above and can be changed as appropriate.

In FIG. 4, the connecting cord portion 21c of the jumper cord 21 is connected to the optical connector 2 within the optical distribution board 3.
It is switchably connected to the optical fiber 7 on the device side via 1b and 7a. On the other hand, the switching cord portion 21d is switchably connected to the optical fiber 9 on the cable side via the optical connectors 21g and 10 in the termination 4a of the optical distribution board 20. Therefore, when the switching cord portion 21d is switched and connected to the optical fiber 9, the switching between the optical fibers 7 and 9 is switched and connected via the jumper cord 21, and at the same time, the optical fiber 7 is connected to the outside line via the optical fiber 9. Optical cable 13
Is switched and connected to the target optical fiber 14.

Optical connector 6 arranged in optical distribution board 4
a, 10 and 21 g, which are excellent in switching connectivity, JI
As the so-called MT type optical connector (Mecanically Transferable) established in SC5981 and the like, and the optical connectors 7a and 21b arranged in the optical distribution board 3, SC type optical connectors are generally adopted. Optical fiber 6
Is, for example, a two-core optical cord formed by coating a two-core optical fiber tape core with a tube, and the end of which is terminated by an optical connector 6a which is a two-core MT optical connector. The optical fiber 7 is obtained by terminating the tip of a single-core optical cord with an SC optical connector. Examples of the jumper code for a normal line used in place of the jumper code 21 include, for example,
A configuration in which one end is terminated by a single-core optical connector which is an SC optical connector, and the other end is terminated by an optical connector which is a two-MT optical connector. A single-core optical cord or the like terminated by a single-core optical connector is used.

Next, an optical wiring constituted by using the branch optical cable 24 will be described. The connection cord 21c of the jumper cord 21 is connected to the branch cord 2 via optical connectors 21b and 24f instead of the optical fiber 7.
4e can be switchably connected. When the branch cord portion 24e is connected to each of the two optical connectors 21b of the connection cord portion 21c, one and two optical fibers 9 are connected to the branch cord portion 24e via one jumper cord 21. , And further connected to the transmission apparatus 1 via a branching optical cable 24. The one-core optical transmission line of the optical fiber 9 is directly connected to the branch cord portion 24e via the one-core optical transmission line of the jumper cord 21. Similarly, also in the other optical distribution board 23, the branch cord portion 24e
Can be connected to the jumper cord 21.

The eight branch cord portions 24e of the branch optical cable 24 are respectively drawn into one or a plurality of optical distribution boards 23 and connected to the jumper cord 21 (specifically, the connection cord portion 21c). Then, a PDS line that shares one line on the transmission device 1 side is configured by the line on the external optical cable 13 side for eight cores. Each branch code part 24e
Are distributed not to the same optical distribution board 23 but to a plurality of optical distribution boards 23, the PDSs in which the lines on the plurality of external optical cables 13 share the same line on the transmission device 1 side The line is configured. The number of branch cords 24e drawn into each optical distribution board 23 is not limited to one, and may be plural.

By the way, the optical connector 6 on the optical cable 5 side
b, 7b, and the optical connector 24a at the distal end of the base end cable portion 24b of the branch optical cable 24 can be switchably connected to the optical connector 1a on the transmission device 1 side.
The optical connectors 6a and 7a on the optical cable 5 side and the optical connector 24f on the tip of each branch cord portion 24e of the branch optical cable 24 can be switchably connected to the optical connector 21b on the jumper cord 21 side. The optical cable 5 and the branch optical cable 24 can be freely exchanged between the cord 21 and the transmission device 1. However, the optical cable 5 that can be replaced with the branching optical cable 24 generally has only the optical fiber 6. When replacing the optical cable 5 having the optical fibers 6 and 7 with the branch optical cable 24, the optical fiber 9 connected to the optical fiber 7 may be used as an unused line, or the optical fiber 7 of another optical cable 5 or a jumper may be used. It will be connected to the cord 21. Conversely, if the branch optical cable 24 is removed and replaced with the optical cable 5, the PDS line can be switched to the normal line. At this time, the branch optical cable 24 is economically advantageous because it can be reused.

According to this optical distribution system, one line on the transmission apparatus 1 side is shared by a plurality of lines on the external optical cable 13 via a plurality of optical distribution boards 23 provided individually for the external line optical cable 13. Becomes possible. Moreover, since the branch cord portion 24e of the branch optical cable 24 is switchably connected to the jumper cord 21, it is also possible to switch the connection to the jumper cord 21 between the optical distribution boards 23. A line on the external optical cable 13 side can be freely selected and connected to a target line on the device 1 side. Further, as long as the branch cord portion 24e is pulled into the optical distribution board 23, the branch optical cable 24 can be easily connected to the connection cord portion 21c of the jumper cord 21 regardless of the structure of the optical distribution board 23. There are advantages that can be. For example, depending on the optical wiring board, a structure in which a unit for coupler connection cannot be mounted, a structure in which the jumper cord 21 cannot be incorporated, and a structure in which a space for performing a jumper switching operation cannot be secured even if the jumper cord 21 can be incorporated itself can be provided. However, if the branch cord portion 24e is drawn into the optical distribution board 23, it can be connected to the connection cord portion 21c, and a wiring route is secured in the optical distribution board 23. As long as it is possible, it is not necessary to secure a special storage space or the like.
1c can be easily connected. As a connection target of the branch cord portion 24e, various configurations such as a termination plate on which a number of optical connectors 21b on the side of the jumper cord 21 are attached and a unit in which the optical connectors 21b are assembled can be applied. Property is obtained. If the configuration of the optical connector 21b to be connected is changed, the branch cord portion 24
It goes without saying that the optical connector 24f on the e side is also changed to a connector that can be connected to the optical connector 24f.

The branching optical cable 24 is made into a cable as a whole, can be freely laid in the station 20, and can be easily interposed and arranged in a target optical line only by replacing the existing optical cable 5. 5 can be easily switched, so that the target optical line in the optical wiring system can be freely switched between the PDS line and the normal line. Also, the branch optical cable 24 has a smaller number of parts compared to separately installing an optical distribution board dedicated to branch connection using an optical coupler, and has an extra length secured in the branch cord portion 24e and a coupler housing portion. Since the storage position of 24d is free, cost reduction and space saving can be achieved. By avoiding the installation of an optical distribution board dedicated to branch connection, there is an advantage that the inside of the station 20 is not narrowed, and workability in the station 20 can be secured.

The present invention is not limited to the above-described embodiment. For example, the branch cord section 24e, the optical fibers 9, 14
Needless to say, the number of cores of the jumper cord 21 and the type of optical connector attached to the terminal can be changed as appropriate. The present invention also includes a configuration in which the branch cord portion is directly connected to the cable-side optical fiber with a connector. In this case, it is needless to say that the branch cord portion, the number of cores of the cable-side optical fiber, the branch cord portion, the optical connector attached to each of the cable-side optical fibers, and the like are adapted to enable connector connection. . Further, all the cable-side optical fibers can be connected to the transmission device via the branch optical cable. As an optical distribution board,
Various configurations can be employed. For example, a configuration in which the function of connecting the branch cord portion 24e and the switching optical cord 21 of FIG. In this case, the optical wiring board 3 can be omitted. Further, for example, the switching optical cord 21 can be easily interrupted between the optical fiber 9 and the branch cord portion 24e on the device side. In the present invention, it goes without saying that a configuration in which no optical fiber such as a jumper cord is interposed between the branch cord portion of the branch optical cable and the cable-side optical fiber can be adopted. The optical fiber on the optical distribution board side according to the second aspect includes all the optical fibers connected to the branch cord portion of the branch optical cable in the optical distribution board. For example, the optical fiber 9 and the switching optical cord 21 shown in FIG. 4 correspond to this.

[0024]

As described above, the optical wiring system according to the first aspect has the following excellent effects. (A) An optical distribution board provided separately for a plurality of external optical cables and a transmission device are connected by a branching optical cable having an optical coupler interposed therebetween, and the transmission device is connected via the branching optical cable. One line can be shared by a plurality of lines on the external optical cable side. (B) Since the branching optical cable can be manufactured at a lower cost than a dedicated optical distribution board or the like, an optical wiring in which one line on the transmission device side is shared by a plurality of lines on the external optical cable side can be obtained at a low cost. Since the branching optical cable can be easily reduced in size and does not require any special installation space, cost reduction and space saving can be achieved. (C) An optical coupler can be incorporated in an optical line between an optical distribution board and a transmission device without increasing the number of connection points, thereby preventing an increase in connection loss. (D) Since the branching optical cable is switchably connected to both the cable side optical fiber and the transmission device, it is easy to replace the existing optical cable and switch between the PDS line and the normal line. It can be easily performed. With the switching of the lines (e) and (d), the detached optical cable for branching can be reused and is economically excellent.

According to the optical cable for branching according to the second aspect, the base end cable portion whose end is terminated by the optical connector and is connected to the transmission device, and the coupler housing housing the optical coupler from the base end cable portion. Branched through the part, the tip terminated by the optical connector, respectively,
Since it is provided with a plurality of branch cord portions that are drawn into any selected optical distribution board and are connected to the optical fiber and connected to the connector, simply connecting between the plurality of optical distribution boards and the transmission device, An optical coupler can be easily incorporated in the middle of the optical line, and the optical line between the plurality of optical distribution boards and the transmission device can be a PDS line. In addition, it can be manufactured at a lower cost than a dedicated optical wiring board, etc., and can be easily reduced in size, and it is not necessary to secure a special installation space, so that cost reduction and space saving can be achieved. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, and is an optical wiring diagram showing intra-office optical wiring as an optical wiring system configured using a branching optical cable.

FIG. 2 is a plan view showing the branch optical cable of FIG. 1;

3A and 3B are cross-sectional views showing a cross-sectional structure of a base cable portion of the branch optical cable shown in FIG. 2, wherein FIG. 3A is a cross-sectional view showing a flat cross-section, and FIG. It is.

FIG. 4 is a front view showing an optical wiring board in the optical wiring system according to the embodiment of the present invention.

FIG. 5 is an optical wiring diagram of an optical transmission system near the optical wiring board in FIG. 4;

FIG. 6 is a diagram showing a conventional optical wiring system;
FIG. 3 is an optical wiring diagram showing optical wiring in a station.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transmission apparatus, 5 ... Optical cable, 6a, 6b, 7a, 7
b: optical connector, 8: cable-side optical fiber (optical cable), 9: cable-side optical fiber, 13: external optical cable, 21: optical fiber connected to the cable-side optical fiber / optical fiber on the optical distribution board side (for switching Optical cord), 23
... Optical distribution board, 24 ... Branch optical cable, 24a ... Optical connector, 24b ... Base end cable part (code cable), 2
4c: optical coupler, 24d: coupler housing section, 24e: branch cord section, 24f: optical connector.

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[Procedure amendment]

[Submission date] April 19, 1999 (1999.4.1
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

3. A base cable section (24b) having a distal end terminated by an optical connector (24a) and connected to a transmission apparatus by a connector, and an optical coupler (2) is connected to the base cable section.
4c) are branched via a coupler housing portion (24d) housing therein, and the respective ends terminated by the optical connector (24f) are drawn into any one of a plurality of optical distribution boards selected from a plurality of optical fibers. a branch code of a plurality of which are connector (24e) and Ri Na and wherein the proximal cable portion has a tension member (24h, 2
4m), and a wiring is provided between the transmission device (1) and the optical distribution board (23).
By doing so, a plurality of optical fibers (9, 2,
1) is branched and connected to the transmission device.
There branch optical cable which is characterized in Rukoto (24).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the first aspect of the present invention, a plurality of cable-side optical fibers on the side of an external optical cable are connected via a plurality of optical distribution boards provided individually for the plurality of external optical cables. An optical wiring system branch-connected to an optical line on a transmission device side, wherein the optical line on the transmission device side comprises a base cable portion connected to the transmission device via a connector, and an optical coupler comprising the base cable portion. And a plurality of branch cord portions branched via a coupler housing portion that houses the branch cord portion, and the branch cord portions are drawn into a plurality of the optical distribution boards, respectively,
By connecting a connector to the cable-side optical fiber or an optical fiber connected to the cable-side optical fiber, a plurality of cable-side optical fibers related to a plurality of the external optical cables are connected via the branching optical cable. An optical cable connected to a transmission device, and between the optical distribution frame and the transmission device, both ends of which are connectable by an optical connector, and a branch by an optical coupler is not interposed in the middle; and An optical wiring system characterized in that it can be replaced with a branch optical cable is a means for solving the problem. Claim 2
Akira is using multiple optical fiber cables on the external optical cable side.
Cable is provided for each of the plurality of external optical cables.
Through a number of optical distribution boards,
An optical wiring system for branch connection, wherein the transmission device
The side optical line accommodates the tension member and the transmission
The base cable part to be connected to the device and this base end
From the cable section, through the coupler storage section that stores the optical coupler
And a plurality of branch code sections branched
An optical cable for branching, wherein the branch cord portion is provided with a plurality of front end portions.
It is pulled into the optical distribution board and
Fiber or light connected to the cable side optical fiber
By connecting a connector to the fiber,
Plural cable-side optical fibers related to external optical cable
Is connected to the transmission device via the branch optical cable.
It is characterized by having been done. In the invention according to claim 3 ,
A base end cable end is terminated by an optical connector and connected to the transmission device through a connector, and the base end is branched from the base end cable portion through a coupler housing portion housing an optical coupler. The tip that was
Ri Na and a branch code of the plurality of which are the optical fiber and the connector is drawn into one of the optical wiring board selected from a plurality, the proximal cable portion, the tension
The member is housed between the transmission device and the optical distribution board.
Multiple optical fibers in the optical distribution board
Was a branch optical cable which is characterized that you have adapted to the branch connected to the transmission device as a solution to the above problems. The invention according to claim 4 is a branch according to claim 3.
Optical cables for multiple optical distribution boards
By branching the fiber to the transmission device,
The optical line between the optical distribution board and the transmission device is a PDS line
It is characterized by the following.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

[0024]

As described above, according to the optical wiring system of the present invention , the following excellent effects can be obtained. (A) An optical distribution board provided separately for a plurality of external optical cables and a transmission device are connected by a branching optical cable having an optical coupler interposed therebetween, and the transmission device is connected via the branching optical cable. One line can be shared by a plurality of lines on the external optical cable side. (B) Since the branching optical cable can be manufactured at a lower cost than a dedicated optical distribution board or the like, an optical wiring in which one line on the transmission device side is shared by a plurality of lines on the external optical cable side can be obtained at a low cost. Since the branching optical cable can be easily reduced in size and does not require any special installation space, cost reduction and space saving can be achieved. (C) An optical coupler can be incorporated in an optical line between an optical distribution board and a transmission device without increasing the number of connection points, thereby preventing an increase in connection loss. (D) Since the branching optical cable is switchably connected to both the cable side optical fiber and the transmission device, it is easy to replace the existing optical cable and switch between the PDS line and the normal line. It can be easily performed. With the switching of the lines (e) and (d), the detached optical cable for branching can be reused and is economically excellent.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

According to the branching optical cable of the present invention , a base end cable portion whose end is terminated by an optical connector and is connected to a transmission device, and a coupler housing portion housing an optical coupler from the base end cable portion. Each of the optical fibers is provided with a plurality of branch cords, each of which has a plurality of branch cords which are drawn into one of the selected optical distribution boards and connected to the optical fiber through a connector. By simply connecting between the optical distribution board and the transmission device, an optical coupler can be easily incorporated in the middle of the optical line.
Can be a line. In addition, it can be manufactured at a lower cost than a dedicated optical wiring board, etc., and can be easily reduced in size, and it is not necessary to secure a special installation space, so that cost reduction and space saving can be achieved. It has excellent effects.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 ... Transmission device, 5 ... Optical cable, 6a, 6b, 7a, 7
b: optical connector, 8: cable-side optical fiber (optical cable), 9: cable-side optical fiber, 13: external optical cable, 21: optical fiber connected to cable-side optical fiber, optical fiber on optical distribution board side (for switching Optical cord), 23
... Optical distribution board, 24 ... Branch optical cable, 24a ... Optical connector, 24b ... Base end cable part (code cable), 2
4c optical coupler, 24d coupler housing part, 24e branch cord part, 24f optical connector , 24h, 24m ten
Member . ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 30, 1999 (1999.8.3)
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Optical wiring system

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

By the way, a plurality of lines (optical fibers) on the side of the external optical cable 50 are used to transmit the transmission device 5.
To be able to share the same line (optical fiber) on two sides (change to the so-called PDS method. PDS: Passive)
Double Star), with an optical coupler in the middle of the optical line,
A plurality of optical transmission lines on the external optical cable 50 side are branched and connected to the optical fiber on the transmission device 52 side. Optical distribution board 5
For example, providing an optical coupler in the middle of an optical line between the external optical cable 50 and the optical fiber on the side of the transmission device 52 within the optical line 1 can be achieved by, for example, connecting a dedicated unit containing optical components such as an optical coupler to an optical wiring. It can be implemented by mounting it in the panel 51 and taking measures such as connecting optical fibers from both sides of the external optical cable 50 and the transmission device 52 through this unit. However, in order to allow the same line on the transmission device 52 side to be shared by a plurality of lines distributed over a plurality of different external optical cables 50, there is no appropriate means so far, and this can be performed simply at low cost. The development of feasible technology was required. For example, the optical distribution board 51 and the transmission device 5
2, a dedicated optical distribution board for connecting an optical coupler is installed, and an optical coupler is interposed in the optical line between the optical distribution board 51 and the transmission device 52. It is conceivable that a plurality of lines on the optical distribution board 51 side (external optical cable 50 side) are branched and connected to the same line on the transmission device 52 side via a coupler. However, in this case, the number of parts is reduced by installing a new optical distribution board. Increase in cost due to the increase in
The number of connection points for connecting each optical fiber on the transmission side and on the transmission device 52 side to the optical coupler must be increased. The increase in the number of connection points causes a decrease in connection work efficiency and an increase in connection loss. In addition, installation of a new optical distribution board becomes impossible due to the floor area in a station where the optical distribution board 51 and the transmission device 52 are installed, or the optical distribution board and the transmission device 52 are connected to a plurality of floors. In addition, there is a problem in that the optical fiber cable 53 (intra-office optical cable) is required.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

The present invention has been made in view of the above-mentioned problems, and an optical coupler is provided in the middle of an optical line between a plurality of optical distribution boards and a transmission device without increasing the number of components and connection points. and an object thereof is to <br/> provide an optical interconnection system that can be easily interposed at a low cost.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the first aspect of the present invention, a plurality of cable-side optical fibers on the side of an external optical cable are connected via a plurality of optical distribution boards provided individually for the plurality of external optical cables. An optical wiring system branch-connected to an optical line on a transmission device side, wherein the optical line on the transmission device side comprises a base cable portion connected to the transmission device via a connector, and an optical coupler comprising the base cable portion. And a plurality of branch cord portions branched via a coupler housing portion that houses the branch cord portion, and the branch cord portions are drawn into a plurality of the optical distribution boards, respectively,
By connecting a connector to the cable-side optical fiber or an optical fiber connected to the cable-side optical fiber, a plurality of cable-side optical fibers related to a plurality of the external optical cables are connected via the branching optical cable. An optical cable connected to a transmission device, and between the optical distribution frame and the transmission device, both ends of which are connectable by an optical connector, and a branch by an optical coupler is not interposed in the middle; and An optical wiring system characterized in that it can be replaced with a branch optical cable is a means for solving the problem. According to the second aspect of the present invention, the plurality of cable-side optical fibers on the side of the external optical cable are branched to the optical line on the transmission device side via the plurality of optical distribution boards individually provided for the plurality of external line optical cables. An optical wiring system to be connected, wherein the transmission device side optical line houses a tension member and is connected to the transmission device through a connector, and an optical coupler is housed from the base cable portion. And a plurality of branch cord portions branched through the coupler housing portion, the branch cord portion is pulled into a plurality of optical distribution boards, respectively, the cable-side optical fiber or By connecting a connector to the optical fiber connected to the cable-side optical fiber, a plurality of cable-side optical fibers related to the plurality of external optical cables are connected. There was an optical wiring system, characterized in that it is connected to the transmission device via the branching optical cable as solutions of the problems.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the optical wiring <br/> system follows the present invention will be described with reference to FIGS. FIG.
Is an optical wiring diagram showing intra-office optical wiring which is the optical wiring system of the present embodiment, FIG. 2 is a plan view showing a branching optical cable 24 applied to the optical wiring system, and FIG. FIG. 3A is a cross-sectional view showing a cross-sectional structure of a base end cable portion 24b of the optical cable 24, and FIG.
4B is a cross-sectional view showing a circular cross-section, FIG. 4 is a front view showing the optical distribution board 23, and FIG. 5 is an optical wiring diagram of an optical transmission system near the optical distribution board 23.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

Optical connector 2 at the distal end of base cable section 24b
4a, the optical connector 24f at the tip of the branch cord portion 24e is a so-called FC defined in JIS C 5973.
Fiber transmission system optical Co
nnector), a so-called SC type optical connector (Single fiber Coupling optical) defined in JIS C 5973.
fiber connector), a so-called MU-type optical connector (Miniature-Unit couplin) established by JIS C5983
g optical fiber connector) can be adopted. Also <br/>, minute岐用light cable, FIG. 1, without being limited to the branching optical cable 24 shown in FIG. 2, for example, the proximal cable portion, and the branch code part, these tip connectors The number of optical connectors that can be connected, the number of corresponding optical couplers and the number of branches, the number of branch cords, and the like can be appropriately selected. When a multi-core base end cable portion and a branch cord portion are employed, a multi-core optical connector is employed as an optical connector whose distal end is connectable to a connector.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

According to this optical distribution system, one line on the transmission apparatus 1 side is shared by a plurality of lines on the external optical cable 13 via a plurality of optical distribution boards 23 provided individually for the external line optical cable 13. Becomes possible. Moreover, since the branch cord portion 24e of the branch optical cable 24 is switchably connected to the jumper cord 21, it is also possible to switch the connection to the jumper cord 21 between the optical distribution boards 23. A line on the external optical cable 13 side can be freely selected and connected to a target line on the device 1 side. Further, as long as the branch cord portion 24e is pulled into the optical distribution board 23, the branch optical cable 24 can be easily connected to the connection cord portion 21c of the jumper cord 21 regardless of the structure of the optical distribution board 23. There are advantages that can be. For example, depending on the optical wiring board, a structure in which a unit for coupler connection cannot be mounted, a structure in which the jumper cord 21 cannot be incorporated, and a structure in which a space for performing a jumper switching operation cannot be secured even if the jumper cord 21 can be incorporated itself can be provided. Although there, as long as the branch code portion 24e, if e is drawn into an optical wiring board 23 can be connected with the connecting cord section 21c, moreover, the optical wiring board 23 is wiring path It is only necessary to secure them, and it is not necessary to secure a special storage space or the like.
1c can be easily connected. As a connection target of the branch cord portion 24e, various configurations such as a termination plate on which a number of optical connectors 21b on the side of the jumper cord 21 are attached and a unit in which the optical connectors 21b are assembled can be applied. Property is obtained. If the configuration of the optical connector 21b to be connected is changed, the branch cord portion 24
It goes without saying that the optical connector 24f on the e side is also changed to a connector that can be connected to the optical connector 24f.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

The present invention is not limited to the above-described embodiment. For example, the branch cord section 24e, the optical fibers 9, 14
Needless to say, the number of cores of the jumper cord 21 and the type of optical connector attached to the terminal can be changed as appropriate. The present invention also includes a configuration in which the branch cord portion is directly connected to the cable-side optical fiber with a connector. In this case, it is needless to say that the branch cord portion, the number of cores of the cable-side optical fiber, the branch cord portion, the optical connector attached to each of the cable-side optical fibers, and the like are adapted to enable connector connection. . Further, all the cable-side optical fibers can be connected to the transmission device via the branch optical cable. As an optical distribution board,
Various configurations can be employed. For example, a configuration in which the function of connecting the branch cord portion 24e and the switching optical cord 21 of FIG. In this case, the optical wiring board 3 can be omitted. Further, for example, the switching optical cord 21 can be easily interrupted between the optical fiber 9 and the branch cord portion 24e on the device side. In the present invention, it goes without saying that a configuration in which no optical fiber such as a jumper cord is interposed between the branch cord portion of the branch optical cable and the cable-side optical fiber can be adopted .

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Deleted

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 ... Transmission device, 5 ... Optical cable, 6a, 6b, 7a, 7
b: optical connector, 8: cable-side optical fiber (optical cable), 9: cable-side optical fiber, 13: external optical cable, 21: optical fiber connected to the cable-side optical fiber / optical fiber on the optical distribution board side (for switching Optical cord), 23
... Optical distribution board, 24 ... Branch optical cable , 24b ... Base end cable part (code cable), 24c ... Optical coupler, 24
d: coupler storage section, 24e: branch cord section, 24h, 2
4m ... tension member.

Claims (2)

[Claims] A plurality of cable-side optical fibers (8, 9) on the side of an external optical cable (13) are respectively connected via a plurality of optical distribution boards (23) provided individually for the plurality of external optical cables. Optical line (5, 24) on transmission device (1) side
An optical wiring system that is branched and connected to the transmission device, wherein the transmission device-side optical line includes a base cable portion (24b) connected to the transmission device via a connector, and an optical coupler (24c) from the base cable portion. A branch optical cable (24) including a plurality of branch cord portions (24e) branched via a housed coupler housing portion (24d), wherein the branch cord portion is connected to a plurality of optical distribution boards. Pull in,
Each of the cable-side optical fibers or the optical fiber (21) connected to the cable-side optical fiber is connected by a connector, so that a plurality of cable-side optical fibers of the plurality of external optical cables are connected to the branch optical fiber. It is connected to the transmission device via an optical cable, and between the optical distribution board and the transmission device, both ends are terminated by an optical connector (6a, 6b, 7a, 7b) so as to be connectable to a connector. An optical wiring system characterized in that an optical cable (5) in which no branching by an optical coupler is interposed and the branching optical cable are interchangeable. 2. A transmission device (1) and a plurality of optical distribution boards (2).
3) a branching optical cable for branching and connecting a plurality of optical fibers (9, 21) on each optical distribution board side to the transmission device, wherein the optical connector (24a) has a tip end. End cable part (24b) terminated by a connector connected to the transmission device
From the base end cable portion via a coupler housing portion (24d) housing an optical coupler (24c), and the ends terminated by an optical connector (24f) are respectively connected to one of the selected ones. A branching optical cable (24), comprising: a plurality of branching cords (24e) which are drawn into an optical distribution board and connected to the optical fiber by a connector.