JP2000241629A - Optical distributing board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical distributing board which can dispense with the use of a jamper cord, decrease the number of connecting points, reduce the size, heighten the density, reduce the cost, improve connecting workability, and has a structure of absorbing a slack of a device side optical fiber in a wiring route at a slack absorbing part, so that the device side optical fiber can be easily taken out, re-stored and moved. SOLUTION: This optical wiring board includes a slack absorbing part 34 in which the middle of a device side optical fiber 33 is wired, which is wired extending between a termination part 28 where an end part 29a having a cable side optical fiber 26 terminated to be connected by a connector and device side introducing parts 32, 62 in which the device side optical fiber 33 having the tip terminated to be connected by a connector is led, and the device side optical fiber 33 is wired in variable wiring route in the slack absorbing part 34, thereby absorbing the slack of the device side optical fiber 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical distribution board for switchably connecting a plurality of cable-side optical fibers on an optical cable side with a device-side optical fiber on a transmission apparatus side.

[0002]

2. Description of the Related Art FIG. 10 is a front view showing a conventional optical distribution board. In FIG. 10, reference numeral 1 denotes a box, and a plurality of optical cables 2 are drawn in from above or below. These optical cables 2 include those connected to a transmission device and those connected to an external optical cable. These optical cables 2 are arranged along the side plate 10 of the box 1, fixed at a branch portion 4a under the box 1 by a cable clamp 4b or a tension member clamp 4c, and are drawn out to draw out the optical fiber core 3a. I have. These optical fibers 3
a is drawn into the fusing section tray storage section T1 at the bottom of the box 1,
.. Are stored in a slide unit 12 provided in the fusion part tray storage part T1 in a drawer type fusion part tray 6, which is stacked and stored in multiple stages. In each of the fusion trays 6, 6,..., The optical fiber core wire 3a is connected to one end of the branch-out fan-out cord 3b, which is not branched, via a fusion splicing reinforcement (not shown).

[0003] The fan-out code 3b is pulled out upward through a center tray 9 installed above the fusion part tray storage section T1.
b are introduced from the left side in the drawing into the drawer-type branch connection trays 8, 8,... stacked in multiple stages in the branch connection tray storage portion T2 installed above the center tray 9, The connection is switchably connected to a jumper code j (optical code) introduced into the branch connection tray 8 from the right through an optical connector (not shown). The branch connection trays 8, 8,... Are guided by guide rods 15 protruding from the back plate 11 of the box 1 and can be pulled out / stored in the front-rear direction (the depth direction on the paper of FIG. 10). The jumper code j is wired between the two branch connection trays 8, 8, and is connected to the other branched end of the fan-out cord 3 b in the branch connection tray 8, thereby connecting the target optical lines. The extra length of the jumper cord j can be stored in the tray 8 in the branch connection tray storage portion T2, or can be adjusted by using the support 4 (cord clamp) on the side surface of the box 1 so that It is absorbed by bending wiring so that it is folded back. When both ends of the jumper cord j are connected to the fan-out cord 3b in the branch connection tray 8, respectively, the transmission device side and the optical line on the external optical cable side are connected via the jumper cord j. Also, in the branch connection tray 8, the wiring 3d (optical code) introduced into the case 1 from the wiring wiring storage trays 9a and 9b arranged on the upper and lower parts of the case 1, the fan-out code 3b, and the like. May be connected.

FIG. 11 is a front view showing an example of an optical distribution board having an increased number of corresponding cores. In this optical distribution board, a line-side frame 17 that terminates an optical fiber 16a drawn from a line-side optical cable 16 and an optical fiber 18 that terminates a connector of a transmission device are connectably terminated. A device-side frame 19 and a relay frame C for storing a jumper code j wired between the line-side frame 17 and the device-side frame 19
And The track side frame 17 is a fusion tray tray storage 18
a and a branch connection tray storage section 18b, the apparatus side frame 19 includes a branch connection tray storage section 19b, and a jumper code j is provided for the branch connection tray storage section 18 of the both frames 17, 19.
b, 19b, and switchably connects between the optical fiber 16a on the line side and the optical fiber 18 on the transmission device side. In FIG. 11, reference numerals 19c and 19d denote extra length storage shelves, each of which stores the extra length of the jumper cord j with a small radius of curvature.

[0005]

By the way, in the optical distribution boards shown in FIGS. 10 and 11, both optical cables 2 and 1 are used.
A jumper cord j is interposed in the connection between the optical fibers 3a and 16a on the 6 side and the optical fibers 3a and 18 on the transmission device side. For this reason, there have been dissatisfactions such as an increase in connection loss due to an increase in the number of connection points, an increase in the number of parts, and an increase in the size of the optical wiring board due to securing a space for accommodating the extra length of the jumper cord j. Further, when the jumper cord j is interposed, there is a problem that the comparison of the optical fibers at the time of connection becomes complicated, and the connection work is troublesome. In particular, at the time of switching connection, since the wiring route of the jumper code j may be changed, there is a problem in workability, including the extra processing of the jumper code j.

The present invention has been made in view of the above-mentioned problems, and (1) the use of jumper cords can be omitted, whereby the number of connection points can be reduced, and miniaturization and high density can be achieved.
(2) The structure in which the excess length of the optical fiber on the device side is absorbed by the wiring route in the excess length absorbing portion, so that the optical fiber on the device side can be taken out and stored again. It is an object of the present invention to provide an optical wiring board that can be easily moved.

[0007]

The present invention has the following features to attain the object mentioned above. That is, in the present invention, an optical distribution board for switchably connecting a plurality of cable-side optical fibers on an optical cable side to a device-side optical fiber on a transmission device side, wherein the cable-side optical fiber is connectable to a connector. A termination portion in which the end portions are arranged, a device-side introduction portion into which the device-side optical fiber with a distal end terminated so as to be connectable with a connector is drawn, and a portion extending from the device-side introduction portion to the termination portion. The optical distribution board, characterized in that the device-side optical fiber to be wired is provided with a surplus length absorbing portion that absorbs a surplus length of the device-side optical fiber by being variably routed in the route. This was the solution to the problem. According to a second aspect of the present invention, in the optical distribution board according to the first aspect, the extra length absorbing portion is a pair of clamp portions for clamping the device-side optical fiber so as to be able to be taken out, and a multi-step vertically arranged between the clamp portions. And an R guide that is arranged in a curved manner and is bent and wired so that the device-side optical fiber is hooked. According to a third aspect of the present invention, in the optical distribution board according to the first or second aspect, among the device-side optical fibers introduced from the device-side introduction unit, unconnected ones that are not connected to any part are the same. It is characterized in that it is provided with an unconnected processing unit that receives the distal end that is drawn in via the extra length absorbing portion and that can be connected to the connector.

According to the present invention, the device-side optical fiber is
It is drawn from the device-side introduction section to the termination section, and is directly and switchably connected to the cable-side optical fiber by a connector.
The switching connection between the device-side optical fiber and the cable-side optical fiber is made by switching the connection of the device-side optical fiber to the end of the cable-side optical fiber. Therefore, no jumper code is required in this optical distribution board. The excess length of the device-side optical fiber is absorbed by the wiring route from the device-side introduction portion to the termination portion, and the remaining excess length is absorbed by the wiring in the excess-length absorbing portion. The excess length absorbing section may be provided at a position where the wiring route of the device side optical fiber from the device side introduction section to the termination section is detoured, whereby the device side optical fiber passes through the excess length absorbing section. The extra length can be absorbed simply by wiring. In the extra length absorption part, instead of winding the device side optical fiber with a small curvature radius and storing it,
The extra length is absorbed by the wiring of the device-side optical fiber inside. Therefore, in the extra length absorption section, the device-side optical fiber has an R30 that does not affect the optical signal transmission performance.
Is not continuously curved with a relatively small radius of curvature (but not less than R30), and even if there is a locally curved portion with a radius of curvature close to R30, the portion is continuously curved with the radius of curvature. It is not necessarily curved, but is gently wired as a whole. As described above, the extra length absorbing portion can absorb the extra length by the wiring of the device-side optical fiber, so that the extra-length processing can be performed as compared with the case where the device-side optical fiber is wound and stored with a small radius of curvature. The work is easy, and the target device-side optical fiber can be easily taken out.

As a specific configuration of the extra length absorbing portion, for example, the configuration described in claim 2 is employed. According to the second aspect of the present invention, the excess length absorption amount can be adjusted by bending the device side optical fiber between the pair of clamp portions of the excess length absorption shelf. At this time, by selectively using the R guides arranged in multiple stages at the top and bottom, the device side optical fiber can be efficiently bent and wired, and the bending state can be stably maintained. According to the third aspect of the present invention, since the device-side optical fiber that is not connected to the termination portion or the like is wired to the unconnected processing unit, much of the surplus length is absorbed. Only the end of the unconnected device-side optical fiber is stored. Therefore, it is not necessary to secure the capacity of the unconnected processing unit, and it is not necessary to increase the size. In this unconnected processing unit, it is more preferable that the device-side optical fiber be housed so that it can be easily taken out.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. (First Embodiment) FIGS. 1A, 1B and 2 are views showing an optical distribution board 20 according to a first embodiment of the present invention.
1A is a front view, FIG. 1B is a sectional view taken along the line AA of FIG. 1A, and FIG. 2 is a rear view of the optical distribution board 20 (however, FIG. Is enlarged and displayed). In these figures, this optical distribution board 20 is
, A device-side frame 22, and a relay frame 23 disposed between the two frames 21, 22.
The rear side of the relay frame 23 (the depth side in FIG.
The optical cable 24 on the outside line drawn into the front side of the drawing)
Is fixed to a cable introduction portion 25 above the relay frame 23 by a fixing component (not shown), and the cable-side optical fiber 26 pulled out from the terminal of the optical cable 24 is also connected to the cable on the rear side of the relay frame 23. The extra length is curved and stored so as to hang in the extra length storage portion 27 provided below the introduction portion 25. Cable side optical fiber 26
The distal end is drawn into the intended one of the termination portions 28 provided in multiple stages in the termination frame 21 from the rear side of the termination frame 21, and a plurality of tips are stored in the termination portion 28. Module-side optical fiber built into termination module 29 (not shown)
Connected to The extra length of the cable-side optical fiber 26 is also stored in an extra length storage box 30 provided for each termination section 28, and the wiring length to the intended termination module 29 is adjusted. Since the extra-length storage box 30 is opened upward, the extra-length storage box 30 is excellent in workability for storing and taking out the extra length.

FIG. 3 is a side view showing the termination module 29. As shown in FIGS. 1A, 2 and 3, the termination module 29 is a case having an external thin plate shape.
Many are arranged side by side. In each of the termination portions 28, the front side of the termination frame 21 (the front side in FIG.
Optical connector adapters 29a attached to the ends of the termination modules 29 are arranged on the middle right side. The optical connector adapter 29a is a multiple unit, and is connected to the cable-side optical fiber 26 via the module-side optical fiber, respectively, and corresponds to an end portion of the cable-side optical fiber 26 that is connected to the connector. .

As the cable-side optical fiber 26, a single-core or multi-core optical fiber core wire is mainly used, and a single-core or multi-core optical cord or the like can also be used. Also,
Until the cable-side optical fiber 26 reaches the extra-length storage box 30, it is usual that the cable-side optical fiber 26 is reinforced with a spiral tube or the like and then routed inside the relay frame 23. Cable-side optical fiber 26 not previously terminated with a connector
Is fusion-spliced with the module-side optical fiber, and the cable-side optical fiber 26, which has been pre-terminated, is connected to the pre-connector-terminated end of the module-side optical fiber. The multi-core cable-side optical fiber 26 is connected to the multi-core end of the module-side optical fiber for branch connection, is branched into a single core via this module-side optical fiber, and is connected to the optical connector adapter 29a. Thus, the distal end of the cable-side optical fiber 26 is terminated by the optical connector adapter 29a so as to be connectable to the connector. As an optical connector attached to the cable-side optical fiber 26 or the module-side optical fiber, for example, in the case of a single-core type, J
SC type optical connector (Si
ngle fiber Coupling optical fiber connector), etc.
For multi-core use, an MT type optical connector (Mecanically Transferable) specified in JIS C5981 or the like is adopted.

On the other hand, as shown in FIG.
Then, the device-side optical cable 31, which is an intra-station optical cable connected to the transmission device, is introduced into the device-side introduction portion 32 provided above the device-side frame 22, and the fixing jig 49c is provided.
(See FIG. 1B). This device side optical cable 31 The device side optical fiber 33 pulled out from the terminal
Is generally a single-core optical cord, and the side wall 2 of the device-side frame 22 is moved from the receiving shelf 32 a of the device-side introduction portion 32.
2a is drawn down to the curved storage portion 22b secured along the inner surface side, and from there, via the extra-length absorption shelves 34 provided in multiple stages vertically below the device-side frame 22, the relay frame 23
As shown in FIG. 3, the leading end of the connector 23 is pulled into the wiring section 23 a on the front side and further into the target terminating section 28 from the front side of the termination frame 21. The connection is switchably connected to the connector adapter 29a. As shown in FIG. 1, in the relay frame wiring portion 23a, the extra length 33a secured in the device-side optical fiber 33 is moved downward between the connection end 28 and the extra length absorption shelf 34. Curving is absorbed by wiring in a hanging manner. In FIG. 3, reference numeral 28a denotes a termination module 29.
Is an optical fiber storage gutter for storing the device-side optical fiber 33 connected to the device, and 28b is a cord saddle.

The device-side optical cable 24 and the device-side optical fiber 33 both correspond to the device-side optical fiber according to the first aspect. Since the device-side optical fiber 33 is an optical cord, the device-side optical fiber 33 can be freely bent and wired from the device-side introduction portion 32 to the termination portion 28, and can be switched to the optical connector adapter 29a. No worries about getting hurt. Optical connector 3 at the end of the device side optical fiber 33
As the optical connector adapter 5a and the optical connector adapter 29a, an SC type optical connector is employed. In addition, as the optical connector 35 and the optical connector adapter 29a, it is preferable to adopt a push-on type that is easy to attach and detach in the case of multiple cores. For example, an MPO type optical connector (Multifiber Push) defined in JIS C5982. On) is adopted. This makes it possible to employ a multi-core device-side optical fiber 33, which contributes to multi-core and higher density.

The length of each device-side optical fiber 33 drawn from the device-side optical cable 31 is often constant. Termination part 28 in termination frame 21 to be connected
Due to the difference in position (height) and the difference in the storage position of the termination module 29 in each termination part 28 (position in the horizontal direction, that is, the distance from the relay frame 23). A change of 33a occurs. Therefore, in the optical distribution board 20, for example, a surplus absorption shelf 34 through which the device-side optical fiber 33 passes is allocated to each termination section 28, and furthermore, a curved wiring in the relay frame wiring section 23a is added. ,
The extra length of the device-side optical fiber 33 is absorbed by the wiring route in the extra length absorption shelf 34. Relay frame wiring unit 2
In 3a, if the excess length 33a is dropped to the lower end of the relay frame 23 and turned upward, the amount of the excess length 33a absorbed in the relay frame wiring portion 23a can be increased. Regarding the generated device-side optical fiber 33,
It is preferable to select and use the upper excess length absorption shelf 34.

FIG. 4 is a perspective view showing the extra length absorbing shelf 34. In FIG. 4, the extra-length absorbing shelf 34 is provided with a bottom plate 34 a that is provided obliquely, a pair of clamp portions 34 b that are provided on the bottom plate 34 a, and that clamp the device-side optical fibers 33 so that they can be taken out. This clamp portion 34b
In the meantime, on the bottom plate 34a, there are multiple stages up and down (in FIG. 4,
And an R guide 34c that is arranged and mounted in a three-stage configuration and is bent and wired so that the device-side optical fiber 33 is hooked from above. The clamp portion 34b is made of a resilient material such as rubber or sponge, and clamps the device-side optical fiber 33 so that the device-side optical fiber 33 can be taken out of the slit 34d. In this extra length absorption shelf 34, a curved portion 33b is formed when the device-side optical fiber 33 is passed through the R guide 34c as compared with a case where the optical fiber 33 is linearly drawn between the pair of clamp portions 34b. Therefore, the wiring length of the device-side optical fiber 33 is increased, and thereby, the extra length generated in the device-side optical fiber 33 can be absorbed. In the extra length absorption shelf 34, the selective use of the upper R guide 34c increases the curved portion 33b formed in the apparatus-side optical fiber 33, so that the extra length absorption amount can be increased.
Further, it is possible to further increase the excess length absorption amount by wiring the plurality of R guides 34c, for example, by bending the R guides 34c in an S shape. Each of the R guides 34c is a half-cylindrical columnar shape.
It is needless to say that a sufficient bending radius larger than a specified value is secured by being hooked on the curved surface of the bottom plate 34a of the bottom plate 34a.

The structure of the extra length absorption shelf is not limited to the one shown in FIG. 4, and the extra length absorption amount can be reduced only by changing the wiring route of the device side optical fiber 33 in this unit. Other configurations may be used as long as they can be easily adjusted. Further, it is preferable that the structure is such that the upper part is open and the wiring and taking out of the optical fiber (optical cord) are easy, like the extra length absorption shelf 34 shown in FIG. The extra length absorption shelf 34 is not limited to being used by being allocated to each termination section 28, and it is also possible to wire a device-side optical fiber 33 connected to the termination section 28 which does not correspond to the allocation. It is also possible to select and use a surplus absorption shelf simply in accordance with the surplus amount generated in the optical fiber on the device side, instead of the allocation for each termination section 28.

As shown in FIG. 1, the optical distribution board 20 further absorbs the extra length of the device-side optical fiber 33 by the upward turn position of the device-side optical fiber 33 dropped into the curved storage portion 22b. You can also. That is, from the receiving shelf 32a of the device-side introduction section 32, the device-side frame 2
The position of the lower end curved portion 33c generated by the upward turn of the device-side optical fiber 33 wired so as to be pulled down along the inner side of the side wall portion 22a of the second side portion 22a is determined by the extra length absorption shelf 34 for drawing in the device-side optical fiber 33. Near
The excess length absorption amount in the curved storage portion 22b is small, and the lower the level is below the target excess length absorption shelf 34, the more the bent storage portion 22b is.
The excess absorption at the point increases. Device side optical fiber 33
If the extra length 33a to be absorbed is particularly large, the absorption in the curved storage portion 22b can also be used. In FIG. 1, a plurality of cord guides 22c and 22d protruding from the apparatus-side frame side wall 22a suppress unnecessary floating of the apparatus-side optical fiber 33 and a large number of apparatus-side optical fibers 3a.
3 is also arranged for each extra length absorption shelf 34.

At the lower part of the terminal frame 21, a terminal 28, etc.
An unconnected processing unit 36 for storing the unconnected device-side optical fiber 33 tip that is not connected anywhere is provided. The unconnected processing unit 36 is connected to the device-side frame 2
The device-side optical fiber 33 that is provided separately from the second device-side introduction unit 32 and that is not connected passes through the lower part of the relay frame 23 from the device-side introduction unit 32 via the lowermost extra length absorption shelf 34. And reaches the unconnected processing unit 36, the device-side introduction unit 3
The wiring length from 2 to the terminal frame 21 is absorbed, and only the rest is absorbed in the unconnected processing unit 36. Therefore, the unconnected processing unit 36 does not need to secure a large storage capacity for the device-side optical fiber 33, and can be formed in a small size. The unconnected processing unit 36
When the device-side optical fiber 33 pulled out from the terminal 28 is connected to the termination 28, the wiring up to the termination frame 21 has been completed, so that the optical fiber 33 is pulled into the intended termination 28 (in some cases). Includes the change of the extra length absorption shelf 34 to be passed)
Can be easily used. Conversely, with respect to the device-side optical fiber 33 which has been disconnected from the termination portion 28 and is now in a standby state for use, the distal end portion is moved within the termination frame 21 and the unconnection processing unit 36 It can be easily processed simply by storing it in If the excess length of the unconnected device-side optical fiber 33 is excessive, the excess route is absorbed by selecting and passing the wiring route in the extra length absorption shelf 34 or the upper excess length absorption shelf 34. it can. When the extra length of the unconnected device-side optical fiber 33 is extremely short, it goes without saying that a processing method that does not pass through the extra length absorption shelf 34 can be adopted.

FIGS. 5A, 5B, and 5C are views showing the unconnected processing unit 36. FIG. 5A is a plan view.
FIG. 5B is a front view, and FIG. 5C is a side view. FIG.
As shown in (a), (b), and (c), the unconnection processing unit 36 is a device-side optical fiber 33 in a connection standby state.
, A plurality of R guides 36b arranged side by side at intervals above the optical fiber storage portion 36a, and a plurality of R guides 36b arranged side by side above the optical fiber storage portion 36a. A connector fixing portion 36c extending along the optical fiber storage portion 36a and fixing the optical connector 35 attached to the tip of the device-side optical fiber 33 pulled up through the gap between the adjacent R guides 36b. It is configured.

The connector fixing portion 36c has a plate shape in which a plurality of slits 36s are formed, and the optical connector 35 has a slit 36 on the side surface of the connector fixing portion 36c.
By inserting it into the slit 36s from the opening s (arrow B in FIG. 6A), the enlarged portion 35 at the tip of the optical connector 35 is inserted.
a is sandwiched in the slit 36s, and the falling from the slit 36s is regulated. After the optical connector 35 is fixed to the connector fixing part 36c, a detachable cover 36d is attached to the connector fixing part 36c, and the connector fixing part 36
Close the opening of the slit 36s on the side of c
In addition to restricting detachment of the optical connector 35 from the optical connector 35, the optical connector 35 covers the tip of the optical connector 35 that is directed upward to protect the optical connector 35 from dust adhesion and the like. Further, a protective cap 36i is attached to the tip of the optical connector 35. The device-side optical fiber 33 introduced into the unconnected processing unit 36 is
Since it is removably clamped by a clamp portion 36f provided near the entrance 36e of the gutter-shaped optical fiber storage portion 36a, an external force such as a tensile force applied to the device-side optical fiber 33 outside the unconnected processing unit 36. Or the vibration is caused by the device-side optical fiber 33 in the unconnected processing unit 36.
Can be prevented. As a result, the device-side optical fiber 33 in the unconnected processing unit 36 may be sharply bent by a tensile force and damaged, or the optical connector 35 may be damaged.
Can be prevented. The R guide 36
b has a curved surface 36g on the side opposite to the entrance 36e.
Even if a pulling force acts in the direction of pulling out from e, the device-side optical fiber 33 only bends along the curved surface 36g, and does not easily bend. The attachment and detachment of the cover 36d is easily performed by operating the knob 36h. When the cover 36 is removed, the optical connector 35 can be taken out from the slit 36s opened on the side surface of the connector fixing portion 36c. Unconnected processing unit 3
6 is not limited to the configuration shown in FIGS. 5A, 5B, and 5C, and various configurations that can easily store and take out the optical connector 35 and the optical fiber 33 can be adopted.

In FIG. 1, a test apparatus 37 (“FTU” in FIG. 1) provided near the unconnected processing unit 36 includes:
Built-in optical pulse tester such as OTDR
A core wire selecting device 3 disposed close to the rear side of the termination frame 21
By monitoring the return light of the test light incident on the optical line selected by 8 ("fs" in FIG. 2), disconnection or the like is monitored. In order to test a target optical line related to the cable-side optical fiber 26, for example, an optical coupler is built in the termination module 29, and the cable-side optical fiber 26 and the core selection device 38 are connected via the optical coupler. And test equipment 3
The test light output from 7 is incident on a target optical line from the core wire selecting device 38 via the optical coupler. In particular,
For example, as shown in FIG. 3, the test optical fiber 29 c (the virtual line in FIG. 3) connected to the cable-side optical fiber 26 via the optical coupler in the termination module 29 to the outside of the termination module 29. The extracted tip is connected to each of the terminations 28.
A connector is connected to the unit-shaped connecting portion 39 arranged above. The connection section 39 is connected to a core selection device 38 via a connection cable (not shown). This connection 3
9 shows all the termination modules 2 in the termination 28
The number of corresponding cores that enables the connection of the test optical fiber 29c according to No. 9 is generally secured.
While switching the selection of the optical fiber in 8 one by one,
By inputting test light from the test device 37, disconnection and the like can be sequentially monitored for a large number of optical lines on the optical cable 24 side. If the device-side optical fiber 33 is connected to the optical connector adapter 29a, the disconnection and the like of the device-side optical fiber line can be similarly monitored via the optical coupler. If the test is unnecessary, the termination module 2
It is not necessary to provide an optical coupler or a test optical fiber 29c in 9 and can be omitted.

In FIG. 1, reference numeral 40 denotes a splitter module storage section, which stores a plurality of splitter modules 41 in the form of a thin plate in appearance. FIG. 6 (a),
(B) is a figure which shows the splitter module 41,
FIG. 6A is a front view showing the optical connector adapter 42 attached to the side, and FIG. 6B is a side view showing the inside. In FIGS. 6A and 6B, the splitter module 41 includes an optical connector adapter 42 and an optical distribution board 2.
0 is housed in the splitter module housing 40 toward the front side (the front side in FIG. 1). The splitter module 41 accommodated in the splitter module 41, for example, has a single-core optical fiber 44 and eight single-core optical fibers 45 (hereinafter, “splitter code”).
Branch connection. The optical fibers 44 drawn from one end of the optical splitter 44 are switchably connected to the optical connector adapter 42 from the inside of the splitter module 41, respectively, and are splitters that are drawn from the other end of the optical splitter 43. Code 45 is
It is led out of the splitter module 41 from the opening 46 near the optical connector adapter 42. As shown in FIG. 1, the splitter cord 45 is drawn into the termination part 28 by using the code ducts 23b provided in multiple stages in the relay frame wiring part 23a, and the optical connector 47 (FIG. 6).
See (b). For example, an end which is connectable by an SC optical connector) is switchably connected to an optical connector adapter 29a of a target termination module 29. On the other hand, as shown in FIG.
Are switchably connected to a connector. As a result, one single-core device-side optical fiber 33 connected to the optical connector adapter 42 is branched and connected to the eight-core cable-side optical fibers 26 via the optical splitter 43 of the splitter module 41. be able to. In FIG. 6, since four optical splitters 43 are housed in the splitter module 41, up to four device-side optical fibers 33 can be connected via the splitter module 41.
Branch connection with 32 splitter cords 45 is possible.

As shown in FIG. 1, the optical connector adapter 4
2 is connected to the extra length absorption shelf 3.
4 through the relay frame wiring portion 23a,
The wiring is wired so as to be hooked from above on the R guide 23c on the upper part of the relay frame wiring portion 23a, and the end hanging down from the R guide 23c is drawn into the splitter module accommodating section 40, and the target splitter module 41 The optical fiber is connected to an optical connector adapter 42 (this device-side optical fiber is denoted by reference numeral 33 for convenience). As the optical connector 47 at the tip of the splitter cord 45, a connector having the same configuration as the optical connector 35 at the tip of the device-side optical fiber 33 is employed. Needless to say, the number of optical splitters housed in the splitter module 41, the number of branches by the optical splitters, and the like can be changed as appropriate.

In FIG. 1, a jumper cord 48 connects between the termination modules 29. Thus, the cable-side optical fibers 26 are connected to each other via the jumper cord 48. Both ends of the jumper cord 48 are connected to the optical connector 35 of the termination module 29 by an optical connector (not shown) having the same configuration as the optical connector 35 of the device-side optical fiber 33 and the optical connector 47 of the splitter cord 45, respectively. It is switchably connected to the adapter 29a. The extra length of the jumper cord 48 is absorbed into the relay frame wiring portion 23a by bending the R guide 23c above the relay frame wiring portion 23a so as to be hooked from above and hanging down.

In FIG. 1A, reference numerals 49a and 49b denote jumper cord storage shelves between frames, and jumper cords wired between the shelves are the jumper cord storage shelves 49a and 49b.
From 49b, it is drawn to a target position in optical distribution board 20. The connector-connected tip of this jumper cord is connected to the optical connector adapter 29a of the termination module 29,
It can be switchably connected to the optical connector adapter 42 of the splitter module 41.

According to the optical distribution board 20, the device-side optical fiber 33 drawn from the device-side introduction portion 32 to the termination portion 28 is provided.
Since the tip is directly and switchably connected to the optical connector adapter 29a of the intended termination module 29, no jumper cord is required. Therefore, the number of connection points is reduced, and connection loss can be suppressed low. Also,
A connection with a jumper cord requires a large number of jumper cords, and it is necessary to provide a terminating end of an optical fiber connected to the jumper cord for each connection with the jumper cord, which reduces costs. Although it is inevitable to increase the size and increase the size, the optical wiring board 20 according to the present invention does not require a jumper code, so that the cost can be reduced and the size can be reduced. it can. In addition, in the configuration in which the device-side optical fiber 33 is directly connected to the optical connector adapter 29a, which is the terminated end of the cable-side optical fiber 26, they are connected to each other as compared with a connection in which a jumper cord is interposed. Both optical fibers 26,
The contrast between 33 is easy, and the workability of the switching connection can be improved.

In the optical distribution board 20, the excess length of the device-side optical fiber 33 is bent and absorbed in the relay frame wiring portion 23a and the excess length absorbing shelf 34. The excess length is absorbed by the wiring route of the optical fiber 33, and a container such as an excess length storage case for storing the excess length with a small radius is not used. When the device-side optical fiber 33 is moved along with switching connection, etc., the extra length absorption shelf 34 corresponds to the extra length that occurs.
Is selected, and the wiring route in the selected extra length absorption shelf 34 is selected (such as selection of the R guide 34c to be inserted or hooked between the clamp portions 34b in FIG. 4),
Extra length can be easily absorbed. At this time, each extra length absorption shelf 34
Is tilted so that the exposed area on the front side of the optical distribution board 20 increases, so that the device-side optical fiber 33 is temporarily lifted from the extra-length absorption shelf 34 and stored in the target extra-length absorption shelf 34 for wiring. Just by doing it again, the work can be done very easily. The work involving the movement of the device-side optical fiber 33 includes not only switching connection of the termination unit 29 to the optical connector adapter 29a, but also storage and removal of the unconnected processing unit 36, connection and removal of the splitter module 41, and the like. . Also in these operations, the processing of the excess length of the device-side optical fiber 33 can be easily performed by selecting the excess length absorption shelf 34 and selecting the wiring route in the selected excess length absorption shelf 34.

The device side frame 51 of the optical distribution board 50 shown in FIG.
The device has a configuration in which a device-side introduction portion 32 is provided at a lower portion, a surplus absorption shelf 34 is provided above the device-side introduction portion 32, and a splitter module storage portion 40 is provided above the device. The internal configurations of the termination frame 21 and the relay frame 23 of the optical distribution board 50 are substantially the same as those of the optical distribution board 20 of FIG. 1 (the termination frame 21 has a jumper cord storage shelf 49a between frames). The position has changed). According to this optical distribution board 50, the position of the extra length absorption shelf 34 can be made higher than that of the optical distribution board 20 of FIG.
It is possible to increase the absorption amount of the extra length 33a to be absorbed by hanging in the inside a.

(Second Embodiment) Optical distribution board 60 shown in FIG.
Has a configuration in which a device-side introduction unit 62, an unconnected processing unit 63, a termination unit 64, and a splitter module storage unit 65 are stored in a frame 61 in this order from the bottom. The device side introduction part 62, the unconnected processing unit 63, the termination part 64, and the splitter module storage part 65 are all different in size from those of the optical distribution board 20 shown in FIG. Is the same.

In the optical distribution board 60, an external optical cable 24 (not shown) is introduced into a cable introduction section (not shown) provided on the cable introduction side (the rear side in FIG. 8). The pulled-out cable-side fiber (multi-core optical fiber such as a multi-core optical fiber ribbon) is passed through the module-side optical fiber of the target termination module 29 in the termination section 64 arranged in multiple stages vertically. The optical fiber adapter adapter 29a disposed on the front side of the frame 61 of each of the termination modules 29 (in front of the paper in FIG. 8) is branched and connected to the optical connector adapter 29a. On the other hand, the device-side optical cable 3 which is an intra-office optical cable introduced and fixed to the device-side introduction unit 63
The device-side optical fiber 33 pulled out from one terminal is drawn into a target termination portion 64 via an extra length absorbing portion 67 (curved region) provided along the inner surface of the side wall portion 66 of the frame 61. The optical connector adapter 29 of the termination module 29
The connector is switchably connected to a. Thereby, both the optical fibers 26 and 33 on the cable side and the device side are switchably connected. The device side optical fiber 33 wired from the device side introduction part 62 to the splitter module storage part 65, the device side optical fiber 33 wired from the device side introduction part 62 to the unconnected processing unit 63, the splitter module storage part 6
A splitter cord 45 pulled out from the splitter module 41 housed in the wire 5 and wired to the termination portion 64;
The jumper cord 68 wired between the termination modules 29 of the termination part 64 is also wired via the extra length absorbing part 67. In the lower part of the excess length absorbing portion 67, the optical fibers 33, 45, 68 are retained near the side wall portion 66 by the code guide 70. In FIG. 8, a jumper jumper cord introduced from a jumper jumper code storage shelf 71 installed on the upper part of the frame 61 also passes through the extra length absorbing section 67 and is connected to the optical connector adapter 29 a of the target termination module 29. And so on.

FIG. 9A is an enlarged front view showing the upper portion of the extra length absorbing portion 67, and FIG. 9B is a side view of the extra length absorbing portion 67 viewed from the inner surface side of the frame 61. As shown in FIGS. 9A and 9B, the excess length absorbing section 67 includes R guides 69 provided in multiple stages vertically. The optical fibers 33, 45, 68 (optical fiber 4) wired via the extra length absorbing portion 67
5 and 68 are not shown) are bent so as to be hooked on the R guide 69 from above, and wired inside the extra length absorbing portion 67, and then the intended termination portion 64 and the unconnected processing are respectively performed. The unit 63 is drawn into the splitter module storage section 65, whereby the extra length is absorbed. When the upper R guide 69 is selected and used, the storage length in the extra length absorbing portion 67 is generally increased, and more extra length is absorbed. Further, in the extra length absorbing portion 67, if the R guide 69 is used to bend and wire in, for example, an S-shape, the extra length absorbing amount in the extra length absorbing portion 67 can be further increased.

Therefore, also in the optical distribution board 60, the extra length of the optical fibers 33, 45, 68 is not stored in a dedicated tray or the like so as to be wound with a small radius of curvature. Since the light is absorbed by the curved wiring in the absorbing section 67, the movement and rewiring accompanying the switching connection of the optical fibers 33, 45, and 68 are easy. Further, since no jumper cord is interposed between the optical fibers 26 and 33 on the cable side and the device side, effects such as a reduction in connection loss, a reduction in cost, a reduction in size, and an increase in the number of cores can be achieved. 20 is obtained.

The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the configuration of the excess length absorption section is not limited to those described in the embodiments, and any configuration may be used as long as the excess length absorption amount can be adjusted by the wiring route of the optical fiber, and various configurations can be adopted. As the device-side optical fiber introduced into the device, other than the optical cable 31, an optical cord formed by coding the device-side optical fiber 33, a so-called code cable, or the like can be used. In some cases, an optical fiber core or the like can be adopted. The optical distribution board to which the present invention is applied is composed of two frames other than the one having three frames as in the first embodiment and the one having one frame as in the second embodiment. What, 4
Various configurations, such as the above-mentioned frame, can be adopted.

[0035]

As described above, according to the optical distribution board of the present invention, the device-side optical fiber can be drawn from the device-side introduction section to the termination section, and can be switched directly to the cable-side optical fiber. Since there is no jumper cord in the connection to the connector, the connection loss is reduced by reducing the number of connection points, the workability is improved by simplifying the comparison between optical fibers at the time of switching connection, and components such as jumper cords The cost can be reduced, the size can be reduced, the density can be increased, and the number of cores can be increased by reducing the number of processing units for connecting to the jumper code. Since the excess length is absorbed by selecting the wiring route in the extra length absorbing section, the device side optical fiber can efficiently increase the target extra length simply by changing the wiring route in the extra length absorbing section. Can be absorbed. In addition, changing the wiring route of the device-side optical fiber in the extra length absorption section is more complicated than winding it up and storing it in a dedicated container.
Since the work is simple, it is possible to respond flexibly and quickly to the change in extra length due to switching connection and the removal work due to the change in wiring route. To play.

According to the second aspect of the present invention, the device-side optical fiber is linearly wired between the pair of clamp portions of the extra-length absorbing shelf, or R guides arranged in multiple stages vertically are selectively used. It is possible to freely configure various wiring routes in the extra length absorption shelf, such as bending and wiring the device side optical fiber between the clamp sections, and to efficiently absorb the extra length of the device side optical fiber. It works.

According to the third aspect of the present invention, the apparatus-side optical fiber introduced from the apparatus-side introduction section is wired to the unconnected processing unit via the extra length absorbing section, so that most of the extra length is absorbed. In addition, the unconnected processing unit only needs to have a capacity that can accommodate only the tip of the unconnected device-side optical fiber, so that the size can be reduced. Also, since most of the length is absorbed by the wiring route, unlike the case where the extra length is wound around with a small curved radius and stored, it is easy to take out the device side optical fiber for use. It has an excellent effect of being.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing an optical distribution board according to a first embodiment of the present invention, wherein FIG. 1A is a front view, and FIG. 1B is a sectional view taken along line AA of FIG.

FIG. 2 is a rear view showing the optical distribution board of FIG. 1;

FIG. 3 is a side view showing a termination module applied to the optical distribution board of FIG. 1;

FIG. 4 is a perspective view showing a surplus absorption shelf applied to the optical wiring board of FIG. 1;

5A and 5B are views showing an unconnected processing unit applied to the optical wiring board of FIG. 1, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG.

FIGS. 6A and 6B are diagrams showing a splitter module applied to the optical distribution board of FIG. 1, wherein FIG. 6A is a front view and FIG. 6B is a side view.

FIG. 7 is a view showing a modification of the optical wiring board of FIG. 1;
It is a front view which shows the optical distribution board to which the apparatus side frame provided with the apparatus side introduction part in which an apparatus side optical cable is drawn in in the lower part is applied.

FIG. 8 is a front view showing an optical distribution board according to a second embodiment of the present invention.

9A and 9B are diagrams showing a surplus absorption portion applied to the optical wiring board of FIG. 8, wherein FIG. 9A is a front view showing an upper portion of the surplus absorption portion;
(B) is the side view which looked at the extra length absorption part from the inside of the frame.

FIG. 10 is a view showing a conventional optical distribution board, and is a front view showing an optical distribution board composed of one frame.

FIG. 11 is a view showing a conventional optical distribution board, and is a front view showing an optical distribution board composed of three frames.

[Explanation of symbols]

Reference Signs List 20: Optical distribution board, 24: Optical cable (outside optical cable), 26: Cable-side optical fiber, 28: Terminating part, 2
9a: end portion (optical connector adapter) of optical fiber terminated so as to be connectable to a connector, 31: device-side optical fiber (device-side optical cable, intra-station cable), 32: device-side introduction portion, 33: device-side optical fiber ( Optical cord), 34 extra length absorption shelf, 34b clamp part, 34c R guide, 36
... unconnected processing unit, 50 ... optical wiring board, 60 ... optical wiring board, 62 ... device side introduction part, 63 ... unconnected processing unit,
64: Terminating portion, 67: Extra length absorbing portion (curved region).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Sato 1440, Mukurosaki, Sakura-shi, Chiba Prefecture Inside Fujikura Sakura Plant Co., Ltd. (72) Inventor Kunihiko Jimbo 1440, Musaki, Sakura-shi, Chiba Prefecture Inside Fujikura Sakura Plant F Term (reference) 2H038 CA37 CA38

Claims (3)

[Claims] 1. An optical distribution board for switchably connecting a plurality of cable-side optical fibers (26) on an optical cable (24) side with an apparatus-side optical fiber (33) on a transmission apparatus side, wherein the cable side includes: Terminating portions (28, 64) in which the ends (29a) of the optical fibers terminated so as to be connectable to connectors are arranged.
A device-side introduction part into which the device-side optical fiber whose end is connected to a connector is drawn.
The middle of the device-side optical fiber that is wired from the device-side introduction section to the termination portion is variably routed so as to absorb the extra length of the device-side optical fiber. An optical distribution board (20, 50, 60), comprising: an absorber (34, 67). 2. A pair of clamps (34) for clamping the apparatus-side optical fiber so that the extra length absorbing part can be taken out.
b) and a plurality of vertically arranged between the clamp portions,
The optical distribution board (20, 20) according to claim 1, characterized in that the optical distribution board (20) is a surplus absorption shelf (34) including an R guide (34c) that is bent and wired so that the device-side optical fiber is hooked. 50). 3. An unconnected optical fiber that is not connected to any part of the device-side optical fiber introduced from the device-side introduction part is pulled in via the extra length absorption part, and its connector is connectable. The optical distribution board (20, 50, 60) according to claim 1 or 2, further comprising an unconnected processing unit (36, 63) for storing the tip terminated at the end.