JPH0627345A - Distribution optical module for optical fiber - Google Patents

Abstract

PURPOSE:To obtain a distribution optical module for an optical fiber capable of mechanically connecting a multiple optical fiber even in loop wiring and extremely facilitating connecting work. CONSTITUTION:In the distribution optical module 1 for the optical fiber for drawing a pair of optical fiber arrays 22 and 23 wired to be a loop-state line from an optical signal transmitting/receiving source 21 to transmitting/receiving terminals 24, 25, 26 and 27 at an optional position on the loop line; a pair of optical fiber arrays 22 and 23 led from both directions of the loop line are provided with ferrules 3, 4, 5 and 6 connected to be superposed at two steps so that the ends of corresponding paired optical fibers may be adjacent, and a housing in which the ferrules 3, 4, 5 and 6 are housed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber distribution optical module used for dropping an optical fiber wired from a station to an individual subscriber side.

[0002]

2. Description of the Related Art In optical communication, it is generally practiced to connect a multi-core optical fiber from a station which is a transmission / reception source of optical signals and to drop two optical fibers at each subscriber side. This is because one of the two cores that was pulled down had a broken fiber,
This is to enable optical communication using the other optical fiber even if a failure occurs, or to use each of the two cores for transmission and reception. FIG. 3 shows a distribution mode which is generally performed to drop the optical fiber. This figure shows a case where an optical fiber is distributed from the station 31 to four subscriber homes 32, 33, 34 and 35.
6 is wired, and the optical fiber 36 is distributed to each of the two fibers at the connection portion 37 and is dropped to each subscriber's home 32, 33, 34, 35. In this case, the distribution optical module is used at the connection portion 37 of the optical fiber 36 to distribute the multi-core optical fiber 36 to each subscriber's house 32, 33, 34, 35. The distribution optical module has a structure in which a ferrule for connecting an optical fiber is housed in a housing. In the distribution mode from such a station 31, when the multi-core optical fiber 36 is connected to the distribution optical module, a multi-core optical fiber is connected. Of the fibers 36, the first and second from one end are connected to the ferrule for the subscriber's home 32, the third and the fourth are connected to the ferrule for the subscriber's home 33, etc. Connection can be made and misidentification of wiring work is unlikely to occur.

[0003]

In the distribution mode as described above, since there is one route, there is a possibility that 8 cores will be disconnected together in the middle of the line. In such a case, optical transmission / reception is completely interrupted. Will end up. As a solution in this case, it is considered that the optical fiber is routed in a loop. That is, four cores are wired in two directions in a loop form from the station, and when the wires are to be withdrawn, the two directions are combined and withdrawn as eight cores (see FIG. 2). In this case, since there are two routes, even if one route is disconnected, transmission and reception can be performed using the other route.

However, in this case, it is necessary to once connect a pair of multi-core optical fibers (4 cores + 4 cores) to the distribution optical module in order to drop each 2 cores to each subscriber's house. Then, one core is selected from the four-core optical fibers from one direction, and one core is selected from the four-core optical fibers from the other direction corresponding to this, and the ferrule corresponding to one desired subscriber home is selected. Have to make a connection to. This is a complicated work that is likely to be mistaken and cannot be mechanically connected. Therefore, it is expected that the actual on-site work will be extremely troublesome work.

The present invention has been made in consideration of the above circumstances, and enables distribution of an optical fiber that enables mechanical connection of a multi-core optical fiber even with loop wiring and makes connection work extremely easy. The purpose is to provide an optical module.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pair of optical fiber arrays wired in a loop from an optical signal transmission / reception source to a transmission / reception terminal at an arbitrary position of the loop line. In an optical fiber distribution optical module for pulling down, a pair of optical fiber arrays led from both directions of a loop line are connected in a state of being superposed in two stages so that the ends of the corresponding pair of optical fibers are adjacent to each other. And a housing for accommodating the ferrule.

In this case, the ferrule has connecting pins or connecting holes for connection, and the connecting pins or connecting holes are provided in a plurality of rows in the vertical direction as a pair in the horizontal direction. It is preferable that each pair of adjacent optical fibers is connected to the pin or the connection hole, and that the optical fiber array is a tape-shaped multi-core optical fiber.

[0008]

The pair of optical fiber arrays are connected to the ferrule in a state of being superposed in two stages so that the ends of the corresponding pair of optical fibers are adjacent to each other. That is, one optical fiber array is simply connected to the ferrule along its array and similarly the other optical fiber array is simply connected to the ferrule along its array. With this connection, in the stacking direction orthogonal to the above-mentioned arrangement direction, the corresponding optical fibers are automatically paired in a plurality of rows in the above-mentioned arrangement direction without requiring any special operation.

In this case, the connecting pins or connecting holes for connecting the ferrules are arranged in pairs in the horizontal direction and are arranged in a plurality of rows in the vertical direction. Will be possible. If the optical fiber array is a tape-shaped multi-fiber optical fiber, the arrangement of the optical fibers can be made uniform.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the distributed optical module of the present invention. As shown in FIG. 2, the distributed optical module 1 according to the present embodiment includes a pair of tape-shaped four-core optical fibers 22 and 23 (optical fiber arrays) loop-connected from the station 21 to four subscriber homes. Since it is dropped to 24, 25, 26, 27, it is applied to the connecting portion 28 (broken line portion). Corresponding optical fiber A at connection site 28
1 and A2, B1 and B2, C1 and C2, D1 and D2 form a pair, and two cores are provided for each subscriber home 24, 25, 26, 27.
To be withdrawn. In this distribution mode, the four-core optical fiber 2
Lines 2 and 23 are wired in loops in two directions centering on the station 21.

As shown in FIG. 1, a distributed optical module 1 includes a housing 2 into which the respective four-core optical fibers 22 and 23 are inserted.
And four ferrules 3, 4, 5 and 6 assembled in the tip of the housing 2. The housing 2 is provided with an introduction tube 7 on the base end side (right end side in FIGS. 1A and 1C), and the 4-fibers 22 and 23 are introduced into the multi-core ferrule 8 of the introduction tube 7. , Each optical fiber 2
2, 23 are introduced in the form of a tape fiber by being stacked one above the other. In the housing 2, the four-fiber optical fibers 22 and 23 are separated from the multi-fiber ferrule 8 by one optical fiber, and the ends of the separated optical fibers correspond to the ferrules 3, 4, and 5. , 6 are connected. In this case, the four-core optical fibers 22 and 23 are superposed so that the corresponding optical fibers (for example, the optical fibers A1 and A2) are located one above the other, and are inserted into the multi-core ferrule 8. Fiber A1 and A
2, B1 and B2, C1 and C2, D1 and D2 are guided in the same direction at the upper and lower positions, and the corresponding ferrules 3,
Reach 4, 5, 6.

In FIGS. 1A and 1B, 9 is a guide plate mounted in the housing 2,
On the surface of the guide plate 9, one of the four-core optical fibers 2
Optical fibers A1, B1, C1, D1 separated from two
(C1 and D1 are not shown) are formed with guide grooves 9a to be arranged so as to draw a quadratic curve of maximum curvature. Also, although partially omitted in the figure, below the guide plate 9, the optical fibers A2, B2, C separated from the other four-core optical fiber 23 are provided.
A guide plate in which D2 and D2 are arranged under the same condition is incorporated. That is, the four-fibers 22 and 2 are vertically arranged.
The pair of guide plates 9 and 9 are incorporated with the pair of guide grooves 9a and 9a facing each other facing each other.

With such a configuration, the corresponding optical fibers (for example, A1 and A2) can be vertically aligned on the same path and guided to the ferrule (for example, 3). That is, the optical fibers A1 and A2 are guided to the ferrule 3, the optical fibers B1 and B2 are guided to the ferrule 4, the optical fibers C1 and C2 are guided to the ferrule 5, and the optical fibers D1 and D2 are guided to the ferrule 6, respectively. Each ferrule 3,4
Optical fibers A1 and A2, B1 and B are provided at 5 and 6, respectively.
2, the ends of C1 and C2, D1 and D2 are connected.

Then, these ferrules 3, 4, 5,
As shown in FIG. 1 (b), 6 is assembled in the housing 2 in a state of being aligned in the vertical direction, and the connection holes 3 a, 4 of the ferrules 3, 4, 5, 6 facing the end faces of the optical fibers.
The a, 5a, and 6a are arranged in four rows in the vertical direction with the horizontal direction (vertical direction) as a pair. Ferrule 3,
Optical fibers 4, 5 and 6 on the branch line side from subscriber homes 24, 25, 26 and 27 (see FIG. 2) are connected. The end of the optical fiber on the branch line side is connected to the withdrawing ferrules 10, 10, 10, and the withdrawing ferrules 10, 10, 10, 10 are ferrules 3, 4, 5 corresponding to the subscriber's house. , 6, the corresponding optical fibers can be connected to each other.

Therefore, in such a structure, since the corresponding optical fibers are adjacent to each other and the four-core optical fibers are superposed and connected to the ferrule, the connecting work can be mechanically performed, and the subscriber's house It can be reliably and extremely easily performed without mistake.

In the above embodiment, the withdrawals are distributed to four houses, but the number is not limited.

[0017]

As described above, according to the present invention, a pair of optical fiber arrays, which are looped so that corresponding optical fibers are adjacent to each other, are superposed and pulled down in an aligned state, so that a reliable connection without error can be achieved. It has an effect that it can be easily performed and the withdrawal work can be easily performed.

[Brief description of drawings]

FIG. 1 is a structural diagram of a distributed optical module according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a distribution mode of withdrawal by loop wiring.

FIG. 3 is an explanatory diagram showing a distribution mode of withdrawal by conventional wiring.

[Explanation of symbols]

 1 ... Distributed optical module 2 ... Housing 3 ... Ferrule 4 ... Ferrule 5 ... Ferrule 6 ... Ferrule 21 ... Station 22 ... 4-fiber optical fiber 23 ... 4-fiber optical fiber

Claims (3)

[Claims] 1. An optical fiber distribution optical module for dropping a pair of optical fiber arrays wired in a loop from an optical signal transmission / reception source to a transmission / reception terminal at an arbitrary position of the loop line, wherein the loop line And a housing in which the pair of optical fiber arrays, which are guided from both directions, are connected in a state of being superposed in two stages so that the ends of the corresponding pair of optical fibers are adjacent to each other. An optical fiber distributing optical module, comprising: 2. The ferrule has a connecting pin or a connecting hole for connection, and the connecting pin or the connecting hole is provided in a plurality of rows in the vertical direction as a pair in the horizontal direction. 2. The optical fiber distributing optical module according to claim 1, wherein the pair of adjacent optical fibers are connected to the connecting pin or the connecting hole. 3. An optical fiber distributing optical module according to claim 1, wherein the optical fiber array is a tape-shaped multi-core optical fiber.