JP6633851B2 - Optical fiber cable with connector - Google Patents

Description

  The present invention relates to an optical fiber core with a connector.

  As a standard of a multi-core optical fiber connector, for example, a standard disclosed in Non-Patent Document 1 is known. In the above standard, the number, arrangement pitch, and the like of a plurality of fiber holes arranged in parallel in a multi-core optical fiber connector are defined (see FIG. 5 on page 597 in Non-Patent Document 1).

JIS C5982 F13 type multi-core optical fiber connector Japanese Industrial Standard

  When using a multi-core optical fiber connector defined by standards such as Non-Patent Document 1, all optical fibers are inserted into all fiber holes and used. However, not all optical fibers are necessarily used as communication lines, and only some of the optical fibers may be used depending on the use form. For example, a cable of 12 optical fibers (for example, 12 optical fiber cores) is connected to a 12-fiber connector, and four (four central, etc.) optical fibers are not used, and other fibers are used. In some cases, only eight optical fibers were used for communication.

In such a case, a configuration in which an optical fiber that is not used as a communication line is not inserted into the connector is also conceivable. For example, the cable connected to the 12-fiber connector may be a cable using eight optical fibers (for example, eight-fiber optical fiber), and in this case, the cost of the cable can be reduced.
However, in a configuration in which an optical fiber that is not used as a communication line as described above is not inserted into the connector, a bent portion of the optical fiber occurs in the connector before the optical fiber to be used is inserted into the boot and inserted into the fiber hole. If a curved portion having an excessive curvature occurs, a problem such as deterioration of transmission characteristics may occur.

  Therefore, an object of the present invention is to provide an optical fiber core with a connector in which even if only a part of the fiber hole in the connector is used, a bent portion of the optical fiber does not occur in the connector. .

An optical fiber with a connector according to one embodiment of the present invention, an optical fiber with a plurality of integrated optical fibers,
A connector holding the plurality of optical fibers included in the optical fiber core,
The connector has a connector body and a boot attached to an optical fiber insertion port of the connector body,
The connector body is formed with a plurality of fiber holes arranged in at least one row,
The boot has a plurality of insertion holes,
The optical fiber core is branched at one end side to be a plurality of branch cores and inserted through the plurality of insertion holes, respectively.
The plurality of insertion holes are formed in a shape that regulates the inner shape thereof so that the arrangement pitch of the optical fibers included in the inserted branch core and the arrangement pitch of the plurality of fiber holes are equal. ,
The ends of the plurality of branch cores are separated into single-core optical fibers, respectively, and the single-core optical fibers are respectively inserted into the plurality of fiber holes,
The tips of the plurality of optical fibers inserted into the plurality of fiber holes are arranged in a plurality of groups corresponding to the plurality of branch cores in at least one row of the array on the end surface of the connector body. I have.

  ADVANTAGE OF THE INVENTION According to this invention, even if it uses only some fiber holes in a connector, the optical fiber core with a connector which does not produce the bent part of an optical fiber in a connector can be provided.

It is the perspective view which looked at the connector part of the optical fiber core wire with a connector concerning this embodiment from the back in the penetration direction of the branch core wire. FIG. 2 is a perspective view of the optical fiber with connector of FIG. 1 cut at the center in the thickness direction along the insertion direction of the branch core; FIGS. 2A and 2B are views showing a boot of the optical fiber with connector shown in FIG. 1, wherein FIG. 1A is a plan view as viewed from above, FIG. 2B is a front view as viewed from a distal end inserted into the connector body, and FIG. FIG. 4D is a rear view as viewed from the rear end side, and FIG. FIG. 2 is a plan view of a distal end surface of a connector main body of the optical fiber with connector of FIG. 1.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.
The optical fiber with connector according to the embodiment of the present invention,
(1) an optical fiber core in which a plurality of optical fibers are integrated;
A connector holding the plurality of optical fibers included in the optical fiber core,
The connector has a connector body and a boot attached to an optical fiber insertion port of the connector body,
The connector body is formed with a plurality of fiber holes arranged in at least one row,
The boot has a plurality of insertion holes,
The optical fiber core is branched at one end side to be a plurality of branch cores and inserted through the plurality of insertion holes, respectively.
The plurality of insertion holes are formed in a shape that regulates the inner shape thereof so that the arrangement pitch of the optical fibers included in the inserted branch core and the arrangement pitch of the plurality of fiber holes are equal. ,
The ends of the plurality of branch cores are separated into single-core optical fibers, respectively, and the single-core optical fibers are respectively inserted into the plurality of fiber holes,
The tips of the plurality of optical fibers inserted into the plurality of fiber holes are arranged in a plurality of groups corresponding to the plurality of branch cores in at least one row of the array on the end surface of the connector body. I have.

  In the optical fiber cable with connector of the above (1), the boot has a plurality of insertion holes, and the inner shape is determined by the arrangement pitch of the optical fibers included in the inserted branch fiber and the fiber of the connector body. It is formed in a shape that regulates the arrangement pitch of the holes to be equal. Further, on the distal end surface of the connector body, the distal ends of the optical fibers are arranged in a plurality of groups corresponding to a plurality of branch cores. Thus, the optical fibers can be inserted into the fiber holes without bending the optical fibers at the respective branch core wires, while preventing the optical fibers from being inserted into the fiber holes between the groups. Therefore, even when only some of the fiber holes (fiber holes corresponding to each group) in the connector are used, it is possible to provide an optical fiber core with a connector in which the bent portion of the optical fiber does not occur in the connector. .

[Details of Embodiment of the Present Invention]
A specific example of the optical fiber with connector according to the embodiment of the present invention will be described below with reference to the drawings.
It should be noted that the present invention is not limited to these exemplifications, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

  FIG. 1 is a perspective view of the connector portion of the optical fiber with connector 1 according to the present embodiment as viewed from the rear in the insertion direction of the branch cores 10A and 10B. FIG. 2 is a perspective view of the optical fiber with connector 1 of FIG. 1 cut at the center in the thickness direction along the insertion direction of the branch fibers 10A and 10B.

  The optical fiber with connector 1 according to the present embodiment includes an optical fiber 10 and a connector 20 as shown in FIGS. 1 and 2.

  The optical fiber 10 is an optical fiber in which a plurality of optical fibers are integrated. For example, as shown in FIG. 1 and FIG. 2, the optical fiber core 10 has eight optical fibers 11 a to 11 h arranged in parallel and integrated, and is branched at one end to a plurality (for example, two ) Branch cores 10A and 10B. In the example shown in FIGS. 1 and 2, the branch optical fiber 10A is a four-core optical fiber, in which the optical fibers 11a to 11d and the optical fiber 10B are the optical fibers 11e to 11h, respectively.

  The connector 20 has a connector main body 21 and a boot 30 mounted on an optical fiber insertion opening 22 formed to be open at the rear end of the connector main body 21.

  The connector body 21 is a multi-core connector (for example, a 12-core connector disclosed in Non-Patent Document 1) having the optical fiber insertion port 22, a plurality of fiber holes 23, and guide pin holes 24. is there. The fiber holes 23 are arranged in at least one line. In the example shown in FIGS. 1 and 2, for example, twelve fiber holes 23 are formed at an arrangement pitch specified by the standard disclosed in Non-Patent Document 1. Have been. In addition, a window 25 for injecting an adhesive is opened in the upper surface of the connector main body 21. After inserting the optical fiber, the optical fiber can be fixed in the connector main body 21 by injecting an adhesive from the window 25 and hardening the same.

  3A and 3B are views showing the boot 30, wherein FIG. 3A is a plan view seen from above, FIG. 3B is a front view seen from the front end inserted into the connector main body 21, and FIG. FIG. 4D is a side view as viewed from the side in the insertion direction into the connector main body 21.

The boot 30 shown in FIG. 3 is used by being attached to the optical fiber insertion port 22 of the connector body 21 as shown in FIGS.
The boot 30 has a plurality of insertion holes 31 and 32 through which an optical fiber is inserted. In the example of FIGS. 1 and 2, the branch core 10A branched from the optical fiber 10 is inserted into the insertion hole 31 and the branch core 10. 10B are inserted into the insertion holes 32, respectively.
By inserting the optical fiber cores (branch cores 10A and 10B) into the insertion holes 31 and 32 in this manner, the optical fibers (11a to 11h) at the connection portion near the optical fiber insertion port 22 are protected. The boot 30 prevents the optical fibers (branch wires 10A, 10B) from being excessively bent near the rear end of the connector body 21.

  The plurality of insertion holes 31 and 32 have an inner shape corresponding to the arrangement pitch of the optical fibers 11 a to 11 d and the optical fibers 11 e to 11 h included in the inserted branch cores 10 </ b> A and 10 </ b> B and the number of the fiber holes 23. It is formed in a shape that regulates the arrangement pitch to be equal.

  In the example shown in FIGS. 1 to 3, the insertion holes 31 and 32 are formed separately on both sides of the connector body 21 in the arrangement direction of the fiber holes 23. The ends of the branch cords 10A and 10B inserted into the insertion holes 31 and 32 are separated into single-core optical fibers 11a to 11d and 11e to 11h, respectively, and are formed in the connector body 21 in the arrangement direction. Are respectively inserted into the four fiber holes 23 from both ends.

  As described above, since the arrangement pitch of the optical fiber and the fiber hole 23 is equal, the positions of the tips of the optical fibers 11a to 11d and 11e to 11h and the position of the fiber hole 23 are substantially the same in the arrangement direction of the optical fibers. The optical fibers 11a to 11d and 11e to 11h are inserted near the entrance of the fiber hole 23 without any bent portions.

FIG. 4 is a plan view of the distal end surface 26 of the connector main body 21.
As shown in FIG. 4, the distal ends of the plurality of optical fibers 11 a to 11 d and 11 e to 11 h inserted into the plurality of fiber holes 23 are connected to a plurality of branch cores in at least one row in the distal end surface 26 of the connector main body 21. A plurality of groups A (optical fibers 11a to 11d) and a group B (optical fibers 11e to 11h) corresponding to the lines 10A and 10B are arranged separately.

  Of the fiber holes 23 arranged in a line shown in FIG. 4, the four group of optical fibers 11a to 11d are inserted into four fiber holes 23 from one end and four fibers from the other end. The optical fibers 11e to 11h of the B group are inserted through the fiber holes 23, and no optical fibers are inserted through the four fiber holes 23 at the center.

  For example, a transceiver module or the like may use four communication lines for transmission and four communication lines for reception in some cases. If the optical fiber core with a connector 1 according to the present embodiment is used, for example, The optical fibers 11a to 11d can be used as communication lines for transmission, and the optical fibers 11e to 11h of the group B can be used as communication lines for reception.

  As described in detail above, according to the optical fiber with connector 1 according to the present embodiment, the optical fibers (11a to 11d, 11e to 11h) and the position of the fiber hole 23 are substantially the same in the arrangement direction of the optical fibers. Thereby, the optical fibers (11a to 11d, 11e to 11h) can be inserted near the entrance of the fiber hole 23 without forming a bent portion.

Further, the optical fibers (11a to 11d, 11e to 11h) are bent at the respective branch cords 10A and 10B so that the optical fibers are not inserted into the fiber holes 23 between the groups (A and B). The fiber can be inserted through the fiber hole 23 without any need. Therefore, even when only a part of the fiber holes 23 in the connector 20 (the fiber holes 23 corresponding to the groups (A, B)) are used, the optical fibers (11a to 11d, 11e to 11e) in the connector 20 are used. 11h), it is possible to provide the optical fiber with connector 1 in which the bent portion does not occur.
Thus, for example, even if the cable connected to the 12-fiber connector is replaced by an 8-fiber optical fiber cable in order to reduce the cost of the cable, the transmission characteristics can be prevented from deteriorating.

  In the above example, the eight optical fiber cores are branched at one end into two four-core optical fibers, but in addition, each of the eight optical fiber cores may include a single optical fiber. The optical fiber may be branched at one end side so as to be a book optical fiber and divided into a plurality of groups, or the optical fiber cores may be integrated again for each group. Alternatively, an optical fiber obtained by dividing an 8-core optical fiber into four branch optical fibers is divided into two groups and inserted into a boot having two insertion holes. These are divided into four groups and four insertions are performed. For example, the branch cords may be divided into three or more groups, such as being inserted into a boot having holes, or may be inserted into a boot having three or more insertion holes. Also, the number of groups and the number of insertion holes need not be the same. The number of optical fibers included in each group may not be the same.

DESCRIPTION OF SYMBOLS 1 Optical fiber core wire with a connector 10 Optical fiber core wire 10A, 10B Branch core wire 11a-11h Optical fiber 20 Connector 21 Connector main body 22 Optical fiber insertion port 23 Fiber hole 24 Guide pin hole 25 Window 26 Tip surface 30 Boots 31, 32 Insertion hole

Claims (1)

A plurality of optical fibers are arranged in a row and an integrated optical fiber core,
A connector holding the plurality of optical fibers included in the optical fiber core,
The connector has a connector body and a boot attached to an optical fiber insertion port of the connector body,
The connector body is formed with a plurality of fiber holes arranged in a line,
The boot has a plurality of insertion holes,
The optical fiber core wire is branched at one end side and is inserted into the plurality of insertion holes as a plurality of branch core wires outside the connector ,
The plurality of insertion holes are formed in a shape that regulates the inner shape thereof so that the arrangement pitch of the optical fibers included in the inserted branch core and the arrangement pitch of the plurality of fiber holes are equal. ,
The ends of the plurality of branch cores are separated into single-core optical fibers, respectively, and the single-core optical fibers are respectively provided in a part of the plurality of fiber holes without being bent inside the connector. Penetrated,
The distal ends of the plurality of optical fibers inserted into a part of the plurality of fiber holes are divided into a plurality of groups corresponding to the plurality of branch cores in a single-line arrangement on the distal end surface of the connector body. Arranged
Fiber holes between the adjacent groups, the single-core optical fiber is not inserted,
Optical fiber cable with connector.

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