JP6907866B2 - Optical connection structure and optical wiring member - Google Patents

Description

The present invention relates to an optical connection structure and an optical wiring member.

As an optical connection method for connecting optical fibers having different diameters, for example, as described in Patent Document 1, a method of spatially coupling optical fibers having different diameters is shown.

Japanese Unexamined Patent Publication No. 2013-171208

However, when the optical fibers are connected to each other by the method described in Patent Document 1, the connection loss may increase. In order to reduce the connection loss, it is conceivable to connect optical fibers of different diameters to each other by PC (Physical Contact), but if optical fibers of different diameters are simply connected to each other by PC, the connection between the two becomes insufficient. In some cases.

The present invention has been made in view of the above, and an object of the present invention is to provide an optical connection structure and an optical wiring member capable of stably connecting optical fibers having different diameters to a PC.

The invention of the present application is
It is an optical connection structure that connects the optical fibers included in the two optical connection components to a PC.
Including the first optical connection component and the second optical connection component,
The first optical connection component includes a first optical fiber and a first holding member that holds the first optical fiber.
The second optical connection component includes a second optical fiber and a second holding member that holds the second optical fiber.
The first holding member and the second holding member each have a front end surface and a rear end surface facing each other, and a fiber hole provided inside between the front end surface and the rear end surface, respectively.
The first optical fiber is introduced into the fiber hole of the first holding member from the rear end surface side, and the tip surface is formed from the opening of the end of the fiber hole on the front end surface of the first holding member. In the protruding state, it is adhesively fixed to the first holding member and fixed.
The second optical fiber is introduced into the fiber hole of the second holding member from the rear end surface side, and the tip surface is formed from the opening of the end of the fiber hole on the front end surface of the second holding member. In the protruding state, it is adhesively fixed to the second holding member and fixed.
The tip surface of the first optical fiber and the tip surface of the second optical fiber come into contact with each other.
The diameter of the first optical fiber is smaller than the diameter of the second optical fiber.
The curvature of the tip surface of the first optical fiber is smaller than the curvature of the tip surface of the second optical fiber, which is an optical connection structure.

According to the present invention, there is provided an optical connection structure and an optical wiring member capable of stably connecting optical fibers having different diameters to a PC.

It is an exploded perspective view of the optical connection component which concerns on one Embodiment of this invention. It is a figure which showed typically the cross section at the time of assembling the optical connection component. This is an example of application of an optical connection component to a router device. It is a figure explaining an optical connection structure. It is a figure explaining the tip surface of an optical fiber.

[Explanation of Embodiments of the Invention]
First, embodiments of the present invention will be listed and described.

(1) The optical connection structure of the present application is an optical connection structure for connecting an optical fiber included in two optical connection components to a PC, and includes a first optical connection component and a second optical connection component. The 1 optical connection component includes a first optical fiber and a first holding member that holds the first optical fiber, and the second optical connection component holds the second optical fiber and the second optical fiber. It has a second holding member, and the first holding member and the second holding member are provided inside between the front end surface and the rear end surface facing each other and the front end surface and the rear end surface, respectively. The first optical fiber is introduced into the fiber hole of the first holding member from the rear end surface side, and the fiber hole of the front end surface of the first holding member is provided. The second optical fiber is adhesively fixed to the first holding member in a state where the tip surface protrudes from the opening at the end of the second holding member, and the second optical fiber is introduced into the fiber hole of the second holding member from the rear end surface side. At the same time, the front end surface of the second holding member is adhesively fixed to the second holding member in a state where the tip surface protrudes from the opening of the end of the fiber hole, and the first optical fiber is formed. The tip surface and the tip surface of the second optical fiber are in contact with each other, the diameter of the first optical fiber is smaller than the diameter of the second optical fiber, and the curvature of the tip surface of the first optical fiber is the second. It is smaller than the curvature of the tip surface of the optical fiber.

In the optical connection structure according to the above embodiment, when the first optical fiber and the second optical fiber having different diameters are connected to each other by a PC, the curvature of the tip surface of the first optical fiber having a small diameter is adjusted to the curvature of the tip surface of the first optical fiber having a large diameter. By making it smaller than the curvature of the tip surface of the optical fiber, PC connection can be realized with a smaller pressing force. Therefore, even when the optical fibers having different diameters are connected to the PC, the retreat of the optical fiber caused by the elastic deformation of the adhesively fixed portion between the optical fiber and the holding member generated at the time of pressing can be suppressed, and the PC can be suppressed. A stable connection can be achieved.

(2) Further, in the present invention, in the optical connection structure described in (1) above, the curvature of the tip surface of the second optical fiber is 3 to 5 times the curvature of the tip surface of the first optical fiber. It can be an aspect of.

By establishing the above relationship between the curvature of the tip surface of the first optical fiber and the curvature of the tip surface of the second optical fiber, it is possible to realize PC connection between optical fibers with a small pressing force and it is derived from axial misalignment. An optical connection structure with reduced connection loss can be realized.

(3) Further, the present invention can have an aspect in which the diameter of the first optical fiber is 70 μm to 90 μm in the optical connection structure described in (1) and (2) above.

The optical connection structure according to the present invention can be suitably used when the diameter of the first optical fiber is 70 μm to 90 μm.

(4) Further, according to the present invention, in the optical connection structure described in (1) to (3) above, the first optical connection component has a plurality of the first optical fibers, and the plurality of first optical fibers are provided. The optical fiber constitutes a tape core wire, the first holding member is an MT ferrule that holds the tape core wire including the plurality of first optical fibers, and the second optical connection component is a plurality of the first. An embodiment having two optical fibers, the plurality of second optical fibers forming a tape core wire, and the second holding member being an MT ferrule that holds the tape core wire including the plurality of second optical fibers. Can be.

The optical connection structure according to the present invention can be suitably used even when the first connection component and the second connection component are tape core wires. That is, according to the above optical connection structure, it is possible to stably realize a PC connection for each optical fiber between two tape core wires composed of optical fibers having different diameters.

(5) The optical wiring member of the present application is an optical wiring member included in an apparatus having a plurality of the above-mentioned optical connection structures (1) to (4), and is a plurality of first elements included in the plurality of optical connection structures. It has an optical connection component and an optical wiring portion made of an optical fiber having the same diameter as that of the first optical fiber, which is optically connected to the plurality of first optical connection components.

According to the above-mentioned optical wiring member, since the optical wiring member includes an optical wiring portion made of an optical fiber having the same diameter as the first optical fiber having a smaller diameter, the optical wiring member can be miniaturized.

[Details of Embodiments of the present invention]
Specific examples of the optical connection structure according to 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 examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

FIG. 1 is an exploded perspective view of an optical connection component including an optical connection component used in the optical connection structure according to the embodiment of the present invention. Further, FIG. 2 is a diagram schematically showing a cross section when assembling the optical connection component. The optical connection structure according to the present embodiment is a structure in which the tip surfaces of the optical fibers included in the optical connection component are connected to each other by a PC (Physical Contact). In the following embodiments, first, the basic structure of the optical connection component will be described, and then the features of the optical connection structure according to the present embodiment will be described.

As shown in FIGS. 1 and 2, the optical connection component 1 includes a ferrule 10 as a holding member, a boot 20, and a tape core wire 30. The tape core wire 30 is realized as an aggregate of a plurality of optical fibers 31. The boot 20 may not be included in the optical connection component 1. Further, the aggregate of the optical fibers 31 may not be the tape core wire 30.

The ferrule 10 is a member for an optical connection component made of resin, and is, for example, an MT ferrule. The ferrule 10 has a front end surface 10a and a rear end surface 10b facing the front end surface 10a. Then, on the front end surface 10a side between the front end surface 10a and the rear end surface 10b, a plurality of fiber holes 11 into which the optical fibers included in the tape core wire 30 are inserted are provided at predetermined intervals (pitch). A boot insertion hole 12 into which the boot 20 is inserted is provided on the rear end surface 10b side. The plurality of fiber holes 11 communicate with the boot insertion holes 12.

The front end surface 10a of the ferrule 10 is provided with two guide pin holes 13 used when inserting the guide pins. Further, four fiber holes 11 are arranged between the two guide pin holes 13. The four fiber holes 11 are arranged on substantially the same plane and extend in parallel from the front end surface 10a toward the rear end surface 10b. The diameter of the fiber hole 11 is set corresponding to the optical fiber of the tape core wire 30 described later. Therefore, for example, when a small-diameter fiber having a diameter of 120 μm is used as the optical fiber of the tape core wire 30, the diameter of the fiber hole 11 is also set to 120 μm. Further, when a small diameter fiber having a diameter of 80 μm is used as the optical fiber of the tape core wire 30, the diameter of the fiber hole 11 is also set to 80 μm.

Further, as shown in FIG. 2, the interval (pitch) of the fiber holes 11 of the ferrule 10 is set to, for example, 250 μm. Each of the plurality of fiber holes 11 has an opening 11a in the front end surface 10a. The openings 11a are arranged in a line in a line, but the distance (pitch) between the adjacent openings 11a is 250 μm. Each of the plurality of fiber holes 11 also has an opening 11b on the boot insertion hole 12 side. Similar to the openings 11a, the openings 11b are also arranged in a line in a line, and the distance (pitch) between the adjacent openings 11b is 250 μm.

The ferrule 10 may be provided with a window communicating with the fiber hole 11 and the boot insertion hole 12 from the outside on a surface different from the front end surface 10a and the rear end surface 10b. This window can be used for aligning the optical fiber when manufacturing the optical connection component 1, introducing an adhesive, confirming fixing with the adhesive, and the like.

The boot 20 is a resin member for optical connection parts. The boot 20 has a first end surface 20a and a second end surface 20b facing the first end surface 20a. Then, a through hole 21 into which the tape core wire 30 is inserted is provided between the first end surface 20a and the second end surface 20b. The boot 20 is used to protect the tape core wire 30, and its shape is appropriately designed according to the shape of the tape core wire 30 and the like.

The tape core wire 30 includes a plurality of optical fibers 31 and a resin coating 32 (coating) for coating the optical fibers 31. The optical fibers 31 are lined up in a row along a direction intersecting the optical waveguide direction. In this embodiment, an example in which four optical fibers 31 are arranged in a row is shown. The resin coating 32 is a resin (tape material) that integrally covers a plurality of optical fibers 31. In FIG. 1 and the like, the resin coating 32 is provided around each of the plurality of optical fibers 31, but the resin coating 32 collectively covers the plurality of optical fibers 31 so that the surface becomes flat. It may be configured. With the resin coating 32, a plurality of optical fibers 31 can be integrated into a tape core wire 30. As the plurality of optical fibers 31, for example, a single-mode optical fiber can be used, but a multi-mode optical fiber may be used.

As shown in FIG. 2, the resin coating 32 at the tip of each optical fiber 31 of the tape core wire 30 has been removed. In this state, the boot 20 attached to the tape core wire 30 is inserted into the boot insertion hole 12 of the ferrule 10, and the optical fiber 31 (bare fiber) from which the resin coating 32 at the tip on the second end surface 20b side has been removed is inserted. Each is inserted into the fiber hole 11. Then, as shown in FIG. 2, the tip surface of each optical fiber 31 is in a state of protruding from the opening 11a of the fiber hole 11. As a result, the ferrule 10, the boot 20, and the tape core wire 30 are integrated. In this state, when a plurality of optical fibers 31, ferrule 10, boots 20, and tape core wire 30 are adhesively fixed using an adhesive or the like, the optical connection component 1 according to the present embodiment can be obtained.

The protruding length of the optical fiber 31 from the opening 11a is, for example, about several μm. Further, the tip surface of the optical fiber 31 is processed so that the curvature R is 1 mm or more.

FIG. 3 shows an example in which an optical connection structure including the optical connection component 1 is applied. In the optical connection structure according to the present embodiment, for example, the optical connection component 1 is used for a device having a wiring structure using an optical fiber such as a backplane (optical wiring board) such as a large-capacity router device or a server device. .. FIG. 3 schematically shows the periphery of the backplane in the router device. In the router device 100, a plurality of wiring boards 110 are connected to the backplane 120 (optical wiring board) via optical connection components 1 and 2. The optical connection component 1 is an optical connection component on the backplane 120 side, and the optical connection component 2 is an optical connection component on the wiring board 110 side. The structure of the ferrule in the optical connection component 2 is the same as that of the ferrule 10 in the optical connection component 1. In FIG. 3, the optical connection components 1 and 2 are separated from each other, but they are connected to realize the optical connection structure 7.

An optical wiring unit 5 optically connected to the optical connection component 1 via an optical fiber is connected to the backplane 120. The optical wiring unit 5 is provided with optical fiber wiring for connecting the wiring board 110 to another wiring board, other equipment, or the like. The optical fiber used for the optical wiring unit 5 has the same diameter as the optical fiber used for the optical connection component 1. The backplane 120, the plurality of optical connection components 1, and the optical wiring unit 5 constitute the optical wiring member 130 according to the present embodiment. The backplane 120 may not be included in the optical wiring member 130.

Generally, in an electronic device such as a router device 100, the space in which the optical wiring member 130 including the backplane 120 is housed is often required to be miniaturized. Therefore, instead of the conventional tape core wire using an optical fiber (for example, glass diameter 125 μm), the optical wiring portion 5 is configured by a tape core wire using a recently developed small diameter fiber (for example, glass diameter 80 μm). However, it is being considered to handle it. By configuring the optical wiring unit 5 using an optical fiber having a smaller diameter, the optical wiring unit 5 can be miniaturized, and the optical wiring member 130 as a whole can be miniaturized.

When a small-diameter fiber is used in the optical wiring portion 5 included in the optical wiring member 130, the optical fiber 31 (see FIG. 2) protruding from the opening 11a of the front end surface 10a of the ferrule 10 constituting the optical connection component 1 Naturally, it is a small diameter fiber.

On the other hand, on the wiring board 110 side, a conventional optical fiber having a glass diameter (diameter) is often used. Therefore, the optical fiber 31 (see FIG. 2) protruding from the opening 11a of the front end surface 10a of the ferrule 10 constituting the optical connection component 2 is a conventional optical fiber.

FIG. 4 is a diagram showing a connection portion between the optical connection component 1 and the optical connection component 2, that is, an optical connection structure according to the present embodiment. The optical connection structure 7 includes two optical connection components, an optical connection component 1 as a first optical connection component and an optical connection component 2 as a second optical connection component. In the following description, in order to distinguish between the optical connection component 1 (first optical connection component) and the optical connection component 2 (second optical connection component), as shown in FIG. The first holding member), the boot 201, and the optical fiber 311 (the first optical fiber) are included, and the optical connection component 2 includes the ferrule 102 (the second holding member), the boot 202, and the optical fiber 312 (the optical fiber 312). The second optical fiber) is included.

In the optical connection component 1, the tip surface 311a of the optical fiber 311 projects from the opening 111a of the fiber hole 111 provided in the front end surface 101a of the ferrule 101. On the other hand, in the optical connection component 2, the tip surface 312a of the optical fiber 312 protrudes from the opening 112a of the fiber hole 112 provided in the front end surface 102a of the ferrule 102. Then, the optical connection structure 7 is formed by connecting the tip surface 311a of the optical fiber 311 (particularly the core region of the optical fiber) and the tip surface 312a of the optical fiber 312 (particularly the core region of the optical fiber) to a PC. can get. When connecting to a PC, both are pushed in a direction in which the optical fiber 311 and the optical fiber 312 are brought close to each other, and the tip surface 311a of the optical fiber 311 and the tip surface 312a of the optical fiber 312 are brought into contact with each other and pressed. The force at which this pushing is performed is called pushing pressure. When the optical fibers 311, 312 are pressed, the tip surfaces of the optical fibers 311, 312 are deformed, and the two are connected by adhering in a state where the contact area between the two is increased. As a result, both can be connected in a state where no air gap is generated between the tip surfaces of the optical fibers 311, 312.

However, as described above, it is assumed that the optical fiber 311 and the optical fiber 312 have different diameters from each other. In the example shown in FIG. 4, the diameter of the optical fiber 311 is smaller than the diameter of the optical fiber 312. Therefore, optical fibers 311, 312 having different diameters are connected to the PC. In this way, when optical fibers 311, 312 having different diameters are connected to a PC, it may be difficult to realize a stable PC connection as compared with the PC connection between optical fibers having the same diameter.

First, in the PC connection between optical fibers of the same diameter, when pressing two optical fibers against each other, a force (drag) opposite to the pressing force along the optical axis direction of the optical fiber corresponding to the pressing force. Is applied to both of the two optical fibers. The adhesive fixing the optical fiber to the ferrule is elastically deformed by the force along the optical axis direction. Therefore, the optical fiber recedes with respect to the ferrule (moves in the direction in which the two optical fibers are separated from each other). However, in the PC connection, since the force for pushing the optical fiber is controlled in consideration of the retreat of the optical fiber, the connection between the optical fibers becomes stable.

On the other hand, when optical fibers having different diameters are butted against each other, the stability of the PC connection with the optical fiber of the other party is affected by the optical fiber on the side where the area of the bonding region is small and the diameter is small. That is, depending on the diameter of the optical fiber having the smaller diameter, it is considered that the adhesive strength of the optical fiber at the time of PC connection is smaller than that of the conventional optical fiber connection. Further, the optical fiber having the smaller diameter is easily affected by a force (drag) opposite to the pressing force along the optical axis direction of the optical fiber generated when the two optical fibers are butted against each other. That is, when the diameter is small, the force applied to the side surface of the optical fiber (the force applied per unit area) becomes large. Therefore, the elastic deformation of the adhesive fixing the optical fiber to the ferrule becomes larger than that of the optical fiber having a large diameter, and the optical fiber having a small diameter tends to recede with respect to the ferrule. As a result, the PC connection between the optical fibers becomes unstable, and in some cases, the optical fibers may be separated from each other (PC disconnection may occur).

Therefore, in the optical connection structure 7 according to the present embodiment, when optical fibers 311, 312 having different diameters are connected to a PC, the shape of the tip surface thereof is adjusted to improve the stability of the PC connection. Specifically, the curvature (R) of the tip surface of the optical fiber having a small diameter is smaller than the curvature of the tip surface of the optical fiber having a large diameter.

As shown in FIG. 5A, the curvature of the tip surface 311a of the optical fiber 311 on the smaller diameter side of the optical connection structure 7 is R1, and the curvature of the tip surface 312a of the optical fiber 312 on the larger diameter side is R1. When R2 is set, the relationship of R1 <R2 is satisfied. With such a configuration, when the optical fibers 311, 312 are pressed to connect to a PC, the tip surface 311a of the optical fiber 311 having a small diameter and a small curvature has a large curvature as compared with the case where the optical fiber 311a has a large curvature. Deformation becomes faster. That is, since the front end surface 311a of the optical fiber 311 is deformed when the pressing force is small, the PC connection can be realized when the pressing force is small. When the pressing force is small, the force (drag) in the direction opposite to the pressing force applied to the side surfaces of the optical fibers 311, 312 along the optical axis direction becomes small, so the force applied to the side surfaces of the optical fibers 311, 312 should also be reduced. Can be done. That is, the retreat of the optical fibers 311, 312 can be suppressed. Therefore, among the optical fibers 311, 312, the retreat of the optical fiber 311 on the side having a particularly small diameter can be suppressed, so that the PC connection of the optical fibers 311, 312 can be prevented from becoming unstable.

As described above, in the optical connection structure 7 according to the present embodiment, when the optical fibers 311, 312 having different diameters are connected to the PC, the curvature (R1) of the tip surface 311a of the optical fiber 311 having a small diameter is changed. By making the curvature (R2) of the tip surface 312a of the large optical fiber 312 smaller, PC connection can be realized with a smaller pressing force. Therefore, even when the optical fibers having different diameters are connected to the PC, the retreat of the optical fiber caused by the elastic deformation of the adhesively fixed portion between the optical fiber and the holding member generated at the time of pressing can be suppressed, and the PC can be suppressed. A stable connection can be achieved.

The relationship between the curvature of the tip surface and the PC connection in two optical fibers having different diameters will be further described. FIG. 5B shows a case where the tip surface 311a of the optical fiber 311 and the tip surface 312a of the optical fiber 312 have the same curvature. FIG. 5B shows a state in which the curvatures of the optical fibers 311, 312 are relatively large. In such a case, since both the tip surfaces 311a and 312a of the optical fibers 311, 312 have a relatively flat shape, a large pressing force is required to realize a PC connection with the tip surface deformed. Become. In that case, since the drag force corresponding to the pressing force also increases, as described above, the force applied to the side surfaces of the optical fibers 311, 312 (particularly the optical fiber 311 on the smaller diameter side) increases, and the optical fibers 311, 312 become larger. The amount of retreat increases. Therefore, it is possible that the PC connection becomes unstable.

On the other hand, as in FIG. 5B, the tip surface 311a of the optical fiber 311 and the tip surface 312a of the optical fiber 312 have the same curvature, but the curvature can be made relatively small. In such a case, since both the tip surfaces 311a and 312a of the optical fibers 311, 312 have a relatively sharp shape, the tip surface is easily deformed. Therefore, the pressing force for realizing the PC connection becomes small. Therefore, the drag force corresponding to the pressing force is also reduced, and as described above, the amount of retreat of the optical fibers 311, 312 (particularly the optical fiber 311 on the smaller diameter side) is reduced. However, if both tip surfaces are sharp, misalignment is likely to occur. Therefore, the connection loss may increase between the optical fibers 311, 312 after the PC connection.

On the other hand, in the optical connection structure 7 according to the present embodiment, when the optical fibers 311, 312 having different diameters are connected to a PC, the curvature (R) of the tip surface 311a of the optical fiber 311 having a small diameter is changed to the diameter. Is smaller than the curvature (R) of the tip surface 312a of the optical fiber 312 having a large value. As a result, as compared with the case where the curvature of the tip surface of both optical fibers is reduced, the axial deviation at the time of connecting the optical fibers can be suppressed, and the increase in the connection loss can be prevented. In addition, since the PC can be connected with a small pressing force as compared with the case where the curvature of the tip surface of both optical fibers is increased, the retreat of the optical fiber can be suppressed and a stable PC connection can be realized. Can be done.

In the optical connection structure 7, how to set the curvature (R1) of the tip surface 311a of the optical fiber 311 having a small diameter and the curvature (R2) of the tip surface 312a of the optical fiber 312 having a large diameter is determined by the optical fiber. It can be appropriately designed according to the thickness of 311, 312. Both the curvature R1 and the curvature R2 are set to 1 mm or more. If the curvatures R1 and R2 are made smaller than 1 mm, it may not be possible to properly connect the two optical fibers to the PC. Further, the curvature R1 and the curvature R2 preferably have R2 / R1 in the range of 3 to 5. That is, the curvature R2 is preferably in the range of 3 to 5 times the curvature R1. By setting the curvatures R1 and R2 in the above relationship, it is possible to realize a PC connection with a small pressing force and an optical connection structure in which the connection loss due to the misalignment is reduced.

As described in the above embodiment, the optical connection structure 7 according to the present embodiment is suitably used for connecting a conventionally used optical fiber having a diameter of 125 μm and a small diameter fiber having a diameter of about 80 μm. Be done. That is, the optical fiber 311 preferably has a diameter in the range of 70 μm to 90 μm. As described above, in a device such as a server device to which the optical connection structure 7 is applied, a small diameter fiber is used in the optical connection component 1 constituting the optical wiring member 130, and the optical connection component 2 on the wiring board 110 side is It is conceivable that a conventional optical fiber having a diameter of 125 μm is used. The optical connection structure 7 according to the present embodiment can be suitably used for the above-mentioned device.

Further, in the above embodiment, the optical fiber 311 and the optical fiber 312 used in the optical connection structure 7 are both optical fibers included in the tape core wire, and the optical fiber 311 and the optical fiber 312 are ferrules 101 and 102, respectively. The case of (MT ferrule) has been described. As described above, the optical connection structure 7 is preferably used when a plurality of optical fibers included in the tape core wire are connected to each other by a PC using the MT ferrule. In the case of multi-core, the protruding length of each optical fiber from the opening varies slightly. When two optical connectors having different protrusion lengths are connected to a PC, the optical fiber having the largest protrusion length comes into contact first, and the optical fiber having the smallest protrusion length comes into contact later. Therefore, if the curvature of the tip surface of a small-diameter optical fiber is large, the tip surface is difficult to deform, and a large pressing force is required to deform the tip surface. It greatly affects the elastic deformation, and there is a risk that the PC connection will become unstable. Therefore, if the curvature of the tip surface of the optical fiber with the smaller diameter is reduced, the tip surface can be greatly deformed with a small pressing force. Only pressing pressure is applied. Therefore, by reducing the curvature of the tip surface of the optical fiber having the smaller diameter, it is possible to mitigate the influence of variations in the protrusion lengths of the plurality of optical fibers. In addition, the pressing force required for PC connection of the entire plurality of optical fibers can be reduced. That is, according to the optical connection structure according to the present embodiment, it is possible to stably realize PC connection of each of a plurality of optical fibers of two tape core wires composed of optical fibers having different diameters. For the sake of brevity, the case of a 4-core tape core wire and a 4-core MT ferrule has been shown as an example, but the number of optical fibers and the number of fiber holes are not limited to this.

Further, the optical wiring member 130 according to the present embodiment is an optical wiring member included in the device having a plurality of optical connection structures 7 described in the above embodiment, and is a plurality of first elements included in the plurality of optical connection structures 7. It has an optical connection component 1 as an optical connection component, and an optical wiring unit 5 made of an optical fiber having the same diameter as the optical fiber included in the optical connection component 1, which is optically connected to a plurality of optical connection components 1. .. According to such an optical wiring member 130, in the above-described embodiment, which is a first optical fiber having a smaller diameter, the optical wiring member 130 includes an optical wiring portion 5 made of an optical fiber having the same diameter as the optical fiber 311. Therefore, the optical wiring member can be miniaturized.

Although the optical connection structure and the optical wiring member according to the embodiment of the present invention have been described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, the optical connection component attached to the tape core wire has been described, but the optical connection structure according to the present invention can also be applied to the case where the aggregate of optical fibers is not the tape core wire. Further, in the above embodiment, the case where the holding member is an MT ferrule has been described, but the holding member may have a structure different from that of the MT ferrule.

1,2 ... Optical connection parts, 5 ... Optical wiring parts, 10,101,102 ... Ferrules, 10a ... Front end face, 10b ... Rear end face, 11 ... Fiber hole, 11a, 11b ... Opening, 12 ... Boot insertion hole, 20 ... Boots, 20a ... 1st end face, 20b ... 2nd end face, 21 ... Through hole, 30 ... Tape core wire, 31,311,312 ... Optical fiber, 32 ... Resin coating, 100 ... Router device, 110 ... Wiring board , 120 ... back plane, 130 ... optical wiring member.

Claims (4)

A single optical fibers contained in each of the two optical connecting parts and an optical connecting structure for PC connection,
Including the first optical connection component and the second optical connection component,
The first optical connection component includes a first optical fiber and a first holding member that holds the first optical fiber.
The second optical connection component includes a second optical fiber and a second holding member that holds the second optical fiber.
The first holding member and the second holding member each have a front end surface and a rear end surface facing each other, and a fiber hole provided inside between the front end surface and the rear end surface, respectively.
The first optical fiber is introduced into the fiber hole of the first holding member from the rear end surface side, and the tip surface is formed from the opening of the end of the fiber hole on the front end surface of the first holding member. In the protruding state, it is adhesively fixed to the first holding member and fixed.
The second optical fiber is introduced into the fiber hole of the second holding member from the rear end surface side, and the tip surface is formed from the opening of the end of the fiber hole on the front end surface of the second holding member. In the protruding state, it is adhesively fixed to the second holding member and fixed.
A core region of the distal end surface of the core region of the distal end surface of the first optical fiber and said second optical fiber abuts,
The diameter of the first optical fiber is smaller than the diameter of the second optical fiber.
An optical connection structure in which the curvature of the tip surface of the second optical fiber is 3 to 5 times the curvature of the tip surface of the first optical fiber. The optical connection structure according to claim 1, wherein the diameter of the first optical fiber is 70 μm to 90 μm. The first optical connection component has a plurality of the first optical fibers, and the plurality of first optical fibers constitute a tape core wire.
The first holding member is an MT ferrule that holds a tape core wire including the plurality of first optical fibers.
The second optical connection component has a plurality of the second optical fibers, and the plurality of second optical fibers constitute a tape core wire.
The optical connection structure according to claim 1 or 2 , wherein the second holding member is an MT ferrule that holds a tape core wire including the plurality of second optical fibers. An optical wiring member included in an apparatus having a plurality of optical connection structures according to any one of claims 1 to 3.
A plurality of first optical connection components included in the plurality of optical connection structures,
An optical wiring portion made of an optical fiber having the same diameter as that of the first optical fiber, which is optically connected to the plurality of first optical connection components.
An optical wiring member having.

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