JP6620043B2 - Leaky light receiving structure - Google Patents

Description

  The present invention relates to an optical fiber connection technique in optical communication.

  Several methods have been proposed for connecting optical fibers. For example, there is a method in which the tips of optical fibers are made into connectors and the connectors are connected to each other. Also, there is a fusion splicing using melting the tip of the optical fiber and melting the glass. The optical fiber connection developed so far is effective, for example, when constructing a new optical line such as when providing a service in the future. On the other hand, since the service is provided for the already constructed line, the conventional optical fiber connection has a demerit that stops the service because it is necessary to cut the line. Therefore, a technology for connecting optical fibers without stopping service is required.

  As a new optical fiber connection form, we are considering a connection technology in which an optical fiber is bent and a probe is disposed in the vicinity of the bent portion. This technique is a technique for concentrating a signal leaking from a bent portion with a probe without gently losing the signal by gently bending the optical fiber (Non-patent Document 1).

“Examination of optical fiber side output technology for communication optical monitoring at the upper part of the 8-branch splitter” Uematsu, IEICE Technical Report, vol. 115, no. 202, OFT2015-22, pp. 35-38, 2015 August.

  As described above, it has been confirmed that leakage light can be received by combining the bending shape and the probe, and an appropriate probe fixing technique for the bending fiber is desired.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to provide a leakage light receiving structure capable of receiving a leakage light by appropriately fixing a probe to a bending fiber. is there.

  In order to achieve the above object, the leakage light receiving structure of the present invention is as follows.

  (1) The leakage light receiving structure according to the present invention includes a concave block, a convex block having a convex portion corresponding to the concave portion of the concave block, and light leaked from an optical fiber sandwiched and bent by the concave portion and the convex portion. And a protection block for fixing the tip of the probe toward the optical fiber pressed against the recess and protecting the probe.

  (2) In the leakage light receiving structure of (1) above, the convex block and the protective block are bonded and fixed.

  (3) In the leakage light receiving structure according to (2), the tip of the protection block bonded to the fixing position of the concave block has a convex shape that protects the tip of the probe, and the concave block is fixed. The position is a concave shape corresponding to the convex shape, and the convex shape and the concave shape are fitted and bonded and fixed.

  (4) In the leakage light receiving structure according to (2), the tip of the protection block bonded to the fixed position of the concave block has a convex hemispherical shape that protects the tip of the probe, and the concave block The fixing position is a concave hemispherical shape corresponding to the convex hemispherical shape, and the convex hemispherical shape and the concave hemispherical shape are fitted and fixed.

  (5) In the leakage light receiving structure according to (3) above, the concave portion of the concave block has a concave hemispherical shape, and the arc surface of the concave hemispherical shape has a through hole, and the fixed position of the concave block is The concave shape is a through path to the through hole.

  (6) In the leakage light receiving structure of (5) above, an arc formed by the tip of the protective block and the tip of the probe corresponds to the shape of the through hole.

  According to the present invention, it is possible to provide a leakage light receiving structure capable of appropriately fixing a probe to a bending fiber and receiving leakage light.

  (1) According to the leakage light receiving structure of the present invention, the optical fiber is sandwiched and bent between the concave portion of the concave block and the convex portion (surface) of the convex block, and is protected by the protective block (light receiving portion). Is fixed toward the bent portion of the optical fiber. Thereby, it is possible to reliably receive the leaked light by the probe.

  (2) Further, according to the leakage light receiving structure of the present invention, since the convex block and the protection block are bonded and fixed, the shake of the probe protected by the protection block can be prevented, and the probe reliably Light leakage can be received.

  (3) Further, according to the leakage light receiving structure of the present invention, the convex shape that protects the tip of the probe and the concave shape provided in the concave block are fitted and fixed. This facilitates positioning of the probe tip and shortens the probe adjustment time.

  (4) Further, according to the leakage light receiving structure of the present invention, the convex hemispherical shape that protects the tip of the probe and the concave hemispherical shape provided in the concave block are fitted and fixed. This facilitates positioning of the probe tip and shortens the probe adjustment time.

  (5) Further, according to the leakage light receiving structure of the present invention, the protection block is inserted through the through path, and the tip of the protection block (tip of the probe) is directly or indirectly transmitted through the through hole. Since the fiber reaches the bent portion, the probe can receive light leaked from the bent portion without optical loss.

  (6) Further, according to the leakage light receiving structure of the present invention, the arc formed by the tip of the protection block and the tip of the probe corresponds to the shape (arc) of the through hole. Since the tip of the protection block (tip of the probe) reaches the bent portion of the optical fiber directly or indirectly, the probe can receive light leaked from the bent portion without optical loss.

It is a figure which shows an example of the bending formation of an optical fiber by the insertion of the uneven | corrugated block which concerns on 1st Embodiment. It is a figure which shows an example of the groove | channel of the concave block inner surface which concerns on 1st Embodiment. It is a figure which shows an example of the insertion of the optical fiber by the uneven | corrugated block which concerns on 1st Embodiment. It is a conceptual diagram for demonstrating the leakage light from the bending part of the optical fiber which concerns on 1st Embodiment. It is a figure which shows an example of the leak light receiving structure which fixed the front-end | tip (light-receiving part) of the probe toward the bending part of the optical fiber which concerns on 1st Embodiment. The figure which shows an example of the leak light reception structure which fixed the front-end | tip of the probe toward the bending part of the optical fiber which concerns on 1st Embodiment, and also shows the distance of the bending part (bending part vertex) of an optical fiber, and a probe It is. It is a figure which shows an example of the leak light reception structure which fixed the front-end | tip of the probe toward the bending part of the optical fiber which concerns on 2nd Embodiment. It is a figure which shows an example of the leak light reception structure which fixed the front-end | tip of the probe toward the bending part of the optical fiber which concerns on 3rd Embodiment. It is a figure for demonstrating the factor which degrades an optical characteristic. It is a figure which shows an example of the leak light-receiving structure which fixed the front-end | tip of the probe toward the bending part of the optical fiber which concerns on 4th Embodiment. It is a figure which shows an example of the leak light reception structure which fixed the front-end | tip of the probe toward the bending part of the optical fiber which concerns on 5th Embodiment.

  Each embodiment will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an example of bending of an optical fiber by sandwiching an uneven block according to the first embodiment. FIG. 1A shows a state before the optical fiber is bent, and FIG. 1B shows a state after the optical fiber is bent.

  As shown in FIGS. 1A and 1B, the optical fiber 3 is bent by sandwiching the optical fiber 3 between the convex block 1 and the concave block 2. That is, the optical fiber 3 is bent by sandwiching the optical fiber 3 between the convex portion at the tip of the convex block 1 and the concave portion (U-shaped groove 21) of the concave block 2.

  FIG. 2 is a diagram illustrating an example of a groove on the inner surface of the concave block according to the first embodiment. 2A is a bird's-eye view of the concave block, and FIG. 2B is a cross-sectional view of the concave block.

  As shown in FIGS. 2A and 2B, a groove 21 is formed inside the concave block 2 and the optical fiber 3 is bent by pushing the optical fiber 3 into the groove 21 by the convex block 1. It is done.

  FIG. 3 is a diagram illustrating an example of the optical fiber sandwiched by the concavo-convex block according to the first embodiment. 3A shows a state before the optical fiber is sandwiched between the convex block 1 and the concave block 2, and FIG. 3B shows the state after the optical fiber is sandwiched between the convex block 1 and the concave block 2. FIG. Indicates the state.

  That is, the optical fiber 3 is bent by being sandwiched between the convex block 1 and the concave block 2 along the groove 21 of the concave block 2.

  FIG. 4 is a conceptual diagram for explaining leakage light from the bent portion of the optical fiber according to the first embodiment. 4A is a bird's-eye view, and FIG. 4B is a cross-sectional view thereof.

  As shown in FIG. 4 (a), the communication light 31 is inserted from one side of the optical fiber 3, and as shown in FIGS. 4 (a) and 4 (b), the bending portion (bending portion) of the optical fiber 3 is inserted. Communication light leaks from the optical fiber 3 to the outside of the optical fiber 3. This is defined as leakage light 32. In order to receive the leaked light 32, a probe is disposed in the vicinity of the leaked light 32. Thereby, the leakage light 32 from the bent part of the optical fiber 3 can be received by the probe. However, since the probe is thin and low in strength, if the probe is bonded and fixed to the concave block 2 as it is, the probe may be broken.

  FIG. 5 is a diagram illustrating an example of a leaky light receiving structure in which the tip (light receiving unit) of the probe is fixed toward the bent portion of the optical fiber according to the first embodiment. FIG. 5A is a bird's-eye view, and FIG. 5B is a cross-sectional view thereof.

  As shown in FIGS. 5A and 5B, for example, the protection block 4 incorporates a probe 5 and protects the built-in probe 5. For example, the protection block 4 is made of a member such as plastic. . Adhesive or the like is applied to the tip 41 of the protection block 4, that is, the tip 51 of the probe 5, and the concave block 2 and the probe 5 are bonded and fixed to constitute a leakage light receiving structure. In other words, the protection block 4 (tip 51 of the probe 5) and the concave block 2 are fixed via the adhesive layer 6.

  In this way, the optical fiber 3 is sandwiched between the convex block 1 and the concave block 2 to create a situation where leakage light 32 is generated, and the leakage light 32 is probed most while finely adjusting the protective block 4 incorporating the probe 5. The probe 5 is stopped at a position where light can be received by 5 and fixed with an adhesive.

  FIG. 6 shows an example of a leaky light receiving structure in which the tip of the probe is fixed toward the bent portion of the optical fiber according to the first embodiment, and the bent portion (bend portion apex) of the optical fiber is connected to the probe. It is a figure which shows distance. FIG. 6A is a bird's-eye view, and FIG. 6B is a cross-sectional view thereof.

  As shown in FIGS. 6A and 6B, the leakage light receiving structure includes a convex block 1, a concave block 2, a probe 5, and a protection block 4, and the convex block 1 and the concave block 2 are used. By sandwiching the optical fiber 3, the optical fiber 3 is bent, and the leaked light of the optical fiber 3 leaking from the bent portion is received by the probe 5. The protection block 4 fixes the tip 41 of the probe 5 toward the optical fiber 3 pressed against the concave portion of the concave block 2.

  For example, as a type of adhesive constituting the adhesive layer 6, there is a UV adhesive. Apply UV adhesive to the end face (tip 41) of the protection block 4 in advance, stop the movement of the protection block 4 containing the probe 5 at the position (fixed position) where the leaked light 32 can be received most, and turn on the UV light source. By irradiating, the adhesive is cured and the concave block 2 and the protection block 4 are integrated. That is, the distance d between the bent portion (vertex) of the optical fiber 3 and the probe 5 can be sufficiently shortened to connect the concave block 2 and the protection block 4, thereby forming a leakage light receiving structure.

(Second Embodiment)
In the first embodiment, the leakage light receiving structure configured by connecting the surface (fixed position) of the concave block 2 and the surface (end surface) of the protection block 4 incorporating the probe 5 has been described. In the first embodiment, the X, Y, and Z axes can be adjusted. The connection in the bending of the optical fiber 3 of the present embodiment can omit the axis.

  FIG. 7 is a diagram illustrating an example of a leaky light receiving structure in which the tip of the probe is fixed toward the bent portion of the optical fiber according to the second embodiment. When the optical fiber 3 is bent, the leakage position is uniquely determined. The position can be grasped beforehand by measuring the distribution of leakage.

  The protection block 4 a that protects the probe 5 has a convex shape 42 a that protects the tip 51 of the probe 5. That is, the tip of the protection block 4a is sharpened, for example, in a convex shape. For example, the surface of the tip 41a of the protection block 4a and the surface of the tip 51 of the probe 5 are the same plane.

  The fixed position of one concave block 2a has a concave shape 22a. That is, one side of the concave block 2a has a concave shape.

  The convex shape 42a and the concave shape 22a are corresponding shapes, and the convex shape 42a and the concave shape 22a are fitted and bonded and fixed. Thus, although both the convex shape 42a and the concave shape 22a are combined, it is set as the form by which the probe 5 is arrange | positioned in the position which can receive the leakage light 32 of the optical fiber 3 most. For example, a UV adhesive is applied to the side surface of the protection block 4a in advance, and the protection block 4a is fixed when the leakage light 32 is received at the maximum. That is, when the leaked light 32 is received at the maximum, UV light is irradiated from the outside, and the concave block 2a and the protection block 4a are bonded and fixed.

  Furthermore, since the moving direction of the probe 5 is only the Z axis, it is not necessary to adjust the three axes as shown in the first embodiment, and only one axis is adjusted, leading to a reduction in probe adjustment time. .

(Third embodiment)
In the second embodiment, the convex shape 42a and the concave shape 22a have been described as an example. An effect can be obtained.

  FIG. 8 is a diagram illustrating an example of a leaky light receiving structure in which the tip of the probe is fixed toward the bent portion of the optical fiber according to the third embodiment. When the optical fiber 3 is bent, the leakage position is uniquely determined. The position can be grasped beforehand by measuring the distribution of leakage.

  The protection block 4 b that protects the probe 5 has a convex hemispherical shape 42 b that protects the tip 51 of the probe 5. That is, the front end portion of the protection block 4b has a convex hemispherical shape, for example. For example, the arc of the tip 41b of the protection block 4b and the arc of the tip 51 of the probe 5 are on the same arc surface.

  The fixed position of one concave block 2b has a concave hemispherical shape 22b. That is, one side of the concave block 2b has a concave shape in the concave hemisphere.

  The convex hemispherical shape 42b and the concave hemispherical shape 22b are the corresponding shapes, and the convex hemispherical shape 42b and the concave hemispherical shape 22b are fitted and fixed. Thus, although both the convex hemispherical shape 42b and the concave hemispherical shape 22b are combined, the probe 5 is arranged at a position where the leakage light 32 of the optical fiber 3 can be received most. For example, a UV adhesive is applied to the side surface of the protection block 4b in advance, and the protection block 4b is fixed when the leakage light 32 is received at the maximum. That is, when the leakage light 32 is received at the maximum, UV light is irradiated from the outside, and the concave block 2b and the protection block 4b are bonded and fixed.

(Fourth embodiment)
By further improving the structure described in the first, second, and third embodiments, the optical characteristics can be improved.

  FIG. 9 is a diagram for explaining factors that degrade optical characteristics. The leaked light 32 from the optical fiber 3 passes through the concave block 2 a, reaches the tip (end face) 51 of the probe 5, and passes through the probe 5. Here, if the transmission region of the concave block 2a can be eliminated, optical loss can be eliminated in the process of propagating through the concave block 2a. Therefore, the optical characteristics can be improved by reviewing the configuration of the concave block 2a.

  FIG. 10 is a diagram illustrating an example of a leaky light receiving structure in which the tip of the probe is fixed toward the bent portion of the optical fiber according to the fourth embodiment. The leakage light receiving structure sandwiches the optical fiber 3 between the convex block 1 and the groove (concave hemispherical shape) 21c of the concave block 2c. Further, a part (bottom part) of the arc surface of the groove 21c of the concave block 2c is cut in advance to form the through hole 22c. Moreover, let the concave shape of the fixed position of the concave block 2c be the penetration path 23c to the through-hole 22c. The leakage light receiving structure includes a convex protection block 4c that protects the probe 5, and the protection block 4c can be inserted into the through path 23c. The concave block 2c and the protective block 4c are bonded and fixed by inserting the protective block 4c whose side surface is coated with an adhesive into the through passage 23c.

(Fifth embodiment)
FIG. 11 is a diagram illustrating an example of a leaky light receiving structure in which the tip of the probe is fixed toward the bent portion of the optical fiber according to the fifth embodiment.

  As shown in FIG. 11, a part (bottom part) of the arc surface of the groove 21d of the concave block 2d is cut in advance to form a through hole 22d. The concave shape of the fixed position of the concave block 2d is defined as a through path 23d to the through hole 22d. The leakage light receiving structure includes a convex protection block 4d that protects the probe 5d, and the protection block 4d can be inserted into the through path 23d. The concave block 2d and the protective block 4d are bonded and fixed by inserting the protective block 4d whose side surface is coated with an adhesive into the through passage 23d. The arc formed by the tip 41d of the protection block 4d and the tip 51d of the probe 5d corresponds to the shape (arc) of the through hole 22d.

  Thereby, a part of the curved surface of the groove 21d of the concave block 2d and the curved surface of the tip 41d of the protection block 4d incorporating the probe 5d are matched, and the both can be fixed without causing a step, and the structure with the same curved surface It can be a body.

  First, by sandwiching the optical fiber 3 between the convex block 1 and the concave block 2d, the optical fiber 3 is bent, a bent portion is formed in the optical fiber 3, and the communication light 31 is inserted from one side of the optical fiber. Next, the protection block 4d containing the probe 5d is inserted. As a result, the leakage light receiving structure of the present embodiment has a structure in which the probe 5d directly receives the leakage light 32 from the bent portion of the optical fiber 3.

  Note that a UV adhesive is applied in advance to the side surface of the protective block 4d, and the protective block 4d is fixed when the leakage light 32 is received at the maximum. That is, when the leakage light 32 is received at the maximum, UV light is irradiated from the outside, and the concave block 2d and the protection block 4d are bonded and fixed.

  According to the first to fifth embodiments described above, communication light can be received from an optical line facility constructed while providing a service. Since the built optical line is not cut, it is possible to continue to provide services to customers.

  In addition, various modifications can be made without departing from the scope of the present invention.

In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.
Hereinafter, the invention described in the scope of claims at the beginning of the application of the present application will be added.
[C1]
A concave block,
A convex block having a convex portion corresponding to the concave portion of the concave block;
A probe for receiving leakage light from the optical fiber bent and sandwiched between the concave portion and the convex portion;
While fixing the tip of the probe toward the optical fiber pressed against the recess, a protective block for protecting the probe;
A leaky light receiving structure comprising:
[C2]
The leakage light receiving structure according to [C1], wherein the convex block and the protective block are bonded and fixed.
[C3]
The tip of the protection block bonded to the fixed position of the concave block is a convex shape that protects the tip of the probe,
The fixed position of the concave block is a concave shape corresponding to the convex shape,
The leakage light receiving structure according to [C2], wherein the convex shape and the concave shape are fitted and fixed by adhesion.
[C4]
The tip of the protection block bonded to the fixed position of the concave block has a convex hemispherical shape that protects the tip of the probe;
The fixing position of the concave block is a concave hemispherical shape corresponding to the convex hemispherical shape, and the convex hemispherical shape and the concave hemispherical shape are fitted and fixed by bonding [C2] 2. Leakage light receiving structure.
[C5]
The concave portion of the concave block has a concave hemispherical shape,
The concave hemispherical arc surface has a through hole;
[C3] The leakage light receiving structure according to [C3], wherein the concave shape at the fixed position of the concave block is a through path to the through hole.
[C6]
[C5] The leakage light receiving structure according to [C5], wherein an arc formed by the tip of the protection block and the tip of the probe corresponds to the shape of the through hole.

DESCRIPTION OF SYMBOLS 1 ... Convex block, 2 ... Concave block, 21, 21a, 21b, 21c, 21d ... Groove, 22a ... Concave shape, 22b ... Concave hemispherical shape, 22c, 22d ... Through hole, 23c, 23d ... Through passage, 3 ... Optical fiber, 31 ... communication light, 32 ... leakage light, 4, 4a, 4b, 4c, 4d ... protection block, 41, 41a, 41b, 41c, 41d ... tip, 42a ... convex shape, 5, 5d ... probe, 51 51d ... tip, 6 ... adhesive layer

Claims (2)

A concave block having a groove ;
A convex block having a convex portion corresponding to the concave portion of the concave block;
A probe for receiving leakage light from the optical fiber bent and sandwiched between the concave portion and the convex portion;
While fixing the tip of the probe toward the optical fiber pressed against the recess, a protective block for protecting the probe;
With
The concave block has a through path into which the protective block is inserted,
Forming a through hole to the through path on a partially curved surface of the groove of the concave block;
The leakage light receiving structure according to claim 1, wherein a curved surface formed by the tip of the protection block and the tip of the probe coincides with a partial curved surface of the groove of the concave block.   The leak light receiving structure according to claim 1, wherein the concave block and the protective block are bonded and fixed.