JPS5880609A - Connecting method of optical fiber core wire - Google Patents

Abstract

PURPOSE:To elevate tensile strength remarkably, by making a part which has formed an optical fiber strand and its covering layer as one body, in a terminal part of an optical fibe core wire, covering a strand connecting part by a connecting sleeve, and connecting it. CONSTITUTION:A part 15 formed as one body is formed by exposing a strand 2, coating layer 8 and buffer layer 4, of an optical fiber core wire 1, and a connecting part of the optical fiber stand 2, supporting body 19 and spacer 20 are fitted. Subsequently, a connecting sleeve 16 inserted in advance is moved to the connecting part, and caulking 17 is executed. When tension is put on both ends Y, Y' of this connecting part, stress is shifted to the sleeve 16 through the part 15 formed as one body, and as a result, overall tensile strength of the connecting part of the optical fiber core wire 1 can be elevated remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an original phi/Z
This relates to the connection method of ILslfiJ.

Figure 1 shows - of the original fiber core wire (1) that is the object of the present invention.
It is a sectional view showing an example. In Figure 1, (2) is the original fiber wire made of original transmission glass, (3) is the baked modified silicon coating layer, (4) H silicone rubber buffer layer, (5)
) is a plastic (nylon) jacket. Fig. 2 (&) (b) (c) shows an example of the connection of the fiber core (1) shown in Fig. 1, Fig. 2 (a) is a plan view with the lid removed, and Fig. 2 (b) (C) is a side view with a lid, and (C) is a sectional view of the central part (AA') with a lid.

(6) is a grooved reinforcing member (made of plastic, ceramics, FRP, etc.) for housing the original fiber core wire and optical fiber element, (C is the lid, (8) Ild adhesive, (9) H) This is the connection (welding or butt) of the original fiber strands.If a tension of F is applied to the X and X' ends of such a connection, in most cases, the In the range indicated by R, the glass fiber is exposed and breaks at the foot.The value is approximately 0.2 to 2 to 9, compared to the value of the original optical fiber core (2 to 8.Kt). This poses an extremely large problem in ensuring the reliability of optical communication lines.

As described above, the reasons why the tensile strength of the original fiber core deteriorates significantly at the spliced part are that (a) minute scratches are made on the surface of the glass when exposing the optical fiber at the spliced part; ) When welding the end faces of the original fiber strands, the glass material deteriorates due to heat; (c) between the members that make up the original fiber core (jacket (5)
- Buffer layer (4) - Baked coating layer (3) - Original fiber wire (
This may be because the friction between 2) and 2) is relatively low.

In order to avoid such problems, connection methods such as those shown in FIGS. 3 and 4 have been proposed. In Figures 3 and 4 (1
0) u metal pipe, Ql) is a heat shrink tube (2) is a heat-melting adhesive, (to) is an extra length of the original fiber wire, and a4 is a coiled extra length of the original fiber core wire. In the structure shown in FIG. 3, in order to form a bent part in a bare optical fiber, a predetermined part of the original fiber is damaged, and its strength is inevitably deteriorated, so there is a risk of breakage and it is not practical.

Furthermore, although the method shown in FIG. 4 is effective against elongation, it is not suitable for practical use because there is no measure to improve the retention force, so it is less effective in improving the tensile strength. The basic problem with the above-mentioned drawback is that there is no mechanical integration of the optical fiber and the coating layer either at the optical fiber itself or at the connection point. Therefore, it is necessary to solve this problem first before configuring the connection part, but in conventional bonding methods, such measures are not considered at all, so it is necessary to ensure the tensile strength required for practical purposes. I was unable to do so.

An object of the present invention is to provide a novel method for connecting original fiber cores, which eliminates the drawbacks of the prior art described above and makes it possible to significantly improve tensile strength.

In other words, the gist of the present invention is to create a mechanically integrated part of the coating layer (plastic jacket, buffer layer, etc.) of the optical fiber at the end of the optical fiber to be connected, and to connect the optical fiber. After the connection is protected, the strand connecting portion is covered with a connecting sleeve, and the mechanically integrated portion and the connecting sleeve are connected to form a connecting portion of the original fiber core wire.

The inventive structure will be specifically explained with reference to drawings showing embodiments.

In Figure 5-, (1) is the original fiber core, (5) is its plastic jacket, (G) is the mechanically integrated part of the optical fiber and its coating layer, and α is the metal connection. Sleeve, Qη is the crimped part and the integrated part α with d leap α.
Connect 0. (to) is the extra length of the optical fiber core (with jacket or buffer layer), a is the support for the original fiber connection part, and the spacer is used to connect the support Q'J to the connection sleeve Q. Separate yourself. This connection is assembled as follows. First, the exposed strands of the optical fiber core wire are exposed, and after the mechanically integrated portion 00 is created, the original fiber strands are connected and the support body α and the spacer (e) are attached.

Next, the connecting sleeve αQ, which has been inserted in advance, is moved to the connecting portion and crimped αη is performed to complete the connection. When tension is applied to both ends Y and Y' of this connection, the stress is transferred to the sleeve α through the integrated part α, and as a result, the overall tension of the optical fiber connection is Strength is greatly improved.

In this case, the extra length Q@ is not necessarily necessary as long as the integrated portion has a perfect zero uniformity. However, there is a coating and it deteriorates (7)
y Providing an appropriate extra length (c) for the original fiber improves the safety of splicing optical fiber wires that are damaged and have reduced tension (1) The mechanical integration part (g) may have This is an effective book for improving the reliability of connections by absorbing slight slips (between the fiber strands and the coating layer) and temperature expansion and contraction of the connection sleeve. Note that the connection between the integrated portions M is not necessarily limited to caulking of the metal sleeve, and it is also possible to fix the U-shaped member using adhesive or screws.

6 to 10 are examples of a mechanically integrated portion DI of an optical fiber wire and its coating layer.

In FIG. 6, (1) to (5) are the same as shown in FIG. The elastic tube @ made of anFi rubber etc. has a metallic collar (E) and (C) which are hexagonal or cylindrical caulked parts.

To assemble this, K opens the optical fiber (1) as shown in the figure, inserts the elastic material cheep I21) from the end side as shown in the figure, covers it with the collar (B), From one turn of the collar wire, caulking @(c) is performed to complete the work of creating a mechanically integrated part of the original fiber wire (2), especially the buffer layer (4), and the coating layer, especially the jacket (5).

Naorishime ■ is intended to integrate the jacket (nylon) (5) and collar (A), and caulking (C) is to integrate the collar wire and optical fiber wire (2), but the caulking wire is crimped. If the force is excessive, the nylon jacket may undergo significant buckling deformation, which may cause microoids in the fiber strand and cause a harmful increase in loss, so it is important to select an appropriate crimp force. desirable.

Such an integrated portion can significantly improve the pulling force (retaining force) of the optical fiber strand (2) with respect to the collar (A).

In FIG. 7, (1) to (5) are the same as shown in FIG. (C) is an elastic tube, (C) is a caulking, 184 is a metal collar with different diameters on the left and right sides, (C) is a heat-melting adhesive, and @ is a heat-shrinkable tube. To assemble this, open the optical fiber as shown in the figure, insert the elastic tube, and insert the collar (E), which was previously passed through the original fiber, into the elastic tube 21. Then, wrap the tape of plastic heat welding adhesive (E) over the collar (C) and jacket (5) as shown in the diagram, cover it with a heat shrink tube, and then Heat shrink and integrate the heat shrink tube (goods) and collar jumper jacket (5) by gluing.

Such a structure makes it possible to significantly increase the drawing force of the optical fiber strand (2) for collar action.

FIG. 8(&) is a perspective view of a still different integrated part, and FIGS. 8(b) and 8(c) are explanatory diagrams of a fixing metal fitting which is a component.

In FIG. 8(a), (1), (2), and (5) are the same as shown in FIG. (to) is a wrapped optical fiber fixing metal fitting, @ is a metal fitting fixing sleeve, and... is a wrapped optical fiber core wire. (28-1) The dividing member of the H fixing bracket @, (28-2) the dividing member to be combined with (2J-1), (2B-3) the small cylindrical projection (2B -4) V-shaped groove for storing H optical fiber core wire, (28-5) is a storage recess of the cylindrical projection (28-3). To assemble this integrated part structure, the original shear fiber core wire (1) is wound around the cylindrical small protrusion (28-3) JKjK1 using the split member (28-1).

Both sides of the fiber core are stored in the grooves (28-4), adhesive is applied between the fiber core wire and the member, and the dividing member (28-2) is attached to this.
, groove (28-4), protrusion (28-3) and recess (2B-
5). Next, the metal fitting fixing sleeve is placed over the wrapped optical fiber fixing metal fitting (to) which has been overlapped to form a cylindrical shape, and the optical fiber core (1) and the fixing metal fitting are crimped into a cylindrical shape with a sleeve roller. @,
The fixing sleeve 4 is integrated. This method is shown in Figures 6 and 7.
Unlike the illustration, the friction is increased by wrapping it around.

Although the loss due to winding increases slightly, it has the characteristic that the most stable retaining force can be obtained.

FIG. 9(a) is a perspective view of a still different integrated part, and FIGS. 9(b) and 9(c) are explanatory diagrams of a fixing fitting that is a component thereof.

FIG. 9(a) With VCk n, (1) and (2) (5) are the same as those shown in FIG. 4 is the metal fitting fixing sleeve;
(, 31) The U curved optical fiber fixing fitting (62) is an optical fiber core wire formed in a wave shape. 11-1)(!
12-2) is a half cylinder that is a component of the fixing fitting (32), and (31-, 5) (Sl-4) is a storage groove for the optical fiber core. To assemble this integrated part, insert the original fiber core wire (1) into the groove (61-1) of the half-split cylinder (?1l-1).
1*, fill the gap between the core wire (1) and the half cylinder (!1l-1) with adhesive, and place the groove (31-3) and the groove (3
1-4) match, the half cylinder (31-1) and (
31-2) are superimposed. Thereafter, the original fiber core (1), the curved optical fiber fixing fitting (31), and the fitting fixing sleeve 4 are integrated by inserting it into the fitting fixing sleeve and crimping it into a cylindrical shape with a sleeve roller. . This is a method that takes advantage of the increase in frictional force caused by deformation.

FIG. 10(a) is a perspective view of a still different integrated part, and FIG. 10(b) is an explanatory diagram of a fixing fitting that is a component thereof. In Figure 10 (a) (1) (2) (5)
is the same as shown in FIG. @Bracket fixing sleeve, (33) H spiral type optical fiber fixing bracket 13-
1) is a spirally carved optical fiber receiving groove, and (34) is a spiral optical fiber formed along the groove (3!;-1).

To assemble this integrated part structure, optical fiber core wire (1
) in the groove (3) of the spiral optical fiber fixing bracket (33).
5-1), fill the adhesive member along the groove,
Next, insert the metal fitting fixing sleeve 4 and press the metal fitting fixing sleeve into a cylindrical shape using a sleeve roller to fix the original fiber core (1), the spiral optical fiber fixing metal fitting (33), and the metal fitting. Integrate the sleeve.

This method aims at an effect intermediate between that of FIGS. 8 and 9.

Note that the methods shown in FIGS. 8 to 10 all involve an increase in loss due to bending, so it is desirable to select the method in consideration of allowable loss, dimensions, tensile strength, etc. of the connection portion.

As explained below, in the present invention, two
At the end of the optical fiber core wire, the optical fiber element
After creating a mechanically integrated part of the optical fiber and its coating layer (rubber, plastic), connecting the fibers to each other, and protecting this with a support, connect the optical fibers to the integrated part. from the outside with a connecting sleeve,
It can be significantly improved compared to an integrated system.

Further, by providing an extra length between the mechanically integrated part and the original fiber wire connection part using the coated original fiber, a connection part with higher reliability and strength can be obtained. In addition, the specific structure of the mechanically integrated part is simple and suitable for field work using ordinary parts and tools.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of an optical fiber core wire to which the present invention is applied, and Figs. 2 to 4 are a plan view, a side view, a cross-sectional view, and an explanatory view showing conventional connection methods. 5 is an explanatory diagram showing one embodiment of the present invention, and FIGS. 6 to 10 are
The figures are a perspective view and an explanatory view showing five examples of the mechanically integrated part in the optical fiber core connection method shown in FIG. 5. DESCRIPTION OF SYMBOLS 1: Optical fiber core wire, 2: Optical fiber bare wire, 4: Buffer layer, 5 Nibrush stick jacket, 6: Grooved reinforcing member, 8
: Adhesive material, 13: Extra length of optical fiber, 14: Coiled extra length of optical fiber, 15: Mechanical integration of optical fiber and its coating layer, 16: Connection sleeve , 17: Caulking, 18: Excess length of original fiber core wire, 19: Support body for connecting portion of original fiber wire, 20 Varnish spacer - 121: Elastic body tube, 22: Collar, 23.24
: Caulking, 28-fold winding original fiber fixing fitting, 31: Curved optical fiber fixing fitting, 36: Spiral optical fiber fixing fitting. Sai l Ro2 m (Cn (&1) (A-h'ttrrmrn) 3 B Su 4 Sword T5 (D 〒 6/FJ 7″7EJ Su θ m 2El-+ 211-4-9 m Procedural amendment form hemp) Display of the incident 1982 Patent Application No. 17849 Tsuba
Name of the person correcting the optical fiber connection method (5123 Hitachi Cable Co., Ltd. Agent Address: io. Address: 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Figures 1 and 2 of the drawings subject to amendment) Figures 2 and 3. Contents of the amendment Figures 1, 2, and 3 of the drawings are corrected as shown in the attached sheet. Attached document list of attached documents (Figures 1, 2, and 6) 1 copy that's all

Claims (1)

[Scope of Claims] 1. Remove the coating from the end of the original fiber core wire to be connected to connect the fiber optic fiber, and then insert the original fiber in front of the vaginal opening part. A mechanically integrated part of the strand and its coating layer is created, the original fiber strands are connected to each other, the connecting part is protected with a support to create an optical fiber strand connection part, and a connecting sleeve etc. , covering the above with the original fiber strain connection part and the mechanical integration part;
A method for connecting original fiber cores, comprising connecting an end of the sleeve or the like to a mechanically integrated part. 2. Item 1, characterized in that an extra length is provided between the optical fiber connecting part and the mechanically integrated part of the original fiber core, using the original fiber coated with a plastic jacket or a buffer layer. How to connect the original fiber core described. 3. At the mechanically integrated part created on the terminal side of the optical fiber core wire to be connected, the plastic jacket, buffer layer, and original fiber wire are opened in this order, and a plastic jacket is covered with an elastic tube. A first method characterized in that the collar, the jacket and the original fiber are mechanically integrated by caulking from the outer periphery.
How to connect optical fibers as described in Section 1. 4. At the mechanically integrated part created on the terminal side of the optical fiber core wire to be connected, the plastic jacket, the buffer layer, and the original fiber wire are opened in this order, and the buffer layer part is covered with an elastic tube. A metal collar is placed over the tube, and the collar is caulked from the outer periphery to mechanically integrate the collar and the original fiber wire, and one end of the collar that will not be crimped and the glass jacket are bonded with a hot melt adhesive. 2. The method for connecting original fiber cores according to item 1, characterized in that they are joined together using a heat-shrinkable tube. 5. A small cylindrical protrusion smaller than the diameter of the cylindrical member is provided in the middle of the split surface on one side of the half-split cylindrical member so that its axis is perpendicular to the split surface, and also in the middle of the split surface of the other member. is provided with a recessed portion for accommodating the cylindrical small protrusion, and an optical fiber core storage groove is provided in the divided surface of the half-split cylindrical member from both end faces in parallel to the axis thereof, and the cylindrical small protrusion is inserted into the cylindrical small protrusion. The optical fiber core is introduced into the input end groove of the half-split cylindrical metal fitting by using a wrapped optical fiber fixing metal fitting that connects up to four parts, and a metal fitting fixing sleeve that wraps and fixes the cylindrical metal fitting from the outer periphery. It is wrapped around three small cylindrical protrusions, placed in the groove on the opposite side, and pulled out from the other end surface. Using a combination of mechanical pressure and adhesive, the semi-cylindrical fitting, the fitting fixing sleeve and the original fiber core are assembled. 2. The method for connecting an optical fiber core according to claim 1, wherein the optical fiber core wire is integrated with the wire. 6. In the mechanically integrated part created on the end side of the optical fiber core wire to be connected, a smooth curved groove is provided on the dividing surface of the half-split cylindrical member to accommodate the original fiber core wire. Using a curved optical fiber fixing fitting and a fitting fixing sleeve that engages with the fitting, the optical fiber core wire is placed in the groove, and the optical fiber is fixed by the pressure of the adhesive and the fitting fixing sleeve. The method for connecting an optical fiber core according to item 1, characterized in that the core wire, a curved optical fiber fixing fitting, and a metal fitting fixing sleeve are integrated.Z Created on the terminal side of the original fiber core to be connected. In the mechanical integration part, a spiral optical fiber fixing fitting provided with a tHC spiral groove on the outer surface of the cylindrical member;
Using a metal fitting fixing sleeve that engages with this, the original fiber core is placed along the spiral groove, and the original fiber is connected to the spiral optical fiber fitting and the metal fitting by the pressure of the adhesive and the metal fitting fixing sleeve. The method for connecting original fiber cores according to item 1, characterized in that a fixing sleeve is integrated.