JP2003066265A - Optical fiber cable connecting method and connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber cable connecting method and connection structure in which the connecting part can be finished with a short length and in which waterproofing of the connecting part is simple. SOLUTION: This optical fiber cable connecting method and the connecting part are characterized by an optical fiber holder A in which a shallow groove 2 is cut for fitting a coated optical fiber 1 and in which a deep groove 5 is cut for continuing to the shallow groove 2 and for fitting an optical fiber cable 3 or a spliced part protective sleeve 4. By this optical fiber holder, there are held simultaneously the coated optical fiber 1 and the optical fiber cable 3 or the spliced part protective sleeve 4. As a result, the connecting part L is finished with a short length and stored in a protective cover B filled with a water resistant gel 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to an optical fiber cable.
The present invention relates to a bull connecting method and a structure of a connecting portion.

[0002]

2. Description of the Related Art Optical fiber cable splicing methods are roughly classified into two types, a mechanical splicing method and a fusion splicing method. In the mechanical splicing method, an optical fiber cable 3 is used as shown in FIG. As shown in FIG. 5, the optical fiber core wire 1 from which the coating is removed is held only by the fiber holder A ′ having only the shallow groove 2 into which the optical fiber core wire 1 is fitted. However, since it was connected, there were the following problems. In addition, 12 is a mechanical splice and 13 is a pressing plate.

It is easy to break at the boundary between the optical fiber core wire and the optical fiber cable. Since the optical fiber core must be exposed for a long time, the connecting portion becomes long.

In the fusion splicing method, as shown in FIG. 6, a fusion splicing protection sleeve 4 is provided on either side of the optical fiber core wire 1.
The optical fiber core wire 1 was inserted in advance, and the optical fiber core wire 1 was held and connected by the fiber holder A ′ having only the shallow groove 2 into which the optical fiber core wire 1 was fitted. Therefore, there were the following problems. There are some fusion splicers in which the optical fiber cable 3 cannot be inserted into the windshield.

Since the length of one of the optical fiber cores must be increased by at least the length of the fusion protection sleeve, the length of the connecting portion is increased.

Conventionally, a self-fusing tape, a seal material or the like is used to seal the protective cover of the connection portion and waterproof it, so that there is a problem that workability is poor. It was

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described in the prior art, and it is possible to make the connecting portion short, and to easily waterproof the connecting portion of the optical fiber cable. -It is intended to provide a bull connecting method and a structure of a connecting portion.

[0008]

SUMMARY OF THE INVENTION An optical fiber cable connecting method according to the present invention is provided with a shallow groove into which an optical fiber core is fitted and which is continuous with the shallow groove. An optical fiber core and an optical fiber cable are provided by an optical fiber holder having a deep groove into which a protective sleeve is fitted.
It is characterized in that the connection portion is finished short by simultaneously holding the bull or the fused portion protection sleeve.

In the structure of the connecting portion of the optical fiber cable of the present invention, a binding band for fixing the optical fiber cable is attached to both ends of the upper lid and the lower lid filled with the waterproof gel, and the upper lid and the lower lid are attached. When the lids are united, the connecting part and a part of the optical fiber cable adjacent to the connecting part are placed in a cylindrical protective cover that has openings for fitting the optical fiber cable at both ends in the longitudinal direction. It is characterized in that a part of the optical fiber cable is bundled and fixed by the binding band, and if necessary, the optical fiber core wire of the connection portion is made to further shorten the connection portion. It is characterized in that it is bent or bent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the invention described in claim 1 will be described with reference to the drawings. As shown in FIG. 1, a shallow groove 2 into which an optical fiber core wire 1 is fitted is formed. Set up
2 (mechanical splice) and FIG. 3 (melting splice) by an optical fiber holder A which is continuous with the shallow groove 2 and is provided with a deep groove 5 into which the optical fiber cable 3 or the fused portion protection sleeve 4 is fitted. As shown in FIG. 2), the optical fiber core wire 1 and the optical fiber cable 3 or the fused portion protection sleeve 4 are held at the same time so that the connecting portion L is finished short.

The length of the optical fiber holder A is designed to be the same as the length of the conventional optical fiber holder A'shown in FIG.

In FIG. 3, the fusion-splicing portion protective sleeve 4 removes the optical fiber holder A after the optical fiber core wire 1 is fusion-spliced and moves it onto the fusion-splicing portion.

Therefore, in the case of the mechanical splice shown in FIG. 2, the connection portion L can be finished shorter than the conventional one by at least twice the length of the deep groove 5 of the optical fiber holder A.

In the case of the fusion splicing shown in FIG. 3, the connection portion L can be finished shorter than the conventional one by at least the length of the deep groove 5 of the optical fiber holder A.

An example of an embodiment of the invention described in claims 2-4 will be described with reference to the drawings. As shown in FIGS. 7 to 8, a waterproof gel 7 made of gel-like silicone or the like is used. A binding band 10 for fixing the optical fiber cable 3 is attached to both ends of the filled upper lid 8 or lower lid 9 (lower lid 9 in this example), and the upper lid 8 and the lower lid 9 are attached as shown in FIG. 9
When they are combined, a cylindrical protective cover B having openings 11 at both ends in the longitudinal direction into which the optical fiber cable 3 can be fitted is formed.
As shown in FIG. 9, the connection part L and a part c of the optical fiber cable 3 adjacent to the connection part L are accommodated, and the part c of the optical fiber cable 3 is bound and fixed by a binding band 10. , The upper lid 8 and the lower lid 9 are united. In addition, in FIG. 7, 6 is a hinge.

If necessary, as shown in FIGS. 10 to 11, the optical fiber core wire 1 of the connecting portion L is turned into a curved d or a w-shaped e to shorten the storage length of the connecting portion L. It's finished.

When the optical fiber core wire 1 is curved d or w-shaped, the length of the cylindrical cover in the longitudinal direction becomes short, but the width becomes wide. A partition plate or the like may be provided at the position indicated by the dotted line, and the waterproof gel 7 may be filled only around the optical fiber core wire 1, the mechanical splice 12, and the fused portion protection sleeve 4.

[0018]

Since the present invention is constructed as described above, it has the following effects. The size of the connection part can be reduced. It is possible to prevent breakage at the boundary between the optical fiber core and the optical fiber cable. Waterproofing of the connection part and assembly work are easy. The cost of the connecting member can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an optical fiber holder.

FIG. 2 is a plan view showing an embodiment of the invention (the pressing plate of the optical fiber holder is removed).

FIG. 3 is a plan view showing an embodiment of the invention (the pressing plate of the optical fiber holder is removed).

FIG. 4 is a plan view showing a conventional example (the pressing plate of the optical fiber holder is removed).

FIG. 5 is a perspective view of a conventional optical fiber holder.

FIG. 6 is a plan view showing a conventional example (the pressing plate of the optical fiber holder is removed).

FIG. 7 is a plan view of a cylindrical protective cover with the upper lid and the lower lid opened.

FIG. 8: Cylindrical protection cover with upper lid and lower lid combined
Perspective view of

FIG. 9 is a plan view showing a state in which a connecting portion is housed in a tubular protective cover (the upper lid of the tubular protective cover is omitted).

FIG. 10 is a plan view showing a state in which the connecting portion is housed in a tubular protective cover with the optical fiber core being curved (the upper lid of the tubular protective cover is omitted).

FIG. 11 is a plan view showing a state in which the connecting portion is housed in a tubular protective cover with the optical fiber core being turned in a loop shape (the upper lid of the tubular protective cover is omitted. Exist)

[Explanation of symbols]

1 Optical fiber core 2 shallow groove 3 optical fiber cable 4 Fused part protection sleeve 5 deep groove 6 hinges 7 waterproof gel 8 Top lid 9 Lower lid 10 unity band 11 openings 12 mechanical splice 13 Press plate A, A'optical fiber holder B Cylindrical protection cover L connection c Part of optical fiber cable d curve e Wappa

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Ebikawa             2-82 Watanabe Dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture             Kyushu Electric Power Co., Inc. (72) Inventor Hironori Miyagawa             2-82 Watanabe Dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture             Kyushu Electric Power Co., Inc. (72) Inventor Takuro Yamamoto             2-82 Watanabe Dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture             Kyushu Electric Power Co., Inc. (72) Inventor Yukihiro Hamada             2899 Dahara, Oita-shi, Oita West Nippon Electric Cable             Within the corporation F-term (reference) 2H036 MA05 MA11 PA02 PA13

Claims (4)

[Claims] 1. A shallow groove (2) into which an optical fiber core wire (1) is fitted is formed and is continuous with the shallow groove (2).
The optical fiber core (1) and the optical fiber cable (1) are provided by an optical fiber holder (A) having a groove (3) or a deep groove (5) into which a fused portion protection sleeve (4) is fitted. 3) or a fusion splicing protective sleeve (4) is simultaneously held to finish the connection portion (L) short, and an optical fiber cable splicing method. 2. A binding band (10) for fixing an optical fiber cable (3) is attached to both ends of an upper lid (8) and a lower lid (9) filled with a waterproof gel (7), and the upper lid is attached. When the lower lid (9) and the lower lid (8) are united, openings (1) into which optical fiber cables (3) can be fitted at both ends in the longitudinal direction.
(1) A tubular protective cover (B) forming part (c) of a connecting part (L) and an optical fiber cable (3) adjacent to the connecting part (L) is housed in the protective cover (B). Structure of optical fiber cable connecting part characterized in that a part (c) of the fiber cable (3) is bound and fixed by the binding band (10). 3. The structure of an optical fiber cable connecting portion according to claim 2, wherein the optical fiber core wire (1) of the connecting portion (L) is curved (d). 4. The structure of an optical fiber cable splicing part according to claim 2, wherein the optical fiber core wire (1) of the splicing part (L) is turned into a wavy shape (e).