【発明の詳細な説明】〔産業上の利用分野〕本発明は、光海底ケーブルに用いる海中分岐装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an underwater branching device used for an optical submarine cable.
光伝送技術の進歩に伴い、海底ケーブルも光海底ケーブ
ルに変わりつつある。この際、３地点以上の間に光海底
ケーブルを布設する場合には、低コスト化のため所望の
個所に、光信号を分岐結合する海中分岐装置が使用され
る。With advances in optical transmission technology, submarine cables are also being replaced by optical submarine cables. At this time, when an optical submarine cable is installed between three or more points, an underwater branching device is used to branch and couple optical signals at desired locations to reduce costs.
この海中分岐装置にて分岐結合された光海底ケーブルに
は、途中に設けられた中継器等のために、主光海底ケー
ブルの給電系とは別に、第３図に示すように、分岐光海
底ケーブルにも給電系が必要である。As shown in Figure 3, the optical submarine cable branched and coupled by this underwater branching device is equipped with a branch optical submarine cable, in addition to the power supply system of the main optical submarine cable, for repeaters installed on the way. The cable also requires a power supply system.
第３図（ａ）は光海底ケーブルの布設要領図、（ｂ）は
給電系図であって、海を隔てた地上Ａ。Figure 3 (a) is a diagram of the installation procedure for the optical submarine cable, and Figure 3 (b) is a diagram of the power supply system, which is located on land A across the ocean.
地上８間に光海底ケーブル（図では光海底ケーブル２と
光海底ケーブル３とで接続して示す）を布設した場合に
、この光海底ケーブルの中継器Ｍ。When an optical submarine cable (in the figure, optical submarine cable 2 and optical submarine cable 3 are shown connected) is installed between the ground and the ground, a repeater M of this optical submarine cable is installed.
に対して給電を行うため、第３図（ｂ）の如≦、地上Ａ
、境地上のいずれか一方に（＋）電源を、他方に（−）
電源を接続して行う。As shown in Figure 3(b), in order to supply power to
, connect (+) power to one side of the ground and (-) to the other.
Connect the power supply.
そして、地上Ａ及び地上Ｂのいずれとも、海を隔てた離
れた他の地上２例えば島Ｃと地上Ａ及び地上Ｂとの間に
光海底ケーブルを布設するには、地上Ａ、地主１８間結
ぶ光海底ケーブル２と光海底ケーブル３の接続点に、海
中分岐装置１を設は海中分岐装置１内で、光海底ケーブ
ル２及び光海底ケーブル３内の光ファイバと、島Ｃ向け
の分岐光海底ケーブル４内の光ファイバとを接続する。In order to install an optical submarine cable between ground A and ground B, for example, island C and ground A and ground B, it is necessary to connect between ground A and landowner 18. An underwater branching device 1 is installed at the connection point of the optical submarine cable 2 and the optical submarine cable 3. The underwater branching device 1 connects the optical fibers in the optical submarine cable 2 and the optical submarine cable 3 to the branch optical submarine cable for island C. Connect it to the optical fiber in the cable 4.
この際、分岐光海底ケーブル４の途中に設けた中継器Ｍ
２、及び海中分岐袋Ｎｌ内に設けた制御装置への給電の
ため、海中分岐装置１の近傍り点にアース電極を設置し
、島Ｃに（＋）電極を接続する。このアース電極を流れ
る電流により、アース電極の近辺に金属物、例えば海中
分岐装置の筐体等が存在すると、該金属物は電蝕を起こ
す。したがって、電蝕防止のため、アース電極は、海中
分岐装置ｌより少なくとも数百米離れた海底位置に設け
なければならない。At this time, a repeater M installed in the middle of the branch optical submarine cable 4
2, and to supply power to the control device provided in the underwater branch bag Nl, a ground electrode is installed at a point near the underwater branch device 1, and a (+) electrode is connected to the island C. If a metal object, such as a casing of an underwater branching device, exists near the earth electrode, the current flowing through the earth electrode causes electrolytic corrosion of the metal object. Therefore, in order to prevent galvanic corrosion, the earth electrode must be located on the seabed at least several hundred meters away from the underwater branching device 1.
この海中分岐装置には、低コストで、且つ布設時の作業
が容易なことが要望されている。This underwater branching device is required to be low cost and easy to install.
従来の海中分岐装置は、第４図の一部破断平面図の如く
構成されている。A conventional underwater branching device is constructed as shown in a partially cutaway plan view of FIG.
海中分岐装Ｗ１の本体の、円筒状の筐体の一方の端面に
は、一方の光海底ケーブル２及びアースケーブル５が並
列して導入され、他方の対面には、他方の光海底ケーブ
ル３と、分岐光海底ケーブル４とが並列して導入されて
いる。One end face of the cylindrical casing of the main body of the underwater branching equipment W1 has one optical submarine cable 2 and a ground cable 5 introduced in parallel, and the other optical submarine cable 3 and a ground cable 5 are introduced in parallel on the other side. , branch optical submarine cable 4 are installed in parallel.
これらの光海底ケーブル２，３、分岐光海底ケーブル４
及びアースケーブル５は、それぞれケーブル引留部１０
，１１．１２及び１３を介して、海中分岐装置本体の筐
体に固着されている。These optical submarine cables 2 and 3, branch optical submarine cable 4
and the ground cable 5 are each connected to a cable retention section 10.
, 11, 12 and 13, it is fixed to the casing of the underwater branching device main body.
また、それぞれのケーブルは、それぞれ気密封止部８．
９を通して、分岐装置筐体内部の分岐部７に引き込まれ
ている。Each cable also has a hermetically sealed portion 8.
9 and is drawn into the branching section 7 inside the branching device housing.
光海底ケーブル２と同構造のアースケーブル５は、長さ
がほぼ１０００米で、内部の電源線が海中分岐装置１内
で、制御装置等に給電するとともに、分岐光海底ケーブ
ル４の電源線に接続されている。The ground cable 5, which has the same structure as the optical submarine cable 2, has a length of approximately 1000 meters, and the internal power line supplies power to the control equipment etc. in the underwater branching device 1, and also connects to the power line of the branching optical submarine cable 4. It is connected.
このアースケーブル５の端末を封止し、外被を剥離して
電源線を裸出せしめ、この裸出部の外周面に導体金属２
例え１ｆチタン合金よりなるアース電極６を接続装着し
、海中にアースしている。The terminal of this ground cable 5 is sealed, the outer sheath is peeled off to expose the power wire, and a conductor metal 2 is placed on the outer peripheral surface of this exposed part.
For example, a ground electrode 6 made of a 1F titanium alloy is connected and installed, and is grounded in the sea.
しかしながら上記従来の海中分岐装置は、光海底ケーブ
ルが２本、分岐光海底ケーブル及びアースケーブルがそ
れぞれ１本、計４本のケーブルか筐体に導入され、それ
ぞれにケーブル引留部が構成されて構造が複雑で、コス
ト高であるばかりでなく、高価のチタン合金よりなるア
ース電極を多聞に使用するという問題点がある。However, the conventional underwater branching device described above has a structure in which a total of four cables, two optical submarine cables, one branch optical submarine cable and one ground cable each, are introduced into the casing, and each cable retaining section is configured. There are problems in that not only is the process complicated and expensive, but also ground electrodes made of expensive titanium alloy are often used.
また、布設船上で４本の袂−プルを海中分岐装置に接続
するという煩わしさがある。Additionally, there is the hassle of connecting the four sleeve pulls to the underwater branching device on the laying ship.
上記従来の問題点は、少なくとも１つの光海底ケーブル
の外周に、さらに絶縁被覆されたアース導体を該海中分
岐装置より所望の長さ設け、該アース導体の端部におい
て、導電性外装体にて固着された分割形のアース電極と
接続してなる、本発明の海中分岐装置によって解決され
る。The above-mentioned conventional problem is that an insulated ground conductor is further provided on the outer periphery of at least one optical submarine cable to a desired length from the underwater branching device, and a conductive outer sheath is attached to the end of the ground conductor. This problem is solved by the underwater branching device of the invention, which is connected to a fixed, split-type earth electrode.
上記本発明の手段によれば、光海底ケーブルの海中分岐
装置側の一部が、アース用ケーブルを構成しているので
、海中分岐装置に導入するケーブルを３本にすることが
でき、ケーブルの接続作業が容易である。According to the above means of the present invention, since a part of the optical submarine cable on the underwater branching device side constitutes the grounding cable, the number of cables introduced into the underwater branching device can be reduced to three, and the number of cables can be reduced to three. Connection work is easy.
また、ケーブル引留部がそれなりに少なく、構造が簡易
であり、高価の材料は外装線のみに少量使用することに
より低コストである。In addition, the number of cable anchoring parts is relatively small, the structure is simple, and a small amount of expensive material is used only for the outer wire, resulting in low cost.
さらにまた、アース電極が分割型であるので、光海底ケ
ーブルを切断することなくアース用ケーブルの端末に、
アース電極を装着することができ低コストである。Furthermore, since the ground electrode is a split type, it can be attached to the terminal of the ground cable without cutting the optical submarine cable.
A ground electrode can be attached and the cost is low.
以下図示実施例により、本発明の要旨を具体的に説明す
る。なお、全図を通じて同一符号は同一対象物を示す。The gist of the present invention will be specifically explained below with reference to illustrated examples. Note that the same reference numerals indicate the same objects throughout the figures.
第１図は、本発明の１実施例の一部破断断面図であり、
第２図は、アース用ケーブルの断面図である。FIG. 1 is a partially cutaway sectional view of one embodiment of the present invention,
FIG. 2 is a sectional view of the grounding cable.
第１図及び第２図において、海中分岐装置４０の本体４
１の一方の端面には、光海底ケーブル２０が導入され、
他方の端面には光海底ケーブル３と分岐光海底ケーブル
４とが導入されている。In FIGS. 1 and 2, the main body 4 of the underwater branching device 40
An optical submarine cable 20 is introduced into one end face of 1,
An optical submarine cable 3 and a branch optical submarine cable 4 are introduced into the other end face.
光海底ケーブル２０・は、第３図（ａ）において、地上
Ａに接続される光海底ケーブル２に相当する。The optical submarine cable 20 corresponds to the optical submarine cable 2 connected to the ground A in FIG. 3(a).
光海底ケーブル２０の外周には、詳細を第２図に示すよ
うなアース用ケーブル３０が、海中分岐装置４０の本体
４１よりほぼ５００米にわたり設けられている。On the outer periphery of the optical submarine cable 20, a grounding cable 30 as shown in detail in FIG. 2 is provided extending approximately 500 meters from the main body 41 of the underwater branching device 40.
光海底ケーブル２０は心線の周囲に、螺旋状に複数の光
ファイバ２１が並設され、その外周には、絶縁層を介し
て抗張力体２２が螺旋状に並設されている。抗張力体２
２の外周には、例えば銅パイプよりなる電源線２３が設
けられ、電源線２３の外周面は、外被となる絶縁体層２
４（材料は、例えばポリエチレン）が設けられている。In the optical submarine cable 20, a plurality of optical fibers 21 are spirally arranged in parallel around a core wire, and tensile strength members 22 are spirally arranged in parallel on the outer periphery of the fibers with an insulating layer interposed therebetween. Tensile strength body 2
A power line 23 made of, for example, a copper pipe is provided on the outer periphery of the power line 2, and the outer circumferential surface of the power line 23 is covered with an insulating layer 2 serving as an outer covering.
4 (made of polyethylene, for example).
アース用ケーブル３０は、この光海底ケーブル２０の絶
縁体層２４の外周に、例えば銅編組線よりなるアース導
体２５が設けられ、アース導体２５の外周面は、例えば
ポリエチレンよりなる外被２６で覆われている。In the grounding cable 30, a grounding conductor 25 made of, for example, copper braided wire is provided on the outer periphery of the insulating layer 24 of the optical submarine cable 20, and the outer peripheral surface of the grounding conductor 25 is covered with a jacket 26 made of, for example, polyethylene. It is being said.
このように、光海底ケーブル２０の外周面に設けられた
アース用ケーブル３０のアース導体２５は、分岐部７内
で分岐側の光海底ケーブル４の電源線に接続されている
。In this way, the grounding conductor 25 of the grounding cable 30 provided on the outer peripheral surface of the optical submarine cable 20 is connected to the power line of the optical submarine cable 4 on the branch side within the branching section 7 .
アース用ケーブル３０の端末は、外被２６が剥離され、
低価の導電性金属９例えばベリリウム銅合金よりなる円
筒状の導体を、軸方向に２分割した分割型のアース電極
３１が、アース導体２５の外周面に密着して装着されて
いる。両端の外径が小径の段付き半円筒形のアース電極
３１の両端部は、外被２６と同時にモールド成形された
外被２゜６Ａにより覆われ、光海底ケーブル２０の外被
２４ととも一体に固着されている。At the terminal of the grounding cable 30, the outer sheath 26 is peeled off,
A split-type ground electrode 31, which is obtained by dividing a cylindrical conductor made of a low-cost conductive metal 9, such as a beryllium copper alloy, into two parts in the axial direction is attached to the outer circumferential surface of the ground conductor 25 in close contact. Both ends of the stepped semi-cylindrical earth electrode 31 with a small outer diameter at both ends are covered with an outer sheath 2°6A molded at the same time as the outer sheath 26, and are integrated with the outer sheath 24 of the optical submarine cable 20. is fixed to.
アース電極３１及び外被２６Ａの外周面は、硬質で耐電
蝕性ある導電性金属板、例えばチタン合金フープ材より
なる外装線３２が、オーバーラツプ工法により巻着され
、外装線３２の両端部は、同材質の線材よりなる固着線
３３を、巻着し固着している。An exterior wire 32 made of a hard, electrically corrosion-resistant conductive metal plate, such as a titanium alloy hoop material, is wrapped around the outer circumferential surface of the earth electrode 31 and the outer sheath 26A by an overlap method, and both ends of the exterior wire 32 are A fixed wire 33 made of the same material is wound and fixed.
このようなアース用ケーブル３０の制作、及びアース電
極３１の装着は、光海底ケーブル２０を切断することな
く、予め工場内で容易に実施することができる。したが
うて、高品質、且つ充分な信幀性が得られる。Such production of the grounding cable 30 and attachment of the grounding electrode 31 can be easily carried out in advance in a factory without cutting the optical submarine cable 20. Therefore, high quality and sufficient reliability can be obtained.
また、アース電極３１及び外被２６Ａは、硬質の外装線
３２により保護されているので、布設時に損傷すること
がない。Moreover, since the earth electrode 31 and the outer sheath 26A are protected by the hard outer wire 32, they will not be damaged during installation.
なお、海中分岐装置４０は、実際に必要とするケーブル
が３本のみで、構造が簡単で、低コストである。Note that the underwater branching device 40 actually requires only three cables, has a simple structure, and is low in cost.
以上説明したように本発明は、光海底ケーブルの外周部
にアース用ケーブルを設けたもので、構成が簡単で低コ
ストであり、ケーブルの接続作業が容易である等、実用
上で優れた効果がある。As explained above, the present invention provides a grounding cable on the outer periphery of an optical submarine cable, and has excellent practical effects such as a simple configuration, low cost, and easy cable connection work. There is.
第１図は本発明の１実施例の一部破断断面図、第２図は
アース用ケーブルの断面図、第３図（ａ）は光海底ケーブルの布設要領図、（ｂ）は
給電系図、第４図は従来の海中分岐装置の一部破断断面図である。図において、１．４０は海中分岐装置、２．３．２０は光海底ケーブル、４は分岐光海底ケーブル、５はアースケーブル、６．３１はアース電極、８．９は気密封止部、１０、’ｌｌ、１２．１３はケーブル引留部、２１は光
ファイバ、２３は電源線、２５はアース導体、２６．２６Ａは外被、３０はアース用ケーブル、３２は外装線、３３は固着線、４１は本体をそれぞれ示す。第１ 因ｌθ軍３ し戸１′（ン２ンFig. 1 is a partially cutaway sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of a grounding cable, Fig. 3(a) is a diagram of the installation procedure of an optical submarine cable, and (b) is a power supply system diagram. FIG. 4 is a partially cutaway sectional view of a conventional underwater branching device. In the figure, 1.40 is an underwater branching device, 2.3.20 is an optical submarine cable, 4 is a branching optical submarine cable, 5 is a grounding cable, 6.31 is a grounding electrode, 8.9 is an airtight sealing part, 10 ,'ll, 12.13 is a cable stop, 21 is an optical fiber, 23 is a power line, 25 is a ground conductor, 26.26A is a jacket, 30 is a ground cable, 32 is a jacket wire, 33 is a fixed wire, 41 indicates the main body. 1st cause lθ army 3 Shido 1' (n2n
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14840784AJPS6127510A (en) | 1984-07-17 | 1984-07-17 | Undersea branching equipment for optical submarine cables |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14840784AJPS6127510A (en) | 1984-07-17 | 1984-07-17 | Undersea branching equipment for optical submarine cables |
| Publication Number | Publication Date |
|---|---|
| JPS6127510Atrue JPS6127510A (en) | 1986-02-07 |
| JPH023962B2 JPH023962B2 (en) | 1990-01-25 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14840784AGrantedJPS6127510A (en) | 1984-07-17 | 1984-07-17 | Undersea branching equipment for optical submarine cables |
| Country | Link |
|---|---|
| JP (1) | JPS6127510A (en) |
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| Publication number | Publication date |
|---|---|
| JPH023962B2 (en) | 1990-01-25 |
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