JPS6235081B2 - - Google Patents
Info
- Publication number
- JPS6235081B2 JPS6235081B2 JP54130129A JP13012979A JPS6235081B2 JP S6235081 B2 JPS6235081 B2 JP S6235081B2 JP 54130129 A JP54130129 A JP 54130129A JP 13012979 A JP13012979 A JP 13012979A JP S6235081 B2 JPS6235081 B2 JP S6235081B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- repeater
- pressure
- insertion hole
- high viscosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
- G02B6/3816—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres for use under water, high pressure connectors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
- G02B6/4441—Boxes
- G02B6/4448—Electro-optic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4427—Pressure resistant cables, e.g. undersea cables
- G02B6/4428—Penetrator systems in pressure-resistant devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mechanical Coupling Of Light Guides (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Cable Accessories (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は、光フアイバケーブル海底伝送方式に
用いられる中継器、特に海底中継器の光フアイバ
導入部の構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a repeater used in an optical fiber cable submarine transmission system, and particularly to a structure of an optical fiber introduction part of a submarine repeater.
海底ケーブル伝送方式に用いられる海底中継器
の耐圧筐体における光フアイバ導入部は、海底ケ
ーブルを中継器内に導入する重要な構造部であ
り、これら導入部は、中継器の深い海底敷設位置
における高水圧、例えば水深8000ｍにおける約
800Kg／cm2の水圧に耐え、気密性が確保でき、か
つ導入部での光フアイバの光伝送特性が劣化しな
いことが要求される。 The optical fiber introduction part in the pressure-resistant case of a submarine repeater used in submarine cable transmission systems is an important structural part for introducing the submarine cable into the repeater. High water pressure, e.g. at a depth of 8000m
It is required to withstand water pressure of 800 kg/cm 2 , ensure airtightness, and not deteriorate the optical transmission characteristics of the optical fiber at the introduction section.
従つて海底中継器の光フアイバ導入部は、通常
中継器と接続する光フアイバケーブル中の光フア
イバを、その導入部の保持部材と例えば樹脂系の
接着剤等を用いて接着し、気密封止することが考
えられる。しかし前記封着部において接着剤が凝
固するときの収縮が不均一になりやすく、光フア
イバ外周に不均一な力が加わり、さらにこの部分
に大きい水圧が加わると封着部の光フアイバ外周
に不均等な外力が加わることになり、光フアイバ
に応力集中やマイクロベンデング等が発生し、導
入部における光フアイバの伝送損失が増加する恐
れがあつた。また前記接着剤と光フアイバとの熱
膨張係数が大きく異なり、これら両者の熱膨張係
数を整合させることが困難であるので、前記光フ
アイバ導入部が温度変動を受けた時、上記熱膨張
率差で伸縮する応力により光フアイバが著しく劣
化され、さらには気密封着性を低下させる問題が
ある。 Therefore, the optical fiber introduction part of a submarine repeater is usually hermetically sealed by bonding the optical fiber in the optical fiber cable that connects to the repeater to the holding member of the introduction part using, for example, a resin adhesive. It is possible to do so. However, when the adhesive solidifies at the sealing part, the shrinkage tends to be uneven, applying uneven force to the outer circumference of the optical fiber, and furthermore, if large water pressure is applied to this area, the outer circumference of the optical fiber at the sealing part becomes uneven. As a uniform external force is applied, stress concentration and microbending occur in the optical fiber, which may increase the transmission loss of the optical fiber at the introduction section. Furthermore, the thermal expansion coefficients of the adhesive and the optical fiber are significantly different, and it is difficult to match the thermal expansion coefficients of both. There is a problem that the optical fiber is significantly deteriorated due to the stress caused by expansion and contraction, and furthermore, the airtight sealing performance is reduced.
そこで本発明は、上記した欠点を解消し、高水
圧下において不均等な外力あるいは応力が負荷す
ることなく、気密封着性が確保でき低光伝送損失
の海底中継器の光フアイバ導入部を提供するもの
で、その特徴は、中継器の耐圧筐体の端面板外側
に、外圧によつて変形可能な壁部で囲まれた高粘
性液体の収容室を設けると共に、該端面を貫通し
て光伝送線挿通孔を備えた保持部材を固定し、か
つ該保持部材の前記挿通孔と前記収容室間に高粘
性液体導入孔を設け、前記挿通孔に中継器と接続
される光フアイバを挿通し、保持したことにあ
る。 SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned drawbacks and provides an optical fiber introduction part for a submarine repeater that can ensure airtight sealing without being subjected to uneven external force or stress under high water pressure, and has low optical transmission loss. Its features include a high viscosity liquid storage chamber surrounded by a wall that can be deformed by external pressure on the outside of the end plate of the pressure-resistant housing of the repeater, and a high-viscosity liquid storage chamber that is surrounded by a wall that can be deformed by external pressure. A holding member provided with a transmission line insertion hole is fixed, a high viscosity liquid introduction hole is provided between the insertion hole of the holding member and the storage chamber, and an optical fiber to be connected to a repeater is inserted into the insertion hole. , it was held.
以下図面を用いて本発明の一実施例について詳
細に説面する。 An embodiment of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の海底中継器光フアイバ導入部
の一実施例構造を示す断面図である。１は中継器
本体２を収容した耐圧筐体であり、その一端部に
端面板３が気密封着され、該端面板３の中心部を
貫通して、光伝送線挿通孔５を備えかつ該挿通孔
５内に高粘着性を有する高分子物質を主成分とし
た高粘性液体８でその中心に支持するよう光フア
イバ６を挿通してなる保持部材４が嵌着されてい
る。さらに前記端面部３の外側に、外圧によつて
変形可能なゴムベローズ７の壁部で囲まれ、前記
高粘性液体８を充填した収容室９が設けられてお
り、前記保持部材４の光伝送線挿通孔５と該収容
室９間に、高粘性液体導入孔１０が設けられ、前
記光フアイバ６はその両端を例えば軟質樹脂から
なる固定ブツシユ１１と前記高粘性液体８の流入
溜部１２の固定ブツシユ１３によつて固定され、
前記固定ブツシユ１１と、そこから延在する光フ
アイバ６に保護用のゴムキヤツプ１４が取付けら
れ、該光フアイバ６の他端は中継器本体２に接続
されている。 FIG. 1 is a sectional view showing the structure of an embodiment of the optical fiber introduction part of a submarine repeater according to the present invention. Reference numeral 1 denotes a pressure-resistant case housing a repeater main body 2. An end plate 3 is hermetically sealed to one end of the case, and an optical transmission line insertion hole 5 is provided through the center of the end plate 3. A holding member 4 having an optical fiber 6 inserted therethrough is fitted into the insertion hole 5 so as to be supported at the center by a highly viscous liquid 8 mainly composed of a highly adhesive polymeric substance. Furthermore, a storage chamber 9 is provided outside the end surface portion 3 and is surrounded by a wall portion of a rubber bellows 7 that can be deformed by external pressure, and is filled with the high viscosity liquid 8. A high viscosity liquid introduction hole 10 is provided between the wire insertion hole 5 and the accommodation chamber 9, and the optical fiber 6 has both ends connected to a fixed bushing 11 made of soft resin, for example, and an inflow reservoir 12 for the high viscosity liquid 8. fixed by a fixing bush 13;
A protective rubber cap 14 is attached to the fixed bush 11 and the optical fiber 6 extending therefrom, and the other end of the optical fiber 6 is connected to the repeater body 2.
このように本発明の光フアイバ導入部は、光フ
アイバ６が細径である特徴を生かし、該光フアイ
バ６の挿通孔５の径も非常に小さくできるので、
光フアイバ６と挿通孔５との微小間隙に高粘性液
体８が充填され、さらに耐圧筐体１の端面板３の
外側に外圧力によつて変形可能とするゴムベロー
ズ７で囲まれ前記挿通孔５と連通した高粘性液体
８を充填した収容室９等で構成することにより、
本発明の光フアイバ導入部を備えた中継器を海底
に降下した時、前記光フアイバ導入部に海水圧が
かかり、例えば収容室９のゴムベローズに受けた
圧力が内部に充填せる高粘性液体８に加わり、該
高粘性液体はその性状と、光フアイバとその挿通
孔５との微小間隙により粘性抵抗が生じ、海水圧
とバランスして非常に遅い速度の流体となつて前
記耐圧 体１内の流入溜部１２に向かつて流れ、
粘性液体８と接する光フアイバ６の全長にわた
り、第２図で示すように、外水圧P0から耐圧筐体
１内の内圧P1（１Kg／cm2）方向に徐々に減圧する
圧力分布となり、光フアイバ６とその挿入孔５は
粘性液体により密封状態が維持され、光フアイバ
外周に不均等な外力あるいは応力が負荷すること
が解消される。 As described above, the optical fiber introduction part of the present invention makes use of the feature that the optical fiber 6 has a small diameter, and the diameter of the insertion hole 5 of the optical fiber 6 can also be made very small.
A highly viscous liquid 8 is filled in the minute gap between the optical fiber 6 and the insertion hole 5, and the insertion hole is further surrounded by a rubber bellows 7 on the outside of the end plate 3 of the pressure-resistant housing 1 that can be deformed by external pressure. By comprising a storage chamber 9 etc. filled with a high viscosity liquid 8 communicating with the
When the repeater equipped with the optical fiber introduction part of the present invention is lowered to the seabed, seawater pressure is applied to the optical fiber introduction part, and for example, the pressure applied to the rubber bellows of the storage chamber 9 causes the high viscosity liquid 8 to be filled inside. In addition, the highly viscous liquid causes viscous resistance due to its properties and the small gap between the optical fiber and its insertion hole 5, and balances with the seawater pressure and becomes a fluid with a very slow velocity. Flows toward the inflow reservoir 12,
As shown in FIG. 2, over the entire length of the optical fiber 6 in contact with the viscous liquid 8, the pressure distribution is such that the pressure gradually decreases from the external water pressure P 0 to the internal pressure P 1 (1 Kg/cm 2 ) inside the pressure resistant housing 1. The optical fiber 6 and its insertion hole 5 are maintained in a sealed state by the viscous liquid, and the application of uneven external force or stress to the outer periphery of the optical fiber is eliminated.
なお本発明で適用される高粘性液体の粘性率は
温度及び圧力によつて変動し、低温、高圧力の下
では高粘性となるので、本発明における光フアイ
バ中継器では、敷設される水深と中継器の敷設年
数に応じて、その光フアイバ導入部に用いる粘性
液体の粘性率及び光フアイバを被包し流動する間
隙寸法値を調整すればよく、また水深5000ｍ以上
の深海では年中液温が２〜３℃の低温で、水圧力
が500Kg／cm2程度と、ほとんど変化のない安定し
た環境であるため、本発明の構造は極めて有利で
ある。さらに本実施例では光フアイバを単芯で用
いた場合の例で説明したが、これのみに限定する
ものではなく、例えば多芯の光フアイバケーブル
等にも適用可能なことは勿論である。 The viscosity of the high viscosity liquid used in the present invention varies depending on temperature and pressure, and becomes highly viscous at low temperatures and high pressures. Depending on the number of years the repeater has been installed, the viscosity of the viscous liquid used in the optical fiber introduction part and the gap size in which the optical fiber is encapsulated and flows can be adjusted. The structure of the present invention is extremely advantageous because the temperature is a low temperature of 2 to 3° C. and the water pressure is about 500 Kg/cm 2 , a stable environment with almost no changes. Furthermore, although the present embodiment has been described as an example in which a single-core optical fiber is used, the present invention is not limited to this only, and of course can be applied to, for example, a multi-core optical fiber cable.
以上の説明から明らかなように、本発明に係る
光フアイバ中継器の導入部は、海底外圧によつて
光フアイバが常に微流動する高粘性液体で完全に
被包された構造としているので、前記導入部では
外部との気密が維持され、かつ光フアイバに対し
急激な圧力変動や、従来の接着剤封止のごとき不
均等な外圧力が加わる恐れが解消し、伝送損失が
改善されるなど、光フアイバ海底伝送方式におけ
る中継器に限らず、高圧力下における光フアイバ
伝送方式の中継器に適用して極めて有利である。 As is clear from the above description, the introduction part of the optical fiber repeater according to the present invention has a structure in which the optical fiber is completely covered with a highly viscous liquid that constantly flows slightly due to the external pressure on the seabed. The introduction part maintains airtightness from the outside, eliminates the risk of sudden pressure fluctuations and uneven external pressure being applied to the optical fiber as in conventional adhesive sealing, and improves transmission loss. It is extremely advantageous to apply not only to repeaters in optical fiber submarine transmission systems but also to repeaters in optical fiber transmission systems under high pressure.
第１図は本発明に係る海底中継器光フアイバ導
入部の一実施例構造を説明する断面図、第２図は
本発明に係る中継器光フアイバ導入部における光
フアイバに加わる圧力分布状態を示す図である。
１：耐圧筐体、２：中継器本体、３：端面板、
４：保持部材、５：光伝送線挿通孔、６：光フア
イバ、７：ゴムベローズ、８：高粘性液体、９：
液体収容室、１０：高粘性液体導入孔、１１，１
３：固定ブツシユ、１２：流入溜部、１４：ゴム
キヤツプ。
FIG. 1 is a sectional view illustrating the structure of an embodiment of the optical fiber introducing section of a submarine repeater according to the present invention, and FIG. 2 shows the pressure distribution state applied to the optical fiber at the optical fiber introducing section of the repeater according to the present invention. It is a diagram. 1: Pressure resistant housing, 2: Repeater main body, 3: End plate,
4: Holding member, 5: Optical transmission line insertion hole, 6: Optical fiber, 7: Rubber bellows, 8: High viscosity liquid, 9:
Liquid storage chamber, 10: High viscosity liquid introduction hole, 11, 1
3: Fixed bush, 12: Inflow reservoir, 14: Rubber cap.
Claims (1)
つて変形可能な壁部で囲まれた高粘性液体の収容
室を設けると共に、該端面を貫通して光フアイバ
挿通孔を備えた保持部材を固定し、かつ該保持部
材の前記挿通孔と前記収容室間に高粘性液体導入
孔を設け、前記挿通孔に中継器と接続される光フ
アイバを挿通し保持させることにより気密封止す
ることを特徴とする光フアイバ中継器。1. A high viscosity liquid storage chamber surrounded by a wall that can be deformed by external pressure is provided on the outside of the end plate of the pressure-resistant casing of the repeater, and a holding chamber is provided with an optical fiber insertion hole penetrating the end surface. The member is fixed, and a high viscosity liquid introduction hole is provided between the insertion hole of the holding member and the storage chamber, and an optical fiber connected to the repeater is inserted into the insertion hole and held, thereby airtightly sealing. An optical fiber repeater characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13012979A JPS5654138A (en) | 1979-10-09 | 1979-10-09 | Optical fiber relay device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13012979A JPS5654138A (en) | 1979-10-09 | 1979-10-09 | Optical fiber relay device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5654138A JPS5654138A (en) | 1981-05-14 |
| JPS6235081B2 true JPS6235081B2 (en) | 1987-07-30 |
Family
ID=15026637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13012979A Granted JPS5654138A (en) | 1979-10-09 | 1979-10-09 | Optical fiber relay device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5654138A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6431171U (en) * | 1987-08-20 | 1989-02-27 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59176706A (en) * | 1983-03-28 | 1984-10-06 | Kokusai Denshin Denwa Co Ltd <Kdd> | Optical fiber airtight fixation structure of feedthrough for optical submarine repeater |
| JPS59226612A (en) * | 1983-06-06 | 1984-12-19 | 工業技術院長 | Cable connection unit |
| JPS62129506U (en) * | 1986-11-06 | 1987-08-15 |
-
1979
- 1979-10-09 JP JP13012979A patent/JPS5654138A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6431171U (en) * | 1987-08-20 | 1989-02-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5654138A (en) | 1981-05-14 |
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