JPH07104455B2 - Optical fiber high strength connection method - Google Patents
Optical fiber high strength connection methodInfo
- Publication number
- JPH07104455B2 JPH07104455B2 JP62221677A JP22167787A JPH07104455B2 JP H07104455 B2 JPH07104455 B2 JP H07104455B2 JP 62221677 A JP62221677 A JP 62221677A JP 22167787 A JP22167787 A JP 22167787A JP H07104455 B2 JPH07104455 B2 JP H07104455B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- coating
- bare optical
- connection
- connection method
- 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 - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 title claims description 52
- 238000000034 method Methods 0.000 title claims description 30
- 239000011248 coating agent Substances 0.000 claims description 26
- 238000000576 coating method Methods 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 2
- 238000009501 film coating Methods 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000007526 fusion splicing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Mechanical Coupling Of Light Guides (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は例えば海底光ケーブルの接続、工場内接続、心
線切換装置などに好適な光ファイバの高強度接続方法に
関するものである。Description: TECHNICAL FIELD The present invention relates to a high-strength optical fiber connection method suitable for, for example, submarine optical cable connection, in-plant connection, and core wire switching device.
（従来技術及び解決しようとする問題点） 従来、高強度接続の手法として融着接続法を用いるため
には、まづ被覆を除去する手段に工夫が必要であった。
つまり、通常の接続のように被覆を機械的に除去し、ガ
ーゼ等で裸光ファイバの表面を拭う方法では、光ファイ
バの強度が低下するため、薬品を用いて被覆を除去する
方法をとるのが主流であった。(Prior Art and Problems to Be Solved) Conventionally, in order to use the fusion splicing method as a method for high-strength connection, it was necessary to devise means for removing the coating.
In other words, in the method of mechanically removing the coating like normal connection and wiping the surface of the bare optical fiber with gauze or the like, the strength of the optical fiber is reduced, so a method of removing the coating with a chemical is used. Was the mainstream.
この方法は、光ファイバの端末を濃硫酸等に浸すことで
光ファイバ表面の被覆残留物を溶解させ、取除くもの
で、裸光ファイバの強度劣化が殆んど無いことが確認さ
れている。In this method, the coating residue on the surface of the optical fiber is dissolved and removed by immersing the end of the optical fiber in concentrated sulfuric acid or the like, and it has been confirmed that there is almost no strength deterioration of the bare optical fiber.
しかし、この方法は薬品を使用するため工事現場での使
用に制限があるばかりでなく、除去に時間がかかり、作
業性の阻害要因となっていた。又被覆の除去際が汚くて
被覆除去長が明確でなく、接続、補強の信頼性が低くな
るという問題点がある。However, since this method uses chemicals, it is not only limited in use at a construction site, but also takes a long time to remove it, which is an obstacle to workability. Further, there is a problem that the coating removal length is unclear and the coating removal length is not clear, and the reliability of connection and reinforcement is lowered.
（問題点を解決するための手段） 本発明は上述の問題点を解消し、薬品を使用せず、かつ
強度が低下しない光ファイバの高強度接続方法を提供す
るもので、その特徴は、被覆光ファイバの被覆部を加熱
し、被覆を長手方向に若干ずらすことにより裸光ファイ
バ部を露出させた後、上記露出した裸光ファイバに加傷
し、裸光ファイバ部に接触することなく曲げ及び引張り
応力を与えて裸光ファイバを切断し、その後再び被覆を
除去して所定長さの裸光ファイバを露出し、該露出した
裸光ファイバの表面を放電によりクリーニングし、この
部分に薄膜コーティングを施し、しかる後Ｖ溝にセット
して融着接続し、接続部を補強することにある。(Means for Solving Problems) The present invention solves the problems described above, and provides a high-strength connection method for optical fibers that does not use chemicals and does not decrease in strength. After exposing the bare optical fiber portion by heating the coating portion of the optical fiber and slightly shifting the coating in the longitudinal direction, the exposed bare optical fiber is damaged and bent without contacting the bare optical fiber portion. A tensile stress is applied to cut the bare optical fiber, the coating is then removed again to expose a bare optical fiber of a predetermined length, the exposed bare optical fiber surface is cleaned by electrical discharge, and a thin film coating is applied to this portion. Then, it is set in the V groove and then fusion-bonded to reinforce the connecting portion.
第１図は本発明の高強度接続方法の工程フローチャー
ト、第２図は本発明の高強度接続方法の手順の説明図で
ある。FIG. 1 is a process flow chart of the high-strength connection method of the present invention, and FIG. 2 is an explanatory diagram of a procedure of the high-strength connection method of the present invention.
まず、第２図（ａ）に示すように、後述する方法によ
り、被覆光ファイバ（１）の被覆部を加熱して被覆を長
手方向に若干ずらし、２〜3mmの区間のみ裸光ファイバ
（２）を露出させる。この露出した裸光ファイバ（２）
を第２図（ｂ）に示すように切断する。First, as shown in FIG. 2 (a), the coating portion of the coated optical fiber (1) is heated by the method described later to slightly shift the coating in the longitudinal direction, and the bare optical fiber (2 ) Is exposed. This exposed bare optical fiber (2)
Is cut as shown in FIG. 2 (b).
上記裸光ファイバ（２）の切断は、第３図に示すよう
に、露出した裸光ファイバ（２）両側の被覆光ファイバ
部（１）でクランプ（20）し、裸光ファイバ（２）に加
傷刃（21）で初期傷を付与し、しかる後、切断ヘッド
（22）を上昇させて光ファイバに曲げ及び引張り応力を
与えることにより裸光ファイバ（２）を切断する。この
際、切断ヘッド（22）は被覆光ファイバ（１）部に接触
し、裸光ファイバ（２）部には接触しないようにする。
このためには切断ヘッド（22）の先端部の幅は露出した
裸光ファイバ（２）部の長さより大きく、先端の半径は
20mm以上とするのが望ましい。To cut the bare optical fiber (2), as shown in FIG. 3, the bare optical fiber (2) is clamped (20) at the coated optical fiber portions (1) on both sides of the bare optical fiber (2) to form the bare optical fiber (2). The scratch blade (21) gives an initial scratch, and then the cutting head (22) is raised to apply bending and tensile stress to the optical fiber to cut the bare optical fiber (2). At this time, the cutting head (22) contacts the coated optical fiber (1) portion and does not contact the bare optical fiber (2) portion.
To do this, the width of the tip of the cutting head (22) is larger than the length of the exposed bare optical fiber (2), and the radius of the tip is
It is desirable to set it to 20 mm or more.
次に第２図（Ｃ）に示すように、接続に必要な所定長
（５〜15mm）の裸光ファイバ（２）を露出させるため、
光ファイバ（１）の端末部被覆を除去する。Next, as shown in FIG. 2 (C), in order to expose the bare optical fiber (2) of a predetermined length (5 to 15 mm) necessary for connection,
The end coating of the optical fiber (1) is removed.
この被覆の除去及び前記被覆を加熱して長手方向にずら
して裸光ファイバの一部を露出させる工程には第４図に
示す方法を用いる。即ち、除去しようとする被覆光ファ
イバ（１）の被覆部をヒータ（25）で加熱して被覆と内
部のガラスファイバとの密着力を低減させる。切刃（2
6）の被覆部への切込みは、加熱によって被覆が軟化す
る前に行ない、切込み後、切刃（26）は逃がしておく。
被覆の除去は、ヒータ（25）を内包したクランプ材（2
4）で互いに押しつけながら、光ファイバの長手方向
（図の矢印の方向）に移動させることにより行なう。な
お、図面において、（23）は他方の被覆光ファイバ
（１）のクランプ材である。The method shown in FIG. 4 is used for the removal of this coating and the step of heating the coating and shifting it in the longitudinal direction to expose a part of the bare optical fiber. That is, the coating portion of the coated optical fiber (1) to be removed is heated by the heater (25) to reduce the adhesive force between the coating and the glass fiber inside. Cutting blade (2
The cutting of (6) into the covering part is performed before the covering softens by heating, and the cutting blade (26) is allowed to escape after the cutting.
To remove the coating, use the clamp material (2
While pressing each other in 4), move the optical fiber in the longitudinal direction (direction of the arrow in the figure). In the drawing, (23) is a clamp material for the other coated optical fiber (1).
上記被覆の加熱源としてのヒータ（25）は上下一対で図
示しているが、片側のみでもよく、又発熱体としては、
ニクロム線、セラミックヒータ等100〜200℃の温度が維
持可能であれば種類を問わない。Although the heater (25) as a heating source for the coating is shown as a pair of upper and lower sides, it may be provided on only one side, and as a heating element,
Any type of nichrome wire, ceramic heater, etc. can be used as long as it can maintain a temperature of 100 to 200 ° C.
続いて第２図（ｄ）に示すように、被覆光ファイバ
（１）部をクランプし、電極棒（11）による放電加熱に
より、裸光ファイバ（２）表面に残存する被覆屑を気散
させる。この際、残存物の性状によっては、大気中では
なく、不活性ガスの雰囲気中で行なうことが望ましい場
合がある。Then, as shown in FIG. 2 (d), the coated optical fiber (1) is clamped, and the coating dust remaining on the surface of the bare optical fiber (2) is diffused by discharge heating by the electrode rod (11). . At this time, depending on the properties of the residue, it may be desirable to carry out in an atmosphere of an inert gas rather than in the atmosphere.
清浄化された裸光ファイバ（２）上には第２図（ｅ）の
ように厚さ数〜10μｍ程度に樹脂の塗布層（３）を施
し、固化させて、裸光ファイバ（２）が直接他の物体と
接触するのを防止する。この際、先端近傍は融着接続時
の放電により燃焼し、接続損失や強度に悪影響を与える
ことが懸念されるため、先端より２〜3mm手前までにと
どめておくことが望ましい。又このコーティング用樹脂
としては、短時間で固化する紫外線硬化型樹脂を用いれ
ば作業性が促進される。On the cleaned bare optical fiber (2), as shown in FIG. 2 (e), a resin coating layer (3) having a thickness of several to 10 μm is applied and solidified to form a bare optical fiber (2). Prevents direct contact with other objects. At this time, the vicinity of the tip may be burned by the electric discharge during fusion splicing, which may adversely affect the connection loss and the strength. Therefore, it is preferable to keep the tip within 2-3 mm before the tip. Further, as the coating resin, if an ultraviolet curable resin that solidifies in a short time is used, workability is promoted.
しかる後、第２図（ｆ）に示すように、裸光ファイバ
（２）上に樹脂の塗布層（３）を施した部分をＶ溝（1
2）にセットして軸調心を行ない、通常の電極棒（13）
による放電によって裸光ファイバ（２）を融着接続し、
第２図（ｇ）のような接続部を得る。After that, as shown in FIG. 2 (f), the portion where the resin coating layer (3) is applied on the bare optical fiber (2) is placed in the V groove (1
Set it to 2) to align the axis, and use the normal electrode rod (13).
The optical fiber (2) is fusion spliced by the discharge by
A connection part as shown in FIG. 2 (g) is obtained.
最後に上記接続部近傍を補強するが、これには２通りの
方法があって、工場内接続のようにモールド金型を使用
して外径を均一化した被覆部修復（４）方法（第２図
ｈ）と、海底ケーブルの中継器内接続等のように、外径
を問わず、補強部材（５）を用いた補強方法（第２図
ｉ）がある。Finally, the vicinity of the connection part is reinforced. There are two methods for this, and there is a method of repairing the coating part (4) in which the outer diameter is made uniform by using a molding die as in the factory connection (the first method). 2h) and a reinforcing method (Fig. 2i) using a reinforcing member (5) regardless of the outer diameter, such as connection of a submarine cable in a repeater.
いずれにしても、本発明は接続及び補強については、特
にその方法を限定するものではない。In any case, the present invention does not particularly limit the method for connection and reinforcement.
（発明の効果） 以上説明したように本発明の方法によれば、被覆の除
去、切断をはじめすべての工程において、裸光ファイバ
が他の物体に接触することなく実施し、しかも薬品類を
用いることがないので、きわめて短時間に、高品質の高
強度接続を実現するものである。(Effects of the Invention) As described above, according to the method of the present invention, the bare optical fiber is carried out in all steps including the removal and cutting of the coating without coming into contact with other objects, and chemicals are used. Therefore, a high quality and high strength connection can be realized in a very short time.
第１図（ａ）〜（ｉ）は本発明の高強度接続方法の工程
フローチャート、第２図（ａ）〜（ｉ）は第１図の工程
フローチヤートに対応する本発明接続方法の手順の説明
図である。 第３図は本発明方法における裸光ファイバの切断方法の
説明図である。 第４図（イ）及び（ロ）は本発明方法における被覆除去
手段の説明図である。 １……被覆光ファイバ、２……裸光ファイバ、３……樹
脂塗布層、４……被覆修復部、５……補強部材、11、13
……電極棒、12……Ｖ溝、20、23……クランプ、21……
加傷刃、22……切断ヘッド、24……ヒータ内蔵クラン
プ、25……ヒータ、26……切刃。1 (a) to (i) are process flow charts of the high-strength connection method of the present invention, and FIGS. 2 (a) to (i) are processes of the connection method of the present invention corresponding to the process flow chart of FIG. FIG. FIG. 3 is an explanatory view of a method of cutting a bare optical fiber in the method of the present invention. FIGS. 4A and 4B are explanatory views of the coating removing means in the method of the present invention. 1 ... Coated optical fiber, 2 ... Naked optical fiber, 3 ... Resin coating layer, 4 ... Coating restoration part, 5 ... Reinforcing member, 11, 13
...... Electrode, 12 …… V groove, 20,23 …… Clamp, 21 ……
Scratch blade, 22 …… cutting head, 24 …… heater built-in clamp, 25 …… heater, 26 …… cutting blade.
Claims (1)
長手方向に若干ずらすことにより裸光ファイバ部を露出
させた後、上記露出した裸光ファイバに加傷し、裸光フ
ァイバ部に接触することなく曲げ及び引張り応力を与え
て裸光ファイバを切断し、その後再び被覆を除去して所
定長の裸光ファイバを露出し、該露出した裸光ファイバ
の表面を放電によりクリーニングし、この部分に薄膜コ
ーティングを施し、しかる後Ｖ溝にセットして融着接続
し、接続部を補強することを特徴とする光ファイバの高
強度接続方法。1. A bare optical fiber portion is exposed by heating the coated portion of the coated optical fiber and shifting the coating slightly in the longitudinal direction, and then the exposed bare optical fiber is scratched to form a bare optical fiber portion. Bending and tensile stress are applied without contact to cut the bare optical fiber, then the coating is removed again to expose the bare optical fiber of a predetermined length, and the exposed surface of the bare optical fiber is cleaned by discharge. A high-strength connection method for an optical fiber, characterized in that a thin film coating is applied to a part, and then the part is set in a V groove and fusion-spliced to reinforce the connection part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62221677A JPH07104455B2 (en) | 1987-09-03 | 1987-09-03 | Optical fiber high strength connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62221677A JPH07104455B2 (en) | 1987-09-03 | 1987-09-03 | Optical fiber high strength connection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6463905A JPS6463905A (en) | 1989-03-09 |
| JPH07104455B2 true JPH07104455B2 (en) | 1995-11-13 |
Family
ID=16770543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62221677A Expired - Lifetime JPH07104455B2 (en) | 1987-09-03 | 1987-09-03 | Optical fiber high strength connection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07104455B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2895654B2 (en) * | 1991-02-20 | 1999-05-24 | 住友電気工業株式会社 | High strength connection method of optical fiber |
| JPH05264848A (en) * | 1992-03-19 | 1993-10-15 | Sumitomo Electric Ind Ltd | Method for reinforcing optical fiber juncture |
| US7314317B2 (en) | 2004-03-25 | 2008-01-01 | Kabushiki Kaisha Toshiba | Optical fiber connector and connecting method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6028321B2 (en) * | 1977-06-03 | 1985-07-04 | 日本電信電話株式会社 | Automatic fusion splicing method for glass fiber core wires for optical communications |
| JPS57200009A (en) * | 1981-06-03 | 1982-12-08 | Nippon Telegr & Teleph Corp <Ntt> | Connecting method for optical fiber |
| JPS60205407A (en) * | 1984-03-29 | 1985-10-17 | Furukawa Electric Co Ltd:The | Terminal part of coated optical fiber |
| JPS6152613A (en) * | 1984-08-23 | 1986-03-15 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber connecting method and connecting device |
-
1987
- 1987-09-03 JP JP62221677A patent/JPH07104455B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6463905A (en) | 1989-03-09 |
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