JPH0563766B2 - - Google Patents
Info
- Publication number
- JPH0563766B2 JPH0563766B2 JP59074756A JP7475684A JPH0563766B2 JP H0563766 B2 JPH0563766 B2 JP H0563766B2 JP 59074756 A JP59074756 A JP 59074756A JP 7475684 A JP7475684 A JP 7475684A JP H0563766 B2 JPH0563766 B2 JP H0563766B2
- Authority
- JP
- Japan
- Prior art keywords
- pushing
- optical fiber
- optical fibers
- discharge
- speed
- 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 claims description 30
- 238000000034 method Methods 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 5
- 238000007526 fusion splicing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は光フアイバの融着接続に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to fusion splicing of optical fibers.
（従来技術とその問題点）
従来、光フアイバの接続は、第１図に示すよう
に被覆を除去した裸光フアイバを互いに対向さ
せ、予備放電を行つた後一定の速度で押し込み、
押し込み完了後も更に放電を行つて融着を完了し
ている。本方式では被覆を熱硫酸等で化学的に除
去し、裸フアイバ表面に傷をつけない状態、例え
ば被覆部をクランプして融着接続しても、強度が
２〜３Kg程度で、通常の裸フアイバ部強度の５〜
６Kgと比較すると半分以下に低下しているという
欠点を有していた。(Prior art and its problems) Conventionally, optical fibers are connected by placing bare optical fibers with their coatings removed and facing each other as shown in FIG.
Even after the pushing is completed, electric discharge is further performed to complete the fusion. In this method, the coating is chemically removed with hot sulfuric acid, etc., and even if the bare fiber surface is not damaged, for example, even if the coating is clamped and fusion spliced, the strength is about 2 to 3 kg, and the strength is about 2 to 3 kg. Fiber part strength 5~
It had the disadvantage that it was less than half the weight compared to 6Kg.
（発明の構成）
本発明は上記の欠点を克服し理想的、高強度な
融着接続方法を提供するものである。(Structure of the Invention) The present invention overcomes the above-mentioned drawbacks and provides an ideal, high-strength fusion splicing method.
本発明は従来、押し込みが一定速度で一度で完
了していたのに対して、次のようなことが異なつ
ている。すなわち、裸光フアイバ同志を突き合わ
せた後、予備放電後一方の光フアイバを他方に押
し込むが、このときの初速度Ａにより長さL1押
し込んだ後、速度Ｂに減速し更に長さL2押し込
む。この場合L2＝l1＋l2で与えられるとして、主
放電はl1終了と同時に完了する。すなわちl2の押
し込みは、主放電終了後に生じている。その時間
は第２図のｔで示している。 The present invention differs from the conventional method in which pushing was completed in one go at a constant speed, as follows. That is, after the bare optical fibers are butted against each other, one optical fiber is pushed into the other after a preliminary discharge, but after pushing in a length L 1 at the initial speed A at this time, it is decelerated to speed B and pushed further a length L 2 . . In this case, assuming that L 2 =l 1 +l 2 is given, the main discharge is completed at the same time as l 1 ends. In other words, the l 2 push-in occurs after the main discharge ends. The time is indicated by t in FIG.
以上説明したように、本発明の特徴は、光フア
イバの押し込み量に対応して、押し込み速度が変
化する点にあり、実験によると押し込み速度Ａは
速度Ｂよりも大きいのが好ましい。また、説明で
は速度Ａ，Ｂの２段階速度変化について説明した
が、押し込み速度を移動量に対応して、なめらか
に変化させてもよい。更に、L2の押し込みにお
いて、l1とl2も同速度にせず、l2の押し込み時に
速度を更に変更して、速度Ｃなる値にしてもよ
い。 As explained above, the feature of the present invention is that the pushing speed changes depending on the pushing amount of the optical fiber, and according to experiments, pushing speed A is preferably larger than speed B. Further, in the explanation, a two-step speed change of speeds A and B has been described, but the pushing speed may be changed smoothly in accordance with the amount of movement. Furthermore, when pushing L2 , l1 and l2 may not be set at the same speed, but the speed may be further changed when pushing l2 to a value of speed C.
（実施例）
光フアイバ心線の被覆を熱硫酸で約10mm除去し
た後、互いに対向させ、被覆部をクランプした。
互いの光フアイバを10μｍ離した位置で光フアイ
バの軸調心を行つた後、予備放電を約0.2秒行い、
その後、主放電にうつるとともに、一方の光フア
イバを押し込み速度150μｍ／secで約20μｍ押し
込み、更に押し込み速度を5μｍ／secに減速して
10μｍ押し込み、この時点で主放電を停止させ、
放電停止後も同速度で1μｍ押し込んで融着接続
を完了した。主放電時間は約2.2秒で完了する。(Example) After about 10 mm of the coating of the optical fiber core wire was removed with hot sulfuric acid, the coated portions were clamped while facing each other.
After aligning the optical fibers at a position 10 μm apart from each other, a preliminary discharge was performed for about 0.2 seconds, and
Then, as the main discharge progresses, one optical fiber is pushed in about 20 μm at a pushing speed of 150 μm/sec, and the pushing speed is further reduced to 5 μm/sec.
Push in 10μm, stop the main discharge at this point,
Even after the discharge stopped, the fusion splice was completed by pushing in 1 μm at the same speed. The main discharge time is completed in approximately 2.2 seconds.
（発明の効果）
本発明の方法を利用することにより、従来この
ような押し込み速度の変化を考慮しなかつた方法
が接続部強度平均２〜３Kgであるのに対して、試
験サンプル数＝20で平均3.8Kgに向上した。また、
従来方法では試験サンプル数＝50の最大値が3.9
Kgに対して、今回は最大値が5.3Kgに達しており、
一般の裸光フアイバとほゞ同等なレベルまで強度
が向上した。さらに、光フアイバの押し込み完了
前に放電停止する、すなわち放電終了後も光フア
イバを微小量押し込むことにより冷却過程におい
て光フアイバに発生する応力が緩和されるので、
熱歪あるいはクラツクも抑制でき、強度の向上が
はかれる。(Effects of the Invention) By using the method of the present invention, the average connection strength is 2 to 3 kg using the conventional method that does not take into account such changes in pushing speed, whereas the number of test samples = 20. The average weight improved to 3.8Kg. Also,
In the conventional method, the maximum value for the number of test samples = 50 is 3.9
Kg, this time the maximum value reached 5.3Kg,
The strength has been improved to a level almost equivalent to that of ordinary bare optical fiber. Furthermore, by stopping the discharge before the optical fiber is completely pushed in, that is, by pushing the optical fiber a minute amount even after the discharge is finished, the stress generated in the optical fiber during the cooling process is alleviated.
Thermal strain or cracking can also be suppressed, and strength can be improved.
このような効果の原因に関しては、従来押し込
み速度が一定で、かつ一度押し込んで終了してい
た場合、更に放電をつゞけることにより、光フア
イバガラス表面層になんらかの熱歪もしくは冷却
時にクラツクの発生が生じていると考えられ、本
発明のように連続して、かつ光フアイバガラス溶
融状態に適した押し込みを行うことにより、熱歪
もしくは冷却時のクラツク発生を防止することが
可能となり、高強度接続が達成できると推定され
る。すなわち、押し込み速度、押し込み量につい
ては、放電電流等とも密接に関係しており、今回
の値は一例にすぎない。しかし、いずれにせよ加
熱をしている間は、連続して押し込むことが重要
で溶融状態すなわち、押し込み長さに依存して、
適性な押し込み速度に変化、対応させることが、
高強度融着実現の方法として、きわめて重要なこ
とである。 Regarding the cause of this effect, if the pushing speed was conventionally constant and the pushing was completed once, further discharge may cause some kind of thermal distortion in the optical fiber glass surface layer or cracks may occur during cooling. It is thought that this occurs, and by performing continuous pushing as in the present invention and in an appropriate manner to the molten state of the optical fiber glass, it is possible to prevent thermal distortion or cracks during cooling, resulting in high strength. It is estimated that connectivity can be achieved. That is, the pushing speed and the pushing amount are closely related to the discharge current, etc., and the values shown here are just examples. However, in any case, it is important to press continuously while heating.
It is possible to change and correspond to the appropriate pushing speed.
This is extremely important as a method of achieving high strength fusion.
第１図は従来の、第２図は本発明のそれぞれ光
フアイバの融着接続方法の説明図である。第１
図、第２図共に縦軸は接続すべき光フアイバの端
面間隔、横軸は時間（放電時間）を示す。第２図
においてL1＋L2＝全押し込み量（全移動量）、L2
＝l1＋l2で、L1は速度Ａでの押し込み量、L2は速
度Ｂで押し込む量、l1は主放電完了時の押し込み
量、l2は放電完了後の押し込み量、ｔは主放電終
了後の押し込み時間である。
FIG. 1 is an explanatory diagram of a conventional method of fusion splicing optical fibers, and FIG. 2 is an explanatory diagram of a method of fusion splicing optical fibers according to the present invention. 1st
In both FIG. 2 and FIG. 2, the vertical axis shows the distance between the end faces of the optical fibers to be connected, and the horizontal axis shows time (discharge time). In Figure 2, L 1 + L 2 = total push amount (total travel amount), L 2
= l 1 + l 2 , where L 1 is the pushing amount at speed A, L 2 is the pushing amount at speed B, l 1 is the pushing amount at the completion of the main discharge, l 2 is the pushing amount after the completion of the discharge, and t is the main pushing amount. This is the pushing time after the end of discharge.
Claims (1)
バの接続端部を相互に一定距離はなして突き合わ
せ、この裸光フアイバの接続端部を予備放電によ
り加熱した後、一方の光フアイバを他方の光フア
イバに対向して移動させ、主放電の加熱により溶
融状態の両光フアイバを接着し、さらに一方の光
フアイバを他方の光フアイバに押し込み、然る後
全放電を停止してなる光フアイバ融着接続方法に
おいて、光フアイバの押し込みは押し込みが終了
するまで連続して行われ、かつ、押し込み速度が
光フアイバを押し込むにつれて段階的に遅くなつ
ており、光フアイバの押し込みが完了する以前に
主放電が停止していることを特徴とする光フアイ
バの融着接続方法。1 Remove the coating of the optical fibers, butt the connecting ends of the bare optical fibers at a certain distance from each other, heat the connecting ends of the bare optical fibers by preliminary discharge, and then connect one optical fiber to the other. The optical fibers are moved opposite to each other, the two optical fibers in a molten state are bonded together by the heating of the main discharge, and one optical fiber is further pushed into the other optical fiber, and then the entire discharge is stopped. In the splicing method, the optical fiber is continuously pushed in until the pushing is completed, and the pushing speed is gradually slowed down as the optical fiber is pushed in, and the main discharge occurs before the optical fiber is pushed in. A method for fusion splicing optical fibers, characterized in that: is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7475684A JPS60217311A (en) | 1984-04-12 | 1984-04-12 | Welding and connecting method of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7475684A JPS60217311A (en) | 1984-04-12 | 1984-04-12 | Welding and connecting method of optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60217311A JPS60217311A (en) | 1985-10-30 |
| JPH0563766B2 true JPH0563766B2 (en) | 1993-09-13 |
Family
ID=13556430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7475684A Granted JPS60217311A (en) | 1984-04-12 | 1984-04-12 | Welding and connecting method of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60217311A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9418878D0 (en) * | 1994-09-20 | 1994-11-09 | Bicc Plc | Optical cable fusion splice |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS578511A (en) * | 1980-06-17 | 1982-01-16 | Nippon Telegr & Teleph Corp <Ntt> | Connecting method for optical fiber |
| JPS5746219A (en) * | 1980-09-05 | 1982-03-16 | Nippon Telegr & Teleph Corp <Ntt> | Axis aligning method of optical fiber |
| JPS5781223A (en) * | 1980-11-11 | 1982-05-21 | Nippon Telegr & Teleph Corp <Ntt> | Melt connector for optical fiber |
| JPS59228216A (en) * | 1983-06-09 | 1984-12-21 | Furukawa Electric Co Ltd:The | Aligning method of optical fiber |
-
1984
- 1984-04-12 JP JP7475684A patent/JPS60217311A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS578511A (en) * | 1980-06-17 | 1982-01-16 | Nippon Telegr & Teleph Corp <Ntt> | Connecting method for optical fiber |
| JPS5746219A (en) * | 1980-09-05 | 1982-03-16 | Nippon Telegr & Teleph Corp <Ntt> | Axis aligning method of optical fiber |
| JPS5781223A (en) * | 1980-11-11 | 1982-05-21 | Nippon Telegr & Teleph Corp <Ntt> | Melt connector for optical fiber |
| JPS59228216A (en) * | 1983-06-09 | 1984-12-21 | Furukawa Electric Co Ltd:The | Aligning method of optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60217311A (en) | 1985-10-30 |
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