JPH0576003B2 - - Google Patents
Info
- Publication number
- JPH0576003B2 JPH0576003B2 JP62185190A JP18519087A JPH0576003B2 JP H0576003 B2 JPH0576003 B2 JP H0576003B2 JP 62185190 A JP62185190 A JP 62185190A JP 18519087 A JP18519087 A JP 18519087A JP H0576003 B2 JPH0576003 B2 JP H0576003B2
- Authority
- JP
- Japan
- Prior art keywords
- plastic
- optical fiber
- core
- fusion splicing
- cladding layer
- 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 - Fee Related
Links
- 239000004033 plastic Substances 0.000 claims description 58
- 229920003023 plastic Polymers 0.000 claims description 58
- 239000010410 layer Substances 0.000 claims description 51
- 239000013307 optical fiber Substances 0.000 claims description 47
- 238000005253 cladding Methods 0.000 claims description 39
- 238000007526 fusion splicing Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 27
- 230000004927 fusion Effects 0.000 claims description 14
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 239000011241 protective layer Substances 0.000 claims description 10
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 239000011737 fluorine Substances 0.000 claims description 8
- 238000002411 thermogravimetry Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000005304 optical glass Substances 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000011162 core material Substances 0.000 description 28
- 238000010586 diagram Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000002904 solvent Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 229920002050 silicone resin Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明プラスチツククラツド層を被覆したまま
でプラスチツククラツド光フアイバを融着接続で
きるプラスチツククラツド光フアイバの融着接続
方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for fusion splicing plastic clad optical fibers, which allows the fusion splicing of plastic clad optical fibers with a plastic clad layer covering the fibers.
（従来の技術）
第４図は従来のプラスチツククラツド光フアイ
バ（以下、PCFという）の端面を例示する図で
あり、コア１の周囲にプラスチツククラツド層
２、緩衝層３及び保護層４が順次被覆されてい
る。コア１は石英ガラスあるいは光学ガラスから
成り、プラスチツククラツド層２はコア１より低
屈折率の種々のプラスチツクスから成り、緩衝層
３はPCFに加わる外部応力を緩衝するものであ
つてシリコーン、ポリウレタン、アクリル系樹脂
等から成り、保護層４はナイロン、ポリエチレン
等熱可塑性樹脂から成つている。光透過性及び開
口数（NA）が優れていることから、シリコーン
樹脂及びフツ素含有樹脂がプラスチツククラツド
層２の材料として使用されている。PCFをコネ
クタ接続する際には例えば低温−20℃〜高温60℃
のヒートサイクル試験における所謂、光フアイバ
の追出しが問題となるために、コア１とプラスチ
ツククラツド層２の密着性、クラツド層２の硬
さ、クラツド層２とコネクタのフエルールとの接
着性が重要視され、最近はPCFのプラスチツク
クラツド層２の材料としてシリコーン樹脂よりも
フツ素含有樹脂が用いられる傾向にある。PCF
の接続は伝送距離が通常１Km以下と短いことから
一般にコネクタ接続が使用されているが、コネク
タ接続よりも高い信頼性と融着接続部のコンパク
ト化が要求される屋内光フアイバケーブルと屋外
光フアイバケーブルとの接続等には一般に公衆通
信用光フアイバで用いられている融着接続法が使
用される。(Prior Art) FIG. 4 is a diagram illustrating the end face of a conventional plastic clad optical fiber (hereinafter referred to as PCF), in which a plastic clad layer 2, a buffer layer 3 and a protective layer 4 are arranged around a core 1. coated sequentially. The core 1 is made of quartz glass or optical glass, the plastic clad layer 2 is made of various plastics with a lower refractive index than the core 1, and the buffer layer 3 is made of silicone, polyurethane, etc. to buffer external stress applied to the PCF. The protective layer 4 is made of a thermoplastic resin such as nylon or polyethylene. Silicone resins and fluorine-containing resins are used as materials for the plastic cladding layer 2 because of their excellent light transmission and numerical aperture (NA). When connecting the PCF with a connector, for example, low temperature -20℃ to high temperature 60℃
Since the so-called expulsion of the optical fiber becomes a problem in the heat cycle test, the adhesion between the core 1 and the plastic cladding layer 2, the hardness of the cladding layer 2, and the adhesion between the cladding layer 2 and the ferrule of the connector are important. Recently, there has been a tendency to use fluorine-containing resins rather than silicone resins as the material for the plastic cladding layer 2 of PCFs. PCF
Connector connections are generally used because the transmission distance is short, usually less than 1 km, but indoor optical fiber cables and outdoor optical fiber cables require higher reliability and a more compact fusion splice than connector connections. A fusion splicing method, which is generally used for optical fibers for public communications, is used for connection to cables.
第５図は従来の融着接続法を説明する図であ
る。この方法では、まず光フアイバの融着接続す
べき端部の保護層４及び緩衝層３を物理的又は化
学的に処理して除去してプラスチツククラツド層
２を露出させ、このプラスチツククラツド層２を
物理的、化学的又は熱的に処理して除去し、アル
コール等の溶剤を含ませたガーゼ、紙等でコア１
の表面を拭つて清浄にする。次に、清浄にした各
光フアイバの接続端面を鏡面仕上げし放電電極
５，５の位置に一致させて対接させ、放電電極
５，５間にアーク放電によりアーク炎６を発生さ
せ、この熱により対接させたコア１を局部的に溶
かし瞬時に両方のコア１を融着接続する。この融
着接続部にはコア１より低屈折率のレジンがコア
１に塗布された後補強部材を介在させて外側から
熱収縮チユーブが被せられて補強される。この従
来の融着接続法では、光フアイバの端部のプラス
チツククラツド層２の除去は、一般に、溶剤で溶
かすかあるいは有機溶剤で膨潤させて剥離したも
のを拭きとる方法、加熱劣化あるいは熱分解によ
り除去する方法、及びナイフ等の工具により削除
する方法により行われている。 FIG. 5 is a diagram illustrating a conventional fusion splicing method. In this method, first, the protective layer 4 and the buffer layer 3 at the ends of the optical fibers to be fused are removed by physical or chemical treatment to expose the plastic cladding layer 2. 2 is removed by physical, chemical or thermal treatment, and the core 1 is removed with gauze, paper, etc. soaked in a solvent such as alcohol.
Clean the surface by wiping it. Next, the connection end surface of each cleaned optical fiber is finished to a mirror finish and brought into contact with the discharge electrodes 5, 5, so that an arc flame 6 is generated by arc discharge between the discharge electrodes 5, 5. The cores 1 that are brought into contact with each other are locally melted and both cores 1 are instantaneously fused and spliced. After a resin having a refractive index lower than that of the core 1 is applied to the fusion spliced portion, a reinforcing member is interposed and a heat-shrinkable tube is covered from the outside for reinforcement. In this conventional fusion splicing method, the plastic cladding layer 2 at the end of the optical fiber is generally removed by dissolving it with a solvent, swelling it with an organic solvent and wiping off the peeled material, heating aging or thermal decomposition. This method is performed by removing with a knife or by using a tool such as a knife.
（発明が解決しようとする問題点）
しかしながら、光フアイバのコア１とプラスチ
ツククラツド層２の密着性が向上したために融着
接続の際の光フアイバの端部のプラスチツククラ
ツド層２の除去が難しくなつてきている。前述の
溶剤を用いる方法では架橋後の溶剤に適当なもの
がなくまた作業性及び安全性が不十分であり、熱
により除去する方法では危険である上に加熱劣化
により光フアイバが極めて脆くなり、また工具を
用いる方法ではコア１の表面が傷つけられ、その
ため接続損失が増したり、強度が劣化するという
問題点があつた。(Problems to be Solved by the Invention) However, since the adhesion between the core 1 and the plastic cladding layer 2 of the optical fiber has improved, it is difficult to remove the plastic cladding layer 2 at the end of the optical fiber during fusion splicing. It's getting difficult. The above-mentioned method using a solvent does not have a suitable solvent after cross-linking, and the workability and safety are insufficient, and the method of removing it by heat is not only dangerous, but also causes the optical fiber to become extremely brittle due to thermal deterioration. Further, the method using a tool has the problem that the surface of the core 1 is damaged, which increases connection loss and deteriorates strength.
本発明は上記事情に鑑みてなされたもので、プ
ラスチツククラツド層の材料を選択することによ
り、光フアイバのコアプラスチツククラツド層を
被覆したまま除去せずにに光フアイバの融着接続
を可能にするプラスチツククラツド光フアイバの
融着接続方法を提供することを目的とする。 The present invention was made in view of the above circumstances, and by selecting the material for the plastic cladding layer, it is possible to fusion splice optical fibers without removing the core plastic cladding layer of the optical fiber. It is an object of the present invention to provide a method for fusion splicing plastic-clad optical fibers.
（問題点を解決するための手段）
上記目的を達成するために本発明によれば、光
学ガラスをコアとし、プラスチツクをクラツドと
するプラスツチツククラツド光フアイバを気中放
電により融着して接続するプラスチツククラツド
光フアイバの融着接続方法において、プラスチツ
ククラツド層がフツ素含有樹脂であつて熱重量分
析による熱分解残渣が10％以下のものから成るプ
ラスチツククラツド光フアイバを選択し、前記光
フアイバの保護層及び緩衝層を除去し、前記コア
に前記プラスチツククラツド層が被覆されたまま
で前記光フアイバの融着接続部を対接し加熱する
ことにより前記プラスチツククラツド層の熱分解
除去及び前記コアの融着接続を行うプラスチツク
クラツド光フアイバの融着接続方法が提供され
る。(Means for Solving the Problems) In order to achieve the above object, according to the present invention, plastic clad optical fibers having an optical glass core and a plastic cladding are fused and connected by air discharge. In the fusion splicing method of a plastic-clad optical fiber, a plastic-clad optical fiber whose plastic clad layer is made of a fluorine-containing resin and has a thermal decomposition residue of 10% or less as determined by thermogravimetric analysis is selected; The protective layer and the buffer layer of the optical fiber are removed, and the plastic cladding layer is thermally decomposed by heating the fusion spliced portion of the optical fiber while the core remains covered with the plastic cladding layer. A method of fusion splicing a plastic clad optical fiber for fusion splicing the core is provided.
（作用）
本発明では、コアにプラスチツククラツド層を
被覆したままで気中放電により光フアイバの融着
接続部を加熱し、プラスチツククラツド層の熱分
解除去及びコアの融着接続を行う。このため、光
フアイバのプラスチツククラツド層の材料に一定
の条件が課せられる。(Function) In the present invention, the fusion splicing portion of the optical fiber is heated by air discharge while the core is covered with the plastic cladding layer, and the plastic cladding layer is removed by thermal decomposition and the core is fusion spliced. For this reason, certain requirements are imposed on the material of the plastic cladding layer of the optical fiber.
（実施例）
以下、本発明の実施例を添付図面に基づいて詳
細に説明する。(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.
第１図は本発明のプラスチツククラツド光フア
イバの融着接続方法を説明する図である。この融
着接続方法は光フアイバから緩衝層３及び保護層
４を除去するがプラスチツククラツド層２をコア
１に被覆したままで光フアイバの融着接続部を対
接し、プラスチツククラツド層２の上から放電電
極５，５のアーク炎６によりコア１を加熱してプ
ラスチツククラツド層２をきれいに熱分解すると
同時に融着接続を行うかあるいは熱分解した後に
融解着接続を行おうとするものである。アーク炎
６は1800℃以上の温度でありプラスチツククラツ
ド層２の熱分解温度としては十分である。 FIG. 1 is a diagram illustrating a method for fusion splicing plastic-clad optical fibers according to the present invention. In this fusion splicing method, the buffer layer 3 and the protective layer 4 are removed from the optical fiber, but the fusion spliced portions of the optical fibers are brought into contact with each other with the plastic cladding layer 2 still covering the core 1. The core 1 is heated from above by the arc flame 6 of the discharge electrodes 5, 5, and the plastic cladding layer 2 is thermally decomposed cleanly, and fusion splicing is performed at the same time, or fusion splicing is performed after pyrolysis. . The arc flame 6 has a temperature of 1800° C. or higher, which is sufficient to thermally decompose the plastic cladding layer 2.
本発明に適合するプラスチツクラツド材料の組
成および熱的特性について検討する。シリコーン
は最も一般的なクラツド材料であるが、加熱する
と熱分解してSiO2の薄片（フレーク）が発生し、
この薄片がコア１の表面に付着あるいは融着して
コア１の表面の不整を起こし光を散乱させるので
本発明の融着接続方法には適合しないことは明ら
かである。また、発明者がフツ素含有樹脂のうち
石英よりも屈折率の低いものについて実験検討し
た結果、特開昭62−7006に開示されているフルオ
ロポリシロキサンのように分子構造内にケイ素等
を有し、加熱により酸化物残渣を生成するような
組成のフツ素含有樹脂も本発明の融着接続方法に
は適合しないことがわかつた。 The composition and thermal properties of plastics materials compatible with the present invention will be discussed. Silicone is the most common cladding material, but when heated it thermally decomposes and produces SiO 2 flakes.
It is clear that this thin piece is not suitable for the fusion splicing method of the present invention because it adheres or fuses to the surface of the core 1, causing irregularities in the surface of the core 1 and scattering light. In addition, as a result of the inventor's experimental studies on fluorine-containing resins that have a lower refractive index than quartz, he found that they contain silicon, etc. in their molecular structure, such as fluoropolysiloxane disclosed in JP-A-62-7006. However, it has been found that fluorine-containing resins having compositions that produce oxide residues upon heating are also not compatible with the fusion splicing method of the present invention.
第２図はメタアクリル酸ヘキサオロアルキルの
熱重量分析の結果を示す図である。このメタアク
リル酸ヘキサフルオロアルキル4.7mgを毎分10℃
の温度上昇速度で加熱した結果、このレジンは約
270℃で熱分解反応を開始し急速に反応して約360
℃で熱分解反応を終了した。終了時点では重量パ
ーセントで97％以上が分解して消失していること
がわかる。つまり、このレジンは加熱により。
H2Ｏ，CO，CO2，CF4等のガスとなつて蒸発し
てしまい、炭素等が煤となつて殆ど残留しない性
質のものである。発明者の検討によれば、熱重量
分析による熱分解残渣が10％以下のレジンが本発
明の融着接続方法に適することがわかつた。 FIG. 2 is a diagram showing the results of thermogravimetric analysis of hexaoloalkyl methacrylate. 4.7 mg of this hexafluoroalkyl methacrylate at 10°C per minute.
As a result of heating at a temperature increase rate of approximately
Thermal decomposition reaction starts at 270℃ and reacts rapidly to about 360℃.
The thermal decomposition reaction was completed at ℃. It can be seen that at the end of the process, more than 97% by weight had decomposed and disappeared. In other words, this resin is heated.
It evaporates into gases such as H 2 O, CO, CO 2 and CF 4 , and carbon, etc. becomes soot and hardly remains. According to the inventor's study, it was found that a resin having a thermal decomposition residue of 10% or less as determined by thermogravimetric analysis is suitable for the fusion splicing method of the present invention.
次に、プラスチツククラツド層２の膜厚につい
て検討する。放電電極５，５の融着時の放電時間
は一般に数秒から10秒位と短く、また光フアイバ
の温度は融着接続部の端面から遠くなるに従つて
低下する。このため、プラスチツククラツド層２
の膜厚が厚すぎるとつまり熱分解すべきレジンの
量が多すぎると、第３図に示すように熱分解領域
と未分解領域の境界で完全に熱分解されないカー
ボンの媒等の熱分解残渣８が発生することがあ
る。この熱分解残渣８は光の散乱を生じ、接続損
失の原因となる。従つて、プラスチツククラツド
層２の膜厚は厚すぎないことが必要であるが、発
明者の検討により膜厚30μｍ以下が適当であるこ
とがわかつた。 Next, the thickness of the plastic cladding layer 2 will be discussed. The discharge time during fusion of the discharge electrodes 5, 5 is generally short, from several seconds to about 10 seconds, and the temperature of the optical fiber decreases as it gets farther from the end face of the fusion splice. Therefore, the plastic cladding layer 2
If the film thickness is too thick, that is, if the amount of resin to be thermally decomposed is too large, thermal decomposition residues such as carbon media will not be completely thermally decomposed at the boundary between the thermally decomposed area and the undecomposed area, as shown in Figure 3. 8 may occur. This thermal decomposition residue 8 causes light scattering and causes connection loss. Therefore, it is necessary that the plastic cladding layer 2 be not too thick, but the inventor's studies have revealed that a thickness of 30 μm or less is appropriate.
このように、本発明のプラスチツククラツド光
フアイバの融着接続方法は、フツ素含有樹脂のう
ちコアの材料よりも屈折率が低くかつ組成的に熱
重量分析による熱分解残渣が一定量以下しか生成
されないものによつて、一定厚さ以下の膜厚で被
覆されたプラスチツククラツド層を有する光フア
イバに適用される。 As described above, the method for fusion splicing plastic-clad optical fibers of the present invention is a fluorine-containing resin that has a lower refractive index than the core material and has a composition that only contains less than a certain amount of thermal decomposition residue as determined by thermogravimetric analysis. It is applied to optical fibers having a plastic cladding layer coated with a film thickness below a certain thickness by those not produced.
実施例 １
PCFは石英ロツドの母材を線引きした外径
200μｍとコア１と、このコア１の表面にコーテ
イングされた厚さ220μｍ〜300μｍのメタアクリ
ル酸ヘキサフルオロアルキルから成るプラスチツ
ククラツド層２と、その表面にコーテイングされ
た厚さ300μｍ〜380μｍのシリコーン樹脂の緩衝
層３と、この緩衝層３の表面に直径0.9mmまで被
覆されたナイロンの保護層４とから構成されてい
る。長さ200ｍと長さ300ｍのPCFを用意し、そ
れぞれのPCFの一方の端部の保護層４及び緩衝
層３をワイヤストリツパで除去してプラスチツク
クラツド層２を露出させ、フアイバカツタを用い
てフアイバの融着接続部の端面を鏡面仕上げした
後プラスチツククラツド層２を被覆したまま端部
を対接させて保持する。次に、放電電極５，５間
にアーク炎６を約８秒間発生させPCFの端部を
融着接続し、長さ500ｍのPCFを10本作製した。
波長0.85μｍの光に対する各PCFの接続損失を測
定した結果、接続損失は接続直後のエアクラツド
の状態で平均0.06dB程度で極めて低損失であり、
また融着接続後にクラツド層の塗布及び補強につ
いて実用的処理を施した状態で平均0.2dBであつ
て、本発明の融着接続方法が十分に実用に供し得
ることがわかつた。Example 1 PCF is the outer diameter of the quartz rod base material.
a plastic clad layer 2 made of hexafluoroalkyl methacrylate with a thickness of 220 μm to 300 μm coated on the surface of the core 1, and a silicone resin coated on the surface with a thickness of 300 μm to 380 μm. , and a nylon protective layer 4 coated on the surface of the buffer layer 3 to a diameter of 0.9 mm. Prepare PCFs with a length of 200 m and a length of 300 m, remove the protective layer 4 and buffer layer 3 at one end of each PCF with a wire stripper to expose the plastic cladding layer 2, and then remove the fiber using a fiber cutter. After mirror-finishing the end faces of the fusion splice, the ends are held facing each other while being covered with the plastic cladding layer 2. Next, an arc flame 6 was generated between the discharge electrodes 5 for about 8 seconds, and the ends of the PCF were fused and spliced to produce 10 PCFs each having a length of 500 m.
As a result of measuring the connection loss of each PCF for light with a wavelength of 0.85μm, the connection loss was extremely low with an average of about 0.06dB in the air-clad state immediately after connection.
Furthermore, the average value was 0.2 dB after practical treatment was applied to the coating and reinforcement of the cladding layer after fusion splicing, indicating that the fusion splicing method of the present invention can be fully put to practical use.
実施例 ２
PCFはプラスチツククラツド層２としてポリ
フツ化ビニリデンを用いたこと以外は実施例１の
PCFと同じである。長さ200ｍと長さ300ｍのこ
のPCFを実施例１と同様に融着接続して同様に
接続損失を測定した結果、接続損失は接続直後の
エアクラツドの状態で平均0.07dBであり、補強
処理後の状態で平均0.3dBであつた。ポリフツ化
ビニリデンの熱分解残渣は重量パーセントで８％
であつた。Example 2 The PCF was the same as in Example 1 except that polyvinylidene fluoride was used as the plastic cladding layer 2.
Same as PCF. These PCFs with lengths of 200 m and 300 m were fusion spliced in the same manner as in Example 1, and the splice loss was measured in the same manner. As a result, the splice loss was an average of 0.07 dB in the air clad state immediately after splicing, and after the reinforcement treatment. The average value was 0.3 dB under these conditions. The thermal decomposition residue of polyvinylidene fluoride is 8% by weight.
It was hot.
（発明の効果）
以上説明したように、本発明によれば、光学ガ
ラスをコアとし、プラスチツクをクラツドとする
プラスチツククラツド光フアイバを気中放電によ
り融着して接続するプラスチツククラツド光フア
イバの融着接続方法において、コアが石英から成
りプラスチツククラツド層がフツ素含有樹脂であ
つて熱重量分析による熱分解残渣が10％以下のも
のから成るプラスチツククラツド光フアイバを選
択し、前記光フアイバの保護層及び緩衝層を除去
し、前記コアに前記プラスチツククラツド層が被
覆されたままで前記光フアイバの融着接続部を対
接し加熱することにより、プラスチツククラツド
層を除去する必要がないため作業性が向上できそ
のため接続コストが低減でき、気中放電以外に
熱、溶剤を使用しないため作業に危険性がなく、
コアの表面が傷つけられることがないため接続損
失が増加せずまた強度も低下せずそのため融着接
続部の信頼性が向上できるという効果が得られ
る。(Effects of the Invention) As explained above, according to the present invention, a plastic clad optical fiber having an optical glass core and a plastic cladding is fused and connected by air discharge. In the fusion splicing method, a plastic clad optical fiber having a core made of quartz, a plastic clad layer made of a fluorine-containing resin, and having a thermal decomposition residue of 10% or less as determined by thermogravimetric analysis is selected, and the optical fiber is There is no need to remove the plastic cladding layer by removing the protective layer and buffer layer of the optical fiber and heating the fusion spliced portion of the optical fiber while the core remains coated with the plastic cladding layer. Workability is improved, which reduces connection costs, and since no heat or solvent is used other than air discharge, there is no danger in the work.
Since the surface of the core is not damaged, the splice loss does not increase and the strength does not decrease, resulting in the effect that the reliability of the fusion splice can be improved.
第１図は本発明のプラスチツククラツド光フア
イバの融着接続方法を説明する図、第２図はメタ
アクリル酸ヘキサフルオロアルキの熱重量分析の
結果を示す図、第３図は融着接続後のプラスチツ
ククラツド光フアイバを示す図、第４図は従来の
プラスチツククラツド光フアイバの端面を例示す
る図、第５図は従来のプラスチツククラツド光フ
アイバの融着接続方法を説明する図である。
１……コア、２……プラスチツククラツド層、
３……緩衝層、４……保護層、５……放電電極、
６……アーク炎、７……コア接続部、８……熱分
解残渣。
Fig. 1 is a diagram explaining the fusion splicing method of plastic clad optical fiber of the present invention, Fig. 2 is a diagram showing the results of thermogravimetric analysis of hexafluoroalkyl methacrylate, and Fig. 3 is a diagram after fusion splicing. 4 is a diagram illustrating an end face of a conventional plastic clad optical fiber, and FIG. 5 is a diagram illustrating a conventional fusion splicing method for plastic clad optical fiber. . 1...Core, 2...Plastic cladding layer,
3... Buffer layer, 4... Protective layer, 5... Discharge electrode,
6... Arc flame, 7... Core connection, 8... Pyrolysis residue.
Claims (1)
ツドとするプラスツチツククラツド光フアイバを
気中放電により融着して接続するプラスチツクク
ラツド光フアイバ融着接続方法において、プラス
チツククラツド層がフツ素含有樹脂であつて熱重
量分析による熱分解残渣が10％以下のものから成
るプラスチツククラツド光フアイバを選択し、前
記光フアイバの保護層及び緩衝層を除去し、前記
コアに前記プラスチツククラツド層が被覆された
ままで前記光フアイバの融着接続部を対接し加熱
することにより前記プラスチツククラツド層の熱
分解除去及び前記コアの融着接続を行うことを特
徴とするプラスチツククラツド光フアイバの融着
接続方法。 ２ 前記プラスチツククラツド層の熱分解除去と
前記コアの融着接続とが同時に行われるかあるい
は熱分解除去後に融着接続が行われることを特徴
とする特許請求の範囲第１項記載のプラスチツク
クラツド光フアイバの融着接続方法。 ３ 前記プラスチツククラツド層がメタアクリル
酸ヘキサフルオロアルキルあるいはポリフツ化ビ
ニリデンから成る光フアイバを選択することを特
徴とする特許請求の範囲第１項記載のプラスチツ
ククラツド光フアイバの融着接続方法。[Claims] 1. In a plastic clad optical fiber fusion splicing method in which plastic clad optical fibers having an optical glass core and a plastic cladding are fused and spliced by air discharge, the plastic cladding layer A plastic-clad optical fiber made of a fluorine-containing resin with a thermal decomposition residue of 10% or less as determined by thermogravimetric analysis is selected, the protective layer and buffer layer of the optical fiber are removed, and the core is coated with the plastic. A plastic clad optical fiber, characterized in that the plastic cladding layer is removed by thermal decomposition and the core is fusion spliced by heating the fusion spliced portion of the optical fiber while the cladding layer remains covered. Fiber fusion splicing method. 2. The plastic cladding according to claim 1, wherein the pyrolytic removal of the plastic cladding layer and the fusion splicing of the core are performed simultaneously or the fusion splicing is performed after the pyrolytic removal. Fusion splicing method for optical fibers. 3. A method for fusion splicing plastic clad optical fibers according to claim 1, wherein said plastic clad layer is an optical fiber made of hexafluoroalkyl methacrylate or polyvinylidene fluoride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18519087A JPS6429807A (en) | 1987-07-24 | 1987-07-24 | Fusion connecting method for plastic clad optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18519087A JPS6429807A (en) | 1987-07-24 | 1987-07-24 | Fusion connecting method for plastic clad optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6429807A JPS6429807A (en) | 1989-01-31 |
| JPH0576003B2 true JPH0576003B2 (en) | 1993-10-21 |
Family
ID=16166430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18519087A Granted JPS6429807A (en) | 1987-07-24 | 1987-07-24 | Fusion connecting method for plastic clad optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6429807A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0684265B2 (en) * | 1988-06-03 | 1994-10-26 | 日立金属株式会社 | Aluminum nitride sintered body |
| JP4974165B2 (en) * | 2007-08-27 | 2012-07-11 | 古河電気工業株式会社 | Manufacturing method of optical fiber connection structure |
| JP4982330B2 (en) * | 2007-11-02 | 2012-07-25 | 株式会社フジクラ | Optical fiber fusion splicing structure, residual pumping light removal method, optical amplifier and optical fiber laser |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52120848A (en) * | 1976-04-03 | 1977-10-11 | Nippon Telegr & Teleph Corp <Ntt> | Welding method for optical fiber |
| JPS5474452A (en) * | 1977-11-26 | 1979-06-14 | Fujikura Ltd | End treating method of optical fiber having plastic cladding |
| JPS56116009A (en) * | 1980-02-19 | 1981-09-11 | Fujitsu Ltd | Mold core |
| JPS57188006A (en) * | 1981-05-15 | 1982-11-18 | Nippon Telegr & Teleph Corp <Ntt> | Connecting method of optical fiber by melt-sticking |
| JPS60260904A (en) * | 1984-06-08 | 1985-12-24 | Mitsubishi Rayon Co Ltd | Treatment of end face of plastic optical fiber |
| JPS61259207A (en) * | 1985-05-14 | 1986-11-17 | Mitsubishi Rayon Co Ltd | Optical conductor and its production and cylinder body used therfor |
-
1987
- 1987-07-24 JP JP18519087A patent/JPS6429807A/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52120848A (en) * | 1976-04-03 | 1977-10-11 | Nippon Telegr & Teleph Corp <Ntt> | Welding method for optical fiber |
| JPS5474452A (en) * | 1977-11-26 | 1979-06-14 | Fujikura Ltd | End treating method of optical fiber having plastic cladding |
| JPS56116009A (en) * | 1980-02-19 | 1981-09-11 | Fujitsu Ltd | Mold core |
| JPS57188006A (en) * | 1981-05-15 | 1982-11-18 | Nippon Telegr & Teleph Corp <Ntt> | Connecting method of optical fiber by melt-sticking |
| JPS60260904A (en) * | 1984-06-08 | 1985-12-24 | Mitsubishi Rayon Co Ltd | Treatment of end face of plastic optical fiber |
| JPS61259207A (en) * | 1985-05-14 | 1986-11-17 | Mitsubishi Rayon Co Ltd | Optical conductor and its production and cylinder body used therfor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6429807A (en) | 1989-01-31 |
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