JP2000034137A - Production of optical fiber - Google Patents
Production of optical fiberInfo
- Publication number
- JP2000034137A JP2000034137A JP10204099A JP20409998A JP2000034137A JP 2000034137 A JP2000034137 A JP 2000034137A JP 10204099 A JP10204099 A JP 10204099A JP 20409998 A JP20409998 A JP 20409998A JP 2000034137 A JP2000034137 A JP 2000034137A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- bare optical
- coating layer
- moisture
- containing gas
- 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.)
- Granted
Links
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は光ファイバ素線の製
造方法に関し、特に裸光ファイバと被覆層との密着性を
改善したものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an optical fiber, and more particularly to a method for improving the adhesion between a bare optical fiber and a coating layer.
【０００２】[0002]
【従来の技術】光ファイバ素線は、通常石英系ガラスか
らなる裸光ファイバを合成樹脂液（以下樹脂液と略記す
る）でコーティングして、これを硬化させることによ
り、前記裸光ファイバの外周上に合成樹脂製の被覆層を
設けたものである。光ファイバ素線においては、裸光フ
ァイバと被覆層との密着性が温度特性などの環境特性や
取扱い性に大きく影響する。この密着性の指標として
は、引き抜き力が用いられる。図２は引き抜き力の測定
方法の一例を示したものである。すなわち、まず裸光フ
ァイバ１１ａと被覆層１１ｂとからなる光ファイバ素線
１１の一方の先端１２の被覆層１１ｂを一部除去する。
この先端１２を下方に配置して光ファイバ素線１１の上
部を固定する。前記先端１２の裸光ファイバ１１ａは固
定治具１３の中央に設けられた孔に固定する。ついで、
この固定治具１３とともに裸光ファイバ１１ａを下方に
引っ張って、被覆層１１ｂから裸光ファイバ１１ａが引
き抜かれる際の力（荷重）を測定する。図３はこの引き
抜き力の測定時に得られた固定治具１３の移動距離と荷
重との関係を示したグラフの一例である。このグラフの
安定した水平部分の荷重の値を引き抜き力とする。2. Description of the Related Art An optical fiber is formed by coating a bare optical fiber, usually made of quartz glass, with a synthetic resin solution (hereinafter abbreviated as a resin solution) and curing the same. A coating layer made of a synthetic resin is provided thereon. In an optical fiber, the adhesion between the bare optical fiber and the coating layer greatly affects environmental characteristics such as temperature characteristics and handleability. As an index of the adhesion, a pull-out force is used. FIG. 2 shows an example of a method for measuring the pull-out force. That is, first, a part of the coating layer 11b on one end 12 of the optical fiber 11 composed of the bare optical fiber 11a and the coating layer 11b is removed.
The top end of the optical fiber 11 is fixed by disposing the tip 12 below. The bare optical fiber 11a at the tip 12 is fixed in a hole provided at the center of the fixing jig 13. Then
The bare optical fiber 11a is pulled downward together with the fixing jig 13, and the force (load) when the bare optical fiber 11a is pulled out from the coating layer 11b is measured. FIG. 3 is an example of a graph showing the relationship between the moving distance of the fixing jig 13 and the load obtained at the time of measuring the pulling force. The value of the load on the stable horizontal portion of this graph is defined as the pull-out force.
【０００３】従来、裸光ファイバと被覆層との密着性を
向上させるために、被覆層を構成する合成樹脂にシラン
カップリング剤を配合している。この方法によれば被覆
層中のシランカップリング剤のＯＨ基と裸光ファイバを
構成する石英ガラス中の酸素（Ｏ）との間で水素結合が
生じ、これらの密着性が向上するとされている。この
際、被覆層を構成する合成樹脂中の水分は水素結合に寄
与し、裸光ファイバと被覆層との密着性をさらに向上さ
せる役割を果たす。樹脂液は吸湿性なので、被覆層形成
前の樹脂液は大気中の水分を吸収し、適度に水分を含ん
でいる場合が多い。Conventionally, in order to improve the adhesion between the bare optical fiber and the coating layer, a silane coupling agent has been blended into the synthetic resin constituting the coating layer. According to this method, a hydrogen bond is generated between the OH group of the silane coupling agent in the coating layer and oxygen (O) in the quartz glass constituting the bare optical fiber, and the adhesion therebetween is improved. . At this time, moisture in the synthetic resin constituting the coating layer contributes to hydrogen bonding, and plays a role of further improving the adhesion between the bare optical fiber and the coating layer. Since the resin liquid is hygroscopic, the resin liquid before the formation of the coating layer often absorbs moisture in the atmosphere and contains water in an appropriate amount.
【０００４】一方、裸光ファイバと被覆層との間に気泡
が混入すると、これらの密着性が低下する。このため、
コーティング前の裸光ファイバの近傍に炭酸ガス、フレ
オンガスなどのガスを流す方法がとられている。[0004] On the other hand, if air bubbles are mixed between the bare optical fiber and the coating layer, the adhesion between them decreases. For this reason,
A method of flowing a gas such as carbon dioxide gas or freon gas near the bare optical fiber before coating has been adopted.
【０００５】[0005]
【発明が解決しようとする課題】ところで、樹脂液の保
存状態によっては樹脂液の水分含量が低い場合がある。
水分含量が低い樹脂液を用いると、裸光ファイバと被覆
層との密着性が低下することがある。一方コーティング
前の裸光ファイバの近傍に流すガスは、通常水分含量が
ほとんどゼロである。このため、例え樹脂液が十分な水
分を含んでいたとしても、裸光ファイバと樹脂液との界
面に、前記ガスの流れによって水分が十分に供給されな
い場合がある。この結果密着性が低下したり、製造ロッ
トによって密着性にばらつきを生じる場合がある。本発
明は前記事情に鑑みてなされたもので、裸光ファイバと
被覆層との密着性を向上させることができる光ファイバ
素線の製造方法を提供する。また、製造ロットによって
密着性にばらつきを生じにくい光ファイバ素線の製造方
法を提供する。また、裸光ファイバと被覆層との間に気
泡が混入しない光ファイバ素線の製造方法を提供する。The water content of the resin solution may be low depending on the storage condition of the resin solution.
When a resin solution having a low water content is used, the adhesion between the bare optical fiber and the coating layer may be reduced. On the other hand, the gas flowing near the bare optical fiber before coating usually has almost zero moisture content. For this reason, even if the resin liquid contains sufficient water, the flow of the gas may not supply sufficient water to the interface between the bare optical fiber and the resin liquid. As a result, the adhesion may be reduced or the adhesion may vary depending on the production lot. The present invention has been made in view of the above circumstances, and provides a method for manufacturing an optical fiber that can improve the adhesion between a bare optical fiber and a coating layer. In addition, the present invention provides a method for manufacturing an optical fiber that is less likely to vary in adhesion depending on a manufacturing lot. Further, the present invention provides a method for manufacturing an optical fiber in which bubbles are not mixed between the bare optical fiber and the coating layer.
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するため
に、本発明においては、線引きした裸光ファイバを、シ
ランカップリング剤を添加した合成樹脂液を充填したコ
ーティング装置に導入し、前記裸光ファイバの外周上に
被覆層を形成する光ファイバ素線の製造方法であって、
前記コーティング装置導入前の裸光ファイバの表面に水
分含有ガスを供給することを特徴とする光ファイバ素線
の製造方法を提案する。前記水分含有ガスは、水分を
０．００８ｋｇ／ｍｍ3以上含むと好ましい。In order to solve the above-mentioned problems, in the present invention, a drawn optical fiber is introduced into a coating apparatus filled with a synthetic resin liquid to which a silane coupling agent is added, and the bare optical fiber is introduced into the coating apparatus. A method for manufacturing an optical fiber, which forms a coating layer on the outer periphery of the optical fiber,
A method for producing an optical fiber, characterized by supplying a moisture-containing gas to the surface of the bare optical fiber before introducing the coating apparatus, is proposed. It is preferable that the water-containing gas contains 0.008 kg / mm 3 or more of water.
【０００７】[0007]
【発明の実施の形態】図１は本発明の光ファイバ素線の
製造方法の一例を示したものである。最初に加熱炉でフ
ァイバ母材を加熱し、線引きした裸光ファイバ１１ａ
を、上方から水分含有ガス供給装置１に供給する。前記
裸光ファイバ１１ａは、石英系ガラスからなる外径約１
２５μｍの一般的なものである。前記水分含有ガス供給
装置１にはガス供給管１ｂから連続的に水分含有ガス１
ａが供給されている。水分含有ガス１ａは水分を０．０
０８ｋｇ／ｍｍ3以上、さらに好ましくは０．００９〜
０．０１６ｋｇ／ｍｍ3含む空気である。水分含有量が
０．００８ｋｇ／ｍｍ3未満であると水分供給量が不十
分となり、０．０１６ｋｇ／ｍｍ3をこえると逆に水分
供給量が多すぎ、結露してしまうこともあるため不都合
である。水分含有ガス１ａの主成分であるガスは空気に
限定するものではないが、通常は空気が安価で好まし
い。FIG. 1 shows an example of a method for manufacturing an optical fiber according to the present invention. First, the fiber preform is heated in a heating furnace, and the drawn bare optical fiber 11a is drawn.
Is supplied to the water-containing gas supply device 1 from above. The bare optical fiber 11a has an outer diameter of about 1 made of quartz glass.
It is a general thing of 25 μm. The moisture-containing gas supply device 1 is connected to the moisture-containing gas 1 continuously from a gas supply pipe 1b.
a is supplied. The water-containing gas 1a has a water content of 0.0
08 kg / mm 3 or more, more preferably 0.009 to
It is air containing 0.016 kg / mm 3 . If the water content is less than 0.008 kg / mm 3 , the water supply becomes insufficient. If the water content exceeds 0.016 kg / mm 3 , the water supply is too large and condensate may be formed. is there. The gas that is the main component of the water-containing gas 1a is not limited to air, but air is usually inexpensive and preferable.
【０００８】ガス供給管１ｂに接続されている水分含有
ガスの供給源は、ガス供給源と水分供給源との組み合わ
せからなり、水分含量一定の水分含有ガスを流量一定で
供給するものである。前記ガス供給源としては例えばコ
ンプレッサーなどが用いられ、前記水分供給源としては
バブリングなどが用いられる。前記水分含有ガスの供給
源には流量計、水分測定器などが取り付けられている。
通常水分含有ガス１ａの供給速度は１〜５Ｌ／ｍｉｎと
される。The supply source of the moisture-containing gas connected to the gas supply pipe 1b is a combination of a gas supply source and a moisture supply source, and supplies a moisture-containing gas having a constant moisture content at a constant flow rate. For example, a compressor or the like is used as the gas supply source, and bubbling or the like is used as the moisture supply source. A flow meter, a moisture meter, and the like are attached to the supply source of the moisture-containing gas.
Usually, the supply rate of the moisture-containing gas 1a is set to 1 to 5 L / min.
【０００９】この水分含有ガス供給装置１を通過した裸
光ファイバ１１ａは、出口１ｃからコーティング装置２
に連続的に導かれる。このコーティング装置２には、樹
脂供給管２ｂから供給された樹脂液２ａが充填されてお
り、このコーティング装置２の出口２ｃから、裸光ファ
イバ１１ａの外周上に未硬化の被覆層１１ｂが設けられ
たものが引き出される。そして、この被覆層１１ｂを、
所定の硬化装置を通過させた後、光ファイバ素線１１が
得られる。この裸光ファイバ１１ａの線引きから光ファ
イバ素線１１の供給までの工程は通常連続的に行われ、
この際の線引き速度は例えば１０〜１５ｍ／ｓｅｃとさ
れる。The bare optical fiber 11a that has passed through the moisture-containing gas supply device 1 passes through the outlet 1c through the coating device 2a.
Continuously. The coating device 2 is filled with a resin liquid 2a supplied from a resin supply pipe 2b, and an uncured coating layer 11b is provided on the outer periphery of the bare optical fiber 11a from an outlet 2c of the coating device 2. Is pulled out. Then, this coating layer 11b is
After passing through a predetermined curing device, the optical fiber 11 is obtained. The process from the drawing of the bare optical fiber 11a to the supply of the optical fiber 11 is usually performed continuously,
The drawing speed at this time is, for example, 10 to 15 m / sec.
【００１０】前記被覆層１１ｂを形成する材料としては
例えば紫外線硬化型樹脂などが用いられ、この場合前記
硬化装置としては紫外光照射装置が用いられる。また、
樹脂液２ａにはシランカップリング剤が０．３〜２重量
％程度添加されていると好ましい。As a material for forming the coating layer 11b, for example, an ultraviolet curing resin is used. In this case, an ultraviolet light irradiation device is used as the curing device. Also,
It is preferable that a silane coupling agent is added to the resin liquid 2a in an amount of about 0.3 to 2% by weight.
【００１１】この光ファイバ素線の製造方法において
は、コーティング装置２に供給する直前に、裸光ファイ
バ１１ａの表面に水分含有ガスが供給される。このた
め、裸光ファイバ１１ａは、その外周上に水分が十分に
供給された状態で、樹脂液によってコーティングされる
ので、裸光ファイバ１１ａと被覆層１１ｂとの界面の水
分が不足することがない。この結果、樹脂液２ａに添加
されたシランカップリング剤の効果を向上させることが
できる。また、水分含有ガスの流れによって、裸光ファ
イバ１１ａと被覆層１１ｂとの間に気泡が混入すること
を防止することができる。以上のふたつの作用により、
裸光ファイバ１１ａと被覆層１１ｂとの密着性が向上
し、かつ製造ロットによる密着性のばらつきが発生しに
くくなる。In this method for producing an optical fiber, a moisture-containing gas is supplied to the surface of the bare optical fiber 11a immediately before supplying to the coating apparatus 2. For this reason, the bare optical fiber 11a is coated with the resin liquid in a state where the outer periphery thereof is sufficiently supplied with moisture, so that there is no shortage of moisture at the interface between the bare optical fiber 11a and the coating layer 11b. . As a result, the effect of the silane coupling agent added to the resin liquid 2a can be improved. In addition, it is possible to prevent bubbles from being mixed between the bare optical fiber 11a and the coating layer 11b due to the flow of the moisture-containing gas. By these two actions,
The adhesion between the bare optical fiber 11a and the coating layer 11b is improved, and variations in adhesion between production lots are less likely to occur.
【００１２】[0012]
【実施例】以下、本発明を実施例を示して詳しく説明す
る。シランカップリング剤を１重量％含む紫外線硬化型
樹脂液を、乾燥空気と加湿によって、重量比で４００ｐ
ｐｍ，２００ｐｐｍ，２０ｐｐｍの水分量にそれぞれ調
整した。また、水分含有ガスは乾燥空気の水分量を調整
し、それぞれ水分量が０．００１ｋｇ／ｍｍ3，０．０
０４ｋｇ／ｍｍ3，０．００８ｋｇ／ｍｍ3のものを用意
した。これらの樹脂液と水分含有ガスとの組み合わせに
より、図１に示した方法で光ファイバ素線を製造した。
そして、各条件毎に２０サンプルずつ、図２に示した方
法で、図３に示したグラフの水平部分の荷重を引き抜き
力として測定した。表１には、それぞれの条件毎に、２
０サンプルの測定値を被覆層部分の長さで除して規格化
した値（ｇ／ｃｍ）の平均値と、標準偏差を示した。こ
の結果より、水分含有ガスの水分量が０．００８ｋｇ／
ｍｍ3の場合は引き抜き力が大きく、裸光ファイバと被
覆層との密着性が良好で、また樹脂液の水分量に関わら
ず、引き抜き力のばらつきが少なく、特性が安定してい
ることが明らかとなった。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. An ultraviolet-curable resin solution containing 1% by weight of a silane coupling agent is dried at a weight ratio of 400 p by dry air and humidification.
The water content was adjusted to pm, 200 ppm, and 20 ppm, respectively. The moisture-containing gas adjusts the moisture content of the dry air so that the moisture content is 0.001 kg / mm 3 and 0.03 kg / mm 3 , respectively.
04 kg / mm 3 and 0.008 kg / mm 3 were prepared. An optical fiber was manufactured by the method shown in FIG. 1 using a combination of the resin liquid and the water-containing gas.
Then, the load on the horizontal portion of the graph shown in FIG. 3 was measured as a pull-out force by the method shown in FIG. 2 for 20 samples for each condition. Table 1 shows that for each condition, 2
The average value (g / cm) normalized by dividing the measured value of the 0 sample by the length of the coating layer portion and the standard deviation were shown. From this result, the water content of the water-containing gas was 0.008 kg /
In the case of mm 3 , it is clear that the pull-out force is large, the adhesion between the bare optical fiber and the coating layer is good, and the dispersion of the pull-out force is small and the characteristics are stable regardless of the water content of the resin liquid. It became.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】以上説明したように本発明においては、
コーティング装置に供給する直前に、裸光ファイバの表
面に水分含有ガスが供給される。このため、裸光ファイ
バは、その外周上に水分が十分に供給された状態で樹脂
液によってコーティングされるので、裸光ファイバと被
覆層との界面の水分が不足することがない。この結果、
樹脂液に添加されたシランカップリング剤の効果を向上
させることができる。また、水分含有ガスの流れによっ
て、裸光ファイバと被覆層との間に気泡が混入すること
を防止することができる。以上のふたつの作用により、
裸光ファイバと被覆層との密着性が向上し、かつ製造ロ
ットによって密着性のばらつきが発生しにくくなる。As described above, in the present invention,
Immediately before supplying to the coating device, a moisture-containing gas is supplied to the surface of the bare optical fiber. For this reason, the bare optical fiber is coated with the resin liquid in a state where the outer periphery thereof is sufficiently supplied with moisture, so that there is no shortage of moisture at the interface between the bare optical fiber and the coating layer. As a result,
The effect of the silane coupling agent added to the resin solution can be improved. In addition, it is possible to prevent bubbles from being mixed between the bare optical fiber and the coating layer due to the flow of the moisture-containing gas. By these two actions,
The adhesion between the bare optical fiber and the coating layer is improved, and the adhesion is less likely to vary depending on the production lot.
【図１】 本発明の光ファイバ素線の製造方法の一例を
示した概略構成図である。FIG. 1 is a schematic configuration diagram showing an example of a method for manufacturing an optical fiber of the present invention.
【図２】 裸光ファイバと被覆層との密着性の指標であ
る引き抜き力の測定方法の一例を示した説明図である。FIG. 2 is an explanatory diagram showing an example of a method of measuring a pulling force, which is an index of the adhesion between a bare optical fiber and a coating layer.
【図３】 引き抜き力の測定時に得られるグラフの一例
を示した図である。FIG. 3 is a diagram showing an example of a graph obtained at the time of measuring a pulling force.
１…水分含有ガス供給装置、１ａ…水分含有ガス、１ｂ
…ガス供給管、２…コーティング装置、２ａ…樹脂液、
２ｂ…樹脂供給管、１１…光ファイバ素線、１１ａ…裸
光ファイバ、１１ｂ…被覆層。DESCRIPTION OF SYMBOLS 1 ... Moisture containing gas supply apparatus, 1a ... Moisture containing gas, 1b
... gas supply pipe, 2 ... coating device, 2a ... resin liquid,
2b: resin supply tube, 11: optical fiber, 11a: bare optical fiber, 11b: coating layer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 浩一 千葉県佐倉市六崎1440番地 株式会社フジ クラ佐倉工場内 Ｆターム(参考） 2H050 BA01 BA03 BA11 BA32 BB33Q 4G059 AA11 AB01 FA09 FA30 FB04 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Takahashi 1440 Mutsuzaki, Sakura City, Chiba Prefecture Fujikura Co., Ltd. Sakura Plant F-term (reference) 2H050 BA01 BA03 BA11 BA32 BB33Q 4G059 AA11 AB01 FA09 FA30 FB04
Claims (2)
プリング剤を添加した合成樹脂液を充填したコーティン
グ装置に導入し、前記裸光ファイバの外周上に被覆層を
形成する光ファイバ素線の製造方法であって、 前記コーティング装置導入前の裸光ファイバの表面に水
分含有ガスを供給することを特徴とする光ファイバ素線
の製造方法。1. A method for producing an optical fiber in which a drawn bare optical fiber is introduced into a coating apparatus filled with a synthetic resin solution to which a silane coupling agent has been added, and a coating layer is formed on the outer periphery of the bare optical fiber. A method for producing an optical fiber, comprising supplying a water-containing gas to the surface of the bare optical fiber before introducing the coating device.
ｋｇ／ｍｍ3以上含むことを特徴とする請求項１記載の
光ファイバ素線の製造方法。2. The method according to claim 1, wherein the water-containing gas has a water content of 0.008.
2. The method for producing an optical fiber according to claim 1, wherein the amount is not less than kg / mm 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20409998A JP4094128B2 (en) | 1998-07-17 | 1998-07-17 | Manufacturing method and manufacturing apparatus for optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20409998A JP4094128B2 (en) | 1998-07-17 | 1998-07-17 | Manufacturing method and manufacturing apparatus for optical fiber |
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| Publication Number | Publication Date |
|---|---|
| JP2000034137A true JP2000034137A (en) | 2000-02-02 |
| JP2000034137A5 JP2000034137A5 (en) | 2005-05-19 |
| JP4094128B2 JP4094128B2 (en) | 2008-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP20409998A Expired - Fee Related JP4094128B2 (en) | 1998-07-17 | 1998-07-17 | Manufacturing method and manufacturing apparatus for optical fiber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013018668A (en) * | 2011-07-08 | 2013-01-31 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber |
| JP2013018669A (en) * | 2011-07-08 | 2013-01-31 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber |
| JP2013019984A (en) * | 2011-07-08 | 2013-01-31 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber |
| WO2014119250A1 (en) | 2013-02-04 | 2014-08-07 | 古河電気工業株式会社 | Optical fiber and method for producing same |
| US12030808B2 (en) | 2020-01-29 | 2024-07-09 | Fujikura Ltd. | Method for manufacturing an optical fiber |
| JP7514178B2 (en) | 2020-01-29 | 2024-07-10 | 株式会社フジクラ | Optical fiber manufacturing method |
-
1998
- 1998-07-17 JP JP20409998A patent/JP4094128B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013018668A (en) * | 2011-07-08 | 2013-01-31 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber |
| JP2013018669A (en) * | 2011-07-08 | 2013-01-31 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber |
| JP2013019984A (en) * | 2011-07-08 | 2013-01-31 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber |
| WO2014119250A1 (en) | 2013-02-04 | 2014-08-07 | 古河電気工業株式会社 | Optical fiber and method for producing same |
| US10793470B2 (en) | 2013-02-04 | 2020-10-06 | Furukawa Electric Co., Ltd. | Optical fiber and method of manufacturing the same |
| US12030808B2 (en) | 2020-01-29 | 2024-07-09 | Fujikura Ltd. | Method for manufacturing an optical fiber |
| JP7514178B2 (en) | 2020-01-29 | 2024-07-10 | 株式会社フジクラ | Optical fiber manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4094128B2 (en) | 2008-06-04 |
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