JPS623034A - Production of optical fiber - Google Patents
Production of optical fiberInfo
- Publication number
- JPS623034A JPS623034A JP60138754A JP13875485A JPS623034A JP S623034 A JPS623034 A JP S623034A JP 60138754 A JP60138754 A JP 60138754A JP 13875485 A JP13875485 A JP 13875485A JP S623034 A JPS623034 A JP S623034A
- Authority
- JP
- Japan
- Prior art keywords
- quartz tube
- optical fiber
- gas
- sealed
- tube
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/08—Sub-atmospheric pressure applied, e.g. vacuum
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/12—Drawing solid optical fibre directly from a hollow preform
- C03B2205/16—Drawing solid optical fibre directly from a hollow preform the drawn fibre consisting of circularly symmetric core and clad
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は、内付けＣＶＤ法による光ファイバの製造方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of manufacturing an optical fiber using an internal CVD method.
従来より、石英管の内部に該石英管より屈折率の高い合
成ガラスを内付けせしめ通称コアと呼ばれる部分を形成
し、これを線引炉により線引と同時にコラプスして光フ
ァイバを得る方法が知られている。Conventionally, there has been a method in which a synthetic glass with a higher refractive index than the quartz tube is placed inside the quartz tube to form a part commonly called a core, and this is collapsed at the same time as drawing in a drawing furnace to obtain an optical fiber. Are known.
しかしながらこの方法には次のような問題がある。すな
わち、前述の如く管内部にコア部を形成してなる石英管
はその中央部が中空であるため、線引時に大気中の水分
が混入し、該水分が線引時に光フアイバ内に取り込まれ
、光ファイバの伝送損失が劣化するという問題がある。However, this method has the following problems. In other words, as mentioned above, since the quartz tube with the core formed inside the tube is hollow in the center, moisture from the atmosphere mixes in during drawing, and this moisture is taken into the optical fiber during drawing. , there is a problem that the transmission loss of the optical fiber deteriorates.
そのため今日では、石英管内に合成ガラス層を形成後、
線引に先立ってこの石英管をコラプスしてしまい、棒状
のプリフォームを得、これを線引炉により線引して光フ
ァイバを得ている。しかしながらこの方法は前記線引と
コラプスを同時に行う方法に比較して製造工程数が多い
ためコスト高になるという問題がある。Therefore, today, after forming a synthetic glass layer inside the quartz tube,
Prior to drawing, this quartz tube is collapsed to obtain a rod-shaped preform, which is then drawn in a drawing furnace to obtain an optical fiber. However, this method has a problem in that it requires more manufacturing steps than the method in which drawing and collapse are performed simultaneously, resulting in higher costs.
前記問題に鑑み本発明の目的は、石英管内への水分の混
入を防止でき、しかも線引とコラプスを同時に行うこと
のできる効率的な光ファイバの製造方法を提供すること
にある。In view of the above problems, an object of the present invention is to provide an efficient optical fiber manufacturing method that can prevent moisture from entering the quartz tube and can perform drawing and collapse at the same time.
前記目的を達成すべく本発明は、石英管の内側に該石英
管よりも屈折率の高い合成ガラスを内付けせしめ、これ
を線引炉により線引しながらコラプスして光ファイバを
得る光ファイバの製造方法において、前記石英管内に前
記合成ガラスを内付は後膣石英管の一端を封止して封止
端を形成し、続いて前記石英管を加熱しながら該石英管
の他端から石英管内部のガスを吸気し管内部の除湿を行
い、続いて前記石英管内部にハロゲンガスまたは水素を
含まないハロゲン化物ガスを満たし前記封止端から光フ
ァイバを線引することを特徴とするものである。In order to achieve the above object, the present invention provides an optical fiber in which a synthetic glass having a refractive index higher than that of the quartz tube is attached inside the quartz tube, and the synthetic glass is collapsed while being drawn in a drawing furnace to obtain an optical fiber. In the manufacturing method, the synthetic glass is inserted into the quartz tube by sealing one end of the quartz tube to form a sealed end, and then heating the quartz tube from the other end of the quartz tube. The method is characterized in that the gas inside the quartz tube is sucked in to dehumidify the inside of the tube, and then the inside of the quartz tube is filled with a halogen gas or a halide gas not containing hydrogen, and an optical fiber is drawn from the sealed end. It is something.
本発明の実施例を図を参照して詳細に説明する。 Embodiments of the present invention will be described in detail with reference to the drawings.
第１図が示すように本発明にあっては、まず、石英管１
の内部に該石英管ｌよりも屈折率の高い合成ガラス膚２
を内付けせしめかつその一端を封止して封止端３を形成
する。続いてこの石英管ｌを排気ポンプ４、バルブ５．
６．７及び該バルブ７と、前記排気ポンプ４との間に設
けた；・ラップ８と、これらを図の如く接続してなる配
管とからなる気密性の配管系９に接続する。ここでバル
ブ５はυ「気口１８へのバイパスライン用のバルブで、
あったほうが好ましいが、絶対必要要件ではない。As shown in FIG. 1, in the present invention, first, a quartz tube 1
A synthetic glass skin 2 having a higher refractive index than the quartz tube 1 is placed inside the quartz tube 1.
is attached inside and one end thereof is sealed to form a sealed end 3. Next, this quartz tube l is connected to an exhaust pump 4, a valve 5.
6.7, provided between the valve 7 and the exhaust pump 4; Connected to an airtight piping system 9 consisting of a wrap 8 and piping connecting these as shown in the figure. Here, valve 5 is a valve for the bypass line to air port 18,
It is preferable to have one, but it is not an absolute requirement.
また符号１７はこの配管系９にガスを送気する送気口で
ある。さらに符号１２はフレキシブルバイブで前記石英
管１と前記配管系９とを接続するのに使用される。この
ように石英管１を配管系９にフレキシブルバイブ１２を
介して接続部２１にて接続したら、この石英管ｌを加熱
炉ｌＯ内に保持し、前記バルブ５．６を閉じ、バルブ７
を開けた状態にして前記排気ポンプ４にて吸気する。こ
こでトラ・ノブ８は腐食性のガスにより排気ポンプ４を
傷めないためと、排気ポンプ４側からのガスの逆流を防
止する目的を有する。それ数本発明において不可欠の構
成要件ではないが、あったほうが好ましい。Further, reference numeral 17 is an air supply port for supplying gas to this piping system 9. Furthermore, reference numeral 12 denotes a flexible vibe used to connect the quartz tube 1 and the piping system 9. After connecting the quartz tube 1 to the piping system 9 via the flexible vibrator 12 at the connection part 21 in this way, the quartz tube 1 is held in the heating furnace IO, the valve 5.6 is closed, and the valve 7
The exhaust pump 4 is opened to take in air. Here, the purpose of the tiger knob 8 is to prevent the exhaust pump 4 from being damaged by corrosive gas and to prevent backflow of gas from the exhaust pump 4 side. Although this number is not an essential component of the present invention, it is preferable to have it.
このようにして前記加熱炉１０で石英管１を外部より加
熱し、かつ排気ポンプ４で石英管１の中空部１１内のガ
スを吸気することにより、石英管１の吸着水を内部から
除去せしめる。ここで、前記加熱炉１０の加熱温度とし
ては約１００〜５００℃の範囲が好ましい。なぜなら、
これより高すぎると水分が石英と反応して逆に取り込ま
れてしまうからである。前述の如くして、吸着水の除去
が完了したらバルブ７を閉じ、バルブ６を開け、例えば
塩素ガス等のハロゲンガスまたはフレオンガスや塩化チ
オニル等の水素を含まないハロゲン化物ガスを送気口１
７から送気し、吸気され減圧状態の石英管１の中空部１
１を満たし、これらガスの脱水作用により残留している
水分をより完全に除去せしめる。In this way, the quartz tube 1 is heated from the outside in the heating furnace 10, and the gas in the hollow part 11 of the quartz tube 1 is sucked in by the exhaust pump 4, thereby removing the adsorbed water in the quartz tube 1 from the inside. . Here, the heating temperature of the heating furnace 10 is preferably in the range of about 100 to 500°C. because,
This is because if the temperature is too high, water will react with the quartz and will be taken in. When the removal of adsorbed water is completed as described above, the valve 7 is closed, the valve 6 is opened, and a halogen gas such as chlorine gas or a hydrogen-free halide gas such as Freon gas or thionyl chloride is supplied to the air supply port 1.
Air is supplied from 7, and the hollow part 1 of the quartz tube 1 is in a depressurized state after being sucked in.
1, and the remaining moisture is removed more completely by the dehydration action of these gases.
ここで前記石英管１の中空部１１のガスの吸気と該中空
部１１へのハロゲンガス等の送気は必要に応じて数回繰
り返してもよい。次にハロゲンガスまたはハロゲン化物
ガスを送気し、中空部１１に送気したガス満たしたらこ
のまま、すなわち石英管１を配管系９にフレキシブルバ
イブ１２を介して接続したままこの石英管１を線引炉１
５に移動し配置せしめる。ここで符号１３は石英管１を
支持するための支持部材である。尚前述の如く配管系９
とこの石英管１とをフレキシブルバイブ１１で接続して
おくと、この移動が容易である。前述のように石英管１
を線引炉１５に配置せしめたら、該石英管１の封止端゛
３よりキャプスタン１６や図示されていない引取機、巻
取機等により線引し、かつ同時にコラプスしながら光フ
ァイバ２０を製造する。尚線引時に石英管１の中空部１
１内に満たされているガスを逃がすため前記バルブ５は
開けておく。この時バルブ６も開けておき、送気口１７
からハロゲンガス等を送気し続ける。すなわち、送気口
１７からのハロゲンガス等の送気と排気口１８からのこ
れらガスの排気を同時に行いながら線引を行う。このよ
うにすると石英管ｌの中空部１１がハロゲンガス等の脱
水性ガスにより常に外気からシールされているので脱水
遮水効果がより向上する。Here, the intake of gas into the hollow part 11 of the quartz tube 1 and the supply of halogen gas or the like to the hollow part 11 may be repeated several times as necessary. Next, halogen gas or halide gas is supplied, and once the hollow part 11 is filled with the supplied gas, the quartz tube 1 is drawn as it is, that is, while the quartz tube 1 is connected to the piping system 9 via the flexible vibe 12. Furnace 1
5 and place it. Here, reference numeral 13 is a support member for supporting the quartz tube 1. Furthermore, as mentioned above, the piping system 9
This movement is facilitated by connecting the quartz tube 1 and the quartz tube 1 with a flexible vibrator 11. As mentioned above, quartz tube 1
Once placed in the drawing furnace 15, the optical fiber 20 is drawn from the sealed end 3 of the quartz tube 1 using a capstan 16, a take-up machine, a winder, etc. (not shown), and is collapsed at the same time. Manufacture. In addition, when drawing the hollow part 1 of the quartz tube 1
The valve 5 is left open in order to release the gas filled in the chamber 1. At this time, also open the valve 6 and open the air inlet 17.
Continue to supply halogen gas, etc. That is, drawing is performed while simultaneously supplying air such as halogen gas from the air supply port 17 and exhausting these gases from the exhaust port 18. In this way, the hollow part 11 of the quartz tube l is always sealed from the outside air by the dehydrating gas such as halogen gas, thereby further improving the dehydrating and water-blocking effect.
以上如く本発明によれば、石英管１内への水分の混入を
より確実に防止できるので長期安定性に優れた光ファイ
バの製造が可能であると共に、線引とコラプスを同時に
行うことのできるのでより効率よく光ファイバの製造が
できる。As described above, according to the present invention, since it is possible to more reliably prevent moisture from entering the quartz tube 1, it is possible to manufacture an optical fiber with excellent long-term stability, and it is also possible to perform drawing and collapse at the same time. Therefore, optical fibers can be manufactured more efficiently.
前述の如く本発明によれば、水分含有量がきわめて少な
く、それゆえ長期信頼性に優れた光ファイバをより効率
よく製造することができる。As described above, according to the present invention, it is possible to more efficiently manufacture an optical fiber that has an extremely low water content and therefore has excellent long-term reliability.
第１図は本発明の光ファイバの製造方法の一実施例を示
す概略図である。FIG. 1 is a schematic diagram showing an embodiment of the optical fiber manufacturing method of the present invention.
Claims (1)
を内付けせしめ、これを線引炉により線引しながらコラ
プスして光ファイバを得る光ファイバの製造方法におい
て、前記石英管内に前記合成ガラスを内付け後該石英管
の一端を封止して封止端を形成し、続いて前記石英管を
加熱しながら該石英管の他端から石英管内部のガスを吸
気し管内部の除湿を行い、続いて前記石英管内部にハロ
ゲンガスまたは水素を含まないハロゲン化物ガスを満た
し前記封止端から光ファイバを線引することを特徴とす
る光ファイバの製造方法。In the method for manufacturing an optical fiber, an optical fiber is obtained by disposing synthetic glass having a higher refractive index than the quartz tube inside the quartz tube, and collapsing the glass while drawing it in a drawing furnace. After the synthetic glass is installed inside, one end of the quartz tube is sealed to form a sealed end, and then, while heating the quartz tube, the gas inside the quartz tube is sucked in from the other end of the quartz tube. A method for manufacturing an optical fiber, comprising dehumidifying the quartz tube, filling the inside of the quartz tube with a halogen gas or a hydrogen-free halide gas, and drawing the optical fiber from the sealed end.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60138754A JPS623034A (en) | 1985-06-25 | 1985-06-25 | Production of optical fiber |
| CN 85106259 CN1014513B (en) | 1985-06-25 | 1985-08-10 | Method of manufacturing optical fiber substrate material |
| CN86104197A CN1011227B (en) | 1985-06-25 | 1986-06-17 | Mfg. method for optics fibre |
| US06/877,854 US4772303A (en) | 1985-06-25 | 1986-06-24 | Process for fabricating optical fiber |
| CA000512329A CA1271919A (en) | 1985-06-25 | 1986-06-24 | Process for fabricating optical fiber |
| GB8615513A GB2178737B (en) | 1985-06-25 | 1986-06-25 | Process for fabricating optical fibre |
| KR1019860005098A KR900007333B1 (en) | 1985-06-25 | 1986-06-25 | Mfg.method for optics fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60138754A JPS623034A (en) | 1985-06-25 | 1985-06-25 | Production of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS623034A true JPS623034A (en) | 1987-01-09 |
Family
ID=15229400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60138754A Pending JPS623034A (en) | 1985-06-25 | 1985-06-25 | Production of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS623034A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002543025A (en) * | 1999-04-26 | 2002-12-17 | コーニング インコーポレイテッド | Optical fiber and method for manufacturing low polarization mode dispersion and low attenuation loss optical fiber |
| US7486862B2 (en) | 2003-05-19 | 2009-02-03 | Sumitomo Electric Industries, Ltd. | Optical fiber and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5180241A (en) * | 1975-01-08 | 1976-07-13 | Sumitomo Electric Industries | HIKARIDENSOYOFUAIBAANO SEIZOHOHO |
| JPS5756336A (en) * | 1980-08-07 | 1982-04-03 | Western Electric Co | Manufacture of light transmitting preform |
-
1985
- 1985-06-25 JP JP60138754A patent/JPS623034A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5180241A (en) * | 1975-01-08 | 1976-07-13 | Sumitomo Electric Industries | HIKARIDENSOYOFUAIBAANO SEIZOHOHO |
| JPS5756336A (en) * | 1980-08-07 | 1982-04-03 | Western Electric Co | Manufacture of light transmitting preform |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002543025A (en) * | 1999-04-26 | 2002-12-17 | コーニング インコーポレイテッド | Optical fiber and method for manufacturing low polarization mode dispersion and low attenuation loss optical fiber |
| US7486862B2 (en) | 2003-05-19 | 2009-02-03 | Sumitomo Electric Industries, Ltd. | Optical fiber and manufacturing method thereof |
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