JPH02293342A - Drawing of optical fiber of fluoride and device therefor - Google Patents
Drawing of optical fiber of fluoride and device thereforInfo
- Publication number
- JPH02293342A JPH02293342A JP1114786A JP11478689A JPH02293342A JP H02293342 A JPH02293342 A JP H02293342A JP 1114786 A JP1114786 A JP 1114786A JP 11478689 A JP11478689 A JP 11478689A JP H02293342 A JPH02293342 A JP H02293342A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- fluoride
- preform
- optical fiber
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 33
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 29
- 239000011521 glass Substances 0.000 claims abstract description 20
- 239000011261 inert gas Substances 0.000 claims abstract description 12
- 239000005383 fluoride glass Substances 0.000 claims abstract description 7
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 6
- 150000002367 halogens Chemical class 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 20
- 238000005491 wire drawing Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 229910002319 LaF3 Inorganic materials 0.000 abstract description 4
- 229910001632 barium fluoride Inorganic materials 0.000 abstract description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 abstract 2
- BYMUNNMMXKDFEZ-UHFFFAOYSA-K trifluorolanthanum Chemical compound F[La](F)F BYMUNNMMXKDFEZ-UHFFFAOYSA-K 0.000 abstract 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 18
- 238000005253 cladding Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910007998 ZrF4 Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- OMQSJNWFFJOIMO-UHFFFAOYSA-J zirconium tetrafluoride Chemical group F[Zr](F)(F)F OMQSJNWFFJOIMO-UHFFFAOYSA-J 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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
- C03B37/02754—Solid fibres drawn from hollow preforms
-
- 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
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/80—Non-oxide glasses or glass-type compositions
- C03B2201/82—Fluoride glasses, e.g. ZBLAN glass
-
- 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
- C03B2205/14—Drawing solid optical fibre directly from a hollow preform comprising collapse of an outer tube onto an inner central solid preform rod
-
- 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)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、高強度にして低損失なフッ化物光ファイバを
作製するための線引き方法およびそのためＫ必要とする
線引き装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a drawing method for producing a high-strength, low-loss fluoride optical fiber, and a drawing apparatus that requires K for this purpose.
従来の技術及び発明が解決しようとする課題ＺｒＦ４を
主成分とするフッ化物ガラス光ファイバ（以下フッ化物
光ファイバという。）は石英系光ファイバを凌ぐ１０
ｄＢ／ＫＩＩ１以下の伝送損失を持つことが理論的に
期待され、将来の長距離大容量光通信媒体として現在開
発研究が進められている。Problems to be Solved by the Prior Art and the Invention Fluoride glass optical fibers (hereinafter referred to as fluoride optical fibers) whose main component is ZrF4 have advantages over silica-based optical fibers.
It is theoretically expected to have a transmission loss of dB/KII1 or less, and development research is currently underway as a future long-distance, high-capacity optical communication medium.
フッ化物光ファイバを実用に供するためには、その伝送
特性を向上させるとともに、機械的強度も向上させるこ
とが必要である。In order to put fluoride optical fiber into practical use, it is necessary to improve its transmission characteristics as well as its mechanical strength.
ところで、大容量光通信媒体とするには単一モード光フ
ァイバの実現が不可欠であるが、最近、ジャケット線引
き法によりフッ化物光ファイバにおいても単一モード光
ファイバが得られるようになった（ Ｙ． Ｏｈｉｓｈ
ｉ ｅｔ ａｌ， ＩＥＥＥ Ｊ． Ｌｉｇｈｔｗａｖ
ｅ Ｔｅｃｈｎｏｌｏｇｙ ９ ＶＯＩ ， ＬＴ−２
，ｐ． ５９３（１９８４） ）。By the way, the realization of single-mode optical fiber is essential for high-capacity optical communication media, and recently it has become possible to obtain single-mode optical fiber even with fluoride optical fiber by jacket drawing method (Y .Ohish
i et al, IEEE J. Lightwave
e Technology 9 VOI, LT-2
, p. 593 (1984)).
プリフォームとジャケット管界面に水酸基が残留してい
ると、単一モード光ファイバではコアからクラッド層へ
の電界分布の浸み出しが大きいため、該水酸基による吸
収損失を被ることになる。If hydroxyl groups remain at the interface between the preform and the jacket tube, a single mode optical fiber will suffer from absorption loss due to the hydroxyl groups since the electric field distribution from the core to the cladding layer will seep out significantly.
特に、内側クラッド層の薄いＷ型の屈折率分布を持った
単一モード光ファイバ（『光通信ハンドブック』柳井久
義編集、朝倉書店 参照）をジャケット線引き法で作製
した場合、界面の水酸基の損失への影響は著しくなる。In particular, when a single mode optical fiber with a thin W-shaped refractive index distribution in the inner cladding layer (see "Optical Communication Handbook" edited by Hisayoshi Yanai, published by Asakura Shoten) is fabricated using the jacket drawing method, loss of hydroxyl groups at the interface occurs. The impact will be significant.
また単一モード光ファイバに限らずロッドインチューブ
法で光ファイバを作製した場合、コアとクラッドになる
ジャケット管との界面に水酸基が存在すると水酸基によ
る吸収損失は著しく大きいものになる。In addition, when an optical fiber, not only a single mode optical fiber, is manufactured by the rod-in-tube method, if a hydroxyl group is present at the interface between the core and the jacket tube that becomes the cladding, the absorption loss due to the hydroxyl group will be significantly large.
従って損失特性向上のためには界面の水酸基を除くこと
が不可欠である。Therefore, in order to improve the loss characteristics, it is essential to remove the hydroxyl groups at the interface.
また、界面の水酸基は、線引き温度まで加熱されると一
部が脱水縮合反応をおこし、酸化物が形成されることも
ある。この酸化物は表面結晶化を誘起し、これが光ファ
イバの強度劣化の原因となる。そのため、ジャケット線
引きにより高強度フッ化物光ファイバを得るためにも、
ジャケット管内面およびそれに挿入するガラスロッドあ
るいはプリフォームの表面の水酸基を除去することが必
要である。Further, when the hydroxyl groups at the interface are heated to the drawing temperature, a part of them undergoes a dehydration condensation reaction, and an oxide may be formed. This oxide induces surface crystallization, which causes deterioration in the strength of the optical fiber. Therefore, in order to obtain high strength fluoride optical fiber by jacket drawing,
It is necessary to remove hydroxyl groups on the inner surface of the jacket tube and on the surface of the glass rod or preform inserted therein.
これまでフッ化物ガラス表面の水酸基を除く手法は試み
られているが、ファイバ線引き時に、ジャケット管内面
と挿入するガラスロッドあるいはプリフォーム表面の水
酸基を除去する技術は確立されていなかった。すなわち
、フッ化物ガラスの表面をＮ Ｈ ４ Ｎ Ｏ ｓ
Ｈ Ｎ Ｏ ｓ溶液でエッチングし、のちにＨＦガスで
処理することによって水酸基の除去を行っている例（
Ｓ ． Ｓａｋａｇｕｃｈｉ ｅｔ ａｌ，Ｊ．Ｍ
ａｔ．Ｓｃｉ． Ｌｅｔｔ，ｓ，ｐｐ．１４４０−１４
４２（１９８７））や、ＺｒＯＣノ，溶液でエッチング
し、のちにＮＦ３ガスで処理する例（ Ｈ． Ｗ． Ｓ
ｃｈｎｅｉｄｅｒ ｅｔ ａｌ．，Ｅｌｅｃｔｒｏｎ．
Ｌｅｔｔ．， ２２ ，ｐｐ． ９４９−９５０（１
９８６） ）があるが、ともにガラスロツド表面のバッ
チ処理であり、線引き時に水酸基を除去する方法には応
用できない。したがって、線引き時点では、再吸着によ
る水酸基が残留するという欠点があった。Although methods for removing hydroxyl groups from the surface of fluoride glass have been attempted, no technology has been established to remove hydroxyl groups from the inner surface of the jacket tube, the inserted glass rod, or the surface of the preform during fiber drawing. That is, the surface of the fluoride glass was treated with N H 4 NO s
An example where hydroxyl groups are removed by etching with HNOs solution and later treatment with HF gas (
S. Sakaguchi et al, J. M
at. Sci. Lett, s, pp. 1440-14
42 (1987)) and an example of etching with a ZrOC solution and later treating with NF3 gas (H.W.S.
Schneider et al. , Electron.
Lett. , 22, pp. 949-950(1
986)), but both involve batch processing of the glass rod surface and cannot be applied to methods for removing hydroxyl groups during wire drawing. Therefore, at the time of drawing, there was a drawback that hydroxyl groups remained due to re-adsorption.
さらに、ジャケット法に適用する試みはなされておらず
、バッチ処理したロッドとジャケットを用いたとしても
、界面の再吸着水酸基は除去することができない。Furthermore, no attempt has been made to apply the jacket method, and even with the use of batch-treated rods and jackets, the re-adsorbed hydroxyl groups at the interface cannot be removed.
本発明の目的は、フッ化物光ファイバのジャケット線引
き工程において、ガラスロッドあるいはプリ７オーム表
面およびジャケット管内面に存在する水酸基を除去しつ
つ線引きする方法を提供し、低損失で機械的強度の優れ
たフッ化物光ファイバを作製することにある。An object of the present invention is to provide a method for drawing a fluoride optical fiber while removing hydroxyl groups present on the glass rod or pre-7ohm surface and the inner surface of the jacket tube, thereby achieving low loss and excellent mechanical strength. The purpose of this invention is to fabricate a fluoride optical fiber.
課題を解決するための手段
本発明は、フッ化物からなるジャケット管内にフッ化物
ガラスロッドあるいは７フ化物ガラスプリフォームを挿
入し前記ジャケット管と前記ガラス口ツドまたはガラス
プリフォームを加熱し一体化して線引きするフッ化物光
ファイバの線引き方法において、前記ジャケット管内お
よび上部空間の空気を含ハロゲンガスの不活性ガスで置
換し、前記ジャケット管と前記ガラスロンドまたはガラ
スプリ７オームを所定温度で所定時間加熱し、前記不活
性ガスを負圧とした後加熱し、乾燥不活性ガスを吹き付
けつつ線引きし、それを実施する大径の円筒体の支持管
本体内に小径の円筒体のガス導出管を配設して天井板部
より貫通して突出し、前記支持管本体の上部にガス排出
管を設け、下部の外周面にコネクターを固定した線引き
用支持管の前記コネクターにフッ化物からなるジャケッ
ト管を固定し、上部に乾燥不活性ガスを導入するノズル
を設けた炉芯管に上部より挿入して固定し、前記炉芯管
の外部に線引炉を配設したフッ化物光ファイバの線引き
装置である。Means for Solving the Problems The present invention involves inserting a fluoride glass rod or a heptafluoride glass preform into a jacket tube made of fluoride, and heating and integrating the jacket tube and the glass cap or glass preform. In a method for drawing a fluoride optical fiber, the air in the jacket tube and the upper space is replaced with an inert gas containing halogen, and the jacket tube and the glass rond or glass pre-7 ohm are heated at a predetermined temperature for a predetermined time. After the inert gas is brought to a negative pressure, it is heated and drawn while blowing dry inert gas, and a small-diameter cylindrical gas outlet pipe is disposed within the large-diameter cylindrical support pipe body to carry out this process. A jacket tube made of fluoride is fixed to the connector of a wire drawing support tube which penetrates and protrudes from the ceiling plate part, has a gas exhaust pipe at the upper part of the support tube body, and has a connector fixed to the outer peripheral surface of the lower part. This is a drawing device for a fluoride optical fiber, which is inserted from the upper part into a furnace core tube provided with a nozzle for introducing dry inert gas into the upper part and fixed therein, and a drawing furnace is disposed outside the furnace core tube.
作用
本発明は前記方法によりガラスロンドあるいはプリフォ
ーム表面およびジャケット管内面に存在する水酸基を除
去しつつ線引きでき、低損失で機械的強度のぼれたフッ
化物光ファイバを作製でき、装置の構成も前記の線引き
用支持管を設け、含ハロゲンガスの不活性ガスで空気を
置換して線引きを簡単に行うことができる。Effect of the Invention The present invention is capable of drawing a fluoride optical fiber while removing hydroxyl groups existing on the surface of the glass iron or preform and the inner surface of the jacket tube by the method described above, and can produce a fluoride optical fiber with low loss and excellent mechanical strength. A wire drawing support tube is provided, and the air can be replaced with a halogen-containing inert gas to facilitate wire drawing.
実施例
図は本発明のフッ化物光ファイバの線引き方法を実施す
る装置の構成概略図を示す。The embodiment diagram shows a schematic diagram of the configuration of an apparatus for carrying out the method of drawing a fluoride optical fiber according to the present invention.
図において、３０は本発明の線引き用支持管、／はガス
導入管、２は排気管、３は支持管本体、≠はコネクター
ｊは炉芯管、乙は線引炉、７はジャケット管、了はプ
リフォーム、７はノズル、を示す。In the figure, 30 is the drawing support tube of the present invention, / is the gas introduction tube, 2 is the exhaust tube, 3 is the support tube body, ≠ is the connector, j is the furnace core tube, O is the drawing furnace, 7 is the jacket tube, 7 indicates a preform, and 7 indicates a nozzle.
本発明の装置の構成を説明する。The configuration of the device of the present invention will be explained.
アルミニウム製の円筒体の支持管本体３の中央に支持管
本体３の径より小さい円筒体のガス導入口となる円筒体
のガス導入管ｌを天井板部３−／を貫通して突出して固
定し、支持管本体３の上部に横方に突出する円筒体の排
気管コを、下部には外周面にコネクター弘を設ける。先
端を円錐形とし円錐形体の先端にプリフォームどの引出
し孔を設けた円筒体のジャケット管７にプリフォーム♂
を挿入し、ジャケット管７を気密性良くコネクター≠を
介して支持管本体３に接続し、二次プリフォーム（ジャ
ケット管７とプリフォームｇよりなる。）は支持管本体
３で炉芯管ｊ内に導入される。A cylindrical gas inlet pipe l, which is a cylindrical gas inlet having a diameter smaller than that of the support pipe main body 3, is fixed to the center of the aluminum cylindrical support pipe main body 3 by protruding through the ceiling plate part 3-/. A cylindrical exhaust pipe projecting laterally is provided at the upper part of the support pipe main body 3, and a connector hole is provided on the outer peripheral surface at the lower part. A preform ♂ is placed in a cylindrical jacket tube 7 with a conical tip and a preform extraction hole provided at the tip of the conical body.
and connect the jacket tube 7 to the support tube main body 3 through the connector ≠ with good airtightness, and connect the secondary preform (consisting of the jacket tube 7 and preform g) to the furnace core tube be introduced within.
支持管本体ｊの下部には線引炉６が配設される。A drawing furnace 6 is disposed at the lower part of the support tube body j.
例ｌ：
本発明で用いたガラス組成の実施例は一次ブリフォーム
ｇのコア＆！ＺｒＦ４（６２モル％）一ＢａＦ，（ ３
０モル％） − Ａ．．ｅＦ ｓ （ ４モル％）で
、クラッドをＺｒＦ４（ ６ １モル％） − ＢａＦ
２（ ２ ９モル％）−ＬａＦ３（４モル％）−ＡＡＦ
，（ ６モル％）とするため、ジャケット管７の組成を
クラッドの組成と同一とした。Example l: An example of the glass composition used in the present invention is the core of the primary preform g &! ZrF4 (62 mol%)-BaF, (3
0 mol%) -A. ．． eFs (4 mol%) and cladding with ZrF4 (61 mol%)-BaF
2(29 mol%)-LaF3(4 mol%)-AAF
, (6 mol%), the composition of the jacket tube 7 was made the same as that of the cladding.
本発明の線引き方法を説明する。The wire drawing method of the present invention will be explained.
線引き用支持管３０で支持された二次プリフォームを炉
芯管ｊ内に導入した後、ガス導入管／よりＦ，（１０％
）−Ａｒ（９０％）混合ガスを導入しつつ前記二次プリ
フォームを線引き炉乙により２７０℃で３時間加熱した
。その後ガス排気管２より支持管本体３内を負圧になる
よう調節しなから炉芯管本体３内が３５０℃になるよう
加熱し、前記二次プリフォームを線引きした。一方、ノ
ズルタよりは炉芯管！内には乾燥不活性ガスが導入され
、線引きされた光ファイバを乾燥する。After introducing the secondary preform supported by the wire drawing support tube 30 into the furnace core tube j, the gas introduction tube/F, (10%
)-Ar (90%) mixed gas was introduced, and the secondary preform was heated at 270° C. for 3 hours in a drawing furnace. Thereafter, the pressure inside the support tube main body 3 was adjusted to negative through the gas exhaust pipe 2, and the inside of the furnace core tube main body 3 was heated to 350° C., thereby drawing the secondary preform. On the other hand, the furnace core tube is better than the nozzleta! A dry inert gas is introduced into the chamber to dry the drawn optical fiber.
線引き中、一次プリフォームとジャケット管の界面には
表面の結晶化時に見られる縦縞状のパターンは見られな
かった。また、機械的強度を曲げ強度測定により求めた
ところ平均で１．５ＧＰａ（ギガパスカル）程あり、良
好な強度特性を持っていることがわかった。During drawing, the vertical striped pattern seen during surface crystallization was not observed at the interface between the primary preform and the jacket tube. Furthermore, when the mechanical strength was determined by bending strength measurement, it was found to be about 1.5 GPa (gigapascal) on average, indicating that it had good strength characteristics.
また破壊起点がファイバ表面に存在していることから、
該界面が強度劣化の原因となってはいないことがわかっ
た。In addition, since the fracture origin is on the fiber surface,
It was found that the interface did not cause strength deterioration.
例２：
組成ＺｒＦ，（ ６ ２モル％）−ＢａＦ，（ ３ ０
モル％）−ＬａＦ３（４モル％）−Ａ２Ｆ，（４モル％
）のガラスロンドをコア（１次プリフォーム）トシ、こ
れを組成ＺｒＦ４（６１モル％）−ＢａＦ２（２９モル
％） 一ＬａＦ３（ ４モル％）−Ａ４Ｆ，（６モル％
）のジャケット管７に挿入し、２次プリフォームとし、
ロッドインチューブ法で線引きした。Example 2: Composition ZrF, (62 mol%)-BaF, (30
mol%)-LaF3(4 mol%)-A2F,(4 mol%
) to the core (primary preform), which has the composition ZrF4 (61 mol%) - BaF2 (29 mol%) - LaF3 (4 mol%) - A4F, (6 mol%)
) is inserted into the jacket tube 7 to form a secondary preform.
Lines were drawn using the rod-in-tube method.
線引きに先立ち、２次プリフォームを炉芯管！内に導入
した後、ガス導入口／よりＦ，（１０％）−Ａｒ（９０
％）混合ガスを導入しつつ、前記２次プリフォームを線
引き炉乙により２７０℃で３時間加熱した。この後、ガ
ス排気管コより支持管本体３内が負圧になるように調節
しつつ、炉芯管ｊ内を３５０℃に加熱し線引きした。負
圧にすることは１次プリフォームとジャケット管７の密
着を良くするためである。Before drawing, the secondary preform is made into a furnace core tube! After introducing F, (10%)-Ar (90%) from the gas inlet/
%) while introducing the mixed gas, the secondary preform was heated at 270° C. for 3 hours in a drawing furnace. Thereafter, the inside of the furnace core tube j was heated to 350° C. and wire was drawn while adjusting the pressure inside the support tube main body 3 to be negative from the gas exhaust pipe. The purpose of creating a negative pressure is to improve the adhesion between the primary preform and the jacket tube 7.
得られた光ファイバの損失を測定したところ、２．９μ
ｍに現われるＯＨ基の基本振動による吸収損失は３０ｄ
Ｂ／Ｋｍであった。When the loss of the obtained optical fiber was measured, it was found to be 2.9μ.
The absorption loss due to the fundamental vibration of the OH group appearing in m is 30d
It was B/Km.
前記工程を取らないで線引．きした場合、該損失は１
０ ０ ０ ｄＢ／Ｋｍ程あることから、ＯＨ吸収損失
は３０分の１以下にできたことになる。Line drawing without taking the above steps. , the loss is 1
Since it is about 0 0 0 dB/Km, the OH absorption loss can be reduced to less than 1/30.
本発明の線引き方法によれば、フッ化物光ファイバのロ
ッドインチューブ法による線引きによっても低損失な光
ファイバが得られることが判明した。It has been found that according to the drawing method of the present invention, a low-loss optical fiber can be obtained even by drawing a fluoride optical fiber using the rod-in-tube method.
以上の実施例では、含ハロゲンガスとしてＦ，ガスを用
いたが、この他に、ＨＦ，ＮＦ． ＢＦ，、ＣＦ４な
どのフッ素系ガスまたはこれらの混合ガス、あるいはＣ
ノ，、ＨＣノ などの塩素系ガスまたはこれらの混合ガ
スを用いても実施例と同様な結果が得られた。In the above embodiments, F gas was used as the halogen-containing gas, but in addition to this, HF, NF. Fluorine gas such as BF, CF4 or a mixture thereof, or C
Similar results to those in the Examples were obtained using chlorine-based gases such as HC, HC, and mixed gases thereof.
また含ハロゲンガスにより支持管が腐食されることがな
いように、アルミニウム、モネル合金、銅、ニッケル等
の耐食性のある材質で支持管は作製されることが好まし
い。Further, in order to prevent the support tube from being corroded by the halogen-containing gas, the support tube is preferably made of a corrosion-resistant material such as aluminum, Monel alloy, copper, or nickel.
発明の効果
本発明の前記構成に基づく線引き方法によれば、ジャケ
ット線引き方法においてのガラスロッドあるいはプリフ
ォームおよびジャケット管の界面における水酸基が除去
できるため、損失特性の優れた、また機械的強度が高い
フッ化物光ファイバが得られるという効果を生ずる。Effects of the Invention According to the wire drawing method based on the above configuration of the present invention, the hydroxyl groups at the interface between the glass rod or preform and the jacket tube in the jacket wire drawing method can be removed, resulting in excellent loss characteristics and high mechanical strength. The effect is that a fluoride optical fiber is obtained.
【図面の簡単な説明】
図は本発明のフッ化物光ファイバの線引き方法を実施す
る装置の構成概略図を示す。
ｌ：ガス導入管、 コ：ガス排気管、
３：支持管本体、 ３０：線引き用支持管、弘：炉芯管
、 ｊ：コネクター
Ａ二線引き炉、 ７：ジャケット管・
ｔ：１次プリフォーム、 タ：ノズル、ｌＯ：支持管本
体３と炉芯管≠のシーリング。BRIEF DESCRIPTION OF THE DRAWINGS The figure shows a schematic diagram of the configuration of an apparatus for carrying out the method of drawing a fluoride optical fiber according to the present invention. l: Gas introduction pipe, K: Gas exhaust pipe, 3: Support pipe body, 30: Support pipe for wire drawing, Hiroshi: Furnace core tube, j: Connector A double drawing furnace, 7: Jacket pipe, t: Primary preform , Ta: Nozzle, lO: Sealing between support tube body 3 and furnace core tube≠.
Claims (1)
ロッドあるいはフッ化物ガラスプリフォームを挿入し、
前記ジャケット管と前記ガラスロッドまたはガラスプリ
フォームを加熱し一体化して線引きするフッ化物光ファ
イバの線引き方法において、前記ジャケット管内および
上部空間の空気を含ハロゲンガスの不活性ガスで置換し
、前記ジャケット管と前記ガラスロッドまたはガラスプ
リフォームを所定温度で所定時間加熱し、前記不活性ガ
スを負圧とした後加熱し乾燥不活性ガスを吹き付けつつ
線引きするフッ化物光ファイバの線引き方法。 ２、大径の円筒体の支持管本体内に小径の円筒体のガス
導出管を配設して天井板部より貫通して突出し、前記支
持管本体の上部にガス排出管を設け、下部の外周面にコ
ネクターを固定した線引き用支持管の前記コネクターに
フッ化物からなるジャケット管を固定し、上部に乾燥不
活性ガスを導入するノズルを設けた炉芯管に上部より挿
入して画定し、前記炉芯管の外部に線引炉を配設したフ
ッ化物光ファイバの線引き装置。[Claims] 1. Inserting a fluoride glass rod or a fluoride glass preform into a jacket tube made of fluoride,
In the method for drawing a fluoride optical fiber, in which the jacket tube and the glass rod or glass preform are heated and integrated and drawn, the air in the jacket tube and the upper space is replaced with an inert gas containing a halogen gas, and the jacket A method for drawing a fluoride optical fiber, which comprises heating a tube and the glass rod or glass preform at a predetermined temperature for a predetermined time, and then drawing the inert gas while heating and blowing dry inert gas. 2. A small-diameter cylindrical gas outlet pipe is disposed within the large-diameter cylindrical support pipe body, penetrating and protruding from the ceiling plate, a gas discharge pipe is provided at the upper part of the support pipe body, and a gas discharge pipe is provided at the lower part of the support pipe body. A jacket tube made of fluoride is fixed to the connector of a support tube for wire drawing with a connector fixed to the outer peripheral surface, and the tube is inserted from the top into a furnace core tube provided with a nozzle for introducing dry inert gas at the top to define the tube. A drawing apparatus for a fluoride optical fiber, in which a drawing furnace is disposed outside the furnace core tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1114786A JP2799730B2 (en) | 1989-05-08 | 1989-05-08 | Method and apparatus for drawing fluoride optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1114786A JP2799730B2 (en) | 1989-05-08 | 1989-05-08 | Method and apparatus for drawing fluoride optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02293342A true JPH02293342A (en) | 1990-12-04 |
| JP2799730B2 JP2799730B2 (en) | 1998-09-21 |
Family
ID=14646649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1114786A Expired - Lifetime JP2799730B2 (en) | 1989-05-08 | 1989-05-08 | Method and apparatus for drawing fluoride optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2799730B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1025476C2 (en) * | 2004-02-12 | 2005-08-15 | Draka Fibre Technology Bv | Rod in tube method for producing optical fibres, comprises reducing pressure inside cavity between rod and tube during heating and flushing with inert gas |
-
1989
- 1989-05-08 JP JP1114786A patent/JP2799730B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1025476C2 (en) * | 2004-02-12 | 2005-08-15 | Draka Fibre Technology Bv | Rod in tube method for producing optical fibres, comprises reducing pressure inside cavity between rod and tube during heating and flushing with inert gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2799730B2 (en) | 1998-09-21 |
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