JPS59111939A - Manufacture of optical fiber matrix - Google Patents
Manufacture of optical fiber matrixInfo
- Publication number
- JPS59111939A JPS59111939A JP22274882A JP22274882A JPS59111939A JP S59111939 A JPS59111939 A JP S59111939A JP 22274882 A JP22274882 A JP 22274882A JP 22274882 A JP22274882 A JP 22274882A JP S59111939 A JPS59111939 A JP S59111939A
- Authority
- JP
- Japan
- Prior art keywords
- quartz glass
- optical fiber
- tube
- glass
- quartz
- 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
- C03B37/012—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
- C03B2201/02—Pure silica glass, e.g. pure fused quartz
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/10—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/14—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron and fluorine
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)
- Light Guides In General And Applications Therefor (AREA)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光通信用の光フアイバ母材の製造法に係り、特
に、ロッドインチューブ法による光フアイバ母材の製造
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an optical fiber preform for optical communications, and particularly to a method for manufacturing an optical fiber preform by a rod-in-tube method.
従来のロッドインチューブ法（以後ＲＴ法と記す）によ
る光フアイバ母材の製造は、石英ガラス管の内壁に（Ｂ
２０３−Ｆ−８ｉＯ２）系ガラス膜を形成させた後、
その中心に石英ガラスロッドを挿入して溶融一体化させ
ており、上記（Ｂ２０３−Ｆ−８ｉ０２）系ガラス膜を
作る際は一般に（ＢＦ３＋５ｉＣｔ、＋Ｏ，，）の混合
ガスを用いていた。このように（Ｂ２０３ Ｆ ＋
Ｓ ｉＱ ２）系ガラス膜を介在させたものは、石英コ
アとの間で−１，５％までの比屈折率差が得られるので
、石英コアを被覆するクラッド層として有用であった。The conventional rod-in-tube method (hereinafter referred to as RT method) is used to manufacture optical fiber preforms by attaching (B
After forming a 203-F-8iO2)-based glass film,
A quartz glass rod was inserted into the center and melted and integrated, and a mixed gas of (BF3+5iCt, +O, .) was generally used when making the above (B203-F-8i02) type glass film. Like this (B203 F +
A layer with an S iQ 2) glass film interposed therebetween was useful as a cladding layer covering a quartz core because a relative refractive index difference of up to -1.5% could be obtained with the quartz core.
しかるに上記石英ガラス管、（Ｂ２Ｏ２−Ｆ−８ｉ０２
）系ガラス膜及び石英コアを加熱一体化させる際には、
（Ｂ ２０３ Ｆ Ｓ ｉｏ ２）系ガラス膜の付
近に微小気泡が多数発生し、散乱損失が大きく低損失の
光フアイバ母材だけしか製造することができないという
欠点をもっていた。However, the above quartz glass tube (B2O2-F-8i02
) system glass membrane and quartz core are heated and integrated,
This method has the disadvantage that many microbubbles are generated near the (B 203 F S io 2) glass film, and the scattering loss is large, so that only a low-loss optical fiber base material can be manufactured.
本発明は上記従来技術の欠点を解消し、石英コアとクラ
ッドとの界面に気泡が存在しない低損失な光フアイバ母
材の製造法を提供することを目的とし、その特徴とする
ところは、石英ガラス管の内壁にＢ、２０３とＦとを含
む石英ガラス膜を形成した後、その上に８２０３を含む
石英ガラス膜を形成してこれらの中心に石英ガラスロッ
ドを挿入し、直立させた石英ガラスロッドの軸を中心と
して石英ガラス管と石英ガラスロッドを回転させ、石英
ガラス管の側方より酸水素炎を吹き付は乍ら上方に移動
させることにより融着一体化することにある。The present invention aims to solve the above-mentioned drawbacks of the prior art and provide a method for manufacturing a low-loss optical fiber base material in which no air bubbles are present at the interface between the quartz core and the cladding. After forming a quartz glass film containing B, 203 and F on the inner wall of a glass tube, a quartz glass film containing 8203 is formed thereon, and a quartz glass rod is inserted into the center of the quartz glass film to stand upright. The quartz glass tube and the quartz glass rod are rotated about the axis of the rod, and oxyhydrogen flame is blown from the side of the quartz glass tube while moving upward to fuse and integrate them.
第１図は本発明の一実施例である光フアイバ母材の製造
法の説明図である。１は外径２０ｍｍ、厚す１．５ ｍ
ｍの石英ガラス管、２は石英ガラス管１の内面に付着さ
せたＣＢ ２０３−Ｆ −８ｉ Ｏ２）系ガラス膜、６
はこのガラス膜２の上に付着させた（Ｂ２０３−８ｉｎ
２） 系のガラス膜で、その中心に石英ガラスロッド
４が設置されている。即ち、石英ガラス管１内にＳ ｉ
ｃｔ ４２０００ｍｇ／ｍｍ、 ＥＦ ３５００ ｃ
ｃ／ｍｍ。FIG. 1 is an explanatory diagram of a method for manufacturing an optical fiber base material according to an embodiment of the present invention. 1 has an outer diameter of 20 mm and a thickness of 1.5 m.
2 is a CB 203-F -8i O2)-based glass film attached to the inner surface of the quartz glass tube 1, 6
was attached on this glass film 2 (B203-8in
2) A quartz glass rod 4 is installed in the center of the system glass membrane. That is, S i in the quartz glass tube 1
ct 42000mg/mm, EF 3500c
c/mm.
０２１００ＣＪｃｃ／ｍ１ｙｒの流速でこれらの混合ガ
スを送シ、加熱源である酸水素バーナ６を上下動させて
石英ガラス管１の内壁に上記（Ｂ ２０３−Ｆ−８１ｏ
２）系ガラス膜２を形成させた後、Ｓ ｉ Ｃｔ４４０
０ｍ＠／Ｉ＋ｍ。The above (B 203-F-81o
2) After forming the glass film 2, Si Ct440
0m@/I+m.
ＢＣＬ ３５ ｃ ｃ／ｍｉｎ、 ０２１００００ｃ汐
ｉｎ の混合ガスを送り、バーナ６を移動させ乍ら（Ｂ
、、０３−８ ｉｏ ２）系のガラス膜６を６０μｍ
厚さに形成させる。A mixed gas of BCL 35 c c/min and 0.210000 c/min was sent, while the burner 6 was moved (B
,,03-8 io 2) glass film 6 of 60 μm
Form into a thick layer.
最後に外径６簡の石英ガラスロッド４を中心に挿入して
いる。上記作業は竪型ガラス旋盤５に垂直に取り付け、
回転させ乍ら酸水素バーナ６を下部より上方に移動させ
て行ない、最後に上記石英ロッド４を中心に設置して全
体を溶融一体化させている。Finally, a quartz glass rod 4 with an outer diameter of 6 pieces is inserted centrally. The above work is carried out by installing the machine vertically on the vertical glass lathe 5.
While rotating, the oxyhydrogen burner 6 is moved upward from the lower part, and finally the quartz rod 4 is placed in the center and the whole is melted and integrated.
第２図は第１図で説明した方法で製造した光フアイバ母
材の直径方向における屈折率分布図で、外側と中央の比
較的屈折率の高い部分は石英ガラス管１及び石英ガラス
ロッド４の部分である。また、その間の環状の低屈折率
の第１クラツド８は（Ｂ２０Ｂ Ｆ−８ＺＯ２）系ガ
ラス膜２の部分であり、これよシも屈折率が大きい環状
の第２クラツド９は（Ｂ ２Ｑ ３−８ｉＯ２）系ガラ
ス膜６の部分である。FIG. 2 is a refractive index distribution diagram in the diametrical direction of the optical fiber base material manufactured by the method explained in FIG. It is a part. The annular first cladding 8 with a low refractive index between them is a part of the (B20B F-8ZO2) glass film 2, and the annular second cladding 9 with a higher refractive index is a part of the (B20B F-8ZO2) glass film 2. 8iO2)-based glass film 6.
したがって、石英ガラスロッド４の部分を通過する光束
はこの中に封じ込められて効率良く伝送されることにな
る。Therefore, the light beam passing through the quartz glass rod 4 is confined therein and efficiently transmitted.
しかるに（Ｂ１０３ Ｓ ｉｏ ２）系ガラス膜６を
形成する際には（Ｂ２０８−Ｆ−８ｉＯ２）系ガラス膜
２も強熱されてＢ２０ＢやＦ等のガスが発生して異種ガ
ラスとの界面に停帯し易くなる。このことはＢＦ３ガス
と０２ガスとを石英ガラス管内で加熱反応させると、石
英ガラス管内壁に気泡が発生することから上記のことが
推定される。However, when forming the (B103 S io 2) type glass film 6, the (B208-F-8iO2) type glass film 2 is also ignited and gases such as B20B and F are generated and stopped at the interface with the different glass. It becomes easier to wear. This is inferred from the fact that when BF3 gas and 02 gas are heated and reacted in a quartz glass tube, bubbles are generated on the inner wall of the quartz glass tube.
（Ｚ？ ２０３ Ｓ ｉｏ ２）系のガラス膜６を６０
ｐｍ以上の厚さにすると、（Ｂ２０３ ｐ ｓｉｏ
２）系ガラス膜２からのＦの拡散をここで阻止すること
ができる。(Z? 203 S io 2) system glass film 6 at 60
When the thickness is greater than pm, (B203 p sio
2) Diffusion of F from the glass film 2 can be prevented here.
また、屈折率分布を示す第２図において、第１クラツド
８と第２クラツド９の境面が不明瞭になっているのは、
第１クラツド８のＦが第２クラツド９中へ拡散分布した
ことによるものである。In addition, in FIG. 2 showing the refractive index distribution, the boundary between the first clad 8 and the second clad 9 is unclear because
This is due to the fact that F in the first cladding 8 is diffused and distributed into the second cladding 9.
本実施例の光フアイバ母材の製造法は１石英ガラス管の
内面に（Ｂ２０３ ｐ ｓｉｏ ２）系ガラス膜を付
着させ、更にその内側に（Ｂ２０３Ｓ ｔ Ｑ ２）系
ガラス膜を６０μｍ以上の厚さで付着させ、その中心に
石英ガラスロッドを挿入して全体を回転させ乍ら酸水素
炎を吹き付は乍ら・（−すを上方に移動させることによ
り、（Ｂ１０３ ’ Ｆ Ｓ ｓ Ｑ ２）系ガラス
膜中のＦの（Ｂ、、□ Ｂ−８ｉｏ ２）系ガラス膜中
への拡散を許して気泡の発生を防止し、光伝送効率を向
上させることができる。The manufacturing method of the optical fiber base material of this example is as follows: 1. A (B203 p sio 2) glass film is attached to the inner surface of a quartz glass tube, and a (B203S t Q 2) glass film with a thickness of 60 μm or more is further coated on the inside of the (B203 p sio 2) glass film. (B103' F S s Q 2 ) type glass film can be allowed to diffuse into the (B,, □ B-8io 2) type glass film, thereby preventing the generation of bubbles and improving light transmission efficiency.
また、低屈折率差の得られるＢ２Ｏ３やＦを含む石英ガ
ラスを容易に光ファイバに利用することができるという
効果をもっている。Further, it has the effect that silica glass containing B2O3 and F, which provides a low refractive index difference, can be easily used for optical fibers.
本発明の光フアイバ母材の製造法は、コアとクラッドの
界面に気泡のない低損失光コアイノ（の母材が得られる
という効果が得られる。The method for producing an optical fiber preform of the present invention has the effect of producing a low-loss optical fiber preform without bubbles at the interface between the core and the cladding.
第１図は本発明の一実施例である光ファイ・く母材の製
造法の説明図、第２図は第１図で説明した方法で製造し
た光フアイバ母材の直径方向における屈折率分布図であ
る。
１：石英ガラス管、２：（Ｂ２０８−、Ｆ−８ｉＯ２）
系ガラス膜、６： （Ｂ２０ Ｂ Ｓ ｉｏ ２）系ガ
ラス膜、４：石英ガラスロッド、５：竪型ガラス旋盤、
６二酸水素バーナ、７：光フアイバ母材、８：第１クラ
ツド、９：第２クラツド。
贋 １ 圀
蒸 ２ ｍ
り
（３）Figure 1 is an explanatory diagram of a method for manufacturing an optical fiber base material according to an embodiment of the present invention, and Figure 2 is a refractive index distribution in the diametrical direction of the optical fiber base material manufactured by the method explained in Figure 1. It is a diagram. 1: Quartz glass tube, 2: (B208-, F-8iO2)
system glass film, 6: (B20 B S io 2) system glass film, 4: quartz glass rod, 5: vertical glass lathe,
6 hydrogen dioxide burner, 7: optical fiber base material, 8: first clad, 9: second clad. Counterfeit 1 piece 2 meters (3)
Claims (1)
Ｆ（フッ素）とを含む石英ガラス膜を形成した後、その
上に上記Ｂ２Ｏ３を含む石英ガラス膜を形成してこれら
の中心に石英ガラスロッドを挿入し、直立させた上記石
英ガラスロッドの軸を中心として上記石英ガラス管と上
記石英ガラスロッドを回転させ、上記石英ガラス管の側
方よシ酸水素炎を吹き付は乍ら上方に移動させることに
より融着一体化することを特徴とする光フアイバ母材の
製造法。 ２、上記Ｂ ２ＯＢを含む石英ガラス膜が、６０μｍ以
上の厚さを有する層である特許請求の範囲第１項記載の
光フアイバ母材の製造法。[Claims] 1. After forming a quartz glass film containing B 2Q s (boric acid) and F (fluorine) on the inner wall of a quartz glass tube, the quartz glass film containing B 2 O 3 is formed thereon. A quartz glass rod is inserted into the center of these, and the quartz glass tube and the quartz glass rod are rotated around the axis of the upright quartz glass rod, and a hydrogen silica flame is blown from the side of the quartz glass tube. A method for producing an optical fiber base material, characterized in that the optical fiber base material is fused and integrated by moving it upward while attaching it. 2. The method for producing an optical fiber base material according to claim 1, wherein the quartz glass film containing B2OB is a layer having a thickness of 60 μm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22274882A JPS59111939A (en) | 1982-12-17 | 1982-12-17 | Manufacture of optical fiber matrix |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22274882A JPS59111939A (en) | 1982-12-17 | 1982-12-17 | Manufacture of optical fiber matrix |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59111939A true JPS59111939A (en) | 1984-06-28 |
Family
ID=16787284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22274882A Pending JPS59111939A (en) | 1982-12-17 | 1982-12-17 | Manufacture of optical fiber matrix |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59111939A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000027767A1 (en) * | 1998-11-09 | 2000-05-18 | Heraeus Quarzglas Gmbh & Co. Kg | Quartz glass tube for use in the production of optical fiber preforms |
-
1982
- 1982-12-17 JP JP22274882A patent/JPS59111939A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000027767A1 (en) * | 1998-11-09 | 2000-05-18 | Heraeus Quarzglas Gmbh & Co. Kg | Quartz glass tube for use in the production of optical fiber preforms |
| KR100345358B1 (en) * | 1998-11-09 | 2002-07-24 | 신에쯔 세끼에이 가부시키가이샤 | Quartz glass tube for optical fiber preform and manufacturing method therefor |
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