JPS61286239A - Preparation of parent material for optical fiber - Google Patents

Preparation of parent material for optical fiber

Info

Publication number
JPS61286239A
JPS61286239A JP12746685A JP12746685A JPS61286239A JP S61286239 A JPS61286239 A JP S61286239A JP 12746685 A JP12746685 A JP 12746685A JP 12746685 A JP12746685 A JP 12746685A JP S61286239 A JPS61286239 A JP S61286239A
Authority
JP
Japan
Prior art keywords
glass
tube
optical fiber
core
fine particles
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
Application number
JP12746685A
Other languages
Japanese (ja)
Other versions
JPH0253377B2 (en
Inventor
Minoru Funaki
船木　稔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tatsuta Electric Wire and Cable Co Ltd
Original Assignee
Tatsuta Electric Wire and Cable Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tatsuta Electric Wire and Cable Co Ltd filed Critical Tatsuta Electric Wire and Cable Co Ltd
Priority to JP12746685A priority Critical patent/JPS61286239A/en
Publication of JPS61286239A publication Critical patent/JPS61286239A/en
Publication of JPH0253377B2 publication Critical patent/JPH0253377B2/ja
Granted legal-status Critical Current

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
    • C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
    • C03B37/01291—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process
    • C03B37/01297—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process by melting glass powder in a mould
    • 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
    • C03B37/01265—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt
    • C03B37/01274—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt by extrusion or drawing

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)
  • Glass Melting And Manufacturing (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To easily prepare a parent material of optical fiber capable of providing optical fiber having completely circular sectional shape by preventing deformation of fine particles for core glass by adjusting the pressure difference between the outside and the inside of a glass tube for clad glass filled with fine particles of the core glass and melting the fine particles for core glass by heating. CONSTITUTION:Foot ends of glass tubes 1 for completely circular clad glass are reduced to small diameter, and fine particles 2 for core glass having lower melting point than the material for forming the tube 1 are packed in the inside of the glass tube 1. The glass tube 1 is charged in an electric furnace 3 and a cover 4 is attached to the top of the tube. Gaseous He or Ar is introduced from an introducing port 6 of the cover 4, and the electric furnace 3 is heated to 700-1,200 deg.C. The fine particles 2 for core glass is dehydrated by flowing gaseous He or Ar contg. gaseous halogen from a foot end 5 on the tube 1. Then the foot end 5 of the tube 1 is closed and the tube is heated to near the melting point of the fine glass particles while flowing the gaseous He or Ar to melt the fine glass particles 2. In this stage, the pressure difference between the outside and inside of the tube 1 is adjusted by adjusting the pressure at the pressure adjusting port 7 to prevent deformation of the glass tube 1 for clad. Then, the temp. in the electric furnace 3 is lowered and the parent material for optical fiber is discharged.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、光ファイバ母材の製造方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an optical fiber preform.

〔従来の技術及びその問題点〕[Conventional technology and its problems]

光ファイバ母材を製造する方法の１つに、焼結行程を加
圧下で行なうことにより、蒸発し易い添加物を効果的に
ガラス体中に含有させる方法がある（特開昭５８−１２
５６２０号）。One of the methods for manufacturing optical fiber preforms is to carry out the sintering process under pressure to effectively incorporate additives that easily evaporate into the glass body (Japanese Patent Laid-Open No. 58-12
No. 5620).

この方法は、莫発し易い添加物をドープさせた原料ガラ
ス体を、高純度の石英ガラス製の容器に減圧下で封入す
る。次にこの容器を加圧用ガスを圧入し、前記容器を加
圧圧縮しながら、容器ごとガラス体を焼結して光ファイ
バ母材を得るものである。In this method, a raw material glass body doped with a volatile additive is sealed in a container made of high-purity quartz glass under reduced pressure. Next, pressurizing gas is injected into this container, and while compressing the container under pressure, the glass body is sintered together with the container to obtain an optical fiber preform.

ところが、この方法によると、ガラス容器自体に圧力を
加えてつぶしても、均等につぶれないため、真円形の光
ファイバ母材を得ることが困難であった。However, according to this method, even if the glass container itself is crushed by applying pressure, it is not crushed evenly, so it is difficult to obtain a perfectly circular optical fiber preform.

そこで、この発明は、容易に真円形の光ファイバ母材を
製造することができる方法を提供しようとするものであ
る。Therefore, it is an object of the present invention to provide a method for easily manufacturing a perfectly circular optical fiber preform.

〔問題点を解決するための手段〕[Means for solving problems]

この発明は、クラフト用ガラス管内に、このクラッド用
ガラス管の形成素材よりも融点が低いコア用ガラス微粒
子を充填した後、コア用ガラス微粒子が充填されたクラ
ッド用ガラス管を加熱し、クラッド用ガラス管の内外の
圧力差を調節してりランド用ガラス管の変形を防止しな
がらクラッド用ガラス管内のコア用ガラス微粒子を熔融
するものである。This invention involves filling a craft glass tube with core glass particles having a lower melting point than the material for forming the cladding glass tube, heating the cladding glass tube filled with the core glass particles, and heating the cladding glass tube filled with the core glass particles. The core glass fine particles in the clad glass tube are melted while preventing the land glass tube from deforming by adjusting the pressure difference between the inside and outside of the glass tube.

〔作用〕[Effect]

この方法においては、クラッド用ガラス管内においてコ
ア用ガラス微粒子が熔融してコア用ガラスが形成され、
この際クラッド用ガラス管の内外の圧力差が調節され、
クラッド用ガラス管の変形が防止されるので、真円形の
光ファイバ母材を得ることができる。In this method, core glass particles are melted in a cladding glass tube to form core glass,
At this time, the pressure difference between the inside and outside of the cladding glass tube is adjusted,
Since deformation of the cladding glass tube is prevented, a perfectly circular optical fiber preform can be obtained.

〔実施例〕〔Example〕

以下、この発明の詳細な説明する。 The present invention will be explained in detail below.

まず、石英管等からなる真円形のクラ７ド用ガラス管１
の一端を細くしぼって、その内部にコア用ガラス微粒子
２を充填する。このコア用ガラス微粒子２は、クラッド
用ガラス管１の形成素材よりも融点が低く、屈折率が高
い、例えば気相加水分解反応等で得られ、酸化ゲルマニ
ウム等でドープした石英微粒子等を使用することができ
、その粒径は０．１μ〜２００μ程度である。First, a perfect circular glass tube 1 made of quartz tube etc.
One end is squeezed thinly, and the core glass fine particles 2 are filled inside. The core glass particles 2 are made of quartz particles doped with germanium oxide or the like, which have a lower melting point and a higher refractive index than the material for forming the cladding glass tube 1, for example, obtained through a gas phase hydrolysis reaction. The particle size is about 0.1μ to 200μ.

次に、コア用ガラス微粒子２を充填したクラッド用ガラ
ス管１を電気炉３内に入れる。さらに、クラッド用ガラ
ス管上部に、ガスシール用蓋４を取りつける。電気炉３
は加減圧ロアおよび差圧計８を有し、クラッド用ガラス
管１の内側と、外側の圧力差を調整できるようになって
いる。Next, the cladding glass tube 1 filled with the core glass particles 2 is placed in an electric furnace 3. Furthermore, a gas sealing lid 4 is attached to the top of the cladding glass tube. electric furnace 3
has a pressurization lower and a differential pressure gauge 8, and is capable of adjusting the pressure difference between the inside and outside of the cladding glass tube 1.

この後、ガスシール用蓋４のガス等人口６からＨｅまた
はＡｒガスを流し、クラフト用ガラス管１内に水分が混
入しないようにしておく。さらに電気炉３を７００〜１
２００℃に昇温し、クラッド用ガラス管１の細くしぼっ
た側５からハロゲンガス例えばＣｌｚ等を含むＨｅまた
はＡｒガスを流しながら仮焼することによってコア用ガ
ラス微粒子２の脱水処理を行う。Thereafter, He or Ar gas is flowed from the gas port 6 of the gas sealing lid 4 to prevent moisture from entering the craft glass tube 1. Furthermore, electric furnace 3 is 700 to 1
The glass particles 2 for the core are dehydrated by raising the temperature to 200° C. and calcining them while flowing He or Ar gas containing a halogen gas, such as Clz, from the narrowed side 5 of the glass tube 1 for the cladding.

次いで、クラッド用ガラス管１の細くしぼ９た側５を閉
じ、ガスシール用蓋４にＨｅまたはＡｒガスを流したま
ま、電気炉３内の温度をコア用ガラス微粒子２の融点前
後まで昇温し、コア用ガラス微粒子２を熔融する。この
時、クラッド用ガラス管１の下部が球状に変形しないよ
うに、クラッド用ガラス管１の内外の差圧を、加減圧ロ
アの圧力で調整する。Next, the narrow, wrinkled side 5 of the glass tube 1 for cladding is closed, and while He or Ar gas is flowing through the gas sealing lid 4, the temperature in the electric furnace 3 is raised to around the melting point of the glass fine particles 2 for the core. Then, the core glass fine particles 2 are melted. At this time, the differential pressure between the inside and outside of the glass cladding tube 1 is adjusted by the pressure of the pressure reduction lower so that the lower part of the glass tube 1 for cladding is not deformed into a spherical shape.

この後、電気炉３内の温度を下げ、電気炉３から形成さ
れた光ファイバ母材を取り出す。Thereafter, the temperature inside the electric furnace 3 is lowered, and the formed optical fiber preform is taken out from the electric furnace 3.

〔効果〕〔effect〕

この発明は、以上のごときものであるから、真円形のク
ラッド用ガラス管内にコア用ガラスを有する光ファイバ
母材を容易に製造することができるという効果がある。Since the present invention is as described above, it has the advantage that it is possible to easily manufacture an optical fiber preform having a core glass in a perfectly circular cladding glass tube.

【図面の簡単な説明】[Brief explanation of drawings]

図面はこの発明の実施装置の一例を示す概略図である。 １・・・・・・クラッド用ガラス管、２・・・・・・コ
ア用ガラス微粒子。The drawing is a schematic diagram showing an example of an apparatus for implementing the present invention. 1... Glass tube for cladding, 2... Glass fine particles for core.

Claims (1)

【特許請求の範囲】[Claims] クラッド用ガラス管内に、このクラッド用ガラス管の形
成素材よりも融点が低いコア用ガラス微粒子を充填した
後、コア用ガラス微粒子が充填されたクラッド用ガラス
管を加熱し、クラッド用ガラス管の内外の圧力差を調節
してクラッド用ガラス管の変形を防止しながらクラッド
用ガラス管内のコア用ガラス微粒子を溶融することを特
徴とする光ファイバ母材の製造方法。After filling the cladding glass tube with core glass particles whose melting point is lower than that of the material for forming the cladding glass tube, the cladding glass tube filled with the core glass particles is heated, and the inside and outside of the cladding glass tube are heated. A method for producing an optical fiber preform, which comprises melting core glass particles in a cladding glass tube while preventing deformation of the cladding glass tube by adjusting the pressure difference.
JP12746685A 1985-06-10 1985-06-10 Preparation of parent material for optical fiber Granted JPS61286239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12746685A JPS61286239A (en) 1985-06-10 1985-06-10 Preparation of parent material for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12746685A JPS61286239A (en) 1985-06-10 1985-06-10 Preparation of parent material for optical fiber

Publications (2)

Publication Number Publication Date
JPS61286239A true JPS61286239A (en) 1986-12-16
JPH0253377B2 JPH0253377B2 (en) 1990-11-16

Family

ID=14960625

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12746685A Granted JPS61286239A (en) 1985-06-10 1985-06-10 Preparation of parent material for optical fiber

Country Status (1)

Country Link
JP (1) JPS61286239A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6543257B1 (en) * 1999-05-28 2003-04-08 The Furukawa Electric Co., Ltd. Dehydration and sintering apparatus for porous optical fiber preform
JP2012518586A (en) * 2009-02-22 2012-08-16 シリテック ファイバーズ エスエー Method, base material, and optical fiber for generating and processing base material
JP2017031009A (en) * 2015-08-03 2017-02-09 株式会社フジクラ Production method of optical fiber preform, optical fiber preform, and production method of optical fiber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56164027A (en) * 1980-05-23 1981-12-16 Nippon Telegr & Teleph Corp <Ntt> Production of optical fiber
JPS582232A (en) * 1981-06-23 1983-01-07 Sumitomo Electric Ind Ltd Manufacture of optical fiber
JPS591222A (en) * 1982-06-25 1984-01-06 Matsushita Electric Ind Co Ltd Manufacture of information recording medium

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56164027A (en) * 1980-05-23 1981-12-16 Nippon Telegr & Teleph Corp <Ntt> Production of optical fiber
JPS582232A (en) * 1981-06-23 1983-01-07 Sumitomo Electric Ind Ltd Manufacture of optical fiber
JPS591222A (en) * 1982-06-25 1984-01-06 Matsushita Electric Ind Co Ltd Manufacture of information recording medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6543257B1 (en) * 1999-05-28 2003-04-08 The Furukawa Electric Co., Ltd. Dehydration and sintering apparatus for porous optical fiber preform
JP2012518586A (en) * 2009-02-22 2012-08-16 シリテック ファイバーズ エスエー Method, base material, and optical fiber for generating and processing base material
JP2017031009A (en) * 2015-08-03 2017-02-09 株式会社フジクラ Production method of optical fiber preform, optical fiber preform, and production method of optical fiber

Also Published As

Publication number Publication date
JPH0253377B2 (en) 1990-11-16

Similar Documents

Publication Publication Date Title
US4941905A (en) Methods of soot overcladding an optical preform
US4938788A (en) Method of producing uniform silica glass block
JPS61266325A (en) Manufacture of long glass body,particularly preform for photoconductor
CA2283569C (en) High-purity silica glass fabricating method using sol-gel process
JPS61286239A (en) Preparation of parent material for optical fiber
JPS61232240A (en) Manufacture and apparatus for glass body
JP2813752B2 (en) Manufacturing method of optical waveguide preform
JP3434945B2 (en) Method for producing hollow silica glass preform for fiber
JPH09124332A (en) Production of preform for optical fiber
JPS6355132A (en) Production of preform for optical fiber
US4505871A (en) Method for manufacturing an object of silicon nitride
JPS61256937A (en) Production of optical fiber base material
JPS6227341A (en) Production of fused glass
SU744744A1 (en) Method of manufacturing ferrite articles
JPS6265947A (en) Production of base material for optical fiber
JPH0651139A (en) Production of optical fiber preform
JPS5888129A (en) Production of quartz vessel
JPS6042195B2 (en) Chrysoberyl single crystal manufacturing method
JPH04325430A (en) Production of optical fiber preform
JPS6054937A (en) Manufacture of preform rod
JPH0218294B2 (en)
JPH05238768A (en) Method for molding constant polarization optical fiber base material
JPH01115897A (en) Production of magnesium fluoride single crystal
JPS58113232A (en) Sintering of porous body
JPH01141828A (en) Production of quartz glass pipe