JPS59137333A - Manufacture of base material for optical fiber - Google Patents

Manufacture of base material for optical fiber

Info

Publication number
JPS59137333A
JPS59137333A JP735883A JP735883A JPS59137333A JP S59137333 A JPS59137333 A JP S59137333A JP 735883 A JP735883 A JP 735883A JP 735883 A JP735883 A JP 735883A JP S59137333 A JPS59137333 A JP S59137333A
Authority
JP
Japan
Prior art keywords
base material
flame
optical fiber
gas
contg
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
Application number
JP735883A
Other languages
Japanese (ja)
Inventor
Shoichi Sudo
昭一 須藤
Motohiro Nakahara
基博 中原
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP735883A priority Critical patent/JPS59137333A/en
Publication of JPS59137333A publication Critical patent/JPS59137333A/en
Pending 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
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners
    • 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
    • C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/30—For glass precursor of non-standard type, e.g. solid SiH3F
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/36—Fuel or oxidant details, e.g. flow rate, flow rate ratio, fuel additives
    • C03B2207/38—Fuel combinations or non-standard fuels, e.g. H2+CH4, ethane

Abstract

PURPOSE:To manufacture efficiently a base material for an optical fiber contg. F while preventing the corrosion of fine glass particles with HF by using an inflammable gas not contg. H2 and its compound as a combustion gas for a flame for synthesizing fine glass particles. CONSTITUTION:A starting member placed in a reaction vessel 6 is pulled up with a rotating and pulling device 9. At the same time, SiCl4 and a starting material for adding fluorine are fed from a starting material feeder 1 to a synthesizing torch 3, and an inflammable gas not contg. H and its compound such as gaseous CO, gaseous O2 and an inert gas for a flame are also fed from a gas feeder 2. Fine glass particles are formed in a flow 4 of a flame, and the particles are deposited on the starting member to form a porous base material 5. The base material 5 is sintered by heating to 1,500-1,600 deg.C with a heating element 7 to obtain a transparent base material 8 for an optical fiber contg. F.

Description

【発明の詳細な説明】 本発明は光フアイバ母材の製造方法に関する。[Detailed description of the invention] The present invention relates to a method for manufacturing an optical fiber preform.

従来、火炎内でガラス微粒子を合成し、これを軸方向に
付着、堆積して多孔質母材を形成した後、該多孔質母材
を焼結、透明ガラス化して透明母材を得る光ファイバの
製造法、すなわちＶＡＤ法では、ガラス微粒子を合成す
るための火炎用ガスとしては、可燃性ガスとして水素（
Ｈ２）が、また助燃性ガスとして酸素（０２）が使用さ
れていた。しかしながらこのＨ２−０２炎を使用し、Ｖ
ＡＤ法によって、フッ素（Ｆ）を添加した母材を作製し
ようとすると、火炎内において、フッ化水素（ＨＦ）が
生成され、このＨＦによって５ｉＣｅ、から合成された
ＳｉＯが侵触されるために、５１０２ガラス微粒子の形
成、さらには多孔質ガラス母材の形成が困難となり、光
フアイバ母材を製造できないという欠点があった。Conventionally, optical fibers have been produced by synthesizing glass particles in a flame, adhering and depositing them in the axial direction to form a porous base material, and then sintering the porous base material and turning it into transparent glass to obtain a transparent base material. In the production method, that is, the VAD method, hydrogen (
H2) was used, and oxygen (02) was used as a combustion supporting gas. However, using this H2-02 flame, V
When attempting to produce a base material to which fluorine (F) is added by the AD method, hydrogen fluoride (HF) is generated in the flame, and this HF attacks SiO synthesized from 5iCe. 5102 has the disadvantage that it becomes difficult to form glass particles and furthermore to form a porous glass preform, making it impossible to manufacture an optical fiber preform.

本発明はこれらの欠点を除去するために、ガラス微粒子
合成火炎用の燃焼ガスとして、水素およびその化合物を
含まない可燃性ガス（たとえば−酸化炭素）を使用する
ものであり、その目的は、ＶＡＤ法によってフッ素（Ｆ
）を添加した光フアイバ母材の製造を可能にすることに
ある。In order to eliminate these drawbacks, the present invention uses a combustible gas (for example - carbon oxide) that does not contain hydrogen and its compounds as the combustion gas for the glass particle synthesis flame, and its purpose is to Fluorine (F
) to enable the production of an optical fiber base material.

図は本発明の一実施例を示し、ｌはＳＩＣ／、およびフ
ッ素添加用原料、等のガラス原料供給装置、２は酸素、
不活用ガスおよび水素または水素化合物を含まない可燃
性ガス等の火炎用ガス供給装置、３は合成トーチ、４は
火炎流、５は多孔質母材、６は反応容器、７は加熱体、
８はフッ素を添加した透明母材、９は回転・引上げ装置
である。The figure shows an embodiment of the present invention, l is a glass raw material supply device for SIC/, and raw materials for fluorine addition, etc., 2 is oxygen,
A flame gas supply device such as a combustible gas that does not contain unused gas and hydrogen or hydrogen compounds, 3 is a synthesis torch, 4 is a flame stream, 5 is a porous base material, 6 is a reaction vessel, 7 is a heating body,
8 is a transparent base material to which fluorine is added, and 9 is a rotating/pulling device.

図に示す実施例において、原料供給装置１からトーチ８
へ供給された５ｉｃｅ、およびフッ素添加用原料は、水
素および水素化合物を含まない可燃性ガス、酸素ガス、
不活性カスによって形成される火炎流４内において、ガ
ラス微粒子となり、多孔質母材５か形成される。形成さ
れた多孔質母材５は、上部に設けられた発熱体７によっ
て、１５００〜１６００℃の温度下において焼結され、
フッ素を含んだ透明シリカガラス母材８となる。In the embodiment shown in the figure, from the raw material supply device 1 to the torch 8
The 5ice and the raw materials for fluoridation supplied to the
In the flame flow 4 formed by the inert dregs, the glass becomes fine particles and a porous base material 5 is formed. The formed porous base material 5 is sintered at a temperature of 1500 to 1600°C by a heating element 7 provided on the upper part,
A transparent silica glass base material 8 containing fluorine is obtained.

そこで、フッ素添加用原料ガスとしてＳＦ６を、また水
素化合物を含まない可燃性ガスとして一酸化炭素（ｃｏ
）を使用し、ＳｉＣ〜：５、ＳＦ６：　ｌの体積比のガ
ラス原料ガスを、該Ｃｏ　−０２−Ａｒ炎に供給してガ
ラス微粒子を合成し、さらに多孔質母材を形成した。次
いで形成した多孔質母材をＨｅガス雰囲気下、１５００
℃の温度で焼結し、透明母材を得た。得られた透明母材
を石英管内に封入し純シリカガラスとの屈折率の差を干
渉顕微鏡で調べたところ、透明母材と純シリカガラスの
屈折率の差は、０．Ｌ１１６程度、すなわち比屈折率差
Δｎ＝１゜１％であった。Therefore, SF6 is used as a raw material gas for fluoridation, and carbon monoxide (CO) is used as a flammable gas that does not contain hydrogen compounds.
), a frit gas having a volume ratio of SiC~:5 and SF6:l was supplied to the Co-02-Ar flame to synthesize glass particles and further form a porous matrix. Next, the formed porous base material was heated for 1500 min in a He gas atmosphere.
A transparent base material was obtained by sintering at a temperature of °C. The obtained transparent base material was sealed in a quartz tube and the difference in refractive index between the transparent base material and pure silica glass was examined using an interference microscope, and it was found that the difference in refractive index between the transparent base material and pure silica glass was 0. It was about L116, that is, the relative refractive index difference Δn=1°1%.

さらにこのようにして得られたフッ素ドープシリカガラ
ス母材の中心に穴あけ加工を施し、この穴の中にＭＡＤ
法で合成した純シリカガラス母材を封入して、光フアイ
バ母材とした。この母材より、コア径５０μｍ、外径１
２５μｍ１比屈折率差Δｎ＝ｒ。１％の光ファイバを吻
引きし、損失を測定したところ、波長０．８５μｍで、
ｉ３　ｄＢ／ｋｍであつブこ。Furthermore, a hole was made in the center of the fluorine-doped silica glass base material obtained in this way, and the MAD was inserted into this hole.
A pure silica glass base material synthesized by the method was encapsulated to create an optical fiber base material. From this base material, the core diameter is 50 μm, the outer diameter is 1
25 μm 1 relative refractive index difference Δn=r. When a 1% optical fiber was pulled and the loss was measured, at a wavelength of 0.85 μm,
It's hot at i3 dB/km.

以上説明したように、火炎用ガスとして水素および水素
化合物を含まない可燃性ガスを使用することにより、Ｈ
Ｆによるガラス微粒子の侵触を防止できるので、ＭＡＤ
法によってフッ素を添加した母材を効率よく製造できる
利点がある。さらにこのフッ素ドープ母材をクラツド材
、ＶＡＤ法で、合成した純シリカガラス体をコア材とし
て使用すれば、低損失な光ファイバを容易に得られる利
点がある。As explained above, by using a combustible gas that does not contain hydrogen or hydrogen compounds as a flame gas, H
Since the invasion of glass particles by F can be prevented, MAD
This method has the advantage of being able to efficiently produce fluorine-added base materials. Furthermore, if this fluorine-doped base material is used as a clad material and a pure silica glass body synthesized by the VAD method is used as a core material, there is an advantage that a low-loss optical fiber can be easily obtained.

また本発明の方法は、火炎加水分解反応を基本として光
フアイバ母材を得る他の製造法、たとえは外付は法、等
にも適用可能である。Furthermore, the method of the present invention is also applicable to other manufacturing methods for obtaining an optical fiber base material based on a flame hydrolysis reaction, such as an external method.

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

図は本発明の一実施例図である。 ｌ・・・ｓｉｃｇ４およびフッ素添加用原料、等のガラ
ス原料供給装置、２・・・酸素ガス、不活性ガスおよび
水素または水素化合物を含まない可燃性ガス、等の火炎
用カス供給装置、３・・・合成トーチ、４・・・火炎流
、５・・・多孔質母材、６・・・反応容器、７・・・加
熱体、８・・・フッ素を添加した透明母材、９・・・回
転・引上げ装置。The figure shows an embodiment of the present invention. l... Glass raw material supply device for sicg4 and raw materials for fluoridation, etc., 2... Flame dregs supply device for oxygen gas, inert gas, and combustible gas not containing hydrogen or hydrogen compounds, etc., 3. ... Synthetic torch, 4... Flame flow, 5... Porous base material, 6... Reaction vessel, 7... Heating body, 8... Transparent base material added with fluorine, 9...・Rotating/lifting device.

Claims (1)

【特許請求の範囲】 Ｌ　火炎内でガラス微粒子を合成し、これを軸方向に付
着、堆積して多孔質母材を形成した後、該多孔質母材を
焼結、透明ガラス化して透明母材を得る光ファイバの製
造法において、該ガラス微粒子を合成するための火炎用
燃焼カスとして、水素およびその化合物を含まない可燃
性ガスを使用することを特徴とする光フアイバ母材の製
造方法。 ２　特許請求範囲第１項記載の光フアイバ母材の製造方
法において、可燃性ガスとして一酸化炭素を使用するこ
とを特徴とする光フアイバ母材の製造方法。[Claims] L: After synthesizing glass particles in a flame, adhering and depositing them in the axial direction to form a porous base material, the porous base material is sintered and made into transparent glass to form a transparent matrix. 1. A method for producing an optical fiber preform, characterized in that a combustible gas containing no hydrogen or its compounds is used as combustion scum for a flame for synthesizing the glass particles. 2. A method for manufacturing an optical fiber preform according to claim 1, characterized in that carbon monoxide is used as the combustible gas.
JP735883A 1983-01-21 1983-01-21 Manufacture of base material for optical fiber Pending JPS59137333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP735883A JPS59137333A (en) 1983-01-21 1983-01-21 Manufacture of base material for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP735883A JPS59137333A (en) 1983-01-21 1983-01-21 Manufacture of base material for optical fiber

Publications (1)

Publication Number Publication Date
JPS59137333A true JPS59137333A (en) 1984-08-07

Family

ID=11663733

Family Applications (1)

Application Number Title Priority Date Filing Date
JP735883A Pending JPS59137333A (en) 1983-01-21 1983-01-21 Manufacture of base material for optical fiber

Country Status (1)

Country Link
JP (1) JPS59137333A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172643A (en) * 1984-09-19 1986-04-14 Sumitomo Electric Ind Ltd Manufacture of optical fiber preform
US4627866A (en) * 1983-06-17 1986-12-09 Sumitomo Electric Industries Ltd. Method for producing optical fiber preform

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826208A (en) * 1971-08-09 1973-04-06

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826208A (en) * 1971-08-09 1973-04-06

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4627866A (en) * 1983-06-17 1986-12-09 Sumitomo Electric Industries Ltd. Method for producing optical fiber preform
JPS6172643A (en) * 1984-09-19 1986-04-14 Sumitomo Electric Ind Ltd Manufacture of optical fiber preform
JPH0583502B2 (en) * 1984-09-19 1993-11-26 Sumitomo Denki Kogyo Kk

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