JPS59137332A - Manufacture of base material for optical fiber - Google Patents

Manufacture of base material for optical fiber

Info

Publication number
JPS59137332A
JPS59137332A JP735683A JP735683A JPS59137332A JP S59137332 A JPS59137332 A JP S59137332A JP 735683 A JP735683 A JP 735683A JP 735683 A JP735683 A JP 735683A JP S59137332 A JPS59137332 A JP S59137332A
Authority
JP
Japan
Prior art keywords
base material
core
silica glass
optical fiber
flame
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
JP735683A
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 JP735683A priority Critical patent/JPS59137332A/en
Publication of JPS59137332A publication Critical patent/JPS59137332A/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
    • C03B2207/50—Multiple burner arrangements

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (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

PURPOSE:To manufacture an inexpensive base material for an optical fiber by depositing fine powder of silica glass contg. F synthesized with a synthesizing torch for a clad on the side of a porous base material made of pure silica glass formed with a synthesizing torch for a core. CONSTITUTION:A starting member 10 placed in a protective vessel 9 is pulled up with a rotating and pulling device 11. At the same time, SiCl4 and gases for a flame are fed to a synthesizing torch 1 for a core, fine powder of pure silica glass is synthesized in a flow 3 of a flame, and the powder is deposited to form a porous base material 5 for a core. SiCl4, SF6 and gases for a flame are then fed to a synthesizing torch 2 for a clad, fine powder of silica glass contg. F is synthesized in a flow 4 of a flame, and the powder is deposited on the side of the base material 5 to form a porous layer 6 for a clad. The base material 5 and the layer 6 are sintered by heating to 1,500-1,600 deg.C with a heating element 7 to obtain a transparent base material 8. Thus, a base material for a multimode or single-mode optical fiber having a core-clad structure can be manufactured without using any expensive dopant.

Description

【発明の詳細な説明】 従来、火炎加水分解で合成したガラス微粒子を軸方向に
堆積して多孔質母材を形成した後、これを加熱・焼結し
て透明母材を得る光フアイバ母材の製造方法、すなわち
ＶＡＤ法では、コア用合成トーチで、Ｓｉｎ２，　Ｇｅ
ｍ２，　Ｐ２Ｏ，、等を含むガラス微粒子を合成し、こ
れを堆積してＳｉＯ　−ＧｅＯ２−Ｐ２０５ガラスから
成る多孔質母材を形成し、さらに該多孔質母材の側面に
、クラッド用合成トーチによって合成したＳｉＯ□ガラ
ス微粒子、または８ｉ０，　−　Ｂ２０８ガラス微粒子
を堆積してクラッド層を形成した後、加熱・焼結してコ
ア・クラッド構造を有する光フアイバ母材を得ていた。[Detailed Description of the Invention] Conventionally, an optical fiber base material is obtained by depositing glass particles synthesized by flame hydrolysis in the axial direction to form a porous base material, and then heating and sintering this to obtain a transparent base material. In the manufacturing method, that is, the VAD method, a core synthesis torch is used to synthesize Sin2, Ge
Glass fine particles containing m2, P2O, etc. are synthesized and deposited to form a porous base material made of SiO-GeO2-P205 glass, and then the sides of the porous base material are coated with a cladding synthesis torch. After depositing synthesized SiO□ glass particles or 8i0,-B208 glass particles to form a cladding layer, heating and sintering was performed to obtain an optical fiber base material having a core-clad structure.

このように従来のＶＡＤ法では、通常、コア・クラッド
構造を形成するためのコア材としてＳｉｎ２−　Ｇｅｍ
２−　Ｐ２０５ガラスを、またクラツド材としてはＳｉ
ｎ．ガラスまたはＳｉｎ２−　Ｂ２０８ガラスを使用し
ているので、光フアイバ母材の原料価格が高価となり、
光ファイバの低価格化を図る上で重大な問題となってい
た。As described above, in the conventional VAD method, Sin2-Gem is usually used as the core material to form the core-clad structure.
2- P205 glass and Si as cladding material
n. Since glass or Sin2-B208 glass is used, the raw material cost for the optical fiber base material is expensive.
This has become a serious problem in efforts to reduce the cost of optical fibers.

本発明はこれらの欠点を除去するために、ＶＡＤ法の多
孔質母材形成時に、コア用合成トーチによって形成した
純シリカガラス（純シリカガラス）から成る多孔質母材
の側面に、クラッド用合成トーチにより合成したフッ素
を含むシリヵガラス微粒子を付着、堆積してクラッド層
を形成した後、焼結してコア・クラッド構造を有する光
ファイバ母材を得るものであり、その目的は、原料価格
の安価な低価格光フアイバ母材の製造法を提供すること
にある１、 図は本発明の一実施例を示し、■はコア用合成トーチ、
２はクラッド用合成トーチ、３はＳｉＯ□ガラス微粒子
を含む火炎流、４はフッ素を添加したシリカカラス微粒
子を含む火炎流、５は純シリカガラス微粒子から成るコ
ア多孔質母材、６はフッ素を添加したシリカガラス微粒
子によって形成されたクラッド多孔質層、７は発熱体、
８はシリカガラスコア、およびフッ素を添加したシリカ
ガラスクラッドの構造を有する透明母材、９は保護容器
、１０゛は出発材、１１は回転・引上げ装置である。In order to eliminate these drawbacks, the present invention has developed a composite material for cladding on the side surface of a porous base material made of pure silica glass (pure silica glass) formed by a synthetic core torch when forming a porous base material using the VAD method. After adhering and depositing silica glass particles containing fluorine synthesized by a torch to form a cladding layer, it is sintered to obtain an optical fiber base material with a core-clad structure.The purpose is to reduce the cost of raw materials. The purpose of the present invention is to provide a method for manufacturing a low-cost optical fiber base material. 1. The figure shows an embodiment of the present invention, and ■ indicates a synthetic torch for the core;
2 is a synthetic torch for cladding, 3 is a flame stream containing SiO□ glass particles, 4 is a flame stream containing fluorine-doped silica glass particles, 5 is a core porous matrix made of pure silica glass particles, and 6 is a fluorine-added core porous matrix. A cladding porous layer formed by added silica glass particles, 7 a heating element,
8 is a transparent base material having a structure of a silica glass core and a fluorine-doped silica glass cladding, 9 is a protective container, 10 is a starting material, and 11 is a rotating/lifting device.

この方法によって光フアイバ母材を得るには、図に示す
実施例において、まずコア用合成トーチ１に５ｉｃｅ、
および０□、　Ｈ２，Ａｒ等の火炎用ガスを供給して、
火炎流８内においてシリカカラス微粒子を合成し、これ
を堆積してコア多孔質母材５を形成する。次いで該コア
多孔質母材の側面に、クラッド用合成トーチ２に５ｉｃ
ｅ、　、　ＳＦ６および０２、　Ｈ２＋　Ａｒを供給し
て、火炎流４内において合成したフッ素を添加したシリ
カガラス微粒子を堆積して、クラッド多孔質層６を形成
した後、１５００°Ｃ〜１６００℃に加熱・焼結し、シ
リカガラスコア、フッ素ドープクラッドの透明母材８を
得る。In order to obtain an optical fiber preform by this method, in the example shown in the figure, first, 5 ice,
and 0□, supplying flame gas such as H2, Ar, etc.
Silica glass fine particles are synthesized in the flame stream 8 and deposited to form the core porous matrix 5. Next, on the side of the core porous base material, a 5ic
e, , SF6 and 02, H2+ Ar were supplied to deposit the synthesized fluorine-added silica glass fine particles in the flame flow 4 to form the cladding porous layer 6, and then the temperature was raised to 1500 °C to 1600 °C. By heating and sintering, a transparent base material 8 having a silica glass core and a fluorine-doped cladding is obtained.

そこで、コアトーチにＳ　ＩＣｅ　４を毎分１００ｃｃ
。Therefore, we applied S ICe 4 to the core torch at 100cc per minute.
.

クラッドトーチにＳＦ６を１０％（体積比）含む５ｉＣ
１ｌ！、を毎分２００ｃｃそれぞれ供給して多孔質母材
を形成した後、１５００℃のＨｅガス雰囲気中で焼結し
て、透明母材を得た。5iC containing 10% SF6 (volume ratio) in cladding torch
1l! , were supplied at a rate of 200 cc per minute to form a porous base material, and then sintered in a He gas atmosphere at 1500° C. to obtain a transparent base material.

この透明母材を半径方向にｉ　ｍｍ厚に切断、研磨して
屈折率分布を干渉顕微鏡によって測定した結果、フッ素
添加したクラッド層シリカガラスとコアシリカガラスと
の比屈折率差（屈折率の差／１．４５８　）Δｎは、１
．５　％であり、クラッド層にはフッ素が２モル％程度
添加されていることが明らかになった。This transparent base material was cut and polished to a thickness of 1 mm in the radial direction, and the refractive index distribution was measured using an interference microscope. /1.458) Δn is 1
．． 5%, and it became clear that about 2 mol% of fluorine was added to the cladding layer.

さらにこの母材かもコア（シリカガラス）径５０μｍ１
外径１２５μｍのマルチモードファイバを線引きし、該
ファイバの損失を測定した結果、０．８５ｆｉｒｎで８
　ｄＢ／ｋｍであった。Furthermore, this base material may have a core (silica glass) diameter of 50 μm1
As a result of drawing a multimode fiber with an outer diameter of 125 μm and measuring the loss of the fiber, the loss was 8 at 0.85 firn.
It was dB/km.

また前述の実施例においてクラッド原料中の５Ｆ６１１
１ｋ度を２％とし、コアークラッドの比屈折率差を０．
３％とした透明母材を作製した後、該透明母材に石英管
をジャケットしコア径８μｍ１外径１２５μｍの単一モ
ードファイバを線引きした。得られた単一モードファイ
バの損失は１．１μｍでｌｄＢ／ｋｍであった。In addition, in the above-mentioned example, 5F611 in the cladding raw material
1k degree is 2%, and the relative refractive index difference of the core cladding is 0.
After preparing a transparent base material with a concentration of 3%, a quartz tube was jacketed on the transparent base material, and a single mode fiber having a core diameter of 8 μm and an outer diameter of 125 μm was drawn. The loss of the single mode fiber obtained was 1.1 μm and 1 dB/km.

またこの方法において、ごく少量のＧｅＯ□。Also in this method, a very small amount of GeO□.

Ｐ２Ｏ５，Ｂ２Ｏ３をコアまたはクラッドのドーパント
材として添加すると、フッ素の添加効率向上に効果的で
ある。Adding P2O5 or B2O3 as a core or cladding dopant material is effective in improving the efficiency of fluorine addition.

さらにこの方法において、グレーデッドファイバを得る
には、コアトーチ原料内に少量のフッ素添加剤（たとえ
は５Ｆ６）を混合し、コアシリカガラス内にフッ素添加
量分布を形成すればよい。Furthermore, in this method, in order to obtain a graded fiber, a small amount of fluorine additive (for example, 5F6) may be mixed into the core torch raw material to form a fluorine additive amount distribution within the core silica glass.

以上説明したように、本発明の光フアイバ母材゛の製造
方法により、ＧｅＯ２、Ｐ２Ｏ５、Ｂ２Ｏ８、等の高価
なドーパント材をほとんど使用せずに、コア・クラッド
構造を有するマルチモードおよび単一モード光ファイバ
母材を製造できるので、光ファイバの原料価格を低下し
、安価な光ファイバを提供できる利点がある。また本発
明の方法を使用することにより、ファイバ原料の資源上
の問題も解決できる利点がある。As explained above, by the method of manufacturing the optical fiber base material of the present invention, multimode and single mode fibers having a core-clad structure can be produced without using expensive dopant materials such as GeO2, P2O5, B2O8, etc. Since the optical fiber preform can be manufactured, there is an advantage that the raw material cost of the optical fiber can be reduced and an inexpensive optical fiber can be provided. Further, by using the method of the present invention, there is an advantage that problems regarding fiber raw material resources can be solved.

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

図は本発明の一実施例図である。 ■・・・コア用合成トーチ、２・・・クラッド用合成ト
ーチ、８・・・５１０２力ラス微粒子を含む火炎流、４
・・・フッ素を添加したシリカガラス微粒子を含む火炎
流、５・・・純シリカガラス微粒子から成るコア多孔質
母材、６・・・フッ素を添加したシリカガラスによって
形成されたクラッド多孔質層、７・・・発熱体、８・・
・シリカガラスコアおよびフッ素を添加したシリカガラ
スクラッドの構造を有する透明母材、９・・・保護容器
、１０・・・出発材、１１・・・回転・引上げ装置。 特お一出願人　日本電信也詰公社The figure shows an embodiment of the present invention. ■...Synthetic torch for core, 2...Synthetic torch for cladding, 8...Flame flow containing 5102 force lath fine particles, 4
... Flame flow containing fluorine-doped silica glass particles, 5... Core porous matrix consisting of pure silica glass particles, 6... Cladding porous layer formed of fluorine-doped silica glass, 7... Heating element, 8...
- Transparent base material having a structure of a silica glass core and a fluorine-added silica glass cladding, 9... Protective container, 10... Starting material, 11... Rotating/pulling device. Special applicant: Nippon Telegraph Corporation

Claims (1)

【特許請求の範囲】[Claims] ｔ　火炎加水分解で合成したガラス微粒子を軸方向に堆
積して多孔質母材を形成した後、これを加熱・焼結して
透明母材を得る光フアイバ母材の製造方法において、多
孔質母材の形成時にコア用合成トーチによって形成した
純シリカガラスから成る多孔質母材の側面に、クラッド
用合成トーチによって合成したフッ素を含むシリカガラ
ス微粒子を付着、堆積してクラッド層を形成した後、加
熱・焼結して、透明母材を得ることを特徴とする光フア
イバ母材の製造方法。t. In a method for producing an optical fiber base material, a porous base material is formed by depositing glass particles synthesized by flame hydrolysis in the axial direction, and then heated and sintered to obtain a transparent base material. After forming a cladding layer by attaching and depositing fluorine-containing fine silica glass particles synthesized using a cladding synthesis torch on the side surface of a porous base material made of pure silica glass formed using a core synthesis torch during material formation, A method for producing an optical fiber base material, which comprises heating and sintering to obtain a transparent base material.
JP735683A 1983-01-21 1983-01-21 Manufacture of base material for optical fiber Pending JPS59137332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP735683A JPS59137332A (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
JP735683A JPS59137332A (en) 1983-01-21 1983-01-21 Manufacture of base material for optical fiber

Publications (1)

Publication Number Publication Date
JPS59137332A true JPS59137332A (en) 1984-08-07

Family

ID=11663676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP735683A Pending JPS59137332A (en) 1983-01-21 1983-01-21 Manufacture of base material for optical fiber

Country Status (1)

Country Link
JP (1) JPS59137332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4880452A (en) * 1984-06-04 1989-11-14 Sumitomo Electric Industries, Ltd. Method for producing glass preform for optical fiber containing fluorine in cladding

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5515682A (en) * 1978-07-21 1980-02-02 Hisao Inoue Oil pressure vibration generator
JPS5792531A (en) * 1980-11-28 1982-06-09 Nippon Telegr & Teleph Corp <Ntt> Preparation of oxide powder rod for optical fiber
JPS57111259A (en) * 1981-08-10 1982-07-10 Sumitomo Electric Ind Ltd Light-piping path and its preparation
JPS581051A (en) * 1981-06-25 1983-01-06 Toshiba Corp Molybdenum alloy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5515682A (en) * 1978-07-21 1980-02-02 Hisao Inoue Oil pressure vibration generator
JPS5792531A (en) * 1980-11-28 1982-06-09 Nippon Telegr & Teleph Corp <Ntt> Preparation of oxide powder rod for optical fiber
JPS581051A (en) * 1981-06-25 1983-01-06 Toshiba Corp Molybdenum alloy
JPS57111259A (en) * 1981-08-10 1982-07-10 Sumitomo Electric Ind Ltd Light-piping path and its preparation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4880452A (en) * 1984-06-04 1989-11-14 Sumitomo Electric Industries, Ltd. Method for producing glass preform for optical fiber containing fluorine in cladding

Similar Documents

Publication Publication Date Title
EP0249230B1 (en) Glass preform for dispersion shifted single mode optical fiber and method for the production of the same
JPS5843336B2 (en) Manufacturing method of clad type optical glass fiber
JPS60226422A (en) Preparation of intermediate for single mode fiber
Blankenship et al. The outside vapor deposition method of fabricating optical waveguide fibers
EP0164103A2 (en) Method for producing glass preform for optical fiber containing fluorine in cladding
JPH0236535B2 (en)
JPS59137332A (en) Manufacture of base material for optical fiber
JPS6131324A (en) Production of base material for optical fiber
JPH0820574B2 (en) Dispersion shift fiber and manufacturing method thereof
JPH085685B2 (en) Method for manufacturing base material for dispersion-shifted optical fiber
JPH0210095B2 (en)
JP3343079B2 (en) Optical fiber core member, optical fiber preform, and method of manufacturing the same
JPH0463365B2 (en)
JPS59141438A (en) Manufacture of optical fiber preform
EP0415341B1 (en) Method for producing porous glass preform for optical fiber
JPH0798671B2 (en) Method for manufacturing preform for optical fiber
JPH0460930B2 (en)
JPS6127721B2 (en)
EP0185975A1 (en) Process for fabricating a glass preform
JPS593944B2 (en) Optical fiber manufacturing method
JPS59137333A (en) Manufacture of base material for optical fiber
Schultz Vapor phase materials and processes for glass optical waveguides
JPS6140843A (en) Optical fiber
JPS6220140B2 (en)
JPH06219765A (en) Production of preform for optical fiber