JPH0146459B2 - - Google Patents
Info
- Publication number
- JPH0146459B2 JPH0146459B2 JP5433281A JP5433281A JPH0146459B2 JP H0146459 B2 JPH0146459 B2 JP H0146459B2 JP 5433281 A JP5433281 A JP 5433281A JP 5433281 A JP5433281 A JP 5433281A JP H0146459 B2 JPH0146459 B2 JP H0146459B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- core
- particles
- cladding
- 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.)
- Expired
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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
- C03B19/102—Forming solid beads by blowing a gas onto a stream of molten glass or onto particulate materials, e.g. pulverising
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
- C03B19/106—Forming solid beads by chemical vapour deposition; by liquid phase reaction
-
- 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
- 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]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/06—Glass compositions containing silica with more than 90% silica by weight, e.g. quartz
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/24—Single mode [SM or monomode]
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/26—Parabolic or graded index [GRIN] core profile
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/04—Multi-nested ports
- C03B2207/06—Concentric circular ports
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
- C03B2207/26—Multiple ports for glass precursor
- C03B2207/28—Multiple ports for glass precursor for different glass precursors, reactants or modifiers
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/60—Relationship between burner and deposit, e.g. position
- C03B2207/64—Angle
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2201/00—Glass compositions
- C03C2201/06—Doped silica-based glasses
- C03C2201/30—Doped silica-based glasses containing metals
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2201/00—Glass compositions
- C03C2201/06—Doped silica-based glasses
- C03C2201/30—Doped silica-based glasses containing metals
- C03C2201/40—Doped silica-based glasses containing metals containing transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2203/00—Production processes
- C03C2203/40—Gas-phase processes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- General Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
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も
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an optical fiber preform.
GeO2、SnO2、PbO2、P2O5等のドーパント材
の一種以上を固溶せしめて添加（即ち、Si―Ｏ―
GeのようにSiO2とドーパント材とを結合せしめ
て添加）したガラス微粒子（または水晶粉）より
光フアイバ母材を製造するには、従来、第１図〜
第２図にその概略断面図を示す装置を用いて製造
していた。ただし、図中１，２１，３１はガラス
微粒子（または水晶粉）、２，２２，３２は合成
トーチ、３はガラス微粒子流、４はガラス微粒子
流３の吹き出し方向を示す矢印、５は火炎または
プラズマ炎、６はドーブトガラス体、７，２７，
３７は出発材、８，２８，３８は回転軸、２３，
３３は前記ガラス微粒子２１，３１と異なる組成
のガラス微粒子、２４，３４はクラツド用トー
チ、２５，３５はコアガラス体、２６，３６はク
ラツドガラス体を示す。 Addition of one or more dopant materials such as GeO 2 , SnO 2 , PbO 2 , P 2 O 5 etc. as a solid solution (i.e. Si-O-
Conventionally, in order to manufacture an optical fiber base material from glass fine particles (or crystal powder) containing SiO 2 and a dopant material (such as Ge), the steps shown in Figs.
It was manufactured using an apparatus whose schematic cross-sectional view is shown in FIG. However, in the figure, 1, 21, and 31 are glass particles (or crystal powder), 2, 22, and 32 are synthetic torches, 3 is a glass particle flow, 4 is an arrow indicating the blowing direction of the glass particle flow 3, and 5 is a flame or Plasma flame, 6 is doubt glass body, 7, 27,
37 is a starting material, 8, 28, 38 is a rotating shaft, 23,
Reference numeral 33 indicates glass particles having a composition different from those of the glass particles 21 and 31, 24 and 34 a cladding torch, 25 and 35 a core glass body, and 26 and 36 a cladding glass body.
第１図における装置により光フアイバ母材を製
造するには、ガラス微粒子１をトーチ２より酸素
及び水素（火炎を用いる場合）と共にガラス微粒
子流３として矢印４方向に吹き出させ、酸素及び
水素により形成した火炎（プラズマ炎でもよい）
５により出発材７先端に前記ガラス微粒子１を堆
積させ、溶融し、透明なドープトシリカガラス体
を形成せしめる。この場合、前記出発材７の回転
軸８は火炎またはプラズマ炎５中のガラス微粒子
流３の吹き出し方向４に対し、同一線上あるいは
平行であつた。 To manufacture an optical fiber base material using the apparatus shown in FIG. 1, glass particles 1 are blown out from a torch 2 together with oxygen and hydrogen (if flame is used) as a glass particle stream 3 in the direction of arrow 4, and the glass particles 1 are formed by the oxygen and hydrogen. flame (plasma flame may also be used)
5, the glass particles 1 are deposited on the tip of the starting material 7 and melted to form a transparent doped silica glass body. In this case, the rotation axis 8 of the starting material 7 was on the same line or parallel to the blowing direction 4 of the glass particle stream 3 in the flame or plasma flame 5.
このような方法によりドープトシリカガラス体
６を製造すると、ガラス体成長面の中心と周辺と
で溶融温度が大幅に異なるため得られるガラス体
の外径寸法の変動が大きくなり、光フアイバ母材
として用いるには外周を研磨する必要があつた。 When the doped silica glass body 6 is manufactured by such a method, the melting temperature differs significantly between the center and the periphery of the glass body growth surface, resulting in large fluctuations in the outer diameter of the resulting glass body, and the optical fiber base material It was necessary to polish the outer periphery in order to use it.
また、第２図及び第３図に示すように、コア用
合成トーチ２２，３２及びクラツド用トーチ２
４，３４を用い、前記コア用トーチ２２，３２よ
りコア用ガラス微粒子２１，３１を吹き出させ、
一方クラツド用トーチ２４，３４よりクラツド用
ガラス微粒子２３，３３を吹き出すことにより、
コアガラス体２５，３５の周囲にクラツドガラス
体２６，３６を形成せしめたガラス体を出発材２
７，３７上に製造する方法もある。 In addition, as shown in FIGS. 2 and 3, the core synthesis torches 22 and 32 and the cladding torch 2
4, 34 to blow out the core glass fine particles 21, 31 from the core torches 22, 32,
On the other hand, by blowing out glass fine particles 23, 33 for cladding from torches 24, 34 for cladding,
A starting material 2 is a glass body in which clad glass bodies 26 and 36 are formed around core glass bodies 25 and 35.
There is also a method of manufacturing on 7,37.
しかしながら、この方法によれば、コアガラス
体２５とクラツドガラス体２６の境界面が不均一
となり、実用的な光フアイバ母材を得るのが極め
て困難であるという欠点がある。 However, this method has the disadvantage that the interface between the core glass body 25 and the clad glass body 26 becomes non-uniform, making it extremely difficult to obtain a practical optical fiber base material.
本発明はこのような欠点のない光フアイバ母材
の製造方法を提供せんとするものである。詳しく
は、外径寸法が均一で、かつコアとクラツドを２
以上のトーチを用いて同時に合成するに際して
は、コア及びクラツドの境界面が均一な光フアイ
バ母材が製造しえる方法を提供することを目的と
する。 The present invention aims to provide a method for manufacturing an optical fiber preform without such drawbacks. Specifically, the outer diameter is uniform and the core and cladding are two
It is an object of the present invention to provide a method that can produce an optical fiber base material having a uniform interface between the core and the cladding when simultaneously synthesizing the fibers using the above-mentioned torch.
したがつて、本発明による光フアイバ母材の製
造方法は、クラツド用のSiO2と固溶せしめてド
ーパントを添加したガラス微粒子または水晶粉お
よびコア用のSiO2と固溶せしめてドーパントを
添加したガラス微粒子または水晶粉とを、それぞ
れクラツド用ガラス微粒子流吹き出し口およびコ
アガラス微粒子吹き出し口より吹き出すと共に、
火炎またはプラズマ炎によつて、回転しながら移
動する出発材の先端に堆積、溶融するに際し、該
クラツド用ガラス微粒子流吹き出し口とコア用ガ
ラス微粒子流吹き出し口をガラスの堆積方向に対
しコア用ガラス微粒子流吹き出し口が先になるよ
うに並べて配置するとともに、該火炎またはプラ
ズマ炎中のガラス微粒子流の二つの吹き出し口を
該出発材の回転軸に対し、5゜〜90゜傾斜せしめる
ことを特徴とするものである。 Therefore, the method for producing an optical fiber base material according to the present invention includes glass fine particles or crystal powder to which a dopant is added by solid solution with SiO 2 for the cladding, and dopant added by solid solution with SiO 2 for the core. While blowing out glass fine particles or crystal powder from the glass fine particle flow outlet for the cladding and the core glass fine particle outlet, respectively,
When the starting material is deposited and melted by a flame or plasma flame at the tip of the rotating starting material, the core glass is connected to the glass fine particle flow outlet for the cladding and the glass fine particle flow outlet for the core in the direction of glass deposition. They are arranged side by side so that the particulate stream outlet comes first, and the two outlets for the glass particulate stream in the flame or plasma flame are tilted at an angle of 5° to 90° with respect to the rotation axis of the starting material. That is.
本発明を更に詳しく説明する。 The present invention will be explained in more detail.
本発明による光フアイバ母材の製造方法によれ
ば、ガラス微粒子または水晶粉を火炎ないしプラ
ズマ炎と共に吹きつけて、出発材先端に堆積さ
せ、溶融するに際し、従来と異なり、ガラス微粒
子の吹き出し方向に対し、出発材の回転軸を5゜〜
90゜傾斜させる。後述の記載で示されるようにこ
の範囲の角度を持たせることによりガラス成長面
上の溶融温度は中心部と周辺部でほぼ同一とな
り、得られるガラス体４６の外径寸法精度は著し
く向上する。特に好ましくは30゜〜70℃である。 According to the method for producing an optical fiber base material according to the present invention, glass fine particles or crystal powder are blown together with flame or plasma flame, deposited on the tip of the starting material, and melted. On the other hand, the rotation axis of the starting material should be rotated by 5°~
Tilt it 90 degrees. As shown in the description below, by providing an angle within this range, the melting temperature on the glass growth surface will be approximately the same in the center and the periphery, and the dimensional accuracy of the outer diameter of the resulting glass body 46 will be significantly improved. Particularly preferred temperature is 30° to 70°C.
第４図は本発明による光フアイバ母材の製造方
法における傾斜角を決定するための実験に用いた
装置の概略図であり、図中、４１はガラス微粒子
または水晶粉、４２はトーチ、４３はガラス微粒
子流、４４はガラス微粒子吹き出し方向を示す矢
印、４５は火炎またはプラズマ炎、４６はドープ
トガラス体、４７は出発材、４８は回転軸を示
す。 FIG. 4 is a schematic diagram of the apparatus used in the experiment for determining the inclination angle in the method for manufacturing an optical fiber base material according to the present invention. In the figure, 41 is glass fine particles or crystal powder, 42 is a torch, and 43 is a A flow of glass particles, 44 an arrow indicating the blowing direction of glass particles, 45 a flame or plasma flame, 46 a doped glass body, 47 a starting material, and 48 a rotation axis.
第４図より明らかなように、GeO2、SnO2、
PbO2、P2O5等のドーパント材をSiO2と固溶添加
せしめたガラス微粒子または水晶粉４１はトーチ
４２に供給され、ガラス微粒子流４３として、矢
印４４方向に火炎またはプラズマ炎４５中に吹き
出される。このようにして吹き出されたガラス微
粒子流４３は出発材４７先端に堆積、溶融し、丸
棒状透明ドープトシリカガラス体４６が製造され
る。 As is clear from Fig. 4, GeO 2 , SnO 2 ,
Glass particles or crystal powder 41 to which a dopant material such as PbO 2 or P 2 O 5 is added as a solid solution with SiO 2 is supplied to a torch 42 and flows as a glass particle stream 43 into a flame or plasma flame 45 in the direction of an arrow 44. It's blown out. The glass particle stream 43 blown out in this manner is deposited on the tip of the starting material 47 and melted, producing a round rod-shaped transparent doped silica glass body 46.
この際、出発材４７の回転軸４８とガラス微粒
子４３の吹き出し方向４４との角度θは５〜90゜
とする。このように角度θを持たせることによ
り、ガラス体成長面４９上の溶融温度は中心部と
周辺部でほぼ同一となり、得られるガラス体４６
の外径寸法精度は著しく良好となる。 At this time, the angle θ between the rotating shaft 48 of the starting material 47 and the blowing direction 44 of the glass particles 43 is set to 5 to 90°. By setting the angle θ in this way, the melting temperature on the glass body growth surface 49 becomes almost the same in the center and the peripheral area, and the resulting glass body 46
The dimensional accuracy of the outer diameter is significantly improved.
第５図はこの傾斜角θをパラメータとしてガラ
ス体４６の外径変動（％）の変化を測定した結果
を示すグラフである。この外径変動は下記の(1)式
で示される概念である。 FIG. 5 is a graph showing the results of measuring changes in the outer diameter variation (%) of the glass body 46 using this inclination angle θ as a parameter. This outer diameter variation is a concept expressed by the following equation (1).
外径変動(%)＝変動巾(mm)／平均外径(mm)
×100 …(1)
この第５図より明らかなように、傾斜角θが５
〜90゜の範囲にあつては、外径変動は10％以下で
あり、30〜70゜の範囲では２％（±１％）以下と
極めて良好な結果を得た。さらに、同時にガラス
体４６の成長速度も改良され、傾斜角θが30〜
70゜の範囲では傾斜角θが0゜の場合に較べて約５
倍となつた。Outer diameter variation (%) = variation width (mm) / average outer diameter (mm) × 100...(1) As is clear from this figure 5, when the inclination angle θ is 5
In the range of ~90°, the outer diameter variation was less than 10%, and in the range of 30 to 70°, it was less than 2% (±1%), giving very good results. Furthermore, at the same time, the growth rate of the glass body 46 is improved, and the inclination angle θ is 30~30.
In the range of 70°, the angle of inclination θ is about 5 compared to 0°.
It has doubled.
実施例 １
第６図は本発明でコア用ガラス微粒子流吹き出
し口をクラツド用のそれより先になるように並べ
て配置することを模式的に説明するための概略図
であり、図中、６１はガラス微粒子、６２はコア
用トーチ、６３はガラス微粒子６１とは組成の異
なるガラス微粒子、６４はクラツド用トーチ、６
５はガラス微粒子吹出し方向の矢印、６６はコア
ガラス体、６７はクラツドガラス体６８は出発
材、６９は出発材６９の回転軸を示す。Embodiment 1 FIG. 6 is a schematic diagram for schematically illustrating that the glass particle flow outlet for the core is arranged side by side before that for the cladding in the present invention, and in the figure, 61 is a Glass fine particles, 62 a core torch, 63 glass fine particles having a different composition from the glass fine particles 61, 64 a cladding torch, 6
Reference numeral 5 indicates an arrow in the direction of blowing out glass particles, 66 indicates a core glass body, 67 indicates a clad glass body 68 as a starting material, and 69 indicates a rotation axis of the starting material 69.
ドーパントを固溶添加したガラス微粒子６１を
コア用トーチ６２に供給し、コアガラス体６６を
作製し、さらに前記ガラス微粒子６１とは組成の
異なるガラス微粒子６３をクラツド用トーチ６４
に供給して、該ガラス体６６の側面にクラツドガ
ラス体６７を合成し、外径寸法の均一な光フアイ
バ用母材を得た。 Glass particles 61 to which a dopant has been added as a solid solution are supplied to a core torch 62 to produce a core glass body 66, and glass particles 63 having a composition different from that of the glass particles 61 are supplied to a cladding torch 64.
A clad glass body 67 was synthesized on the side surface of the glass body 66 to obtain an optical fiber base material having a uniform outer diameter.
ガラス微粒子流の吹き出し方向６５に対する出
発材６８の回転軸６９の傾斜角θは50゜であつた。
またトーチ６２にGeO2を10モル％固溶添加した
ガラス微粒子６１を毎分10ｇ、またトーチ６４に
SiO2のみのガラス微粒子６３を毎分63ｇそれぞ
れ供給した。このようにしてコアガラス体６６の
直径40mm、クラツドガラス体６６の外径100mmの
光フアイバ母材が毎分70ｇの割合で得られた。ま
た軸方向の成長速度は毎分約3.6mmであり外径変
動は±１％以下であつた。 The angle of inclination θ of the rotating shaft 69 of the starting material 68 with respect to the blowing direction 65 of the glass particle flow was 50°.
In addition, glass fine particles 61 containing 10 mol% of GeO 2 as a solid solution were added to the torch 62 at 10 g per minute, and to the torch 64.
Glass particles 63 containing only SiO 2 were supplied in an amount of 63 g per minute. In this way, an optical fiber base material having a core glass body 66 of 40 mm in diameter and a clad glass body 66 of 100 mm in outer diameter was obtained at a rate of 70 g/min. The growth rate in the axial direction was approximately 3.6 mm per minute, and the variation in outer diameter was less than ±1%.
第７図は、この実施例によつて得られた光フア
イバ母材中の屈折率分布を示したものである。n1
は1.4756、n2は1.458（石英ガラスの屈折率）であ
り、比屈折率差△ｎ〔＝n1−n2／n2×100〕は約１％
であつた。また、コアガラス体中の屈折率ゆらぎ
は極めて小さいほか、クラツドガラス体中の屈折
率も均一であり、いわゆる屈折率の“すそひき”
はみられず良好なステツプ型屈折率分布であつ
た。 FIG. 7 shows the refractive index distribution in the optical fiber base material obtained in this example. n 1
was 1.4756, n 2 was 1.458 (refractive index of silica glass), and the relative refractive index difference Δn [=n 1 −n 2 /n 2 ×100] was about 1%. In addition, the fluctuation in the refractive index in the core glass body is extremely small, and the refractive index in the clad glass body is also uniform, resulting in the so-called ``skipping'' of the refractive index.
A good step-type refractive index distribution was observed.
実施例 ２
第８図は本発明による光フアイバ母材の製造方
法を示す実施例３を模式的に示す概略図であり、
図中８１はコア用トーチ、８２はクラツド用トー
チ、８３は細径コアガラス体、８４は肉厚クラツ
ドガラス体を示す。Example 2 FIG. 8 is a schematic diagram schematically showing Example 3 showing the method for manufacturing an optical fiber base material according to the present invention,
In the figure, 81 is a core torch, 82 is a cladding torch, 83 is a small-diameter core glass body, and 84 is a thick cladding glass body.
この第８図より明らかなように、コア用トーチ
８１によつて比較的細径なコアガラス体８３（△
ｎ＝0.2〜１）を作製し、この側面に大型のクラ
ツド用トーチ８２によつて、厚いクラツドガラス
体８４（コア直径の15〜20倍）を合成した。これ
により単一モードフアイバ用の透明母材が得られ
る。この場合、第７図に示したようにVAD法で
若干みられるクラツド部での“すそひき”がない
ほか、MCVD法でみられる中心部のデツプもな
く、単一モード用としては理想的な屈折率分布と
なつた。 As is clear from FIG. 8, the core glass body 83 (△
A thick cladding glass body 84 (15 to 20 times the core diameter) was synthesized on the side surface using a large cladding torch 82. This provides a transparent matrix for single mode fibers. In this case, as shown in Fig. 7, there is no "heeling" in the cladding part that is seen in the VAD method, and there is also no depth in the center seen in the MCVD method, making it ideal for single mode use. It became a refractive index distribution.
さらに、上記実施例においてプラズマ炎等、
OH基の混入を防止できる熱源を用いてガラス微
粒子を堆積、溶融すれば、無水の光フアイバ母材
が得られ、光伝送損失を極めて低減化できた。 Furthermore, in the above embodiments, plasma flame etc.
By depositing and melting glass particles using a heat source that prevents the incorporation of OH groups, an anhydrous optical fiber base material can be obtained, and optical transmission loss can be significantly reduced.
以上説明したように、本発明によつて、外径寸
法およびコアークラツド境界面の均一な光フアイ
バ母材が、高合成速度で得られるから、実用的に
使用できる光フアイバの価格を低下できる利点が
ある。また、屈折率分布が理想的で伝送特性の優
れた単一モードフアイバ母材を大量に製造できる
と言う利点もある。 As explained above, according to the present invention, an optical fiber base material having a uniform outer diameter and a uniform core-clad interface can be obtained at a high synthesis rate, which has the advantage of reducing the price of optical fibers that can be used for practical purposes. be. Another advantage is that a single mode fiber base material with an ideal refractive index distribution and excellent transmission characteristics can be manufactured in large quantities.
第１図〜第３図は従来の光フアイバ母材の製造
方法を説明するための概略図、第４図は本発明に
よる光フアイバ母材の製造方法における傾斜角を
決定するための実験に用いた装置の概略図、第５
図は実施例１によつて得られた光フアイバ母材の
傾斜角θに対する外径変動の変化を示すグラフ、
第６図は本発明の実施例２を説明するための概略
図、第７図は実施例２によつて得られた光フアイ
バ母材の屈折率分布を示すグラフ、第８図は実施
例３を説明するための概略図である。
１…ガラス微粒子（または水晶粉）、２…トー
チ、３…ガラス微粒子（または水晶粉）流、４…
該ガラス微粒子の吹き出し方向、５…火炎または
プラズマ炎、６…透明なドープトシリカガラス
体、７…出発材、８…出発材の回転軸、２１，３
１…ガラス微粒子、２２，３２…コア用トーチ、
２３，３３…ガラス微粒子２１，３１とは組成の
異なるガラス微粒子、２４，３４…クラツド用ト
ーチ、２５，３５…コアガラス体、２６，３６…
クラツドガラス体、２７…出発材、２８…回転
軸、４１…ガラス微粒子（又は水晶粉）、４２…
トーチ、４３…ガラス微粒子流、４４…ガラス微
粒子の吹出し方向矢印、４５…火炎またはプラズ
マ炎、４６…丸棒状透明ドープトシリカガラス
体、４７…出発材、４８…出発材の回転軸、４９
…ガラス体成長面、６１…ガラス微粒子、６２…
コア用トーチ、６３…６１とは組成の異なるガラ
ス微粒子、６４…クラツド用トーチ、６５…ガラ
ス微粒子流の吹き出し方向、６６…コアガラス
体、６７…クラツドガラス体、６８…出発材、６
９…出発材の回転軸、８１…コア用トーチ、８２
…クラツド用トーチ、８３…細径コアガラス体、
８４…肉厚クラツドガラス体。
1 to 3 are schematic diagrams for explaining the conventional method for manufacturing an optical fiber preform, and FIG. 4 is used for an experiment to determine the inclination angle in the method for manufacturing an optical fiber preform according to the present invention. Schematic diagram of the device used, No. 5
The figure is a graph showing the change in outer diameter variation with respect to the inclination angle θ of the optical fiber base material obtained in Example 1,
FIG. 6 is a schematic diagram for explaining Example 2 of the present invention, FIG. 7 is a graph showing the refractive index distribution of the optical fiber base material obtained in Example 2, and FIG. 8 is Example 3. It is a schematic diagram for explaining. 1...Glass particles (or crystal powder), 2...Torch, 3...Glass particles (or crystal powder) flow, 4...
Blowing direction of the glass particles, 5... Flame or plasma flame, 6... Transparent doped silica glass body, 7... Starting material, 8... Rotation axis of starting material, 21, 3
1... Glass fine particles, 22, 32... Core torch,
23, 33... Glass particles having a different composition from the glass particles 21, 31, 24, 34... Torch for cladding, 25, 35... Core glass body, 26, 36...
Clad glass body, 27... Starting material, 28... Rotating shaft, 41... Glass fine particles (or crystal powder), 42...
Torch, 43...Glass particle flow, 44...Blowing direction arrow of glass particles, 45...Flame or plasma flame, 46...Round bar-shaped transparent doped silica glass body, 47...Starting material, 48...Rotation shaft of starting material, 49
...Glass growth surface, 61...Glass fine particles, 62...
Torch for core, 63...Glass particles having a different composition from 61, 64...Torch for cladding, 65...Blowing direction of glass particle flow, 66... Core glass body, 67... Clad glass body, 68... Starting material, 6
9... Rotating shaft of starting material, 81... Torch for core, 82
...Torch for cladding, 83...Small core glass body,
84...Thick clad glass body.
Claims (1)
トを添加したガラス微粒子または水晶粉およびコ
ア用のSiO2と固溶せしめてドーパントを添加し
たガラス微粒子または水晶粉とを、それぞれクラ
ツド用ガラス微粒子流吹き出し口およびコアガラ
ス微粒子吹き出し口より吹き出すと共に、火炎ま
たはプラズマ炎によつて、回転しながら移動する
出発材の先端に堆積、溶融して透明ガラス体を形
成するに際し、該クラツド用ガラス微粒子流吹き
出し口とコア用ガラス微粒子流吹き出し口をガラ
スの堆積方向に対しコア用ガラス微粒子流吹き出
し口が先になるように並べて配置するとともに、
該火炎またはプラズマ炎中のガラス微粒子流の二
つの吹き出し口を該出発材の回転軸に対し、5゜〜
90゜傾斜せしめることを特徴とする光フアイバ母
材の製造方法。1 Glass fine particles or crystal powder to which a dopant has been added in a solid solution with SiO 2 for the cladding and glass fine particles or quartz powder to which a dopant has been added by solid solution with SiO 2 for the core are each blown out as glass fine particle flow for the cladding. The glass particles are blown out from the mouth and the core glass particles are deposited and melted on the tip of the rotating starting material by flame or plasma flame to form a transparent glass body. and the core glass particle flow outlet are arranged in such a way that the core glass particle flow outlet is located first with respect to the glass deposition direction, and
The two outlets for the glass particle flow in the flame or plasma flame are set at an angle of 5° to the rotation axis of the starting material.
A method for producing an optical fiber base material characterized by tilting it at 90°.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5433281A JPS57170832A (en) | 1981-04-13 | 1981-04-13 | Manufacture of base material for optical fiber |
| CA000384809A CA1188895A (en) | 1980-09-11 | 1981-08-28 | Fabrication methods of doped silica glass and optical fiber preform by using the doped silica glass |
| GB8126332A GB2083806B (en) | 1980-09-11 | 1981-08-28 | Fabrication methods of doped silica glass and optical fibre preform by using the doped silica glass |
| US06/300,296 US4414012A (en) | 1980-09-11 | 1981-09-08 | Fabrication methods of doped silica glass and optical fiber preform by using the doped silica glass |
| FR8117174A FR2489808B1 (en) | 1980-09-11 | 1981-09-10 | |
| IT8123880A IT1139603B (en) | 1980-09-11 | 1981-09-10 | Doped silica glass prodn. used for optical fibre preforms |
| NL8104196A NL190841C (en) | 1980-09-11 | 1981-09-10 | A method of manufacturing optical fiber preforms from doped quartz glass. |
| DE19813136429 DE3136429C2 (en) | 1980-09-16 | 1981-09-14 | Process for producing doped SiO↓2↓ glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5433281A JPS57170832A (en) | 1981-04-13 | 1981-04-13 | Manufacture of base material for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57170832A JPS57170832A (en) | 1982-10-21 |
| JPH0146459B2 true JPH0146459B2 (en) | 1989-10-09 |
Family
ID=12967635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5433281A Granted JPS57170832A (en) | 1980-09-11 | 1981-04-13 | Manufacture of base material for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57170832A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186240A (en) * | 1985-02-15 | 1986-08-19 | Sumitomo Electric Ind Ltd | Production of piled material of glass fine particles |
| JP4742429B2 (en) * | 2001-02-19 | 2011-08-10 | 住友電気工業株式会社 | Method for producing glass particulate deposit |
| JP5589744B2 (en) * | 2009-10-15 | 2014-09-17 | 旭硝子株式会社 | Manufacturing method of quartz glass base material |
-
1981
- 1981-04-13 JP JP5433281A patent/JPS57170832A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57170832A (en) | 1982-10-21 |
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