JPS60264338A - Manufacture of optical fiber preform - Google Patents

Manufacture of optical fiber preform

Info

Publication number
JPS60264338A
JPS60264338A JP11940084A JP11940084A JPS60264338A JP S60264338 A JPS60264338 A JP S60264338A JP 11940084 A JP11940084 A JP 11940084A JP 11940084 A JP11940084 A JP 11940084A JP S60264338 A JPS60264338 A JP S60264338A
Authority
JP
Japan
Prior art keywords
glass
rod
glass rod
optical fiber
glass layer
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
JP11940084A
Other languages
Japanese (ja)
Other versions
JPH0525818B2 (en
Inventor
Kazuaki Yoshida
和昭 吉田
Yasuro Furui
古井 康郎
Takeyuki Kikuchi
菊池 健之
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.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric 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 Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP11940084A priority Critical patent/JPS60264338A/en
Publication of JPS60264338A publication Critical patent/JPS60264338A/en
Publication of JPH0525818B2 publication Critical patent/JPH0525818B2/ja
Granted legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/01413Reactant delivery systems
    • C03B37/0142Reactant deposition burners
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/0148Means for heating preforms during or immediately prior to deposition
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00Glass deposition burners
    • C03B2207/36Fuel or oxidant details, e.g. flow rate, flow rate ratio, fuel additives
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00Glass deposition burners
    • C03B2207/50Multiple burner arrangements
    • C03B2207/54Multiple burner arrangements combined with means for heating the deposit, e.g. non-deposition burner

Abstract

PURPOSE:To obtain an optical fiber preform having excellent characteristics, preventing the formation of bubbles at the glass interface and the intrusion of moisture into the preform, by preheating a glass rod with a flame containing chlorine or its compound, and depositing a glass layer to the circumference. CONSTITUTION:The glass rod 6 ascending slowly under rotation is preheated at a high temperature by a flame containing chlorine (compound) which does not form a glass raw material, e.g. SOCl2, etc. using a preheating burner 3. Glass soot formed by the vapor-phase reaction, i.e. flame hydrolysis reaction by the glass-forming burners 4, 5 is deposited to the outer circumference of the preheated glass rod 6 to form a porous glass layer 7. Since the glass rod 6 is preheated, the glass soot can be deposited firmly to the rod. Thereafter, the glass layer 7 is converted to a transparent glass layer by the thermal treatment in an electrical furnace (1,400 deg.C) in a mixed atmosphere consisting of e.g. H and a small amount of SOCl2.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はガラス棒を増径加工して光フアイバ母材を製造
する方法に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an optical fiber base material by increasing the diameter of a glass rod.

(従来の技術) 既知の通り、シングルモード型の光ファイバではそのコ
ア、クラッドとも高純度であることが望まれており、特
にOH基含有量の少ないことが望まれている。
(Prior Art) As is known, in a single-mode optical fiber, both the core and cladding are desired to have high purity, and in particular, it is desired that the content of OH groups be low.

上記光フアイバ母材を製造するとき、はじめコア直径/
クラッド直径が1/3〜1/6となるよう、コア用ガラ
スとクラッド用ガラスとからなる高純度ガラス棒をつく
り、その後、該ガラス棒の外周に多孔質ガラス層(クラ
ッド用)を堆積形成してこれを脱水ならびに透明ガラス
化するといった手段が採られており、この際の増径加工
により、上記直径比を178〜1/12あるいはそれ以
下となるようにしている。
When manufacturing the above optical fiber base material, initially the core diameter/
A high-purity glass rod is made of core glass and cladding glass so that the cladding diameter is 1/3 to 1/6, and then a porous glass layer (for cladding) is deposited around the outer periphery of the glass rod. This is then dehydrated and made into transparent glass, and the diameter ratio is increased to 178 to 1/12 or less.

ところで上記増径加工の際、ガラス棒とその外周に形成
されたガラス層との界面に気泡を発生することがよくあ
り、これを解消するため、多孔質ガラス層の堆積前、ガ
ラス棒を予熱するといった提案がすでになされている。
By the way, during the above diameter increasing process, bubbles are often generated at the interface between the glass rod and the glass layer formed on its outer periphery.To eliminate this, the glass rod is preheated before depositing the porous glass layer. Proposals have already been made to do so.

この提案の場合、ガラス棒が予熱されているため同体に
対する多孔質ガラスの刺着具合がよくなリ、気泡の発生
がほとんどないが、その反面、予熱用バーナを介して加
熱されることによりガラス棒の表面から水分が侵入し、
これが原因で伝送損失が高くなるといった問題を新たに
惹き起こしている。
In the case of this proposal, since the glass rod is preheated, the porous glass adheres well to the rod, and there is almost no generation of bubbles. Moisture enters from the surface of the rod,
This has caused new problems such as increased transmission loss.

(発明が解決しようとする問題点) 本発明は上記ガラス界面での気泡の発生を阻止するだけ
でなく、水分の侵入をも阻止して特性のよい光フアイバ
母材を製造しようとするものである。
(Problems to be Solved by the Invention) The present invention aims to manufacture an optical fiber base material with good characteristics by not only preventing the generation of bubbles at the glass interface but also preventing moisture from entering. be.

(問題を解決するための手段) 本発明は、ガラス棒の外周にガラス層を堆積形成する光
フアイバ母材の製造方法において、ガラス原料にはなら
ない塩素または塩素化合物を含んだ火炎により上記ガラ
ス棒を予熱し、その後、ガラス棒の外周にガラス層を堆
積形成することを特徴としている。
(Means for Solving the Problem) The present invention provides a method for producing an optical fiber base material in which a glass layer is deposited on the outer periphery of a glass rod. It is characterized by preheating the glass rod, and then depositing and forming a glass layer around the outer periphery of the glass rod.

fl’ (作用) 本発明方法の場合、ガラス棒を予熱してからこれの外周
にガラス層を堆積形成するので、当該予熱によりガラス
棒に対するガラス層の付着具合が改善され、しかもこの
際の火炎が塩素または塩素化合物を含んでいるので、ガ
ラス中への水分の侵入が阻止されるとともにガラス棒表
面の不純物が揮散されると推定される。
fl' (Function) In the method of the present invention, since the glass layer is deposited on the outer periphery of the glass rod after preheating, the adhesion of the glass layer to the glass rod is improved by the preheating, and the flame at this time is contains chlorine or chlorine compounds, it is presumed that moisture is prevented from entering the glass and impurities on the surface of the glass rod are volatilized.

(実 施 例) 以下、本発明方法の実施例につき、図面を参照して説明
する。
(Example) Examples of the method of the present invention will be described below with reference to the drawings.

本発明方法の1実施例では、第1図のごとく、排気系l
を備なえた反応容器2内に多重管構造とした複数本のバ
ーナ3.4.5を挿設し、これら各z<−す3.4.5
を介してガラス棒6の外周に所定のガラス層を形成する
In one embodiment of the method of the invention, as shown in FIG.
A plurality of burners 3.4.5 having a multi-tube structure are inserted into a reaction vessel 2 equipped with a
A predetermined glass layer is formed on the outer periphery of the glass rod 6 via the glass rod 6.

ト記各バーナ3,4.5につき、第2図をも参照して詳
述すると、これら各バーナ3,4.5は四重管構造とな
っており、その中心の流路を第1流路a(内径4鵬謬φ
)として順次外周に第2流路b、第3流路C1第4流路
d(内径1?+w+*φ)を備なえている。
Each burner 3, 4.5 will be described in detail with reference to FIG. Road a (inner diameter 4 φ
), a second flow path b, a third flow path C, and a fourth flow path d (inner diameter 1?+w+*φ) are sequentially provided on the outer periphery.

このうちバーナ3は予熱用、バーナ4.5はガラス生成
用とするのであり、予熱用のバーナ3は反応容器2内の
下段、ガラス生成用のバーナ4.5はその」二段にそれ
ぞれ配置するが、ガラス棒に対するこれら各バーナ3.
4.5の噴射角θl、02、θ3はθ1=θ2=03=
70’とし、さラニ各バーナ3.4.5の先端からガラ
ス棒6軸心までの距#見1.fL2.見3はそれぞれf
Ll<文2く見3の状態において4.0cm 、 5.
0cm 、 7.0cmとする。
Of these, burner 3 is used for preheating, and burner 4.5 is used for glass production.The burner 3 for preheating is placed in the lower stage of the reaction vessel 2, and the burner 4.5 for glass production is placed in the second stage. However, each of these burners 3.
The injection angles θl, 02, θ3 of 4.5 are θ1=θ2=03=
70', and the distance from the tip of each burner 3.4.5 to the 6th axis of the glass rod is 1. fL2. See 3 is f respectively
Ll<4.0cm in the condition of sentence 2 and look 3, 5.
0cm and 7.0cm.

一方、ガラス棒6はコア用ガラスのみからなるものも採
用できるが、以下に述べる実施例では、GeO2−8i
02(Δ=0.3%)からなるコア用ガラスとS + 
02からなるクラッド用ガラスとを有するクラッド直径
/コア直径−4のガラス棒8を用いることとし、これの
外周にガラス層を堆積させる前、同体6を別工程での加
熱延伸により15mmφに減径しである。
On the other hand, the glass rod 6 can also be made of core glass, but in the embodiment described below, GeO2-8i
02 (Δ=0.3%) and S +
A glass rod 8 having a clad diameter/core diameter of -4 is used, and before depositing a glass layer on the outer periphery of the rod 8, the rod 6 is heated and stretched in a separate process to reduce its diameter to 15 mmφ. It is.

この加熱延伸後、ガラス棒6の外周面はHFによるエツ
チングにより削られており、したがってその外周の高O
H基含有部は除かれている。
After this heating and stretching, the outer circumferential surface of the glass rod 6 is etched by HF, so that the outer circumference has a high O.
H group-containing parts are excluded.

反応容器2内では各バーナ3,4.5を介してガラス棒
6の外周にガラス層を堆積させるが、このとき各バーナ
3,4.5へ供給する原料、ガスなどは次表の通りであ
る。
Inside the reaction vessel 2, a glass layer is deposited on the outer periphery of the glass rod 6 via each burner 3, 4.5. At this time, the raw materials, gas, etc. supplied to each burner 3, 4.5 are as shown in the table below. be.

なお、上記において第1流路aへS + Cl 4を供
給するときのキャリアガスはArとし、バーナ4へ原料
を供給するバプラの温度は千40℃、バーナ5へ原料を
供給するバブラの温度は+42℃とする。
In addition, in the above, the carrier gas when supplying S + Cl 4 to the first flow path a is Ar, the temperature of the bubbler that supplies the raw material to the burner 4 is 1,400 degrees Celsius, and the temperature of the bubbler that supplies the raw material to the burner 5 is is +42℃.

バーナ4.5については、必要に応じ、その一方、両方
を使用する。
As for burner 4.5, one or both of them may be used as required.

反応容器2内はその排気圧を−8,軸■H20として排
気し、この状態でガラス棒8を回転状態としてこれを7
0IIII/時の引上速度で引き上げる。
The inside of the reaction vessel 2 is evacuated with an exhaust pressure of -8 and an axis of H20, and in this state, the glass rod 8 is rotated and then the
It is pulled up at a pulling speed of 0 III/hour.

本発明方法では1例として上記のような条件下でガラス
棒6の外周にガラス層を堆積させるのであり、以下これ
につき説明すると、回転状態′T緩速上昇するガラス棒
6は、燃焼状態にある予熱用バーナ3を介して高温予熱
され、その後、該ガラス棒6の外周にはガラス生成用バ
ーナ4.5による気相反応生成物、すなわち火炎加水分
解反応による煤状のガラスが堆積され、これにより多孔
質状のガラス層7が形成される。
In the method of the present invention, as an example, a glass layer is deposited on the outer periphery of the glass rod 6 under the above-mentioned conditions, and this will be explained below. The glass rod 6 is preheated to a high temperature via a preheating burner 3, and then a gas-phase reaction product from the glass-forming burner 4.5, that is, sooty glass resulting from a flame hydrolysis reaction, is deposited on the outer periphery of the glass rod 6. As a result, a porous glass layer 7 is formed.

1例としてガラス棒8の外周には60m+iφの上記ガ
ラス層7が形成されるが、このとき同体8はあらかじめ
加熱されているので上記煤状ガラスの付着具合がきわめ
て良好とる。
As an example, the glass layer 7 of 60 m+iφ is formed on the outer periphery of the glass rod 8. At this time, since the rod 8 is heated in advance, the adhesion of the soot-like glass is extremely good.

その後、上記ガラス層7はHeと少量の5OCI2とに
よる混合雰囲気の電気炉(1400℃)内で熱処理を受
け、直径35m1の透明ガラスとなる。
Thereafter, the glass layer 7 is heat treated in an electric furnace (1400° C.) in a mixed atmosphere of He and a small amount of 5OCI2, and becomes a transparent glass having a diameter of 35 m1.

以上により製造された母材につき、ガラス棒6と透明ガ
ラス化されたガラス層7との界面を観察したところ、こ
れには気泡の存在が全くみられなかった。
When the interface between the glass rod 6 and the transparent vitrified glass layer 7 was observed for the base material manufactured as described above, no air bubbles were observed therein.

上記母材が低OH基含有のものであるか否かを確認する
ため、シングルモード光ファイバとしてこれの伝送損失
を調べたところ、波長1.39gmにおける0■基の吸
収損失がほとんどなく、きわめて特性のよい低OH基含
有母材であることがわかった。
In order to confirm whether the above-mentioned base material contains a low OH group, we investigated the transmission loss of this as a single mode optical fiber, and found that there was almost no absorption loss of 0 groups at a wavelength of 1.39 gm. It was found to be a low OH group-containing base material with good properties.

上記と同じ条件において、ガラス棒8を予熱することな
くこれの外周に多孔質状のガラス層7を堆積させ、同層
7を透明ガラス化したところ、両者8.7の界面には予
測した通り、気泡が発生していた。
Under the same conditions as above, a porous glass layer 7 was deposited on the outer periphery of the glass rod 8 without preheating, and when the layer 7 was made into transparent glass, the interface between the two 8.7 was as expected. , bubbles were generated.

本発明方法の場合、シングルモード型以外にグレーテッ
ド型の光フアイバ母材も製造することができ、第3図(
シングルモード型)、第4図(グレーテッド型)は同法
により製造された各種母材の断面形状である。
In the case of the method of the present invention, a graded type optical fiber base material can be manufactured in addition to the single mode type, as shown in Fig. 3 (
(single mode type) and Fig. 4 (grated type) are cross-sectional shapes of various base materials manufactured by the same method.

これらの図において、8は(ieo2−9+02からな
るコア用ガラス、8.10はS + 02からなるクラ
ッド用ガラスであり、このうちコア用ガラス8とクラッ
ド用ガラス8とがガラス棒6に該当し、クラッド用ガラ
スlOがガラス層に該当する。
In these figures, 8 is the core glass made of (ieo2-9+02), 8.10 is the cladding glass made of S+02, and among these, the core glass 8 and the cladding glass 8 correspond to the glass rod 6. However, the cladding glass IO corresponds to the glass layer.

なお、上記ではガラス層7を形成するための原料をS 
+ CI 4としたが、同原料中にはGeCIaとか、
POCI 、BBraなどを少量混合してもよい。
In addition, in the above, the raw material for forming the glass layer 7 is S.
+ CI 4, but the same raw material contains GeCIa, etc.
A small amount of POCI, BBra, etc. may be mixed.

予熱用バーナ3の火炎(酸水素炎あるいは炭化水素炎な
ど)に含有させるのはガラス原料とならない塩素または
塩素化合物であり、これの1例として前記では5OC1
2を示したが、その他、CCI、、CCl2F2なども
あげることができる。
What is contained in the flame (oxyhydrogen flame, hydrocarbon flame, etc.) of the preheating burner 3 is chlorine or a chlorine compound that is not a raw material for glass.
2 is shown, but other examples include CCI, CCl2F2, etc.

この場合、H2(またはCH,)と02との比は)12
:02=0.6以下となるようにして低OH基化をはか
るのがよく、予熱温度としてはガラス微粒子堆積直前の
温度が800〜1000℃程度となるように設定するの
がよく、この範囲内であれば気泡の発生がよく阻止でき
、ガラス棒8の変形も防止できる。
In this case, the ratio of H2 (or CH,) and 02 is )12
:02=0.6 or less to achieve a low OH group, and the preheating temperature should be set so that the temperature immediately before glass particle deposition is about 800 to 1000°C, within this range. If inside, the generation of air bubbles can be effectively prevented and deformation of the glass rod 8 can also be prevented.

火炎中に01 を含有させるとき、そのCI2濃度をH
2に対して10容量!(11:I2による換算値)以上
とするのがよく、これにより低OH基化がより十分とな
る。
When 01 is contained in the flame, its CI2 concentration is
10 capacity for 2! (11: converted value based on I2) or more is preferable, and thereby the OH group can be more sufficiently reduced.

予熱用バーナ3は2本以上でもよく、ガラス生成用バー
ナ4.5もこれを1本に減らしたり、3本以上に増設し
てよく、こうした場合も各バーナの相対位置、噴射距離
などを適切に設定する。
The number of preheating burners 3 may be two or more, and the number of glass forming burners 4.5 may be reduced to one or increased to three or more. In such cases, the relative position of each burner, injection distance, etc. may be adjusted appropriately. Set to .

ガラス棒6の外周にガラス層7を形成するとき、該ガラ
ス層7を多孔賀状でなく透明ガラス化して堆積させるこ
ともでき、この場合は、例えばCVD法により生成され
た煤状ガラスを酸水素バーナやプラズマトーチなどによ
り高温加熱し、これによる透明ガラス化物をガラス棒8
の外周に堆積させる。
When forming the glass layer 7 on the outer periphery of the glass rod 6, the glass layer 7 can be deposited not in a perforated form but in a transparent vitrified form. Glass rod 8 is heated to a high temperature using a burner or plasma torch, and the resulting transparent vitrified material
Deposit on the outer periphery of the

上述した各種の堆積時、ガラス棒6は例えば上方などの
一方向へのみ移動させるほか、上下両方向へ往復動させ
るこぐもある。
During the various types of deposition described above, the glass rod 6 may be moved only in one direction, such as upward, or may be moved back and forth both up and down.

(発明の効果) 以上説明した通り、本発明方法によるときは塩素または
塩素化合物を含んだ火炎によりガラス棒を予熱してから
これの外周にガラス層を堆積形成するので、ガラス棒に
対するガラス層の付着具合が改善されるだけでなく、ガ
ラス中への水分の侵入も阻止されるようになり、したが
って当該方法により製造された母材からは気泡のない、
しかも0 0H基含有率の低い良性性の光ファイバが得られる。
(Effects of the Invention) As explained above, in the method of the present invention, the glass layer is deposited on the outer periphery of the glass rod after the glass rod is preheated with a flame containing chlorine or a chlorine compound. Not only is the adhesion improved, but the ingress of moisture into the glass is also prevented, and the matrix produced by this method is therefore bubble-free.
Moreover, a benign optical fiber with a low content of 0 0 H groups can be obtained.

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

第1図は本発明方法の1実施例を略示した説明図、第2
図はバーナの端面図、第3図、第4図は本発明方法によ
り製造された光フアイバ母材の断面図である。 2−・・・・反応容器 3 ・・・・争予熱用バーナ 4.5・e・ガラス生成用バーナ 6 ・・拳・・ガラス棒 7 ・・―・・ガラス層 8 ・・0番・コア用ガラス S、tO−−・クラッド用ガラス 代理人 弁理士 斎 藤 義 雄 +ll: 1 第1図
FIG. 1 is an explanatory diagram schematically showing one embodiment of the method of the present invention, and FIG.
The figure is an end view of the burner, and FIGS. 3 and 4 are cross-sectional views of the optical fiber preform manufactured by the method of the present invention. 2 - Reaction vessel 3 Burner for preheating 4.5 Burner for e-glass production 6 Fist Glass rod 7 Glass layer 8 No. 0 Core Glass for S, tO--・Glass agent for cladding Patent attorney Yoshio Saito +ll: 1 Figure 1

Claims (3)

【特許請求の範囲】[Claims] (1)ガラス棒の外周にガラス層を堆積形成する光フア
イバ母材の製造方法において、ガラス原料にはならない
塩素または塩素化合物を含んだ火炎により上記ガラス棒
を予熱し、その後、ガラス棒の外周にガラス層を堆積形
成することを特徴とする光フアイバ母材の製造方法。
(1) In a method for manufacturing an optical fiber base material in which a glass layer is deposited on the outer periphery of a glass rod, the glass rod is preheated with a flame containing chlorine or a chlorine compound that is not used as a glass raw material, and then the outer periphery of the glass rod is heated. A method for producing an optical fiber base material, comprising depositing and forming a glass layer on the base material.
(2)ガラス棒がコア用ガラスのみからなる特許請求の
範囲第1項記載の光フアイバ母材の製造方法。
(2) The method for manufacturing an optical fiber preform according to claim 1, wherein the glass rod is made of only core glass.
(3)ガラス棒がコア用ガラスとクラッド用ガラスとか
らなる特許請求の範囲第1項記載の光フアイバ母材の製
造方法。
(3) The method for manufacturing an optical fiber preform according to claim 1, wherein the glass rod comprises core glass and cladding glass.
JP11940084A 1984-06-11 1984-06-11 Manufacture of optical fiber preform Granted JPS60264338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11940084A JPS60264338A (en) 1984-06-11 1984-06-11 Manufacture of optical fiber preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11940084A JPS60264338A (en) 1984-06-11 1984-06-11 Manufacture of optical fiber preform

Publications (2)

Publication Number Publication Date
JPS60264338A true JPS60264338A (en) 1985-12-27
JPH0525818B2 JPH0525818B2 (en) 1993-04-14

Family

ID=14760554

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11940084A Granted JPS60264338A (en) 1984-06-11 1984-06-11 Manufacture of optical fiber preform

Country Status (1)

Country Link
JP (1) JPS60264338A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS627641A (en) * 1985-07-04 1987-01-14 Sumitomo Electric Ind Ltd Production of deposited body of fine glass particle
JPS62162646A (en) * 1986-01-10 1987-07-18 Sumitomo Electric Ind Ltd Production of glass fine particle deposit
JPS62297239A (en) * 1986-06-17 1987-12-24 Sumitomo Electric Ind Ltd Production of deposited glass soot
EP0629590A1 (en) * 1993-06-16 1994-12-21 Sumitomo Electric Industries, Limited Process for producing glass preform for optical fiber
WO2002090276A1 (en) * 2001-04-27 2002-11-14 Pirelli & C. S.P.A. Method for producing an optical fiber preform
JP2015098435A (en) * 2013-01-29 2015-05-28 古河電気工業株式会社 Optical fiber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654245A (en) * 1979-10-12 1981-05-14 Hitachi Ltd Preparation of low-oh optical fiber matrix
JPS5721497A (en) * 1980-07-12 1982-02-04 Ishikawajima Harima Heavy Ind Extraction device for separating and collecting fats from pieces of animal or like
JPS593944A (en) * 1982-06-29 1984-01-10 Fujitsu Ltd Wafer conveyer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654245A (en) * 1979-10-12 1981-05-14 Hitachi Ltd Preparation of low-oh optical fiber matrix
JPS5721497A (en) * 1980-07-12 1982-02-04 Ishikawajima Harima Heavy Ind Extraction device for separating and collecting fats from pieces of animal or like
JPS593944A (en) * 1982-06-29 1984-01-10 Fujitsu Ltd Wafer conveyer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS627641A (en) * 1985-07-04 1987-01-14 Sumitomo Electric Ind Ltd Production of deposited body of fine glass particle
JPS62162646A (en) * 1986-01-10 1987-07-18 Sumitomo Electric Ind Ltd Production of glass fine particle deposit
JPS62297239A (en) * 1986-06-17 1987-12-24 Sumitomo Electric Ind Ltd Production of deposited glass soot
EP0629590A1 (en) * 1993-06-16 1994-12-21 Sumitomo Electric Industries, Limited Process for producing glass preform for optical fiber
US5597398A (en) * 1993-06-16 1997-01-28 Sumitomo Electric Industries, Ltd. Process for producing glass preform for optical fiber
WO2002090276A1 (en) * 2001-04-27 2002-11-14 Pirelli & C. S.P.A. Method for producing an optical fiber preform
JP2015098435A (en) * 2013-01-29 2015-05-28 古河電気工業株式会社 Optical fiber

Also Published As

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