JPH05330843A - Production of optical fiber preform - Google Patents

Production of optical fiber preform

Info

Publication number
JPH05330843A
JPH05330843A JP16331992A JP16331992A JPH05330843A JP H05330843 A JPH05330843 A JP H05330843A JP 16331992 A JP16331992 A JP 16331992A JP 16331992 A JP16331992 A JP 16331992A JP H05330843 A JPH05330843 A JP H05330843A
Authority
JP
Japan
Prior art keywords
rod
burner
flame
optical fiber
fiber preform
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
JP16331992A
Other languages
Japanese (ja)
Inventor
Kohei Nishioka
耕平 西岡
Koichi Harada
光一 原田
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.)
Fujikura Ltd
Original Assignee
Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP16331992A priority Critical patent/JPH05330843A/en
Publication of JPH05330843A publication Critical patent/JPH05330843A/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
    • C03B2207/00—Glass deposition burners
    • C03B2207/60—Relationship between burner and deposit, e.g. position
    • C03B2207/64—Angle

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General 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)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To improve production efficiency by arranging a burner at a specified angle to the perpendicular to a rod to deposit soot on the rod. CONSTITUTION:A clad part is externally deposited on a starting material consisting of a quartz glass rod 1 and constituting at least a core part. In this case, a burner 2 is arranged at an angle alpha of <=50 deg. to the perpendicular to the rod 1. When the flame of the glass material such as SiCl4 is injected from the burner 2, the temp. distribution 3a of the flame over the rod 1 is widened as the flame is obliquely struck against the rod 1, and the SiO2 particles formed from the SiCl4 in the flame are deposited on the rod 1 at a higher rate than before. The coated rod is then sintered in the atmosphere of gaseous He, etc., and vitrified to obtain an optical fiber preform.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、光通信、エネルギー
伝送、直接画像伝送路として利用される光ファイバの母
材の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a base material of an optical fiber used as an optical communication, an energy transmission and a direct image transmission path.

【０００２】[0002]

【従来の技術】光ファイバは光ファイバ用母材を溶融線
引きして得られるが、この光ファイバ用母材の製造方法
に外付法がある。この方法は周知のように図３に示す如
く、少なくとも光ファイバのコアとなる部分を含む透明
な石英系ガラスロッドを出発部材としてこれを回転させ
ながら、その軸に沿って例えば複数の同心多重管バーナ
ーをトラバースさせて火炎加水分解反応によりその外周
に、光ファイバのクラッドとなるガラス微粉末（スー
ト）を堆積させて多孔質のスート層を形成し、次いで、
加熱炉内にてＨｅガス雰囲気中で焼成して透明なガラス
化された光ファイバ用母材とする方法であるが、その際
バーナー２はロッド１に対して直角に配置して行なって
いた。2. Description of the Related Art An optical fiber is obtained by melting and drawing an optical fiber preform, and there is an external method as a method for manufacturing this optical fiber preform. As is well known, this method uses a transparent silica glass rod including at least a portion to be a core of an optical fiber as a starting member and rotates this while rotating it while, for example, a plurality of concentric multiple tubes are arranged along the axis thereof. The burner is traversed and a flame hydrolysis reaction is applied to the outer periphery of the burner to deposit glass fine powder (soot), which will be the cladding of the optical fiber, to form a porous soot layer.
This is a method in which a transparent vitrified optical fiber preform is obtained by firing in a He gas atmosphere in a heating furnace, in which case the burner 2 is arranged at a right angle to the rod 1.

【０００３】[0003]

【発明が解決しようとする課題】このような従来の外付
法では、上記の如き焼成に際してバーナーの炎のロッド
２の上部における温度分布３ｂは前記図３に示したよう
に、ロッド１の下部におけるバーナー２の火炎の幅と略
等しく狭い。一般にバーナーから出てくる原料例えばＳ
ｉＣｌ4 が炎の中で化学反応によりＳｉＯ2 粒子とな
り、ロッド上に堆積するが、この粒子は炎内をサーモホ
レシス（Ｔｈｅｒｍｏｐｈｏｒｅｓｉｓ）現象に従い移
動する性質を持っている。このサーモホレシス現象と
は、大気中の熱エネルギー差（温度差）により粒子が低
エネルギー（低温度）の方へ移動して行く現象である。
前記の従来の技術によると、上記のようにバーナー２の
ロッド１に対する角度が直角であるので炎の当たる面積
が小さく、しかも炎内での温度分布３が極端なために、
粒子が移動する性質を生かしきれず、そのためにロッド
１に粒子が付着し難く原料が無駄になっているのが現状
である。In the conventional external attachment method as described above, the temperature distribution 3b in the upper portion of the rod 2 of the burner flame upon firing as described above has a lower portion of the rod 1 as shown in FIG. And the width of the flame of the burner 2 in FIG. Ingredients that generally come out of a burner, such as S
Although iCl 4 becomes SiO 2 particles by a chemical reaction in the flame and deposits on the rod, the particles have the property of moving in the flame in accordance with the thermophoresis phenomenon. The thermophoresis phenomenon is a phenomenon in which particles move toward low energy (low temperature) due to a difference in thermal energy (temperature difference) in the atmosphere.
According to the above-mentioned conventional technique, since the angle of the burner 2 with respect to the rod 1 is a right angle as described above, the area of contact with the flame is small, and the temperature distribution 3 in the flame is extremely large.
Under the present circumstances, it is difficult to make full use of the property of particles to move, and therefore it is difficult for particles to adhere to the rod 1 and the raw material is wasted.

【０００４】[0004]

【課題を解決するための手段】この発明は、上記の如き
課題を解決するために改良されたもので、ロッドの垂線
に対してバーナーを傾斜させてスートをロッド上に堆積
させることを特徴とする光ファイバ用母材の製造方法で
あり、これによりサーモホレシス効果を活用して粒子の
付着率を上昇させ、ロッド上に堆積する速度を上昇させ
るものである。なお、上記バーナーのロッドの垂線に対
する角度は５０°以下、好ましくは１０°〜４０°とさ
れる。The present invention has been improved to solve the above-mentioned problems and is characterized in that the burner is inclined with respect to the perpendicular of the rod to deposit the soot on the rod. This is a method for producing a base material for an optical fiber, in which the thermophoresis effect is utilized to increase the attachment rate of particles and increase the speed of deposition on the rod. The angle of the burner with respect to the perpendicular of the rod is 50 ° or less, preferably 10 ° to 40 °.

【０００５】[0005]

【実施例】本発明におけるロッドの垂線とバーナーの角
度は、図１に示すようにロッド１の垂線に対してバーナ
ー２の角度αを５０°以下に傾斜させて配置している。
しかるときロッド上部の炎の温度分布３ａは炎が傾斜し
てロッド１に当たっているのに対応して広くなってい
る。このようにしたものは、従来より炎の温度分布がな
だらかとなり、粒子がロッドに当たる率が上昇し、その
ため粒子の付着率が上がり、粒子の堆積速度すなわち単
位時間当たりの堆積量（重さ）が上昇した。図２は、バ
ーナーを傾斜させた本発明の方法のスートの堆積速度と
時間との関係を定性的に示したもので、図中破線は従来
のバーナーの角度０°の場合を示している。なお、本発
明において、ロッド１の垂線に対してバーナー２の角度
を５０°以下に傾斜させているが、傾斜角度を５０°以
下にした理由は以下のとおりである。角度を５０°を超
えて大きくすると、炎のロッドまでの距離が非常に長い
ものが出来、結局生成した粒子が拡散し過ぎその堆積速
度が従来と変わらないことが確認されたためである。
又、５０°以下といっても０では従来の技術であり、こ
れを超えて僅かでも傾斜させたものはそれだけ効果があ
る。尤も能率を考えると、１０°〜４０°が好ましい。The angle between the perpendicular of the rod and the burner in the present invention is such that the angle .alpha. Of the burner 2 is inclined to 50.degree. Or less with respect to the perpendicular of the rod 1 as shown in FIG.
At that time, the temperature distribution 3a of the flame on the upper part of the rod is wide corresponding to the slope of the flame hitting the rod 1. In such a case, the temperature distribution of the flame becomes gentler than in the past, and the rate of particles hitting the rod increases, which increases the particle attachment rate, and the particle deposition rate, that is, the amount (weight) of particles deposited per unit time is increased. Rose. FIG. 2 qualitatively shows the relationship between the soot deposition rate and time in the method of the present invention in which the burner is inclined, and the broken line in the figure shows the case where the conventional burner angle is 0 °. In the present invention, the burner 2 is inclined at an angle of 50 ° or less with respect to the perpendicular of the rod 1, but the reason for setting the inclination angle at 50 ° or less is as follows. This is because it was confirmed that when the angle was increased to more than 50 °, the distance of the flame to the rod was very long, and eventually the generated particles were excessively diffused and the deposition rate was the same as in the conventional case.
Further, even if it is 50 ° or less, 0 is a conventional technique, and a device that is slightly inclined beyond this is effective. Considering efficiency, however, 10 ° to 40 ° is preferable.

【０００６】次に本発明の具体例について述べる。 具体例１：石英系ガラスロッドからなる少なくともコア
となる部分を含む出発部材の外周に外付法によりクラッ
ド部を形成するに際して、バーナーのロッドに対する角
度を１０°に傾斜させてバーナーからＳｉＣｌ4 を火炎
噴射せしめ、ＳｉＣｌ4 を火炎中でＳｉＯ2 粒子とし、
ロッド上に堆積させた。ＳｉＯ2 粒子堆積量は従来と比
較して単位時間当たり８％上昇した。 具体例２：石英系ガラスロッドからなる少なくともコア
となる部分を含む出発部材の外周に外付法によりクラッ
ド部を形成するに際して、バーナーのロッドに対する角
度を３０°に傾斜させてバーナーからＳｉＣｌ4 を火炎
噴射せしめ、ＳｉＣｌ4 を火炎中でＳｉＯ2 粒子とし、
ロッド上に堆積させた。ＳｉＯ2 粒子堆積量は従来と比
較して単位時間当たり１０％上昇した。 具体例３：石英系ガラスロッドからなる少なくともコア
となる部分を含む出発部材の外周に外付法によりクラッ
ド部を形成するに際して、バーナーのロッドに対する角
度を４０°に傾斜させてバーナーからＳｉＣｌ4 を火炎
噴射せしめ、ＳｉＣｌ4 を火炎中でＳｉＯ2 粒子とし、
ロッド上に堆積させた。ＳｉＯ2 粒子堆積量は従来と比
較して単位時間当たり８％上昇した。Next, specific examples of the present invention will be described. Specific Example 1: When forming a clad portion on the outer periphery of a starting member including at least a core portion made of a silica-based glass rod by an external method, the angle of the burner with respect to the rod is inclined at 10 ° and SiCl 4 is supplied from the burner. Flame injection, SiCl 4 in the flame into SiO 2 particles,
Deposited on the rod. The amount of deposited SiO 2 particles increased by 8% per unit time as compared with the conventional case. Example 2: When forming a clad portion on the outer periphery of a starting member including at least a core portion made of a silica-based glass rod by an external attachment method, the burner is inclined at an angle of 30 ° with respect to SiCl 4 from the burner. Flame injection, SiCl 4 in the flame into SiO 2 particles,
Deposited on the rod. The amount of deposited SiO 2 particles increased by 10% per unit time as compared with the conventional case. Example 3: When forming a clad portion on the outer periphery of a starting member including at least a core portion made of a silica-based glass rod by an external attachment method, the burner is tilted at an angle of 40 ° to remove SiCl 4 from the burner. Flame injection, SiCl 4 in the flame into SiO 2 particles,
Deposited on the rod. The amount of deposited SiO 2 particles increased by 8% per unit time as compared with the conventional case.

【０００７】[0007]

【発明の効果】この発明の製造方法によれば、従来の技
術とは異なり、サーモホレシス現象を有効に利用するこ
とができるので、バーナーによって生成される原料粒子
が短時間に効果的にロッドに付着するので、生産能率を
向上し、しかも原料ロスが少なくなるので製品コストを
低減することができる。According to the manufacturing method of the present invention, unlike the prior art, the thermophoresis phenomenon can be effectively utilized, so that the raw material particles produced by the burner can be effectively attached to the rod in a short time. Therefore, the production efficiency can be improved, and the raw material loss can be reduced, so that the product cost can be reduced.

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

【図１】本発明の光ファイバ用母材の製造方法におけ
る、ロッドとバーナーの角度と温度の分布の説明図。FIG. 1 is an explanatory view of an angle distribution and a temperature distribution of a rod and a burner in a method for manufacturing an optical fiber preform according to the present invention.

【図２】バーナーをロッドに対して傾斜させた場合（本
発明）と、９０°にした場合（従来）の粒子の堆積速度
と時間の関係グラフ。FIG. 2 is a graph showing the relationship between particle deposition rate and time when the burner is tilted with respect to the rod (the present invention) and when the burner is set at 90 ° (conventional).

【図３】従来の光ファイバ用母材の製造方法における、
ロッドとバーナーの角度と温度の分布の説明図。FIG. 3 is a view showing a conventional method for manufacturing a base material for an optical fiber,
Explanatory drawing of distribution of the angle and temperature of a rod and a burner.

【符号の説明】[Explanation of symbols]

１ ロッド ２ バーナー ３ａ，３ｂ 炎の温度分布 1 Rod 2 Burner 3a, 3b Flame temperature distribution

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 石英系ガラスロッドからなる少なくとも
コアとなる部分を含む出発部材の外周に外付法によりク
ラッド部を形成する光ファイバ用母材の製造方法におい
て、バーナーをロッドの垂線に対して傾斜させて配置
し、スートをロッド上に堆積させることを特徴とする光
ファイバ用母材の製造方法。1. A method for manufacturing an optical fiber preform in which a cladding is formed on the outer periphery of a starting member including at least a core portion made of a quartz glass rod by an external method, and a burner is provided with respect to a perpendicular line of the rod. A method of manufacturing a preform for optical fibers, which is arranged so as to be inclined and soot is deposited on a rod. 【請求項２】 バーナーのロッドの垂線に対する角度が
５０°以下好ましくは１０°〜４０°であることを特徴
とする請求項１記載の光ファイバ用母材の製造方法。2. The method for producing an optical fiber preform according to claim 1, wherein the angle of the burner with respect to the perpendicular of the rod is 50 ° or less, preferably 10 ° to 40 °.
JP16331992A 1992-06-01 1992-06-01 Production of optical fiber preform Pending JPH05330843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16331992A JPH05330843A (en) 1992-06-01 1992-06-01 Production of optical fiber preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16331992A JPH05330843A (en) 1992-06-01 1992-06-01 Production of optical fiber preform

Publications (1)

Publication Number Publication Date
JPH05330843A true JPH05330843A (en) 1993-12-14

Family

ID=15771584

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16331992A Pending JPH05330843A (en) 1992-06-01 1992-06-01 Production of optical fiber preform

Country Status (1)

Country Link
JP (1) JPH05330843A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030070223A (en) * 2002-02-21 2003-08-29 주식회사 세미텔 Apparatus for fabricating an optical fiber preform
US7159418B2 (en) * 2000-08-18 2007-01-09 Shin-Etsu Chemical Co, Ltd. Method of producing synthetic quartz glass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7159418B2 (en) * 2000-08-18 2007-01-09 Shin-Etsu Chemical Co, Ltd. Method of producing synthetic quartz glass
KR20030070223A (en) * 2002-02-21 2003-08-29 주식회사 세미텔 Apparatus for fabricating an optical fiber preform

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