JPS60186425A - Method for forming preform for stepped index-type optical fiber - Google Patents

Method for forming preform for stepped index-type optical fiber

Info

Publication number
JPS60186425A
JPS60186425A JP3732984A JP3732984A JPS60186425A JP S60186425 A JPS60186425 A JP S60186425A JP 3732984 A JP3732984 A JP 3732984A JP 3732984 A JP3732984 A JP 3732984A JP S60186425 A JPS60186425 A JP S60186425A
Authority
JP
Japan
Prior art keywords
refractive index
preform
oxide
soot
silicon oxide
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
JP3732984A
Other languages
Japanese (ja)
Other versions
JPH0712950B2 (en
Inventor
Katsuzo Inao
稲尾　勝三
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 JP59037329A priority Critical patent/JPH0712950B2/en
Publication of JPS60186425A publication Critical patent/JPS60186425A/en
Publication of JPH0712950B2 publication Critical patent/JPH0712950B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
    • C03B37/01282—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by pressing or sintering, e.g. hot-pressing

Landscapes

  • Engineering & Computer Science (AREA)
  • 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 obtain the titled preform having prescribed refractive index distribution and form, by integrating a silicon oxide soot cylinder to form a glass clad layer with an oxide powder having different refractive index from that of the above soot and inserted into said cylinder, and dehydrating and vitrifying the composite. CONSTITUTION:A glass clad cylinder 10 made of silicon oxide soot optionally doped with fluorine oxide, etc., is prepared beforehand. An oxide or silicon oxide powder 14 having a refractive index different from that of the soot is filled in the cylinder 10, and the composite is dehydrated, sintered and vitrified to obtain the preform 16 having stepped refractive index distribution. The clad layer and the core layer can be formed concentrically, and a preform can be manufactured at a high speed irrespective of the refractive index distribution and the form of the preform.

Description

【発明の詳細な説明】 本発明は、ステップインデックス型光ファイバ用プリフ
ォーム形成方法に関するものであるステ・リプインデッ
クス型光ファイバ用プリフォームは、一般に、コアとク
ラッドとを２本のバーナで形成して作られていたが、こ
の方法は相互に干渉し合うため所定のステップインデッ
クスの屈折率分布を得ることが難しく、またに偏心及び
偏肉し所定の形状を得ることができない」−に高速で合
成することができないで作業性が低い欠点があった。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a step-index optical fiber preform. Generally, a step-index optical fiber preform is formed by forming a core and a cladding using two burners. However, this method makes it difficult to obtain a refractive index distribution with a predetermined step index due to mutual interference, and also makes it impossible to obtain a predetermined shape due to eccentricity and uneven thickness. It has the disadvantage of being difficult to synthesize and has low workability.

本発明の目的は、所定の屈折率分布と形状を有するステ
ップインデックス型光ファイバ用プリフォームを高い作
業性で得ることができる方ｄ、ｙｆ提供することにある
。An object of the present invention is to provide a step index type optical fiber preform having a predetermined refractive index distribution and shape with high workability.

本発明の実施例を図面を参照して詳細に説明すると９図
面は本発明の方法を順に示し、先ず第１図に示すように
酸化けい素または弗素等の酸化物をドープした酸化けい
素から成るスート状ガラスクラ・ソド円筒部１０をＶＡ
Ｄ法またはＯＶＤ法によって形成する。このように形成
されたガラスクラッド円筒部１０は斜線で示された部分
を切断して機械的に成形し、第２図に示すように所定形
状とする。一方、第３図に示すように、シリカに醇化ゲ
ルマニウムをドープしガラスクラッド円筒部１０の屈折
率よりも小さい屈折率（例えば０．３％小さい）を有す
る母材１２をＶＡＤ法またはＯＶＤ法によって形成し、
この母材を粉砕して第４図に示すようにコア用の粉体１
４を形成する。次に、第５図に話すようにガラスクラッ
ド円筒部ｌＯ内にコア用の粉体１４を充填し、これらを
例えば塩素雰囲気内で１２００°Ｃで水抜きし、その後
例えば１６００℃で焼結してガラス化し、ステップイン
デックス型プリフォーム１６を形成する。Embodiments of the present invention will be described in detail with reference to the drawings.9 The drawings show the method of the present invention in order. First, as shown in FIG. 1, silicon oxide doped with an oxide such as silicon oxide or fluorine VA
It is formed by the D method or the OVD method. The glass clad cylindrical portion 10 thus formed is cut at the hatched portion and mechanically formed into a predetermined shape as shown in FIG. On the other hand, as shown in FIG. 3, a base material 12 made of silica doped with germanium oxide and having a refractive index smaller than that of the glass clad cylindrical part 10 (for example, 0.3% smaller) is prepared by a VAD method or an OVD method. form,
This base material is crushed to form powder 1 for the core as shown in Figure 4.
form 4. Next, as shown in FIG. 5, core powder 14 is filled in the glass clad cylindrical part lO, water is drained from the powder at 1200°C in a chlorine atmosphere, and then sintered at 1600°C. The step index type preform 16 is formed by vitrification.

このように、ガラスクランド円筒部とコアとを別個に形
成し、またガラスクラット円筒部を機械的に整形すると
、クランド層及びコア層共に均一な形状を有し、１１つ
偏心のないコアを得ることができる。In this way, by forming the glass crad cylindrical part and the core separately, and by mechanically shaping the glass crad cylindrical part, it is possible to obtain a core in which both the crand layer and the core layer have a uniform shape, and there is no eccentricity. be able to.

本発明によれば、に記のように、ステップインデ・ンク
ヌ型の光フアイバ用プリフォームのクラッド層及びコア
層を均一・な形状で偏心することな（得ることができる
ので所定のステップインデックス屈折率分布を得ること
ができ、またクラッド層及びコア層は形状及び屈折率分
布の制約がないため高速で合成することができるから作
業性が向上する芙益がある。According to the present invention, the cladding layer and the core layer of a step index Nkunu type optical fiber preform can be formed in a uniform shape without eccentricity (as described in 2), so that a predetermined step index refraction can be achieved. In addition, the cladding layer and the core layer can be synthesized at high speed since there are no restrictions on the shape and refractive index distribution, which has the advantage of improving workability.

【図面の簡単な説明】 第１図乃至第５図は本発明の方法によってステップイン
デックス型光ファイバ用プリフォームを形成する順序を
示す説明図である。 １１）−−−−−ガラスクラット円筒部、１２−−−−
−一母材、Ｌ４−−−−−コア用粉体、１６−−−−−
ステツプインデツクス型プリフォーム。 特許出願人 代理人　弁理士　菊池新− ＩＩ／　図 ８３１４　第４−図 第２１！Ｉ Ｗｒ図BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 5 are explanatory diagrams showing the order of forming a step index type optical fiber preform by the method of the present invention. 11)------Glass crat cylindrical part, 12------
-One base material, L4------ Powder for core, 16------
Step index type preform. Patent Applicant Agent Patent Attorney Arata Kikuchi-II/ Figure 8314 4-Figure 21! I Wr diagram

Claims (1)

【特許請求の範囲】[Claims] 酸化けい素または弗素等の酸化物をドープした酸化けい
素から成るスーし状ガラスクランド層円筒部を形成し、
前記円筒部内にゲルマニウム等の酸化物をドープし前記
クラッド層円筒部より屈折率の大きい酸化物または酸化
けい素を粉体で挿ノ、して一体化したのち水抜きしガラ
ス化することを特徴とするステップインデックス型光フ
ァイバ用プリフォーム形成力法。forming a cylindrical portion of a soot-like glass gland layer made of silicon oxide doped with an oxide such as silicon oxide or fluorine;
The cylindrical portion is doped with an oxide such as germanium, and an oxide or silicon oxide having a higher refractive index than the cylindrical portion of the cladding layer is injected into the cylindrical portion as a powder. After the cylindrical portion is integrated, water is drained and vitrified. Preform forming force method for step index type optical fiber.
JP59037329A 1984-03-01 1984-03-01 Method for forming preform for step index type optical fiber Expired - Lifetime JPH0712950B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59037329A JPH0712950B2 (en) 1984-03-01 1984-03-01 Method for forming preform for step index type optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59037329A JPH0712950B2 (en) 1984-03-01 1984-03-01 Method for forming preform for step index type optical fiber

Publications (2)

Publication Number Publication Date
JPS60186425A true JPS60186425A (en) 1985-09-21
JPH0712950B2 JPH0712950B2 (en) 1995-02-15

Family

ID=12494596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59037329A Expired - Lifetime JPH0712950B2 (en) 1984-03-01 1984-03-01 Method for forming preform for step index type optical fiber

Country Status (1)

Country Link
JP (1) JPH0712950B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006125614A1 (en) * 2005-05-26 2006-11-30 Heraeus Quarzglas Gmbh & Co. Kg A method for the production of solid quartz glass bodies

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50109735A (en) * 1974-02-05 1975-08-29
JPS51107313A (en) * 1975-03-19 1976-09-22 Hitachi Ltd GARASUNOSEI ZOHOHO

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50109735A (en) * 1974-02-05 1975-08-29
JPS51107313A (en) * 1975-03-19 1976-09-22 Hitachi Ltd GARASUNOSEI ZOHOHO

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006125614A1 (en) * 2005-05-26 2006-11-30 Heraeus Quarzglas Gmbh & Co. Kg A method for the production of solid quartz glass bodies

Also Published As

Publication number Publication date
JPH0712950B2 (en) 1995-02-15

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