JPS59141437A - Manufacture of optical fiber preform - Google Patents

Manufacture of optical fiber preform

Info

Publication number
JPS59141437A
JPS59141437A JP1548883A JP1548883A JPS59141437A JP S59141437 A JPS59141437 A JP S59141437A JP 1548883 A JP1548883 A JP 1548883A JP 1548883 A JP1548883 A JP 1548883A JP S59141437 A JPS59141437 A JP S59141437A
Authority
JP
Japan
Prior art keywords
torch
preform
glass
cladding
porous
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
JP1548883A
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 JP1548883A priority Critical patent/JPS59141437A/en
Publication of JPS59141437A publication Critical patent/JPS59141437A/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
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
    • 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
    • C03B2207/70—Control measures

Abstract

PURPOSE:To obtain an optical fiber preform having excellent polarization maintaining property, by using a torch to synthesize a porous preform and another torch for producing a clad, and periodically varying the dopant concentration of the glass raw material supplied to the clad torch. CONSTITUTION:An axially extending porous preform rod 21 is produced by using the torch 26 for synthesizing porous preform. The dopant concentration in the vapor of glass raw material supplied to the other torch 28 for cladding is varied periodically according to the rotation of the preform 21. The glass soot layer 33 is deposited to the side surface of the preform 21 using the torch 28. The product is heated and sintered at a high temperature to obtain a clear preform.

Description

【発明の詳細な説明】 本発明は低損失で、偏波保持性に浸れた単一モードファ
イバ用母材の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a preform for a single mode fiber with low loss and polarization maintaining properties.

第１図は、一般に偏波保持ファイバ（または単一偏波フ
ァイバ）と呼ばれているものの一つの断面構造図である
。第１図において、１はコア、２はクラッド層、３は応
力付与部、４はジャケラ１〜部である。このファイバの
特徴は、ジャケット部く通常、純Ｓｉ　０２ガラス）４
とば熱膨張係数の異なる応力付与部（Ｓｉ　０２−　Ｂ
２０３ガラスまたはＳｉ　０２−Ｔｉ　０２ガラス）３
によって、コア１に一定方向の応力が加わることである
。この結果、コア内を伝搬ツる基本モードの縮退が解け
、直交する偏波をもった二つのモードが、異なる伝搬速
度でコア内を伝搬することとなる。しかもこの偏波の状
態がファイバの長手方向に保たれることとなる（づなわ
ち偏波保持である）。FIG. 1 is a cross-sectional structural diagram of one of what is generally called a polarization maintaining fiber (or single polarization fiber). In FIG. 1, 1 is a core, 2 is a cladding layer, 3 is a stress applying part, and 4 is a jacket 1 to part. The characteristics of this fiber are that the jacket part is usually made of pure Si02 glass)4
Toba stress applying parts with different coefficients of thermal expansion (Si 02-B
203 glass or Si02-Ti02 glass)3
This means that stress is applied to the core 1 in a certain direction. As a result, the degeneracy of the fundamental mode propagating within the core is resolved, and two modes with orthogonal polarizations propagate within the core at different propagation speeds. Moreover, this state of polarization is maintained in the longitudinal direction of the fiber (that is, polarization is maintained).

従来、第１図に示すような形状の偏波保持ファイバを作
製する方法としては、ロンドインチューブ法が用いられ
ていた。すなわちコア・クラッド構造を有するＶＡＤ母
材１本、Ｓｉ　０２−丁１０２　（またはＳｉ　０２−
８２０３　）ガラス棒２本、純５１０２ガラス棒２本を
石英ガラス管内に封入し、これを２０００℃〜２１００
℃に加熱、線引きして、光ファイバとするものである。Conventionally, a rond-in-tube method has been used as a method for manufacturing a polarization-maintaining fiber having a shape as shown in FIG. That is, one VAD base material having a core-clad structure, Si 02-102 (or Si 02-
8203) Two glass rods and two pure 5102 glass rods are sealed in a quartz glass tube, and heated at 2000°C to 2100°C.
It is heated to ℃ and drawn to make an optical fiber.

しかしなからこの方法では、石英管内に」１人りるため
、用法精度の向上づるのが難しいほか、光フアイバ内に
気泡、異物が取り込まれ易く、低損失化を図ることが難
しい、等の問題点があった。However, with this method, only one person is placed inside the quartz tube, which makes it difficult to improve the accuracy of use, and also makes it difficult to reduce loss as air bubbles and foreign matter are easily trapped in the optical fiber. There was a problem.

本発明はこれらの問題点を解決づるために、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
焼結して透明画（Ａを得る光ファイバの製造方法、すな
わちＶＡＤ法において、多孔質ｆｌＪ　＋、１の側面に
カラス微粒子層を堆積づ−るに際して、クラッド１−−
チに供給するドーパント濃度を多孔質母材の回転に従い
、時間周期的に変化しながら、多孔質母材を形成した後
、焼結して透明画材を得ることを特徴どしたもので、そ
の目的は、低損失で、高１法精度、ざらに偏波保持性に
優れた偏波保持ファイバの製造方法を提供することにあ
る。In order to solve these problems, the present invention provides a method for manufacturing an optical fiber in which glass fine particles are deposited in the axial direction to form a porous base material, and then this is sintered to obtain a transparent image (A). In the VAD method, when depositing a glass fine particle layer on the side surface of the porous flJ+, 1, the cladding 1--
The purpose of this method is to form a porous base material by changing the dopant concentration supplied to the base material periodically according to the rotation of the porous base material, and then sintering it to obtain a transparent painting material. An object of the present invention is to provide a method for manufacturing a polarization-maintaining fiber having low loss, high first-method accuracy, and roughly excellent polarization-maintaining properties.

第２図は本発明の一実施例を示し、２１はコア多孔質母
材、２２はクラッド層（Ｉ＞、２３はクラッド層（ｌｒ
）、２４はクラッド層（ＩＩＩ）、２りは形成された多
孔質母材、２６はコアｉ〜−チ、２７はクララ１−トー
チ（ｉ）、２８はクラッドトーチ（ＩＩ）、２９はクラ
ットトーチ（Ｉ［［＞、２１０はドーパント供給量調整
器である。第２図において、コアトーチ２６にＳｉＣρ
４、ＧｅＣｊ２ａ等のガラス原料ガスを供給し、ｆ−１
２−０２炎による加水分解反応によって生成したガラス
微粒子を堆積して、コア多孔質母材２１を形成する。次
に上部に設けられたクラットトーチ（Ｉ）２７によって
、Ｓｉ　０２ガラス微粒子を堆積させ、クラッド層（Ｉ
）２２を形成する。次にクラッドトーチ（Ｉ［）２８に
よってガラス微粒子を堆積させて、クラッド層（ＩＩ）
２３を形成する訳であるが、この際、クラッドトーチ−
（ＩＩ）２８に供給するカラス原料ガス中のビーパン１
〜量をドーパント供給量調整器２１０によって、時間周
期的に変化させる。こうして形成したクラッド層（ｎ）
２３の上に、最後にクラットトーチ（Ｉ［［）２９によ
ってＳｉ　０２ガラス微粒子を堆積させ、クラッド層（
Ｉ［Ｉ）２４を形成する。こうして多孔質母材２５）を
得、さらに焼結して、透明母材を得るものＣある。FIG. 2 shows an embodiment of the present invention, in which 21 is a core porous base material, 22 is a cladding layer (I>, 23 is a cladding layer (lr
), 24 is the cladding layer (III), 2 is the formed porous base material, 26 is the core i~-chi, 27 is the Clara 1-torch (i), 28 is the cladding torch (II), 29 is the cladding Torch (I[[>, 210 is a dopant supply amount regulator. In FIG. 2, SiCρ
4. Supply glass raw material gas such as GeCj2a, f-1
2-02 A core porous base material 21 is formed by depositing glass particles generated by a hydrolysis reaction using a flame. Next, Si02 glass fine particles are deposited using the cladding torch (I) 27 provided at the top to form a cladding layer (I).
)22 is formed. Next, glass fine particles are deposited using a cladding torch (I[) 28 to form a cladding layer (II).
23, but at this time, the clad torch
(II) Beepan 1 in the glass raw material gas supplied to 28
- amount is changed periodically by the dopant supply amount regulator 210. Cladding layer (n) thus formed
Finally, Si02 glass particles are deposited on top of the cladding layer (
I[I)24 is formed. In this way, a porous base material 25) is obtained and further sintered to obtain a transparent base material C.

たどλに１この実施例において、コア１−−チ２６に毎
分１０ＣＣのガラス原料カス（Ｓｉ　Ｃ４４９０モル％
、ＧｅＣＪ２４３モル％）を、クラッドトープ（ｉ）２
７に毎分４０ｃｃの３ｉＣＡ４を、クラッド１ヘーヂ（
［）２８に１００ｃｃのガラス原料（Ｓｉ　ＣＪ２４　
Ｊ−３よびＢＢｒ　３　）を、さらにクラッド１〜−ヂ
（ＩＩＩ）２９に１００ｃｃの一８ｉＣβ４をそれぞれ
供給し、またクラットトーチ（Ｉ）２８に供給づるガラ
ス原１Ｆ３１ガス中のＢＢｒ３１１ｆａ度を多孔質ＢＪ
　＋、ｆの１７／４回転ごとに、０モル％から１０モル
％まで段階的に変えて多孔質母材を形成した後、１５０
０℃の温度下で焼結して透明ｆｆｌ材を作製すると、透
明画材中には、第３図に示１断面図のような構造が形成
されていた。In this example, 10 CC of frit waste (Si C4490 mol%
, GeCJ243 mol%), cladtope (i)2
7 to 40cc/min 3iCA4, cladding 1hage (
[)28 to 100cc of glass raw material (Si CJ24
J-3 and BBr 3 ), and further 100 cc of 18iCβ4 to the claddings 1 to 2 (III) 29, and the BBr311fa degree in the glass source 1F31 gas supplied to the cladding torch (I) 28 was made into a porous material. BJ
After forming a porous base material by changing stepwise from 0 mol% to 10 mol% every 17/4 rotation of +, f, 150
When a transparent ffl material was produced by sintering at a temperature of 0° C., a structure as shown in the cross-sectional view shown in FIG. 3 was formed in the transparent painting material.

ｒＪなりち第３図において、３１は二］アトーチににツ
て形成されたＳｉ　０２−Ｇｅ　０２　　（３モル％）
ガラスのコア部、３２はクラッド１〜−ヂ（Ｉ＞によっ
て形成されたＳｉ　０２ガラスのクラッド層、３３はク
ラッドトーチ（ＩＩ）によって形成されたクラッド層、
３４はこのクララ１〜層３３内に形成された５１０２−
Ｂ２０３　（１０Ｅ−ル％）ガラスの応カイ」−句部で
あり、さらに３５はクラッドトーチ（Ｉ［［）によって
形成されたＳｉ　０２カラスのクラッド層である。rJNarichi In Figure 3, 31 is Si02-Ge02 (3 mol%) formed during the 2] torch.
A core portion of glass, 32 a cladding layer of Si02 glass formed by cladding 1 to -di (I>, 33 a cladding layer formed by a cladding torch (II),
34 is 5102- formed in this Clara 1 to layer 33.
35 is a cladding layer of Si02 glass formed by a cladding torch (I[[)].

こうして製造した透明画材を外径１２５μｍ、コア径５
μｍに線引きし、損失を測定した結果、波長０．８５μ
ｍで２．１ｄ　Ｂ／Ｋｍ　、波長１．３μｍで０．５ｄ
　Ｂ／Ｋｍ　、波長１．５５μｍで０．２ｄ　Ｂ／Ｋｍ
と低損失であった。またｌ−１ｅ−Ｎｅレーザ（０，６
３μｍ）偏波保持性の測定をした結果、ビート長（偏波
保持性を表わり指数）で、Ｑ、５ｍｍ程度と良好な偏波
保持性を示した。The thus produced transparent art material had an outer diameter of 125 μm and a core diameter of 5
As a result of drawing a line in μm and measuring the loss, the wavelength was 0.85 μm.
2.1d B/Km at m, 0.5d at wavelength 1.3μm
B/Km, 0.2d B/Km at wavelength 1.55μm
The loss was low. In addition, l-1e-Ne laser (0,6
As a result of measuring the polarization-maintaining property (3 μm), the beat length (an index representing polarization-maintaining property) was approximately 5 mm, indicating good polarization-maintaining property.

本発明において、応カイ」与部に使用するトーパン１〜
材としては、Ｂ２０３のほか、１−ｉＱ２、Ｐ２０５　
、Ｓｎ　０２　、Ｐｂ　Ｏ，＋Ｇｅ　０２およびに（フ
ッ素）、等が使用できる。In the present invention, toppans 1 to 1 to be used for the auxiliary part
In addition to B203, the materials include 1-iQ2 and P205.
, Sn 02 , Pb 2 O, +Ge 02 and (fluorine), etc. can be used.

以上説明したように、本発明の光ファイバ母（Ａの製造
方法によれば、ＶＡＤ法の多孔質母祠作製詩に、応力付
与部を形成できるので、低損失で、高寸法精度、さらに
偏波保持能力に優れた偏波保持ファイバを作製できる利
点があるほか、軸方向に母材を連続製造できるＶＡＤ法
の特長を生かして、長尺な偏波保持ファイバを得ること
ができる利点がある。As explained above, according to the manufacturing method of the optical fiber motherboard (A) of the present invention, a stress-applying portion can be formed in the porous motherboard produced by the VAD method, resulting in low loss, high dimensional accuracy, and even polarization. In addition to being able to produce polarization-maintaining fibers with excellent wave-holding ability, this method also has the advantage of being able to produce long polarization-maintaining fibers by taking advantage of the VAD method's ability to continuously manufacture base materials in the axial direction. .

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

第１図は偏波保持ファイバの断面構造図、第２図は本発
明の一実施例図、 第３図は本発明によって製造された透明母材の断面構造
図、である。 １・・・コア　　　　　　　２・・・クラッド層３・・
・応カイ′Ｊ与部　　　４・・・ジ１ｚケッ１へ部２１
・・・コア多孔質母材　２２・・・クラッド層（ｆ）２
３・・・クラッド層（ｆｆｌ　）　２４・・・クラッド
Ｉ（ＩＩＩ）２５・・・形成された多孔質母材 ２６・・・コアｊ−−チ　　　２７・・・クラッドトー
チ（°■）２８・・・クラッド１〜−ヂ（Ｕ） ２９・・・クラッドトーチ（ＩＩＩ） ２１０・・・ビーパン１〜供給量調整器３１・・・コア
１〜−ヂによって形成されたＳｉ　０２−ＧｅＯ２（３
モル％）、ガラスのコア部３２・・・クラッドトーチ（
Ｉ）によって形成されたＳｉ　０２ガラスのクラッド層 ３３・・・クラッドトーチ（ＩＩ）によって形成された
クラッド層 ３４・・・クラッド層内に形成されたＳｉ　０２−］３
２０３　（１０モル％）ガラスの応力付与部３５・・・
、クラッドトーチ（ＩＩ［）によって形成されたＳｉ　
０２ガラスのクラッド層。 特許出願人　　　日本電信電話公社 第１図 第３図FIG. 1 is a cross-sectional structural diagram of a polarization-maintaining fiber, FIG. 2 is a diagram of an embodiment of the present invention, and FIG. 3 is a cross-sectional structural diagram of a transparent base material manufactured according to the present invention. 1...Core 2...Clad layer 3...
・Okai'J Yobe 4...Ji 1z Ket 1 Part 21
... Core porous base material 22 ... Cladding layer (f) 2
3... Clad layer (ffl) 24... Clad I (III) 25... Formed porous base material 26... Core j--chi 27... Clad torch (°■) 28. ... cladding 1 to -di (U) 29... cladding torch (III) 210... bee pan 1 to supply amount regulator 31... Si 02-GeO2 (3) formed by core 1 to -di
mole%), glass core part 32... clad torch (
Si 02 glass cladding layer 33 formed by cladding torch (II)... cladding layer 34 formed by cladding torch (II)... Si 02-]3 formed within the cladding layer
203 (10 mol%) glass stress applying part 35...
, Si formed by cladding torch (II[)
02 glass cladding layer. Patent applicant: Nippon Telegraph and Telephone Public Corporation Figure 1 Figure 3

Claims (1)

【特許請求の範囲】[Claims] １、ガラス微粒子を軸方向に堆積して多孔゛質画材を形
成した後、これを焼結して透明Ｅ−Ｌ　ｌｒＡを得る光
フアイバ母材の製造方法において、軸方向に形成した丸
棒状・多孔買母月の側面に、該多孔質母材合成用トーチ
とは別のクラット１−−チを用いてガラス微粒子層を堆
積するに際して、該クラッド１〜−チに供給するガラス
原お１ガス中のドーパント潤度を、多孔？１母（Ａの回
転に従い時間周期的に変化しながら、多孔質ｆｆｌ材を
形成した後、焼結して透明１’ＪＪ何を製造することを
特徴とする光′ファイバ母材の製造方法。1. In the method for producing an optical fiber base material in which a porous medium is formed by depositing glass particles in the axial direction and then sintered to obtain a transparent E-LlrA, a round rod shape formed in the axial direction is used. When depositing a glass fine particle layer on the side surface of the porous base material using a cladding 1--chi different from the porous base material synthesis torch, a glass source and a gas supplied to the cladding 1--chi. Is the moisture content of the dopant inside porous? A method for manufacturing an optical fiber preform, which comprises forming a porous FFL material while changing periodically according to the rotation of a preform A, and then sintering it to produce a transparent preform.
JP1548883A 1983-02-03 1983-02-03 Manufacture of optical fiber preform Pending JPS59141437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1548883A JPS59141437A (en) 1983-02-03 1983-02-03 Manufacture of optical fiber preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1548883A JPS59141437A (en) 1983-02-03 1983-02-03 Manufacture of optical fiber preform

Publications (1)

Publication Number Publication Date
JPS59141437A true JPS59141437A (en) 1984-08-14

Family

ID=11890177

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1548883A Pending JPS59141437A (en) 1983-02-03 1983-02-03 Manufacture of optical fiber preform

Country Status (1)

Country Link
JP (1) JPS59141437A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6476929A (en) * 1987-09-18 1989-03-23 Hitachi Cable Production of optical fiber preserving plane of polarization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6476929A (en) * 1987-09-18 1989-03-23 Hitachi Cable Production of optical fiber preserving plane of polarization

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