JPS59141438A - Manufacture of optical fiber preform - Google Patents

Manufacture of optical fiber preform

Info

Publication number
JPS59141438A
JPS59141438A JP1548983A JP1548983A JPS59141438A JP S59141438 A JPS59141438 A JP S59141438A JP 1548983 A JP1548983 A JP 1548983A JP 1548983 A JP1548983 A JP 1548983A JP S59141438 A JPS59141438 A JP S59141438A
Authority
JP
Japan
Prior art keywords
glass
core
rod
glass rod
dopant
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
JP1548983A
Other languages
Japanese (ja)
Other versions
JPH0324420B2 (en
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 JP1548983A priority Critical patent/JPS59141438A/en
Publication of JPS59141438A publication Critical patent/JPS59141438A/en
Publication of JPH0324420B2 publication Critical patent/JPH0324420B2/ja
Granted 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To obtain a preform for low-loss single-mode optical fiber having excellent polarization maintaining property, by depositing glass soot to the circumference of a glass rod core while periodically varying the dopant concentration in the raw material gas synchronously with the rotation of the rod. CONSTITUTION:Glass soot is deposited to the circumference of the rotating glass rod 21 for core or having a core-clad structure by the flame hydrolysis using the torch 24 for synthesizing glass soot. The concentration of dopant (GeCl4, POCl4, TiCl4 or BBr3) in the raw material gas (SiCl4 and the dopant) supplied to the torch 24 is varied periodically and synchronously with the rotation of the rod 21. After forming a porous glass layer to the circumference of the glass rod 21, it is heated and sintered at a high temperature to obtain the objective preform.

Description

【発明の詳細な説明】 本発明は低損失で、偏波保持性に優れた単一モードファ
イバ用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 for manufacturing a base material for a single mode fiber that has low loss and excellent polarization maintaining properties.

第１図は、一般に偏波保持ファイバ（あるいは単一偏波
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、
８は応力付与部、４はジャケット部である。このファイ
バの特徴は、ジャケット部（通常、純Ｓｉｎ、ガラス）
４とは熱膨張係数の異なる応力付与部（５ｉｎ２−　Ｂ
２Ｏ３ガラス、または５ｉＯ２−Ｔｉ０２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、コア内を伝搬す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１“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（
す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,
8 is a stress applying part, and 4 is a jacket part. The characteristic of this fiber is that the jacket part (usually made of pure Sin, glass)
The stress applying part (5in2-B
2O3 glass or 5iO2-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 polarization propagate within the 1" core at different propagation velocities. Moreover, the state of this polarization is It will be kept in the longitudinal direction of the fiber (
In other words, it is polarization-maintaining).

従来、第１図に示した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、ロッドイン千ユ１−プ法が用い
られていた。すなわち、コア・クラッド構造を有するＶ
ＡＤ母材１本、５ｉｎ２−　ＴｉＯ２（またハＳｉｎ□
−Ｂ２０８）　カ’５　ス俸２本、純Ｓｉｏ２ガラス棒
２本を石英ガラス管内に封入し、これを２０００℃〜２
１００℃に加熱、線引きして光フ“。Conventionally, a rod-in, 1,000-fold method has been used to fabricate a polarization-maintaining fiber having the shape shown in FIG. That is, V with a core-clad structure
1 AD base material, 5in2-TiO2 (also HaSin□
-B208) Enclose two glass rods and two pure Sio2 glass rods in a quartz glass tube, and heat this at 2000℃ to 200℃.
Heat it to 100℃, draw it, and light it.

・アイイくとするものである。・It's something that makes you look good.

しかしながらこの方法では、石英管内に封入するため、
寸法精度の向上するのが難しいほか、光フアイバ内に気
泡、異物が取り込まれ易く、低損失化を図るのが善しい
、等の問題点があった。However, in this method, since it is sealed in a quartz tube,
In addition to being difficult to improve dimensional accuracy, there are other problems such as air bubbles and foreign matter are likely to be trapped inside the optical fiber, and it is better to aim for lower loss.

本発明はこれらの欠点を除去するために、回転するコア
用ガラス棒またはコア・クラッド構造を有するガラス棒
の周囲に、原料中のドーパント濃度を、回転に合わせて
、時間周期的に変化しながら、ガラス微粒子を堆積して
、多孔質ガラス層を形成した後、高温に加勢・焼結して
透明母材（光フアイバ母材）を得ることを特徴としたも
ので、その目的は、低損失で、高寸法精度、さらに偏波
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 eliminate these drawbacks, the present invention has been developed by changing the dopant concentration in the raw material around a rotating core glass rod or a glass rod having a core-clad structure while periodically changing the dopant concentration in accordance with the rotation. This method is characterized by depositing glass particles to form a porous glass layer, then applying high temperature and sintering to obtain a transparent base material (optical fiber base material).The purpose is to obtain a transparent base material (optical fiber base material). An object of the present invention is to provide a method for manufacturing a polarization-maintaining fiber that has high dimensional accuracy and excellent polarization-maintaining properties.

第２図は本発明の一実施例を示し、２１はコア用ガラス
棒またはコア・クラッド構造を有するガラス棒、２２は
多孔質ガラス層、２ｄは回転部、２４はガラス微粒子合
成トーチ、２５は火炎流、２６はドーパント濃度調整器
である。FIG. 2 shows an embodiment of the present invention, in which 21 is a glass rod for a core or a glass rod having a core-clad structure, 22 is a porous glass layer, 2d is a rotating part, 24 is a glass particle synthesis torch, and 25 is a glass rod having a core-clad structure. 26 is a dopant concentration regulator.

第２図において、回転するガラス棒２１の周囲に、合成
トーチ２４による０２−　Ｈ２火炎流２５内で合成した
ガラス微粒子を堆積し、多孔質ガラス層２２を形成する
ゝ。この際、合成トーチ２４に供給するガラス原料ガス
中のドーパント濃度を濃度調整器２６により、ガラス棒
２１の回転に合わせて、時間周期的に変化するものであ
る。こうして作製した母材を電気炉内において、焼結し
、透明母料を得る。In FIG. 2, glass fine particles synthesized in a 02-H2 flame stream 25 by a synthesis torch 24 are deposited around a rotating glass rod 21 to form a porous glass layer 22. At this time, the dopant concentration in the frit gas supplied to the synthesis torch 24 is changed periodically by the concentration regulator 26 in accordance with the rotation of the glass rod 21. The base material thus produced is sintered in an electric furnace to obtain a transparent base material.

たとえば第２図において、ガラス棒２１として、コア・
クラッド構造を有する（コアガラス：　Ｓｉｏ。For example, in FIG. 2, as the glass rod 21, the core
It has a cladding structure (core glass: Sio.

−Ｇｅｍ２（３％／ｌ／％）、タララドガラス：５１０
２、コア径／クラッド径比−３）ガラス棒を使用し、１
５　ｒｐｍで回転する。このガラス棒の側面に、毎分２
００ＣＣの割合でガフラス原料ガスを合成トーチ２４に
供給して、多孔質ガラスＮ２２を形成する。-Gem2 (3%/l/%), Tararad glass: 510
2. Core diameter/cladding diameter ratio - 3) Using a glass rod, 1
Rotates at 5 rpm. 2 per minute on the side of this glass rod.
The gaff glass raw material gas is supplied to the synthesis torch 24 at a rate of 0.00 CC to form porous glass N22.

この際、ガラス原料ガス中のドーパン）　（ＢＢｒ３を
使用）６度を、ガラス棒の回転に同期させ、１秒ごとに
０モル％と１０モル％の間を往復させる。At this time, the dopane in the frit gas (using BBr3) is synchronized with the rotation of the glass rod by 6 degrees to reciprocate between 0 mol % and 10 mol % every 1 second.

こうして作製した母材を１５００℃の温度下で焼、結し
、透明母材を得た。The base material thus produced was sintered and consolidated at a temperature of 1500°C to obtain a transparent base material.

この透明母材に石英管をジャケットして寸法合わせを行
い、コア径５μｍ１外径１２５μｍの単一モードファイ
バをｍ引きした。第３図は該単一モードファイバの断面
構造図である。This transparent base material was jacketed with a quartz tube, the dimensions were adjusted, and m single mode fibers with a core diameter of 5 μm and an outer diameter of 125 μm were drawn. FIG. 3 is a cross-sectional structural diagram of the single mode fiber.

第８図において、８１お上び８２はガラス棒中のコア・
クラッド部であり、８１は５ｉｎ２−　Ｇｅｍ２ガラス
のコア部、３２はＳｉｏ２ガラスのクラッド部である。In Fig. 8, 81 and 82 are the cores in the glass rod.
The cladding section includes a core section 81 made of 5in2-Gem2 glass, and a cladding section 32 made of Sio2 glass.

また８８は本発明の方法によって合成したクラッド層で
あり、この内に５ｉＯ−ＢＯ２２８ （１０モル％）ガラスの応力付与部３４がある。Further, 88 is a cladding layer synthesized by the method of the present invention, in which there is a stress applying portion 34 of 5iO-BO228 (10 mol %) glass.

３５は石英管によるジャケット部である。この単一モー
ドファイバの光損失を測定した結果、波長０．８５４ｍ
で２．１　ｄＢ／４　、波長１．８　μｍ　Ｔ　Ｏ，５
ｄＢ７％、波長１．５５１１ｍで０．２　ｄＢ／Ｊｍで
あり、またＨｅ　−Ｎｅレーザ（０，６３μｍ）を用い
たビート長（偏波保持特性を表わす指数）を測定した結
果、ビート長は０．５鰭であり、良好な偏波保持特性を
示した。35 is a jacket portion made of a quartz tube. As a result of measuring the optical loss of this single mode fiber, the wavelength was 0.854 m.
2.1 dB/4, wavelength 1.8 μm T O,5
dB7% and 0.2 dB/Jm at a wavelength of 1.5511 m, and as a result of measuring the beat length (an index representing polarization maintaining characteristics) using a He-Ne laser (0.63 μm), the beat length was 0. .5 fin, and showed good polarization-maintaining characteristics.

このファイバを長手方向に１００ｍごとに接続し、断面
構造を観察したところ、寸法再現性は良好で゛。When this fiber was connected every 100 m in the longitudinal direction and the cross-sectional structure was observed, the dimensional reproducibility was good.

・あった。·there were.

また第２図の実施例において、ト１−　　パント濃度の
周期的変化状態を変えれば、合成りラッド（第３図の３
３）中の応力付与部８４の寸法割合を変えることができ
る。さらに、第２図の実施例で応力付与部を含むクラッ
ド層を形成した後、顔合成りラッド層の上にＳ　ｉＯｓ
のみの多孔質ガラス層を形成すれば、寸法合わせに使用
した石英管ジャケットは不用となる。In addition, in the embodiment shown in Fig. 2, if the periodic change state of the to1-pant concentration is changed, the resultant compound rad (3 in Fig. 3) can be changed.
3) The dimensional ratio of the stress applying portion 84 inside can be changed. Furthermore, after forming the cladding layer including the stress applying portion in the embodiment shown in FIG.
If only a single porous glass layer is formed, the quartz tube jacket used for size adjustment becomes unnecessary.

また応力付与部を形成するために使用するドーパント材
としては、Ｂ、Ｏ，のほかに、ＴｉＯ２，ＳｎＯ２゜ｐ
ｂｏ　、　ｐ　ｏ　’、　ｃｅｏ２、およびＦ（７７素
）、等が６ 使用できる。In addition to B and O, the dopant materials used to form the stress applying portion include TiO2 and SnO2.
bo, po', ceo2, and F (77 elements) can be used.

また第２図の実施例において、コアガラス棒を使用する
場合には、この側面に直接、応力付与部を含むクラッド
層を合成することもできるが、まず５ｉｎ２ガラスのみ
のクラッド層を形成した後、応力付与部を含むクラッド
部を形成す・ることより、低損失な単一モードファイバ
が得られる。In addition, in the embodiment shown in Fig. 2, if a core glass rod is used, a cladding layer including a stress-applying portion can be directly synthesized on the side surface of the core glass rod. By forming a cladding portion including a stress applying portion, a single mode fiber with low loss can be obtained.

以上説明したように、本発明の光ファイバ母材、の製造
方法によれば、ロッドインチューブ法を用いることなく
、応力付与部を形成できるので、低摺失で高寸法精度、
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。As explained above, according to the manufacturing method of the optical fiber preform of the present invention, the stress-applying portion can be formed without using the rod-in-tube method.
Furthermore, there is an advantage that a polarization-maintaining fiber with excellent polarization-maintaining ability can be produced.

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

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偏波保持単一モード
ファイバの構造断面図である。 ｌ・・・コア、２・・・クラッド層、８・・・応力付与
部、４・・・ジャケット部、２１・・・コアガラス俸ま
たはコア・クラッド構造を有するガラス棒、２２・・・
多孔質ガラス層、２８・・・回転部、２４・・・ガラス
微粒子合成トーチ、２５・・・火炎流、２６・・・ドー
パント濃度調整器、３１・・・５１０２−　Ｇｅｏ２ガ
ラスのコア部、３２・・・５１０２ガラスのクラッド部
、３３・・・本発明の方法によって合成したクラッド層
、３４・・・５ｉｎ２−Ｂ２０８カラスの応力付与部、
３５・・・ジャケット部。 第１図 第２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 structural cross-sectional diagram of a polarization-maintaining single mode fiber manufactured according to the present invention. l...Core, 2...Clad layer, 8...Stress applying part, 4...Jacket part, 21...Glass rod having core glass bale or core-clad structure, 22...
Porous glass layer, 28... Rotating part, 24... Glass particle synthesis torch, 25... Flame flow, 26... Dopant concentration regulator, 31... 5102- Core part of Geo2 glass, 32 ...5102 Glass cladding part, 33... Cladding layer synthesized by the method of the present invention, 34...5in2-B208 glass stress applying part,
35...Jacket part. Figure 1 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】 １　回転するコア用ガラス棒またはコア・クラッド構造
を有するガラス棒の周囲に、Ｓ　ｉＣｊ　ｌ　４および
ドーパント（Ｇｅｅ／、　、　ＰＯ（３／８．　Ｔｉｏ
ｌ、　。 ＢＢｒ　８等）を原料とし、火炎加水分解法によってガ
ラス微粒子を堆積するに際して、原料ガス中の該ドーパ
ント濃度を、該コア用ガラス棒またはコア・クラッド構
造を有するガラ゛ス棒の回転に合わせて、時間周期的に
変化しながら、多孔質ガラス層を該ガラス棒の周囲に形
成した後、高温に加熱・焼結して透明母材を製造するこ
とを特徴とする光フアイバ母材の製造方法。[Claims] 1 Around a rotating core glass rod or a glass rod having a core-clad structure, S iCj l 4 and a dopant (Gee/, , PO (3/8.Tio
l. When depositing glass particles by flame hydrolysis using BBr 8, etc.) as a raw material, the concentration of the dopant in the raw material gas is adjusted in accordance with the rotation of the core glass rod or the glass rod having a core-clad structure. A method for producing an optical fiber preform, which comprises forming a porous glass layer around the glass rod while changing periodically over time, and then heating and sintering it at a high temperature to produce a transparent preform. .
JP1548983A 1983-02-03 1983-02-03 Manufacture of optical fiber preform Granted JPS59141438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1548983A JPS59141438A (en) 1983-02-03 1983-02-03 Manufacture of optical fiber preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1548983A JPS59141438A (en) 1983-02-03 1983-02-03 Manufacture of optical fiber preform

Publications (2)

Publication Number Publication Date
JPS59141438A true JPS59141438A (en) 1984-08-14
JPH0324420B2 JPH0324420B2 (en) 1991-04-03

Family

ID=11890205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1548983A Granted JPS59141438A (en) 1983-02-03 1983-02-03 Manufacture of optical fiber preform

Country Status (1)

Country Link
JP (1) JPS59141438A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6136132A (en) * 1984-07-26 1986-02-20 Fujitsu Ltd Manufacture of polarization-keeping optical fiber
JPS6172640A (en) * 1984-09-18 1986-04-14 Nippon Telegr & Teleph Corp <Ntt> Production of optical fiber preform
JPS6186441A (en) * 1984-10-05 1986-05-01 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus of porous base material for single polarization optical fiber

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6136132A (en) * 1984-07-26 1986-02-20 Fujitsu Ltd Manufacture of polarization-keeping optical fiber
JPH0210096B2 (en) * 1984-07-26 1990-03-06 Fujitsu Ltd
JPS6172640A (en) * 1984-09-18 1986-04-14 Nippon Telegr & Teleph Corp <Ntt> Production of optical fiber preform
JPH0338218B2 (en) * 1984-09-18 1991-06-10 Nippon Telegraph & Telephone
JPS6186441A (en) * 1984-10-05 1986-05-01 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus of porous base material for single polarization optical fiber

Also Published As

Publication number Publication date
JPH0324420B2 (en) 1991-04-03

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