JPS6124340B2 - - Google Patents
Info
- Publication number
- JPS6124340B2 JPS6124340B2 JP9912582A JP9912582A JPS6124340B2 JP S6124340 B2 JPS6124340 B2 JP S6124340B2 JP 9912582 A JP9912582 A JP 9912582A JP 9912582 A JP9912582 A JP 9912582A JP S6124340 B2 JPS6124340 B2 JP S6124340B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- glass
- glass tube
- rod
- clad
- 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.)
- Expired
Links
- 239000011521 glass Substances 0.000 claims description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910005793 GeO 2 Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 5
- 239000011162 core material Substances 0.000 description 32
- 238000000034 method Methods 0.000 description 11
- 239000000835 fiber Substances 0.000 description 10
- 238000005253 cladding Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010574 gas phase reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02754—Solid fibres drawn from hollow preforms
-
- 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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/12—Drawing solid optical fibre directly from a hollow preform
- C03B2205/14—Drawing solid optical fibre directly from a hollow preform comprising collapse of an outer tube onto an inner central solid preform rod
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/12—Drawing solid optical fibre directly from a hollow preform
- C03B2205/16—Drawing solid optical fibre directly from a hollow preform the drawn fibre consisting of circularly symmetric core and clad
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)
Description
本発明は寸法精度の秀れた長尺フアイバを生産
性良く得る光フアイバの製造方法に関する。
従来、光フアイバの製造法としては、、第１
図に示す、コア用ガラス棒１をクラツドガラス管
２中に入れたものを、予め加熱溶着することなく
直ちに加熱炉３中に入れて線引きする方法および
、第２図に示す、コア用ガラス棒１をクラツド
ガラス管２中に入れて加熱溶着してコラツプス４
とした後、加熱炉３中で線引きする方法が知られ
ている。また、クラツドガラスとしては耐候性、
機械的強度に秀れたSiO2ガラスが用いられ、コ
ア用ガラスとしては、光の吸収損失の少ない
GeO2などを添加したガラスが用いられている。
しかしながら、これら従来法には次のような問
題があつた。すなわちの方法は、工程が短か
く、大型コア棒、クラツド管を作つて長尺フアイ
バを得ることができるものの、フアイバのコア寸
法精度が良くなく、特にSiO2クラツドド−プト
SiO2コアガラスなどで、コアとクラツドの屈折
率差の大きな、いわゆる高NAフアイバのように
コアガラス、クラツドガラスの粘性差が大きい
と、コアの真円度が不良になつて、だ円になり易
く、また線引時のコア材のズリ上りによりコア径
が設定値より小さくなる場合がある。一方、の
方法はクラツドとなるべく厚肉のガラス管を、コ
ア材の周囲に一見、加熱溶着する工程が、ガラス
管の加熱による収縮が遅いため極めて難かしいも
ので、非能率である。
本発明はこれら従来法の欠点を改良してコア寸
法精度の秀れた長尺フアイバを生産性良く得る方
法を提供するもので、第３図に示すように、コア
用のGeO2含有石英ガラス母材棒１を、その肉厚
が該コア用ガラス母材棒の外径の５〜15％である
第１の石英ガラス管（第１クラツド）２１に入れ
て加熱溶着による一体化を行ない、この構成体４
を第２の石英ガラス管（第２クラド）２２に挿入
し、加熱溶着を行うことなく直ちに加熱炉３中に
入れて線引きする、すなわちロツドイン線引する
ことを特徴とする光フアイバの製造方法に関する
ものである。
本発明において第１のガラス管の肉厚について
は、コアガラスの外径寸法に対し、第４図の斜線
部５に示す範囲、すなわち５〜15％を選ぶのが適
当である。この領域より小さいと、コラプス工程
における加熱時にコア材が十分加熱されない前に
第１ガラス管の変形が生じ、コアと第１ガラス管
の密着度が不良となつたり、第１ガラス管の局部
的に不均一な変形が生じ易くなる。また、この領
域より大きいと、本発明の効果は小さくなる。第
１ガラス管の内径としては、コアガラスの外径よ
り0.5〜１mm程度大きな寸法を選ぶことが好まし
い。また、第２のガラス管については、得ようと
するフアイバのコア径／クラツド径比により異な
り、第１のガラス管を上記に示した様に決めてか
ら、所定のコア径／クラツド径比となる様に第２
のガラス管の肉厚を選べばよい。このとき、内径
としては、第１のガラス管をコラプスした後の構
成体４の外径より約0.5〜1.0mm程度大きく選ぶの
が適当である。コアガラスの材料としては、
GeO2をドープしたSiO2ガラスが気相反応により
比較的簡単に合成でき、また、通常の可視〜近赤
外領域の波長では光の吸収ピークがなく、伝送特
性上良好なガラスが得られるため好ましい。クラ
ツド材料としては、SiO2ガラスが強度、耐候性
等良好であり、また容易に入手できるため好んで
用いられる。コア材として、GeO2濃度を上げた
高NAフアイバを構成させる時、本発明はより効
果を発揮する。
本発明方法で、薄肉の第１ガラス管をコアガラ
スにコラツプスすることは容易であり、またこの
構成体を第２のガラス管と組合せてロツドイン線
引するときには、コアガラスの粘性がクラツドガ
ラスより相当小さくとも、第１のガラス管の溶着
のためにコアの変形、ズレ上りなどが抑えられる
ので、コア寸法精度の秀れた長尺フアイバを生産
性良く得ることができる。
実施例
コア用ガラス棒として、GeO2をコアの中央部
で約30重量％含有したセミステツプ状のSiO2−
GeO2ガラスを準備した。また第１、第２のガラ
ス管として石英ガラス管を準備した。これらの外
径、断面積を第１表に示す。
The present invention relates to a method for manufacturing optical fibers that can produce long fibers with excellent dimensional accuracy with high productivity. Conventionally, the first method for manufacturing optical fibers is
A method of drawing a core glass rod 1 placed in a clad glass tube 2 as shown in the figure and immediately placing it in a heating furnace 3 without heating and welding it in advance; Put it into the clad glass tube 2, heat weld it, and collapse it 4.
A method is known in which the wire is drawn in a heating furnace 3 after the wire is heated. In addition, as clad glass, it is weather resistant,
SiO 2 glass, which has excellent mechanical strength, is used as the core glass because it has low light absorption loss.
Glass doped with GeO 2 etc. is used. However, these conventional methods have the following problems. In other words, although the process is short and long fibers can be obtained by making large core rods and clad tubes, the dimensional accuracy of the fiber core is not good, especially for SiO 2 clad doped tubes.
If there is a large difference in viscosity between the core glass and cladding glass, such as in a so-called high-NA fiber with a large difference in refractive index between the core and cladding, such as SiO 2 core glass, the roundness of the core becomes poor and becomes an ellipse. Moreover, the core diameter may become smaller than the set value due to shearing of the core material during drawing. On the other hand, the process of heating and welding a thick-walled glass tube to form the cladding around the core material is extremely difficult and inefficient because the glass tube shrinks slowly due to heating. The present invention improves the drawbacks of these conventional methods and provides a method for obtaining long fibers with excellent core dimensional accuracy with high productivity.As shown in FIG . The base material rod 1 is placed in a first quartz glass tube (first clad) 21 whose wall thickness is 5 to 15% of the outer diameter of the glass base material rod for the core, and is integrated by heat welding. , this construct 4
A method for manufacturing an optical fiber characterized by inserting it into a second quartz glass tube (second cladding) 22 and immediately putting it into a heating furnace 3 and drawing it without performing heat welding, that is, rod-in drawing. It is related to. In the present invention, the thickness of the first glass tube is appropriately selected to be within the range shown by the shaded area 5 in FIG. 4, that is, 5 to 15% of the outer diameter of the core glass. If it is smaller than this range, the first glass tube will deform before the core material is not sufficiently heated during heating in the collapse process, resulting in poor adhesion between the core and the first glass tube, or localized damage to the first glass tube. Non-uniform deformation is likely to occur. Moreover, if it is larger than this range, the effect of the present invention will be reduced. The inner diameter of the first glass tube is preferably selected to be about 0.5 to 1 mm larger than the outer diameter of the core glass. Regarding the second glass tube, it depends on the core diameter/cladding diameter ratio of the fiber to be obtained, and after determining the first glass tube as shown above, it is necessary to set the predetermined core diameter/cladding diameter ratio The second
All you have to do is choose the wall thickness of the glass tube. At this time, it is appropriate to select the inner diameter to be about 0.5 to 1.0 mm larger than the outer diameter of the structure 4 after collapsing the first glass tube. The core glass material is
SiO 2 glass doped with GeO 2 can be synthesized relatively easily by gas-phase reaction, and there is no light absorption peak at wavelengths in the normal visible to near-infrared region, resulting in a glass with good transmission characteristics. preferable. As the cladding material, SiO 2 glass is preferably used because it has good strength, weather resistance, etc., and is easily available. The present invention is more effective when a high NA fiber with increased GeO 2 concentration is used as the core material. With the method of the invention, it is easy to collapse a thin-walled first glass tube onto a core glass, and when this structure is combined with a second glass tube for rod-in drawing, the viscosity of the core glass is considerably greater than that of the clad glass. Even if it is small, deformation and misalignment of the core are suppressed due to welding of the first glass tube, so a long fiber with excellent core dimensional accuracy can be obtained with high productivity. Example As a glass rod for the core, a semi-step-shaped SiO 2 − containing about 30% by weight of GeO 2 in the center of the core was used.
Prepared GeO2 glass. Furthermore, quartz glass tubes were prepared as the first and second glass tubes. Table 1 shows their outer diameters and cross-sectional areas.
【表】
コア棒を第１ガラス管内に挿入した状態で第１
ガラス管をガラス旋盤にセツトし、ガラス管を回
転しながら片端を酸水素バーナにて加熱し、第１
ガラス管の内部を0.5気圧程度に減圧しながら、
バーナを片方から他方へ移動させることで、コア
棒と第１ガラス管を溶着一体化した。この操作で
得られたコア−第１クラツド構成体を、第２ガラ
ス管にセツトし、線引炉で外径140μｍに線引し
た（線引時には、１mmH2O程度に減圧してい
る。）得られたフアイバのコア形精度は100μｍ±
0.1μｍ程度の極めて良好な寸法を有するフアイ
バが得られた。[Table] With the core rod inserted into the first glass tube,
Set the glass tube in a glass lathe, and heat one end with an oxyhydrogen burner while rotating the glass tube.
While reducing the pressure inside the glass tube to about 0.5 atmospheres,
By moving the burner from one side to the other, the core rod and the first glass tube were welded and integrated. The core-first clad structure obtained by this operation was set in a second glass tube and drawn in a drawing furnace to an outer diameter of 140 μm (during drawing, the pressure was reduced to about 1 mmH 2 O). The core shape accuracy of the obtained fiber is 100μm±
Fibers with very good dimensions of the order of 0.1 μm were obtained.
第１〜第３図は、コア用ガラス棒とクラツド管
とを組合せて光フアイバを製造する方法を示す図
であり、第１図、第２図が従来法に関し、第３図
が本発明方法に関するものである。第４図は本発
明方法で用いられる第１ガラス管の肉厚の最適領
域５、および特定のコア／クラツド比における、
クラツド全体の厚み６，７を示すグラフである。
1 to 3 are diagrams showing a method of manufacturing an optical fiber by combining a core glass rod and a cladding tube. FIGS. 1 and 2 relate to the conventional method, and FIG. It is related to. FIG. 4 shows an optimum region 5 of the wall thickness of the first glass tube used in the method of the present invention and a specific core/clad ratio.
It is a graph showing the thicknesses 6 and 7 of the entire cladding.
Claims (1)
肉厚が該コア用ガラス母材棒の５〜15％である第
１の石英ガラス管に挿入し、このものを加熱溶着
して一体化し、この一体化構成体を第２の石英ガ
ラス管に挿入してロツドイン線引することを特徴
とする光フアイバの製造方法。1. Insert the GeO 2 -containing quartz glass base material rod for the core into a first quartz glass tube whose wall thickness is 5 to 15% of that of the glass base material rod for the core, and heat-weld and integrate the two. . A method of manufacturing an optical fiber, which comprises inserting this integrated structure into a second quartz glass tube and drawing the rod-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9912582A JPS58217443A (en) | 1982-06-11 | 1982-06-11 | Manufacture of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9912582A JPS58217443A (en) | 1982-06-11 | 1982-06-11 | Manufacture of optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58217443A JPS58217443A (en) | 1983-12-17 |
| JPS6124340B2 true JPS6124340B2 (en) | 1986-06-10 |
Family
ID=14239037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9912582A Granted JPS58217443A (en) | 1982-06-11 | 1982-06-11 | Manufacture of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58217443A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60151244A (en) * | 1984-01-19 | 1985-08-09 | Shin Etsu Chem Co Ltd | Manufacture of base material for optical fiber |
| JPH0825767B2 (en) * | 1990-05-25 | 1996-03-13 | ホーヤ株式会社 | Glass fiber manufacturing method |
| JP7024546B2 (en) | 2018-03-27 | 2022-02-24 | 住友電気工業株式会社 | Manufacturing method of multi-core optical fiber |
-
1982
- 1982-06-11 JP JP9912582A patent/JPS58217443A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58217443A (en) | 1983-12-17 |
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