JPH02180727A - Production of optical fiber preform - Google Patents
Production of optical fiber preformInfo
- Publication number
- JPH02180727A JPH02180727A JP61589A JP61589A JPH02180727A JP H02180727 A JPH02180727 A JP H02180727A JP 61589 A JP61589 A JP 61589A JP 61589 A JP61589 A JP 61589A JP H02180727 A JPH02180727 A JP H02180727A
- Authority
- JP
- Japan
- Prior art keywords
- core
- refractive index
- optical fiber
- rod
- tubular member
- 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
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000009826 distribution Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000002844 melting Methods 0.000 claims abstract 2
- 230000008018 melting Effects 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 26
- 238000005253 cladding Methods 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 abstract description 6
- 239000010439 graphite Substances 0.000 abstract description 6
- 229910002804 graphite Inorganic materials 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 229910004014 SiF4 Inorganic materials 0.000 abstract description 2
- 239000011261 inert gas Substances 0.000 abstract description 2
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004017 vitrification Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000002019 doping agent Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 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
- C03B37/012—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]
-
- 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
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/26—Parabolic or graded index [GRIN] core profile
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は、高Ｎ＾のＧＩ型光ファイバ用母材を得るため
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a manufacturing method for obtaining a preform for a high N^ GI type optical fiber.
光ファイバ応用分野の１つにＬＡＮがある。ところで近
年の情報量の増大に伴い、ＬＡＮにおいてもその伝送速
度を大幅に向上させることが象、務になってきた。加え
てシステムの経済性を考慮して、光ファイバも高ＮＡ、
大コア径のＧＩ型光ファイバが要求されるようになって
きている。One of the optical fiber application fields is LAN. However, with the increase in the amount of information in recent years, it has become an issue to significantly improve the transmission speed of LANs. In addition, considering the economic efficiency of the system, the optical fiber is also high NA,
GI type optical fibers with large core diameters are increasingly required.
ところで光ファイバを高ＮＡ化するためには、屈折率を
増大させるドーパントであるＧｅｏｔを多量にコア部の
石英ガラスにドープさせる必要があるが、このＧｅＯ２
の含有量に比例して、コア部の線膨張係数が大きくなり
、クラッド部の石英ガラスのそれとの差が大きくなって
しまう。その結果コア部とクラッド部でミスマツチを起
こし、透明ガラス化の際に、例えば割れ易くなるといっ
た問題が生ずる。By the way, in order to increase the NA of an optical fiber, it is necessary to dope a large amount of Geot, a dopant that increases the refractive index, into the quartz glass of the core.
The linear expansion coefficient of the core portion increases in proportion to the content of silica glass, and the difference from that of the quartz glass of the cladding portion increases. As a result, a mismatch occurs between the core portion and the cladding portion, resulting in a problem that, for example, the glass becomes easily broken during transparent vitrification.
この問題を解決すべ（Ｇｅｏｇｅ、［！等は外付法（Ｏ
ＶＤ法）により第４図に示すように、コア部にＧｅｍ。This problem should be solved (George, [! etc. are external methods (O
As shown in FIG. 4, Gem was formed in the core part using VD method).
と共にＢ２０．をドープし、更にクラッド部には前記Ｂ
ｔｕｓと共にＦをドープし、第５図に示す如きＮＡＯ，
４という光ファイバを得ている。 （Ｆａｂｒｉｃａｔ
ｉｏｎｏｆ Ｏ，４ＮＡ ｆｉｂｅｒｓ ｂｙ ｏｕｔ
５ｉｄｅ ｐｒｏｃｅｓｓ ＴＩＪＧ３０ＦＣ’
８６）
この方法のポイントとなる点は、コア部にドープするＧ
ｅ０１の量を抑えて、石英ガラスとの比屈折率差Δ゛を
目的値より下げ、一方クラッド部の比屈折率差Δ−をＲ
ｉｏｔやＦをドープすることでその絶対値を大きくし、
前記Δ゛を小さくした分を補い、全体としてコア部とク
ラッド部の屈折率差Δを確保する考え方をとっている。Along with B20. The cladding part is doped with the above-mentioned B.
By doping F with tus, NAO as shown in FIG.
4 optical fiber was obtained. (Fabricat
ionof O,4NA fibers by out
5ide process TIJG30FC'
86) The key point of this method is that the G doped into the core
By suppressing the amount of e01, the relative refractive index difference Δ゛ with silica glass is lowered than the target value, while the relative refractive index difference Δ− of the cladding part is reduced to R
By doping iot or F, its absolute value is increased,
The idea is to compensate for the reduction in Δ゛ and ensure the refractive index difference Δ between the core portion and the cladding portion as a whole.
すなわち、Δ−Δ゛＋Δ−であるから、前者の絶対値を
小さくした分、後者の絶対値を大きくして、全体として
Δの値を所定値にしようという考え方である。That is, since it is Δ-Δ゛+Δ-, the idea is to increase the absolute value of the latter by an amount equal to the decrease in the absolute value of the former, so that the value of Δ as a whole is set to a predetermined value.
ところが前記方法では、コア部及びクラッド部に複数の
ドーパントを添加すること、及び画部分を一括合成する
こと、から各ドーパントの添加量制御が難しく、その結
果Δ０やΔ−の制御が非常に難しいという問題と、また
制御に失敗した場合、コア部、クラッド部が共に使用で
きなくなる等歩留りが悪いという問題もあった。更にこ
の方法を採用してもΔ−２，５％以上になると、コア部
とクラッド部の界面のところで割れが発生し易いという
問題が依然として残っている。However, in the above method, it is difficult to control the amount of each dopant added because multiple dopants are added to the core part and cladding part, and the image part is synthesized all at once, and as a result, it is very difficult to control Δ0 and Δ-. In addition, if control fails, both the core part and the cladding part become unusable, resulting in poor yield. Furthermore, even if this method is adopted, there still remains the problem that cracks are likely to occur at the interface between the core and cladding parts when Δ-2.5% or more.
前記問題に鑑み本発明の目的は、高ＨＡの６１型光ファ
イバを得るための母材を製造するに際し、その屈折率分
布の制御精度を高め、しかも効率良く製造する方法を提
供することにある。In view of the above-mentioned problems, an object of the present invention is to provide a method for increasing the control accuracy of the refractive index distribution and efficiently manufacturing a base material for obtaining a high HA 61 type optical fiber. .
前記目的を達成すべく本発明は、ＧＩ型の屈折率分布を
有する光ファイバを得るための光ファイバ用母材を製造
する方法おいて、コアの中心部分に相当する棒状部材を
、コアの周辺部分及びクラッド部分に相当する管状部材
内に挿入し、これを溶融一体化することを特徴とするも
のである。In order to achieve the above object, the present invention provides a method for manufacturing an optical fiber preform for obtaining an optical fiber having a GI type refractive index distribution. It is characterized in that it is inserted into a tubular member corresponding to the section and the cladding section, and is melted and integrated.
以下に本発明の実施例を図面を参照して詳細に説明する
。まずシリカにＧｅＯ２をドープして、第１図に示すよ
うなＧＩ型の屈折率分布を有するコア部をＶＡＤ法にて
合成し、これを加熱炉により加熱して透明ガラス化し、
コアの中心部分に相当する棒状部材を得る０次に例えば
黒鉛ロンドをターゲットにして、該黒鉛ロンド上にＯＶ
Ｄ法により、シリカにＧｅｍ＠をドープして第２図（ａ
）に示すような屈折率分布を有するコアの周辺部及びク
ラッド部分に相当する多孔質母材を作製し、これをＳｉ
Ｆ４等のフッ素化合物ガスとＨｅ等の不活性ガスを含む
雰囲気を有する加熱炉内に挿入して透明ガラス化する。Embodiments of the present invention will be described in detail below with reference to the drawings. First, silica is doped with GeO2, a core part having a GI type refractive index distribution as shown in Fig. 1 is synthesized by the VAD method, and this is heated in a heating furnace to make transparent glass.
To obtain a rod-shaped member corresponding to the central part of the core, for example, a graphite iron is targeted, and an OV is placed on the graphite iron.
By method D, silica was doped with Gem@ to form a
) A porous base material corresponding to the peripheral part and cladding part of the core having a refractive index distribution as shown in FIG.
It is inserted into a heating furnace having an atmosphere containing a fluorine compound gas such as F4 and an inert gas such as He to form transparent glass.
しかる後前記黒鉛ロンドを引き抜いて管状部材を得る。Thereafter, the graphite iron is pulled out to obtain a tubular member.
尚、該管状部材にはその半径方向に透明ガラス化の際Ｆ
がドープされ、その屈折率分布は第２図（ｂ）のように
なっている。Note that the tubular member has F in its radial direction during transparent vitrification.
is doped, and its refractive index distribution is as shown in FIG. 2(b).
このようにコアの中心部分に相当する棒状部材と、コア
の周辺部分及びクラッド部分に相当する管状部材を各々
作製したら、公知のロンドインチューブ法を利用して、
後者の管状部材中に前者の棒状部材を挿入し、これを溶
融一体化し、全体として第３図に示すような屈折率分布
を有する光ファイバ用母材を得る。′尚、従来からコア
部全体に相当する棒状部材をクラッド部に相当する管状
部材中に挿入し、これを溶融一体化する方法が公知であ
るが、この従来法では管状部材にＦをドープすると、コ
ア部の最外部の屈折率とクラッド部の屈折率との間に急
激な屈折率段差ができ、伝送上、例えば帯域が制限を受
ける等の問題になってしまう、これに対して本願のよう
に管状部材にコア部周辺部分とクラッド部とを含ませる
と、前述のような伝送特性への影響を少なくできるとい
う利点がある。After producing the rod-like member corresponding to the central part of the core and the tubular member corresponding to the peripheral part and cladding part of the core, using the known Rondo-in-tube method,
The former rod-like member is inserted into the latter tubular member and melted and integrated to obtain an optical fiber preform having a refractive index distribution as shown in FIG. 3 as a whole. 'In addition, there is a conventionally known method in which a rod-shaped member corresponding to the entire core part is inserted into a tubular member corresponding to the cladding part and then melted and integrated. However, in this conventional method, when the tubular member is doped with F, , a sharp refractive index step occurs between the refractive index of the outermost part of the core part and the refractive index of the cladding part, which causes problems in transmission, such as limiting the band. When the tubular member includes the peripheral portion of the core portion and the cladding portion, there is an advantage that the above-mentioned influence on the transmission characteristics can be reduced.
以下に本発明の具体例及び比較例を示す。Specific examples and comparative examples of the present invention are shown below.
ＧＩ型で屈折率分布係数α＝２で、Δ０が２．２％にな
るようにＧａｎｇをドープした多孔質母材をＶＡＤ法に
て作製し、該多孔質母材を１３５０″Ｃ１Ｈｅ雰囲気の
加熱炉中にゆっくり挿入し、透明ガラス化せしめた。こ
れを必要に応じて延伸し第１図に示すような屈折率分布
を有する棒状部材を得た。A porous base material of GI type doped with Gang so that the refractive index distribution coefficient α=2 and Δ0 is 2.2% was prepared by the VAD method, and the porous base material was heated to 1350″ in a C1He atmosphere. The material was slowly inserted into a furnace and turned into transparent vitrification.This was stretched as necessary to obtain a rod-shaped member having a refractive index distribution as shown in FIG.
次にＯｖＯ法により、外径２２ｖｗの黒鉛ロンド上にα
＝２になるようにＧｅＯ１濃度を制御してコアの周辺部
に相当する多孔質体を堆積せしめ、続いて前記Ｇｅ０ｔ
をドープせずに純粋シリカのみを堆積せしめ、クランド
部に相当する多孔質体を形成し、その屈折率分布が第２
図（ａ）に相当する多孔質母材を得た。クラッド部の堆
積が完了したら、この多孔質母材全体をＳｉＦ４及びＨ
ｅを含む雰囲気を有し、その最高温度部が１３００°Ｃ
である加熱炉にゆっくり挿入し、透明ガラス化及びＦド
ープを図る。透明ガラス化後これを冷却し室温に達した
ところで前記黒鉛ロンドを引き抜いて内径２２ｍ＋＊、
外径３７＋ａｍでその屈折率分布が第２図（ｂ）に示す
管状部材を得た０次に前記棒状部材の表面を火炎研磨し
た後、これを前記管状部材内に挿入し、公知のロンドイ
ンチューブ法を用いて、例えば一方の端から他端に向け
て順次酸水素バーナで加熱して全体をコラプスせしめる
。Next, by the OvO method, α
A porous material corresponding to the peripheral part of the core was deposited by controlling the GeO1 concentration so that the GeO1 concentration was 2, and then the GeOt
By depositing only pure silica without doping, a porous body corresponding to the crund part is formed, and its refractive index distribution is
A porous base material corresponding to Figure (a) was obtained. Once the cladding has been deposited, the entire porous matrix is coated with SiF4 and H
It has an atmosphere containing e, and its maximum temperature is 1300°C.
The sample was slowly inserted into a heating furnace to achieve transparent vitrification and F doping. After turning it into transparent vitrification, it was cooled and when it reached room temperature, the graphite rond was pulled out and had an inner diameter of 22 m+*.
A tubular member with an outer diameter of 37+am and a refractive index distribution as shown in FIG. Using the tube method, for example, the entire structure is collapsed by successively heating it with an oxyhydrogen burner from one end to the other.
このようにして得られた母材の屈折率分布は第３図のよ
うになっていて、α−２、Δ＝３％、コア／クラッド＝
１３／２５で、その内部に全く気泡等の欠陥のないも
のが得られた。尚、この方法でサンプル数ｎ−１５の母
材を製造したが、いづれの場合も母材が割れたり、内部
に気泡が入る等のトラブルは起こらなかった。The refractive index distribution of the base material obtained in this way is as shown in Figure 3, α-2, Δ = 3%, core/cladding =
At 13/25, a product with no defects such as bubbles inside was obtained. Incidentally, a sample number n-15 of base materials was produced using this method, and in none of the cases were problems such as cracking of the base materials or air bubbles entering inside the base materials.
また屈折率差Δのばらつきも棒状部材により製造される
コア部のそれの場合、Δ＝２．２±０．２％、管状部材
により製造される部分に相当するΔは、Δ＝０．８±０
．０５％と極めて制御精度が良かった。In addition, the variation in the refractive index difference Δ is Δ=2.2±0.2% in the case of the core part manufactured by a rod-shaped member, and Δ=0.8% corresponding to the part manufactured by a tubular member. ±0
．． The control accuracy was extremely good at 0.05%.
またその結果である全体のΔも、Δ−３±０．０６％と
非常に良好であった。Further, the overall Δ as a result was also very good at Δ−3±0.06%.
前述したＧｅｏｇｅ、Ｅ等の文献に基づき、ｏｖｏ法に
て一括して前述の具体例に相当するＧＩ型の光ファイバ
用母材を合成した。このときのΔ・及びΔ−の各目標値
はΔ”−２，２％、Δ−＝０．８％である。Based on the above-mentioned literature by George, E., etc., a GI-type optical fiber base material corresponding to the above-mentioned example was synthesized in one batch by the ovo method. At this time, the respective target values of Δ· and Δ− are Δ”−2.2% and Δ−=0.8%.
またコアの周辺部からクラッド部にかけてはＢ、０゜も
ドープした。Further, from the peripheral part of the core to the cladding part, B was also doped at 0°.
サンプル数ｎ−１０を評価したところ、母材全体の屈折
率差Δのばらつきは、Δ＝３±０．２％と前記本発明の
方法により得たものと比較して大幅に大きかった。また
、これら１０本の母材中、そのうち２本は透明ガラス化
中に割れてしまった。When the number of samples n-10 was evaluated, the variation in the refractive index difference Δ of the entire base material was Δ=3±0.2%, which was significantly larger than that obtained by the method of the present invention. Furthermore, among these 10 base materials, 2 of them broke during the process of transparent vitrification.
以上のように本発明によれば、母材を棒状部材と管状部
材に分け、各々を別工程で製造するため、屈折率分布制
御精度の良いＧＩ型高ＮＡ光ファイバ母材を容易に得る
ことができる。また棒状部材と管状部材の界面をコア部
内に設けたことにより、この界面の両側の線膨張係数差
は小さく、その結果１！！に一体化が容易であるという
利点もある。As described above, according to the present invention, the base material is divided into a rod-shaped member and a tubular member, and each is manufactured in a separate process, so that it is possible to easily obtain a GI type high NA optical fiber base material with good refractive index distribution control accuracy. Can be done. Furthermore, by providing the interface between the rod-shaped member and the tubular member within the core, the difference in linear expansion coefficient on both sides of this interface is small, resulting in a difference of 1! ! It also has the advantage of being easy to integrate.
尚、前記実施例では、ドーパントとしてＧｅＯ□、Ｆに
ついてのみ述べたが、この他Ｂ！０１、ＡＩ！０３やＴ
ｉＯｘ等のドーパントも使用できる。また棒状部材、管
状部材の製法もＶＡＤ法、ＯＶＤ法に限らず、例えば内
付法であるＭＣＶＤ法も適用できる。In the above embodiment, only GeO□ and F were described as dopants, but in addition, B! 01, AI! 03 and T
Dopants such as iOx can also be used. Further, the manufacturing method of the rod-shaped member and the tubular member is not limited to the VAD method or the OVD method, but also the MCVD method, which is an internal attachment method, can also be applied.
前述の如く本発明によれば、コアの中心部と、コアの周
辺部及びクラッド部分とを各々別々に作製するため、屈
折率分布の制御がやり易く、またそれ故に歩留りを向上
させることができる。加えて各々を別々に作製するため
Δ゛、Δ−の選択自由度が広がり、任意のΔのものを製
造できるという利点もある。As described above, according to the present invention, since the central portion of the core, the peripheral portion of the core, and the cladding portion are each manufactured separately, it is easy to control the refractive index distribution, and therefore the yield can be improved. . In addition, since each is manufactured separately, there is a greater degree of freedom in selecting Δ゛ and Δ-, and there is an advantage that one having an arbitrary Δ can be manufactured.
第１図は本発明で使用する棒状部材の屈折率分布を示す
図、第２図（ａ）、（ｂ）は各々本発明で使用する管状
部材の透明ガラス化前の屈折率分布及び透明ガラス後の
屈折率分布を示す図、第３図は本発明により得られた光
ファイバの屈折率分布を示す図、第４図は従来法による
光ファイバ母材のドーパント濃度分布を示す図、第５図
はＧｉ型光ファイバの屈折率分布を示す図である°。Figure 1 is a diagram showing the refractive index distribution of the rod-shaped member used in the present invention, and Figures 2 (a) and (b) are the refractive index distribution of the tubular member used in the present invention before transparent vitrification and the transparent glass, respectively. 3 is a diagram showing the refractive index distribution of the optical fiber obtained by the present invention. FIG. 4 is a diagram showing the dopant concentration distribution of the optical fiber base material obtained by the conventional method. The figure is a diagram showing the refractive index distribution of a Gi-type optical fiber.
Claims (1)
ファイバ用母材を製造する方法おいて、コアの中心部分
に相当する棒状部材を、コアの周辺部分及びクラッド部
分に相当する管状部材内に挿入し、これを溶融一体化す
ることを特徴とする光ファイバ用母材の製造方法。In a method for manufacturing an optical fiber preform for obtaining an optical fiber having a GI-type refractive index distribution, a rod-shaped member corresponding to the central portion of the core is inserted into a tubular member corresponding to the peripheral portion and cladding portion of the core. 1. A method for manufacturing an optical fiber base material, which comprises inserting the fiber into a base material and melting and integrating the fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61589A JPH02180727A (en) | 1989-01-05 | 1989-01-05 | Production of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61589A JPH02180727A (en) | 1989-01-05 | 1989-01-05 | Production of optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02180727A true JPH02180727A (en) | 1990-07-13 |
Family
ID=11478637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61589A Pending JPH02180727A (en) | 1989-01-05 | 1989-01-05 | Production of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02180727A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915064A1 (en) * | 1997-10-29 | 1999-05-12 | Corning Incorporated | Method of making segmented core optical waveguide preforms |
| WO1999040037A1 (en) * | 1998-02-03 | 1999-08-12 | Sumitomo Electric Industries, Ltd. | Method of manufacturing optical fiber base material |
-
1989
- 1989-01-05 JP JP61589A patent/JPH02180727A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915064A1 (en) * | 1997-10-29 | 1999-05-12 | Corning Incorporated | Method of making segmented core optical waveguide preforms |
| WO1999040037A1 (en) * | 1998-02-03 | 1999-08-12 | Sumitomo Electric Industries, Ltd. | Method of manufacturing optical fiber base material |
| US6474108B2 (en) * | 1998-02-03 | 2002-11-05 | Sumitomo Electric Industries, Ltd. | Fiber preform method with a hot drill-in step for a Ge-doped tube and an F-doped rod |
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