JPH0522656B2 - - Google Patents
Info
- Publication number
- JPH0522656B2 JPH0522656B2 JP16381384A JP16381384A JPH0522656B2 JP H0522656 B2 JPH0522656 B2 JP H0522656B2 JP 16381384 A JP16381384 A JP 16381384A JP 16381384 A JP16381384 A JP 16381384A JP H0522656 B2 JPH0522656 B2 JP H0522656B2
- Authority
- JP
- Japan
- Prior art keywords
- base material
- core
- transparent
- optical fiber
- cladding
- 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 - Lifetime
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]
- C03B37/016—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] by a liquid phase reaction process, e.g. through a gel phase
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
〔技術分野〕
本発明は、石英ガラス管を必要とせず、量産的
にクラツド部の全てを合成可能とする光フアイバ
用母材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 method for manufacturing an optical fiber base material that does not require a quartz glass tube and allows the entire cladding portion to be synthesized in mass production.
光フアイバ用母材の製造方法としては従来から
種々のものが提案され、実用に供せられている。
中でもVAD法（気相軸付け法）は高品質な母材
を量産的に製造できるものとして広く用いられて
いる手法の一つである。VAD法ではコア用バー
ナにより、コアとなるべき多孔質母材を合成し、
これを透明ガラス化する工程と、この透明ガラス
化した母材（コアのみ）を適当な大きさに延伸
し、石英ガラス管に封入した後、溶着一体化する
工程とが通常用いられている。この場合石英ガラ
ス管が光フアイバのクラツド部分に相当する事に
なる。VAD法では、コア用バーナと同時にクラ
ツド用バーナを用い、コア、クラツドを一度に合
成する事も可能ではあるが、多孔質母材を安定に
成長させる事が難しく現在では、前記の様に、石
英ガラス管を用いる手段が一般的に行われてい
る。
Various methods for manufacturing optical fiber base materials have been proposed and put into practical use.
Among them, the VAD method (vapor phase axial deposition method) is one of the widely used methods for mass-producing high-quality base materials. In the VAD method, a core burner is used to synthesize the porous base material that will become the core.
A process of converting this into transparent glass, and a process of stretching this transparent vitrified base material (core only) to an appropriate size, enclosing it in a quartz glass tube, and then welding and integrating it are commonly used. In this case, the quartz glass tube corresponds to the cladding portion of the optical fiber. In the VAD method, it is possible to synthesize the core and cladding at the same time by using a burner for the cladding at the same time as a burner for the core, but it is currently difficult to grow the porous base material stably, as mentioned above. A commonly used method is to use a quartz glass tube.
ところが、石英ガラス管は水晶を原材料として
いるため、資源経済性の面で大きな問題があり、
又、天然水晶中に含まれる不純物（特に希工類元
素）が光フアイバ中にまで残在し、機械的強度の
低下を起す欠点もあつた。 However, since quartz glass tubes use crystal as a raw material, there are major problems in terms of resource economy.
In addition, impurities (particularly rare elements) contained in natural quartz remain in the optical fiber, resulting in a reduction in mechanical strength.
さらにまた、石英ガラス管中に延伸した透明母
材を挿入する際、管壁及び、母材表面に傷が発生
し、散乱損失の増大を引き起す問題もあつた。こ
のため、使用可能な石英ガラス管は極めて高精度
寸法のもののみでありさらに経済性を悪くしてい
た。 Furthermore, when inserting the stretched transparent base material into the quartz glass tube, there was a problem in that scratches were generated on the tube wall and the surface of the base material, causing an increase in scattering loss. For this reason, the only quartz glass tubes that can be used are those with extremely high precision dimensions, further worsening economic efficiency.
そこで、本発明の目的は、上述したような欠点
を排除すべく、石英ガラス管を用いることなく光
フアイバを製造するための光フアイバクラツド用
ガラスの製造方法を提供することにある。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing optical fiber glass for manufacturing optical fiber without using a quartz glass tube, in order to eliminate the above-mentioned drawbacks.
かかる目的を達成するために、本発明では、ク
ラツド部の石英ガラスをコアとなるべき母材表面
に直接合成する。
In order to achieve this object, in the present invention, the quartz glass of the cladding portion is directly synthesized on the surface of the base material that is to become the core.
すなわち、本発明は、光フアイバのコアとなる
べき棒状透明母材を、シリコンアルコレートまた
はヒユームドシリカ中に浸したまま、シリコンア
ルコレートまたはヒユームドシリカを乾燥させ、
多孔質状クラツド部を透明母材の周辺に付着させ
た後に、熱処理して透明クラツド部とすることを
特徴とするものである。 That is, the present invention involves drying silicon alcoholate or fumed silica while a rod-shaped transparent base material to be the core of the optical fiber is immersed in silicon alcoholate or fumed silica,
This method is characterized in that after a porous cladding part is attached to the periphery of a transparent base material, it is heat-treated to form a transparent cladding part.
以下に図面を参照して本発明を説明する。 The present invention will be explained below with reference to the drawings.
実施例 １
第１図は本発明の一実施例を示し、ここで１は
コア用透明母材、２は容器、３は原料である。Example 1 FIG. 1 shows an example of the present invention, where 1 is a transparent base material for a core, 2 is a container, and 3 is a raw material.
コア用透明母材１はVAD法で合成したもので
あり、直径20mm、長さ500mmの寸法である。容器
２中に入つている原料３は、Si（C2H5O）4をアル
コールに溶かしたものに適量の水分を加えたもの
を用いた。母材１は容器２中で垂直な位置に保持
したまま、110℃まで徐々に昇温させた。昇温に
伴い加水分解反応も進行し、原料３はゾルからゲ
ルへさらに乾燥（多孔質状）ゲルの状態に変化し
た。この段階で容器内の原料は体積が減少するた
めに容器壁からはなれる。容器を除去した後、こ
れを1300℃のHe＋Cl2雰囲気中で熱処理しコアと
クラツドから成る透明な光フアイバ用母材（直径
50mm、長さ500mm）を得た。 The transparent base material 1 for the core was synthesized by the VAD method, and has dimensions of 20 mm in diameter and 500 mm in length. The raw material 3 contained in the container 2 was prepared by adding an appropriate amount of water to a solution of Si(C 2 H 5 O) 4 in alcohol. While the base material 1 was held in a vertical position in the container 2, the temperature was gradually raised to 110°C. As the temperature increased, the hydrolysis reaction progressed, and the raw material 3 changed from a sol to a gel and further to a dry (porous) gel. At this stage, the raw material inside the container is released from the container wall due to its volume reduction. After removing the container, it is heat-treated in a He + Cl 2 atmosphere at 1300°C to form a transparent optical fiber base material (diameter
50mm, length 500mm).
長さ方向の寸法は熱処理時の応力の影響によ
り、幾分縮小する事もあつた。 The lengthwise dimension sometimes decreased somewhat due to the effects of stress during heat treatment.
実施例 ２
第２図に示す様な容器を用いれば複数本のコア
母材に同時にクラツドをつける事ができるため量
産効果は大きく上る。原料は、本実施例でアルコ
レートを用いているが、これをヒユームドシリカ
（SiO2微粒子）を用いた場合にも乾燥条件等を変
えるだけで同様に、透明な母材（コア、クラツド
付き）を得る事ができた。ここでヒユームドシリ
カ（fumed silica）とは、一般に気相法で製造さ
れる粒径の非常に小さな（10〜50ｍμ程度）
SiO2系微粒子であつて、水やアルコール等にコ
ロイド粒子として、分散させたものが市販されて
いる。本発明のための高純度で粒径の揃つたヒユ
ームドシリカは、SiCl4を原料として、酸水素炎
中でH2，O2量、原料供給量を最適にすることに
より得られたものである。Embodiment 2 If a container such as the one shown in FIG. 2 is used, cladding can be applied to a plurality of core base materials at the same time, which greatly increases the effectiveness of mass production. Although alcoholate is used as the raw material in this example, if fumed silica (SiO 2 fine particles) is used, a transparent base material (with core and cladding) can be produced in the same way by simply changing the drying conditions etc. I was able to get it. Here, fumed silica is a very small particle size (about 10 to 50 mμ) that is generally produced by a gas phase method.
SiO 2 -based fine particles are commercially available as colloidal particles dispersed in water, alcohol, etc. The fumed silica with high purity and uniform particle size for use in the present invention is obtained by using SiCl 4 as a raw material and optimizing the amounts of H 2 and O 2 and the amount of raw material supplied in an oxyhydrogen flame.
実施例 ３
実施例１，２ではコア用母材を夫々１本のみ原
料中に浸したが、これを第３図に示す様に、複数
本所望の位置関係に配列して同時に浸しても良
い。実際には原料３としてヒユームドシリカを用
い、５本の透明母材を横一列に並べ同時にクラツ
ド部を合成した。この場合、容器２としては長方
形断面のものを用いた。透明ガラス化した後５本
のコア用母材は概して直方体に近い透明ガラス
（クラツド）中に埋つた状態になつていた。Example 3 In Examples 1 and 2, only one core base material was immersed in the raw material, but as shown in Fig. 3, multiple core base materials may be arranged in a desired positional relationship and immersed at the same time. . Actually, fumed silica was used as the raw material 3, and five transparent base materials were arranged horizontally in a row to synthesize the clad part at the same time. In this case, the container 2 used had a rectangular cross section. After being made into transparent vitrification, the five core base materials were buried in transparent glass (crud), which was generally rectangular parallelepiped.
ここまでの説明で明らかなように、コアとなる
べき棒状透明母材はVAD法で作成されたものに
限定する必要はなく、フアイバの使用目的に応じ
て適当なものを選定することができる。 As is clear from the above explanation, it is not necessary to limit the rod-shaped transparent base material to be the core to that made by the VAD method, and an appropriate material can be selected depending on the intended use of the fiber.
以上説明したように、本発明によれば、VAD
法で、コア部分に相当する透明母材のみを製造
し、クラツド部は別工程で合成することが可能と
なり、石英管を使用する必要がなくなるため、経
済性、資源、品質などの点で大きな利点がある。
As explained above, according to the present invention, VAD
With this method, only the transparent base material corresponding to the core part can be manufactured, and the clad part can be synthesized in a separate process, eliminating the need to use quartz tubes, which is a huge improvement in terms of economy, resources, quality, etc. There are advantages.
第１図は本発明による一実施例の概略を示す斜
視図、第２図は本発明の他の実施例の概略を示す
斜視図、第３図は本発明のさらに他の実施例の概
略を示す斜視図である。
１…コア用透明母材、２…容器、３…原料。
FIG. 1 is a perspective view showing an outline of one embodiment of the present invention, FIG. 2 is a perspective view showing an outline of another embodiment of the invention, and FIG. 3 is a perspective view showing an outline of still another embodiment of the invention. FIG. 1... Transparent base material for core, 2... Container, 3... Raw material.
Claims (1)
を、シリコンアルコレートまたはヒユームドシリ
カ中に浸したまま、前記シリコンアルコレートま
たはヒユームドシリカを乾燥させ、多孔質状クラ
ツド部を前記透明母材の周辺に付着させた後に、
熱処理して透明クラツド部とすることを特徴とす
る光フアイバクラツド用ガラスの製造方法。1. While the rod-shaped transparent base material to be the core of the optical fiber is immersed in silicon alcoholate or fumed silica, the silicon alcoholate or fumed silica is dried, and a porous cladding portion is attached around the transparent base material. After that,
A method for producing glass for optical fiber cladding, which comprises heat-treating the glass to form a transparent cladding part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16381384A JPS6172639A (en) | 1984-08-06 | 1984-08-06 | Manufacture of glass for optical fiber clad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16381384A JPS6172639A (en) | 1984-08-06 | 1984-08-06 | Manufacture of glass for optical fiber clad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6172639A JPS6172639A (en) | 1986-04-14 |
| JPH0522656B2 true JPH0522656B2 (en) | 1993-03-30 |
Family
ID=15781200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16381384A Granted JPS6172639A (en) | 1984-08-06 | 1984-08-06 | Manufacture of glass for optical fiber clad |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6172639A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITNO990004A1 (en) * | 1999-03-08 | 2000-09-08 | Gel Design And Engineering S R | SOL-GEL PROCESS FOR THE PRODUCTION OF CONTAINING AND ADERENTIAD ARTICLES AND AN INCOMPRESSABLE CYLINDRICAL INSERT AND MANUFACTURES SO OBTAINED. |
-
1984
- 1984-08-06 JP JP16381384A patent/JPS6172639A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6172639A (en) | 1986-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |