JPS6345144A - Production of optical fiber preform - Google Patents
Production of optical fiber preformInfo
- Publication number
- JPS6345144A JPS6345144A JP18854886A JP18854886A JPS6345144A JP S6345144 A JPS6345144 A JP S6345144A JP 18854886 A JP18854886 A JP 18854886A JP 18854886 A JP18854886 A JP 18854886A JP S6345144 A JPS6345144 A JP S6345144A
- Authority
- JP
- Japan
- Prior art keywords
- preform
- refractive index
- base material
- porous glass
- optical fiber
- 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 description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000011521 glass Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 11
- 239000005373 porous glass Substances 0.000 claims abstract description 11
- 150000001805 chlorine compounds Chemical class 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 29
- 150000004706 metal oxides Chemical class 0.000 claims description 9
- 238000000151 deposition Methods 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 abstract description 3
- 229910052734 helium Inorganic materials 0.000 abstract description 3
- 150000002366 halogen compounds Chemical class 0.000 abstract description 2
- 239000001307 helium Substances 0.000 abstract description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910005534 GaO2 Inorganic materials 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 6
- 238000005253 cladding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003786 synthesis reaction 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
- C03B37/012—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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分９′ｆ）
本発明は、光ファイへ−母材の製造方法の改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application 9'f) The present invention relates to an improvement in a method for manufacturing an optical fiber base material.
（従来技術）
光ファイバー母材を製造するためコア部とクラッド部と
を有するスートプリフォームのコア部の外周面のドーパ
ントを揮発させて合成りラッドと称するクラ−２ド層を
形成する方法が知られている（特開昭５７−３４０３３
号）、この方法ではスートプリフォームを加熱炉中に入
れハロゲンガン（Ｃ１２，ＳＯＣ１２等）及び還元性ガ
ス（Ｈｅ、Ｈ，）雰囲気で約１１００℃で熱処理すると
、プリフォーム外同面に合成りラッド層が形成される。(Prior art) In order to manufacture an optical fiber preform, a method is known in which a soot preform having a core portion and a cladding portion is formed with a dopant on the outer peripheral surface of the core portion to form a cladding layer called a synthetic cladding layer. (Japanese Unexamined Patent Publication No. 57-34033)
In this method, the soot preform is placed in a heating furnace and heat-treated at approximately 1100°C in a halogen gun (C12, SOC12, etc.) and reducing gas (He, H,) atmosphere. A rad layer is formed.
しかし、この方法では合成りラッド層の厚さ及び屈折率
分布が母材の長手方向で極端に不均一である欠点があっ
た。However, this method has the drawback that the thickness and refractive index distribution of the synthetic rad layer are extremely non-uniform in the longitudinal direction of the base material.
（発明の目的）
本発明の目的は１合成りラッド層の厚さ及び屈折率分布
が長手方向に均一である光ファイバー母材の製造方法を
提供することにある。(Objective of the Invention) An object of the present invention is to provide a method for manufacturing an optical fiber preform in which the thickness and refractive index distribution of a synthetic rad layer are uniform in the longitudinal direction.
（発明の構成）
本発明の光ファイバー母材の製造方法は、熱酸化反応ま
たは加水分解反応により屈折圭制御金属酸化物を含むガ
ラス微粉末を堆積して多孔質ガラス母材を形成するに当
ってこのガラス母材の長手方向に屈折率制御用金属酸化
物の濃度を変化させ、またこのようにして形成されたガ
ラス母材をその移動方向とは逆方向に流れる塩素化合物
を含む雰囲気で熱処理しつつその先端が１０００℃以下
の温度となる位ｔから一定速度で通過させることにある
。(Structure of the Invention) The method for producing an optical fiber preform of the present invention includes forming a porous glass preform by depositing fine glass powder containing a refraction control metal oxide through a thermal oxidation reaction or a hydrolysis reaction. The concentration of the metal oxide for controlling the refractive index is varied in the longitudinal direction of this glass base material, and the glass base material thus formed is heat-treated in an atmosphere containing a chlorine compound flowing in the opposite direction to the direction of movement of the glass base material. The purpose is to allow the material to pass through the material at a constant speed from t until the temperature of its tip reaches 1000.degree. C. or less.
（実施例）
本発明の実施例を図面を参照して詳細に説明すると、第
１図は本発明の光ファイバー母材の製造方法奢示し、多
孔質ガラス母材１０は例えば多重管バーナを用いてＶＡ
Ｄ法によってガラス原料であるＳｉＯ□と屈折率制御用
金属酸化物であるＧ ｅ ０２との微粉末を堆積して形
成されるが、この場合このガラス母材１０の屈折率制御
用金属酸化物の濃度を母材１０の長手方向に変化させる
。この濃度の変化は９例えば、母材の合成途中で屈折率
制御用金属酸化物を形成すべきＧ ｅ Ｃｌ ４の温度
を下げて母材１０の長手方向のＧ ｅ Ｏ２の濃度を減
少させて行なわれる０例えば、外３６０ｍｍの多孔質ガ
ラス母材を形成する場合にＧ ｅ Ｃ１４の温度を３４
°Ｃがら途中で２９℃に下げて得ることができる。(Example) An example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a method for manufacturing an optical fiber preform of the present invention, in which a porous glass preform 10 is prepared using, for example, a multi-tube burner. V.A.
It is formed by depositing fine powder of SiO□, which is a glass raw material, and G e 02, which is a metal oxide for controlling the refractive index, by method D. In this case, the metal oxide for controlling the refractive index of the glass base material 10 The concentration of is changed in the longitudinal direction of the base material 10. This change in concentration can be achieved by, for example, reducing the concentration of G e O2 in the longitudinal direction of the base material 10 by lowering the temperature of G e Cl 4 to form the refractive index controlling metal oxide during the synthesis of the base material 10. For example, when forming a porous glass base material with an outer diameter of 360 mm, the temperature of G e C14 is set to 34 mm.
It can be obtained by lowering the temperature from °C to 29 °C.
次いで、このようにして得られた多孔質ガラス母材１０
は、第１図に示すように、加熱炉１２の処理筒１４内に
入れてこの処理筒１４内にハロゲン化合物とヘリウムと
を含むガスを母材１０の移動方向とは逆の方向に流して
熱処理しつつその先端１０ａが１０００℃以下の温度と
なる位置から一定速度で通過させる。処理筒１４内の温
度を１０００℃以下としたのは若し母材１０の先端１０
ａが１０００℃を越える位置にあると、母材１０の通過
時にその各部にかかる温度と雰囲気の組成及びその条件
下における滞留時間が変化し、ＧｅＣ１＋＋２ＳＯＣ１
。Next, the porous glass base material 10 obtained in this way
As shown in FIG. 1, a gas containing a halogen compound and helium is introduced into a processing cylinder 14 of a heating furnace 12 and flowed in a direction opposite to the moving direction of the base material 10. It is passed through at a constant speed from a position where the tip 10a reaches a temperature of 1000° C. or less while being heat-treated. The reason why the temperature inside the processing tube 14 is set to 1000°C or less is because the tip 10 of the base material 10
If a is above 1000°C, the temperature applied to each part of the base material 10, the composition of the atmosphere, and the residence time under those conditions will change, and GeC1++2SOC1
.
→ＧｅＣ１４＋２ＳＯ２によって形成される合成りラッ
ドの厚ざが長手方向で変化するからである。母材１０（
７）先端１０ａが１０００℃以下の温度となる位置から
一定速度で通過させると、母材である合成りラッドの厚
さは長手方向に均一となる。→This is because the thickness of the synthetic rad formed by GeC14+2SO2 changes in the longitudinal direction. Base material 10 (
7) When the tip 10a is passed at a constant speed from a position where the temperature is 1000° C. or less, the thickness of the synthetic rad, which is the base material, becomes uniform in the longitudinal direction.
ガラス母材１０の屈折率制御用金属酸化物の濃度を変化
させたのは熱処理されたのち９母材の屈折率が長手方向
に均一となるようにするためである。若し、熱処理前の
母材１０の屈折率制御用金属酸化物の濃度を最初から長
手方向に均一にすると、屈折率分布は長手方向に変化す
る。The reason for changing the concentration of the metal oxide for controlling the refractive index in the glass base material 10 is to make the refractive index of the glass base material 9 uniform in the longitudinal direction after being heat-treated. If the concentration of the metal oxide for refractive index control in the base material 10 before heat treatment is made uniform in the longitudinal direction from the beginning, the refractive index distribution changes in the longitudinal direction.
次に９本発明の方法の具体例をのべると、多重管バーナ
を使用してＶＡＤ法により外径６０ｍｍの多孔質ガラス
母材を形成するが１本発明ではこの場合に既にのべたよ
うにＧｅＣｌ＋の温度を３４°Ｃから途中で２９℃に下
げて母材の長手方向のＧ ｅ Ｏ２の濃度を減少させた
。これを第１図に示す装置に入れＨｅを１６リツトル／
分、５ＯＣＩ＋を０．１４リットル／分矢印で示すよう
に導入し、ガラス母材の先端を９００℃の位置まで素早
く送り込みその後２６０ｍ／分の一定速度で下降させた
。第２図は、加熱炉の温度分布を示す、このようにして
得られた光ファイバー母材は本発明では第３図及び第４
図のａで示すように厚さ及び屈折率とも長手方向に均一
であったが、ガラス母材にＧ ｅ ｏ、 ２の濃度を均
一にした場合には同図のｂで示すように屈折率は不均一
となった。9 Next, to describe a specific example of the method of the present invention, a porous glass base material with an outer diameter of 60 mm is formed by the VAD method using a multi-tube burner. The temperature was lowered from 34°C to 29°C halfway to reduce the concentration of G e O2 in the longitudinal direction of the base material. Put this into the apparatus shown in Figure 1 and add 16 liters of He/
0.14 liters/minute of 5OCI+ was introduced as shown by the arrow, and the tip of the glass base material was quickly fed to a position of 900° C., and then lowered at a constant speed of 260 m/minute. FIG. 2 shows the temperature distribution of the heating furnace.
As shown in a in the figure, both the thickness and the refractive index were uniform in the longitudinal direction, but when the concentration of G e O, 2 was made uniform in the glass base material, the refractive index changed as shown in b in the figure. became uneven.
（発明の効果）
本発明によれば、上記のように、光ファイバー母材の厚
さ及び屈折率は長手方向に均一となる実益がある。(Effects of the Invention) According to the present invention, as described above, there is a practical advantage that the thickness and refractive index of the optical fiber base material are uniform in the longitudinal direction.
第１図は本発明の方法を実施する装置の概略断面図、第
２図は加熱炉内の温度分布を示す線図、第３図及び第４
図はそれぞれ光ファイバー母材の長手方向の厚さ分布及
び屈折率分布を示す線図である。
１ｏ−−−−−ガラス母材、１２−一一−−加熱炉、
１４−−−−一処理筒。FIG. 1 is a schematic cross-sectional view of an apparatus for carrying out the method of the present invention, FIG. 2 is a diagram showing the temperature distribution in the heating furnace, and FIGS.
The figures are diagrams showing the thickness distribution and refractive index distribution in the longitudinal direction of the optical fiber preform, respectively. 1o---Glass base material, 12-11---Heating furnace,
14----One processing cylinder.
Claims (1)
酸化物を含むガラス微粉末を堆積して形成された多孔質
ガラス母材を塩素化合物を含む雰囲気中で熱処理して光
ファイバー母材を製造する方法において、前記多孔質ガ
ラス母材の長手方向に屈折率制御用金属酸化物の濃度を
変化させ、このようにして得られた多孔質ガラス母材を
その移動方向とは逆方向に流れる塩素化合物を含む雰囲
気で熱処理しつつその先端が１０００℃以下の温度とな
る位置から一定速度で通過させることを特徴とする光フ
ァイバー母材の製造方法。A method of producing an optical fiber preform by heat-treating a porous glass preform formed by depositing glass fine powder containing a metal oxide for refractive index control in an atmosphere containing a chlorine compound by thermal oxidation reaction or hydrolysis reaction. In this step, the concentration of the refractive index controlling metal oxide is varied in the longitudinal direction of the porous glass base material, and the chlorine compound flows through the porous glass base material thus obtained in a direction opposite to the direction of movement thereof. A method for producing an optical fiber preform, which comprises passing the preform at a constant speed from a position where the tip thereof reaches a temperature of 1000° C. or less while being heat-treated in an atmosphere containing the preform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18854886A JPS6345144A (en) | 1986-08-13 | 1986-08-13 | Production of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18854886A JPS6345144A (en) | 1986-08-13 | 1986-08-13 | Production of optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6345144A true JPS6345144A (en) | 1988-02-26 |
Family
ID=16225625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18854886A Pending JPS6345144A (en) | 1986-08-13 | 1986-08-13 | Production of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6345144A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02196046A (en) * | 1989-01-23 | 1990-08-02 | Hitachi Cable Ltd | Production of base material for optical fiber |
-
1986
- 1986-08-13 JP JP18854886A patent/JPS6345144A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02196046A (en) * | 1989-01-23 | 1990-08-02 | Hitachi Cable Ltd | Production of base material for optical fiber |
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