JPS62187127A - Production of optical fiber base material - Google Patents
Production of optical fiber base materialInfo
- Publication number
- JPS62187127A JPS62187127A JP2736886A JP2736886A JPS62187127A JP S62187127 A JPS62187127 A JP S62187127A JP 2736886 A JP2736886 A JP 2736886A JP 2736886 A JP2736886 A JP 2736886A JP S62187127 A JPS62187127 A JP S62187127A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- oxygen
- base material
- quartz glass
- fiber base
- 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 36
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000000463 material Substances 0.000 title abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 32
- 239000001301 oxygen Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000011521 glass Substances 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000010453 quartz Substances 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000008246 gaseous mixture Substances 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000005491 wire drawing Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 6
- 235000012239 silicon dioxide Nutrition 0.000 description 6
- 238000004017 vitrification Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000011859 microparticle Substances 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal 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)
Abstract
Description
【発明の詳細な説明】
１１ユｐＢ月分！
本発明は、光ファイバ母材の製造方法に関するものであ
り、更に詳述するならば、伝送損失の小さい石英系ガラ
ス光ファイバ母材の製造方法に関するものである。[Detailed description of the invention] 11 YupB months! The present invention relates to a method of manufacturing an optical fiber preform, and more specifically, to a method of manufacturing a silica-based glass optical fiber preform with low transmission loss.
従来の技術
従来の石英系ガラス光ファイバ母材の製造方法では、Ｈ
ｅなどの不活性雰囲気中あるいは酸素分圧が２０％以下
の混合ガス雰囲気中で加熱を行い、石英系ガラス微粒子
の焼結体である多孔質体を透明ガラス化させていた。Conventional technology In the conventional manufacturing method of silica-based glass optical fiber preform, H
The porous body, which is a sintered body of quartz-based glass particles, was turned into transparent vitrification by heating in an inert atmosphere such as E or a mixed gas atmosphere with an oxygen partial pressure of 20% or less.
この方法によると、石英ガラス微粒子中の３１０２ある
いはＧｅＱ２から酸素が雰囲気中に脱は出しやすいため
、線引きした光ファイバには酸素空孔による欠陥、すな
わちＥ°センタが形成されやすかった。According to this method, oxygen is easily released into the atmosphere from 3102 or GeQ2 in the silica glass particles, so that defects due to oxygen vacancies, that is, E° centers, are likely to be formed in the drawn optical fiber.
特に、耐γ線用の純石英ガラスをコアとする光ファイバ
では、２１０ｎｍの光波長でＥ”センタによる吸収損失
を生じるので、その損失を回避するためにＯＨ基を多く
含む石英ガラスを用いてきた。In particular, in optical fibers whose core is made of pure silica glass for gamma ray resistance, absorption loss occurs due to the E" center at a light wavelength of 210 nm. To avoid this loss, silica glass containing a large amount of OH groups is used. Ta.
しかし、これらＯＨ基を含む光ファイバでは９５０ｎｍ
及び１３９０ｎｍの光波長でＯＨ基による大きな吸収損
失を生じるという問題があった。However, optical fibers containing these OH groups have a wavelength of 950 nm.
There was a problem in that a large absorption loss due to the OH group occurred at a light wavelength of 1390 nm.
発明が解決しようとする問題点
従来の光ファイバ母材の製造方法においては、製造され
た光ファイバ母材を線引きする際に酸素空孔による欠陥
が形成されやすく、これを原因とする紫外域での光吸収
によって光ファイバの伝送損失が大きくなるという問題
があった。Problems to be Solved by the Invention In the conventional manufacturing method of optical fiber preforms, defects due to oxygen vacancies are likely to be formed when the manufactured optical fiber preforms are drawn, and this causes defects in the ultraviolet region. There has been a problem in that optical fiber transmission loss increases due to light absorption.
そこで、本発明は、上記酸素空孔による欠陥を除去して
紫外域での光吸収を低減して伝送損失の小さい光ファイ
バの母材の製造方法を提供せんとするものである。SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a method for manufacturing an optical fiber base material with low transmission loss by removing the defects caused by oxygen vacancies and reducing light absorption in the ultraviolet region.
問題点を解決するための手段
すなわち、本発明によるならば、石英系ガラス微粒子の
焼結体である多孔質体を形成し、該多孔質体を加熱して
透明ガラスとする光ファイバ母材の製造方法において、
上記石英系ガラス多孔質体を、酸素分圧が３０％以上の
酸素と不活性ガスとの混合ガス流中で加熱して透明ガラ
スとすることを特徴とする光ファイバ母材の製造方法が
提供される。Means for solving the problem, that is, according to the present invention, a porous body which is a sintered body of silica-based glass particles is formed, and the porous body is heated to form a transparent glass of an optical fiber base material. In the manufacturing method, the above-mentioned silica-based glass porous body is heated in a mixed gas flow of oxygen and inert gas having an oxygen partial pressure of 30% or more to obtain a transparent glass. A manufacturing method is provided.
本発明の好ましい態様に従う光ファイバ母材の製造方法
は、上記不活性ガスとして、Ｈｅを用いて実施される。The method for manufacturing an optical fiber preform according to a preferred embodiment of the present invention is carried out using He as the inert gas.
詐月
従来の技術による石英ガラス多孔質体をガラス化させる
光ファイバ母材の製造方法にふいては、Ｈｅなどの不活
性雰囲気中あるいは酸素分圧が２０％以下の雰囲気中で
、加熱を行っていた。In the conventional method for producing an optical fiber base material by vitrifying a porous silica glass material, heating is performed in an inert atmosphere such as He or in an atmosphere with an oxygen partial pressure of 20% or less. was.
本発明の方法によれば、石英系ガラス微粒子の焼結体で
ある多孔質体を形成し、酸素分圧が３０％以上の酸素と
不活性ガスとの混合ガス、例えば酸素とＨｅの混合ガス
流中で、より好ましくは上記酸素と加熱源との反応を防
止する手段を講じて、上記多孔質体を所要の温度に加熱
して透明ガラスすなわち光ファイバ母材を製造する。According to the method of the present invention, a porous body which is a sintered body of silica-based glass particles is formed, and a mixed gas of oxygen and an inert gas having an oxygen partial pressure of 30% or more, such as a mixed gas of oxygen and He, is used. In the flow, the porous body is heated to a required temperature, preferably by taking measures to prevent the reaction between the oxygen and the heating source, to produce transparent glass, that is, an optical fiber preform.
従って、雰囲気の酸素分圧が従来より高いため石英ガラ
ス微粒子中のＳｉＯ□あるいはＧｅ０ｚから酸素が雰囲
気中に脱は出しにくく、光ファイバ母材を線引きする際
、光ファイバには酸素空孔による欠陥は形成されにくく
なる。これに伴い、上記酸素空孔に起因する紫外域での
光吸収損失が減少し、伝送特性が大きく改善される。Therefore, since the oxygen partial pressure in the atmosphere is higher than before, it is difficult for oxygen to escape from SiO□ or Ge0z in the silica glass particles into the atmosphere, and when the optical fiber base material is drawn, the optical fiber has defects due to oxygen vacancies. are less likely to form. Accordingly, the optical absorption loss in the ultraviolet region caused by the oxygen vacancies is reduced, and the transmission characteristics are greatly improved.
以下、本発明の方法を実施例により説明するが、これら
の実施例は本発明の範囲を何ら制限するものではない。Hereinafter, the method of the present invention will be explained using Examples, but these Examples are not intended to limit the scope of the present invention in any way.
ヌ１５
本発明による光ファイバ母材の製造方法の実施例の具体
的な説明に先立ち、本発明の方法を実施するのに用いる
装置の構成を第１図に示す。15 Prior to a detailed description of an embodiment of the method for manufacturing an optical fiber preform according to the present invention, the configuration of an apparatus used to carry out the method of the present invention is shown in FIG.
第１図の装置において、石英ガラス炉心管２は下端に酸
素とＨｅの混合ガスを管内に流入するためのガス流入部
を、上方側部に上記混合ガスを排出するための排出部を
有する。In the apparatus shown in FIG. 1, a quartz glass furnace tube 2 has a gas inlet at its lower end for introducing a mixed gas of oxygen and He into the tube, and an outlet at its upper side for discharging the mixed gas.
石英ガラス炉心管２の上端を貫通する石英支持棒１は、
その下端に石英ガラス微粒子多孔質体３を支持する。石
英ガラス炉心管２の外側には石英ガラス微粒子多孔質体
を加熱するカーボン・ヒータ４が備えられている。The quartz support rod 1 passing through the upper end of the quartz glass furnace tube 2 is
A silica glass fine particle porous body 3 is supported at its lower end. A carbon heater 4 is provided outside the quartz glass furnace tube 2 to heat the quartz glass fine particle porous body.
第１図の装置を用いて、酸素とＨｅを混合して流入部か
ら炉内に流し、直径４０ｍｍの純石英ガラス微粒子多孔
質体を１５５０℃に加熱して、ガラス化した。Using the apparatus shown in FIG. 1, oxygen and He were mixed and flowed into the furnace from the inlet, and a pure silica glass microparticle porous body with a diameter of 40 mm was heated to 1550° C. to vitrify it.
Ｈｅの流量は４１７分で固定しておき、酸素流量を０．
２．４１７分の３水準とした。また、脱水のために、い
ずれの場合もＣＩ２を５０ｃｃ ７分で流した。石英ガ
ラス炉心管はカーボンヒータと酸素との反応を防止する
ために必要である。The He flow rate was fixed at 417 minutes, and the oxygen flow rate was set to 0.
The level was set at 3/2.417. In addition, for dehydration, CI2 was flowed at 50 cc for 7 minutes in each case. The quartz glass furnace tube is necessary to prevent reaction between the carbon heater and oxygen.
以上のように透明ガラス化を実施した結果、いずれの場
合も透明な純石英ガラス母材が得られた。As a result of carrying out transparent vitrification as described above, a transparent pure silica glass base material was obtained in all cases.
得られた３本の透明ガラス母材を同一条件で線引きし、
成形された各光ファイバについてＥＳＲ測定を室温で行
った。その結果を第２図に示す。The three transparent glass base materials obtained were drawn under the same conditions,
ESR measurements were performed on each molded optical fiber at room temperature. The results are shown in FIG.
酸素を含まないガラス化雰囲気中で製造した母材から線
引きした光ファイバでは、線引きの際形成されたＥ゛セ
ンタ顕著に観測された。ガラス化雰囲気中の酸素の量が
増加するにつれ、Ｅ°センタ滑は減少し、酸素流Ｍｌ！
／分ではＥ”センタがほとんど観測されなかった。In an optical fiber drawn from a base material manufactured in an oxygen-free vitrification atmosphere, an E center formed during drawing was clearly observed. As the amount of oxygen in the vitrification atmosphere increases, the E° center slip decreases and the oxygen flow Ml!
/min, the E” center was hardly observed.
以上の結果から明らかなように、本発明によれば、従来
技術に比してＥ′センタの量が減少し、それに付随する
紫外域での光吸収が少なくなる。As is clear from the above results, according to the present invention, the amount of E' centers is reduced compared to the prior art, and the accompanying light absorption in the ultraviolet region is reduced.
上記の３本の光ファイバにγ線照射（照射量２Ｘ １０
５ｒａｄ ）を行った。８５０ｎｍの光波長における伝
送損失の増加量ΔＬを第１表に示す。第１表から明らか
なように酸素分圧の高い雰囲気中でガラス化した母材の
光ファイバはど耐放射線性も優れている。Irradiation of gamma rays to the above three optical fibers (irradiation amount 2X 10
5rad) was performed. Table 1 shows the amount of increase ΔL in transmission loss at an optical wavelength of 850 nm. As is clear from Table 1, optical fibers whose base material is vitrified in an atmosphere with a high oxygen partial pressure have excellent radiation resistance.
名コｐ皇】
以上の説明から明らかなように、本発明による光ファイ
バ母材作製方法によれば、作製された光ファイバ母材を
線引きする際光ファイバ中に形成される酸素空孔欠陥を
減少させることができ、紫外域での伝送損失が小さく、
耐放射線特性にすぐれた光ファイバを得ることができる
。従って、本発明による光ファイバ母材の製造方法は、
広い範囲にわたって活用することができる。As is clear from the above explanation, according to the method for producing an optical fiber preform according to the present invention, oxygen vacancy defects formed in the optical fiber are eliminated when the produced optical fiber preform is drawn. transmission loss in the ultraviolet region is small,
An optical fiber with excellent radiation resistance can be obtained. Therefore, the method for manufacturing an optical fiber preform according to the present invention is as follows:
It can be used over a wide range of areas.
第１図は、本発明による光ファイバ母材の製造方法を実
施するための製造装置の構造を示す概略図である。
第２図は、本発明による光ファイバ母材の製造方法を実
施して作製した光ファイバのＥＳＲ測定結果を示す図で
ある。
（主な参照番号）
１・・石英支持棒、 ２・・石英ガラス炉心管、３・・
石英ガラス微粒子多孔質体、
４・・カーボン・ヒータFIG. 1 is a schematic diagram showing the structure of a manufacturing apparatus for carrying out the method for manufacturing an optical fiber preform according to the present invention. FIG. 2 is a diagram showing the ESR measurement results of an optical fiber manufactured by carrying out the method for manufacturing an optical fiber preform according to the present invention. (Main reference numbers) 1.. Quartz support rod, 2.. Quartz glass furnace core tube, 3..
Silica glass fine particle porous body, 4. Carbon heater
Claims (2)
成し、該多孔質体を加熱して透明ガラスとする光ファイ
バ母材の製造方法において、 上記石英系ガラス多孔質体を、酸素分圧が３０％以上の
酸素と不活性ガスとの混合ガス流中で加熱して透明ガラ
スとすることを特徴とする光ファイバ母材の製造方法。(1) A method for producing an optical fiber preform in which a porous body that is a sintered body of silica-based glass particles is formed, and the porous body is heated to produce transparent glass, in which the silica-based glass porous body is A method for manufacturing an optical fiber preform, which comprises heating it in a mixed gas flow of oxygen and an inert gas having an oxygen partial pressure of 30% or more to obtain a transparent glass.
特許請求の範囲第１項記載の光ファイバ母材の製造方法
。(2) The method for manufacturing an optical fiber preform according to claim 1, wherein the inert gas is He.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2736886A JPS62187127A (en) | 1986-02-10 | 1986-02-10 | Production of optical fiber base material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2736886A JPS62187127A (en) | 1986-02-10 | 1986-02-10 | Production of optical fiber base material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62187127A true JPS62187127A (en) | 1987-08-15 |
Family
ID=12219103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2736886A Pending JPS62187127A (en) | 1986-02-10 | 1986-02-10 | Production of optical fiber base material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62187127A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1270522A1 (en) * | 2001-06-26 | 2003-01-02 | FITEL USA CORPORATION (a Delaware Corporation) | Method for fabricating optical fiber from preforms, using control of the partial pressure of oxygen during preform dehydration |
| JP2003026438A (en) * | 2001-06-26 | 2003-01-29 | Fitel Usa Corp | Method and apparatus for manufacturing optical fiber using improved oxygen stoichiometric ratio and deuterium exposure |
-
1986
- 1986-02-10 JP JP2736886A patent/JPS62187127A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1270522A1 (en) * | 2001-06-26 | 2003-01-02 | FITEL USA CORPORATION (a Delaware Corporation) | Method for fabricating optical fiber from preforms, using control of the partial pressure of oxygen during preform dehydration |
| JP2003026438A (en) * | 2001-06-26 | 2003-01-29 | Fitel Usa Corp | Method and apparatus for manufacturing optical fiber using improved oxygen stoichiometric ratio and deuterium exposure |
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