JPH06298540A - Production of optical fiber preform - Google Patents
Production of optical fiber preformInfo
- Publication number
- JPH06298540A JPH06298540A JP10720793A JP10720793A JPH06298540A JP H06298540 A JPH06298540 A JP H06298540A JP 10720793 A JP10720793 A JP 10720793A JP 10720793 A JP10720793 A JP 10720793A JP H06298540 A JPH06298540 A JP H06298540A
- Authority
- JP
- Japan
- Prior art keywords
- jig
- preform
- porous glass
- platinum
- 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
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]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、光ファイバ母材の製
造方法に関するもので、外付け法などによって得られる
光ファイバ用の多孔質ガラスプリフォームを破壊するこ
となく支持して、これを炉内に導き処理する方法を提供
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an optical fiber preform, which supports a porous glass preform for an optical fiber obtained by an external attachment method, etc. without destroying it and uses it in a furnace. Provide a way to guide and process within.
【０００２】[0002]
【従来の技術】光ファイバ母材の製造工程中、外付け法
によってコア用ロッドの周りにクラッド用のガラス微粒
子を堆積させて多孔質ガラスプリフォームとし、次い
で、これを治具を用いて垂直に支持して高温の炉内に導
き処理する工程がある。ここで、処理というのはＨｅな
どの不活性ガス雰囲気での多孔質ガラスの透明ガラス化
やＳｉＦ4 などのフッ素ガスとＨｅなどの不活性ガスと
の混合ガス雰囲気での多孔質ガラスの透明カラス化など
をいう。図１は、多孔質ガラスプリフォームの透明ガラ
ス化を行う装置の概略図で、１は多孔質ガラスプリフォ
ームで、例えば、ＳｉＯ2 ガラス系のコア用ロッドの周
りにクラッド用のＳｉＯ2 ガラス微粒子からなる多孔質
ガラス層が形成されてなるもの、２はコア用ロッドの先
端部に融着接続されたＳｉＯ2 ガラスからなるダミーロ
ッドで、その長さ方向と直交して後述する固定手段であ
るピンが嵌挿される貫通孔２１を備えてなるもの、３は
このダミーロッド２を垂直に支持する保持治具で、中空
円筒状のＳｉＯ2 ロッド４とＳｉＯ2 ガラスからなるピ
ン５とからなり、中空円筒状のＳｉＯ2 ロッド４の下端
近傍にはその長さ方向に直交する一対のピン装着孔４
１、４１が形成されている。そして、ダミーロッド２を
中空円筒状のＳｉＯ2 ロッド４の下端部に嵌挿させ、ピ
ン５をダミーロッド２の貫通孔２１およびロッド４のピ
ン装着孔４１に嵌挿支持する。６はＳｉＯ2 管で、その
下方には開口６１を備えていて、例えばＨｅガスが供給
される。７はＳｉＯ2 管６の周りを囲む発熱体である。2. Description of the Related Art During the process of manufacturing an optical fiber preform, glass particles for cladding are deposited around a core rod by an external attachment method to form a porous glass preform, which is then vertically cut using a jig. There is a step of supporting it in a high temperature furnace and treating it. Here, the treatment means transparent vitrification of porous glass in an atmosphere of an inert gas such as He or transparent glass of porous glass in a mixed gas atmosphere of a fluorine gas such as SiF 4 and an inert gas such as He. It refers to FIG. 1 is a schematic view of an apparatus for performing vitrification of a porous glass preform into a transparent glass, and 1 is a porous glass preform, for example, SiO 2 glass fine particles for cladding around a SiO 2 glass-based core rod. And 2 is a dummy rod made of SiO 2 glass that is fusion-bonded to the tip of the core rod, and is a fixing means to be described later that is orthogonal to the length direction thereof. What is provided with a through hole 21 into which the pin is inserted, 3 is a holding jig for vertically supporting this dummy rod 2, which is composed of a hollow cylindrical SiO 2 rod 4 and a pin 5 made of SiO 2 glass, Near the lower end of the hollow cylindrical SiO 2 rod 4, there are a pair of pin mounting holes 4 orthogonal to the length direction.
1, 41 are formed. Then, the dummy rod 2 is fitted into the lower end of the hollow cylindrical SiO 2 rod 4, and the pin 5 is fitted into and supported by the through hole 21 of the dummy rod 2 and the pin mounting hole 41 of the rod 4. Reference numeral 6 is a SiO 2 tube, which is provided with an opening 61 below the tube and is supplied with, for example, He gas. A heating element 7 surrounds the SiO 2 tube 6.
【０００３】以上の構成で、多孔質ガラスプリフォーム
１は保持治具３によって垂直に吊るされ、所定の速度で
ＳｉＯ2 管６内に導かれる。ＳｉＯ2 管６内を発熱体７
による輻射熱でおよそ１５００℃に維持しておくと多孔
質ガラスの透明化が図れる。ところで、従来は保持治具
３、中でもピン５には多孔質ガラスと同成分であるＳｉ
Ｏ2 ガラスを用いてきた。その理由は、光ファイバの伝
送損失に対して最も大きな障害となる不純物の混入を減
少させるためであり、鉄などを素材とした場合、光通信
に使われる１．３３μｍ、１．５５μｍ波長帯に影響す
る特有の吸収ピークが出現し、作製した光ファイバの伝
送損失が増加してしまい実用に適さないからである。With the above construction, the porous glass preform 1 is suspended vertically by the holding jig 3 and guided into the SiO 2 tube 6 at a predetermined speed. Inside the SiO 2 tube 6, a heating element 7
If the temperature is maintained at about 1500 ° C. by the radiant heat due to, the porous glass can be made transparent. By the way, conventionally, the holding jig 3, especially the pin 5 is made of Si having the same composition as the porous glass.
O 2 glass has been used. The reason is to reduce the mixture of impurities, which is the biggest obstacle to the transmission loss of the optical fiber. When using iron or the like as a material, the wavelength band of 1.33 μm and 1.55 μm used for optical communication can be obtained. This is because a peculiar absorption peak that influences appears and the transmission loss of the manufactured optical fiber increases, which is not suitable for practical use.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、治具の
一部をなすピンとして多孔質ガラスと同成分のＳｉＯ2
ガラスを用いるのは、光学特性に対しては有効である
が、ガラスということで脆性材料であることから破壊の
危険性を潜在的に有していた。特に、昨今の光ファイバ
プリフォームの大型化による重量増に伴って、実際に多
孔質ガラスを保持しているときにピンが破壊してしまう
ということがあった。However, as a pin forming a part of the jig, SiO 2 having the same composition as the porous glass is used.
The use of glass is effective for optical properties, but since glass is a brittle material, it has a risk of breaking. Particularly, due to the increase in weight due to the recent increase in the size of optical fiber preforms, the pins sometimes break when actually holding the porous glass.
【０００５】[0005]
【課題を解決するための手段】この発明は、以上の観点
から治具を破壊することなく多孔質ガラスプリフォーム
を支持して、その処理を施しうる方法を提供しようとす
るもので、その特徴とする請求項１記載の発明は、コア
用ロッドの周りにクラッドとなる多孔質ガラス層が形成
された光ファイバ用の多孔質ガラスプリフォームの、前
記コアの一端を治具を用いて垂直に支持し、これを炉内
に導いて処理する光ファイバ母材の製造方法において、
前記治具を白金製としたことにある。また、その特徴と
する請求項２記載の発明は、コア用ロッドの一端にダミ
ーロッドが接続され、このダミーロッドに治具が取付け
られてなることにある。さらにまた、その特徴とする請
求項３記載の発明は、治具が、少なくともその先端部に
ダミーロッドが嵌挿される取付け部を有する棒状の本体
部と、この取付け部に嵌挿されたダミーロッドを固定す
る固定手段であるピンとからなり、このピンが白金製か
らなることにある。なお、ここで白金製というのは、白
金、白金とロジウムの合金、白金に酸化ジルコニウムを
分散したもの、白金とロジウムの合金に酸化ジルコニウ
ムを分散したものなどをいう。SUMMARY OF THE INVENTION From the above viewpoints, the present invention is intended to provide a method capable of supporting a porous glass preform and destroying the jig without breaking the jig. According to a first aspect of the present invention, one end of the core of a porous glass preform for an optical fiber in which a porous glass layer serving as a clad is formed around a core rod is vertically aligned using a jig. In the method of manufacturing an optical fiber preform, which supports and guides this into a furnace,
The jig is made of platinum. Further, the invention according to claim 2 is characterized in that a dummy rod is connected to one end of the core rod, and a jig is attached to the dummy rod. Furthermore, the invention according to claim 3 is characterized in that the jig has a rod-shaped main body portion having a mounting portion into which the dummy rod is fitted and inserted at least at its tip portion, and a dummy rod fitted and inserted into this mounting portion. And a pin which is a fixing means for fixing the pin. This pin is made of platinum. Here, the term "made of platinum" means platinum, an alloy of platinum and rhodium, one in which zirconium oxide is dispersed in platinum, one in which zirconium oxide is dispersed in an alloy of platinum and rhodium, and the like.
【０００６】[0006]
【作用】光ファイバ用の多孔質ガラスプリフォームを垂
直に支持する治具が白金製であるので、多孔質ガラスプ
リフォームの大型化に十分耐える機械的強度を有すると
ともに、フッ素系ガスなどの雰囲気においても実質的に
安定な性質であるので多孔質ガラスを汚染することがな
い。[Function] Since the jig for vertically supporting the porous glass preform for the optical fiber is made of platinum, it has sufficient mechanical strength to withstand the increase in size of the porous glass preform, and the atmosphere such as fluorine-based gas. In the above, since it has a substantially stable property, it does not contaminate the porous glass.
【０００７】[0007]
【実施例１】図１において、５は治具の一部を構成する
固定手段としての白金製のピンである。なお、ピン５の
みを白金製とすることなく治具３全体を白金製としても
よく、価格、機械的信頼性を考慮して適切な形態を選択
することができる。[Embodiment 1] In FIG. 1, 5 is a pin made of platinum as a fixing means constituting a part of a jig. The jig 3 as a whole may be made of platinum without making only the pin 5 of platinum, and an appropriate form can be selected in consideration of price and mechanical reliability.
【０００８】（具体例）本発明の効果を調べるために以
下の保持治具のピンを用意した。 （Ａ）直径４ｍｍ、長さ６０ｍｍのＳｉＯ2 ガラス製棒 （Ｂ）同サイズの白金製棒 （Ｃ）同サイズの白金−酸化ジルコニウム製棒 そして、これらピンを用いて、図１に示すように多孔質
ガラスプリフォームを吊るし、Ｈｅガス雰囲気で１５０
０℃、５時間の条件の下で透明ガラス化を図った。な
お、多孔質ガラスプリフォームの総重量は約５０００ｇ
である。表１は、上記３種類のピンの機械的信頼性（破
壊頻度）を比較した結果を示している。(Specific Example) In order to investigate the effect of the present invention, the following pins of a holding jig were prepared. (A) SiO 2 glass rod with a diameter of 4 mm and length of 60 mm (B) Platinum rod of the same size (C) Platinum-zirconium oxide rod of the same size Then, as shown in FIG. 1, using these pins. Suspend the porous glass preform, and 150 in He gas atmosphere.
Transparent vitrification was achieved under conditions of 0 ° C. and 5 hours. The total weight of the porous glass preform is about 5000g.
Is. Table 1 shows the results of comparing the mechanical reliability (breakage frequency) of the above three types of pins.
【０００９】[0009]
【表１】 [Table 1]
【００１０】また、それぞれのピンを用いて透明ガラス
化した各光ファイバ母材を溶融線引きして得られた各光
ファイバの伝送損失波長特性を調べたところ、いずれも
遜色なく良好な結果であった。Further, when the transmission loss wavelength characteristics of each optical fiber obtained by melting and drawing the respective optical fiber preforms transparentized by using the respective pins were examined, it was found that all the results were comparable. It was
【００１１】[0011]
【発明の効果】この発明方法による光ファイバ母材の製
造方法は、多孔質ガラスプリフォームを治具を用いて吊
るし、炉内に導いて処理するに際して、治具を白金製と
したので大型の多孔質ガラスプリフォームを支えるに十
分な機械的強度を有するとともに、炉内雰囲気に侵され
ることがないという利点を有する。According to the method for producing an optical fiber preform according to the method of the present invention, since the porous glass preform is hung by using a jig and is introduced into the furnace for processing, the jig is made of platinum, so that it is large in size. It has the mechanical strength sufficient to support the porous glass preform and has the advantage that it is not attacked by the atmosphere in the furnace.
【図１】多孔質ガラスプリフォームの透明ガラス化を行
なう装置の概略説明図である。FIG. 1 is a schematic explanatory view of an apparatus for performing vitrification of a porous glass preform.
１ 多孔質ガラスプリフォーム ２ ダミーロッド ３ 保持治具 ５ ピン 1 Porous glass preform 2 Dummy rod 3 Holding jig 5 pins
Claims (3)
孔質ガラス層が形成された光ファイバ用の多孔質ガラス
プリフォームの、前記コアの一端を治具を用いて垂直に
支持し、これを炉内に導いて処理する光ファイバ母材の
製造方法において、前記治具を白金製としたことを特徴
とする光ファイバ母材の製造方法。1. A porous glass preform for an optical fiber in which a porous glass layer serving as a clad is formed around a core rod, and one end of the core is vertically supported using a jig, and the core is supported by a jig. A method for manufacturing an optical fiber preform in which the jig is made of platinum in a method for manufacturing an optical fiber preform that is introduced into a furnace for processing.
続され、このダミーロッドに治具が取付けられてなるこ
とを特徴とする請求項１記載の光ファイバ母材の製造方
法。2. The method for producing an optical fiber preform according to claim 1, wherein a dummy rod is connected to one end of the core rod, and a jig is attached to the dummy rod.
ロッドが嵌挿される取付け部を有する棒状の本体部と、
この取付け部に嵌挿されたダミーロッドを固定する固定
手段とからなり、この固定手段が白金製であることを特
徴とする請求項２記載の光ファイバ母材の製造方法。3. A rod-shaped main body portion having a mounting portion into which a dummy rod is fitted and inserted at least at its tip end portion,
3. The method for manufacturing an optical fiber preform according to claim 2, further comprising a fixing means for fixing the dummy rod fitted in the mounting portion, the fixing means being made of platinum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10720793A JPH06298540A (en) | 1993-04-12 | 1993-04-12 | Production of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10720793A JPH06298540A (en) | 1993-04-12 | 1993-04-12 | Production of optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06298540A true JPH06298540A (en) | 1994-10-25 |
Family
ID=14453203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10720793A Pending JPH06298540A (en) | 1993-04-12 | 1993-04-12 | Production of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06298540A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1108689A2 (en) * | 1999-12-13 | 2001-06-20 | Lucent Technologies Inc. | Process for heat treating a silica glass overcladding tube |
| KR20030077881A (en) * | 2002-03-27 | 2003-10-04 | 엘지전선 주식회사 | A combination device of coupler for sintering |
| EP1375441A4 (en) * | 2001-03-23 | 2004-08-18 | Sumitomo Electric Industries | Method of supporting glass base material and supporting pin |
-
1993
- 1993-04-12 JP JP10720793A patent/JPH06298540A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1108689A2 (en) * | 1999-12-13 | 2001-06-20 | Lucent Technologies Inc. | Process for heat treating a silica glass overcladding tube |
| EP1108689A3 (en) * | 1999-12-13 | 2002-06-19 | Lucent Technologies Inc. | Process for heat treating a silica glass overcladding tube |
| EP1375441A4 (en) * | 2001-03-23 | 2004-08-18 | Sumitomo Electric Industries | Method of supporting glass base material and supporting pin |
| KR20030077881A (en) * | 2002-03-27 | 2003-10-04 | 엘지전선 주식회사 | A combination device of coupler for sintering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR970006995B1 (en) | Method and apparatus for production of glass preform for optical fiber | |
| KR920001385B1 (en) | Method of forming an optical fiber | |
| KR830002158B1 (en) | Method for forming optical waveguide preform having continuously removable starting member | |
| KR20060033861A (en) | Optical fiber having reduced viscosity mismatch | |
| JPH07223832A (en) | Method of producing glass article and fiber optic coupler | |
| WO2006049186A1 (en) | Method of producing optical fiber parent material, optical glass rod, and optical fiber | |
| US4181403A (en) | Optical fiber with compression surface layer | |
| WO2000010932A1 (en) | Methods and apparatus for producing optical fiber | |
| JPS60103046A (en) | Manufacture of rod in tube optical fiber | |
| EP0043708B1 (en) | Method of forming an optical waveguide preform | |
| US4163654A (en) | Method of manufacturing graded index optical fibers | |
| JP3191418B2 (en) | Optical fiber manufacturing method | |
| JPH04270132A (en) | Production of glass matrix for optical fiber | |
| US5609665A (en) | Method of making optical fiber with low melting glass core | |
| JPH06298540A (en) | Production of optical fiber preform | |
| EP1396476A1 (en) | Method for cutting glass rod and cutting device for use therein | |
| JPS627130B2 (en) | ||
| JPH06305763A (en) | Production of optical fiber preform | |
| WO2002036507A2 (en) | Chalcogenide glass tubing fabrication | |
| JPH0583495B2 (en) | ||
| JP3485673B2 (en) | Dehydration and sintering device for porous preform for optical fiber | |
| US4362542A (en) | Method of producing a strong optical fiber | |
| JPS5918125A (en) | Manufacture of single-polarization single-mode optical fiber | |
| JPH01148725A (en) | Production of optical fiber preform | |
| JPS58104031A (en) | Preparation of parent material for optical fiber |