JPS6293B2 - - Google Patents
Info
- Publication number
- JPS6293B2 JPS6293B2 JP57083560A JP8356082A JPS6293B2 JP S6293 B2 JPS6293 B2 JP S6293B2 JP 57083560 A JP57083560 A JP 57083560A JP 8356082 A JP8356082 A JP 8356082A JP S6293 B2 JPS6293 B2 JP S6293B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- glass tube
- pipe
- optical fiber
- manufacturing
- 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
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]
- C03B37/018—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 glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01861—Means for changing or stabilising the diameter or form of tubes or rods
- C03B37/01869—Collapsing
-
- 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]
- C03B37/018—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 glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
本発明は偏波面保存光フアイバ母材の製造方法
に係り、特に低損失の楕円コア型偏波面保存光フ
アイバを容易に作成するのに好適な光フアイバ母
材の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a polarization-maintaining optical fiber preform, and in particular, to a method for manufacturing an optical fiber preform suitable for easily producing a low-loss elliptical core type polarization-maintaining optical fiber. It is about the method.
楕円コア型偏波面保存光フアイバを作る場合、
ガラス管の内面に化学気相堆積法（以下MCVD
法という。）により屈折率が異なるガラス層を順
次堆積させ、これを中実化（Collapse）するとき
に、ガラス管内を減圧し、中実部の温度、化学気
相反応により生成されたガラス層の軟化点に特殊
な条件を与えて偏波面保存光フアイバ母材を製造
して、これより偏波面保存光フアイバを作る方法
があるが、この場合は、コアになる部分を安定に
楕円化するため、その部分の融点を著しく低くす
る必要があり、また、GeO2などの屈折率を高め
るドーパントを相当多量に入れる必要があり、こ
のため、レーリー散乱損が大きくなり、長距離伝
送に適さなくなるという問題を生ずる。 When making an elliptical core type polarization maintaining optical fiber,
Chemical vapor deposition (MCVD) is applied to the inner surface of the glass tube.
It's called law. ) to sequentially deposit glass layers with different refractive indexes, and when collapsing them, the pressure inside the glass tube is reduced, the temperature of the solid part, and the softening point of the glass layer produced by chemical vapor phase reaction. There is a method of manufacturing a polarization-preserving optical fiber by applying special conditions to the base material of the polarization-preserving optical fiber, but in this case, in order to stably ovalize the part that will become the core, It is necessary to significantly lower the melting point of the part, and it is also necessary to incorporate a considerable amount of a dopant that increases the refractive index, such as GeO 2 , which increases Rayleigh scattering loss and makes it unsuitable for long-distance transmission. arise.
本発明は上記に鑑みてなされたもので、その目
的とするところは、低伝送損失の楕円コア型偏波
面保存光フアイバを容易に作製することができる
偏波面保存光フアイバ母材の製造方法を提供する
ことにある。 The present invention has been made in view of the above, and an object of the present invention is to provide a method for manufacturing a polarization-maintaining optical fiber base material that can easily produce an elliptical-core type polarization-maintaining optical fiber with low transmission loss. It is about providing.
本発明の特徴は、ガラス管の内面にMCVD法
により屈折率が異なるガラス層を順次堆積させ、
その後中実化するときに、上記ガラス管と同一回
転数で回転する先端部を両側にガス噴射口を設け
た状態で密封したパイプを上記ガラス管の中心に
挿入し、このパイプと上記ガラス管との間の空間
を減圧するとともに上記パイプの先端部のガス噴
射口からガスを噴射させ、上記ガラス層を堆積さ
せたガラス管を順次中実化するための加熱バーナ
と同一速度で同一方向に上記パイプを移動させな
がら中実化して光フアイバプリフオームとするよ
うにした点にある。 The present invention is characterized by sequentially depositing glass layers with different refractive indexes on the inner surface of a glass tube by MCVD method.
After that, when solidifying, a sealed pipe with a tip that rotates at the same rotation speed as the glass tube and gas injection ports on both sides is inserted into the center of the glass tube, and this pipe and the glass tube At the same time, the gas is injected from the gas injection port at the tip of the pipe at the same speed and in the same direction as the heating burner for sequentially solidifying the glass tubes on which the glass layer has been deposited. The present invention is characterized in that the pipe is solidified while being moved to form an optical fiber preform.
以下本発明の製造方法の一実施例を第１図〜第
３図を用いて詳細に説明する。 An embodiment of the manufacturing method of the present invention will be described in detail below with reference to FIGS. 1 to 3.
第１図は本発明の製造方法の一実施例を説明す
るための製造装置の一例を示す要部説明図であ
る。第１図において、１はガラス管２の内面に
MCVD法によりクラツド、コアとなる屈折率が
異なるガラス層３を順次堆積させた光フアイバプ
リフオーム母材で、第１図はこの光フアイバプリ
フオーム母材１の中実化を行つている状態を示し
てある。４は中実化を行うための加熱バーナで、
５は炎である。加熱バーナ４は図示矢印Ａ方向に
順次移動させて光フアイバプリフオーム母材１を
順次中実化して光フアイバプリフオーム６とす
る。 FIG. 1 is an explanatory view of essential parts showing an example of a manufacturing apparatus for explaining an embodiment of the manufacturing method of the present invention. In Figure 1, 1 is on the inner surface of glass tube 2.
This is an optical fiber preform base material in which glass layers 3 with different refractive indexes are sequentially deposited as a cladding and a core by the MCVD method. Figure 1 shows the state in which this optical fiber preform base material 1 is solidified. It is shown. 4 is a heating burner for solidification;
5 is a flame. The heating burner 4 is sequentially moved in the direction of arrow A in the figure to sequentially solidify the optical fiber preform base material 1 into an optical fiber preform 6.
ところで、ガラス管２の中心にはガラスパイプ
７が挿入してあり、ガラスパイプ７は、回転コネ
クタ８によつてガラス管２と一緒に同一回転数で
回転するようにしてあり、また、ガラスパイプ７
の先端が常に炎５の手前に位置するように、加熱
バーナ４と同一速度で同一方向に移動させるよう
にしてある。 By the way, a glass pipe 7 is inserted into the center of the glass tube 2, and the glass pipe 7 is rotated together with the glass tube 2 at the same rotation speed by a rotary connector 8. 7
It is moved at the same speed and in the same direction as the heating burner 4 so that its tip is always located in front of the flame 5.
ガラスパイプ７の先端部は、第２図に示すよう
に、めくらぶた９で塞いであり、かつ、先端部両
側にガス噴射口１０が設けてある。 As shown in FIG. 2, the tip of the glass pipe 7 is closed with a blind lid 9, and gas injection ports 10 are provided on both sides of the tip.
ガラス管２とガラスパイプ７との間の空間は第
１図の矢印Ｂ方向に排気して減圧してあり、また
ガラスパイプ７にガスを送入して先端部のガス噴
射口１０から噴射させてある。したがつて、この
ガスは図示矢印Ｃのように環流する。 The space between the glass tube 2 and the glass pipe 7 is evacuated in the direction of arrow B in FIG. There is. Therefore, this gas circulates as shown by arrow C in the figure.
このように、ガラス管２、すなわち、光フアイ
バプリフオーム母材１とガラスパイプ７とは同一
回転数で回転しており、かつ、ガラス管２内には
ガラスパイプ７から中実化部分にガスが噴射され
ていて、しかも、ガラス管２内を排気して減圧し
てあるから、加熱バーナ４からの炎５によつて加
熱されて光フアイバプリフオーム母材１が中実化
するときに、第３図に示す断面の光フアイバプリ
フオーム（偏波面保存光フアイバ母材）６が得ら
れる。第３図において、１１はGeO2−SiO2ガラ
スからなるコア部で、断面が楕円形状となつてお
り、比屈折率差が１％となるようにしてある。１
２はSiO2にB2O3やP2O5をドープして粘度がコア
部１１より高くしてあるクラツド部で、１３はサ
ポートである。 In this way, the glass tube 2, that is, the optical fiber preform base material 1 and the glass pipe 7, are rotating at the same rotation speed, and gas is flowing from the glass pipe 7 to the solid part in the glass tube 2. is being injected and the pressure inside the glass tube 2 has been reduced by exhausting the air, so when the optical fiber preform base material 1 is heated by the flame 5 from the heating burner 4 and solidified, An optical fiber preform (polarization preserving optical fiber base material) 6 having a cross section shown in FIG. 3 is obtained. In FIG. 3, reference numeral 11 denotes a core made of GeO 2 --SiO 2 glass, which has an elliptical cross section and is designed to have a relative refractive index difference of 1%. 1
2 is a cladding portion in which SiO 2 is doped with B 2 O 3 or P 2 O 5 to have a higher viscosity than the core portion 11, and 13 is a support.
このようにして製造された偏波面保存光フアイ
バ母材６から、第３図とほぼ同一の断面形状の偏
波面保存光フアイバを容易に作製することができ
る。しかも、コア部１１の形状の安定度がよく、
また、コア部１１を高ドープしなくとも楕円化が
可能であるから、低伝送損失の光フアイバを得る
ことができる。 From the polarization-maintaining optical fiber preform 6 manufactured in this manner, a polarization-maintaining optical fiber having a cross-sectional shape substantially the same as that shown in FIG. 3 can be easily produced. Moreover, the stability of the shape of the core portion 11 is good,
Further, since it is possible to make the core portion 11 elliptical without heavily doping it, an optical fiber with low transmission loss can be obtained.
なお、第１図では、ガラスパイプ７を用いてい
るが、カーボンパイプを用いるようにしてもよい
ことはいうまでもない。また、パイプ７から噴射
させるガス中に塩素ガスを含ませると、ガラス層
３に含まれるOH基を低減して、OH基による吸
収光伝送損失を低減することができる。 Although the glass pipe 7 is used in FIG. 1, it goes without saying that a carbon pipe may also be used. Moreover, when chlorine gas is included in the gas injected from the pipe 7, the OH groups contained in the glass layer 3 can be reduced, and the absorption light transmission loss due to the OH groups can be reduced.
以上説明したように、本発明によれば、低伝送
損失の楕円コア型偏波面保存光フアイバを容易に
作製することができる偏波面保存光フアイバ母材
を製造することができるという効果がある。 As described above, the present invention has the advantage that it is possible to manufacture a polarization-maintaining optical fiber base material that allows easy production of an elliptical-core type polarization-maintaining optical fiber with low transmission loss.
第１図は本発明の偏波面保存光フアイバ母材の
製造方法の一実施例を説明するための製造装置の
一例を示す要部説明図、第２図は第１図のガラス
パイプの先端部構造説明図、第３図は第１図によ
つて製造される光フアイバプリフオームの断面図
である。
１：光フアイバプリフオーム母材、２：ガラス
管、３：クラツド、コアとなるガラス管、４：加
熱バーナ、５：炎、６：光フアイバプリフオー
ム、７：ガラスパイプ、８：回転コネクタ、９：
めくらぶた、１０：ガス噴射口。
FIG. 1 is an explanatory view of a main part showing an example of a manufacturing apparatus for explaining an embodiment of the method for manufacturing a polarization-maintaining optical fiber preform of the present invention, and FIG. 2 is a tip of the glass pipe shown in FIG. 1. 3 is a sectional view of the optical fiber preform manufactured according to FIG. 1. 1: Optical fiber preform base material, 2: Glass tube, 3: Clad, core glass tube, 4: Heating burner, 5: Flame, 6: Optical fiber preform, 7: Glass pipe, 8: Rotating connector, 9:
Blind pig, 10: Gas injection port.
Claims (1)
率の異なるガラス層を堆積させ、その後ガラス管
を中実化して光フアイバ母材を製造する方法にお
いて、先端部の両側にガス噴射口が設けられてい
るパイプをガラス管内に挿入し、前記ガラス管と
パイプとを同一回転数で同方向に回転させ、前記
ガラス管とパイプとの空隙を減圧するとともに前
記パイプの先端部ガス噴射口からガラス層を形成
するための原材料ガスを噴射させ、前記ガラス層
を堆積したガラス管を中実化するための加熱バー
ナーと同一速度で同一方向に前記パイプを移動す
ることを特徴とする偏波面保存光フアイバ母材の
製造方法。1 In a method of manufacturing an optical fiber base material by depositing glass layers with different refractive indexes on the inner surface of a glass tube by chemical vapor deposition and then solidifying the glass tube, gas injection ports are provided on both sides of the tip. The glass tube and the pipe are rotated in the same direction at the same rotation speed to reduce the pressure in the gap between the glass tube and the pipe, and the glass is discharged from the gas injection port at the tip of the pipe. Polarization preserving light characterized by injecting raw material gas for forming the layer and moving the pipe at the same speed and in the same direction as a heating burner for solidifying the glass tube on which the glass layer has been deposited. Method for manufacturing fiber matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57083560A JPS58199738A (en) | 1982-05-17 | 1982-05-17 | Method for manufacturing polarization preserving optical fiber base material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57083560A JPS58199738A (en) | 1982-05-17 | 1982-05-17 | Method for manufacturing polarization preserving optical fiber base material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58199738A JPS58199738A (en) | 1983-11-21 |
| JPS6293B2 true JPS6293B2 (en) | 1987-01-06 |
Family
ID=13805893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57083560A Granted JPS58199738A (en) | 1982-05-17 | 1982-05-17 | Method for manufacturing polarization preserving optical fiber base material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58199738A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0532292U (en) * | 1991-09-30 | 1993-04-27 | 誠治 中野 | Lifting berth with port side fixing device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2006962C2 (en) * | 2011-06-17 | 2012-12-18 | Draka Comteq Bv | DEVICE AND METHOD FOR MANUFACTURING AN OPTICAL FORM. |
-
1982
- 1982-05-17 JP JP57083560A patent/JPS58199738A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0532292U (en) * | 1991-09-30 | 1993-04-27 | 誠治 中野 | Lifting berth with port side fixing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58199738A (en) | 1983-11-21 |
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