JPS6234698B2 - - Google Patents
Info
- Publication number
- JPS6234698B2 JPS6234698B2 JP58090377A JP9037783A JPS6234698B2 JP S6234698 B2 JPS6234698 B2 JP S6234698B2 JP 58090377 A JP58090377 A JP 58090377A JP 9037783 A JP9037783 A JP 9037783A JP S6234698 B2 JPS6234698 B2 JP S6234698B2
- Authority
- JP
- Japan
- Prior art keywords
- base material
- optical fiber
- refractive index
- pocl
- index distribution
- 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]
- C03B37/01413—Reactant delivery systems
-
- 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
- C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
- C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
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)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
本発明は光フアイバ母材の製造方法に係り、特
に光フアイバ母材の屈折率分布定数を制御するの
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 of manufacturing an optical fiber preform, and more particularly to a method of manufacturing an optical fiber preform suitable for controlling the refractive index distribution constant of the optical fiber preform.
光フアイバ母材の製造方法として、バーナー火
炎中にガラスの原料である原料ガスを送り込み、
生成された酸化物微子をバーナの上方の棒状石英
先端に吹きつけて多孔質母材を成長させ、その
後、この多孔質母材を不活性ガス雰囲気中で焼結
ガラス化して光フアイバ母材を製造するVAD
（Vapor−phase axial deposition）が知られてお
り、原料ガスとしては、SiCl4、GeCl4、POCl3を
用い、SiO2−GeO2−P2O5系光フアイバ母材とす
ることが多い。ところで、GeO2は屈折率分布を
制御するために添加され、P2O5は屈折率をSiO2
より大きくする効果があるが、多孔質母材の透明
ガラス化を容易にするためにも添加される。
GeO2は、多孔質母材底面温度に依存して添加量
が決まり、多孔質母材底面の中心部が最も温度が
高く、外側になるほど温度が低い場合には、その
温度勾配に対応した屈折率分布の光フアイバ母材
が製造される。しかし、P2O5は温度勾配に関係
なく多孔質母材底面にほぼ一様に添加されるの
で、光フアイバ母材の最外部付近に屈折率が大き
い部分が発生し、その程度はP2O5の添加量に関
係する。 As a manufacturing method for optical fiber base material, raw material gas, which is the raw material for glass, is sent into the burner flame.
The generated oxide particles are blown onto the rod-shaped quartz tip above the burner to grow a porous base material, and then this porous base material is sintered and vitrified in an inert gas atmosphere to form an optical fiber base material. VAD manufacturing
(Vapor-phase axial deposition) is known, and SiCl 4 , GeCl 4 , and POCl 3 are used as raw material gases, and SiO 2 —GeO 2 —P 2 O 5 based optical fiber base material is often used. By the way, GeO 2 is added to control the refractive index distribution, and P 2 O 5 changes the refractive index to SiO 2
It has the effect of making the porous base material larger, but it is also added to facilitate the transparent vitrification of the porous base material.
The amount of GeO 2 added depends on the temperature at the bottom of the porous base material. If the temperature is highest at the center of the bottom of the porous base material, and the temperature decreases toward the outside, the refraction will correspond to the temperature gradient. An optical fiber matrix with a rate distribution is produced. However, since P 2 O 5 is almost uniformly added to the bottom surface of the porous base material regardless of the temperature gradient, a portion with a high refractive index occurs near the outermost part of the optical fiber base material, and the extent of this is P 2 It is related to the amount of O5 added.
そのため、従来は、屈折率分布を多孔質母材底
面の形状および温度分布をバーナーガス流量、バ
ーナ位置などを変えることによつて変えて制御し
ていた。しかし、このような方法では、光フアイ
バ母材の周辺部が不均一な屈折率分布となり、こ
れを用いた光フアイバは、伝送帯域、伝送損失が
著しく劣化したものとなつてしまう。 Therefore, conventionally, the refractive index distribution has been controlled by changing the shape and temperature distribution of the bottom surface of the porous base material by changing the burner gas flow rate, burner position, etc. However, in such a method, the peripheral portion of the optical fiber base material has a non-uniform refractive index distribution, and the optical fiber using this has a significantly deteriorated transmission band and transmission loss.
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、伝送帯域が広く、かつ、伝送
損失が小さい光フアイバが得られる光フアイバ母
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 an optical fiber base material that allows obtaining an optical fiber with a wide transmission band and low transmission loss.
本発明の特徴は、VAD法による多孔質母材成
長時に原料ガス中のPOCl3の流量を１〜５mg／
minの範囲で変えて焼結ガラス化後の光フアイバ
母材の屈折率分布を制御するようにした点にあ
る。 The feature of the present invention is that the flow rate of POCl 3 in the raw material gas is reduced from 1 to 5 mg/ml during the growth of the porous base material by the VAD method.
The point is that the refractive index distribution of the optical fiber base material after sintering and vitrification can be controlled by changing it within the range of min.
以下本発明の製造方法の一実施例を第１図、第
２図を参照しながら詳細に説明する。 An embodiment of the manufacturing method of the present invention will be described in detail below with reference to FIGS. 1 and 2.
第１図はPOCl3流量を種々変えて得られた光フ
アイバ母材の屈折率分布図で、ａはPOCl3流量を
零としてGeO2のみを添加したもの、ｂはPOCl3
流量を１mg／minとしたもの、ｃはPOCl3流量を
５mg／minとしたもの、ｄはPOCl3流量を６mg／
minとしたものの屈折率分布である。 Figure 1 shows the refractive index distribution diagrams of optical fiber base materials obtained by varying the POCl 3 flow rate; a is the one with the POCl 3 flow rate set to zero and only GeO 2 is added, and b is the POCl 3
c is the POCl 3 flow rate of 5 mg/min, d is the POCl 3 flow rate of 6 mg/min.
This is the refractive index distribution with min.
第２図はPOCl3流量と屈折率分布定数αとの関
係線図で、第１図、第２図はそれぞれ実験の結果
明らかになつたものである。 Figure 2 is a diagram showing the relationship between the POCl 3 flow rate and the refractive index distribution constant α, and Figures 1 and 2 are each clarified as a result of experiments.
そこで、本発明においては、光フアイバ母材の
製造は、４重管バーナーに、SiCl41200mg／min、
GeCl4110mg／min、POCl31〜５mg／min、Ar1200
c.c.／min、H24.3／min、O28.25／minの流量
で流し、加熱加水分解反応によつて生成された酸
化微粒子をバーナー上方の棒状石英先端に吹きつ
けて多孔質母材を成長させ、その後、この多孔質
母材をHe中で20mm／minの速度で焼結ガラス化し
て透明な光フアイバ母材を得るようにした。 Therefore, in the present invention, the optical fiber base material is manufactured using a quadruple pipe burner, SiCl 4 1200mg/min,
GeCl 4 110mg/min, POCl 3 1~5mg/min, Ar1200
cc/min, H 2 4.3/min, O 2 8.25/min, and the oxidized fine particles generated by the heating hydrolysis reaction are blown onto the rod-shaped quartz tip above the burner to grow a porous base material. Then, this porous preform was sintered and vitrified in He at a speed of 20 mm/min to obtain a transparent optical fiber preform.
POCl31mg／minの場合は、光フアイバ母材の周
辺部に0.05％の屈折率差の立ち上がりが見られ、
屈折率分布定数αは2.2となり、これを用いた光
フアイバは、0.85μｍにおける伝送帯域は、
600MHz・Km以上であり、伝送損失は0.85μｍで
2.3dB／Km、1.3μｍで0.6dB／Kmと良好であつ
た。 In the case of POCl 3 1 mg/min, a rise in the refractive index difference of 0.05% was observed at the periphery of the optical fiber base material.
The refractive index distribution constant α is 2.2, and the optical fiber using this has a transmission band of 0.85 μm.
600MHz・Km or more, transmission loss is 0.85μm
It was good at 2.3dB/Km and 0.6dB/Km at 1.3μm.
また、POCl34mg／minの場合は、周辺部に0.15
％の屈折率差の立ち上がりが見られ、屈折率分布
定数ａは1.8となり、0.85μｍにおける伝送帯域
は800MHz・Kmであり、伝送損失はPOCl31mg／
minの場合と同じで良好であつた。 In addition, in the case of POCl 3 4mg/min, 0.15
% rise in the refractive index difference is seen, the refractive index distribution constant a is 1.8, the transmission band at 0.85 μm is 800 MHz Km, and the transmission loss is POCl 3 1 mg/Km.
It was as good as the min case.
これに対してPOCl3＝０mg／minの場合は、屈
折率分布定数αが大きくなり、伝送帯域が著しく
劣化し、また、0.85μｍでの伝送損失が2.5dB／
Kmと大きかつた。 On the other hand, when POCl 3 = 0 mg/min, the refractive index distribution constant α becomes large, the transmission band deteriorates significantly, and the transmission loss at 0.85 μm is 2.5 dB/min.
Km and big.
また、POCl36mg／min以上の場合は、周辺部に
0.2％の屈折率差の立ち上がりが見られ、屈折率
分布定数ａは1.5以下となり、広帯域の特性のも
のは得られなかつた。また、伝送損失も1.3μｍ
で1dB／Km以上と悪かつた。 In addition, if POCl 3 6mg/min or more, the surrounding area
A rise in the refractive index difference of 0.2% was observed, the refractive index distribution constant a was 1.5 or less, and broadband characteristics could not be obtained. Also, the transmission loss is 1.3μm
It was bad, more than 1dB/Km.
以上の結果からわかるように、本発明のよう
に、POCl3の流量を１〜５mg／minの範囲で変え
て、焼結ガラス化後の光フアイバ母材の屈折率分
布常数αを制御すると、伝送帯域が広く、かつ、
伝送損失が小さい光フアイバが得られる光フアイ
バ母材を製造することができる。 As can be seen from the above results, when the flow rate of POCl 3 is varied in the range of 1 to 5 mg/min to control the refractive index distribution constant α of the optical fiber base material after sintering and vitrification, as in the present invention, The transmission band is wide and
It is possible to manufacture an optical fiber base material that provides an optical fiber with low transmission loss.
以上説明したように、本発明によれば、バーナ
ー位置やH2流量などを変えなくとも、屈折率分
布定数αを制御でき、伝送帯域が広く、かつ伝送
損失が小さい光フアイバが得られる光フアイバ母
材を製造でき、しかも、再現性が良好であるとい
う効果がある。 As explained above, according to the present invention, the refractive index distribution constant α can be controlled without changing the burner position or the H 2 flow rate, and an optical fiber with a wide transmission band and low transmission loss can be obtained. This method has the advantage that the base material can be manufactured with good reproducibility.
第１図はPOCl3流量を種々変え得られた光フア
イバ母材の屈折率分布図、第２図はPOCl3流量と
屈折率分布定数αとの関係線図である。
FIG. 1 is a refractive index distribution diagram of optical fiber base materials obtained by varying the POCl 3 flow rate, and FIG. 2 is a relationship diagram between the POCl 3 flow rate and the refractive index distribution constant α.
Claims (1)
SiCl4、GeCl4及びPOCl3を用いて原料ガスを送り
込み、生成された酸化物微粒子を前記バーナーの
上方の棒状石英先端に吹きつけて多孔質母材を成
長させ、その後該多孔質母材を不活性ガス雰囲気
中で焼結ガラス化して光フアイバ母材を製造する
ときに、前記多孔質母材成長開始から成長終了ま
での間バーナー位置及びH2流量を変化させるこ
となく、前記原料ガス中のPOCl3の流量を１〜５
mg／minの範囲で変えて焼結ガラス化後の光フア
イバ母材の屈折率分布を制御することを特徴とす
る光フアイバ母材の製造方法。1 The raw material for glass is in the burner flame.
A raw material gas is fed using SiCl 4 , GeCl 4 and POCl 3 , and the generated oxide fine particles are blown onto the rod-shaped quartz tip above the burner to grow a porous base material, and then the porous base material is grown. When producing an optical fiber preform by sintering and vitrifying in an inert gas atmosphere, the burner position and H 2 flow rate are not changed from the start of the growth of the porous preform to the end of the growth. Flow rate of POCl 3 from 1 to 5
A method for producing an optical fiber base material, characterized in that the refractive index distribution of the optical fiber base material after sintering and vitrification is controlled by changing the refractive index distribution within the range of mg/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9037783A JPS59217636A (en) | 1983-05-23 | 1983-05-23 | Manufacture of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9037783A JPS59217636A (en) | 1983-05-23 | 1983-05-23 | Manufacture of optical fiber preform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59217636A JPS59217636A (en) | 1984-12-07 |
| JPS6234698B2 true JPS6234698B2 (en) | 1987-07-28 |
Family
ID=13996872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9037783A Granted JPS59217636A (en) | 1983-05-23 | 1983-05-23 | Manufacture of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59217636A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5744380B2 (en) | 2009-03-26 | 2015-07-08 | 株式会社フジクラ | Optical fiber |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56160339A (en) * | 1980-05-14 | 1981-12-10 | Nippon Telegr & Teleph Corp <Ntt> | Method and apparatus for manufacturing base material for optical fiber |
| JPS5738329A (en) * | 1980-07-09 | 1982-03-03 | Nippon Telegr & Teleph Corp <Ntt> | Controlling method for deposition of oxide powder in axial vapor deposition method |
| JPS5748513A (en) * | 1980-08-29 | 1982-03-19 | Sharp Seiki Kk | Conveyor |
-
1983
- 1983-05-23 JP JP9037783A patent/JPS59217636A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59217636A (en) | 1984-12-07 |
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