JPH02192427A - Production of optical fiber preform - Google Patents
Production of optical fiber preformInfo
- Publication number
- JPH02192427A JPH02192427A JP1126989A JP1126989A JPH02192427A JP H02192427 A JPH02192427 A JP H02192427A JP 1126989 A JP1126989 A JP 1126989A JP 1126989 A JP1126989 A JP 1126989A JP H02192427 A JPH02192427 A JP H02192427A
- Authority
- JP
- Japan
- Prior art keywords
- core
- optical fiber
- clad
- boundary
- fiber preform
- 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 8
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000004071 soot Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000005253 cladding Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 7
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 abstract description 12
- 230000003287 optical effect Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 230000015572 biosynthetic process Effects 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
- 238000009826 distribution Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture 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]
- C03B37/01413—Reactant delivery systems
- C03B37/0142—Reactant deposition burners
-
- 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]
- C03B37/0144—Means for after-treatment or catching of worked reactant gases
-
- 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
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/46—Comprising performance enhancing means, e.g. electrostatic charge or built-in heater
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/50—Multiple burner arrangements
Abstract
Description
【発明の詳細な説明】
［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
、特にステップ型プロファイルの屈折率分布を持つ光フ
ァイバ母材を、ＶＡＤ法によって製造する場合に関する
ものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing an optical fiber preform, and in particular, a method for manufacturing an optical fiber preform having a step-shaped profile refractive index distribution by a VAD method. It is about the case.
［従来の技術］ 第２図において。[Conventional technology] In fig.
１０はスート母材の全体で、 ２０はそのコア部、 ３０はクラッド部である。10 is the entire soot base material, 20 is the core part, 30 is a cladding part.
２２はコアバーナ、 ２４はコアスート。22 is a core burner, 24 is the core suit.
３２はクラッドバーナ、 ３４はクラッドスートである。32 is a clad burner, 34 is a clad suit.
通常、コアスート２４は屈折率を上げるためのＧｅＯ２
をドープした５ｉ０２の混合粒子からなり、これをター
ゲット上に堆積させて、コア部２０を生成する。Usually, the core soot 24 is GeO2 to increase the refractive index.
The core part 20 is formed by depositing mixed particles of 5i02 doped with 5i02 on a target.
クラッドスート３４は５ｉ０２からなり、これをコア部
２０の上に堆積させて、クラッド部３０を生成する。The cladding soot 34 is made of 5i02 and is deposited on the core portion 20 to form the cladding portion 30.
コア部２０の生成とクラッド部３０の生成とは、同一工
程で行われる。Generation of the core portion 20 and generation of the cladding portion 30 are performed in the same process.
Ｌ発明が解決しようとする課題］
コア部２０の生成に関与しなかったコアスート２４の一
部が、そのまま上昇して、クラッド部３０に混入する。Problems to be Solved by the Invention] A part of the core soot 24 that did not participate in the generation of the core portion 20 rises as it is and mixes into the cladding portion 30.
すなわち、クラッド部３０にもＧｅＯ２が混入する。That is, GeO2 is mixed into the cladding portion 30 as well.
その結果、母材のクラッド部分にも屈折率の高い部分が
生じてしまい、屈折率分布のプロファイルは、第３図の
実線に示すように、理想的なステップ状（鎖線）になら
ない。As a result, a portion with a high refractive index also occurs in the cladding portion of the base material, and the profile of the refractive index distribution does not take the ideal step shape (dashed line) as shown by the solid line in FIG.
この場合、光学的特性も、理論値に比べて、かなり悪化
する。In this case, the optical properties also deteriorate considerably compared to the theoretical values.
［課題を解決するための手段］
第１ａ、第１ｂ図のように、
コア部２０の生成される部分とクラッド部３０の生成さ
れる部分との境目に、エアシールド４６を設ける。[Means for Solving the Problems] As shown in FIGS. 1a and 1b, an air shield 46 is provided at the boundary between the portion where the core portion 20 is generated and the portion where the cladding portion 30 is generated.
［その説明］ 第１ａ、第１ｂ図において、４０は反応容器を示す。[Explanation] In Figures 1a and 1b, 40 indicates a reaction vessel.
反応容器４０に、エアーの噴出口４２を設ける。設ける
位置は、コア部２０の生成される部分とクラッド部３０
の生成される部分との境目に対応するところである。The reaction vessel 40 is provided with an air outlet 42 . The positions where the core portion 20 is generated and the cladding portion 30 are
This corresponds to the boundary with the generated part.
また、噴出口４２の反対側に排出口４４を設ける。Further, a discharge port 44 is provided on the opposite side of the jet port 42.
噴出口４２からクリーン・エアーを送出して、コア部２
０とクラッド部３０との境目付近にエアーシールド４６
を形成し、送出したクリーン・エアーと堆積されなかっ
たＧ ｅ ０２ ＋ Ｓ ｉ ０２の混合粒子は排出口
４４により吸い取る。Clean air is sent out from the jet nozzle 42 and the core part 2 is
Air shield 46 near the boundary between 0 and cladding part 30
The mixed particles of G e 02 + S i 02 that were not deposited with the sent clean air are sucked out by the exhaust port 44 .
なお、エアーシールド４６は、上下の幅が２ｍｓ程度、
左右の幅が２００ Ｂｍ程度、エアーの流速は０．５
ｍ １ｓｅｃ程度が適当である。Note that the air shield 46 has a vertical width of about 2 ms,
The left and right width is approximately 200 Bm, and the air flow rate is 0.5
Approximately m 1 sec is appropriate.
エアーシールド４６を形成した状態で、上記のように、
コア部２０とクラッド部３０との生成を行う。With the air shield 46 formed, as described above,
A core portion 20 and a cladding portion 30 are generated.
そうすると、コア部２０の生成に関与しなかったコアス
ート２４の一部が、そのまま上昇して、クラッド部３０
に混入するということが、なくなる。Then, a part of the core soot 24 that did not participate in the generation of the core part 20 rises as it is, and the cladding part 30
This eliminates the possibility of contamination.
すなわち、クラッド部３０にＧｅＯ２が混入しないよう
になる。In other words, GeO2 is not mixed into the cladding portion 30.
［実施例］
コアバーナ２２に、
５ｉＣ１４２８０ｃｃ／分
ＧｅＣ１４２１０ｃｃ／分
）１２６！Ｌ／分
０２１２ｆＬ／分
Ａ ｒ ４！Ｌ／分
を送込んでコア部２０を生成、同時に、クラッドバーナ
３２に、
Ｓ ｔ Ｃ１，３８０ｃｃ／分
Ｈ２９５Ｌ／分
０２ ８！Ｌ／分
Ａ ｒ ８００ ｃｃ／分
を送込んでクラッド部３０を生成するとともに、その際
、
上下の幅が２腸組左右の幅が１００ ｍｍ、エアーの流
速は０．５ ｙｇ ／ｓｅｃのエアーシールド４６を形
成して、スート母材１０の生成を行った。[Example] In the core burner 22, 5iC14280cc/min GeC14210cc/min) 126! L/min 0212fL/min A r 4! S t C1, 380 cc/min H295 L/min 02 8! L/min A r 800 cc/min is sent to generate the cladding part 30, and at this time, the upper and lower widths are 100 mm on the left and right sides, and the air flow rate is 0.5 yg/sec. The shield 46 was formed and the soot base material 10 was produced.
それから得た母材の屈折率分布のプロファイルは、第２
図の鎖線に示す、理想的なステップ状に近いものであっ
た。The profile of the refractive index distribution of the base material obtained from this is the second
The shape was close to the ideal step shape shown by the chain line in the figure.
なお、上記の説明は、スート母材１０のコア部２０がＳ
ｉ０２ ＋ＧｅＯ２で、クラッド部３０が５ｉｏ２だ
けの場合であったが、それ以外の組成の場合にも、本発
明は適用できる。Note that in the above description, the core portion 20 of the soot base material 10 is
Although the cladding portion 30 was made of only 5io2 with i02 +GeO2, the present invention can also be applied to cases with other compositions.
［発明の効果１
コア部の生成される部分と前記クラッド部の生成される
部分との境目に、エアシールド層を設けるので、コアス
ートのクラッド部への混入が防止される。[Effect of the Invention 1] Since an air shield layer is provided at the boundary between the portion where the core portion is generated and the portion where the cladding portion is generated, core soot is prevented from entering the cladding portion.
そのため、屈折率分布のプロファイルが理想的なステッ
プ状に近すき、光ファイバの光学的特性も大きく改善さ
れる。Therefore, the profile of the refractive index distribution approaches an ideal step shape, and the optical characteristics of the optical fiber are also greatly improved.
第１ａ図は本発明の詳細な説明図、 第１ｂ図は第１ａ図のＢ−Ｂ断面図、 第２図は従来技術の説明図、 第３図は屈折率分布のプロファイル図。 １０：スート母材 ２２：コアバーナ ３０：クラッド部 ３４：クラッドスート ４０：反応容器 ４４：排出口 ２０：コア部 ２４：コアスート ３２；クラッドバーナ ４２：噴出口 ４６：エアーシールド FIG. 1a is a detailed illustration of the present invention; Figure 1b is a sectional view taken along line BB in Figure 1a; Figure 2 is an explanatory diagram of the prior art; Figure 3 is a profile diagram of refractive index distribution. 10: Soot base material 22: Core burner 30: Cladding part 34: Clad suit 40: Reaction container 44: Outlet 20: Core part 24: Core suit 32; Clad burner 42: Spout 46: Air shield
Claims (1)
、同一工程において生成する、光ファイバ母材の製造方
法において、 前記コア部の生成される部分と前記クラッド部の生成さ
れる部分との境目に、エアシールド層を設ける、光ファ
イバ母材の製造方法。[Scope of Claim] A method for manufacturing an optical fiber preform in which a core portion and a cladding portion of a soot preform are produced in the same step by a VAD method, comprising: a portion where the core portion is generated and a portion of the cladding portion; A method for manufacturing an optical fiber base material, which includes providing an air shield layer at the boundary with the generated part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126989A JPH02192427A (en) | 1989-01-20 | 1989-01-20 | Production of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126989A JPH02192427A (en) | 1989-01-20 | 1989-01-20 | Production of optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02192427A true JPH02192427A (en) | 1990-07-30 |
Family
ID=11773252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1126989A Pending JPH02192427A (en) | 1989-01-20 | 1989-01-20 | Production of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02192427A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10308541B2 (en) | 2014-11-13 | 2019-06-04 | Gerresheimer Glas Gmbh | Glass forming machine particle filter, a plunger unit, a blow head, a blow head support and a glass forming machine adapted to or comprising said filter |
-
1989
- 1989-01-20 JP JP1126989A patent/JPH02192427A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10308541B2 (en) | 2014-11-13 | 2019-06-04 | Gerresheimer Glas Gmbh | Glass forming machine particle filter, a plunger unit, a blow head, a blow head support and a glass forming machine adapted to or comprising said filter |
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