JPS58125621A - Production of preform for optical fiber - Google Patents

Production of preform for optical fiber

Info

Publication number
JPS58125621A
JPS58125621A JP490582A JP490582A JPS58125621A JP S58125621 A JPS58125621 A JP S58125621A JP 490582 A JP490582 A JP 490582A JP 490582 A JP490582 A JP 490582A JP S58125621 A JPS58125621 A JP S58125621A
Authority
JP
Japan
Prior art keywords
preform
gas containing
optical fiber
parent material
sintered
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
Application number
JP490582A
Other languages
Japanese (ja)
Inventor
Motohiro Nakahara
基博 中原
Minoru Watanabe
稔 渡辺
Shigeru Tanaka
茂 田中
Tsunehisa Kyodo
倫久 京藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp, Sumitomo Electric Industries Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP490582A priority Critical patent/JPS58125621A/en
Publication of JPS58125621A publication Critical patent/JPS58125621A/en
Pending legal-status Critical Current

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]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • 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)
  • 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

PURPOSE:An SiO2 porous parent material containing at least one selected from P2O5, GeO2 and B2O3 is sintered in the presence of a gas containing a phosphorus compound to produce polymode glass fiber with less pulse dispersion over a wide range of wave length. CONSTITUTION:By the VAD process, an SiO2 porous parent material 1 doped with P2O5 or other substances is deposited on the end of the seed rod 2. Then, the porous parent material 1 is put in the furnace core tube 3 filled with a gas containing a phosphorus compound such as He gas containing POCl3 and sintered by heating with the heater 4 to convert it into a transparent glass (preform) 5.

Description

【発明の詳細な説明】 本発明は広い波長域でノｆルス分散を減少せしめた多モ
ードガラスファイバの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a multimode glass fiber with reduced Noflus dispersion over a wide wavelength range.

多モードガラスファイバのパルス分散は、伝搬する諸モ
ードの光の速度差に起因するモード分散によって決定さ
れる。したがってパルス分散の小さな光ファイバ全得る
ためには諸モードの伝搬速度が一致することが必要とな
る。この目的を達成するために多モードファイバのコア
内の屈折率分布は放物線に近い関数形に設定され、屈折
率分布ｎ（ｒ）は ｎｌ：コア中心屈折率 ａ：コア半径 Δ（λ）：コア、クラッド屈折率差 α：ノやラメータ とするときにノ卆ルス分散全最小とするパラメータαは １２　　　　　　　　明・・（２） α＝２−２Ｐ−ＴΔ（λ） で与えられる。ここで（２）式の２項と３項は元ファイ
バのガラス材質の物理特性が波長依存性葡するために導
入された補正係数である。（２）式かられかるように一
定のドーノ量ントを含む光７アイパについである波長で
のみ最小パルス分散を示す。この低パルス分散％性を広
波長域で得るためには、（２）式で与えられる最適パラ
メータαにおける波長依存性が小さなドーパントヲ使用
することが効果的である。従来石英ファイバ用のドーパ
ントとしてＧｅｍ、Ｂ、０３、Ｐ、０５が用いられ、波
長域帆８〜１．５μｍにおいてパラメータは夫々第１図
（図中、イｉｌ：Ｐ２Ｏ５、口ｉｊ：　Ｇｅｍ、、・・
ｔ４Ｂ２０ｓ　）に示すように２．１・−１，８、１，
７〜ｌ、５゜１．９５〜１９であり、ｐ、ｏ、が適して
いることがわかる。Pulse dispersion in a multimode glass fiber is determined by mode dispersion resulting from the difference in speed of light in propagating modes. Therefore, in order to obtain an optical fiber with small pulse dispersion, it is necessary that the propagation velocities of the various modes match. To achieve this purpose, the refractive index distribution in the core of the multimode fiber is set to a function shape close to a parabola, and the refractive index distribution n(r) is nl: Core center refractive index a: Core radius Δ(λ): When the core and cladding refractive index difference α is expressed as a parameter, the parameter α that minimizes the total nozzle dispersion is given by (2) α=2−2P−TΔ(λ). Here, the second and third terms in equation (2) are correction coefficients introduced to make the physical characteristics of the glass material of the original fiber wavelength dependent. As can be seen from equation (2), the optical 7-eyeper with a constant dose rate exhibits the minimum pulse dispersion only at a certain wavelength. In order to obtain this low pulse dispersion % over a wide wavelength range, it is effective to use a dopant with a small wavelength dependence in the optimum parameter α given by equation (2). Conventionally, Gem, B, 03, P, and 05 have been used as dopants for quartz fibers, and the parameters in the wavelength range of 8 to 1.5 μm are as shown in Figure 1 (in the figure, il: P2O5, ij: Gem, ,・・・
t4B20s) as shown in 2.1・-1,8,1,
It can be seen that p and o are suitable.

ところがＶＡＤ法あるいは外付は法によｐＰ２０．を含
む多孔質母材全作製しても、核多孔質母材の焼結時にＰ
２ｏ、は容易に揮散してプリフォームにけＰ２Ｏ５は残
留しない。However, the VAD method or external attachment is subject to pP20. Even if a complete porous base material including
2o is easily volatilized and no P2O5 remains in the preform.

そこで本発明はＰｚＯｉの揮散全抑止して残留せしめた
元ファイバ用プリフォーム′ｆ！：：製造する方法を提
供するもので、その構成は、ドーパント（！：　Ｌ　Ｔ
　Ｆ２０Ｂ　、　ＧｅＯ２、Ｂ２Ｏ３のうち少なくとも
一楯類の酸化物を含む５ｉ０２多孔質母材を、Ｐの化合
物を含む気体が存在する炉心管内で焼結させてオリ７オ
ームにすることを特徴とする。Therefore, the present invention has developed a preform for the original fiber that completely suppresses the volatilization of PzOi and allows it to remain. ::Provides a method for manufacturing, the composition of which is a dopant (!: L T
It is characterized in that a 5i02 porous base material containing at least one shield oxide among F20B, GeO2, and B2O3 is sintered in a furnace tube in which a gas containing a P compound is present to form an oxide of 7 ohm.

以下本発明を図面に示す一実施例に基づいて詳細に説明
する。The present invention will be described in detail below based on an embodiment shown in the drawings.

本発明に係る元ファイバ用ノリフオームの製造方法はｐ
ｇｏ、をドーパントの一部として含むようにするために
、多孔質母材の焼結をＰの化合物を廿む気体中で行なう
ようにしたものであシ、その一実施例を第２図に示す。The method for manufacturing the original fiber norifome according to the present invention is as follows:
In order to contain go as a part of the dopant, the porous base material was sintered in a gas containing a P compound. An example of this is shown in Figure 2. show.

ＶＡＤ法によシＰ２０Ｉがドーグされた５ｉ０２多孔質
母材１をシード俸２の先端に堆積させる。次に核多孔質
母材ｌを炉心管３内へ入れる。そして該炉心管３の外側
にはヒータ４が具えられ、前記多孔質母材１金回転させ
ながら核ヒータ４部全通過して焼結するとき多孔質母材
１が透明ガラス２（ｆす７オーム）に変わる。ここまで
は従来の製造方法と変わらないが、本発明に係る製造方
法はこの焼結時に前記炉心管３内部にＰの化合物全宮む
本実施例ではＰＯＣｌ、の気体とＨｅの気体が満たされ
る。以上のようにＰ−ｉ含む気体中で焼結が行なわれる
ことにより、多孔質母材中のＰ、０．は揮散が抑止され
、プリフォーム中にＰ、ｏ、　ｉ　残留せしめＰａ５６
にドーパントの一部として含む石英光ファイバを得るこ
とができる。A 5i02 porous base material 1 doped with P20I is deposited on the tip of the seed pellet 2 by the VAD method. Next, the core porous base material 1 is placed into the furnace core tube 3. A heater 4 is provided on the outside of the furnace core tube 3, and when the porous base material 1 is rotated and sintered by passing through the entire core heater 4, the porous base material 1 is sintered through the transparent glass 2 (f 7). ohm). Up to this point, the manufacturing method is the same as the conventional manufacturing method, but the manufacturing method according to the present invention is such that during sintering, the inside of the furnace tube 3 is completely filled with P compound, and in this embodiment, it is filled with POCl gas and He gas. . As described above, by performing sintering in a gas containing P-i, P in the porous base material is 0. The volatilization is suppressed and P, o, i remain in the preform.Pa56
It is possible to obtain a quartz optical fiber containing as part of the dopant.

かかる元ファイバ用プリフォームの製造方法によれば、
ノリ、７オーム中にＰｇＯｓｅドーパントの一部として
會むことかできるので、広い波長域で・母ルス分散を減
少せしめた石英光ファイバを得ることができる。According to this method of manufacturing a preform for an original fiber,
Since PgOse can be present as a part of the PgOse dopant in a 7-ohm conductor, it is possible to obtain a silica optical fiber with reduced flux dispersion in a wide wavelength range.

本発明において光ファイバのドーパントとしては、必ず
しもＰ２Ｏ５単独である必要はなく、ＧｅＯ２、Ｂ！Ｏ
８などの他のドー・ヤントとＰｇＯｓｋ混在せしめてＧ
ｅ０ａ　ｒ　ＢｚＯｓ　ｋドー・ヤントとして構成した
場合の元ファイバよりもパルス分散の波長特注依存性を
減少せしめることも可能である。In the present invention, the dopant for the optical fiber is not necessarily P2O5 alone, but GeO2, B! O
G
It is also possible to reduce the wavelength custom dependence of the pulse dispersion compared to the original fiber when configured as an e0a r BzOsk doant.

【図面の簡単な説明】[Brief explanation of the drawing]

第１（８）は各物質をドーパントとして含む光ファイバ
の使用波長に対するパラメータの関係を示すグラフでイ
はｐ、ｏ６、口はＧｅＯ２、−”はＢ２Ｏ３、第２図は
多孔質母材を焼結させてプリフォームにするときの説明
図である。 図面中 １は多孔質母材、 ２は／−ド棒、 ３は炉心管、 ４はヒータ、−， ５はプリフォーム であるっ ％許出願人　日本電値電話公社 住友電気工業株式会社The first (8) is a graph showing the relationship between the parameters and the wavelength used in an optical fiber containing each material as a dopant. This is an explanatory diagram of when the parts are tied together to make a preform. In the drawing, 1 is a porous base material, 2 is a /- rod, 3 is a furnace tube, 4 is a heater, and 5 is a preform. Applicant Nippon Electric Telephone Public Corporation Sumitomo Electric Industries, Ltd.

Claims (1)

【特許請求の範囲】[Claims] ドーｉ４ントとしてＰｚ　Ｏｓ　ｓ　ＧｅＯ２、ＢｓＯ
，のうち少なくとも一種類の酸化物を含むＳｉＯ□多孔
質母材を、Ｐの化合物を含む気体が存在する炉心管内で
焼結させてプリフォームにすることを特徴とする光フア
イバ用プリフォームの製造方法。Pz Os s GeO2, BsO as doant
An optical fiber preform characterized in that the preform is made by sintering a SiO□ porous base material containing at least one type of oxide among the above in a furnace tube in which a gas containing a P compound is present. Production method.
JP490582A 1982-01-18 1982-01-18 Production of preform for optical fiber Pending JPS58125621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP490582A JPS58125621A (en) 1982-01-18 1982-01-18 Production of preform for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP490582A JPS58125621A (en) 1982-01-18 1982-01-18 Production of preform for optical fiber

Publications (1)

Publication Number Publication Date
JPS58125621A true JPS58125621A (en) 1983-07-26

Family

ID=11596660

Family Applications (1)

Application Number Title Priority Date Filing Date
JP490582A Pending JPS58125621A (en) 1982-01-18 1982-01-18 Production of preform for optical fiber

Country Status (1)

Country Link
JP (1) JPS58125621A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60151242A (en) * 1984-01-17 1985-08-09 Shin Etsu Chem Co Ltd Manufacture of glass base material for optical transmission
EP0561371A2 (en) * 1992-03-17 1993-09-22 Sumitomo Electric Industries, Limited Method and apparatus for producing glass thin film
KR970002393A (en) * 1995-06-28 1997-01-24 패트리샤 에이. 버란져리 Improved Manufacturing Method of Planar Light Waveguide

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999709A (en) * 1973-01-04 1974-09-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999709A (en) * 1973-01-04 1974-09-20

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60151242A (en) * 1984-01-17 1985-08-09 Shin Etsu Chem Co Ltd Manufacture of glass base material for optical transmission
JPS638053B2 (en) * 1984-01-17 1988-02-19 Shinetsu Chem Ind Co
EP0561371A2 (en) * 1992-03-17 1993-09-22 Sumitomo Electric Industries, Limited Method and apparatus for producing glass thin film
EP0561371A3 (en) * 1992-03-17 1994-09-14 Sumitomo Electric Industries Method and apparatus for producing glass thin film
US5503650A (en) * 1992-03-17 1996-04-02 Sumitomo Electric Industries, Ltd. Method for producing a glass thin film with controlloing an oxide vapor of an additive
US5660611A (en) * 1992-03-17 1997-08-26 Sumitomo Electric Industries, Ltd. Method for producing glass thin film
KR970002393A (en) * 1995-06-28 1997-01-24 패트리샤 에이. 버란져리 Improved Manufacturing Method of Planar Light Waveguide

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