JPH0316930A - Production of optical fiber having complicate refractive index distribution - Google Patents
Production of optical fiber having complicate refractive index distributionInfo
- Publication number
- JPH0316930A JPH0316930A JP14850389A JP14850389A JPH0316930A JP H0316930 A JPH0316930 A JP H0316930A JP 14850389 A JP14850389 A JP 14850389A JP 14850389 A JP14850389 A JP 14850389A JP H0316930 A JPH0316930 A JP H0316930A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- glass
- refractive index
- glass tube
- 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
- 238000009826 distribution Methods 0.000 title claims abstract description 12
- 239000013307 optical fiber Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000011521 glass Substances 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000010419 fine particle Substances 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 15
- 239000010453 quartz Substances 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 abstract description 8
- 238000005137 deposition process Methods 0.000 abstract 3
- 239000004071 soot Substances 0.000 abstract 2
- 239000011261 inert gas Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004017 vitrification Methods 0.000 description 5
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007858 starting material 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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
- C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
-
- 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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
-
- 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
- C03B37/01493—Deposition substrates, e.g. targets, mandrels, start rods or tubes
-
- 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
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/36—Dispersion modified fibres, e.g. wavelength or polarisation shifted, flattened or compensating fibres (DSF, DFF, DCF)
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、分散フラットファイバのような複雑屈折率
分布を有する光ファイバの製造方法に関するもので、光
学的特性の向上ならびに生産性の向上を図ったものであ
る。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method of manufacturing an optical fiber having a complex refractive index distribution such as a dispersion flat fiber, which improves optical characteristics and productivity. It was planned.
（従来の技術）
？来のこの種のファイバの屈折率分布として例えば第５
、６、７図に示すものが知られている。そしてこれらの
場合、中心コアおよびその外側に位置する高屈折率部分
における屈折率の調整はＳｉＯ■にＧｅＯ■をドーブす
ることで行い、両者の間の低屈折率部分における屈折率
の調整は純粋Ｓｉｎ■かもしくはＳｉＯ■にＦをドーブ
することで対応している。(Conventional technology)? For example, the refractive index distribution of this type of fiber in the past is
, 6 and 7 are known. In these cases, the adjustment of the refractive index in the central core and the high refractive index part located outside it is done by doping SiO■ with GeO■, and the adjustment of the refractive index in the low refractive index part between the two is done by pure doping. This is handled by doping F into Sin■ or SiO■.
しかしながら、その製造方法はいずれの場合においても
最終的にコアとなる透囮ガラスロツドの回りに外付け法
により順次所定の屈折率、所定の厚さを有するガラス微
粒子層を積層させ、次いでこのガラス微粒子層を透明ガ
ラス化してブリフォームとなし、このブリフォームを一
端から溶融線引きして所望の複雑屈折率分布を有するフ
ァイバとするものである。However, in any case, the manufacturing method is to sequentially laminate layers of glass fine particles having a predetermined refractive index and a predetermined thickness around a transparent glass rod, which ultimately becomes the core, by an external method. The layer is made into a transparent vitrification to form a preform, and this preform is melt-drawn from one end to form a fiber having a desired complex refractive index distribution.
（発明が解決しようとする課題）
ところがこの方法では屈折率の異なる各ガラス層はガラ
ス微粒子層を経て形成されるため、カサ密度のバラツキ
等により必ずしもその厚さを所定のものとするのは困難
であり、得られるファイバの分散特性にばらつきが生し
るという問題があった。また、得られるファイバの特性
は最終ブリフォームの状態になって始めて判断しつるた
め、製造途中で不具合であっても最後まで作るというこ
とになってしまい生産性の点で問題があった。(Problem to be Solved by the Invention) However, in this method, each glass layer with a different refractive index is formed through a glass fine particle layer, so it is difficult to always maintain a predetermined thickness due to variations in bulk density, etc. Therefore, there was a problem in that the dispersion characteristics of the obtained fibers varied. Furthermore, since the properties of the resulting fiber can only be determined after it is in the final preformed state, even if there is a problem during production, the process must be continued until the end, which poses a problem in terms of productivity.
（課題を解決するための手段）
この発明は、以上の観点から分散特性の安定したこの種
ファイバを生産性良く得る方法を提供するもので、その
特徴とするところは高純度石英系ガラス管の外周に、外
付け法により前記ガラス管の屈折率よりも低い屈折率の
ガラス微粒子層を堆積させ、次いでこのガラス管を均一
加熱炉内に収容し、管内に内圧をかけつつ前記ガラス微
粒子層を透明ガラス化し、しかるのち管内にコア−クラ
ッド型の透明な石英系ガラスロンドを挿入してロッド−
イン−チューブ法によりファイバ化することにある。(Means for Solving the Problems) From the above points of view, the present invention provides a method for obtaining this type of fiber with stable dispersion characteristics with high productivity. A glass fine particle layer having a refractive index lower than that of the glass tube is deposited on the outer periphery by an external method, and then this glass tube is placed in a uniform heating furnace, and the glass fine particle layer is heated while applying internal pressure inside the tube. It is made into transparent glass, and then a core-clad type transparent quartz glass iron is inserted into the tube to form a rod.
The purpose is to make the fiber into a fiber using the in-tube method.
なお、この発明において、ガラス管内に内圧をかけつつ
、その回りに形成されたガラス微粒子層を透明ガラス化
するのは、その際の加熱によってガラス管が半径方向お
よび長さ方向に収縮し、予め設定した寸法が狂い所定の
径比が得られなくなるのを防止するためである。高純度
石英系ガラス管内に内圧をかける手段としては、例えば
ガラス管の開放端の一方を閉しるか、もしくは縮径して
細孔になし、他方からＡｒ等のガスを送込む等が挙げら
れ、その際のガラス管内圧とその回りに位置される炉心
管内圧との差圧の程度はガラス管の軟化温度が１４００
〜１５５０℃程度の場合、２〜２ ０ ｍｍａｑ程度と
される。In addition, in this invention, the glass fine particle layer formed around the glass tube is transformed into transparent vitrification while applying internal pressure inside the glass tube. This is to prevent the set dimensions from going out of order and making it impossible to obtain a predetermined diameter ratio. Examples of means for applying internal pressure inside the high-purity quartz glass tube include closing one of the open ends of the glass tube or reducing the diameter to form a pore, and introducing a gas such as Ar from the other side. At that time, the degree of differential pressure between the internal pressure of the glass tube and the internal pressure of the reactor core tubes located around it is such that the softening temperature of the glass tube is 1400°C.
When the temperature is about 1550°C, it is about 2 to 20 mmaq.
（作用）
最外層のみを外付け法により得るとともに、この外付け
法により得られたガラス微粒子層の透明ガラス化に際し
ては、ガラス管を均一炉内に入れて、ガラス管内に内圧
をかけつつ行うようにしたので全ての層を外付け法で形
成することによる寸法制御性の低下、ならびにガラス管
の収縮による寸法のズレが防止され予め設定したとおり
のものとなる。(Function) Only the outermost layer is obtained by the external coating method, and when the glass fine particle layer obtained by this external coating method is turned into transparent vitrification, the glass tube is placed in a uniform furnace and internal pressure is applied inside the glass tube. This prevents deterioration in dimensional controllability due to forming all layers by the external attachment method, as well as dimensional deviations due to shrinkage of the glass tube, and achieves the preset values.
（実施例）
？径１ ５ ｍｍ ． 外径２ ０ ｍｍのＧｅ０
２ドーブＳｌ０２（△＝０．２％）の高純度ガラス管を
６ Ｏ ｒｐｍで回転させつつ、このガラス管に直交し
て酸水素バナを対峙させ、バーナ内にＨ２１０ ｆ２
／分、ｏ２ｌ８℃／分、ＳｉＣｌ＜ ４ ０ ０ ｃｃ
／分、カーテンガスとしてＡｒを８ ０ ０ ｃｃ／分
供給させつつ、ガラス管の軸方向に添って２ ０ ｍｍ
／分の速度でトラバースさせて、ＳｉＯ■からなるガラ
ス微粒子層を積層さぜて外径１ ０ ０ ｍｍとした。(Example) ? Diameter 15 mm. Ge0 with outer diameter 20 mm
While rotating a 2-dove Sl02 (Δ=0.2%) high-purity glass tube at 6 O rpm, an oxyhydrogen burner was placed perpendicularly to the glass tube, and H210 f2 was placed inside the burner.
/min, o2l8℃/min, SiCl<400cc
20 mm along the axial direction of the glass tube while supplying Ar at 800 cc/min as a curtain gas.
By traversing at a speed of /min, glass fine particle layers made of SiO2 were laminated to have an outer diameter of 100 mm.
このガラス微粒子層が形成されたガラス管を第１図に示
す装置を用いて脱水、透明ガラス化した。図において、
１はＧｅｏ２ドーブＳｉＯ■ガラス管、２はその上に形
成されたＳｉｎｇからなるガラス微粒子層である。そし
て、ガラス管１の一方の開放端は後述するガラス微粒子
層２の透明ガラス化のために予め酸水素炎で加熱されて
つぶされている。３はガラス管１内に内圧をかけるため
のガス供給管でバイパス４を備えている。５はこのガス
供給管３とガラス管１の開放端とを接続するコネクタで
ある。６は均一加熱炉で、ガラス微粒子層２を長さ方向
に均一に加熱す？ためにガラス微粒子層２よりも十分に
長い発熱体７を備えている。８は発熱体７内に位置され
た石英炉心管で、一端は閉しられ、他端には蓋９が取付
けられており、この蓋９の中心口にガラス管１が挿通さ
れて、ガラス微粒子層２を有ずるガラス管１が石英炉心
管８内に収容される。１０は石英炉心管８の側面に設け
られたガス供給口、１）は石英炉心管８の一端に設けら
れたガス排出口である。The glass tube on which the glass fine particle layer was formed was dehydrated and made into transparent vitrification using the apparatus shown in FIG. In the figure,
1 is a Geo2-doped SiO2 glass tube, and 2 is a glass fine particle layer made of Sing formed thereon. One open end of the glass tube 1 is previously heated and crushed with an oxyhydrogen flame in order to make the glass fine particle layer 2 transparent, which will be described later. 3 is a gas supply pipe for applying internal pressure inside the glass tube 1, and is provided with a bypass 4. A connector 5 connects the gas supply pipe 3 and the open end of the glass tube 1. 6 is a uniform heating furnace that heats the glass fine particle layer 2 uniformly in the length direction. Therefore, the heating element 7 is provided which is sufficiently longer than the glass fine particle layer 2. Reference numeral 8 denotes a quartz furnace core tube located inside the heating element 7, one end of which is closed and a lid 9 attached to the other end. A glass tube 1 with a layer 2 is housed in a quartz furnace tube 8 . 10 is a gas supply port provided on the side surface of the quartz furnace tube 8; 1) is a gas discharge port provided at one end of the quartz furnace tube 8.
以上の構成において、炉心管８内にガス供給口１０から
塩素ガスを供給するとともにその内部温度を１０００゜
Ｃに維持して１時間熱処理してガラス微粒子層を脱水し
た。次に石英炉心管８内にガス供給口１０からＨｅガス
を流すとともにその内部温度を１５５０°Ｃに上げた。In the above configuration, chlorine gas was supplied into the furnace core tube 8 from the gas supply port 10, and the internal temperature was maintained at 1000° C., and heat treatment was performed for 1 hour to dehydrate the glass fine particle layer. Next, He gas was flowed into the quartz furnace tube 8 from the gas supply port 10, and the internal temperature was raised to 1550°C.
一方、ガラス管１内にＡｒガスを供給して管内圧力を２
０ ｍｍａｑに維持した。２時間後ガラス管１を取出
したところ、ＳｉＯ■ガラス微粒子層２は完全に透明ガ
ラス化されており、その厚さは１ ５ ｍｍであった。On the other hand, Ar gas is supplied into the glass tube 1 to reduce the pressure inside the tube to 2.
It was maintained at 0 mmaq. When the glass tube 1 was taken out after 2 hours, the SiO2 glass fine particle layer 2 was completely transformed into transparent glass, and its thickness was 15 mm.
またガラス管１は収縮しておらず最初の内径を維持して
いた。Furthermore, the glass tube 1 did not shrink and maintained its initial inner diameter.
？予めＶＡＤ法により若干のクラッド部を持つＧＩ型で
、コアとなる部分の直径がｌ Ｏ ｍｍおよび比屈折率
差Δが０．８％のＧｅＯ■−ＳｉＯｚガラス、クラッド
となる部分の厚さが１．５ ｍｍ、コアとなる最外部の
屈折率との比屈折率差が−０．４％のＦドーブＳｉ０２
ガラスロッドを用意した。そして透明ガラス化を終え炉
内から取出された前記ガラス管ｌ内にこの日ッドを収容
し、両者の隙間にＳＦ．を１Ｉ２／分、０■５ ０ ０
ｃｃ／分流しながら外部から酸水素炎で加熱して溶融
一休化して光ファイバ母材とした。得られた母材の屈折
率分布を測定したところ第２図のごとくであった。この
母材を一端から溶融線引きして直径１２５μｍのファイ
バとしたところ第３図に示す広帯域で低分散のファイバ
が得られた。またその損失波長特性を調べたところ第４
図に示すように低損失のものであった。? GeO■-SiOz glass with a slight cladding part formed by the VAD method in advance, the diameter of the core part is 10 mm and the relative refractive index difference Δ is 0.8%, and the thickness of the cladding part is F-dove Si02 with a thickness of 1.5 mm and a relative refractive index difference of -0.4% from the refractive index of the outermost part that becomes the core.
Prepare a glass rod. After transparent vitrification, the glass tube 1 was taken out from the furnace, and the glass tube 1 was taken out. 1I2/min, 0■5 0 0
The mixture was heated from the outside with an oxyhydrogen flame while flowing at cc/split to melt and temporarily suspend the melting process to obtain an optical fiber base material. When the refractive index distribution of the obtained base material was measured, it was as shown in FIG. When this base material was drawn from one end into a fiber having a diameter of 125 μm, a broadband and low dispersion fiber as shown in FIG. 3 was obtained. In addition, when we investigated the loss wavelength characteristics, we found that
As shown in the figure, the loss was low.
因みに、従来の方法で第３図に示す程度にまで広帯域で
低分散のファイバを得るためにはブリフ才一ムを３〜４
本つくって初めて得ることができる。Incidentally, in order to obtain a fiber with a wide band and low dispersion as shown in Fig. 3 using the conventional method, the brief efficiency must be 3 to 4.
You can only get it by writing a book.
（発明の効果）
この発明は、以上のように複雑屈折率分布を有するファ
イバを得るに際し、出発部材として高純度ガラス管を用
意し、寸法制御の困難なガラス微粒子層の形成はこのガ
ラス管の回りの層だけとし、その透明ガラス化に当たっ
てはガラス管が収縮しないように管内に内圧をかけつつ
行うようにしたので、寸法制度の優れた母材が得られ、
以って分散特性に優れたファイバを得ることができる。(Effects of the Invention) In order to obtain a fiber having a complex refractive index distribution as described above, the present invention prepares a high-purity glass tube as a starting material, and forms a glass fine particle layer whose size is difficult to control using this glass tube. Only the surrounding layer was used, and the process of making it transparent was done while applying internal pressure inside the glass tube to prevent it from shrinking, so a base material with excellent dimensional accuracy was obtained.
Therefore, a fiber with excellent dispersion characteristics can be obtained.
また、この発明方法によると寸法制度の優れた母材を高
確率で得ることができるので歩留りが向上し、以って生
産性の向上を図ることができるという副次的効果が得ら
れる。Further, according to the method of the present invention, a base material with excellent dimensional accuracy can be obtained with a high probability, so that the yield is improved, and the secondary effect is that productivity can be improved.
第１図はこの発明の方法の一行程を示す説明図、第２図
は、この発明の方法によって得られた光ファイバ母材の
屈折率分布図、第３図は、この発明の方法によって得ら
れた光ファイバの分散波長特性図、第４図はこの発明方
法によって得られた光ファイバの損失波長特性図、第５
〜７図は複雑屈折率分布ファイバの屈折率分布図。FIG. 1 is an explanatory diagram showing one step of the method of the present invention, FIG. 2 is a refractive index distribution diagram of the optical fiber preform obtained by the method of the present invention, and FIG. Figure 4 shows the dispersion wavelength characteristic diagram of the optical fiber obtained by the method of this invention, and Figure 5 shows the loss wavelength characteristic diagram of the optical fiber obtained by the method of the present invention.
Figures 7 to 7 are refractive index distribution diagrams of complex refractive index distribution fibers.
Claims (1)
前記ガラス管の屈折率よりも低い屈折率のガラス微粒子
層を堆積させ、次いでこのガラス管を均一加熱炉内に収
容し、管内に内圧をかけつつ前記ガラス微粒子層を透明
ガラス化し、しかるのち管内にコア−クラッド型の透明
な石英系ガラスロッドを挿入してロッド−イン−チュー
ブ法によりファイバ化することを特徴とする複雑屈折率
分布を有する光ファイバの製造方法。(1) A layer of glass fine particles having a refractive index lower than that of the glass tube is deposited on the outer periphery of a high-purity quartz-based glass tube by an external method, and then this glass tube is placed in a uniform heating furnace, and inside the tube. The complex refraction method is characterized in that the glass fine particle layer is made into transparent glass while applying internal pressure to the tube, and then a core-clad type transparent quartz glass rod is inserted into the tube to make it into a fiber by the rod-in-tube method. A method of manufacturing an optical fiber having a rate distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14850389A JPH0316930A (en) | 1989-06-13 | 1989-06-13 | Production of optical fiber having complicate refractive index distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14850389A JPH0316930A (en) | 1989-06-13 | 1989-06-13 | Production of optical fiber having complicate refractive index distribution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0316930A true JPH0316930A (en) | 1991-01-24 |
Family
ID=15454218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14850389A Pending JPH0316930A (en) | 1989-06-13 | 1989-06-13 | Production of optical fiber having complicate refractive index distribution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0316930A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0835227A1 (en) * | 1996-04-29 | 1998-04-15 | Corning Incorporated | Method of making optical fibers |
| WO2001032572A1 (en) * | 1999-11-02 | 2001-05-10 | Heraeus Quarzglas Gmbh & Co. Kg | Method for producing a quartz glass blank for optical waveguides and quartz glass blank produced according to this method |
| EP1496023A1 (en) * | 2002-04-16 | 2005-01-12 | Sumitomo Electric Industries, Ltd. | Optical fiber preform producing method, optical fiber producing method, and optical fiber |
| JP2007292758A (en) * | 2006-04-24 | 2007-11-08 | Verigy (Singapore) Pte Ltd | Device, system, and method for processing signal between tester and plurality of devices to be tested by one-time touchdown of probe at high temperature |
| WO2012163644A1 (en) * | 2011-05-27 | 2012-12-06 | J-Plasma Gmbh | Method for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending |
-
1989
- 1989-06-13 JP JP14850389A patent/JPH0316930A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0835227A1 (en) * | 1996-04-29 | 1998-04-15 | Corning Incorporated | Method of making optical fibers |
| EP0835227A4 (en) * | 1996-04-29 | 1998-08-19 | Corning Inc | Method of making optical fibers |
| WO2001032572A1 (en) * | 1999-11-02 | 2001-05-10 | Heraeus Quarzglas Gmbh & Co. Kg | Method for producing a quartz glass blank for optical waveguides and quartz glass blank produced according to this method |
| EP1496023A1 (en) * | 2002-04-16 | 2005-01-12 | Sumitomo Electric Industries, Ltd. | Optical fiber preform producing method, optical fiber producing method, and optical fiber |
| EP1496023A4 (en) * | 2002-04-16 | 2011-06-22 | Sumitomo Electric Industries | Optical fiber preform producing method, optical fiber producing method, and optical fiber |
| JP2007292758A (en) * | 2006-04-24 | 2007-11-08 | Verigy (Singapore) Pte Ltd | Device, system, and method for processing signal between tester and plurality of devices to be tested by one-time touchdown of probe at high temperature |
| WO2012163644A1 (en) * | 2011-05-27 | 2012-12-06 | J-Plasma Gmbh | Method for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending |
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