WO2011136324A1 - ガラス母材製造方法 - Google Patents
ガラス母材製造方法 Download PDFInfo
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- WO2011136324A1 WO2011136324A1 PCT/JP2011/060362 JP2011060362W WO2011136324A1 WO 2011136324 A1 WO2011136324 A1 WO 2011136324A1 JP 2011060362 W JP2011060362 W JP 2011060362W WO 2011136324 A1 WO2011136324 A1 WO 2011136324A1
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- WO
- WIPO (PCT)
- Prior art keywords
- glass
- base material
- starting
- tubular handle
- average density
- Prior art date
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- 239000011521 glass Substances 0.000 title claims abstract description 186
- 239000000463 material Substances 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000000151 deposition Methods 0.000 claims abstract description 38
- 230000008021 deposition Effects 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 18
- 238000007711 solidification Methods 0.000 claims abstract description 10
- 230000008023 solidification Effects 0.000 claims abstract description 10
- 239000010419 fine particle Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000002194 synthesizing effect Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 238000005352 clarification Methods 0.000 abstract description 3
- 239000007858 starting material Substances 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000011214 refractory ceramic Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Images
Classifications
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- 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
- 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
- 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]
- C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
-
- 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]
- C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
- C03B37/01473—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]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
Definitions
- the present invention relates to a method for producing a glass preform for an optical fiber.
- An optical fiber is manufactured by heating and softening one end of a substantially cylindrical glass base material and drawing. Moreover, the glass base material for optical fibers is manufactured by manufacturing methods, such as OVD method and MCVD method.
- Patent Document 1 discloses a glass base material manufacturing method by the OVD method.
- the glass base material manufacturing method disclosed in Patent Document 1 is intended to manufacture a glass base material for an optical fiber having a low moisture content.
- a glass particulate deposit is produced by depositing glass particulates on the outer periphery of a tubular handle into which the starting rod and the starting rod are inserted, and the starting rod is pulled out from the glass particulate deposit and extends in the axial direction.
- a glass fine particle deposit having a central hole penetrating therethrough is obtained. Then, the glass fine particle deposit is heated to dry and solidify, and the central hole is closed to produce a transparent glass base material.
- the starting member and the glass are aligned along the axial direction of the starting bar during the deposition step in which the glass particulates are deposited on the outer periphery of the starting member.
- the fine particle synthesis burner is relatively reciprocated to deposit glass fine particles on the outer periphery of the starting member from the tip of the starting rod to a part of the tubular handle to produce a glass fine particle deposit.
- the glass fine particle deposit may be broken and the yield of glass base material production may deteriorate.
- An object of the present invention is to provide a method capable of producing a glass base material with a high yield.
- the glass base material manufacturing method includes: (1) a fixing step in which a starting member is prepared by inserting and fixing the starting rod into the tubular handle so that the tip of the starting rod protrudes from one end of the tubular handle; 2) The starting member and the glass particle synthesizing burner are reciprocated relatively along the starting rod, and glass particles are deposited on the outer periphery of the starting member from the tip of the starting rod to a part of the tubular handle to make glass.
- a deposition step for producing a particulate deposit ; (3) a drawing step for pulling the starting rod from the tubular handle and the glass particulate deposit; and (4) heating the glass particulate deposit after the drawing step to produce a transparent glass tube.
- a transparentization step and (5) a solidification step of decompressing the inside of the transparent glass tube material and heating the transparent glass tube material to produce a solid glass base material.
- the average density of the glass particulate deposits deposited around the tubular handle is made larger than the average density of the glass particulate deposits deposited around the starting rod.
- the deposition step of the glass base material manufacturing method glass is deposited within a range of ⁇ 50 mm in the longitudinal direction with respect to the boundary position between the starting bar and the tubular handle from the start of deposition of the glass fine particles to the tenth layer. It is preferable that the amount of longitudinal change in the average density of the fine particle deposit is 0.01 g / cc / mm or less. From the beginning of the deposition of the glass fine particles to the 10th layer, the average density of the glass fine particle deposits deposited around the starting rod is 0.1 g / cc or more and 0.3 g / cc or less, and is deposited around the tubular handle.
- the average density of the glass fine particle deposit be 0.4 g / cc or more. Further, the average density of the glass particulate deposits deposited around the starting bar is set to 0.2 g / cc or more and less than 0.4 g / cc, and the average density of the glass particulate deposits deposited around the tubular handle is set to 0.3. It is preferable to set it as 4 g / cc or more.
- the average density of the glass fine particle deposit described above is a value obtained by dividing the weight of each part by the volume of each part in the glass fine particle deposit finally obtained in the deposition step.
- the average density of the glass fine particle deposits up to the 10th layer is a value obtained by dividing the weight of each part from the start of deposition to the 10th layer by the volume of each part.
- the glass base material manufacturing method according to the present invention can manufacture a glass base material with a high yield.
- FIG. 3 is a conceptual diagram illustrating a solidification step S5 of the glass base material manufacturing method of FIG.
- FIG. 1 is a flowchart of a glass base material manufacturing method according to an embodiment of the present invention.
- the glass base material manufacturing method of FIG. 1 manufactures a glass base material through a fixing step S1, a deposition step S2, a drawing step S3, a clarification step S4 and a solidification step S5 in order.
- the glass base material manufactured by this glass base material manufacturing method may be, for example, an optical fiber base material for manufacturing an optical fiber by drawing as it is, or of the optical fiber base materials.
- the core base material which should become a core part may be sufficient.
- FIG. 2 is a conceptual diagram illustrating a fixing step S1 of the glass base material manufacturing method of FIG.
- the starting rod 11 is inserted and fixed to the tubular handle 12 so that the tip end portion 11a of the starting rod 11 protrudes from the one end 12a of the tubular handle 12, thereby producing the starting member 10 (FIG. 2 (a), FIG. 2 (b)).
- the starting rod 11 is made of a material such as alumina, glass, refractory ceramics, or carbon.
- the tubular handle 12 is made of quartz glass.
- a carbon film 11b is preferably formed on the outer periphery of the part of the starting bar 11 protruding from the one end 12a of the tubular handle 12 in the starting member 10 by a flame from the burner 20 using a city gas burner or an acetylene burner. (FIG. 2 (c)). Even during the formation of the carbon film, the starting member 10 rotates about the central axis of the starting bar 11, and the burner 20 repeats reciprocating movement relative to the starting member 10 along the axial direction of the starting bar 11.
- FIG. 3 is a conceptual diagram illustrating the deposition step S2 of the glass base material manufacturing method of FIG.
- the starting member 10 is rotated about the central axis of the starting bar 11.
- the glass fine particle synthesizing burner 21 that is arranged on the side of the starting member 10 and forms an oxyhydrogen flame repeats reciprocating movement relative to the starting member 10 along the axial direction of the starting rod 11.
- glass particulates are deposited on the outer periphery of the starting member 10 from the distal end portion 11a of the starting rod 11 to a part of the tubular handle 12, thereby producing a glass particulate depositing body 13.
- the feed flow rate to the glass fine particle synthesis burner 21 is traversed (from the tip 11a of the starting bar 11 to a part of the tube handle 12, or from a part of the tube handle 12 to the tip of the starting bar 11). 11a)) every time.
- the glass particulate deposit on the outer periphery of the starting rod 11 has a predetermined composition distribution in the radial direction (that is, a refractive index distribution in the radial direction in the subsequent glass preform or optical fiber).
- FIG. 4 is a conceptual diagram illustrating the drawing step S3 of the glass base material manufacturing method of FIG.
- the starting bar 11 is drawn from the tubular handle 12 and the glass particulate deposit 13.
- the tubular handle 12 and the glass particulate deposit 13 remain fixed to each other. If a carbon film is formed on the outer periphery of the portion of the starting bar 11 protruding from the one end 12a of the tubular handle 12 in the fixing step S1, the glass particulate deposit 13 is obtained when the starting bar 11 is pulled out in the pulling step S3.
- the inner wall surface of the center hole is prevented from being scratched.
- FIG. 5 is a conceptual diagram illustrating the transparency step S4 of the glass base material manufacturing method of FIG.
- the glass fine particle deposit 13 is put into the heating furnace 22 into which He gas or Cl 2 gas is introduced together with the integral tubular handle 12, and is heated by the heater 23. Thereby, the transparent glass tube material 14 is produced.
- FIG. 6 is a conceptual diagram illustrating the solidification step S5 of the glass base material manufacturing method of FIG.
- the transparent glass tube material 14 is placed in a heating furnace and rotated, SF 6 is introduced into the center hole and heated by the heater 24, and the inner wall surface of the center hole is subjected to gas phase etching. (FIG. 6 (a)).
- the transparent glass tube 14 is decompressed and heated by the heater 24 to be solidified (FIG. 6B), thereby producing a solid glass base material.
- the transparent glass base material thus produced is further preformed by forming a cladding layer and making it transparent on the outside thereof. Furthermore, an optical fiber is manufactured by heating and softening the tip and drawing.
- the average density of the glass particulate deposits around the tubular handle 12 is made larger (harder) than the average density of the glass particulate deposits around the starting rod 11.
- the density of the glass particulates changes rapidly in the vicinity of the boundary between the starting bar 11 and the tubular handle 12, when the temperature in the vicinity of the boundary decreases (that is, away from the flame), the amount of expansion of the glass particulates increases. Since there is a difference, peeling (breaking) of the glass particles tends to occur near this boundary. Therefore, from the start of the deposition of the glass particulates to the 10th layer, the glass particulate deposits in a range within ⁇ 50 mm in the longitudinal direction with respect to the boundary position between the starting bar 11 and the tubular handle 12 (50 mm on both sides of the boundary position).
- the thickness is about 0.03 to 0.6 mm per layer, so 10 layers correspond to a thickness of about 0.3 to 6 mm. Usually, about 100 to 2000 layers of glass particles are deposited as a whole.
- the average density of the glass fine particle deposits around the starting rod 11 is set to 0.1 g / cc or more and 0.3 g / cc or less, and tubular.
- the average density of the glass fine particle deposit around the handle 12 is preferably 0.4 g / cc or more.
- the glass particulate deposits after the starting rod 11 is pulled out in the drawing step S3.
- the inner surface of the center hole is smoothed.
- the inner surface of the center hole of the transparent glass tube material after the transparentizing step S4 is also smoothed.
- the strength of the glass fine particle deposit cannot be maintained sufficiently.
- the tubular handle 12 and the surrounding glass particulate deposit that support the total weight of the glass particulate are supported. The adhesion and strength are increased, and the glass particles deposited around the starting bar 11 can be supported, and cracking is prevented.
- the average density of the glass particulate deposit around the tubular handle 12 is 0.4 g / cc or more, the adhesion with the tubular handle 12 is sufficient, and the glass particulate deposited around the starting rod 11 can be supported. it can.
- the inner surface of the central hole of the glass particle deposit after the starting bar 11 is extracted in the extracting step S3 becomes smooth. Therefore, the inner surface of the center hole is less likely to be scratched, so that the probability that the transparent glass tube breaks after the glass particulate deposit is made transparent or during the collapse of the transparent glass tube can be reduced.
- the density of the glass particles around the starting bar 11 may be less than 0.4 g / cc.
- the average density of the glass particulate deposit around the starting bar 11 is less than 0.2 g / cc, the strength of the glass particulate deposit cannot be maintained sufficiently, so the average density is 0.2 g / cc or more and 0 Less than 4 g / cc is preferable.
- Example 1 to 13 a glass base material for manufacturing a graded index optical fiber by drawing is manufactured.
- the deposition step S2 is performed using an OVD apparatus.
- the starting rod 11 is made of alumina having an outer diameter of 9 to 10 mm and a length of 1200 mm, and the tubular handle 12 is 600 mm in length, an outer diameter of 20 to 40 mm, and an inner diameter.
- a quartz glass of 9.8 to 21 mm is used.
- At the one end 12a of the tubular handle 12 a step of 0.5 mm is generated.
- the glass raw material gases introduced into the glass fine particle synthesis burner 21 forming the oxyhydrogen flame are SiCl 4 (input amount 1 to 3 SLM / piece) and GeCl 4 (input amount 0.0 to 0.3 SLM).
- the relative moving speed of the starting member 10 with respect to the glass fine particle synthesizing burner 21 is 3 to 1500 mm / min.
- the density of the glass particles to be deposited can be adjusted by increasing the hydrogen gas flow rate, decreasing the raw material gas flow rate, decreasing the relative movement speed of the glass particle synthesis burner 21 and the starting member 10, or the like. When the density is lowered, the reverse adjustment described above may be performed.
- a solidification step S5 is performed through a drawing step S3 and a transparency step S4.
- the transparent glass tube 14 is installed in a heating furnace, rotated at 30 rpm, and moved in the longitudinal direction of the transparent glass tube 14 at a speed of 5 to 20 mm / min. Heat to 2200 ° C.
- the heating means in the solidification step S5 may use a heat source such as a carbon heater or an electromagnetic induction coil heating element, or an oxyhydrogen burner.
- 50 to 100 sccm of SF 6 gas is caused to flow into the center hole of the transparent glass tube 14, and the inner wall surface of the center hole of the transparent glass tube 14 is vapor-phase etched.
- the transparent glass tube material 14 is decompressed to 0.1 to 10 kPa in the center hole, and is solidified at the same temperature as during the etching to produce a glass base material.
- the glass base material manufactured in this way is stretched to a desired diameter, and jacket glass is synthesized on the outer periphery thereof by the OVD method to manufacture a glass base material for an optical fiber.
- This glass preform for optical fiber is drawn to produce a graded index type multimode fiber.
- Table 1 shows the average density X (g / cc) of the glass particulate deposit around the starting bar 11 and the glass particulate deposition around the tubular handle 12 in each of Examples 1 to 13 and Comparative Example.
- the symbol “A” of the failure factor is a crack in the transparent glass tube (the average density X of the glass particulate deposit around the starting bar 11 is too high, the inner surface of the hole is scratched, and the glass particulate deposit is not cracked.
- the symbol “B” represents a crack in the glass particulate deposit.
- the good production rate ⁇ is 70% or more, and the glass has a high yield.
- a matrix can be produced.
- the average density X of the glass particulate deposit around the starting bar 11 is not less than 0.2 g / cc and less than 0.4 g / cc, and the average density Y of the glass particulate deposit around the tubular handle 12 is 0.4 g / cc. If it is cc or more, the good production rate ⁇ is 85% or more, and a glass base material can be produced with a high yield.
- the average density X of the glass particulate deposit around the starting rod 11 deposited from the beginning of the deposition of the glass particulates to the 10th layer is 0.1 g / cc or more and 0.3 g / cc or less, and the deposition of the glass particulates is started. If the average density Y of the glass particulate deposits around the tubular handle 12 deposited from the first to the tenth layer is 0.4 g / cc or more, the good production rate ⁇ is 75% or more, and the glass mother is high in yield. A material can be manufactured.
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Abstract
Description
実施例1~実施例13では、グレーデッドインデックス型の光ファイバを線引により製造するためのガラス母材が製造される。堆積工程S2は、OVD装置が用いられて行われ、出発棒11として、外径9~10mmで長さ1200mmのアルミナ製のもの、管状ハンドル12として、長さ600mm、外径20~40mm、内径9.8~21mmの石英ガラス製のものが使用される。管状ハンドル12の一端12aでは0.5mmの段差が生じている。
Claims (4)
- 出発棒の先端部が管状ハンドルの一端から突出するように前記出発棒を前記管状ハンドルに挿入し固定して出発部材を作製する固定工程と、
前記出発棒に沿って前記出発部材とガラス微粒子合成用バーナとを相対的に往復運動させ、前記出発棒の先端部から前記管状ハンドルの一部に亘って前記出発部材の外周にガラス微粒子を堆積させてガラス微粒子堆積体を作製する堆積工程と、
前記出発棒を前記管状ハンドルおよび前記ガラス微粒子堆積体から引き抜く引抜工程と、
前記引抜工程の後に、前記ガラス微粒子堆積体を加熱して透明ガラス管材を作製する透明化工程と、
前記透明ガラス管材の内部を減圧するとともに前記透明ガラス管材を加熱して中実のガラス母材を作製する中実化工程と
を備え、前記堆積工程において、前記出発棒の周囲に堆積されるガラス微粒子堆積体の平均密度より、前記管状ハンドルの周囲に堆積されるガラス微粒子堆積体の平均密度を大きくするガラス母材製造方法。 - 前記堆積工程において、ガラス微粒子の堆積開始から10層目までは、前記出発棒と前記管状ハンドルとの境界位置に対し長手方向の±50mm以内の範囲で堆積されるガラス微粒子堆積体の平均密度の長手変化量を0.01g/cc/mm以下とする請求項1に記載のガラス母材製造方法。
- 前記堆積工程において、ガラス微粒子の堆積開始から10層目までは、前記出発棒の周囲に堆積されるガラス微粒子堆積体の平均密度を0.1g/cc以上0.3g/cc以下とし、かつ前記管状ハンドルの周囲に堆積されるガラス微粒子堆積体の平均密度を0.4g/cc以上とする請求項1に記載のガラス母材製造方法。
- 前記堆積工程において、前記出発棒の周囲に堆積されるガラス微粒子堆積体の平均密度を0.2g/cc以上0.4g/cc未満とし、前記管状ハンドルの周囲に堆積されるガラス微粒子堆積体の平均密度を0.4g/cc以上とする請求項1に記載のガラス母材製造方法。
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US13/574,879 US8919153B2 (en) | 2010-04-30 | 2011-04-28 | Manufacturing method for glass base material |
CN201180008034.XA CN102741184B (zh) | 2010-04-30 | 2011-04-28 | 制造玻璃预制件的方法 |
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JP2010-105540 | 2010-04-30 | ||
JP2010105536A JP5778895B2 (ja) | 2010-04-30 | 2010-04-30 | ガラス母材製造方法 |
JP2010105540A JP2011230985A (ja) | 2010-04-30 | 2010-04-30 | ガラス母材製造方法 |
JP2010-105536 | 2010-04-30 |
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US20160257612A1 (en) * | 2015-03-04 | 2016-09-08 | Corning Incorporated | Coating of bait substrates for optical fiber making |
NL2015161B1 (en) * | 2015-07-13 | 2017-02-01 | Draka Comteq Bv | A method for preparing a primary preform by etching and collapsing a deposited tube. |
JP6694915B2 (ja) * | 2018-06-12 | 2020-05-20 | 株式会社フジクラ | 多孔質ガラス微粒子体の製造方法および光ファイバ母材の製造方法 |
CN115072985A (zh) * | 2022-06-13 | 2022-09-20 | 山东富通光导科技有限公司 | 一种解决大尺寸vad芯棒断裂的方法 |
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JPH02137742A (ja) * | 1987-08-05 | 1990-05-28 | Corning Glass Works | 光ファイバ・プリフォームの作成方法 |
JP2005170731A (ja) * | 2003-12-10 | 2005-06-30 | Sumitomo Electric Ind Ltd | マルチモード光ファイバ母材の製造方法、マルチモード光ファイバの製造方法、及びマルチモード光ファイバ |
JP2006151747A (ja) * | 2004-11-29 | 2006-06-15 | Furukawa Electric Co Ltd:The | 光ファイバの製造方法 |
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US4453961A (en) | 1982-07-26 | 1984-06-12 | Corning Glass Works | Method of making glass optical fiber |
JPH064492B2 (ja) * | 1987-02-24 | 1994-01-19 | 信越化学工業株式会社 | 光フアイバ用母材の製造方法 |
US5236481A (en) * | 1992-02-21 | 1993-08-17 | Corning Incorporated | Method of doping porous glass preforms |
JP4596442B2 (ja) | 1999-04-26 | 2010-12-08 | コーニング インコーポレイテッド | 低水分ピーク光導波路ファイバおよびその製造方法 |
US20040123630A1 (en) * | 2001-07-17 | 2004-07-01 | Arnab Sarkar | Preform fabrication process |
CN102583997B (zh) * | 2004-11-29 | 2015-03-11 | 古河电气工业株式会社 | 光纤母材、光纤母材的制造方法以及光纤的制造方法 |
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JPH02137742A (ja) * | 1987-08-05 | 1990-05-28 | Corning Glass Works | 光ファイバ・プリフォームの作成方法 |
JP2005170731A (ja) * | 2003-12-10 | 2005-06-30 | Sumitomo Electric Ind Ltd | マルチモード光ファイバ母材の製造方法、マルチモード光ファイバの製造方法、及びマルチモード光ファイバ |
JP2006151747A (ja) * | 2004-11-29 | 2006-06-15 | Furukawa Electric Co Ltd:The | 光ファイバの製造方法 |
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