CN100395203C - Method for preparing preformod of optical fiber with low water peak in large size - Google Patents
Method for preparing preformod of optical fiber with low water peak in large size Download PDFInfo
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- CN100395203C CN100395203C CNB2005100193043A CN200510019304A CN100395203C CN 100395203 C CN100395203 C CN 100395203C CN B2005100193043 A CNB2005100193043 A CN B2005100193043A CN 200510019304 A CN200510019304 A CN 200510019304A CN 100395203 C CN100395203 C CN 100395203C
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- optical fiber
- plug
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- water peak
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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
- C03B37/01205—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
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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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01228—Removal of preform material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The present invention relates to a method for manufacturing a large size low water peak optical fiber prefabricated rod, which comprises the following processes: (1) a core rod of which the b/a value is more than or equal to 2.0 and is less than or equal to 3.8, and the c/a value is more than or equal to 2.5 and is less than or equal to 6; (2) one section or multiple sections of the core rod are inserted into a small sleeve tube; the outer surface of the core rod and the inner surface of the small sleeve tube are corroded by fluoric gases and auxiliary gases on a stretching tower; the core rod and the small sleeve tube are melted and shrunk together for obtaining a combined core rod; (3) the surface of the combined core rod has HF acid corrosion; the corrosion amount is calculated according to the corrosion depth, and requires not less than 0.05mm. After the combined core rod is cleaned and dried, one section or multiple sections of the combined core rod are inserted into a big sleeve tube so as to be combined into the large size low water peak optical fiber prefabricated rod which is used for wiredrawing. The present invention has the advantages of simple production process and low production cost, and is particularly suitable for producing the large size low water peak optical fiber prefabricated rod in a large range.
Description
Technical field
The present invention relates to a kind of manufacture method of preform, specifically a kind of manufacture method of preformod of optical fiber with low water peak in large size.
Background technology
In Optical Fiber Transmission,, limited the use of optical fiber at this window owing to the existence of hydroxyl (OH) absorption peak (being called as the water peak) in 1360nm～1460nm scope.Therefore in order to make optical fiber in all wave band scope, just must eliminate the water peak influence of this wave band, such optical fiber is commonly referred to as " low-water-peak fiber " or " allwave fiber ".
After low-water-peak fiber in 1998 emerged, each big fiber manufacturers was studied the manufacturing technology of low-water-peak fiber one after another.Along with the reduction at water peak, when each major company constantly is optimized the low-water-peak fiber performance, also doing one's utmost to reduce the optical fiber cost, in the hope of in intense market competition, obtaining bigger initiative.Large-scale optical fiber prefabricating stick, the wire drawing of single prefabricated rods can reach thousands of kilometers, have improved production efficiency greatly, are to reduce comparatively effective ways of optical fiber cost at present.The preform manufacturing process generally all adopts two step method, promptly makes plug earlier, adopts different technology to make surrounding layer at mandrel outer then.Typical plug manufacture method has following four kinds: modified chemical vapor deposition method (MCVD), plasma enhanced chemical vapor deposition method (PCVD), pipe outside vapor deposition (OVD) and axial vapor deposition method (VAD).The surrounding layer manufacturing technology mainly contains tiretube process, external sediment method and plasma spraying process.Wherein tiretube process is plug to be inserted form preform in the quartz glass sleeve.Because sleeve pipe can adopt the manufacturing of OVD method, its dehydration technique is very ripe, and can make large-sized sleeve pipe, and tiretube process is to make preformod of optical fiber with low water peak in large size method preferably at present.Thereby for the manufacturing of preformod of optical fiber with low water peak in large size, its gordian technique is the design and the manufacturing of plug.
Making large size sleeve pipe (120 millimeters～200 millimeters of diameters, long 2～3 meters) time, in order to bear bigger weight, target rod size can not be too small, thereby large size telescopic internal diameter is subjected to certain restriction thus, generally all greater than 45 millimeters, in order to guarantee that optical fiber has good how much, as core circularity and core concentricity, require the gap between plug and sleeve pipe not too big, for sedimentation (MCVD and PCVD) in the pipe, be subjected to the restriction of bushing pipe size, can't directly make the plug of big external diameter preform; For pipe external sediment method (VAD and OVD) method, though be not subjected to the restriction of bushing pipe, directly make the plug of big external diameter, cost is higher, can't embody the advantage that adopts sleeve technology to make large size prefabricated rod.In order to address this problem, can between plug and sleeve pipe, increase a gap sleeve pipe, together with plug and sleeve-assembled to after wire drawing again.United States Patent (USP) 6460378B1 has introduced this method.But, this with the gap sleeve pipe with plug and sleeve-assembled to back together directly the stringy method make technology be tending towards complicated, and increased an interface newly, make the cleaning and the drying at interface become strict more, intensity and water peak to optical fiber often produce adverse influence, cause production cost than higher simultaneously.
Another solution adopts plug " compression " technology to increase the size of plug.So-called compression process is to apply mechanical forces compress to (generally be greater than 2000 ℃) under comparatively high temps along the plug axial direction due, thereby obtains larger-diameter plug.European patent EP 1156018 A1 and U.S. Pat 6,553,790 B1 disclose so a kind of technology, and heating makes it softening to plug, apply drawing force or pressure then to obtain the plug of different diameter.Chinese invention patent application 03124114.X discloses similar techniques, adjusts drawing force or force of compression according to the diameter Distribution of prefabricated rods, to improve the homogeneity of prefabricated rods diameter.Chinese invention patent application 200310102706.0 introduced MCVD is molten contract after, along y direction compression plug, it is short but the bigger plug of diameter places the sleeve pipe wire drawing to such plug then to make length.But these methods, all be that plug is handled, in the treating processes, thermal source (oxyhydrogen flame, electrical heater and plasma body) can cause that unavoidably some impurity (as OH and metallic impurity) pollute, because the mandrel outer surface is very near from fuse, impurity very easily is diffused into sandwich layer, thereby causes the increase of optical fiber attenuation.Notion for large size prefabricated rod, not only to refer to how many external diameters will reach, also require prefabricated rods to have certain length, what emphasize is the drawn fiber lengths (generally being greater than 1000 kilometers) of single prefabricated rods, and for the length that how to increase plug, the solution that above-mentioned patent does not all provide.The existing method that increases plug length generally is will lack plug by the method for heating directly to connect.Experiment shows, will lack plug and directly connect, and no matter adopts which kind of thermal source, and as thermal source, the water peak of optical fiber all can increase near the joint, influences the output efficiency of low-water-peak fiber greatly as flame passes.
For conveniently introducing content of the present invention, the definitional part term:
Plug: the prefabricated component that contains sandwich layer and part covering.
CSA: cross-sectional area, unit are mm
2
Small casing: the little CSA purity quartz glass pipe for high that meets certain how much requirements.
Big sleeve pipe: the big CSA purity quartz glass pipe for high that meets certain how much requirements.
Rod stop: support plug in small casing so that the quartz glass bar that plug does not relatively move.
Combination plug: the molten formed prefabricated component in back together that is reduced to of plug and small casing.
RIT technology: plug inserted form preform in the sleeve pipe.
RIC technology: will make up plug and insert the large-scale optical fiber prefabricating stick of being formed in the big sleeve pipe.
B/a value: the ratio that is defined as sedimentary sagging cladding diameter and sandwich layer diameter in pipe.
C/a value: the ratio that is defined as diameter of mandrel and sandwich layer diameter.
D/a value: the ratio that is defined as combination diameter of mandrel and sandwich layer diameter.
Summary of the invention
Technical problem to be solved by this invention is: a kind of manufacture method of preformod of optical fiber with low water peak in large size is provided, thus method can the scale operation low cost, the optical fiber at low water peak.
Technical scheme of the present invention is achieved in that (1) at first prepares plug, plug can adopt arbitrary technology obtained, be generally modified chemical vapor deposition method (MCVD), fluid by outside-tube chemical vapor deposition method (OVD), axial vapor deposition method (VAD) and plasma enhanced chemical vapor deposition method (PCVD) plug, require 2.0≤b/a value≤3.8,2.5≤c/a value≤6 of plug, adopt purity quartz glass pipe for high as sleeve pipe.(2) preparation of combination plug is inserted one or more snippets plug in small casing, on the stretching tower earlier with fluorine-containing gas (as Freon C
2F
6And SF
6Deng) and assist gas (as O
2, He) mandrel outer surface and small casing internal surface are corroded, with its molten being reduced to together, can also compress it simultaneously then, obtain making up plug.(its cross section as shown in Figure 1).(3), the preparation of preform, will make up mandrel surface HF acid corrosion, etching extent is by depth of corrosion, requirement is not less than 0.05mm, behind the cleaning-drying, multistage is made up plug insert in the big sleeve pipe, be combined into and supply the stringy preformod of optical fiber with low water peak in large size.
Combination plug manufacturing process involved in the present invention and equipment are as shown in Figures 2 and 3, at first select high purity quartz small casing 5 for use and connect and prolong pipe 2, because small casing and plug sandwich layer are very near, therefore need select the lower quartz material of hydroxy radical content for use, the general requirement hydroxy radical content is less than 1000ppb, further require less than 100ppb, further require less than 10ppb, the size of small casing is will guarantee to make up plug to satisfy 4.3≤d/a value≤8,, allow sandwich layer away from big sleeve pipe to eliminate big sleeve pipe and big sleeve pipe and combination plug interface to the optical fiber attenuation especially influence at water peak.The small casing that prolongs is assembled into (as shown in Figure 2) together with one or more snippets plug 4, Rod stop3 and plug 1 behind cleaning-drying behind cleaning-drying; On the excellent stretching tower that is installed to as shown in Figure 3 of this combination, the stretching tower mainly is made up of chuck 11 and support moving up and down 8, electrical heater moving up and down 10, supplied gas system 6 and the pressure control system 7 etc. of pylon 9, rotation.After will making up rod and being installed on the stretching tower, connect airing system and pressure control system, check sealing property earlier, confirm that sealing is no problem after, electrical heater is heated up, and begins logical fluorine-containing gas and assist gas (as O
2, He), the temperature of process furnace is generally at 1600-2200 ℃, and speed is 40-60mm/min, and pipe internal pressure-100pa get final product to+100pa, and etching extent depends primarily on gas flow, electrical heater temperature and speed and corrodes time number.Etching extent requires to be not less than 20u by depth of corrosion.After corroding, wash away 1-2 time with assist gas, be reduced to together plug and small casing are molten then, the travel direction of stove is for from top to bottom during molten contracting.Fluorine-containing gas is (as Freon C
2F
6And SF
6Deng) water-content require less than 1000ppb, further requiring is less than 100ppb, further requiring is less than 10ppb.Assist gas is (as O
2, He) hydroxy radical content in requires less than 100ppb, and further requiring is less than 10ppb, and further requiring is less than 1ppb, and the big horizontal area requirements that connects of telescopic is at 9600mm-230000mm
2, can draw the optical fiber of 125u with the large size prefabricated rod of guaranteeing unit length is more than the 900km.
With plug and small casing molten be reduced to together in or afterwards, also can compress it, obtain can with the combination plug of bigger sleeve pipe coupling, as being can obtain the prefabricated rod mandrel that diameter is 150mm after the plug compression of prefabricated rods of 80mm with diameter.In addition, also can improve the longitudinal uniformity of core diameter.For compression process, needing the parameter of control is the translational speed V of chuck
C, stove translational speed V
FAnd electrical heater temperature T.The temperature T of electrical heater is controlled at 2100 ± 50 ℃, the translational speed V of chuck
CTranslational speed V with stove
FAs follows:
V
C＝V
F[1-(A
2/a
2)] (1)
In the formula (1), A is the core diameter after compressing, and a is original core diameter, with the translational speed V of stove
FFor just, during compression, the travel direction of chuck is opposite with the travel direction of stove, so the translational speed V of chuck
CFor negative, the translational speed V of chuck
CCan determine according to formula (1).
In order to prevent in stretching tower treating processes, the electrical heater volatile matter deposit to the combination mandrel surface or even be diffused in it, thereby influence optical fiber attenuation and intensity, the combination mandrel surface need be used the HF acid corrosion, and etching extent requires to be not less than 0.05mm by depth of corrosion, behind the cleaning-drying, one or more snippets combination plug is inserted in the big sleeve pipe, be combined into RIC, as shown in Figure 4.Big telescopic hydroxyl spreads to sandwich layer in the drawing process in order to reduce, and big telescopic hydroxy radical content requires further to require less than 1ppm less than 10ppm.
Adopt the resulting large size prefabricated rod of the present invention can take direct wire drawing or earlier in the wire drawing again after the molten prefabricated rods that is reduced to together and is drawn into required external diameter with big sleeve pipe and combination plug on the stretching tower.
Use method provided by the invention, can prepare G.652.C/D optical fiber of ITU, less than 0.344dB/km, the attenuation at 1383nm place is less than 0.334dB/km in the attenuation at 1310nm place for prepared optical fiber, the attenuation at 1550nm place is less than 0.224dB/km, and the loss at 1383nm place is lower than the prescribed value of 1310nm.Press the hydrogen loss testing method of IEC regulation, at ambient temperature optical fiber being placed the hydrogen dividing potential drop is 0.01 atmosphere, the attenuation increase at continuous monitoring optical fiber 1240nm place.When 1240nm place attenuation increases above behind the 0.03dB/km optical fiber is taken out from this atmosphere, test the attenuation at 1383nm place after 14 days under normal operation, the attenuation increase of this optical fiber is no more than 0.01dB/km.The preparation method that the present invention proposes can adopt relatively inexpensive surrounding layer, and production low-water-peak fiber at lower cost is particularly suited for scale operation.
In addition, be not limited to method provided by the invention and prepare G.652.C/D optical fiber, any single-mode fiber can be realized in this way.
Description of drawings
Fig. 1 is that the present invention makes up the plug schematic cross-section
Fig. 2 is the synoptic diagram that plug of the present invention and small casing are formed RIT
Fig. 3 is the present invention's tower synoptic diagram that stretches
Fig. 4 is the large size prefabricated excellent wiring layout that the present invention is made up of single combination plug
Fig. 5 is the large size prefabricated excellent wiring layout that the present invention is made up of multistage combination plug
Fig. 6 is a plug refractive index profile synoptic diagram of the present invention
Fig. 7 is a chuck translational speed curve of the present invention
Fig. 8 is combination plug core diameter and external diameter distribution before and after the present invention compresses
Fig. 9 is that the present invention directly assembles the distribution plan of the water peak of gained optical fiber along prefabricated rods with the multistage plug
Figure 10 is the distribution plan of the water peak of gained optical fiber after the present invention receives together with flame passes the multistage plug along prefabricated rods
Embodiment
To provide detailed embodiment below, use range of the present invention will become apparent.But, should be understood that these are used for illustrating that the specific embodiment of the preferred embodiments of the invention only is used for illustrating, because various variations within the spirit and scope of the present invention and change are conspicuous for those skilled in the art.
Table 1 is for to combination plug seven embodiment not stretching or compress, and (1) at first uses G.652.C/D plug of PCVD prepared, the design of plug as shown in Figure 6, experiment parameter is as shown in table 1.
Table 1. prefabricated rods geometric parameter (one)
(2) then one or more snippets plug is inserted in small casing, first with fluorine-containing gas and assist gas O on the stretching tower
2, He corrodes mandrel outer surface and small casing internal surface, with its molten being reduced to together, obtains making up plug again; According to according to demand of practical production, multistage plug plug can be selected 2,4,5,6,8,10,15 or more, as long as production unit can meet the demands.
The corrosion stage process is as follows: the speed V of stove
F=50mm/min; The temperature T of stove=1800 ℃; Gas flow is: 150sccm C
2F
6+ 150sccm O
2Or 150sccm SF
6+ 200sccm He; The pump terminal pressure is-50Pa;
The molten stage process that contracts is as follows: the temperature T of stove=2120 ℃; The speed V of stove
F=15mm/min; The pump terminal pressure is-500Pa.
(3) will make up mandrel surface HF acid corrosion, etching extent requires to be not less than 0.05mm by depth of corrosion, behind the cleaning-drying, one or more snippets combination plug is inserted in the big sleeve pipe, is combined into preformod of optical fiber with low water peak in large size.
The etching extent of plug is pressed thickness gauge 0.3mm, the etching extent of combination plug is counted 0.05mm by thickness.According to needs of production the etching extent of plug is pressed thickness and can be 0.4mm or 0.5mm, the etching extent of combination plug is pressed thickness can be 0.06mm, 0.08mm or 0.1mm.
Two embodiment that table 2 pair compresses the combination plug
In above-mentioned steps (2), plug inserted to melt in the small casing when contracting it is compressed, obtain making up plug.Concrete scheme is No. 1 plug and small casing design in the employing table 1, with plug and small casing is molten be reduced to together in, it is compressed, make it become combination plug with 200mm prefabricated rods coupling.The speed of electrical heater is 14mm/min, the translational speed of corresponding chuck head as shown in Figure 7, the distribution of core diameter and combination plug external diameter is as shown in Figure 8 before and after the compression.The geometric parameter representative value that makes up plug after compression is as shown in table 2.
Table 2. prefabricated rods geometric parameter (two)
With the combination plug of 8 long 37.5mm that obtain after compression, being assembled to external diameter is 200.3mm, and internal diameter is 54.0mm (CSA=29200mm
2), long in the big sleeve pipe of 300mm, and form large size prefabricated rod (as shown in Figure 5), the large size prefabricated rod of gained can draw more than the optical fiber 7000km.Dual mode is also taked in wire drawing, and the one, direct wire drawing, the 2nd, on the stretching tower, will make up earlier and be drawn into wire drawing again after the small size prefabricated rods that external diameter is 80mm when plug is reduced to big sleeve pipe is molten.As a same reason, the combination plug can be selected 2,4,5,6,8,10,15 or more, as long as production unit can meet the demands.
In the above-described embodiments, the result is as shown in table 3 for gained optical fiber, and other parameter all meets the G.652.D requirement of sonet standard.
Table 3. optical fiber result
In addition, for the prefabricated rods of forming by the multistage plug, adopt respectively directly pile up and receive each plug together with flame passes earlier after again with plug and the molten method of making the combination plug together that is reduced to of small casing, gained optical fiber water peak is along the distribution of prefabricated rods as shown in Figures 9 and 10.The result shows, adopts the method for directly piling up, and eliminated directly connecing the influence of plug to the water peak, and the length of plug is unrestricted, shows that thus the inventive method is fit to the scale operation preformod of optical fiber with low water peak in large size.
Claims (9)
1. the manufacture method of a preformod of optical fiber with low water peak in large size, it may further comprise the steps:
(1), makes the plug of 2.0≤b/a value≤3.8,2.5≤c/a value≤6;
(2), one or more snippets plug is inserted in small casing, on the stretching tower, with fluorine-containing gas and assist gas mandrel outer surface and small casing internal surface are corroded earlier, it is melted be reduced to together then, obtain making up plug;
(3), will make up mandrel surface HF acid corrosion, etching extent is by depth of corrosion, requires to be not less than 0.05mm, behind the cleaning-drying, one or more snippets combination plug inserted in the big sleeve pipe, is combined into preformod of optical fiber with low water peak in large size; Wherein the b/a value is the ratio of sedimentary sagging cladding diameter and sandwich layer diameter in pipe, and the c/a value is the ratio of diameter of mandrel and sandwich layer diameter.
2. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: in the described step (2), plug inserted melt in the small casing when contracting, simultaneously it is compressed, obtain making up plug.
3. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: the ratio d/a value of described combination diameter of mandrel and sandwich layer diameter is 4.3≤d/a value≤8; The hydroxy radical content of the used quartz material of described small casing is less than 1000ppb.
4. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: described stretching tower is made up of pylon, the chuck that can move up and down and rotate, electrical heater moving up and down, the gas supply system pressure control system of unifying.
5. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: the etching extent of plug is pressed hydrobarometer 0.3-0.5mm, the etching extent of combination plug is counted 0.05-0.1mm by the degree of depth.
6. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: described big telescopic cross-sectional area is 9600mm
2-230000mm
2
7. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: the hydroxy radical content in the described fluorine-containing gas requires less than 1000ppb, and the hydroxy radical content in the assist gas requires less than 100ppb.
8. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1 or 7, wherein: the hydroxy radical content in the described fluorine-containing gas requires less than 10ppb, and the hydroxy radical content in the assist gas requires less than 1ppb.
9. according to the manufacture method of a kind of preformod of optical fiber with low water peak in large size of claim 1, wherein: during molten contracting, the temperature of process furnace is 1600-2200 ℃, and the process furnace translational speed is 40-60mm/min, the pipe internal pressure be-100pa extremely+100pa.
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| CN1884165B (en) * | 2006-06-30 | 2010-04-07 | 富通集团有限公司 | Method for preparing optical fiber by large-sized low-water-peak optical fiber preform and dedicated device therefor |
| CN101585658A (en) * | 2009-06-23 | 2009-11-25 | 长飞光纤光缆有限公司 | Optical fiber perform and manufacture method thereof |
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| CN107382051B (en) * | 2017-08-23 | 2020-05-08 | 成都富通光通信技术有限公司 | Optical fiber preform dehydration process and optical fiber |
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| CN109665713B (en) * | 2019-01-29 | 2021-09-03 | 江苏永鼎股份有限公司 | Low water peak large-size optical fiber preform and manufacturing method thereof |
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| CN113277725B (en) * | 2021-06-04 | 2022-09-20 | 杭州富通通信技术股份有限公司 | Processing technology of prefabricated rod |
| CN113754269B (en) * | 2021-09-01 | 2023-07-21 | 浙江富通光纤技术有限公司 | Processing technology of prefabricated rod |
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| CN1267369A (en) * | 1997-08-19 | 2000-09-20 | 皮雷利·卡维系统有限公司 | Method of and apparatus for mfg. optical fiber preform |
| EP1000908A2 (en) * | 1998-10-08 | 2000-05-17 | Heraeus Quarzglas GmbH | Method for producing quartz glass preform for optical fibers |
| JP2000178039A (en) * | 1998-10-08 | 2000-06-27 | Shinetsu Quartz Prod Co Ltd | Production of quartz glass preform for optical fiber |
| EP0994078A2 (en) * | 1998-10-16 | 2000-04-19 | Heraeus Quarzglas GmbH & Co. KG | Method for producing quartz glass preform for optical fibers |
| US6460378B1 (en) * | 2000-02-29 | 2002-10-08 | Xiaoyuan Dong | Collapsing a multitube assembly and subsequent optical fiber drawing in the same furnace |
| CN1337367A (en) * | 2001-09-08 | 2002-02-27 | 长飞光纤光缆有限公司 | Manufacture of prefabricated fiber rod |
| CN1396131A (en) * | 2002-07-09 | 2003-02-12 | 长飞光纤光缆有限公司 | Process for preparing quartz optical fibre core |
| CN1398804A (en) * | 2002-08-28 | 2003-02-26 | 长飞光纤光缆有限公司 | Prefabricated fiber rod with several clad layers and its fabrication |
| CN1472151A (en) * | 2003-06-27 | 2004-02-04 | 长飞光纤光缆有限公司 | Manufacture of single mode oplical fibers |
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| CN1760150A (en) | 2006-04-19 |
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