GB2067181A - Producing optical fibre preforms - Google Patents
Producing optical fibre preforms Download PDFInfo
- Publication number
- GB2067181A GB2067181A GB8041394A GB8041394A GB2067181A GB 2067181 A GB2067181 A GB 2067181A GB 8041394 A GB8041394 A GB 8041394A GB 8041394 A GB8041394 A GB 8041394A GB 2067181 A GB2067181 A GB 2067181A
- Authority
- GB
- United Kingdom
- Prior art keywords
- substrate
- solution
- axis
- substance
- installation
- 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.)
- Granted
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
- C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
- C03B37/01285—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by centrifuging
-
- 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
- C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
-
- 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
- C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
- C03B37/01291—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process
- C03B37/01294—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process by delivering pulverulent glass to the deposition target or preform where the powder is progressively melted, e.g. accretion
-
- 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
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/10—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/32—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with aluminium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/40—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/40—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
- C03B2201/42—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn doped with titanium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth 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)
- Glass Compositions (AREA)
Abstract
Doped silica solution is sprayed from nozzle 14 onto the inside of axially rotating silica tube 1 (itself optionally doped) which is heated by tubular furnace 23, part 23b of which causes solvent evaporation at 200-800 DEG C and part 23a of which causes subsequent densification of the film at 500-2000 DEG C. Nozzle 14 and furnace 23 are conjointly reciprocated axially of tube 1 by movement (f2) of carriage 17. The refractive index of successively deposited layers is varied stepwise or gradually by adjusting the amount of dopants (P2O5, B2O3, compounds of Ge, Ti, Al, As, Nb, Sb) in the solution. <IMAGE>
Description
SPECIFICATION
Method and installation for the production of preforms for optical fibres
The present invention concerns a method for the production of a preform with a view to obtain an optical fibre with index jump or gradient by forming layers of doped transparent substance on the surface of an elongated substrate made of the said substance in the pure or doped state, of the type wherein a solution of the said substance and at least one doping agent in a solvent is spread on the substrate, which substrate is simultaneously driven in rotation about its axis at high speed in order to distribute the said solution evenly over the surface of said substrate, the said substrate being heated to cause the evaporation of the solvent, leaving on the substrate a layer which is densified by heat treatment, this operation being repeated as many times as is necessary to obtain the required number of layers.
The object of the present invention is to propose a method of the aforesaid type, which can be carried out in an installation of simple design and permits to obtain layers with uniform optical properties, and showing no defects - or inhomogeneities -- which could reduce the performances of the optical fibres obtained from the preforms.
This object is reached according to the invention due to the fact that the solution is spread in sequential manner on successive parts of the substrate and that each of the said parts starts to be heated at the moment when the solution is spread on it.
Advantageously, the solution is deposited on to the substrate by spraying.
Advantageously, a substrate made of silica is used.
Advantageously, several solutions are sprayed simultaneously, the rates of spray of which are controlled separately to obtain the desired concentrations of doping agents.
Advantageously, the substrate is first heated at temperatures varying between 2000 and 8000C to evaporate the solvent, and then at temperatures varying between 5000C and 20000C to densify the layer.
This method is advantageously used in an installation which, according to the invention, is characterized in that it comprises means for supporting a substrate of elongated shape and for driving it in rotation about its axis, means for spraying a solution containing the substance constituting the substrate and a doping agent over the substrate, and means for heating the said substrate, and in that the said spraying and heating means are movable in the same distance with respect to the substrate and in the direction of the axis thereof.
Advantageously, the heating means comprise two parts axially offset according to the axis of the substrate, the said parts supplying different flux of heat.
Advantageously, the support means are arranged so as to maintain the axis of the substrate horizontal.
The invention will be more readily understood on reading the following description with reference to the accompanying drawings: - Figure 1 is a partial elevational and crosssectional diagram of an installation according to one embodiment of the invention; and - Figure 2 is a diagram of a device for supplying the spraying liquid to be used in the installation of Figure 2, according to one embodiment of the invention.
The illustrated invention comprises: (a) means for supporting a silica tube 1 so that its axis is horizontal and for rotating the said tube at high speed, about its axis 1 a, (b) means for spraying on the inner surface 1 b of said tube 1 a liquid containing silica SiO2, in solution in a solvent, and in some cases, added with another so-called doping substance, which can be boron oxide B2O3, phosphorous oxide P205 and more generally a compound of germanium, titanium, aluminium, arsenic, niobium, antimony, etc., and (c) means for heating the wall of tube 1 as soon as a certain quantity of the said liquid has been sprayed on to the inner surface I b of the said wall.
In the example shown in Figure 1, the support and rotation means comprise two mutually coaxial mandrels 2 and 3 each one provided with a rotary support 2a, 3a mounted for rotation about its axis on a bearing 4, 5 of a framework 6, 7; each support 2a, 3a is provided, on its side face 2b, 3b oriented towards the other support 3a, 2a, with a plurality of dovetail guides - or grooves -8,9 radially arranged, and on each one of which is slidably mounted a jaw 10 provided, on its end adjacent the rotation axes of the mandrels 2, 3, with a resilient endpiece 1 Oa.
The mandrel 2 is axially fixed and can be driven in rotation by a motor 11 via a transmission means comprising a pulley 12 keyed on to the output shaft 1 1 a of the motor 11, and a belt 13 passing over the pulley 12 and over the support 2a acting as a pulley.
The mandrel 3 is mounted on a frame of the installation, the position of which frame is axially adjustable; this is symbolized in Figure 1 by the double arrow f, situated close to the frame 7 which carries the bearing 5 supporting the mandrel 3.
The spraying means consist of a nozzle 14 mounted at the free end of a rigid support rod 1 5 acting as a conduit for supplying the spraying liquid to the nozzle 14; the rod 1 5 is supported by an element 16 mounted on another rod 1 6a, the assembly 16, 1 6a being mounted on a carriage 17 movable in horizontal translation (double arrow f2) on a slide 1 8 of the installation frame. Said carriage 1 7 can be driven in translation by a motor 19, via a worm 20 which is screwed into a tapping 21 of the carriage 17, which can be coupled to the output shaft 1 9a of the motor 19, via a regulator 22.
The means for heating the pipe 1 consists in a tubular furnace 23 which is meant to be traversed by the tube to be heated 1. Said furnace 23 is supported by a column 24 which is itself mounted on the carriage 17. Said furnace 23 comprises a first section 23a situated on the right in Figure 1, and a second section 23b situated on the left in said figure. The section 23a supplies a thermal flux which is superior to that supplied by the other part 23b.
The nozzle 14 is situated, with respect to the furnace 23, so that only the sprays 1 4a of liquid sent from the said nozzle 14 are surrounded by the furnace 23. In this way, the liquid which has not been sprayed and which is still in the rod 1 5 or in the nozzle 14, is virtually not heated.
The spraying means 14, 15 are supplied with spraying liquid by means of a flexible tube 25, from a device which is diagrammatically shown in
Figure 2.
As can be seen on that Figure, the said device comprises a reservoir 26 of SiO2 solution, a reservoir 27 of SiO2 + P205 solution, and a reservoir 28 of SiO2 + B203 solution. Each reservoir 26 to 28 is connected to a mixing chamber 29 via respective pipes 30, 31, 32, on which is interposed a flow-controlling and suction drive - or flowing -- device 33, 34, 35.
The mixing chamber 29 is connected to the flexible tube 25 via a suction drive - or flowing device 36. In the illustrated example, the driving devices 33 to 36 are of the Venturi effect type: each one of them comprises a nozzle 37 supplied with fluid through its end or inlet 37a, the said nozzle issuing into the neck of a ventury tuyere supplied, through its wide section end 38a, with a driving gas coming from a compressed gas storage tank 39; a servo-valve 40 to 43 permits to control independently the pressure of the driving gas supplied to each driving device 33 to 36. The valves 40 to 43 are so-called constant pressure outlet valves, i.e. valves which maintain a constant pressure at their downstream end.An adjustable constriction 44 to 46 makes it possible to control independently the flow of liquid supplied by each one of the liquid reservoirs 26 to 28.
The installation described in the foregoing operates as follows:
The silica tube 1 (see Figure 1) is placed between the mandrels 2, 3, where each end of said tube is clamped in position between the jaws 10, said latter being secured on the supports 2a, 3a by tightening the locking screws 47. In that position, the tube 1 is co-axial to the rotary supports 2a, 3a.
The rod 15 provided with the nozzle 14 is inserted into the tube 1 through an axial opening 48 in the mandrel 3. The furnace 23 being placed near the mandrel 2 and being traversed co-axially by the pipe 1, the position of the nozzle 14 is adjusted, as shown in Figure 1, so that the free end 1 4a of the nozzle 14 comes flush with the plane of the end face 23c, on the side of section 23b, of the furnace 23. Said relative position of the nozzle 14 with respect to the furnace 23 is secured by tightening a set screw 49 provided on the support 16.
Several successive layers, each one having a different index of refraction, are then deposited on the inner face 1 b of tube 1, in the following manner:
First of all, for each layer to be deposited, the doping agent content in the sprayed solution is set by suitably adjusting the members 40 to 42 and 43 to 45; secondly, an output valve 50 situated between the device 36 and the flexible tube 25 is closed before the rod 15 provided with the nozzle 14 is inserted in the tube 1.
When the elements 14, 1 5 are in position inside the tube 1, said tube is driven in rotation about its axis 1 a by the motor 11. The valve 50 is then open whilst the motor 1 9 is started off. The carriage 17 will then be moving slowly towards the left, driving with it the nozzle 14 and the furnace 23. The nozzle 14 is such that the spray of liquid 1 4b strikes the wall 1 b in the region surrounded by the part 23b of the furnace 23. The nozzle 14 is arranged so that said spray 14b is annular-shaped, that is to say that no liquid is sprayed by said nozzle 14 in directions axial or adjacent to the axis 1 a of the tube 1.
The liquid film thus deposited is immediately dried, then densified and vitrified by the furnace 23 in the following way:
The first section 23b of the furnace ensures the
evaporation of the solvent by bringing the part of the pipe wall which it surrounds to a temperature going typically from 2000C to 8000C.
The second section (23a) of the furnace brings the portion of pipe wall which it surrounds to a temperature going typically from 5000C to 20000C, to allow the densification or the vitrification of the deposited film.
It will be noted that the inside volume of the pipe 1 is isolated from the outside atmosphere, this preventing any dust or other impurities from getting into the film. The volatile gases resulting from the baking of the deposited films can be discharged through a conduit 51 on which is fitted a fan 52.
It is possible, by adjusting the spraying pressure with the valve 50 and the rates of flow with the flow-meters 33 to 35, to control the contents of the different oxides, the pure SiOz solution being used to modify the concentrations of the two doping agents, phosphorus and boron.
The spraying system will sweep over the whole length of the tube 1 , said pipe rotating about its axis; the speeds will be selected so that the spraying is perfectly even. The heating element 23 follows the sweeping action of the spray and its mission is to evaporate the solvents of the solution and to crystallize the layers of pure silica and metal oxide directly these are deposited.
The present method is used for producing preforms made preferably in silica, and in which one only or two doping agents are incorporated, such as boron to lower the index, or germanium to raise it, the said doping agents being given by way of example.
Claims (9)
1. A method for the production of a preform with a view to obtain an optical fibre with index jump or gradient by forming layers of doped transparent substance on the surface of an elongated substrate constituted of the said substance in the pure or doped state, which method consists in spreading a solution of the said substance and of at least one doping agent in a solvent over the said substrate, the latter being simultaneously driven in rotation about its axis at high speed in order to spread the said solution evenly on the surface of the said substrate, which substrate is heated in order to evaporate the solvent and leave only a layer on the substrate said layer being thereafter densified by heat treatment, and the operation being repeated as many times as is necessary to obtain the required number of layers, method wherein the solution is spread sequentially over the successive parts of the substrate and wherein the heating of each of the said parts is started when the solution is being spread over the said part.
2. A method as claimed in claim 1, wherein a silica substrate is used.
3. A method as claimed in claim 1, wherein the solution is sprayed on to the substrate.
4. A method as claimed in claim 1, wherein several solutions are sprayed simultaneously, their rate of flow being separately adjusted to obtain
the desired concentrations of doping agent.
5. A method as claimed in claim 1, wherein the substrate is first heated up to temperatures varying between 2000C and 8000C in order to evaporate the solvent, and then to temperatures varying between 5000C and 20000C in order to densify the layer.
6. An installation for carrying out the method such as claimed in claim 1, comprising means for supporting an elongated shaped substrate and for driving it in rotation about its axis, means for spraying on the substrate a solution containing the substance constituting the substrate and a doping agent, and means for heating the said substrate, wherein the spraying means and the heating means are moved over the same distances with respect to the substrate and in the direction of the axis thereof.
7. An installation as claimed in claim 6, wherein the heating means comprise two parts axially offset according to the axis of the substrate the said parts supplying different flux of heat.
8. An installation as claimed in any one of claims 6 and 7, wherein the supporting means are arranged so as to hold the axis of the substrate in the horizontal position.
9. A preform obtained with the method such as claimed in claim 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8000412A FR2473497B2 (en) | 1980-01-09 | 1980-01-09 | PROCESS AND PLANT FOR MANUFACTURING A PREFORM FOR OPTICAL FIBERS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2067181A true GB2067181A (en) | 1981-07-22 |
| GB2067181B GB2067181B (en) | 1984-01-04 |
Family
ID=9237383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8041394A Expired GB2067181B (en) | 1980-01-09 | 1980-12-29 | Producing optical fibre preforms |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS56100149A (en) |
| DE (1) | DE3011904A1 (en) |
| FR (1) | FR2473497B2 (en) |
| GB (1) | GB2067181B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0153785A2 (en) * | 1984-02-21 | 1985-09-04 | Philips Patentverwaltung GmbH | Process for producing tubular bodies and device for carrying out the process |
| FR2571358A1 (en) * | 1984-10-05 | 1986-04-11 | Suwa Seikosha Kk | PROCESS FOR THE PREPARATION OF OPTICAL FIBER PREFORMS |
| EP0196717A1 (en) * | 1985-03-29 | 1986-10-08 | Philips Patentverwaltung GmbH | Method and apparatus for making glass bodies |
| US4770682A (en) * | 1983-06-15 | 1988-09-13 | U.S. Philips Corp. | Device for manufacturing optical fiber preforms |
| US4952225A (en) * | 1987-10-16 | 1990-08-28 | Societe Anonyme Dite: Compagnie Generale D'electricite | Method of making an internally-doped tube of transparent glass, in particular for manufacturing rare-earth-doped optical fibers |
| EP1016636A1 (en) * | 1998-12-28 | 2000-07-05 | Hoya Corporation | Method for manufacturing optical fiber preform and method for manufacturing optical fiber |
| US6460379B2 (en) * | 1999-10-25 | 2002-10-08 | Fitel Usa Corp. | MCVD apparatus having two opposing motors to eliminate backlash in burner motion |
| WO2008094228A1 (en) | 2007-01-29 | 2008-08-07 | Brown David P | Method and apparatus for continuous or batch optical fiber preform and optical fiber production |
| US11345606B2 (en) | 2017-02-17 | 2022-05-31 | David Brown | Deposition particles and a method and apparatus for producing the same |
| CN117602816A (en) * | 2024-01-23 | 2024-02-27 | 创昇光电科技(苏州)有限公司 | MCVD on-line doped prefabricated rod and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3206181A1 (en) * | 1982-02-20 | 1983-09-01 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Process for the production of a preform from which optical fibres can be drawn |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2447353B2 (en) * | 1974-10-04 | 1977-06-02 | Jenaer Glaswerk Schott & Gen., 6500 Mainz | METHOD OF MANUFACTURING FIBER OPTICS |
| DE2545273A1 (en) * | 1975-10-09 | 1977-04-14 | Licentia Gmbh | Coated optical fibre preform prodn. - by depositing coating from soln. and moderate heating, is fast, simple and cheap |
| DE2637937A1 (en) * | 1976-08-23 | 1978-03-02 | Siemens Ag | MANUFACTURING OF FIBERS BY A LIQUID-PHASE DEPOSITION PROCESS |
-
1980
- 1980-01-09 FR FR8000412A patent/FR2473497B2/en not_active Expired
- 1980-03-12 JP JP3045980A patent/JPS56100149A/en active Pending
- 1980-03-27 DE DE19803011904 patent/DE3011904A1/en not_active Withdrawn
- 1980-12-29 GB GB8041394A patent/GB2067181B/en not_active Expired
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4770682A (en) * | 1983-06-15 | 1988-09-13 | U.S. Philips Corp. | Device for manufacturing optical fiber preforms |
| US4966614A (en) * | 1983-06-15 | 1990-10-30 | U.S. Philips Corp. | Method of and device for manufacturing optical fibers |
| EP0153785A3 (en) * | 1984-02-21 | 1987-05-27 | Philips Patentverwaltung Gmbh | Process for producing tubular bodies and device for carrying out the process |
| EP0153785A2 (en) * | 1984-02-21 | 1985-09-04 | Philips Patentverwaltung GmbH | Process for producing tubular bodies and device for carrying out the process |
| FR2571358A1 (en) * | 1984-10-05 | 1986-04-11 | Suwa Seikosha Kk | PROCESS FOR THE PREPARATION OF OPTICAL FIBER PREFORMS |
| EP0196717A1 (en) * | 1985-03-29 | 1986-10-08 | Philips Patentverwaltung GmbH | Method and apparatus for making glass bodies |
| US4952225A (en) * | 1987-10-16 | 1990-08-28 | Societe Anonyme Dite: Compagnie Generale D'electricite | Method of making an internally-doped tube of transparent glass, in particular for manufacturing rare-earth-doped optical fibers |
| EP1016636A1 (en) * | 1998-12-28 | 2000-07-05 | Hoya Corporation | Method for manufacturing optical fiber preform and method for manufacturing optical fiber |
| US6460379B2 (en) * | 1999-10-25 | 2002-10-08 | Fitel Usa Corp. | MCVD apparatus having two opposing motors to eliminate backlash in burner motion |
| WO2008094228A1 (en) | 2007-01-29 | 2008-08-07 | Brown David P | Method and apparatus for continuous or batch optical fiber preform and optical fiber production |
| EP2158169A1 (en) * | 2007-01-29 | 2010-03-03 | David P. Brown | Method and apparatus for continuous or batch optical fiber preform and optical fiber production |
| EP2158169A4 (en) * | 2007-01-29 | 2013-08-28 | David P Brown | Method and apparatus for continuous or batch optical fiber preform and optical fiber production |
| US11345606B2 (en) | 2017-02-17 | 2022-05-31 | David Brown | Deposition particles and a method and apparatus for producing the same |
| CN117602816A (en) * | 2024-01-23 | 2024-02-27 | 创昇光电科技(苏州)有限公司 | MCVD on-line doped prefabricated rod and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2473497A2 (en) | 1981-07-17 |
| JPS56100149A (en) | 1981-08-11 |
| GB2067181B (en) | 1984-01-04 |
| FR2473497B2 (en) | 1985-07-05 |
| DE3011904A1 (en) | 1981-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931229 |