CN110746107B - Method for manufacturing preform loose body - Google Patents
Method for manufacturing preform loose body Download PDFInfo
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- CN110746107B CN110746107B CN201911191172.0A CN201911191172A CN110746107B CN 110746107 B CN110746107 B CN 110746107B CN 201911191172 A CN201911191172 A CN 201911191172A CN 110746107 B CN110746107 B CN 110746107B
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- Prior art keywords
- loose body
- loose
- gas
- preform
- spraying
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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]
- C03B37/01413—Reactant delivery systems
- C03B37/0142—Reactant deposition burners
-
- 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]
-
- 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
Abstract
The application discloses a method for manufacturing a preform loose body, which comprises the following steps: 1) respectively clamping two ends of the core rod on two chucks; 2) the blowtorch under the core rod moves in a reciprocating way to obtain loose objects; 3) when the outer diameter of the loose body exceeds a preset critical value, symmetrically spraying gas to the loose body on two sides of the lower part of the loose body, wherein the spraying direction of the gas is aligned to the axis of the mandrel, and the closer to the middle part of the loose body, the higher the spraying speed of the gas is; 4) stopping the blast burner after the outer diameter of the loose body reaches a set value; 5) after cooling the loose mass, the gas injection into the loose mass was stopped. According to the manufacturing method, the gas is symmetrically sprayed to the loose bodies on the two sides of the lower portion of the loose bodies, and the spraying directions of the gas are aligned to the axis of the mandrel, so that the two sides can generate upward inclined force to the loose bodies, the final resultant force is basically vertical and upward due to the symmetrical arrangement, the whole stress effect of the loose bodies is good, and the bending and hanging phenomenon cannot occur in the middle of the loose bodies.
Description
Technical Field
The invention relates to the field of optical fiber preforms, in particular to a method for manufacturing a preform loose body.
Background
In the OVD method, a burner mixes silicon tetrachloride or octamethylcyclotetrasiloxane evaporating gas and oxygen, and sprays the mixture, hydrogen (or methane gas) and oxygen flame together to a rotating core rod, the raw materials are subjected to hydrolysis reaction under the action of heat energy to generate silicon dioxide, dust particles generated by pyrolysis of silicon dioxide particles are adsorbed on the rotating core rod passing through the flame layer by layer to obtain loose bodies, and then the loose bodies are vitrified to obtain a preform rod.
As shown in fig. 1, when the loose body is manufactured by the existing OVD method, the core rod is stressed most in the middle area of the loose body and is easy to bend and hang, which finally affects the quality of the preform rod.
Disclosure of Invention
The invention aims at the problems and provides a method for manufacturing a preform loose body.
The technical scheme adopted by the invention is as follows:
a method of making a preform loose mass comprising the steps of:
1) respectively clamping two ends of the core rod on two chucks, and driving the core rod to rotate by the chucks;
2) the blowtorch under the core rod moves in a reciprocating way, so that the particles are deposited on the outer surface of the core rod, and loose bodies are obtained;
3) when the outer diameter of the loose body exceeds a preset critical value, symmetrically spraying gas to the loose body on two sides of the lower part of the loose body, wherein the spraying direction of the gas is aligned to the axis of the mandrel, and the closer to the middle part of the loose body, the higher the spraying speed of the gas is;
4) stopping the blast burner after the outer diameter of the loose body reaches a set value;
5) after cooling the loose mass, the gas injection into the loose mass was stopped.
According to the manufacturing method, when the outer diameter of the loose body is small, the loose body is manufactured according to a normal process, when the outer diameter of the loose body exceeds a preset critical value, the phenomenon of suspension is easy to occur, gas is symmetrically sprayed to the loose body on two sides of the lower portion of the loose body, the spraying direction of the gas is aligned to the axis of the mandrel, so that the two sides can generate upward inclined force to the loose body, and the final resultant force is basically vertical upward due to the symmetrical arrangement; the closer to the middle of the loose body, the higher the gas injection speed, namely the closer to the middle of the loose body, the higher the upward resultant force of the loose body is, and the mode can ensure that the whole stress effect of the loose body is good and the bending and suspension phenomenon cannot occur in the middle of the loose body. After the loose body is cooled, the binding force between the particles is strengthened, and at the moment, after the gas injection to the loose body is stopped, the loose body and the core rod are not easy to generate the phenomenon of suspension.
Optionally, steps 1) to 5) are performed by a deposition apparatus comprising:
a machine tool;
the two chucks are oppositely arranged, arranged in the machine tool and capable of synchronously rotating, and used for respectively clamping two ends of the core rod;
the fixing frame is arranged below the two chucks;
the blowtorch is movably arranged on the fixed frame and can reciprocate along the length direction of the fixed frame;
the outer diameter measuring equipment is arranged in the machine tool and used for measuring the outer diameter of the loose body;
two spout the seat, fix in the lathe, two spout the seat and set up about A plane symmetry, the A plane is vertical plane, and the axis of chuck is located the A plane, spout the jet-propelled group that the seat was provided with a plurality of upper and lower intervals and set up, and every jet-propelled group all includes the bar mouth that a plurality of levels and interval set up, the length direction of bar mouth is parallel with the length direction of plug, and the axis of chuck is aimed at to the injection direction of bar mouth, spout the seat and be used for providing ascending holding power to the lower part injection gas of loose body for the loose body.
The chuck structure of this application is current conventional structure, can be for triangle chuck during the in-service use, and the chuck can drive the rotation through motor and gear train. The blowtorch and the fixed frame are located in the conventional structure, and when the blowtorch and the fixed frame are actually used, the blowtorch can reciprocate on the fixed frame through the ball screw pair, the gear rack, the conveying belt and other structures.
Optionally, still have the air feed channel in the spout seat, bar mouth and air feed channel intercommunication, the fan is installed to bar mouth play.
The air outlet speed, namely the force of the air on the loose body can be adjusted by controlling the power of the fan.
Optionally, the machine tool top has an exhaust port, and the deposition apparatus further comprises:
the particulate matter filtering device is fixed on the outer side of the machine tool;
the hollow heating box is fixed on the outer side of the machine tool, an inlet of the heating box is communicated with an outlet of the particulate matter filtering device, and an outlet of the heating box is communicated with the air supply channel of the spray seat;
and the collecting cover is fixed on the top of the machine tool and covers the exhaust port, and is provided with two outlets, wherein one outlet is used for being communicated with an external tail gas treatment system, and the other outlet is communicated with an inlet of the particulate matter filtering device.
Optionally, the heating box has a heating wire therein.
Optionally, the outlet of the heating box is provided with a temperature sensor for measuring the temperature of the gas exiting from the heating box.
In practical application, after deposition of the loose bodies is completed and the blowtorch is turned off, the temperature of the outlet is gradually reduced, the gas is sprayed out through the spray seat, the loose bodies are gradually cooled, and compared with conventional normal-temperature cooling, the cooling speed of the loose bodies can be greatly increased.
Optionally, a controller for controlling the operation of the deposition apparatus is also included.
Optionally, one side of the spray nozzle surface facing the chuck axis is an arc surface.
Optionally, the spray seat is fixed in the frame through a support frame.
Optionally, each jet stack has at least 3 jets, and the jet stack has an odd number of jets.
The arrangement makes the sprayed gas more uniformly distributed, and the middle gas nozzle can be opposite to the middle of the loose body.
The invention has the beneficial effects that: according to the manufacturing method, when the outer diameter of the loose body is small, the loose body is manufactured according to a normal process, when the outer diameter of the loose body exceeds a preset critical value, the phenomenon of suspension is easy to occur, gas is symmetrically sprayed to the loose body on two sides of the lower portion of the loose body, the spraying direction of the gas is aligned to the axis of the mandrel, so that the two sides can generate upward inclined force to the loose body, and the final resultant force is basically vertical upward due to the symmetrical arrangement; the closer to the middle of the loose body, the higher the gas injection speed, namely the closer to the middle of the loose body, the higher the upward resultant force of the loose body is, and the mode can ensure that the whole stress effect of the loose body is good and the bending and suspension phenomenon cannot occur in the middle of the loose body. After the loose body is cooled, the binding force between the particles is strengthened, and at the moment, after the gas injection to the loose body is stopped, the loose body and the core rod are not easy to generate the phenomenon of suspension.
Description of the drawings:
FIG. 1 is a schematic view showing the occurrence of sagging in the loose preform processing of the prior art;
FIG. 2 is a schematic view of a deposition apparatus of the present invention;
FIG. 3 is a schematic view of a torch, a fixed seat, and a loose body of the torch;
fig. 4 is a schematic view of the spray base.
The figures are numbered:
1. a core rod; 2. a loose mass; 3. a machine tool; 4. a chuck; 5. a blowtorch; 6. a fixed mount; 7. an outer diameter measuring device; 8. spraying seats; 9. an exhaust port; 10. a collection hood; 11. a particulate matter filtering device; 12. a heating box; 13. heating wires; 14. a temperature sensor; 15. a gas supply channel; 16. a strip-shaped opening; 17. a fan; 18. a gas injection group; 19. a support frame.
The specific implementation mode is as follows:
the present invention will be described in detail below with reference to the accompanying drawings.
A method of making a preform loose mass comprising the steps of:
1) respectively clamping two ends of the core rod on two chucks, and driving the core rod to rotate by the chucks;
2) the blowtorch under the core rod moves in a reciprocating way, so that the particles are deposited on the outer surface of the core rod, and loose bodies are obtained;
3) when the outer diameter of the loose body exceeds a preset critical value, symmetrically spraying gas to the loose body on two sides of the lower part of the loose body, wherein the spraying direction of the gas is aligned to the axis of the mandrel, and the closer to the middle part of the loose body, the higher the spraying speed of the gas is;
4) stopping the blast burner after the outer diameter of the loose body reaches a set value;
5) after cooling the loose mass, the gas injection into the loose mass was stopped.
According to the manufacturing method, when the outer diameter of the loose body is small, the loose body is manufactured according to a normal process, when the outer diameter of the loose body exceeds a preset critical value, the phenomenon of suspension is easy to occur, gas is symmetrically sprayed to the loose body on two sides of the lower portion of the loose body, the spraying direction of the gas is aligned to the axis of the mandrel, so that the two sides can generate upward inclined force to the loose body, and the final resultant force is basically vertical upward due to the symmetrical arrangement; the closer to the middle of the loose body, the higher the gas injection speed, namely the closer to the middle of the loose body, the higher the upward resultant force of the loose body is, and the mode can ensure that the whole stress effect of the loose body is good and the bending and suspension phenomenon cannot occur in the middle of the loose body. After the loose body is cooled, the binding force between the particles is strengthened, and at the moment, after the gas injection to the loose body is stopped, the loose body and the core rod are not easy to generate the phenomenon of suspension.
In the present embodiment, steps 1) to 5) are performed by a deposition apparatus, as shown in fig. 2, 3 and 4, which includes:
a machine tool 3;
the two chucks 4 are oppositely arranged, arranged in the machine tool 3 and can synchronously rotate, and the two chucks 4 are used for respectively clamping two ends of the core rod 1;
the fixing frame 6 is arranged below the two chucks 4;
the blowtorch 5 is movably arranged on the fixed frame 6 and can reciprocate along the length direction of the fixed frame 6;
an outer diameter measuring device 7 provided in the machine tool 3 for measuring the outer diameter of the loose body 2;
two spout seats 8, fix in lathe 3, two spout seats 8 and set up about A plane symmetry, the A plane is vertical plane, the axis of chuck 4 is located the A plane, spout seat 8 and be provided with the jet-propelled group 18 of a plurality of upper and lower intervals settings, every jet-propelled group 18 all includes the bar mouth 16 of a plurality of levels and interval settings, the length direction of bar mouth 16 is parallel with the length direction of plug, the axis of chuck 4 is aimed at to the injection direction of bar mouth 16, spout seat 8 and be used for the lower part jet gas to the loose body, provide ascending holding power for the loose body.
The chuck 4 structure of this application is current conventional structure, can be for triangle chuck 4 during the in-service use, and chuck 4 can drive the rotation through motor and gear train. The blowtorch 5 and the fixing frame 6 are located in the conventional structure, and when the blowtorch 5 and the fixing frame are actually used, the blowtorch 5 can reciprocate on the fixing frame 6 through a ball screw pair, a gear rack, a conveying belt and other structures.
As shown in fig. 3, in the present embodiment, the nozzle base 8 further has an air supply channel 15 therein, the strip-shaped opening 16 is communicated with the air supply channel 15, and the strip-shaped opening 16 is provided with a fan 17. The gas exit velocity, i.e. the force of the gas on the loose bodies, can be adjusted by controlling the power of the fan 17.
As shown in fig. 2, in the present embodiment, the machine tool 3 has an exhaust port 9 on the top, and the deposition apparatus further includes:
the particulate matter filtering device 11 is fixed on the outer side of the machine tool 3;
the hollow heating box 12 is fixed on the outer side of the machine tool 3, an inlet of the heating box 12 is communicated with an outlet of the particulate matter filtering device 11, and an outlet of the heating box 12 is communicated with an air supply channel 15 of the spray seat 8;
and the collecting cover 10 is fixed on the top of the machine tool 3 and covers the exhaust port 9, and the collecting cover 10 is provided with two outlets, wherein one outlet is used for being communicated with an external exhaust gas treatment system, and the other outlet is communicated with an inlet of the particulate matter filtering device 11.
As shown in fig. 2, in the present embodiment, a heating wire 13 is provided in the heating box 12; the outlet of the heating chamber 12 has a temperature sensor 14 for measuring the temperature of the gas exiting the heating chamber 12.
In practical use, after deposition of the loose objects is completed and the blowtorch 5 is turned off, the temperature at the outlet is gradually reduced, the gas is sprayed out through the spray seat 8, the loose objects are gradually cooled, and compared with the conventional normal-temperature cooling, the cooling speed of the loose objects can be greatly increased.
In this embodiment, a controller (not shown) for controlling the operation of the deposition apparatus is further included.
In this embodiment, the side of the nozzle base 8 facing the axis of the chuck 4 is an arc-shaped surface.
As shown in fig. 2 and 3, in the present embodiment, the nozzle base 8 is fixed in the frame by a support frame 19.
In practice, each jet bank 18 has at least 3 jet ports, and the jet bank 18 has an odd number of jet ports. The arrangement makes the sprayed gas more uniformly distributed, and the middle gas nozzle can be opposite to the middle of the loose body.
One specific operation flow of the deposition apparatus of this embodiment is as follows:
1) respectively clamping two ends of a core rod 1 on two chucks 4, and driving the core rod to rotate by the chucks 4;
2) the blowtorch 5 moves back and forth to deposit the particles on the outer surface of the core rod to obtain the loose body 2;
3) when the outer diameter of the loose body 2 measured by the outer diameter measuring device 7 exceeds a preset critical value, the heating wire 13 works, the fan 17 works, the two spraying seats 8 respectively spray hot gas to the two sides of the lower part of the loose body, the air speed of the strip-shaped hole in the middle of each spraying seat 8 is the largest, and the spraying speed of the strip-shaped hole in each air spraying group 18 is gradually reduced from the middle to the two sides;
4) after the outer diameter of the loose body 2 reaches a set value, the blast burner 5 stops working;
5) and the spraying seat 8 continues to spray gas to the loose body, the function of the heating wire 13 is gradually reduced until the work is stopped, the temperature of the gas sprayed by the spraying seat 8 is gradually reduced, the loose body 2 is gradually cooled, and the gas spraying to the loose body 2 is stopped after the loose body 2 is cooled.
In practical use, a sensor for detecting the temperature of the loose body can be arranged in the machine tool 3, so that the temperature of the sprayed gas can be conveniently controlled, and gradual cooling can be realized.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields and are included in the scope of the present invention.
Claims (9)
1. A method of making a preform dispersion comprising the steps of:
1) respectively clamping two ends of the core rod on two chucks, and driving the core rod to rotate by the chucks;
2) the blowtorch under the core rod moves in a reciprocating way, so that the particles are deposited on the outer surface of the core rod, and loose bodies are obtained;
3) when the outer diameter of the loose body exceeds a preset critical value, symmetrically spraying gas to the loose body on two sides of the lower part of the loose body, wherein the spraying direction of the gas is aligned to the axis of the mandrel, and the closer to the middle part of the loose body, the higher the spraying speed of the gas is;
4) stopping the blast burner after the outer diameter of the loose body reaches a set value;
5) after cooling the loose body, stopping spraying the gas to the loose body;
steps 1) to 5) are carried out by a deposition apparatus comprising:
a machine tool;
the two chucks are oppositely arranged, arranged in the machine tool and capable of synchronously rotating, and used for respectively clamping two ends of the core rod;
the fixing frame is arranged below the two chucks;
the blowtorch is movably arranged on the fixed frame and can reciprocate along the length direction of the fixed frame;
the outer diameter measuring equipment is arranged in the machine tool and used for measuring the outer diameter of the loose body;
two spout the seat, fix in the lathe, two spout the seat and set up about A plane symmetry, the A plane is vertical plane, and the axis of chuck is located the A plane, spout the jet-propelled group that the seat was provided with a plurality of upper and lower intervals and set up, and every jet-propelled group all includes the bar mouth that a plurality of levels and interval set up, the length direction of bar mouth is parallel with the length direction of plug, and the axis of chuck is aimed at to the injection direction of bar mouth, spout the seat and be used for providing ascending holding power to the lower part injection gas of loose body for the loose body.
2. The method of making a preform loose body of claim 1, wherein the nozzle holder further has a gas supply channel therein, the strip port is communicated with the gas supply channel, and a fan is installed at an outlet of the strip port.
3. The method of manufacturing a preform loose body according to claim 2, wherein the machine top has an exhaust port, and the deposition apparatus further comprises:
the particulate matter filtering device is fixed on the outer side of the machine tool;
the hollow heating box is fixed on the outer side of the machine tool, an inlet of the heating box is communicated with an outlet of the particulate matter filtering device, and an outlet of the heating box is communicated with the air supply channel of the spray seat;
and the collecting cover is fixed on the top of the machine tool and covers the exhaust port, and is provided with two outlets, wherein one outlet is used for being communicated with an external tail gas treatment system, and the other outlet is communicated with an inlet of the particulate matter filtering device.
4. A method of making a preform loose body according to claim 3, characterized in that the heating chamber has heating wires therein.
5. A method for making a preform loose body according to claim 4, characterized in that the outlet of the heating chamber is provided with a temperature sensor for measuring the temperature of the gas exiting the heating chamber.
6. A method of manufacturing a preform loose body according to claim 5, further comprising a controller for controlling the operation of the deposition apparatus.
7. A method for making a preform loose body according to claim 1, wherein the side of the blowup surface facing the chuck axis is an arcuate surface.
8. A method of making a preform loose body according to claim 1, characterized in that the nozzle holder is fixed in the frame by means of a support frame.
9. A method of making a preform loose body according to claim 1, characterized in that each gas jet stack has at least 3 gas jets and the gas jet stack has an odd number of gas jets.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911191172.0A CN110746107B (en) | 2019-11-28 | 2019-11-28 | Method for manufacturing preform loose body |
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| CN201911191172.0A CN110746107B (en) | 2019-11-28 | 2019-11-28 | Method for manufacturing preform loose body |
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| CN110746107B true CN110746107B (en) | 2022-04-05 |
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| CN114455827B (en) * | 2022-01-13 | 2023-06-16 | 富通集团有限公司 | Optical fiber preform processing method and optical fiber preform |
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| JP2000143268A (en) * | 1998-11-05 | 2000-05-23 | Shin Etsu Chem Co Ltd | Method for drawing end of optical fiber preform and device used therefor |
| JP2000247672A (en) * | 1999-02-25 | 2000-09-12 | Shin Etsu Chem Co Ltd | Method for processing optical fiber preform and processing apparatus therefor |
| CN204675996U (en) * | 2015-04-20 | 2015-09-30 | 通鼎互联信息股份有限公司 | Preform manufacturing installation |
| CN108545925A (en) * | 2018-05-02 | 2018-09-18 | 成都富通光通信技术有限公司 | A kind of prefabricated rods axial direction superthin layer over cladding process |
| CN108585470A (en) * | 2018-05-10 | 2018-09-28 | 成都富通光通信技术有限公司 | A kind of VAD prepares the device and method of highly doped germanium plug |
| CN109678337A (en) * | 2019-02-20 | 2019-04-26 | 无锡市凯灵电子有限公司 | A kind of blowtorch mechanism producing preform |
| CN109912191A (en) * | 2017-02-15 | 2019-06-21 | 天津富通集团有限公司 | The manufacturing process of preform |
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2019
- 2019-11-28 CN CN201911191172.0A patent/CN110746107B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000143268A (en) * | 1998-11-05 | 2000-05-23 | Shin Etsu Chem Co Ltd | Method for drawing end of optical fiber preform and device used therefor |
| JP2000247672A (en) * | 1999-02-25 | 2000-09-12 | Shin Etsu Chem Co Ltd | Method for processing optical fiber preform and processing apparatus therefor |
| CN204675996U (en) * | 2015-04-20 | 2015-09-30 | 通鼎互联信息股份有限公司 | Preform manufacturing installation |
| CN109912191A (en) * | 2017-02-15 | 2019-06-21 | 天津富通集团有限公司 | The manufacturing process of preform |
| CN108545925A (en) * | 2018-05-02 | 2018-09-18 | 成都富通光通信技术有限公司 | A kind of prefabricated rods axial direction superthin layer over cladding process |
| CN108585470A (en) * | 2018-05-10 | 2018-09-28 | 成都富通光通信技术有限公司 | A kind of VAD prepares the device and method of highly doped germanium plug |
| CN109678337A (en) * | 2019-02-20 | 2019-04-26 | 无锡市凯灵电子有限公司 | A kind of blowtorch mechanism producing preform |
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