CN112777928A - Optical fiber preform manufacturing process and optical fiber - Google Patents
Optical fiber preform manufacturing process and optical fiber Download PDFInfo
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- CN112777928A CN112777928A CN202110013427.5A CN202110013427A CN112777928A CN 112777928 A CN112777928 A CN 112777928A CN 202110013427 A CN202110013427 A CN 202110013427A CN 112777928 A CN112777928 A CN 112777928A
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- sintering
- optical fiber
- core rod
- fiber preform
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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]
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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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The application discloses optical fiber perform's manufacturing process includes following steps: 1) preparing a core rod loose body in a reaction furnace by a VAD method; 2) and after the preparation of the core rod loose body is finished, moving the reaction furnace to other stations, re-preparing a new core rod loose body, and moving the previously prepared core rod loose body down to a vertically arranged sintering furnace for dehydration and sintering operation to obtain the core rod. The manufacturing process of the application enables the manufactured loose core rod bodies to be subjected to dehydration and sintering operation on the original station through the rotary reaction furnace, and the reaction furnace after rotation can be matched with other group mechanisms to prepare new loose core rod bodies, so that the production efficiency can be effectively improved.
Description
Technical Field
The invention relates to the field of prefabricated rods, in particular to a manufacturing process of an optical fiber prefabricated rod and an optical fiber.
Background
When the prefabricated rod is prepared by using a VAD + sleeve method or an OVD method, firstly, a loose body of the core rod is prepared by the VAD method, then the loose body is moved out and put into a sintering furnace for dehydration and sintering to prepare the core rod; then, a sleeve is sleeved on the surface of the preform or an outer cladding is prepared to form the preform.
In the prior art, the preparation, dehydration and sintering of the loose body are independent steps, and the repeated disassembly, assembly and transportation of the loose body greatly reduce the production efficiency.
Disclosure of Invention
The invention provides a manufacturing process of an optical fiber preform and an optical fiber aiming at the problems.
The technical scheme adopted by the invention is as follows:
a process for manufacturing an optical fiber preform, comprising the steps of:
1) preparing a core rod loose body in a reaction furnace by a VAD method;
2) and after the preparation of the core rod loose body is finished, moving the reaction furnace to other stations, re-preparing a new core rod loose body, and moving the previously prepared core rod loose body down to a vertically arranged sintering furnace for dehydration and sintering operation to obtain the core rod.
The manufacturing process of the application enables the manufactured loose core rod bodies to be subjected to dehydration and sintering operation on the original station through the rotary reaction furnace, and the reaction furnace after rotation can be matched with other group mechanisms to prepare new loose core rod bodies, so that the production efficiency can be effectively improved.
In one embodiment of the present invention, a sleeve is sleeved on the outer layer of the core rod to form an optical fiber preform; or depositing the outer cladding loose body on the outer layer of the core rod, and sintering the outer cladding loose body to obtain the optical fiber preform.
In one embodiment of the present invention, the steps 1) and 2) are performed by a mandrel manufacturing apparatus, which includes:
a station switching shaft is arranged on the machine seat,
the lifting sintering mechanisms are distributed at intervals around the axis of the station switching shaft;
the reaction furnace is fixed with the station switching shaft through a connecting part; and
the first driving mechanism is used for driving the station switching shaft to rotate and driving the reaction furnace to be matched with one group of lifting sintering mechanisms;
the lifting sintering mechanism comprises:
a column;
the lifting seat is arranged on the upright post in a sliding manner and can move up and down along the upright post;
the rotating chuck is arranged on the lifting seat; and
and the sintering furnace is positioned under the axis of the rotary chuck and is used for dehydrating and sintering the loose core rod bodies, and when the reaction furnace is matched with the lifting sintering mechanism, the reaction furnace is positioned between the rotary chuck and the sintering furnace.
The working process of the mandrel manufacturing equipment comprises the following steps: the first driving mechanism works to enable the reaction furnace to be matched with one group of lifting sintering mechanisms, the reaction furnace is located between the rotary chuck of the group and the sintering furnace, the rotary chuck is used for clamping an auxiliary rod or a target rod, the loose core rod body can be prepared through VAD (vacuum deposition) through the matching of the lifting seat, the rotary chuck and the reaction furnace, after the loose core rod body is prepared, the first driving mechanism works to drive the reaction furnace to rotate to the other adjacent group of lifting sintering mechanisms to perform new manufacturing work of the loose core rod body, and in the previous lifting sintering mechanism, the lifting seat moves downwards to drive the loose core rod body to move to the sintering furnace below to perform dehydration and sintering operations.
In one embodiment of the present invention, the present invention further comprises a transmission structure, and the lifting seat reciprocates on the upright post through the transmission structure.
During the actual application, transmission structure can be for ball screw pair structure, rotates on the stand promptly and is provided with the screw rod by motor drive, still includes the track on the stand, and the lift seat slides and sets up on the track, and be fixed with on the lift seat with screw rod complex nut piece, through the rotation of screw rod, the nut piece can drive the accurate removal from top to bottom of lift seat.
In one embodiment of the invention, the sintering furnace further comprises a guide rail, the guide rail is laid on the upper end surface of each sintering furnace, and the lower end of the reaction furnace is provided with a matching part matched with the guide rail.
The stress condition can be improved by the guide rail and the matching part, so that the reaction furnace can be better supported, and the requirements on the structural strength of the connecting part and the station switching shaft are effectively reduced.
In one embodiment of the present invention, the guide rail is a circular guide rail, the guide rail has a limiting groove, the lower portion of the reaction furnace has a supporting portion corresponding to the circular guide rail, the matching portion is a roller mounted on the supporting portion, and the roller is embedded in the limiting groove.
Through the cooperation of spacing groove and gyro wheel, can effectively reduce frictional force, make the reacting furnace rotate convenient and reliable.
In one embodiment of the present invention, the sintering furnace has a through hole at an upper end thereof, and the guide rail is located between the station switching shaft and the through hole.
In one embodiment of the present invention, the lifting seat has a triggering portion thereon;
the lift sintering mechanism still includes the apron subassembly, the apron subassembly includes:
the two trigger plates are arranged on the stand column in a sliding mode, are positioned above the sintering furnace and are adjacent to the sintering furnace, arc-shaped guide parts are arranged at the upper ends of the trigger plates, and guide spaces for the trigger parts to press in are formed between the two arc-shaped guide parts;
the elastic piece is used for being matched with the corresponding trigger plates to enable the two trigger plates to have the movement trend of mutual abutting:
two cover plates are located above the sintering furnace, the two cover plates are fixed with the two trigger plates through connecting rods respectively, when the two trigger plates abut against each other, the two cover plates also abut against each other, the through hole in the sintering furnace can be covered, when the lifting seat moves downwards, the matching part is far away from each other after passing through the guide space, the two cover plates are also far away from each other at the moment, and the through hole is exposed.
Through the cooperation of trigger part and apron subassembly, under sintering furnace non-operating condition, two cover plates can cover the through-hole, and when the lift seat moved down, can open the cover plate voluntarily, make things convenient for the loose body of plug to get into in the sintering furnace.
The elastic piece can be a spring or a spring sheet and the like. During the in-service use, be fixed with the limiting plate on the stand, be fixed with the guide bar on the trigger plate, the guide bar slides and sets up on the limiting plate, and the tip of guide bar has anticreep portion, and the elastic component supports for the spring of overcoat on the guide bar, and the one end and the limiting plate of spring support and lean on, and the other end supports with trigger plate and supports and lean on.
In one embodiment of the present invention, the first driving mechanism is a switching motor.
The application also discloses an optical fiber formed by drawing an optical fiber preform, wherein the optical fiber preform is manufactured by the manufacturing process described above.
The invention has the beneficial effects that: the manufacturing process of the application enables the manufactured loose core rod bodies to be subjected to dehydration and sintering operation on the original station through the rotary reaction furnace, and the reaction furnace after rotation can be matched with other group mechanisms to prepare new loose core rod bodies, so that the production efficiency can be effectively improved.
Description of the drawings:
FIG. 1 is a schematic structural view of a core rod manufacturing apparatus according to embodiment 1;
FIG. 2 is a schematic structural view of a core rod manufacturing apparatus according to embodiment 2;
fig. 3 is an enlarged view of a in fig. 2.
The figures are numbered:
1. a station switching shaft; 2. a lifting sintering mechanism; 3. a reaction furnace; 4. a connecting portion; 5. a first drive mechanism; 6. a column; 7. a lifting seat; 8. rotating the chuck; 9. sintering furnace; 10. a guide rail; 12. a limiting groove; 13. a support portion; 14. a through hole; 15. a trigger section; 16. a trigger plate; 17. an arc-shaped guide part; 18. a guide space; 19. a cover plate; 20. a connecting rod; 21. a limiting plate; 22. a guide bar; 23. an anti-drop part; 24. a loose core rod.
The specific implementation mode is as follows:
the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
A process for manufacturing an optical fiber preform, comprising the steps of:
1) preparing a core rod loose body in a reaction furnace by a VAD method;
2) and after the preparation of the core rod loose body is finished, moving the reaction furnace to other stations, re-preparing a new core rod loose body, and moving the previously prepared core rod loose body down to a vertically arranged sintering furnace for dehydration and sintering operation to obtain the core rod.
The manufacturing process of the application enables the manufactured loose core rod bodies to be subjected to dehydration and sintering operation on the original station through the rotary reaction furnace, and the reaction furnace after rotation can be matched with other group mechanisms to prepare new loose core rod bodies, so that the production efficiency can be effectively improved.
In this embodiment, the method further includes the following steps: sleeving a sleeve on the outer layer of the core rod to form an optical fiber preform; or depositing the outer cladding loose body on the outer layer of the core rod, and sintering the outer cladding loose body to obtain the optical fiber preform.
As shown in fig. 1, in the present embodiment, step 1) and step 2) are performed by a mandrel manufacturing apparatus including:
a station switching shaft 1 is arranged on the machine station switching shaft,
a plurality of groups of lifting sintering mechanisms 2, wherein each group of lifting sintering mechanisms 2 are distributed at intervals around the axis of the station switching shaft 1;
the reaction furnace 3 is fixed with the station switching shaft 1 through a connecting part 4; and
the first driving mechanism 5 is used for driving the station switching shaft 1 to rotate and driving the reaction furnace 3 to be matched with one group of lifting sintering mechanisms 2;
the lifting sintering mechanism 2 includes:
a column 6;
the lifting seat 7 is arranged on the upright post 6 in a sliding manner and can move up and down along the upright post 6;
a rotating chuck 8 mounted on the lifting base 7; and
and the sintering furnace 9 is positioned right below the axis of the rotating chuck 8 and is used for dehydrating and sintering the loose core rod body 24, and when the reaction furnace 3 is matched with the lifting sintering mechanism 2, the reaction furnace 3 is positioned between the rotating chuck 8 and the sintering furnace 9.
The working process of the mandrel manufacturing equipment comprises the following steps: the first driving mechanism 5 works to enable the reaction furnace 3 to be matched with a group of lifting sintering mechanisms 2, at the moment, the reaction furnace 3 is positioned between a rotary chuck 8 and a sintering furnace 9 of the group, the rotary chuck 8 is used for clamping an auxiliary rod or a target rod, a mandrel loose body 24 can be obtained through VAD (vacuum deposition) through the matching of a lifting seat 7, the rotary chuck 8 and the reaction furnace 3, after the mandrel loose body 24 is prepared, the first driving mechanism 5 works to drive the reaction furnace 3 to rotate to the other adjacent group of lifting sintering mechanisms 2 to carry out new manufacturing work of the mandrel loose body 24, and in the previous lifting sintering mechanism 2, the lifting seat 7 moves downwards to drive the mandrel loose body 24 to move to the sintering furnace 9 below to carry out dehydration and sintering operation.
When in actual use, the lifting device also comprises a transmission structure, and the lifting seat 7 moves on the upright post 6 in a reciprocating way through the transmission structure. The transmission structure can be for current all kinds of transmission structures, for example the transmission structure can be ball screw pair structure, rotates on 6 stands promptly and is provided with the screw rod by motor drive, still includes the track on 6 stands, and lift seat 7 slides and sets up on the track, and is fixed with on the lift seat 7 with screw rod complex nut piece, through the rotation of screw rod, the nut piece can drive lift seat 7 accurate removal from top to bottom.
As shown in fig. 1, in the present embodiment, the sintering furnace further includes a guide rail 10, the guide rail 10 is laid on the upper end surface of each sintering furnace 9, and the lower end of the reaction furnace 3 has an engaging portion (not shown) that engages with the guide rail 10. The guide rail 10 and the matching part can improve the stress condition, so that the reaction furnace 3 can be better supported, and the requirements on the structural strength of the connecting part 4 and the station switching shaft 1 are effectively reduced.
In this embodiment, the guide rail 10 is a circular guide rail 10, the guide rail 10 has a limiting groove 12, the lower portion of the reaction furnace 3 has a supporting portion 13 corresponding to the circular guide rail 10, the matching portion is a roller mounted on the supporting portion 13, and the roller is embedded in the limiting groove 12. Through the cooperation of spacing groove 12 and gyro wheel, can effectively reduce frictional force, make reaction furnace 3 rotate convenient reliable.
In this embodiment, the sintering furnace 9 has a through hole 14 at the upper end thereof, and the guide rail 10 is located between the station switching shaft 1 and the through hole 14. In actual use, the first driving mechanism 5 may be a switching motor.
The embodiment also discloses an optical fiber which is formed by drawing the optical fiber preform manufactured by the embodiment.
Example 2
As shown in fig. 2 and 3, the present embodiment is different from embodiment 1 in that: the lifting seat 7 is provided with a triggering part 15, and the lifting sintering mechanism 2 further comprises a cover plate component. The cover plate assembly of the present embodiment includes:
the two trigger plates 16 are arranged on the upright post 6 in a sliding mode, the two trigger plates 16 are positioned above the sintering furnace 9 and are adjacent to the sintering furnace 9, the upper end of each trigger plate 16 is provided with an arc-shaped guide part 17, and a guide space 18 for the trigger part 15 to press in is formed between the two arc-shaped guide parts 17;
an elastic member (not shown) for cooperating with the corresponding trigger plate 16 to make the two trigger plates 16 have a tendency to move against each other:
two cover plates 19 are located above the sintering furnace 9, the two cover plates 19 are respectively fixed with the two trigger plates 16 through connecting rods 20, when the two trigger plates 16 abut against each other, the two cover plates 19 also abut against each other, the through hole 14 in the sintering furnace 9 can be covered, when the lifting seat 7 moves downwards, after the matching part passes through the guide space 18, the two trigger plates 16 are far away from each other, at the moment, the two cover plates 19 are also far away from each other, and the through hole 14 is exposed.
Through the cooperation of the trigger part 15 and the cover plate assembly, the two cover plates 19 can cover the through hole 14 in the non-working state of the sintering furnace 9, and when the lifting seat 7 moves downwards, the cover plates 19 can be automatically opened, so that the mandrel loose bodies 24 can conveniently enter the sintering furnace 9.
In practical application, the elastic member may be a spring or a leaf spring. In this embodiment, be fixed with limiting plate 21 on the stand 6, be fixed with guide bar 22 on the trigger plate 16, guide bar 22 slides and sets up on limiting plate 21, and the tip of guide bar 22 has anticreep portion 23, and the elastic component is the spring of overcoat on guide bar 22, and the one end and the limiting plate 21 of spring support against, and the other end supports against with trigger plate 16.
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 (10)
1. A process for manufacturing an optical fiber preform, comprising the steps of:
1) preparing a core rod loose body in a reaction furnace by a VAD method;
2) and after the preparation of the core rod loose body is finished, moving the reaction furnace to other stations, re-preparing a new core rod loose body, and moving the previously prepared core rod loose body down to a vertically arranged sintering furnace for dehydration and sintering operation to obtain the core rod.
2. The process for fabricating an optical fiber preform according to claim 1, wherein a jacket is provided around the outer layer of the core rod to form an optical fiber preform; or depositing the outer cladding loose body on the outer layer of the core rod, and sintering the outer cladding loose body to obtain the optical fiber preform.
3. The process for manufacturing an optical fiber preform according to claim 1, wherein the steps 1) and 2) are performed by a mandrel manufacturing apparatus comprising:
a station switching shaft is arranged on the machine seat,
the lifting sintering mechanisms are distributed at intervals around the axis of the station switching shaft;
the reaction furnace is fixed with the station switching shaft through a connecting part; and
the first driving mechanism is used for driving the station switching shaft to rotate and driving the reaction furnace to be matched with one group of lifting sintering mechanisms;
the lifting sintering mechanism comprises:
a column;
the lifting seat is arranged on the upright post in a sliding manner and can move up and down along the upright post;
the rotating chuck is arranged on the lifting seat; and
and the sintering furnace is positioned under the axis of the rotary chuck and is used for dehydrating and sintering the loose core rod bodies, and when the reaction furnace is matched with the lifting sintering mechanism, the reaction furnace is positioned between the rotary chuck and the sintering furnace.
4. The process for fabricating an optical fiber preform according to claim 3, further comprising a driving structure by which the lift base reciprocates on the column.
5. The process for manufacturing an optical fiber preform according to claim 3, further comprising a guide rail laid on an upper end surface of each sintering furnace, and a lower end of the reaction furnace having a fitting portion to be fitted with the guide rail.
6. The process for fabricating an optical fiber preform according to claim 5, wherein the guide rail is a circular guide rail having a stopper groove thereon, the lower portion of the reaction furnace has a support portion corresponding to the circular guide rail, and the fitting portion is a roller installed on the support portion, the roller being inserted into the stopper groove.
7. The process for fabricating an optical fiber preform according to claim 5, wherein the sintering furnace has a through hole at an upper end thereof, and the guide rail is positioned between the station-switching shaft and the through hole.
8. The process for fabricating an optical fiber preform according to claim 7, wherein the lift base has a triggering portion thereon;
the lift sintering mechanism still includes the apron subassembly, the apron subassembly includes:
the two trigger plates are arranged on the stand column in a sliding mode, are positioned above the sintering furnace and are adjacent to the sintering furnace, arc-shaped guide parts are arranged at the upper ends of the trigger plates, and guide spaces for the trigger parts to press in are formed between the two arc-shaped guide parts;
the elastic piece is used for being matched with the corresponding trigger plates to enable the two trigger plates to have the movement trend of mutual abutting:
two cover plates are located above the sintering furnace, the two cover plates are fixed with the two trigger plates through connecting rods respectively, when the two trigger plates abut against each other, the two cover plates also abut against each other, the through hole in the sintering furnace can be covered, when the lifting seat moves downwards, the matching part is far away from each other after passing through the guide space, the two cover plates are also far away from each other at the moment, and the through hole is exposed.
9. The process for making an optical fiber preform according to claim 3, wherein the first driving mechanism is a switching motor.
10. An optical fiber formed by drawing an optical fiber preform, the optical fiber preform being produced by the production process of claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110013427.5A CN112777928B (en) | 2021-01-06 | 2021-01-06 | Optical fiber preform manufacturing process and optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110013427.5A CN112777928B (en) | 2021-01-06 | 2021-01-06 | Optical fiber preform manufacturing process and optical fiber |
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| CN112777928A true CN112777928A (en) | 2021-05-11 |
| CN112777928B CN112777928B (en) | 2022-10-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113511806A (en) * | 2021-07-02 | 2021-10-19 | 浙江富通光纤技术有限公司 | Machining method of mandrel |
| CN113666625A (en) * | 2021-07-30 | 2021-11-19 | 浙江富通光纤技术有限公司 | Method for processing prefabricated rod |
| CN113698089A (en) * | 2021-08-02 | 2021-11-26 | 浙江富通光纤技术有限公司 | Machining method of core rod |
| CN114031286A (en) * | 2021-10-28 | 2022-02-11 | 浙江富通光纤技术有限公司 | Processing technology of prefabricated rod and prefabricated rod |
| CN114524610A (en) * | 2022-02-28 | 2022-05-24 | 浙江富通光纤技术有限公司 | Processing technology of optical fiber preform and optical fiber |
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| CN110204190A (en) * | 2019-07-12 | 2019-09-06 | 杭州金星通光纤科技有限公司 | A kind of manufacturing method and device of ultra-low loss single mode optical fiber |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113511806A (en) * | 2021-07-02 | 2021-10-19 | 浙江富通光纤技术有限公司 | Machining method of mandrel |
| CN113666625A (en) * | 2021-07-30 | 2021-11-19 | 浙江富通光纤技术有限公司 | Method for processing prefabricated rod |
| CN113698089A (en) * | 2021-08-02 | 2021-11-26 | 浙江富通光纤技术有限公司 | Machining method of core rod |
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| CN114031286A (en) * | 2021-10-28 | 2022-02-11 | 浙江富通光纤技术有限公司 | Processing technology of prefabricated rod and prefabricated rod |
| CN114031286B (en) * | 2021-10-28 | 2023-08-25 | 浙江富通光纤技术有限公司 | Processing technology of preform and preform |
| CN114524610A (en) * | 2022-02-28 | 2022-05-24 | 浙江富通光纤技术有限公司 | Processing technology of optical fiber preform and optical fiber |
| CN114524610B (en) * | 2022-02-28 | 2023-08-08 | 浙江富通光纤技术有限公司 | Optical fiber preform processing technology and optical fiber |
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| CN112777928B (en) | 2022-10-28 |
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