CN114685040B - Pre-etching equipment and method for polarization-maintaining optical fiber preform - Google Patents
Pre-etching equipment and method for polarization-maintaining optical fiber preform Download PDFInfo
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- CN114685040B CN114685040B CN202111670888.6A CN202111670888A CN114685040B CN 114685040 B CN114685040 B CN 114685040B CN 202111670888 A CN202111670888 A CN 202111670888A CN 114685040 B CN114685040 B CN 114685040B
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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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
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- General Chemical & Material Sciences (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention discloses a device and a method for pre-etching a polarization maintaining optical fiber preform. The hydrofluoric acid tank comprises a tank body for containing hydrofluoric acid, wherein one side of the tank body is provided with a centering boss, and the other side of the tank body is provided with a coordination boss; the centering boss is used for being in close fit with an opening at one side of a pair of through holes of the polarization maintaining optical fiber preform; the coordination boss is used for being hermetically matched with openings on the other sides of the pair of through holes of the polarization maintaining optical fiber perform; the centering boss and the coordination boss are horizontally calibrated, so that the polarization-maintaining optical fiber preform is in a horizontal state when being in closed fit with the centering boss and the coordination boss simultaneously; the tank body is a soaking tank. The method carries out horizontal positioning through the pre-calibrated positioning plug and the locking device, and adopts a soaking method to carry out continuous gradual corrosion, thereby ensuring that the transition curved surface formed after the part of the cladding is repaired is in registration with the position of the stress rod inserted into the through hole, and reducing the reduction of processing precision and the non-roundness of the polarization-maintaining optical fiber preform rod caused by the rotation and the deviation of the transition curved surface formed after the cladding is repaired relative to the position of the stress rod inserted into the through hole.
Description
Technical Field
The invention belongs to the field of optical communication, and particularly relates to a device and a method for etching a polarization maintaining optical fiber preform.
Background
In recent years, the production technology of the domestic optical fiber preform is continuously perfected and advanced, a plurality of manufacturers master the more advanced production technology and gradually form a plurality of optical fiber preform complete equipment providers, at present, most domestic optical fiber preform manufacturers continuously expand production to improve productivity, new optical fiber production enterprises are increased day by day, and the competition is extremely strong, so that the production cost control becomes the core competitiveness of the optical fiber and preform industry.
In the current technology of producing a polarization maintaining optical fiber preform, it is the most direct method to achieve better effect in cost control and to improve the productivity and yield of the preform.
The panda type polarization maintaining fiber has the characteristics of high double refraction efficiency, simple structure, high manufacturing efficiency and flexible manufacturing method. The manufacturing process is generally a combined method, namely, firstly, a core rod and a stress rod are manufactured in a deposition mode, then, the core rod is wrapped to obtain an optical fiber preform rod containing the core rod, two holes are punched in symmetrical positions of the two sides of the core rod on the preform rod, and the stress rod is inserted into the holes to form the combined rod. And drawing the combined rod to obtain the panda type polarization maintaining optical fiber. Bowtie-type polarization maintaining fibers are similar.
In order to ensure that the stress rod is smoothly inserted into the hole of the perforated preform, the diameter of the hole needs to be larger than the outer diameter of the stress rod, and the loss of the glass material at the part between the stress rod and the hole can cause the roundness of the cladding of the produced polarization-maintaining optical fiber to be degraded, thereby influencing the application of the optical fiber. In order to ensure that the non-circularity of the cladding of the produced polarization maintaining optical fiber is low, chinese patent document CN101387720A provides a method for preparing a polarization maintaining optical fiber, which is characterized in that a part of the cladding is repaired in a transition curve manner on the upper and lower peripheral surfaces of an optical fiber preform parallel to the central connecting line of two holes of an insertion stress rod, and the repair can use a hydrofluoric acid continuous gradual corrosion method, namely front etching, or a mechanical grinding and polishing method, so that the surface of the optical fiber preform is smooth and continuous, and the cross section is oval or elliptical.
Disclosure of Invention
Aiming at the defects or the improvement requirements in the prior art, the invention provides equipment and a method for pre-etching a polarization-maintaining optical fiber preform, aiming at ingeniously utilizing a through hole for inserting a stress rod on the polarization-maintaining optical fiber preform as a supporting and positioning device for pre-etching, ensuring that the position of a curved surface of the polarization-maintaining optical fiber preform relative to the through hole for inserting the stress rod when the over-curved surface etching is carried out, and avoiding the problem that the curved surface processing cannot be positioned and the position of the curved surface processing relative to the stress rod rotates or deviates during the pre-etching, thereby solving the technical problems that the polarization-maintaining optical fiber preform has certain out-of-roundness and the processing precision still has the improvement requirement.
In order to achieve the above object, according to one aspect of the present invention, there is provided a polarization maintaining optical fiber preform front etching apparatus, comprising a tank for holding hydrofluoric acid, the tank having a centering boss at one side and a coordination boss at the other side;
the centering boss is used for being in close fit with an opening at one side of a pair of through holes of the polarization maintaining optical fiber preform;
the coordination boss is used for being hermetically matched with openings on the other sides of the pair of through holes of the polarization maintaining optical fiber perform;
the centering boss and the coordination boss are horizontally calibrated, so that the polarization-maintaining optical fiber preform is in a horizontal state when being in closed fit with the centering boss and the coordination boss simultaneously;
the tank body is a soaking tank.
Preferably, the centering boss of the front etching device for the polarization maintaining optical fiber perform comprises a pair of boss plugs with a horizontal geometric center connecting line, and the boss plugs of the centering boss are used for being hermetically matched with one side opening of the through hole of the polarization maintaining optical fiber perform, so that the through hole center connecting line of the polarization maintaining optical fiber perform is horizontal in the processing process.
Preferably, the coordination boss of the etching equipment before the polarization maintaining optical fiber preform comprises a pair of boss plugs with a horizontal geometric center connecting line, and the boss plugs of the coordination boss are used for being hermetically matched with the openings on the other side of the through hole of the polarization maintaining optical fiber preform, so that the through hole center connecting line of the polarization maintaining optical fiber preform is horizontal in the processing process.
Preferably, in the etching device before the polarization maintaining optical fiber preform, the boss plug of the centering boss and/or the coordination boss is in interference fit with the through hole opening of the polarization maintaining optical fiber preform.
Preferably, in the front etching device for the polarization maintaining optical fiber preform, the centering boss of the front etching device is provided with a transmission mechanism, preferably a gear transmission mechanism, for driving the centering boss to horizontally turn over; the coordination boss is matched with the groove body through a wheel shaft, so that the coordination boss rotates around the axis along with the overturning of the centering boss, and the optical fiber perform is always horizontal.
Preferably, in the front etching device for the polarization maintaining optical fiber preform, a telescopic and adjustable end retraction mechanism is arranged between the coordination boss and the groove body.
Preferably, the groove body of the front etching device for the polarization maintaining optical fiber preform is provided with an anticorrosive heater and/or a liquid level control device, and the anticorrosive heater is arranged at the bottom of the groove body.
Preferably, the equipment for etching the polarization maintaining optical fiber preform comprises a cabinet body, wherein the cabinet body comprises an upper operation area and a lower device area; the operation area is used for embedding the tank body and the transmission structure thereof, and the device area is provided with an acid tank, an acid barrel, a pump body, and a pipeline and a valve which are required by automatic control; the top of the cabinet body is provided with a negative pressure air draft system.
According to another aspect of the invention, a method for pre-etching a polarization maintaining optical fiber preform is provided, and the device for pre-etching the polarization maintaining optical fiber preform is applied.
Preferably, the method for pre-etching the polarization maintaining optical fiber preform comprises the steps of clamping the polarization maintaining optical fiber preform to be pre-etched into the groove body through a centering boss and a coordination boss, keeping the polarization maintaining optical fiber preform horizontal, and preferably keeping the central connecting line of a through hole of the polarization maintaining optical fiber preform horizontal; preferably, removing part of the coating by adopting an automatic continuous gradual corrosion processing transition curved surface; more preferably, a transmission mechanism is adopted to drive the polarization maintaining optical fiber perform to automatically and horizontally overturn for double-sided processing.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
according to the pre-etching equipment for the polarization maintaining optical fiber preform, the polarization maintaining optical fiber preform which needs to be pre-etched and is provided with the pair of through holes for inserting the stress rods is horizontally positioned through the pre-calibrated positioning plug and the locking device, continuous and gradual corrosion is carried out by adopting a soaking method, the registration of the transition curved surface formed after the partial cladding is repaired and the position of the stress rods inserted into the through holes is ensured, the reduction of the processing precision and the out-of-roundness of the polarization maintaining optical fiber preform caused by the rotation and the deviation of the transition curved surface formed after the cladding is repaired and inserted into the through holes relative to the position of the stress rods is reduced, and the performance of the prepared polarization maintaining optical fiber is finally improved.
The method for etching the polarization maintaining optical fiber preform rod effectively improves the processing precision of the polarization maintaining optical fiber and reduces processing defects.
According to the optimal scheme, the control system automatically detects and monitors the liquid level of the acid liquor and constantly controls the temperature of the acid liquor, so that the corrosion amount of the acid liquor is ensured, and the etching precision of the preform is improved; the program automatically completes the preform etching and shaping process according to the set parameters, realizes the automatic horizontal turnover of the workpiece at 180 degrees, automatically discharges acid and cleans after corrosion, reduces manual operation, and improves production efficiency; the equipment is additionally provided with a plurality of safety alarm devices, so that potential danger is avoided, and safe production is ensured.
Drawings
FIG. 1 is a front view of a pre-etching apparatus for a polarization maintaining optical fiber preform according to the present invention;
FIG. 2 is a schematic view of a centering boss configuration;
FIG. 3 is a top view of the trough portion;
FIG. 4 is an external view of a pre-etching apparatus for a polarization maintaining optical fiber preform according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The pre-etching of the polarization-maintaining optical fiber preform refers to a processing process of repairing a partial coating in advance by a wet method and then inserting a stress rod to manufacture a final polarization-maintaining optical fiber preform, and compared with a method of manufacturing a prototype cross section by machining after inserting a stress rod, the method can improve the quality and processing defects of the polarization-maintaining optical fiber preform.
The invention provides a front etching device for a polarization maintaining optical fiber preform, which comprises a groove body for containing hydrofluoric acid, wherein a centering boss is arranged on one side of the groove body, and a coordination boss is arranged on the other side of the groove body;
the centering boss is used for being hermetically matched with openings on one sides of the pair of through holes of the polarization maintaining optical fiber preform; the centering boss comprises a pair of boss plugs with horizontal geometric center connecting lines as shown in fig. 2, and the boss plugs of the centering boss are used for being hermetically matched with openings on one sides of the through holes of the polarization maintaining optical fiber perform so that the through hole center connecting lines of the polarization maintaining optical fiber perform are horizontal in the processing process. The centering boss is provided with a transmission mechanism, preferably a gear transmission mechanism, and is used for driving the centering boss to horizontally turn.
The coordination boss is used for being in close fit with the openings on the other sides of the through holes of the polarization maintaining optical fiber preform; the structure of the coordination boss is similar to that of the centering boss, a telescopic and adjustable end retraction mechanism is arranged between the coordination boss and the groove body, the overlooking enlarged view of the mechanism is shown in figure 3, the mechanism comprises a pair of boss plugs with a horizontal geometric center connecting line, and the boss plugs of the coordination boss are used for being in close fit with openings on the other side of the through hole of the polarization maintaining optical fiber preform rod, so that the through hole center connecting line of the polarization maintaining optical fiber preform rod is horizontal in the processing process. The coordination boss is matched with the groove body through a wheel shaft, so that the coordination boss rotates around the axis along with the overturning of the centering boss, and the optical fiber perform is always horizontal.
The centering boss and the coordination boss are horizontally calibrated, so that the polarization-maintaining optical fiber preform is in a horizontal state when being in closed fit with the centering boss and the coordination boss simultaneously; preferably, the boss plugs of the centering boss and/or the coordination boss are in interference fit with the through hole openings of the polarization maintaining optical fiber preform.
The tank body is a soaking tank. The tank body is provided with an anti-corrosion heater and/or a liquid level control device, and the anti-corrosion heater is arranged at the bottom of the tank body.
The apparatus further comprises a cabinet comprising an upper operating zone and a lower equipment zone; the operation area is used for embedding the tank body and the transmission structure thereof, and the device area is provided with an acid tank, an acid barrel, a pump body, and a pipeline and a valve which are required by automatic control; the top of the cabinet body is provided with a negative pressure air draft system.
The invention provides a method and equipment which adopt hydrofluoric acid to continuously corrode and can automatically and accurately control and execute aiming at the finishing process of the outer surface of a polarization maintaining optical fiber preform, thereby avoiding excessive manual operation and improving the etching precision and efficiency of the optical fiber preform.
The invention provides a method for etching a polarization maintaining optical fiber preform, which applies the equipment for etching the polarization maintaining optical fiber preform, and comprises the following steps:
and clamping the polarization maintaining optical fiber perform rod to be subjected to front etching into the groove body through the centering boss and the coordination boss, wherein the polarization maintaining optical fiber perform rod is kept horizontal.
Preferably, the central connecting line of the through hole of the polarization maintaining optical fiber preform is horizontal; preferably, removing part of the coating by adopting an automatic continuous gradual corrosion processing transition curved surface; more preferably, a transmission mechanism is adopted to drive the polarization maintaining optical fiber perform to automatically and horizontally turn over for double-sided processing.
The following are examples:
the etching equipment main part before polarization maintaining optical fiber perform that this embodiment provided comprises cabinet body 3 and cell body 6:
the cabinet body 3 is divided into an upper part and a lower part, wherein the upper part is mainly an operation area and is used for embedding an etching tank body 6 and transmission structures 4 and 17 thereof; the lower part is an apparatus area provided with an acid tank 9, an acid barrel 7, a pump body, and a pipeline and a valve required by automatic control. The cabinet body top is negative pressure exhaust system 2, and the room is taken out through this negative pressure exhaust system to inside gas, prevents that the volatile hydrofluoric acid gas in below from revealing. The cabinet body is provided with a leakage-proof disc 8 with leakage detection induction, so that the operation safety of the dust-free room is prevented from being influenced during liquid leakage. The electronic control area maintains a positive pressure to ensure that the components are not corroded by the acid gas and the service life of the components is not affected. An independent transparent window sliding door is arranged on the surface of the cabinet body, so that the interior of the cabinet body can be conveniently inspected.
The tank body 6 is a soaking tank, and the bottom of the tank body is provided with a throwing-in type anti-corrosion heating pipe 19 as an anti-corrosion heater for preheating hydrofluoric acid. The groove body can be used for placing 5 optical fiber preforms at most for etching, and the end locking mechanism 11 is provided with a compensation device and used for compensating the feeding error of +/-70 mm. The other end is a gear transmission mechanism 17, which can realize the on-line 180-degree automatic switching of the corrosion surface after the single-side etching. The tank body is provided with a liquid level control device 15 which can automatically detect the position of the acid liquor and give an alarm when the tank body is at a high position or is in a liquid shortage state. All accessories in the tank body which are directly contacted with the acid liquor are made of plastics.
One side of the tank body is provided with a centering boss 201, and the other side is provided with a coordination boss 202;
the centering boss 201 is used for being in close fit with an opening at one side of a pair of through holes of the polarization maintaining optical fiber preform; as shown in fig. 2, the centering boss 201 includes a pair of boss plugs 210 with a horizontal geometric center line, and the boss plugs 210 of the centering boss 201 are used for being in close fit with one side openings of the through holes of the polarization maintaining optical fiber preform, so that the through hole center line of the polarization maintaining optical fiber preform is horizontal in the processing process. The centering boss 201 is provided with a transmission mechanism, which is a gear transmission mechanism, and is used for driving the centering boss 201 to horizontally turn over.
The coordination boss 202 is used for being in close fit with the openings on the other sides of the through holes of the polarization maintaining optical fiber preform; the structure of the coordination boss 202 is similar to that of the centering boss 201, a telescopic and adjustable end retraction mechanism is arranged between the coordination boss 202 and the groove body, the overlook enlarged view of the mechanism is shown in fig. 3, the mechanism comprises a pair of boss plugs 210 with a horizontal geometric center connecting line, and the boss plugs 210 of the coordination boss 202 are used for being in close fit with openings on the other side of the through holes of the polarization maintaining optical fiber prefabricated rod, so that the through hole center connecting line of the polarization maintaining optical fiber prefabricated rod is horizontal in the processing process. The coordination boss 202 is matched with the groove body through a wheel shaft, so that the coordination boss 202 rotates around the axis along with the overturning of the centering boss 201, and the optical fiber perform is always in a horizontal state.
The centering boss 201 and the coordination boss 202 are horizontally calibrated, so that the polarization-maintaining optical fiber preform is in a horizontal state when being in closed fit with the centering boss 201 and the coordination boss 202 at the same time; preferably, the boss plug 210 of the centering boss 201 and/or the coordination boss 202 is in interference fit with the through hole opening of the polarization maintaining optical fiber preform.
Besides the functions of constant temperature heating of hydrofluoric acid, 180-degree turnover of a workpiece and the like, the control system can also set total corrosion feed amount, can add initial acid liquid to a liquid level tangent to the preform through pump-in and MFC setting, and can also set key parameters required in the liquid adding process of the manufacturing process, such as the number of manufacturing process steps, the manufacturing process time, MFC flow setting and the manufacturing process additional time after turnover. In addition, the functions of multiple automatic liquid medicine stirring circulation, acid discharge after the manufacture procedure is finished and cleaning can be additionally realized.
The safety device of the embodiment comprises a leakage-proof disc of the whole base of the machine, liquid level detection devices of all groove bodies, leakage detection and notification systems of all layers of plates, overtemperature protection devices with all heating functions, leakage protection devices, emergency shutdown devices and other operation safety warning marks.
The working process of the embodiment is as follows:
and (3) clamping and calibrating, namely manually loading the polarization maintaining optical fiber preform needing etching into the operating platform groove body, and checking without errors after the polarization maintaining optical fiber preform is installed in place and locked. The method specifically comprises the following steps:
before the polarization maintaining optical fiber perform is etched by hydrofluoric acid, clamping is needed, a large protection door 1 in the middle of the cabinet body is lifted up first, and operation is carried out on a groove body part 6. First step turns up stroke apron 10 earlier, then puts into the polarization maintaining optical fiber perform that needs the etching, and this polarization maintaining optical fiber perform has been beaten two through-holes that are used for inserting the stress stick, can place 5 at most, need put into the compensation stick in order to guarantee the etching precision when less than 5. Then, the left side of the through hole of the polarization maintaining optical fiber preform is inserted into the matched centering boss 201, and then the right side is inserted into the coordination boss 202 of the locking device 11. After centering, the horizontal calibration of the polarization maintaining optical fiber preform is ensured, and the lower part of the locking device 11 is provided with a length compensation structure which can be used for compensating the feeding error of +/-70 mm. And locking the 11 after the bar stock or the compensating bar is installed. After the above steps are manually operated, the automatic etching process of the preform can be started without error.
On the operation interface of the PC end 13, key parameters such as total etching time, total etching steps, total etching feed amount and the like are input, self-defined parameters such as flow ratio, the number of times of stirring circulation of the liquid medicine and the number of times of cleaning after the process is finished can also be set, and the program is started to run after the self-defined parameters are confirmed. The control system detects the temperature and the liquid level of the hydrofluoric acid solution through the sensor, then utilizes the actuating mechanism to automatically adjust the power of the heating pipe, and starts or closes the corresponding pipeline valve and the pump to enable the hydrofluoric acid to reach the preset temperature and liquid level. The initial acid liquid is firstly added to the liquid level tangent to the preform, then the program starts to feed and supplement hydrofluoric acid according to set parameters, multiple corrosion cycles are automatically completed, the sensor can detect the etching amount of the preform, and the hydrofluoric acid feeding amount and the corrosion time are automatically adjusted. After the etching amount meets the requirement, the system can drain part of acid liquor, then the workpiece is automatically turned over by 180 degrees by using the transmission device 4, and the etching and shaping of the other surface are started. The etching process is the same as above.
When both sides of the polarization maintaining optical fiber perform rod are finished with preset etching shaping, the system starts to execute thorough acid discharging and cleaning procedures. The liquid discharge pipeline 20 is opened, hydrofluoric acid in the groove body 6 is continuously discharged out of the device, when the sensor detects that no acid liquid flows out of the groove body, clear water is injected inwards to dilute and clean, and the diluent is discharged after a period of time. After the system is automatically and circularly cleaned for multiple times, the whole etching operation process is finished, and the equipment is restored to the initial state. The cabinet body is also internally provided with a water-air gun for manually cleaning the inner dead angle part.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A front etching device for a polarization maintaining optical fiber preform is characterized by comprising a groove body for containing hydrofluoric acid, wherein one side of the groove body is provided with a centering boss, and the other side of the groove body is provided with a coordination boss;
the centering boss is used for being in close fit with an opening at one side of a pair of through holes of the polarization maintaining optical fiber preform; the centering boss comprises a pair of boss plugs of which the geometric center connecting line is horizontal, and the boss plugs of the centering boss are used for being hermetically matched with one side opening of the through hole of the polarization maintaining optical fiber perform to ensure that the through hole center connecting line of the polarization maintaining optical fiber perform is horizontal in the processing process; the centering boss is provided with a transmission mechanism and is used for driving the centering boss to horizontally turn over;
the coordination boss is used for being in close fit with the openings on the other sides of the through holes of the polarization maintaining optical fiber preform; the coordination boss comprises a pair of boss plugs with a horizontal geometric center connecting line, and the boss plugs of the coordination boss are used for being hermetically matched with the openings on the other side of the through holes of the polarization maintaining optical fiber prefabricated rod so that the through hole center connecting line of the polarization maintaining optical fiber prefabricated rod is horizontal in the processing process; the coordination boss is matched with the groove body through a wheel shaft, so that the coordination boss rotates around the axis along with the overturning of the centering boss, and the optical fiber preform is always horizontal;
the centering boss and the coordination boss are horizontally calibrated, so that the polarization-maintaining optical fiber preform is in a horizontal state when being in closed fit with the centering boss and the coordination boss simultaneously;
the tank body is a soaking tank.
2. The apparatus for pre-etching a polarization maintaining optical fiber preform of claim 1, wherein the boss plugs of the centering boss and/or the coordination boss are in interference fit with the through hole openings of the polarization maintaining optical fiber preform.
3. The apparatus for pre-etching a polarization maintaining optical fiber preform of claim 1, wherein the transmission mechanism is a gear transmission mechanism.
4. The apparatus for pre-etching a polarization maintaining optical fiber preform of claim 1, wherein a telescopically adjustable end retraction mechanism is provided between the coordination boss and the groove body.
5. The apparatus for pre-etching a polarization maintaining optical fiber preform according to claim 1, wherein the tank has an anticorrosive heater disposed at the bottom of the tank and/or a liquid level control device.
6. The apparatus for pre-etching a polarization maintaining optical fiber preform of claim 1, comprising a cabinet comprising an upper operating region and a lower apparatus region; the operation area is used for embedding the tank body and the transmission structure thereof, and the device area is provided with an acid tank, an acid barrel, a pump body, and a pipeline and a valve which are required by automatic control; the top of the cabinet body is provided with a negative pressure air draft system.
7. A method of pre-etching a polarization maintaining optical fiber preform, characterized by using the apparatus of any one of claims 1 to 6.
8. The method for pre-etching a polarization maintaining optical fiber preform according to claim 7, wherein the polarization maintaining optical fiber preform to be pre-etched is clamped into the groove by a centering boss and a coordination boss and the polarization maintaining optical fiber preform is kept horizontal.
9. The method of pre-etching a polarization maintaining optical fiber preform of claim 7, wherein the through-hole center line of the polarization maintaining optical fiber preform is horizontal.
10. The method of pre-etching a polarization maintaining optical fiber preform of claim 7, wherein the step of removing the overclad portion is performed by an automated continuous gradual etch process.
11. The method of pre-etching a polarization maintaining optical fiber preform of claim 7, wherein a transmission mechanism is used to drive the polarization maintaining optical fiber preform to automatically turn horizontally for double-sided processing.
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| JP2004043198A (en) * | 2002-07-08 | 2004-02-12 | Furukawa Electric Co Ltd:The | Method of cleaning optical fiber preform |
| CN1410375A (en) * | 2002-11-14 | 2003-04-16 | 江苏法尔胜光子有限公司 | Structure and manufacturing method of elliptical jacket type premade stick and light bias fiber |
| CN207347399U (en) * | 2017-10-16 | 2018-05-11 | 长飞光纤光缆股份有限公司 | A kind of preform casing clamping device |
| CN107902886A (en) * | 2017-12-21 | 2018-04-13 | 上海塑洁环保工程设备有限公司 | Preform pickler |
| CN207699454U (en) * | 2017-12-21 | 2018-08-07 | 上海塑洁环保工程设备有限公司 | Preform rotary support mechanism and preform acid dip pickle |
| CN207699450U (en) * | 2017-12-21 | 2018-08-07 | 上海塑洁环保工程设备有限公司 | Preform pickler |
| CN210595812U (en) * | 2019-09-19 | 2020-05-22 | 上海塑洁环保工程设备有限公司 | Horizontal acid dip pickle of optical fiber perform reaches pickling system including it |
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