CN113311110A - Optical fiber chemical corrosion method - Google Patents
Optical fiber chemical corrosion method Download PDFInfo
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- CN113311110A CN113311110A CN202110539653.7A CN202110539653A CN113311110A CN 113311110 A CN113311110 A CN 113311110A CN 202110539653 A CN202110539653 A CN 202110539653A CN 113311110 A CN113311110 A CN 113311110A
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
- G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
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Abstract
The invention provides a chemical corrosion method for optical fibers, which comprises the following steps: 1) positioning the optical fibers to be corroded in batches by adopting a clamp disc; 2) driving a clamp disc to descend, and descending a to-be-corroded part of the to-be-corroded optical fiber into a sulfuric acid solution pool for first corrosion, wherein the mass percentage of sulfuric acid in the sulfuric acid solution is 90% -98%, the corrosion temperature is 130 +/-2 ℃, and the corrosion time is 5-10 minutes; 3) driving the clamp disc to move, moving the optical fiber to be corroded out of the sulfuric acid solution tank, and moving the optical fiber to be corroded to a clean water tank for cleaning; 4) driving the clamp disc to move to a hydrofluoric acid tank for secondary corrosion, wherein the mass percent of hydrofluoric acid in the hydrofluoric acid solution is 30-35%, the corrosion temperature is 29 +/-2 ℃, and the corrosion time is 30-45 minutes; 5) and driving the clamp disc to move, moving the optical fiber to be corroded out of the sulfuric acid solution tank, and moving the optical fiber to be corroded to a clean water tank for cleaning. Compared with the prior art, the method has the advantages that the optical fibers with the conventional sizes are sequentially immersed into the sulfuric acid liquid tank and the hydrofluoric acid liquid tank for corrosion, batch corrosion is simultaneously carried out, and the production efficiency is improved.
Description
Technical Field
The invention relates to the field of optical fibers, in particular to a chemical corrosion method for optical fibers.
Background
The development trend of optical communication is integration, full optical fiber and miniaturization. As technology advances in optical communication systems, more and more functional devices are concentrated in one subsystem, so that more functional products are concentrated in one device in order to reduce the volume and material of the system, and thus, N × N multi-dimensional optical devices are developed. Fig. 1 shows a conventional optical fiber for optical communication, in which the diameter of the coating layer 1 is 242 ± 5um, the diameter of the cladding layer 2 is 125.0 ± 0.7um, and the diameter of the core 3 of the ordinary single-mode optical fiber is about 9 um. The array fiber and other components are used in the aspects of multi-wavelength laser arrays, photon receiving and transmitting, optical switching and routing, optical delay and storage, all-optical signal processing, multi-dimensional optical transmission and the like. . The diameter requirement of each optical fiber under the array environment is strict, the required precision is +/-0.5 um, and batch consistency in the same capillary or V groove is required to be less than or equal to 0.5 um. However, in the conventional optical fiber manufacturing, the consistency of the same optical fiber batch cannot be ensured due to the processing time.
Disclosure of Invention
Aiming at the problems, the invention provides a chemical corrosion method for optical fibers, which can safely produce high-precision optical fibers with fine diameters and good batch cutting performance, improve the production efficiency and reduce the production cost.
The technical scheme adopted by the invention is as follows:
a chemical corrosion method for optical fiber is characterized by comprising the following steps:
1) positioning the optical fibers to be corroded in batches by adopting a clamp disc;
2) driving a clamp disc to descend, and descending a to-be-corroded part of the to-be-corroded optical fiber into a sulfuric acid solution pool for first corrosion, wherein the mass percentage of sulfuric acid in the sulfuric acid solution is 90% -98%, the corrosion temperature is 130 +/-2 ℃, and the corrosion time is 5-10 minutes;
3) driving the clamp disc to move, moving the optical fiber to be corroded out of the sulfuric acid solution tank, and moving the optical fiber to be corroded to a clean water tank for cleaning;
4) moving the cleaned optical fiber to be corroded to the position above the hydrofluoric acid liquid pool by the clamp disc, descending the part to be corroded of the optical fiber to be corroded into the hydrofluoric acid liquid pool for secondary corrosion, wherein the mass percentage of hydrofluoric acid in the hydrofluoric acid liquid is 30-35%, the corrosion temperature is 29 +/-2 ℃, and the corrosion time is 30-45 minutes;
5) and moving the corroded optical fiber to a cleaning pool by using the clamp disc for cleaning.
Preferably, before the optical fiber to be corroded in the step 1) is corroded, the optical fiber to be corroded is placed under an ion blower for blowing and showering for 3-6 hours.
Preferably, a plant oil layer is attached to the hydrofluoric acid liquid in the hydrofluoric acid liquid tank in the step 4), and the thickness of the plant oil layer is 0.1-0.3 mm.
Preferably, a plurality of positioning grooves for positioning the optical fiber to be corroded are arranged in the clamp disc adopted in the step 1), and the part to be corroded of the optical fiber to be corroded extends out of the clamp disc.
Preferably, a plurality of clamp discs are installed on the clamp disc support frame in batches after a plurality of optical fibers are installed on the clamp discs, the clamp disc support frame is connected with the mechanical arm, the mechanical arm is connected with a control console, the control console comprises a temperature control system, a detection system and a motion system, and the motion system and the detection system are connected with the mechanical arm.
Preferably, the sulfuric acid liquid tank in the step 2) and the hydrofluoric acid liquid tank in the step 4) are both provided with a temperature control conduit for controlling the temperature of the liquid, and the temperature control system is connected with the temperature control conduit.
Preferably, an ultrasonic system is arranged in the cleaning pool in the step 3) and the step 5).
Compared with the prior art, the invention has the beneficial effects that: the invention provides a chemical corrosion method for optical fibers, which comprises the steps of immersing the part to be corroded of an optical fiber with a conventional size into a sulfuric acid liquid tank and a hydrofluoric acid liquid tank in sequence for corrosion, corroding an optical fiber coating layer by sulfuric acid, corroding an optical fiber cladding by hydrofluoric acid, and setting the corrosion time to reach a target diameter value according to needs, so that the optical fiber can be corroded simultaneously in batches, the consistency of batch production is ensured, the production efficiency is improved, and the production cost is reduced. Moreover, full-automatic corrosion equipment can be developed, the contact of personnel with acid liquor is reduced, and the production safety is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional optical fiber according to the prior art;
FIG. 2 is a schematic flow chart illustrating the movement of an optical fiber to be etched in a chemical etching method for an optical fiber according to the present invention;
FIG. 3 is a schematic diagram of a fixture disk for clamping an optical fiber to be etched in the optical fiber chemical etching method according to the present invention;
FIG. 4 is a schematic diagram of a sulfuric acid bath in a chemical fiber etching method according to the present invention;
FIG. 5 is a schematic diagram of a hydrofluoric acid liquid bath in a chemical etching method for optical fiber according to the present invention;
FIG. 6 is a schematic view of a cleaning tank in a chemical etching method for optical fiber according to the present invention;
FIG. 7 is a table showing the data of 100 fibers etched by the chemical etching method.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 to 6 show a preferred embodiment of a method for chemically etching an optical fiber according to the present invention. As shown in fig. 2 to 6, the method for chemically etching an optical fiber includes the following steps: 1) positioning the optical fibers to be corroded in batches by using a clamp disc 10; 2) driving the clamp disc 10 to descend, and descending the part to be corroded of the optical fiber to be corroded into a sulfuric acid liquid pool 20 for first corrosion, wherein the mass percentage of sulfuric acid in the sulfuric acid liquid is 90-98%, the corrosion temperature is 130 +/-2 ℃, and the corrosion time is 5-10 minutes; 3) driving the clamp disc 10 to move, moving the optical fiber to be corroded out of the sulfuric acid solution tank 20, and moving the optical fiber to be corroded to a clean water tank 30 for cleaning; 4) moving the cleaned optical fiber to be corroded to the position above a hydrofluoric acid liquid pool 40 by a clamp disc, descending the clamp disc 10, descending the part to be corroded of the optical fiber to be corroded into the hydrofluoric acid liquid pool for secondary corrosion, wherein the mass percentage of hydrofluoric acid in the hydrofluoric acid liquid is 30-35%, the corrosion temperature is 29 +/-2 ℃, and the corrosion time is 30-45 minutes; 5) the corroded optical fiber is moved to a cleaning pool 30 by using a clamp disc to be cleaned; the method comprises the following steps of immersing the part to be corroded of the optical fiber with the conventional size into a sulfuric acid liquid tank and a hydrofluoric acid liquid tank in sequence for corrosion, corroding an optical fiber coating layer by sulfuric acid, corroding an optical fiber cladding by hydrofluoric acid, setting corrosion time as required to reach a target diameter value, and thus, simultaneously corroding the optical fiber in batches, improving the production efficiency and reducing the production cost.
As shown in fig. 3, the optical fiber 100 is positioned in batch by the fixture disk 10, a plurality of positioning grooves 11 for positioning the optical fiber to be corroded are arranged in the fixture disk 10, the positioning grooves 11 are V-shaped grooves, the positions 101 to be corroded on the optical fiber 100 extend out of the positioning grooves 11, the fixture disk 10 clamps a plurality of optical fibers by using the positioning grooves 11, and then the optical fiber clamped on the fixture disk is cut to be flush and fixed on a corrosion machine. After a plurality of optical fibers are installed on the plurality of clamp discs 10, the optical fibers are installed on the machine clamp disc support frame 50 in batches, and the protection device is closed (such as a machine door or window, a ventilation hole and other openable and closable equipment); the depth of the fiber drop below the liquid level and the erosion time are then controlled by the set program. The optical fiber to be corroded is moved to the positions above the sulfuric acid liquid pool 20, the cleaning pool 30, the hydrofluoric acid liquid pool 40 and the cleaning pool 30, the lifting action is completed under the driving of a mechanical arm 60, the optical fiber clamp disc 10 is driven by the mechanical arm 60 to move, a clamp disc support frame 50 is installed at the end of the mechanical arm 60, and the mechanical arm 60 is a constant-speed electric motor control system and can bear certain mass and guarantee the movement in a space according to instructions. The robotic arm 60 is connected to a control console that also includes a temperature control system, a detection system, and a motion system, both of which are connected to the robotic arm.
Before the optical fiber to be corroded in the step 1) is corroded, putting the optical fiber to be corroded into an ion fan for blowing and showering for 3-6 hours; the raw material of the optical fiber is high-purity quartz glass, the glass is easy to generate static electricity (air friction and other factors) to adsorb dust particles, and after the dust is adsorbed on the surface of the optical fiber, the phenomenon of uneven corrosion can occur after the reaction in acid liquor, so that the product fails; therefore, after the optical fiber is cut into fibers with fixed length, the optical fiber is placed under an ion blower in batches for blowing and spraying for 3-6 hours, static electricity generated by moving and rubbing of the optical fiber in the air is removed, the corrosion effect caused by the tiny dust adhered to the optical fiber in the air is avoided, and the fact that the product yield is influenced due to the fact that the optical fiber is not adsorbed on the front surface of the optical fiber immersed in an acid tank is guaranteed.
The sulfuric acid solution pool 20 in the step 2) and the hydrofluoric acid solution pool 40 in the step 4) are both provided with a temperature control conduit 201 for controlling the temperature of the solution, and a temperature control system is connected with the temperature control conduit and can set a temperature range according to a processing technology to heat or refrigerate so that the corrosion speed of the part to be corroded in the acid solution pool in each direction and surface is basically the same.
As shown in fig. 4, in step 2), the mechanical arm 60 drives the chuck support 50 to move above the sulfuric acid solution tank 20, and slowly descend into the sulfuric acid solution tank 20, where the descending depth is designed according to the target length of the corrosion region. The sulfuric acid in the sulfuric acid liquid pool 20 reacts with the coating on the optical fiber to be corroded to corrode the coating on the part to be corroded. After the set time of concentrated sulfuric acid corrosion is completed, the mechanical arm 60 lifts the clamp tray support frame 50 from the concentrated sulfuric acid tank and moves the clamp tray support frame to the cleaning tank to clean the surface concentrated sulfuric acid residue. As a first preferred embodiment, the mass percentage of sulfuric acid in the sulfuric acid solution is 98%, the corrosion temperature is 130 ℃, and the corrosion time is 5 minutes; as a second embodiment, the mass percentage of sulfuric acid in the sulfuric acid solution is 90%, the corrosion temperature is 130 ℃, and the corrosion time is 10 minutes; as a third example, the mass percentage of sulfuric acid in the sulfuric acid solution is 96, the corrosion temperature is 130 ℃, and the corrosion time is 8 minutes.
As shown in fig. 5, in step 4), after the cleaning is completed, the mechanical arm 60 drives the fixture disk support 50 to move to above the hydrofluoric acid liquid tank 40, and slowly descend into the hydrofluoric acid liquid tank 40, where the descending depth is designed according to the target length of the corrosion region. The cladding of the optical fiber is subjected to uniform chemical reaction in hydrofluoric acid, the corrosion speed of the optical fiber immersed in the acid solution in all directions is basically the same, and the corrosion speed mainly depends on the chemical components of the material of the optical fiber, the mass percentage of the hydrofluoric acid and the temperature; the etch time is set as required to achieve the target diameter value. The corrosion speed of the optical fiber immersed in hydrofluoric acid in all directions is basically the same, and the actual diameter deviation is less than 0.5um after the corrosion is finished. In a preferred embodiment, the hydrofluoric acid solution contains 30% by mass of hydrofluoric acid, the etching temperature is 29 ℃, and the etching time is 40 minutes; as a second embodiment, the hydrofluoric acid solution contains 35% by mass of hydrofluoric acid, and has a corrosion temperature of 31 ℃ and a corrosion time of 30 minutes; in a third embodiment, the hydrofluoric acid solution contains 33% by mass of hydrofluoric acid, and has a etching temperature of 31 ℃ and an etching time of 38 minutes.
In order to realize that a smooth transition area exists between an optical fiber corrosion area and a 125um cladding area, a plant oil layer 41 is attached to hydrofluoric acid liquid in a hydrofluoric acid liquid pool 40 in the step 4), the thickness of the plant oil layer is 0.1-0.3 mm, high-purity plant oil is uniformly attached to the surface of hydrofluoric acid, the siphonage phenomenon is utilized, the corrosion efficiency of optical fibers in the plant oil layer is high when the optical fibers are close to an acid liquid surface (below the plant oil layer), and the corrosion efficiency of the optical fibers far away from the acid liquid surface (above the plant oil layer) is low, so that the smooth transition area is realized. The plant oil layer can effectively avoid the volatilization problem of high temperature of the acid liquor, and the influence on the space environment is reduced.
As shown in fig. 6, the ultrasonic system 31 is disposed in the cleaning tank 30 in step 3) and step 5), and the mechanical arm 60 drives the clamp tray support 50 to move above the cleaning tank 30, and performs a plurality of ascending and descending operations, so that the corroded optical fiber ascends and descends in the cleaning tank 30 to perform a brushing operation. The cleaning pool uses an ultra-pure water system (the resistivity is more than 10M omega cm) to avoid that the surface of the optical fiber to be corroded adsorbs dust or impurities to influence the yield of the consistency of the corrosion diameter of the product. Cleaning the optical fiber to be corroded in the step 3) in the cleaning tank 30, and cleaning the coating and the acid liquor attached to the surface of the optical fiber after the optical fiber to be corroded in the sulfuric acid solution tank 20; in the step 5), the optical fiber to be corroded is cleaned in the cleaning tank 30, and the acid solution attached to the surface of the optical fiber can be cleaned after the optical fiber is corroded in the hydrofluoric acid liquid tank 40.
In addition, aiming at the continuous volatilization and corrosion of sulfuric acid and hydrofluoric acid due to factors such as temperature and the like, a matched wastewater and waste gas treatment facility is installed: the waste gas circulating treatment system is characterized in that air suction equipment is additionally arranged around the two acid liquor pools to collect waste gas and send the waste gas to the treatment pool for neutralization; h2SO4+ 2NaOH= Na2SO4+H2O HF+ NaOH=NaF+H2And 0, detecting the pH of the solution generated after the reaction, neutralizing the solution, collecting the solution, and transferring the solution to a professional treatment unit for treatment.
As shown in fig. 7, the batch processing of 100 optical fibers is performed according to the above steps, the mass percentage of sulfuric acid in the sulfuric acid solution is 95%, the etching temperature is 130 ℃, and the etching time is 5 minutes; 33 percent of hydrofluoric acid in the hydrofluoric acid liquid by mass, 29 ℃ of corrosion temperature and 45 minutes of corrosion time; target diameter of fiber cladding corrosion: 49.5-50.5 um, the uniformity of the head end and the tail end of the corrosion area is less than or equal to 0.5um, and the corrosion area is a good product; the exceeding uniformity of the head end and the tail end of the corrosion area is less than or equal to 0.5um, and the corrosion area is a defective product; among the 100 optical fibers, 94 optical fibers are provided with the uniformity of less than or equal to 0.5um, and 6 optical fibers are provided with the uniformity of more than 0.5um, so that the optical fibers are simultaneously corroded in batches, the consistency of batch production can be ensured, the production efficiency is improved, and the production cost is reduced.
In summary, the technical solutions of the present invention can fully and effectively achieve the above objects, and the structural and functional principles of the present invention have been fully verified in the embodiments, so as to achieve the expected efficacy and objects, and various changes or modifications can be made to the embodiments of the present invention without departing from the principles and spirit of the present invention. Accordingly, this invention includes all modifications encompassed within the scope of the claims appended hereto, and any equivalents thereof which fall within the scope of the claims appended hereto.
Claims (8)
1. A chemical corrosion method for optical fiber is characterized by comprising the following steps:
1) positioning the optical fibers to be corroded in batches by adopting a clamp disc;
2) driving a clamp disc to descend, and descending a to-be-corroded part of the to-be-corroded optical fiber into a sulfuric acid solution pool for first corrosion, wherein the mass percentage of sulfuric acid in the sulfuric acid solution is 90% -98%, the corrosion temperature is 130 +/-2 ℃, and the corrosion time is 5-10 minutes;
3) driving the clamp disc to move, moving the optical fiber to be corroded out of the sulfuric acid solution tank, and moving the optical fiber to be corroded to a clean water tank for cleaning;
4) moving the cleaned optical fiber to be corroded to the position above the hydrofluoric acid liquid pool by the clamp disc, descending the part to be corroded of the optical fiber to be corroded into the hydrofluoric acid liquid pool for secondary corrosion, wherein the mass percentage of hydrofluoric acid in the hydrofluoric acid liquid is 30-35%, the corrosion temperature is 29 +/-2 ℃, and the corrosion time is 30-45 minutes;
5) and moving the corroded optical fiber to a cleaning pool by using the clamp disc for cleaning.
2. The method for chemical etching of optical fiber according to claim 1, wherein: before the optical fiber to be corroded in the step 1) is corroded, the optical fiber to be corroded is firstly placed under an ion fan for blowing and showering for 3-6 hours.
3. The method for chemical etching of optical fiber according to claim 1, wherein: and 4) attaching a plant oil layer on the hydrofluoric acid liquid in the hydrofluoric acid liquid tank in the step 4), wherein the thickness of the plant oil layer is 0.1-0.3 mm.
4. The vegetable oil has the functions of reducing the volatilization of acid liquor and reducing air pollution.
5. The method for chemical etching of optical fiber according to claim 1, wherein: in the step 1), a plurality of positioning grooves for positioning the optical fiber to be corroded are arranged in the fixture disc, and the part to be corroded of the optical fiber to be corroded extends out of the fixture disc.
6. The method for chemical etching of optical fiber according to claim 4, wherein: after a plurality of optical fibers are installed on the clamp discs, the clamp disc support frames are installed on the clamp disc support frames in batches, the clamp disc support frames are connected with the mechanical arm, the mechanical arm is connected with a control console, the control console comprises a temperature control system, a detection system and a motion system, and the motion system and the detection system are connected with the mechanical arm.
7. The method for chemical etching of optical fiber according to claim 5, wherein: the sulfuric acid liquid tank in the step 2) and the hydrofluoric acid liquid tank in the step 4) are both provided with temperature control conduits for controlling the temperature of the liquid, and the temperature control system is connected with the temperature control conduits.
8. The method for chemical etching of optical fiber according to claim 5, wherein: an ultrasonic system is arranged in the cleaning pool in the step 3) and the step 5).
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| CN202110539653.7A CN113311110A (en) | 2021-05-18 | 2021-05-18 | Optical fiber chemical corrosion method |
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| CN202110539653.7A CN113311110A (en) | 2021-05-18 | 2021-05-18 | Optical fiber chemical corrosion method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114355511A (en) * | 2022-01-14 | 2022-04-15 | 武汉锐科光纤激光技术股份有限公司 | Optical fiber etching device |
| CN114355533A (en) * | 2021-12-31 | 2022-04-15 | 江苏永鼎股份有限公司 | Manufacturing method and equipment production line of water-blocking optical fiber unit and water-blocking optical fiber unit |
| CN114368920A (en) * | 2022-01-14 | 2022-04-19 | 武汉锐科光纤激光技术股份有限公司 | Optical fiber etching component |
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