CN116409923A - Preparation method of rare earth doped optical fiber preform rod with large core cladding ratio - Google Patents
Preparation method of rare earth doped optical fiber preform rod with large core cladding ratio Download PDFInfo
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 118
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 109
- 239000013307 optical fiber Substances 0.000 title claims abstract description 73
- 238000005253 cladding Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 239000010453 quartz Substances 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000000151 deposition Methods 0.000 claims abstract description 28
- 230000008021 deposition Effects 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000007524 flame polishing Methods 0.000 claims abstract description 4
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- 239000013522 chelant Substances 0.000 claims description 15
- 239000010410 layer Substances 0.000 claims description 12
- 239000012792 core layer Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- RLOWWWKZYUNIDI-UHFFFAOYSA-N phosphinic chloride Chemical compound ClP=O RLOWWWKZYUNIDI-UHFFFAOYSA-N 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000035876 healing Effects 0.000 claims description 3
- 229910003902 SiCl 4 Inorganic materials 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- -1 rare earth ions Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
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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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
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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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
- C03B37/01815—Reactant deposition burners or deposition heating means
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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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- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention relates to a preparation method of a large core-cladding ratio rare earth doped optical fiber preform, which comprises the steps of shrinking a quartz reaction tube into the rare earth doped optical fiber preform; drilling a rare earth doped core part in the middle of the support rod, and integrally taking out the support rod to form a rare earth doped small-diameter core rod, and welding a quartz rod with the diameter larger than that of the rare earth doped small-diameter core rod at each of two ends of the support rod; performing high-temperature flame polishing treatment on the rare earth doped small-diameter core rod of the welding support rod by using oxyhydrogen flame; a new quartz reaction tube is connected into the MCVD deposition lathe, the core deposition of the preform is carried out according to the method, the treated rare earth doped small diameter core rod is put into the central position of the quartz reaction tube from the left side of the quartz reaction tube, and the support rod is fixed on the MCVD lathe to keep synchronous rotation; and (3) raising the oxyhydrogen flame temperature again, and shrinking the quartz reaction tube and the rare earth doped small-diameter core rod into a solid preform rod to obtain the rare earth doped optical fiber preform rod with large core-in-sheath ratio. The processing difficulty of the preform is reduced, and the doping uniformity of the rare earth doped core is improved.
Description
Technical Field
The invention relates to the field of preparation of special optical fiber preforms, in particular to a preparation method of a large core-cladding ratio rare earth doped optical fiber preform.
Background
Compared with the traditional CO (carbon monoxide) of the fiber laser 2 The laser and the solid laser have the advantages of high electro-optical conversion efficiency, good beam quality, small occupied area and the like, the market of the laser is promoted to be revolutionarily changed, and the laser and the solid laser are widely applied to the fields of industrial manufacture, medical treatment, military national defense and the like. Currently, in the direction of higher power, industrial equipment configured with high-power fiber lasers of kilowatts to tens of thousands of watts will become the mainstream equipment in high-end manufacturing industries. The rare earth doped optical fiber is used as a core device of the optical fiber laser, the rare earth doped optical fiber with large core diameter can generate large mode field gain to realize high-power laser output, and the output power can reach the level of ten watts through a certain design, so that the rare earth doped optical fiber is a key factor for determining the high-power output of the optical fiber laser. The current industrial high-power continuous fiber laser mostly adopts a large-mode-field double-cladding ytterbium-doped fiber, and high-power laser is obtained by combining a plurality of single modules. In the structural design of a laser, key devices such as a gain optical fiber, a high/low reflection grating, an (n+1) x 1 signal/pump coupler and the like are mainly involved, wherein the pump optical fiber used by the (n+1) x 1 signal/pump coupler adopts a rare earth doped optical fiber with a large core-to-package ratio, and an input optical fiber is prepared into an input optical fiber bundle by preprocessing the input signal optical fiber and a plurality of tapered pump optical fibers with the large core-to-package ratio and is connected with a subsequent optical path structure. The large core cladding ratio pump fibers can be arranged closely around the periphery of the pretreated input signal fibers directly or tapered to a set diameter and then arranged closely around the periphery of the input signal fibers. Therefore, the rare-earth doped optical fiber with large core-to-cladding ratio is related to the structure of the high-power continuous fiber laserThe key device is important. Common large core-to-rare earth doped optical fibers have the sizes of 105/125 mu m, 200/220 mu m and 220/242 mu m, and a large core-to-rare earth doped optical fiber structure with the core-to-core ratio of 21:25 and 10:11 is adopted.
Chinese patent publication No. CN102108008A, publication No. 2011, 6 and 29, entitled a method for manufacturing large-size rare earth element doped optical fiber preform, which discloses a method for manufacturing a rare earth element doped optical fiber preform by using a liquid phase doping method, depositing a soot core layer by using a vapor phase axial deposition (VAD) technique, immersing the manufactured core soot powder in a mixed solution containing rare earth elements and co-dopant, and vitrifying in a high temperature furnace to obtain the core layer of the rare earth element optical fiber preform. And then, carrying out deposition of externally clad laminated powder outside the core layer of the rare earth element optical fiber preform and carrying out high-temperature vitrification to form a cladding layer, or sleeving the cladding layer outside the core layer of the rare earth doped optical fiber preform with a glass tube to form the large-core clad optical fiber preform. The method has the defects that the liquid phase doping is adopted to prepare the rare earth doped optical fiber preform, the distribution uniformity of rare earth ions in a core part is poor, and the purity of the prepared rare earth element solution is about 10 times lower than that of the rare earth chelate. The preform preparation process requires a long solution soak time of at least 12 hours to complete the doping process, and a dehydration process is necessary, which can lead to an increase in the loss of the subsequent fiber core if moisture remains.
Disclosure of Invention
Aiming at the technical problems of smaller core package and high processing difficulty of an optical fiber preform in the prior art for preparing the large-core-diameter rare-earth-doped optical fiber, the invention provides a preparation method of the large-core-package-ratio rare-earth-doped optical fiber preform, which comprises the steps of adopting improved chemical vapor deposition equipment to combine with a rare-earth chelate gas-phase heating system, firstly preparing a conventional core package-ratio rare-earth-doped optical fiber preform, and taking out a rare-earth-doped core part in the middle of the rare-earth-doped optical fiber preform. And (3) a new quartz reaction tube is connected into the MCVD deposition lathe, the core deposition of the preform is carried out according to the same method, the extracted rare earth doped small-diameter core rod is placed in the middle of the quartz reaction tube, and then the shrinkage is carried out, so that the large core cladding ratio rare earth doped optical fiber preform is formed. The preparation process of the large-core-diameter rare earth doped optical fiber solves the preparation problem of the large-core-diameter rare earth doped optical fiber from the preparation stage of the prefabricated rod, reduces the processing difficulty of the prefabricated rod, improves the doping uniformity of the rare earth doped core part and improves the production efficiency of the optical fiber.
The technical scheme adopted by the invention is as follows: the preparation process of RE doped optical fiber perform with great core cladding ratio includes the following steps:
step 1, cleaning a quartz reaction tube, accessing the quartz reaction tube into an MCVD deposition lathe, heating the rare earth chelate to a set temperature, simultaneously heating the quartz reaction tube by using oxyhydrogen flame, starting a core layer deposition procedure, and mixing the gaseous rare earth chelate with SiCl 4 、POCl 3 、AlCl 3 、He、O 2 Introducing reaction material gas into a quartz reaction tube together, setting the number of layers of a deposited core, carrying out core deposition of a preform, after the core deposition is finished, raising oxyhydrogen flame temperature to start a rod shrinking process, setting the pressure in the tube as a negative value when the inner diameter of the quartz reaction tube is reduced to 2mm-3mm, and shrinking the quartz reaction tube into a rare earth doped optical fiber preform;
step 3, performing high-temperature flame polishing treatment on the rare earth doped small-diameter core rod of the welding support rod by using oxyhydrogen flame, and healing tiny defects on the surface;
step 4, a new quartz reaction tube is connected into the MCVD deposition lathe again, and the rare earth chelate in the gas state is again connected with SiCl according to the method of step 1 4 、POCl 3 、AlCl 3 、He、O 2 Introducing reaction material gas into a quartz reaction tube together, setting the number of layers of a deposited core, carrying out core deposition of a prefabricated rod, after core deposition is finished, raising the oxyhydrogen flame temperature to start a rod shrinking process, reducing the oxyhydrogen flame temperature when the inner diameter of the quartz reaction tube is reduced and is larger than the diameter of a rare earth doped thin diameter core rod, moving an oxyhydrogen flame blast lamp to the right end of the quartz reaction tube, and placing the rare earth doped thin diameter core rod of the welding support rod processed in the step 3 from the left side of the quartz reaction tubeA supporting rod is fixed on a supporting pipe and a tail pipe on the MCVD lathe at the central position of the quartz reaction tube, and synchronous rotation is kept;
and step 5, raising the oxyhydrogen flame temperature again, setting the pressure in the quartz reaction tube to be negative, and shrinking the quartz reaction tube and the rare earth doped small-diameter core rod into a solid preform together, thereby preparing the rare earth doped optical fiber preform with large core-cladding ratio.
And (2) heating the rare earth chelate in the step (1) to a set temperature of 110-240 ℃.
And (3) setting the number of layers of the deposited core part to be 15-20 in the step (1), and forming the core-to-packet ratio to be 1:3.
And 2, the length of the rare earth doped small-diameter core rod is 360mm, and the rare earth doped small-diameter core rod is subjected to high-temperature polishing treatment.
And 2, drilling and integrally taking out the rare earth doped core part in the middle of the rare earth doped optical fiber perform, taking the center position of the rare earth doped core part in the middle of the rare earth doped optical fiber perform as the center of a circle, and taking out by adopting a drill bit with the same size as the diameter of the rare earth doped core part.
The number of deposited core layers is set to 20-30 layers as described in step 4.
And 4, reducing the inner diameter of the quartz reaction tube to be 2-3 mm larger than the diameter of the rare earth doped small-diameter core rod.
And 5, the core-cladding ratio of the rare earth doped optical fiber preform rod with the large core-cladding ratio is 21:25 or 10:11.
The invention has the beneficial effects that: according to the technical scheme, the MCVD improved vapor deposition equipment can be adopted to prepare the rare earth doped optical fiber preform by adopting a vapor phase doping method, the rare earth chelate with the purity of 99.999% is used as a raw material, the doping uniformity and purity of the rare earth doped core layer are improved, the introduction of moisture in the preparation process is avoided, the core loss of the subsequent optical fiber is reduced, the overall preparation time of the preform can be controlled within 6 hours, and the production efficiency is improved.
The prepared large core-cladding ratio rare earth doped optical fiber preform rod can reach 21:25 or 10:11. The method can effectively solve the problem that the prior improved chemical vapor deposition preparation process can not prepare the large core-to-cladding ratio optical fiber preform rod, and provides a solution for the development of the large core-to-cladding ratio rare earth doped optical fiber.
Drawings
FIG. 1 is a schematic view of a rare earth doped optical fiber preform according to the present invention;
FIG. 2 is a schematic view of a rare earth doped small diameter mandrel in accordance with the present invention;
FIG. 3 is a schematic diagram of the connection of a rare earth doped small diameter mandrel with a support rod in the present invention;
FIG. 4 is a schematic illustration of the rare earth doped fine diameter core rod of the present invention placed in a quartz reactor tube.
Detailed Description
In order to make the objects and technical solutions of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a preparation method of a large core-cladding ratio rare earth doped optical fiber preform, which comprises the following steps:
and step 1, cleaning a quartz reaction tube with the size of 25mm x 2mm x 600mm, accessing the quartz reaction tube into an MCVD deposition lathe, and operating a rare earth chelate gas-phase heating system to heat the rare earth chelate to the set temperature of 200 ℃. Heating quartz reaction tube to 2000 deg.C by oxyhydrogen flame, starting core layer deposition procedure, mixing rare earth chelate with SiCl in gas state 4 、POCl 3 、AlCl 3 、He、O 2 And (3) introducing the reaction material gas into a quartz reaction tube together, setting the deposition layer number to 15, and after core deposition is completed, increasing the oxyhydrogen flame temperature to about 2200 ℃ to start the rod shrinking process. When the inner diameter of the quartz reaction tube is about 2.5mm, the pressure in the tube is set to be negative, and the quartz reaction tube is contracted into a rare earth doped optical fiber preform 1, as shown in FIG. 1. Through the test of a PK2600 optical fiber preform refractive index analyzer, the core diameter is 4.5mm, the preform diameter is 13.8mm, and the core-cladding ratio is about 1:3.
and 2, placing the rare earth doped optical fiber preform 1 in a drilling lathe, selecting a hollow drill with the diameter of 4.5mm, taking the center position of the rare earth doped core part as the center of a circle, punching, and taking out the rare earth doped small-diameter core rod 2 with the length of 360mm, wherein the drawing is shown in fig. 2. Two ends of the rare earth doped small diameter core rod 2 are respectively welded with a quartz rod 3 with the diameter of 8mm as a supporting rod, as shown in figure 3.
And 3, performing high-temperature flame polishing treatment on the extracted rare earth doped small-diameter core rod 2 by using oxyhydrogen flame, and healing tiny defects on the surface.
Step 4, a new quartz reaction tube 4 with the size of 25mm x 2mm x 400mm is connected into an MCVD deposition lathe, and the rare earth chelate in the gas state is again connected with SiCl according to the method of the step 1 4 、POCl 3 、AlCl 3 、He、O 2 The reaction material gas was introduced into the quartz reaction tube together, and the number of deposition layers was set to 25. After the core deposition is completed, the oxyhydrogen flame temperature is raised to about 2200 ℃ to start the rod shrinking process. When the inner diameter of the quartz reaction tube is reduced to about 7mm and is 2.5mm larger than the diameter of the rare earth doped small diameter core rod 2, the oxyhydrogen flame temperature is reduced to 1300 ℃, the oxyhydrogen flame blowlamp is moved to the right end of the quartz reaction tube, the rare earth doped small diameter core rod of the welding support rod processed in the step 3 is placed into the quartz reaction tube from the left side of the quartz reaction tube, the rare earth doped small diameter core rod is adjusted to the central position of the quartz reaction tube, and the support rod 3 is fixed on a support tube 5 and a tail tube 6 on an MCVD lathe, as shown in fig. 4, and the synchronous rotation is kept.
And step 5, raising the oxyhydrogen flame temperature to 2200 ℃ again, setting the pressure in the quartz reaction tube to be negative, and shrinking the quartz reaction tube and the rare earth doped small-diameter core rod 2 together into a solid preform, thereby preparing the rare earth doped optical fiber preform with large core-cladding ratio. The core diameter is 11.35mm, the preform diameter is 14.59mm, and the core-cladding ratio is about 21:25, can meet the development of the rare earth doped active optical fiber with the size of 105/125 mu m.
Claims (8)
1. The preparation method of the rare earth doped optical fiber perform rod with large core cladding ratio is characterized by comprising the following steps:
step 1, cleaning a quartz reaction tube, accessing the quartz reaction tube into an MCVD deposition lathe, heating the rare earth chelate to a set temperature, simultaneously heating the quartz reaction tube by using oxyhydrogen flame, starting a core layer deposition procedure, and mixing the gaseous rare earth chelate with SiCl 4 、POCl 3 、AlCl 3 、He、O 2 Introducing reaction material gas into a quartz reaction tube together, setting the number of layers of a deposited core, carrying out core deposition of a preform, after the core deposition is finished, raising oxyhydrogen flame temperature to start a rod shrinking process, setting the pressure in the tube as a negative value when the inner diameter of the quartz reaction tube is reduced to 2mm-3mm, and shrinking the quartz reaction tube into a rare earth doped optical fiber preform;
step 2, placing the prepared rare earth doped optical fiber perform in a drilling lathe, drilling a rare earth doped core in the middle of the rare earth doped optical fiber perform, and integrally taking out to form a rare earth doped small-diameter core rod, and welding quartz rods with diameters larger than those of the rare earth doped small-diameter core rod at two ends respectively to serve as supporting rods;
step 3, performing high-temperature flame polishing treatment on the rare earth doped small-diameter core rod of the welding support rod by using oxyhydrogen flame, and healing tiny defects on the surface;
step 4, a new quartz reaction tube is connected into the MCVD deposition lathe again, and the rare earth chelate in the gas state is again connected with SiCl according to the method of step 1 4 、POCl 3 、AlCl 3 、He、O 2 Introducing reaction material gas into a quartz reaction tube together, setting the number of layers of a deposited core, carrying out core deposition of a prefabricated rod, after finishing core deposition, increasing oxyhydrogen flame temperature to start a rod shrinking process, reducing oxyhydrogen flame temperature when the inner diameter of the quartz reaction tube is reduced and is larger than the diameter of a rare earth doped small diameter core rod, moving an oxyhydrogen flame blast lamp to the right end of the quartz reaction tube, putting the rare earth doped small diameter core rod of the welding support rod processed in the step 3 into the central position of the quartz reaction tube from the left side of the quartz reaction tube, fixing the support rod on a support tube and a tail tube on an MCVD lathe, and keeping synchronous rotation;
and step 5, raising the oxyhydrogen flame temperature again, setting the pressure in the quartz reaction tube to be negative, and shrinking the quartz reaction tube and the rare earth doped small-diameter core rod into a solid preform together, thereby preparing the rare earth doped optical fiber preform with large core-cladding ratio.
2. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: and (2) heating the rare earth chelate in the step (1) to a set temperature of 110-240 ℃.
3. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: and (3) setting the number of layers of the deposited core part to be 15-20 in the step (1), and forming the core-to-packet ratio to be 1:3.
4. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: and 2, the length of the rare earth doped small-diameter core rod is 360mm, and the rare earth doped small-diameter core rod is subjected to high-temperature polishing treatment.
5. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: and 2, drilling and integrally taking out the rare earth doped core part in the middle of the rare earth doped optical fiber perform, taking the center position of the rare earth doped core part in the middle of the rare earth doped optical fiber perform as the center of a circle, and taking out by adopting a drill bit with the same size as the diameter of the rare earth doped core part.
6. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: the number of deposited core layers is set to 20-30 layers as described in step 4.
7. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: and 4, reducing the inner diameter of the quartz reaction tube to be 2-3 mm larger than the diameter of the rare earth doped small-diameter core rod.
8. The method for preparing the rare earth doped optical fiber preform with large core cladding ratio according to claim 1, wherein the method comprises the following steps: and 5, the core-cladding ratio of the rare earth doped optical fiber preform rod with the large core-cladding ratio is 21:25 or 10:11.
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