CN115215540A - Preparation method of multilayer fiber core doped optical fiber - Google Patents
Preparation method of multilayer fiber core doped optical fiber Download PDFInfo
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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
-
- 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
- C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- 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
- C03B37/01861—Means for changing or stabilising the diameter or form of tubes or rods
-
- 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
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
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- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The embodiment of the application belongs to the technical field of new material inorganic nonmetallic materials, and relates to a preparation method of a multilayer fiber core doped optical fiber. The technical scheme provided by the application comprises the following steps: polishing the inner wall and the outer wall of the base tube; depositing the base tube by using a high-temperature gas phase doping system to form a cladding layer and a plurality of core layers; and carrying out fusion shrinkage on the deposited base tube to form a prefabricated rod. The traditional liquid phase rare earth doping method is changed into a gas phase rare earth doping method, so that the refractive index of the fiber core area is uniformly distributed in the radial direction and the axial direction; the improvement is that a high-temperature gas phase doping method is directly used to successively form a plurality of fiber core layers, the fiber core layers are directly sintered to enable various rare earth elements in the fiber core area to be respectively positioned in different fiber core layers, and the refractive index distribution among the fiber core layers is adjusted by adjusting the content of the rare earth elements or elements such as silicon, germanium, fluorine, phosphorus and the like.
Description
Technical Field
The application relates to the technical field of new inorganic nonmetallic materials, in particular to a preparation method of a multilayer fiber core doped optical fiber.
Background
Fiber lasers typically consist of a pump source, a gain fiber, and a resonant cavity. The gain fiber is usually a rare earth doped glass fiber and is the core of a fiber laser; the pumping source provides energy to enable rare earth ions in the gain fiber to generate spontaneous radiation and stimulated radiation; the resonant cavity realizes the back-and-forth oscillation of signal light and finally realizes laser output.
Rare earth doped specialty fibers have found wide application in fiber lasers, amplifiers and sensors and have been greatly developed in recent years using Nd, er, ge, pr, ho, yb, tm, and the like as doping elements. Rare earth doped fibers are attractive for a variety of applications including fiber lasers, amplifiers, and sensors. The optical fiber has the characteristics of cylindrical waveguide structure, small core diameter, easy realization of high-density pumping, low lasing threshold, good heat dissipation performance, matching of the size of the core diameter with a communication optical fiber, high coupling capacity and efficiency, capability of forming integration of the transmission optical fiber and an active optical fiber, and being the basis for realizing all-optical communication.
As the energy of fiber lasers has gradually increased, the conventional methods and structures for manufacturing communication fibers have been unable to meet the requirements of high beam quality and high power fiber lasers for optical fibers. In order to realize laser output with high beam quality and possibly overcome the limitation of two factors, namely section laser damage and nonlinear effect, on power improvement, when an optical fiber is designed and selected, the Numerical Aperture (NA) of a doped fiber core is reduced as much as possible, and the diameter of the fiber core is correspondingly increased, so that the mode field diameter of a fundamental transverse mode LP01 is increased. This technique of achieving a large core diameter fiber by lowering the NA is known as the Large Mode Area Fiber (LMAF) technique.
The ytterbium-doped quartz fiber has the advantages of wide gain bandwidth, high quantum efficiency, no excited state absorption, no concentration quenching, tunable laser output wavelength of 1064-1150 nm and the like, so that the ytterbium-doped quartz fiber has very high laser output power and excellent conversion efficiency. Ytterbium-doped optical fibers in the current market are usually prepared by MCVD and solution doping methods, but the uniform distribution of the refractive index and the rare earth ions is difficult to obtain. From the earlier reported literature, ytterbium-doped fibers have a deep index dip or undulation in the center of the core (as shown in FIG. 1). This is due to material volatilization during sintering. The fluctuation of the refractive index of the core region also affects the mode stability of the large mode field laser, which is not favorable for obtaining stable laser output with diffraction limit.
The optical fiber prepared by MCVD and solution doping method commonly used in the market at present mainly has the following problems: 1. because of the liquid phase doping of the solution, the radial and axial distribution of rare earth ions is easy to be uneven, so that the performance consistency of the optical fiber is poor; 2. after the traditional liquid phase doping, in the process of MCVD sintering, materials are easy to volatilize, so that the refractive index distribution of a fiber core area is uncontrollable, and the refractive index distribution of the fiber core is easy to form central depression, as shown in figure 3.
Disclosure of Invention
The invention aims to provide a preparation method of a multilayer fiber core doped optical fiber, which solves the technical problem of poor performance consistency of the existing optical fiber.
In order to solve the above-mentioned problems, the embodiments of the present invention provide the following technical solutions:
a preparation method of a multilayer fiber core doped optical fiber comprises the following steps:
polishing the inner wall and the outer wall of the base tube;
depositing the base tube by using a high-temperature gas phase doping system to form a cladding layer and a plurality of fiber core layers;
and carrying out fusion shrinkage on the deposited base tube to form a prefabricated rod.
Further, the step of polishing the inner and outer walls of the substrate tube comprises:
SF6 and O2 are input into the base tube and move in cooperation with the heating source, and the inner wall and the outer wall of the base tube are polished at a first preset temperature and a first preset moving speed.
Further, the step of depositing the cladding layer and the core layer using a high temperature vapor phase doping system comprises:
taking oxygen as carrier gas to bring a first reaction raw material to be reacted into a base tube;
taking helium as a carrier gas to bring a second reaction raw material to be reacted in the ampere bottle of the high-temperature doping system into the base tube;
the heating source is with the second to predetermine the translation rate and heat the base tube outer wall and predetermine the temperature above the second, and the reaction raw materials in the indirect heating base tube generates the vitreous body, deposits at the inner wall of base tube.
Further, the step of depositing the cladding layer and the core layer using a high temperature vapor phase doping system further comprises:
the glass body which is not deposited is carried by the process gas, discharged through the soot collection pipe at the tail part and enters the soot collection box.
Further, the preparation method of the multilayer core doped optical fiber further comprises the following steps:
processing the optical fiber core in a layering way;
and adjusting the concentration of the rare earth element of the substrate fiber core layer close to the inner wall of the base tube so as to compensate the volatilized rare earth element ions in the melting and shrinking process of the preform.
Further, the preparation method of the multilayer core doped optical fiber further comprises the following steps:
the content of Ge2O3, fluoride or phosphorus oxide doped in each layer of the core is adjusted so as to adjust the refractive index distribution of each layer of the core.
Further, the first reaction raw material comprises SiCl4 and at least one of POCl3 and GeCl4, and the second reaction raw material comprises at least one of erbium chelate, ytterbium chelate, alCl3 and bismuth chelate.
Further, the step of collapsing the deposited substrate tube to form a preform comprises:
and carrying out forward sintering on the base tube for 3 times or more than 3 times at a third preset temperature and a third preset moving speed, wherein in the sintering process, the base tube is subjected to inward stress, downward gravity, outward pressure and unidirectional flame pressure.
Further, the first preset temperature is 1850 ℃ to 2200 ℃, and the first preset moving speed is 50mm/min to 150mm/min;
the second preset temperature is 1450-1800 ℃, and the second preset moving speed is 50-150 mm/min;
the third preset temperature is 2000-2300 ℃, and the third preset moving speed is 9-30 mm/min.
Further, before the step of polishing the inner wall and the outer wall of the base pipe, the method further comprises:
establishing a process flow menu, and setting the pressure flow of each gas, the temperature of a prefabricated plate, the moving speed of a machine tool, the moving speed of a heating source and the pressure of an adsorption tube;
the gas input end of the base tube is welded with the input tube, and the gas output end of the base tube is welded with the exhaust tube.
Compared with the prior art, the embodiment of the invention mainly has the following beneficial effects:
a method for preparing a multilayer fiber core doped optical fiber is characterized in that a high-temperature gas phase doping system is introduced by improving the manufacturing process flow of manufacturing a doped optical fiber preform rod by MCVD, and the traditional liquid phase rare earth doping method is changed into a gas phase rare earth doping method, so that the refractive index of a fiber core area is uniformly distributed in the radial direction and the axial direction; the method for manufacturing the fiber core is improved by directly using a high-temperature gas phase doping method to successively form a plurality of fiber core layers and directly sintering to enable various rare earth elements in the fiber core area to be respectively positioned in different fiber core layers and adjust the refractive index distribution among the fiber core layers by adjusting the content of the rare earth elements or elements such as silicon, germanium, fluorine, phosphorus and the like in each layer.
Drawings
In order to illustrate the solution of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are some embodiments of the invention, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a block flow diagram of a method for making a multi-layer core-doped optical fiber according to an embodiment of the present invention;
FIG. 2 is a block diagram of another process for fabricating a multi-layer core-doped optical fiber in accordance with an embodiment of the present invention;
FIG. 3 is a radial refractive index profile of an optical fiber prepared by a liquid phase rare earth doping method according to the prior art;
FIG. 4 is a schematic diagram of the high temperature vapor phase doping operation according to an embodiment of the present invention;
FIG. 5 is a graph of the radial refractive index profile of an optical fiber according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a prior art double-clad fiber structure;
FIG. 7 is a schematic diagram of a core structure of a multi-layer optical fiber according to an embodiment of the present invention.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "including" and "having," and any variations thereof in the description and claims of the invention and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of the present invention or in the foregoing drawings are used for distinguishing between different objects and not for describing a particular sequential order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the relevant drawings.
Examples
As shown in fig. 1, a method for preparing a multilayer core doped optical fiber includes the following steps:
s300, polishing the inner wall and the outer wall of the base tube;
s400, depositing the base tube by using a high-temperature gas phase doping system to form a cladding layer and a plurality of core layers;
s500, carrying out melt-shrinking on the deposited base tube to form a prefabricated rod.
According to the preparation method of the multilayer fiber core doped optical fiber provided by the embodiment of the invention, a high-temperature gas phase doping system is introduced by improving the manufacturing process flow of manufacturing a doped optical fiber preform by MCVD (modified chemical vapor deposition), and the traditional liquid phase rare earth doping method is changed into a gas phase rare earth doping method, so that the refractive index of a fiber core area is uniformly distributed in the radial direction and the axial direction; the method for manufacturing the fiber core is improved by directly using a high-temperature gas phase doping method to successively form a plurality of fiber core layers and directly sintering to enable various rare earth elements in the fiber core area to be respectively positioned in different fiber core layers and adjust the refractive index distribution among the fiber core layers by adjusting the content of the rare earth elements or elements such as silicon, germanium, fluorine, phosphorus and the like in each layer.
In one embodiment, the number of the multilayer core may be set to any natural number more than two according to requirements.
In one embodiment, the method for fabricating the multi-layer core-doped optical fiber is not limited to the optical fiber fabricated by high-temperature gas phase doping, but can also be the optical fiber fabricated by liquid phase doping.
In one embodiment, the doped fiber may be an ytterbium-doped fiber, an erbium-doped fiber or an ytterbium-erbium co-doped fiber.
In one embodiment, the method of making a multi-layer core-doped optical fiber further comprises:
processing the optical fiber core layer by layer;
and adjusting the concentration of the rare earth element of the substrate fiber core layer close to the inner wall of the base tube so as to compensate the volatilized rare earth element ions in the melting and shrinking process of the prefabricated rod.
Through the layered design, the concentration of single-layer doped rare earth element ions (such as ytterbium, erbium and the like) is adjusted, the volatilization of the rare earth element ions in the high-temperature fusion process of the optical fiber preform can be compensated, and the distribution of each rare earth ion of the final optical fiber is adjusted.
As shown in fig. 6, the active optical fiber is generally divided into a fiber core, an inner cladding, an outer cladding and a protective layer, the present invention uses a high temperature vapor phase doping system to improve the preparation process of the fiber core of the doped optical fiber, in this embodiment, as an example of the ytterbium-doped optical fiber, in order to solve the volatilization problem of ytterbium ions of the base fiber core layer close to the inner wall of the substrate tube during the high temperature collapsing process of the optical fiber preform, the ytterbium-doped optical fiber cores are layered, as shown in fig. 7, by moderately increasing the ytterbium concentration of the base fiber core layer close to the inner wall of the substrate tube, the volatilized ytterbium ions during the high temperature collapsing process of the preform are compensated. After a plurality of tests and adjustments, the problem of depressed index in the center of the fiber core of the ytterbium-doped fiber can be reduced or basically eliminated.
By dividing the fiber core into a plurality of layers, according to requirements, each layer of the fiber core can be doped with required rare earth elements (ytterbium, erbium, bismuth and the like), and then the refractive index distribution of the whole fiber core is adjusted by single-layer doping (phosphorus, germanium, fluorine and the like). The method makes the distribution of the rare earth ion concentration and the refractive index distribution of the fiber core accurately controllable.
In one embodiment, the method of making a multi-layer core-doped optical fiber further comprises:
the content of Ge2O3, fluoride or phosphorus oxide doped in each layer of the core is adjusted so as to adjust the refractive index distribution of each layer of the core.
By utilizing the method of designing and adjusting the fiber cores of the optical fibers in a layered manner, the ytterbium ion concentration in each layer of the fiber core can be freely designed, and then the refractive index distribution of each layer of the fiber core is adjusted by controlling the content of Ge2O3, fluoride or phosphorus oxide doped in each layer, so that the aims of meeting the refractive index and gain effect of the optical fibers can be fulfilled.
In one embodiment, each layer of the core may be doped with different rare earth elements, such as erbium, ytterbium, phosphorus, germanium, fluorine, etc., and the single layer of the core may be doped with any one or more rare earth elements.
In one embodiment, as shown in FIG. 2, the step of polishing the inner and outer walls of the substrate tube further comprises:
s100, establishing a process flow menu, and setting the pressure flow of each gas, the temperature of a precast slab, the moving speed of a machine tool, the moving speed of a heating source and the pressure of an adsorption tube;
s200, welding an input pipe at the gas input end of the base pipe, and welding an exhaust pipe at the gas output end of the base pipe.
The flow menu of the design process needs to set pressure flow of various gases such as oxygen, chlorine, helium, SF6 and the like, set temperature of a prefabricated plate, moving speed of a machine tool and a heating source, pressure of an adsorption tube and other parameters on software, and is used for establishing the flow menu.
The preparation of the preform reaction tube, the preform substrate tube (high quality) needs to be processed before proceeding, firstly a low quality input tube is welded at the gas input end of the substrate tube, and then a low quality exhaust tube is welded at the gas outlet end of the substrate tube.
The step of polishing the inner and outer walls of the base tube comprises:
SF6 and O2 are input into the base tube and move in cooperation with the heating source, and the inner wall and the outer wall of the base tube are polished at a first preset temperature and a first preset moving speed.
And (3) polishing and etching the reaction tube, inputting SF6 and O2 into the base tube, moving the base tube in a matching manner with a heating source, and polishing the inner wall and the outer wall of the base tube at a first preset temperature and a first preset moving speed to prepare for obtaining a high-quality prefabricated rod.
In one embodiment, the first predetermined temperature is 1850 ℃ to 2200 ℃ and the first predetermined moving speed is 50mm/min to 150mm/min.
The step of depositing the cladding layer and the core layer using a high temperature vapor phase doping system comprises:
taking oxygen as carrier gas to bring a first reaction raw material to be reacted into a base tube;
taking helium as a carrier gas to bring a second reaction raw material to be reacted in the ampere bottle of the high-temperature doping system into the base tube;
the heating source is with the second to predetermine the translation rate and heat the base tube outer wall and predetermine the temperature above the second, and the reaction raw materials in the indirect heating base tube generates the vitreous body, deposits at the inner wall of base tube.
The step of depositing the cladding layer and the core layer using a high temperature vapor phase doping system further comprises:
the glass body which is not deposited is carried by the process gas, discharged through the soot collection pipe at the tail part and enters the soot collection box.
In one embodiment, the first reaction raw material includes SiCl4 and at least one of POCl3 and GeCl4, and the second reaction raw material includes at least one of erbium chelate, ytterbium chelate, alCl3, and bismuth chelate.
In one embodiment, the second preset temperature is 1450 ℃ to 1800 ℃ and the second preset moving speed is 50mm/min to 150mm/min.
As shown in fig. 4, deposition of the cladding layer as well as the core layer. Deposition is the most complex ring of preform fabrication. SiCl4 and GeCl4 raw materials to be reacted are brought into a base tube from one end of the base tube by taking oxygen as carrier gas, erbium chelate, ytterbium chelate, alCl3 and the like to be reacted in an ampere bottle of a high-temperature doping system are brought into the base tube by taking helium as carrier gas, oxyhydrogen flame of an oxyhydrogen blast lamp is used for heating the outside of the base tube to more than 1600 ℃, the reaction raw materials in the base tube are indirectly heated, and a generated glass body is deposited on the inner wall of the base tube. The glass bodies which are not deposited are carried by the process gas and enter the soot collection box through a soot collection tube (commonly called a tail tube) with a larger diameter at the tail. This process step can be repeated as many times as is required by the design.
The step of collapsing the deposited base tube to form a preform comprises:
and carrying out forward sintering on the base pipe for 3 times or more than 3 times at a third preset temperature and a third preset moving speed, wherein in the sintering process, the base pipe is subjected to inward stress, downward gravity, outward pressure and unidirectional flame pressure.
In one embodiment, the third preset temperature is 2000 ℃ to 2300 ℃, and the third preset moving speed is 9mm/min to 30mm/min.
The purpose of collapsing is to sinter the deposited substrate tube into a preform. A typical sintering process requires 3 or more forward sinterings. In the sintering process, the preform is subjected to four forces, namely inward stress, downward gravity, outward pressure and unidirectional flame pressure, and when the optimal sintering temperature obtained through analysis and experiments is controlled to be 2000-2300 ℃, the optimal sintering speed is in the range of 9-30 mm/min.
The main chemical reactions involved in this aspect are as follows:
SiCl 4 +O 2 ＝SiO 2 +2Cl 2
GeCl 4 +O 2 ＝GeO 2 +2Cl 2
4AlCl 3 +3O 2 ＝2Al 2 O 3 +6Cl 2
4POCl 3 +3O 2 ＝2P 2 O 5 +6Cl 2
2C 33 H 63 ErO 6 +90O 2 ＝66CO 2 +63H 2 O+Er 2 O 3
2C 33 H 63 YbO 6 +90O 2 ＝66CO 2 +63H 2 O+Yb 2 O 3 。
the profile of the formulation for making a multilayer core optical fiber preform is shown in the following table:
as shown in fig. 5, the optical fiber was drawn from an optical fiber preform fabricated using an MCVD + NHS high temperature vapor phase doping system, and the results were measured using an optical fiber radial refractive index profile tester.
In comparison with the ytterbium-doped fiber prepared by conventional liquid phase doping as shown in fig. 3, it was found that the core center index depression of the ytterbium-doped fiber of the multilayer core prepared by the high temperature doping system was substantially disappeared.
According to the preparation method of the multilayer fiber core doped optical fiber provided by the embodiment of the invention, the manufacturing process flow of manufacturing a doped optical fiber preform by MCVD is improved, a high-temperature gas-phase doping system is introduced, and the traditional liquid-phase rare earth doping method is changed into the gas-phase rare earth doping method, so that the refractive index of the fiber core area is uniformly distributed in the radial direction and the axial direction; the method for manufacturing the fiber core is improved by directly using a high-temperature gas phase doping method to successively form a plurality of fiber core layers and directly sintering to enable various rare earth elements in the fiber core area to be respectively positioned in different fiber core layers and adjust the refractive index distribution among the fiber core layers by adjusting the content of the rare earth elements or elements such as silicon, germanium, fluorine, phosphorus and the like in each layer.
It is to be noted that in the description of the present invention, relational terms such as "first", "second", and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or without necessarily requiring or implying any relative importance or implicit to indicate or imply a number of technical features that are indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, as they may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically coupled, may be electrically coupled, or may be in communication with each other; may be directly connected or indirectly connected through intervening media, and may be in communicating relationship between the two elements unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various embodiments. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, embodiment aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. It should be noted that the specific features, structures, materials or characteristics described in the embodiments and examples of the present application may be combined with each other without conflict or contradiction. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the invention can be utilized independently or in combination with one or more other aspects and/or embodiments thereof by one of ordinary skill in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A preparation method of a multilayer fiber core doped optical fiber is characterized by comprising the following steps:
polishing the inner wall and the outer wall of the base tube;
depositing the base tube by using a high-temperature gas phase doping system to form a cladding layer and a plurality of fiber core layers;
and carrying out fusion shrinkage on the deposited base tube to form a prefabricated rod.
2. The method of claim 1, wherein the step of preparing a multi-layer core-doped optical fiber comprises,
the step of polishing the inner and outer walls of the base tube comprises:
SF6 and O2 are input into the base tube and move in cooperation with the heating source, and the inner wall and the outer wall of the base tube are polished at a first preset temperature and a first preset moving speed.
3. The method of manufacturing a multilayered core-doped optical fiber according to claim 2,
the step of depositing the cladding layer and the core layer using a high temperature vapor phase doping system comprises:
taking oxygen as carrier gas to bring a first reaction raw material to be reacted into a base tube;
taking helium as a carrier gas to bring a second reaction raw material to be reacted in the ampere bottle of the high-temperature doping system into the base tube;
the heating source is with the second to predetermine the translation rate and heat the base tube outer wall and predetermine the temperature above the second, and the reaction raw materials in the indirect heating base tube generates the vitreous body, deposits at the inner wall of base tube.
4. The method of claim 3, wherein the step of fabricating a multi-layer core-doped optical fiber comprises,
the step of depositing the cladding layer and the core layer using a high temperature vapor phase doping system further comprises:
the glass body which is not deposited is carried by the process gas, discharged through the dust collecting pipe at the tail part and enters the dust collecting box.
5. The method of claim 1, wherein the step of preparing a multi-layer core-doped optical fiber comprises,
the preparation method of the multilayer fiber core doped optical fiber further comprises the following steps:
processing the optical fiber core layer by layer;
and adjusting the concentration of the rare earth element of the substrate fiber core layer close to the inner wall of the base tube so as to compensate the volatilized rare earth element ions in the melting and shrinking process of the preform.
6. The method of claim 5, wherein the step of fabricating a multi-layer core-doped optical fiber comprises,
the preparation method of the multilayer fiber core doped optical fiber further comprises the following steps:
the content of Ge2O3, fluoride or phosphorus oxide doped in each layer of the core is adjusted so as to adjust the refractive index distribution of each layer of the core.
7. The method of claim 3, wherein the step of preparing a multi-layer core-doped optical fiber comprises,
the first reaction raw material comprises SiCl4 and at least one of POCl3 and GeCl4, and the second reaction raw material comprises at least one of erbium chelate, ytterbium chelate, alCl3 and bismuth chelate.
8. The method of claim 3, wherein the step of fabricating a multi-layer core-doped optical fiber comprises,
the step of collapsing the deposited base tube to form a preform comprises:
and carrying out forward sintering on the base pipe for 3 times or more than 3 times at a third preset temperature and a third preset moving speed, wherein in the sintering process, the base pipe is subjected to inward stress, downward gravity, outward pressure and unidirectional flame pressure.
9. The method of claim 8, wherein the step of preparing a multi-layer core-doped optical fiber comprises,
the first preset temperature is 1850-2200 ℃, and the first preset moving speed is 50-150 mm/min;
the second preset temperature is 1450-1800 ℃, and the second preset moving speed is 50-150 mm/min;
the third preset temperature is 2000-2300 ℃, and the third preset moving speed is 9-30 mm/min.
10. The method of claim 1, wherein the step of preparing a multi-layer core-doped optical fiber comprises,
before the step of polishing the inner wall and the outer wall of the base pipe, the method further comprises the following steps:
establishing a process flow menu, and setting the pressure flow of each gas, the temperature of the prefabricated plate, the moving speed of a machine tool, the moving speed of a heating source and the pressure of an adsorption pipe;
the gas input end of the base tube is welded with the input tube, and the gas output end of the base tube is welded with the exhaust tube.
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