CN116177868A - Preparation method of tapered optical fiber - Google Patents

Preparation method of tapered optical fiber Download PDF

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Publication number
CN116177868A
CN116177868A CN202310325117.6A CN202310325117A CN116177868A CN 116177868 A CN116177868 A CN 116177868A CN 202310325117 A CN202310325117 A CN 202310325117A CN 116177868 A CN116177868 A CN 116177868A
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China
Prior art keywords
optical fiber
tapered
quartz tube
conical
tapered optical
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Pending
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CN202310325117.6A
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Chinese (zh)
Inventor
周程丽
刘锐
王静
李超
王道龙
包箭华
叶锦程
李幸围
王颖
李念
何霖
倪志龙
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Wuhan Brightcore Optical Fiber Co ltd
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Wuhan Brightcore Optical Fiber Co ltd
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Priority to CN202310325117.6A priority Critical patent/CN116177868A/en
Publication of CN116177868A publication Critical patent/CN116177868A/en
Pending legal-status Critical Current

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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
    • C03B37/01884—Means for supporting, rotating and translating tubes or rods being formed, e.g. lathes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

The invention provides a preparation method of a tapered optical fiber, which comprises the following steps: manufacturing a first conical quartz tube with a first through hole therein; depositing a core layer in the first through hole of the first conical quartz tube; shrinking the first conical quartz tube deposited with the core layer to form a conical preform; the tapered preform is drawn into a tapered optical fiber that includes a core that conducts light along an axial direction of the tapered optical fiber and a cladding surrounding the core. According to the preparation method of the tapered optical fiber, repeated polishing and one-step forming are not needed in the whole process, the process is simple, the processing difficulty of the tapered optical fiber is greatly reduced, and the preparation efficiency and precision of the tapered optical fiber are improved.

Description

Preparation method of tapered optical fiber
Technical Field
The invention relates to the technical field of optical fiber preparation, in particular to a preparation method of a tapered optical fiber.
Background
Compared with the optical fiber with uniform ordinary fiber core cladding, the tapered optical fiber can improve the effective mode field area of the optical fiber by introducing the large fiber core diameter end, and has the advantage of effectively inhibiting nonlinear effect. Meanwhile, the tapered optical fiber also has excellent mode instability suppression performance, beam quality maintenance characteristics and Amplified Spontaneous Emission (ASE) suppression effect, and has great potential in the field of high-power lasers.
Tapered optical fibers are commonly used in applications such as optical coupling, optical sensing, nonlinear optics, micro-nano optics, fiber devices, and other research fields by axially varying the radius of the optical fiber using fusion tapering, mechanical polishing, chemical etching, or the like. However, in the existing tapered optical fiber processing process, the core rod and the glass rod are required to be respectively ground and processed, the preparation process is complex and complicated, particularly, the inner wall of the glass rod is ground, the processing difficulty is high, the precision is low, meanwhile, the length of the glass rod is limited by internal grinding, and the defects of poor adaptability and the like exist.
Disclosure of Invention
The invention provides a preparation method of a tapered optical fiber, which is used for solving the problems that in the processing process of the existing tapered optical fiber, a core rod and a glass rod are required to be respectively ground and processed, and the preparation process is complex and tedious.
The invention provides a preparation method of a tapered optical fiber, which comprises the following steps:
manufacturing a first conical quartz tube with a first through hole therein;
depositing a core layer in the first through hole of the first conical quartz tube;
shrinking the first conical quartz tube deposited with the core layer to form a conical preform;
the tapered preform is drawn into a tapered optical fiber that includes a core that conducts light along an axial direction of the tapered optical fiber and a cladding surrounding the core.
According to the preparation method of the tapered optical fiber provided by the invention, the step of manufacturing the first tapered quartz tube provided with the first through hole comprises the following steps:
and processing the outer wall of the first quartz tube into a cone shape, and preparing the first cone-shaped quartz tube with the first through hole inside.
According to the preparation method of the tapered optical fiber provided by the invention, the step of depositing the core layer in the first through hole of the first tapered quartz tube comprises the following steps:
pickling the first conical quartz tube;
uniformly depositing a loose layer in a first through hole of the first conical quartz tube, and doping rare earth ions in the loose layer.
According to the preparation method of the tapered optical fiber provided by the invention, the step of doping rare earth ions in the loose layer comprises the following steps:
introducing a solution containing the rare earth ions into the first through hole;
and after soaking for a preset time, discharging the residual solution containing the rare earth ions.
According to the preparation method of the tapered optical fiber provided by the invention, the step of shrinking the first tapered quartz tube deposited with the core layer to form the tapered preform comprises the following steps:
sintering the first conical quartz tube and the loose layer to enable the first conical quartz tube and the loose layer to be fused and contracted into the conical prefabricated rod.
According to the preparation method of the tapered optical fiber provided by the invention, the rare earth ion is Nd 3+ 、Yb 3+ 、Er 3+ 、Tm 3+ Any one or a combination of a plurality of the above.
According to the preparation method of the tapered optical fiber provided by the invention, the step of drawing the tapered preform into the tapered optical fiber comprises the following steps:
and placing the conical preform on a drawing tower, and drawing to obtain the conical optical fiber.
According to the preparation method of the tapered optical fiber provided by the invention, the step of drawing the tapered preform into the tapered optical fiber comprises the following steps:
machining the outer wall of the second quartz tube into a cone shape to construct a second cone-shaped quartz tube with a second through hole inside;
assembling a second conical quartz tube and a conical preform rod, and placing the assembled second conical quartz tube and the conical preform rod on a tube sleeving lathe to obtain a solid conical optical fiber preform rod;
according to the preparation method of the tapered optical fiber, the tapered optical fiber preform is placed on a drawing tower and drawn into the tapered optical fiber.
The step of placing the tapered optical fiber preform on a drawing tower and drawing the tapered optical fiber comprises the following steps:
and placing the tapered optical fiber preform on the drawing tower, and drawing the tapered optical fiber by adjusting drawing parameters.
According to the preparation method of the tapered optical fiber provided by the invention, the step of drawing the tapered preform into the tapered optical fiber further comprises the following steps:
the cladding is coated twice on its periphery to form an optical fiber coating.
According to the preparation method of the tapered optical fiber, the outer wall of the cylindrical quartz tube provided with the through hole is polished into the conical shape, the core layer is deposited in the first tapered quartz tube, the tapered preform is contracted into the tapered preform, and finally the tapered preform is drawn into the tapered optical fiber, so that the tapered optical fiber does not need to be polished for multiple times in the whole process, and the tapered optical fiber is formed in one step, so that the processing difficulty of the tapered optical fiber is greatly reduced, and the preparation efficiency and the precision of the tapered optical fiber are improved. And because the quartz tube is polished in the early stage, compared with the prior art of polishing in the later stage, the invention can reduce the cost and ensure the production efficiency.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for manufacturing a tapered optical fiber according to an embodiment of the present invention;
FIG. 2 is a schematic view of a first tapered quartz tube provided by an embodiment of the invention;
FIG. 3 is a schematic illustration of a first tapered quartz tube provided by an embodiment of the invention after deposition of a core layer;
FIG. 4 is a schematic view of a tapered preform provided by an embodiment of the present invention;
FIG. 5 is one of the schematic diagrams of a tapered optical fiber provided by an embodiment of the present invention;
FIG. 6 is a second flow chart of a method for fabricating a tapered optical fiber according to an embodiment of the present invention;
FIG. 7 is a third flow chart of a method for fabricating a tapered optical fiber according to an embodiment of the present invention;
FIG. 8 is a schematic view of a tapered optical fiber preform provided by an embodiment of the present invention;
FIG. 9 is a second schematic view of a tapered optical fiber provided by an embodiment of the present invention;
reference numerals:
1. a first conical quartz tube; 10. a first through hole; 2. a core layer; 3. a conical preform; 4. a tapered optical fiber; 41. a fiber core; 42. a cladding layer; 5. and a second quartz tube.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The method for preparing the tapered optical fiber provided by the invention is described below with reference to fig. 1, and comprises the following steps:
step S101: and manufacturing a first conical quartz tube with a first through hole.
Firstly, selecting a quartz tube with matched thermal properties and optical properties meeting requirements, and polishing the outer wall of the quartz tube to manufacture a first conical quartz tube 1 with a first through hole 10 as shown in fig. 2.
In the present embodiment, the first through hole 10 is provided in the center in the first tapered quartz tube 1, and the first through hole 10 extends from one end of the first tapered quartz tube 1 to the other end of the first tapered quartz tube 1.
Step S102: a core layer is deposited within the first through-hole of the first tapered quartz tube.
After the first tapered quartz tube 1 provided with the first through hole 10 therein is manufactured, in the process of controlling the rotation of the first tapered quartz tube 1, a gas raw material can be introduced through the first through hole 10 and deposited on the inner wall of the first through hole 10 to form the core layer 2, as shown in fig. 3.
Step S103: and (3) shrinking the first conical quartz tube deposited with the core layer to form a conical prefabricated rod.
After the core layer 2 is deposited in the first through hole 10 of the first tapered quartz tube 1, the first tapered quartz tube 1 on which the core layer 2 is deposited is contracted to form a tapered preform 3, as shown in fig. 4.
In the rod shrinking process, oxygen is introduced to purge the core layer 2 and the first conical quartz tube 1, and the temperature is gradually increased to 1700 ℃. Continuing to heat, reducing the moving speed of the heat source to 2.5-20 mm/min, keeping the pressure difference between the air outlet end and the atmospheric pressure, controlling the temperature to 1850-2150 ℃, and manufacturing the first conical quartz tube 1 for depositing the core layer 2 into the conical preform 3.
Step S104: the tapered preform is drawn into a tapered optical fiber.
After the tapered preform 3 is produced, the tapered preform 3 is placed on a drawing tower, and as shown in fig. 5, a tapered optical fiber 4 having a graded core-to-cladding ratio is drawn. The tapered optical fiber 4 includes a core 41 that guides light in the axial direction of the tapered optical fiber, and a cladding 42 surrounding the core 41.
The tapered optical fiber 4 with the gradually-changed core-to-core ratio has the unchanged diameter of the fiber core 41 and the gradually-changed cladding diameter, the core-to-core ratio of the optical fiber gradually changes along with the length of the optical fiber, the diameter of the fiber core 41, the core Bao Bi and the like can be regulated and controlled within a certain range according to the requirements, and the specific regulation can be carried out according to the requirements of passive optical fiber devices and optical systems.
According to the preparation method of the tapered optical fiber, the outer wall of the cylindrical quartz tube provided with the through hole is polished to be conical, the tapered preform is contracted after the core layer is deposited in the first tapered quartz tube, and finally the tapered preform is placed on the drawing tower to be drawn into the tapered optical fiber.
It should be noted that, during the process of depositing the core layer 2, the feeding speed of the gas or liquid raw material may be gradually adjusted to adjust the deposition amount of the core layer 2 along the direction of the first through hole 10, so that the deposition amount of the core layer 2 varies with the position of the first through hole 10, so as to uniformly or non-uniformly deposit the core layer 2 in the first through hole 10, as shown in fig. 3.
Alternatively, the gas or liquid raw material introducing speed may be continuously changed so that the core layer 2 gradually increases or decreases with the deposition amount of the first through hole 10; alternatively, the introduction speed of the gas or liquid raw material is changed stepwise so that the core layer 2 increases or decreases stepwise with the deposition amount of the first through hole 10.
Due to the gradual thickness change of the core layer 2, the core layer 2 with a conical shape or other shape is formed by melting during the rod shrinking process, namely, the tapered preform 3 is formed by melting, so that the fiber core 41 can form a tapered shape or a stepped shape after drawing.
In one embodiment, step S101: the step of manufacturing a first tapered quartz tube having a first through hole provided therein, as shown in fig. 6, includes the steps of:
step S1012: the outer wall of the first quartz tube is processed into a cone shape, and the first cone-shaped quartz tube with the first through hole inside is constructed.
Specifically, first quartz tube with thermal property matching and optical property meeting requirement is selected, as shown in fig. 2, the first quartz tube is generally a cylindrical quartz tube, in the actual production and processing process, the selected cylindrical quartz tube has the first through hole 10 meeting the specification, and then the outer wall of the first quartz tube is processed into a cone shape to construct a first cone-shaped quartz tube with the first through hole 10 inside.
Based on the above embodiment, in another embodiment, step S102: the step of depositing a core layer in the first through hole of the first tapered quartz tube, as shown in fig. 7, comprises the steps of:
step S1021: the first conical quartz tube was pickled.
Step S1022: uniformly depositing a loose layer in a first through hole of the first conical quartz tube, and doping rare earth ions in the loose layer.
Specifically, as shown in fig. 3, after the first tapered quartz tube with the first through hole 10 is manufactured, the first tapered quartz tube is cleaned by an acid cleaning method, for example, a hydrofluoric acid solution can be used for acid cleaning of the whole first tapered quartz tube, so that the introduction of impurities is effectively reduced by acid cleaning, and the processing quality is ensured.
After the pickling is finished, the air inlet section of the first conical quartz tube is provided with a rotary joint, the first conical quartz tube is arranged on a deposition lathe, a loose layer can be deposited by adopting a modified chemical vapor deposition method (Modified Chemical Vapor Deposition, MCVD), and rare earth ions are doped in the loose layer.
Specifically, the first conical quartz tube was externally preheated with oxyhydrogen flame, and during the preheating, the temperature of the first conical quartz tube was gradually increased to 1200 ℃. Then, the gas raw material is introduced into the first conical quartz tube according to a preset flow. The gas raw material is SiCl 4 、BCl 3 、GeCl 4 、POCl 3 Any one or a combination of a plurality of them. Before that, SF is also introduced into the first conical quartz tube 6 ，O 2 And etching the inner side wall of the first conical quartz tube for a plurality of times, continuously heating the first conical quartz tube and introducing gas raw materials. Wherein, when the gas raw material is introduced, the temperature of the reaction tube needs to be heated to 1500-1800 ℃. The first conical quartz tube is in reverse directionIn the process of the double rotation, loose layers with specified thickness are deposited on the inner side walls of the double rotation. Rare earth ions can be doped in the loose layer during the deposition process or after the deposition.
It should be noted that, according to practical needs, the loose layer may be deposited by an external vapor deposition method (Outside Vapour Deposition, OVD), an axial chemical vapor deposition method (Vapour phase Axial Deposition, VAD) or a plasma chemical vapor deposition method (Plasma Chemical Vapor Deposition, PCVD), and rare earth ions may be doped in the loose layer.
In this embodiment, during the process of doping rare earth ions, the solution containing rare earth ions may be introduced into the first through hole, and after the solution is soaked for a preset time, the remaining solution containing rare earth ions is discharged, so that the loose layer containing rare earth ions may be obtained.
Specifically, a solution containing rare earth doped ions is introduced into a first conical quartz tube, and is soaked for more than 30 minutes for preset time, so that rare earth ion doping is carried out on the loose layer. Specifically, rare earth doped ions and a dissolving solution are mixed according to a preset proportion to obtain a rare earth doped ion solution, wherein the rare earth ions are Nd 3+ 、Yb 3+ 、Er 3+ 、Tm 3+ Any one or a combination of a plurality of the above. The dissolution liquid is chloride solution or nitrate solution. After preparing the solution containing rare earth doped ions, taking out the first conical quartz tube, putting the first conical quartz tube into the solution containing rare earth doped ions with the specified concentration for soaking, discharging the solution containing rare earth ions after the soaking is finished, and drying to obtain a loose layer containing rare earth ions in the first through hole. Furthermore, rare earth ions are not required to be doped if a passive tapered fiber is produced.
Based on the above embodiments, in some embodiments, step S103: shrinking the first conical quartz tube deposited with the core layer to form a conical prefabricated rod, wherein the step comprises the following steps of: sintering the first conical quartz tube and the loose layer to enable the first conical quartz tube and the loose layer to be fused and contracted into a conical prefabricated rod.
After the core layer is deposited, the first conical quartz tube and the loose layer are sintered at high temperature to vitrify the loose layer containing rare earth ions, and then the vitrified loose layer and the first conical quartz tube are fused and contracted into a solid conical preform 3, so that gaps between the loose layer and the first conical quartz tube are effectively removed through rod contraction.
Based on the above embodiments, in some embodiments, step S104: the step of drawing the tapered preform into a tapered optical fiber specifically comprises: after the tapered preform is manufactured, as shown in fig. 4, the tapered preform 3 may be placed on a drawing tower, and the tapered preform 3 is softened by heating using a resistance wire furnace, and adjustable experimental parameters include a heating rate, a drawing temperature, a drawing tension, and the like. And drawing the softened conical preform rod in a resistance wire furnace to obtain the conical optical fiber. As shown in fig. 5, the tapered optical fiber 4 includes a core 41 that guides light in the tapered optical fiber axial direction, and a cladding 42 surrounding the core 41. The tapered optical fiber 4 with the gradually-changed core-to-core ratio has the unchanged diameter of the fiber core 41 and the gradually-changed cladding diameter, the core-to-core ratio of the optical fiber gradually changes along with the length of the optical fiber, the diameter of the fiber core 41, the core Bao Bi and the like can be regulated and controlled within a certain range according to the requirements, and the specific regulation can be carried out according to the requirements of passive optical fiber devices and optical systems.
Based on the above embodiment, in other embodiments, step S104: the step of drawing the tapered preform into a tapered optical fiber specifically comprises: after the conical preform is manufactured, if the conical preform is found not to meet the specification and needs a sleeve, as shown in fig. 8, a second quartz tube 5 with thermal property matching and optical property meeting requirements is selected, the second quartz tube is generally a cylindrical quartz tube provided with a through hole, in the actual manufacturing process, the selected cylindrical quartz tube is provided with the second through hole meeting the specification, a second through hole matched with the conical preform 3 is formed in the second quartz tube 5, and the second through hole extends from one end of the second quartz tube 5 to the other end of the second quartz tube. And then assembling the second conical quartz tube and the conical preform rod, and placing the assembled second conical quartz tube and the conical preform rod on a tube sleeving lathe, and obtaining the solid conical optical fiber preform rod after fusion shrinkage. And placing the tapered optical fiber preform on a wire drawing tower, and heating and softening the tapered optical fiber preform by using a resistance wire furnace, wherein adjustable experimental parameters comprise heating rate, drawing temperature, drawing tension and the like. In the resistance wire furnace, the softened conical optical fiber preform is drawn, so that the conical optical fiber can be drawn, the sealing performance can be fully ensured through drawing after the sleeve, the drawing is easier to control, and the concentricity error is restrained. As shown in fig. 5, the tapered optical fiber 4 includes a core 41 that guides light in the tapered optical fiber axial direction, and a cladding 42 surrounding the core 41. The tapered optical fiber 4 with the gradually-changed core-to-core ratio has the unchanged diameter of the fiber core 41 and the gradually-changed cladding diameter, the core-to-core ratio of the optical fiber gradually changes along with the length of the optical fiber, the diameter of the fiber core 41, the core Bao Bi and the like can be regulated and controlled within a certain range according to the requirements, and the specific regulation can be carried out according to the requirements of passive optical fiber devices and optical systems.
Finally, as shown in FIG. 9, the outer periphery of the cladding 42 may be coated twice with a low-profile coating to form an optical fiber coating within the cladding 42.
Specifically, the first coating is performed to form an optical fiber inner coating; a second coating is applied to the peripheral wall of the inner coating of the optical fiber to form an outer coating.
In the above-described manufacturing process, the present embodiment is essentially to apply the optical fiber inner coating layer to the peripheral wall of the optical fiber cladding layer. The optical fiber inner coating is a low refractive index coating, and the refractive index of the optical fiber inner coating is lower than that of the optical fiber cladding so as to ensure the reliability of the tapered optical fiber.
In addition, the present application also provides two specific embodiments.
Example 1:
the preparation method of the double-clad ytterbium-doped tapered optical fiber comprises the following steps:
step 1: and polishing the outer wall of the cylindrical high-purity quartz tube into a cone shape.
Step 2: the first conical quartz tube was placed on a lathe to deposit the core layer uniformly.
Step 3: and placing the deposited core rod on a lathe to shrink the rod into a conical prefabricated rod.
Step 4: and (3) placing the conical preform on a drawing tower to draw into a conical optical fiber, and setting different drawing parameters to realize that the cladding diameter range of the double-cladding ytterbium-doped conical optical fiber is 400-600 mu m and the core diameter is 20 mu m.
Example 2:
the preparation method of the double-clad ytterbium-doped tapered optical fiber comprises the following steps:
step 1: and polishing the outer wall of the cylindrical high-purity quartz tube into a cone shape.
Step 2: the first conical quartz tube was placed on a lathe to deposit the core layer uniformly.
Step 3: and placing the deposited core rod on a lathe to shrink the rod into a conical prefabricated rod.
Step 4: and (3) placing the conical preform on a drawing tower to draw into a conical optical fiber, and setting different drawing parameters to realize that the cladding diameter of the double-cladding ytterbium-doped conical optical fiber is 400 mu m and the core diameter range is 30 mu m-35 mu m.
The above-described embodiment of the apparatus is merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method of making a tapered optical fiber comprising:
manufacturing a first conical quartz tube with a first through hole therein;
depositing a core layer in the first through hole of the first conical quartz tube;
shrinking the first conical quartz tube deposited with the core layer to form a conical preform;
the tapered preform is drawn into a tapered optical fiber that includes a core that conducts light along an axial direction of the tapered optical fiber and a cladding surrounding the core.
2. The method of manufacturing a tapered optical fiber according to claim 1, wherein the step of manufacturing a first tapered quartz tube having a first through hole therein comprises:
and processing the outer wall of the first quartz tube into a cone shape, and preparing the first cone-shaped quartz tube with the first through hole inside.
3. The method of preparing a tapered optical fiber as claimed in claim 2, wherein the step of depositing a core layer within the first through hole of the first tapered quartz tube comprises:
pickling the first conical quartz tube;
uniformly depositing a loose layer in a first through hole of the first conical quartz tube, and doping rare earth ions in the loose layer.
4. A method of preparing a tapered optical fiber according to claim 3, wherein the step of doping the bulk layer with rare earth ions comprises:
introducing a solution containing the rare earth ions into the first through hole;
and after soaking for a preset time, discharging the residual solution containing the rare earth ions.
5. The method of manufacturing a tapered optical fiber according to claim 3, wherein the step of collapsing the first tapered quartz tube on which the core layer is deposited to form a tapered preform comprises:
sintering the first conical quartz tube and the loose layer to enable the first conical quartz tube and the loose layer to be fused and contracted into the conical prefabricated rod.
6. According to claim 3The preparation method of the tapered optical fiber is characterized in that the rare earth ion is Nd 3+ 、Yb 3+ 、Er 3+ 、Tm 3+ Any one or a combination of a plurality of the above.
7. The method of preparing a tapered optical fiber as claimed in claim 5, wherein the step of drawing the tapered preform into a tapered optical fiber comprises:
and placing the conical preform on a drawing tower, and drawing to obtain the conical optical fiber.
8. The method of preparing a tapered optical fiber as claimed in claim 5, wherein the step of drawing the tapered preform into a tapered optical fiber comprises:
machining the outer wall of the second quartz tube into a cone shape to construct a second cone-shaped quartz tube with a second through hole inside;
assembling a second conical quartz tube and a conical preform rod, and placing the assembled second conical quartz tube and the conical preform rod on a tube sleeving lathe to obtain a solid conical optical fiber preform rod;
and placing the tapered optical fiber preform on a drawing tower, and drawing to obtain the tapered optical fiber.
9. The method of manufacturing a tapered optical fiber according to claim 8, wherein the step of placing the tapered optical fiber preform on a drawing tower and drawing the tapered optical fiber comprises:
and placing the tapered optical fiber preform on the drawing tower, and drawing the tapered optical fiber by adjusting drawing parameters.
10. The method of preparing a tapered optical fiber according to any one of claims 1-9, wherein the step of drawing the tapered preform into a tapered optical fiber further comprises:
the cladding is coated twice on its periphery to form an optical fiber coating.
CN202310325117.6A 2023-03-29 2023-03-29 Preparation method of tapered optical fiber Pending CN116177868A (en)

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