CN102253445B - Single crystal fiber with Bragg structure cladding and manufacturing method thereof - Google Patents

Single crystal fiber with Bragg structure cladding and manufacturing method thereof Download PDF

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CN102253445B
CN102253445B CN 201110196811 CN201110196811A CN102253445B CN 102253445 B CN102253445 B CN 102253445B CN 201110196811 CN201110196811 CN 201110196811 CN 201110196811 A CN201110196811 A CN 201110196811A CN 102253445 B CN102253445 B CN 102253445B
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covering
single crystal
monocrystalline
crystal fiber
fibre core
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CN102253445A (en
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娄淑琴
鹿文亮
王立文
陈卫国
邹辉
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Beijing Jiaotong University
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Abstract

The invention discloses a single crystal fiber with Bragg structure cladding and a manufacturing method thereof and in particular relates to a design of a cladding structure of a single crystal optical fiber, belonging to the field of specific fibers. The invention discloses a single crystal fiber with a phase step refraction index cladding and a manufacturing method thereof. The single crystal fiber comprises a single crystal fiber core (1) and a Bragg structure cladding which surrounds the single fiber core and is formed by radially and alternately distributing a material layer (2) and a material layer (3) of two different refraction indexes, wherein each material layer comprises 10 to 20 layers. The fiber manufacturing method is characterized in that the materials of two different refraction indexes are alternately deposited to form a structure the high-refraction-index layers and the low-refraction-index layers of which are distributed radially and alternately by using an MCVD (modified chemical vapor deposition) method. The alternately distributed structure is reduced through heating and stretching so as to wrap the single crystal core finally so that the Bragg structure cladding is formed. The single crystal fiber is provided with the phase step refraction index cladding, and has high light binding capacity and low consumption. By using the manufacturing method of single crystal fibers, phase step refraction index claddings can be manufactured for single fibers of different materials, and the application of the single crystal fibers of various different materials is expanded.

Description

A kind of have bragg structure covering single crystal fiber and a preparation method
Technical field
The invention belongs to the special optical fiber field, the particularly cladding structure of single crystal fiber design.
Background technology
Single crystal fiber is mainly formed by crystalline material wire drawing growth at present, has the dual nature of crystal and fiber.Single crystal fiber has high strength, characteristics such as high temperature resistant, can be applicable to wide spectrums such as conduction, sensing, frequency multiplication and holographic data storage.Because crystal refractive index is higher, single crystal fiber is difficult to make fibre core-cladding structure, and existing single crystal fiber is generally no cladding structure.The single crystal fiber loss of no cladding structure is big, and characteristic is subject to the environmental change influence, and the integrality of optical fiber surface also is vulnerable to destroy.
For the cladding structure of single crystal fiber, some research and design are arranged also.Mainly be to utilize mg-doped lithium niobate (MgO:LiNbO 3) the pure lithium columbate crystal (LiNbO of refractive index ratio 3) principle that refractive index is low, use MgO or the MgF mode through diffusion with magnesium ion by the diffusion of outer course center, thereby reduce the refractive index of outer lithium columbate crystal, form covering.Nineteen ninety-five, Shanghai Communications University, Xi'an omissions or missing parts repair etc. the people nineteen ninety-five " XI AN JIAOTONG UNIVERSITY Subject Index " 29 volumes the 9th interim the announcement utilize the method to make lithium niobate material monocrystalline fibre cladding.This method is only applicable to lithium niobate (LiNbO 3) single crystal fiber of crystal growth, to other crystalline material and inapplicable, limited the scope that covering is used.In addition, this method poor controllability, diffusion is inhomogeneous, and diffusion depth should not be controlled, the properties of product less stable.
Summary of the invention
The technical matters that the present invention solved is to propose a kind of bragg structure covering single crystal fiber that has, and this optical fiber has the step-refraction index covering, and has introduced the preparation method of this single crystal fiber.
The present invention solves the technical scheme of its technical matters:
A kind of have a bragg structure covering single crystal fiber, and this single crystal fiber comprises the monocrystalline fibre core and is centered around around the monocrystalline fibre core, the bragg structure covering that the material layer of two kinds of different refractivities radially alternately distributes and constitutes, each 10～20 layers of two kinds of material layers.
Every layer cross section of described bragg structure covering is an annular, perhaps is oval ring; Every layer thickness equates, is d, satisfies following relation with the operation wavelength λ of single crystal fiber:
λ＝4·d·n eff
Wherein, n EffBe the corresponding effective refractive index of single crystal fiber operation wavelength λ.
Described monocrystalline fibre core is the lithium columbate crystal fibre core, or halogenide monocrystalline fibre core, or the sapphire single-crystal fibre core, and the diameter of monocrystalline fibre core is 10～300 μ m.
Two kinds of material layers that described refractive index is different are divided into high-index material layer and low refractive index material layer; The material of high-index material layer is to mix germanite English, or tygon, and the material of low refractive index material layer is a fluorine-doped quartz; Or pure quartz, or teflon.
A kind of preparation method with bragg structure covering single crystal fiber, manufacturing process may further comprise the steps:
Step 1 is made the monocrystalline fibre core, and its core diameter is 10～300 μ m;
Step 2 is chosen a quartzy parent tube, uses the MCVD method, two kinds of materials that layering alternating deposit refractive index is different, and each deposit thickness equates that each deposits 10～20 layers, processes the covering prefabricated component with bragg structure;
The covering prefabricated component that step 3 is made with heating arrangement heating steps two with bragg structure, and its center bore is pulled to is 100～500 μ m;
Step 4 intercepting one segment length is in the covering prefabricated component with bragg structure of monocrystalline fibre core; In the center pit of the covering that the monocrystalline fibre core inserting step three that step 1 is made is made; Make the end alignment of an end and the covering of monocrystalline fibre core; And sintering is together, and the other end of covering is connected with air extractor, the vacuum tightness of bleeding is-2000～-3000pa;
Step 5 keep internal vacuum-2000～-the 3000pa condition under; Use heating arrangement to begin heating from an end of sintering, and the stretching covering, under the effect of stretching and negative pressure; Covering tightly wraps the monocrystalline fibre core; To the slow mobile heating device of the other end, tightly wrapped by covering until whole monocrystalline fibre cores, just processed bragg structure covering single crystal fiber after the cooling;
The optical fiber that step 6 is processed step 5 with coating machine applies, and strengthens the toughness of optical fiber.
The thickness of the sedimentary deposit of MCVD method in the described step 2 need be according to the internal diameter of single crystal fiber operation wavelength λ and the quartzy parent tube of choosing through calculating.After the covering prefabricated component formed the bragg structure covering through twice heat drawing, the sedimentary deposit that uses MCVD method deposition dwindled and becomes the different refractivity material layer along with the heat drawing geometric ratio, and the thickness d of every layer of material satisfies:
λ＝4·d·n eff
Wherein, n EffBe the corresponding effective refractive index of single crystal fiber operation wavelength.
A kind of preparation method with bragg structure covering single crystal fiber, manufacturing process may further comprise the steps:
Step 1 is made the monocrystalline fibre core, and its core diameter is 10～300 μ m;
Step 2 is chosen teflon and the tygon sleeve pipe that wall thickness is identical, diameter is different; Teflon and tygon sleeve pipe replace socket, and the number of plies is 20～40 layers, promptly process the covering prefabricated component with bragg structure;
Step 3 intercepting one segment length is in the covering prefabricated component that the monocrystalline fibre core has bragg structure, and the monocrystalline fibre core of packing at one end aligns the two; The sintering sealing is installed air extractor at the other end, is bled between monocrystalline fibre core and the sleeve pipe and the gap between sleeve pipe and the sleeve pipe; And keep vacuum tightness and be-1000～-1500pa; Begin heating from the sintering end, and stretching covering prefabricated component, make each tube together; And tightly wrap the monocrystalline fibre core, promptly processed and had bragg structure covering single crystal fiber;
The bragg structure covering single crystal fiber that has that step 4 is made step 3 with coating machine applies, and strengthens the toughness of optical fiber.
The present invention compares the beneficial effect that is had with prior art:
The present invention introduces the bragg structure cladding structure, in single crystal fiber, realizes the index distribution that step changes, and the ability of restriction light is strong, and the energy loss that light transmits in single crystal fiber is little.
Than the magnesium ion osmosis of present use, the present invention is applicable to the single crystal fiber of different materials, can add covering to the single crystal fiber of material different, has expanded the application of various different materials single crystal fibers, applied range.And the present invention adds covering on the monocrystalline fibre core, does not have iontophoretic injection method iontophoretic injection inhomogeneous, and the unmanageable difficult problem of the optic fibre characteristic that the problem of the bad grasp of time of penetration is brought is controlled optic fibre characteristic more easily.
As long as known single crystal fiber operation wavelength, the bragg structure covering according to preparation of the structural parameters that calculate and monocrystalline plug are complementary get final product through assembling processing again, Production Time weak point, yield rate is higher.In this kind method, enchancement factor is less, and optical fiber property of producing and theory expectation gap are little.
Description of drawings
Fig. 1 for material layer each ten layers have a bragg structure covering single crystal fiber schematic cross-section;
Fig. 2 for material layer each 20 layers have a bragg structure covering single crystal fiber schematic cross-section;
Fig. 3 for each covering cross section of ten layers of material layer be oval ring have a bragg structure covering single crystal fiber schematic cross-section;
Fig. 4 is for realizing the artwork of oval ring covering.
Embodiment
With the accompanying drawing is that embodiment is described further the present invention.
Embodiment one
A kind of operation wavelength is the single crystal fiber with bragg structure covering of 1550nm; As shown in Figure 1; This single crystal fiber comprises monocrystalline fibre core 1 and is centered around around the monocrystalline fibre core bragg structure covering that the material layer of two kinds of different refractivities radially alternately distributes and constitutes.Each 10 layers of two kinds of material layers, and every layer thickness is 0.176 μ m.External diameter with bragg structure covering single crystal fiber is 200 μ m.
Monocrystalline fibre core 1 adopts lithium columbate crystal material fibre core, and its diameter is 10 μ m; Two kinds of different refractivity material layers are to be respectively by refractive index to be the low refractive index material layer 2 that constitutes of 1.41 fluorine-doped quartz material and to be 1.5 the high-index material layer 3 that germanite English material constitutes of mixing by refractive index.
Embodiment two
A kind of operation wavelength is the single crystal fiber with bragg structure covering of 4 μ m; As shown in Figure 2; This single crystal fiber comprises monocrystalline fibre core 1 and is centered around around the monocrystalline fibre core bragg structure covering that the material layer of two kinds of different refractivities radially alternately distributes and constitutes.Each 20 layers of two kinds of material layers, and every layer thickness is all identical, is 0.588 μ m.External diameter with bragg structure covering single crystal fiber is 250 μ m.
Monocrystalline fibre core 1 adopts sapphire crystal material fibre core, and its diameter is 100 μ m; Two kinds of different refractivity material layers are to be respectively by refractive index to be the low refractive index material layer 2 that constitutes of 1.44 pure quartz material and to be 1.5 the high-index material layer 3 that germanite English material constitutes of mixing by refractive index.
Embodiment three
A kind of operation wavelength is the single crystal fiber with bragg structure covering of 10.6 μ m; As shown in Figure 1; This single crystal fiber comprises monocrystalline fibre core 1 and is centered around around the monocrystalline fibre core bragg structure covering that the material layer of two kinds of different refractivities radially alternately distributes and constitutes.Each 10 layers of two kinds of material layers, and every layer thickness is all identical, is 1.2 μ m.External diameter with bragg structure covering single crystal fiber is 500 μ m.
Monocrystalline fibre core 1 adopts silver bromide (AgBr) crystalline material fibre core, and its diameter is 300 μ m; Two kinds of different refractivity material layers are to be respectively by refractive index to be the low refractive index material layer 2 that constitutes of 1.35 polytetrafluoroethylmaterial material and to be the high-index material layer 3 that 1.557 polythene material constitutes by refractive index.
Embodiment four
Make operation wavelength and be the preparation method with bragg structure covering single crystal fiber of 1550nm, as shown in Figure 1, this manufacturing process may further comprise the steps:
Step 1 uses crystal growth to make lithium columbate crystal fibre core 1, and its diameter is 10 μ m, the length 150mm of monocrystalline fibre core 1;
Step 2 is chosen a quartzy parent tube, and the silica based bore is 10mm.Material with two kinds of different refractivities of MCVD method layering alternating deposit.In these two kinds of materials, high-index material be refractive index be 1.512 mix germanite English material, low-index material is that refractive index is 1.368 fluorine-doped quartz material.Each deposit thickness is 176 μ m, mixes each 10 layers of germanite English material layer and fluorine-doped quartz material layers, processes the covering prefabricated component with bragg structure.
The covering prefabricated component with bragg structure that step 3 uses fiber drawing tower that step 2 is made draws, and shortens preparatory covering product center bore into 100 μ m;
The covering 200mm that step 4 intercepting step 3 draws, the monocrystalline fibre core 1 that step 1 is made inserts in its center pit, makes the end alignment of an end and the covering of monocrystalline fibre core 1, uses the oxyhydrogen flame sintering together; The other end at covering is connected with air extractor, and the vacuum tightness of bleeding is-2000pa;
Step 5 is being kept under the condition of vacuum tightness for-2000pa, and an end of sintering is fixed on the support, and the other end is connected with drawing machine; Use oxyhydrogen flame to begin heating from an end of sintering, and with the drawing machine covering that stretches.During heating, covering is softening, and under the effect of stretching and negative pressure, covering tightly wraps monocrystalline fibre core 1.Slowly move oxyhydrogen flame to the other end, whole coverings are tightened to becoming one with monocrystalline fibre core 1, just process Prague cladding structure single crystal fiber after the cooling.The fluorine-doped quartz material layer that deposits in the step 2 with mix germanite English material layer and become low refractive index material layer 2 and high-index material layer 3 in the covering through twice drawing by high temperature.
The optical fiber that step 6 is processed step 5 with coating machine applies, and increases the intensity of single crystal fiber.
The thickness of the sedimentary deposit of MCVD method in the described step 2 need calculate according to the internal diameter of single crystal fiber operation wavelength λ and selected quartzy parent tube, and specific algorithm is following:
At first, calculate the thickness d of mixing germanite English material layer 3 and fluorine-doped quartz material layer in the object construction according to the Bragg grating formula.The Bragg grating formula is λ=4dn EffWherein, n EffFor wavelength is the effective refractive index of light in lithium columbate crystal of 1550nm, value is 2.2 usually.Can calculate, in object construction, the equal d of thickness that mixes germanite English material layer 3 and fluorine-doped quartz material layer 2 is 0.176 μ m.
Then, according to the principle of fiber draw process glass-based bore and sedimentary deposit scaled down, calculate the thickness D of each sedimentary deposit.The glass-based bore of choosing in this example is 10mm, has 20 layers of sedimentary deposit, and gross thickness is 20D, and then deposition back glass tube inner wall thickness is 10-20D.When the inwall of post-depositional glass tube through after twice heat drawing, when narrowing down to the internal diameter 10 μ m of monocrystalline fibre core 1, deposit thickness D geometric ratio narrows down to different refractivity material layer d.It is following to satisfy equation:
Figure BDA0000075753130000071
Solve an equation: D=0.130 μ m.To get thickness be 0.130 μ m to sedimentary deposit in the step 2.
Choose the glass parent tube of different size, make the sedimentary deposit of varying number, different materials, all can obtain the deposit thickness that deposits in the step 2 MCVD method with the method that above-mentioned this geometric ratio is dwindled.
Embodiment five
Make operation wavelength and be the preparation method with bragg structure covering single crystal fiber of 4 μ m, as shown in Figure 2, this manufacturing process may further comprise the steps:
Step 1 uses crystal growth to make sapphire crystal fibre core 1, and its diameter is 100 μ m, the length 150mm of monocrystalline fibre core 1;
Step 2 is chosen a quartzy parent tube, and the silica based bore is 10mm.Material with two kinds of different refractivities of MCVD lathe layering alternating deposit.In these two kinds of materials, high-index material be refractive index be 1.512 mix germanite English material, low-index material is that refractive index is 1.44 pure quartz material.Each deposit thickness is 47.6 μ m, and deposition is mixed each 20 layers on germanite English material layer and pure quartz material layer, processes the covering prefabricated component with bragg structure.
The covering prefabricated component with bragg structure that step 3 uses fiber drawing tower that step 2 is made draws, and shortens preparatory covering product center bore into 150 μ m;
The covering 200mm that step 4 intercepting step 3 draws, the monocrystalline fibre core 1 that step 1 is made inserts in its center pit, makes the end alignment of an end and the covering of monocrystalline fibre core 1, uses the oxyhydrogen flame sintering together; The other end at covering is connected with air extractor, and the vacuum tightness of bleeding is-3000pa;
Step 5 is being kept under the condition of vacuum tightness for-3000pa, and an end of sintering is fixed on the support, and the other end is connected with drawing machine; Use oxyhydrogen flame to begin heating from an end of sintering, and with the drawing machine covering that stretches.During heating, covering is softening, and under the effect of stretching and negative pressure, covering tightly wraps monocrystalline fibre core 1.Slowly move oxyhydrogen flame to the other end, whole coverings are tightened to becoming one with the monocrystalline plug, just process Prague cladding structure single crystal fiber after the cooling.The pure quartz material layer that deposits in the step 2 with mix germanite English material layer and become low refractive index material layer 2 and high-index material layer 3. in being bundled into through twice drawing by high temperature
The optical fiber that step 6 is processed step 5 with coating machine applies, and increases the intensity of single crystal fiber.
Embodiment six
Operation wavelength is the preparation method that 1550nm has bragg structure covering single crystal fiber, and is as shown in Figure 1, and manufacturing process may further comprise the steps:
Step 1 uses the method for crystal growth to make lithium niobate monocrystal fibre core 1, and its core diameter is 10 μ m, and length is 150mm;
Step 2 is chosen teflon and the tygon sleeve pipe that wall thickness is identical, diameter is different.Innermost layer is a teflon sleeve, and internal diameter is 11mm, wall thickness 0.2mm; The outer layer sleeve internal diameter increases 0.2mm successively, and wall thickness is 0.2mm, and teflon sleeve and teflon sleeve replace socket; Socket is 20 layers altogether, promptly processes the covering prefabricated component with bragg structure covering;
Step 3 intercepting one segment length is in the covering prefabricated component of monocrystalline fibre core 1; The monocrystalline fibre core 1 of packing into; The two is at one end alignd, use the sealing of oxyhydrogen flame sintering, air extractor is installed at the other end; Bled between monocrystalline fibre core 1 and the sleeve pipe and the gap between sleeve pipe and the sleeve pipe, and keep vacuum tightness and be-1000pa.One end of sintering is fixed on the support, and the other end is connected with drawing machine, uses electrical bar to begin heating from the sintering end, and with drawing machine stretching covering prefabricated component.During heating, the covering prefabricated component is softening, and under the effect that stretches with negative pressure, the different layers tube of the covering prefabricated component that softens and tightly wraps monocrystalline fibre core 1 together, has promptly processed to have bragg structure covering single crystal fiber.The teflon sleeve of socket and polyethylene jacket tube wall constitute the low refractive index material layer 2 and high-index material layer 3 in the covering respectively;
The bragg structure covering single crystal fiber that has that step 4 is made step 3 with coating machine applies, and strengthens the toughness of optical fiber.
Embodiment seven
Operation wavelength is 4 μ m preparation methods with bragg structure covering single crystal fiber, and shown in Fig. 3 and 4, manufacturing process may further comprise the steps:
Step 1 uses the method for crystal growth to make sapphire single-crystal fibre core 1, and its core diameter is 300 μ m, and length is 150mm;
Step 2 chooses that wall thickness is identical, major axis is all different with minor axis, cross section is the teflon and the tygon sleeve pipe of oval ring.Innermost layer is the tygon sleeve pipe, and the minor axis internal diameter is 50mm, and the major axis internal diameter is 70mm; Wall thickness 0.1mm; The outer layer sleeve internal diameter increases 0.1mm successively, and wall thickness is 0.1mm, and teflon sleeve and teflon sleeve replace socket; Socket is 20 layers altogether, promptly processes the covering prefabricated component with bragg structure covering;
Step 3 intercepting one segment length is in the covering prefabricated component of monocrystalline fibre core 1, the monocrystalline fibre core 1 of packing into.In order to keep keeping ellipse in the covering prefabricated component stretching contraction process,, respectively place the tygon rod 4 that a diameter is 42 μ m along monocrystalline fibre core 1 in the long axis direction outside in monocrystalline fibre core 1 both sides.Covering prefabricated component, sapphire single-crystal fibre core and tygon rod are at one end alignd, use the sealing of oxyhydrogen flame sintering, air extractor is installed at the other end, to monocrystalline fibre core, tygon rod and between the gap bleed, and keep vacuum tightness and be-1500pa.One end of sintering is fixed on the support, and the other end is connected with drawing machine, uses electrical bar to begin heating from the sintering end, and with drawing machine stretching covering prefabricated component.During heating, the covering prefabricated component is softening, under the effect that stretches with negative pressure, the different layers tube of softening covering prefabricated component together, and and the tygon rod tightly wrap monocrystalline fibre core 1 together, promptly processed and had bragg structure covering single crystal fiber.The teflon sleeve of socket and polyethylene jacket tube wall constitute the low refractive index material layer 2 and high-index material layer 3 in the covering respectively;
The bragg structure covering single crystal fiber that has that step 4 is made step 3 with coating machine applies, and strengthens the toughness of optical fiber.

Claims (3)

1. preparation method with bragg structure covering single crystal fiber is characterized in that:
Manufacturing process may further comprise the steps:
Step 1 is made monocrystalline fibre core (1), and its core diameter is 10～300 μ m;
Step 2 is chosen a quartzy parent tube, uses the MCVD method, two kinds of materials that layering alternating deposit refractive index is different, and each deposit thickness equates that each deposits 10～20 layers, processes the covering prefabricated component with bragg structure;
The covering prefabricated component that step 3 is made with heating arrangement heating steps two with bragg structure, and its center bore is pulled to is 100～500 μ m;
Step 4 intercepting one segment length is in the covering prefabricated component with bragg structure of monocrystalline fibre core (1); In the center pit of the covering that monocrystalline fibre core (1) inserting step three that step 1 is made is made; Make the end alignment of an end and the covering of monocrystalline fibre core (1); And sintering is together, and the other end of covering is connected with air extractor, the vacuum tightness of bleeding is-2000～-3000pa;
Step 5 keep internal vacuum-2000～-the 3000pa condition under; Use heating arrangement to begin heating from an end of sintering, and the stretching covering, under the effect of stretching and negative pressure; Covering tightly wraps fibre core (1); To the slow mobile heating device of the other end, tightly wrapped by covering until whole monocrystalline fibre cores (1), just processed bragg structure covering single crystal fiber after the cooling;
The optical fiber that step 6 is processed step 5 with coating machine applies, and strengthens the toughness of optical fiber.
2. a kind of preparation method according to claim 1 with bragg structure covering single crystal fiber,
It is characterized in that: the thickness of the sedimentary deposit of MCVD method calculates with the internal diameter of the quartzy parent tube of choosing according to single crystal fiber operation wavelength λ in the described step 2; After the covering prefabricated component forms the bragg structure covering through twice heat drawing; The sedimentary deposit that uses MCVD method deposition dwindles and becomes the different refractivity material layer along with the heat drawing geometric ratio, and the thickness d of every layer of material satisfies:
λ = 4 · d · n e f f
Wherein, n EffBe the corresponding effective refractive index of single crystal fiber operation wavelength.
3. preparation method with bragg structure covering single crystal fiber, it is characterized in that: manufacturing process may further comprise the steps:
Step 1 is made monocrystalline fibre core (1), and its core diameter is 10～300 μ m;
Step 2 is chosen teflon and the tygon sleeve pipe that wall thickness is identical, diameter is different; Teflon and tygon sleeve pipe replace socket, and the number of plies is 20～40 layers, promptly process the covering prefabricated component with bragg structure;
Step 3 intercepting one segment length is in the covering prefabricated component that monocrystalline fibre core (1) has bragg structure, and the monocrystalline fibre core (1) of packing at one end aligns the two; Sintering sealing is installed air extractor at the other end, is bled in the gap between monocrystalline fibre core and the sleeve pipe, between sleeve pipe and the sleeve pipe; And keep vacuum tightness and be-1000～-1500pa; Begin heating from the sintering end, and stretching covering prefabricated component, make each tube together; And tightly wrap monocrystalline fibre core (1), promptly processed and had bragg structure covering single crystal fiber;
The bragg structure covering single crystal fiber that has that step 4 is made step 3 with coating machine applies, and strengthens the toughness of optical fiber.
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CN109669232B (en) * 2019-01-17 2021-01-12 上海大学 Single crystal semiconductor core optical fiber and method for manufacturing the same
CN110217981A (en) * 2019-06-12 2019-09-10 华中科技大学 A kind of single crystal fiber and preparation method thereof
CN110699750A (en) * 2019-09-30 2020-01-17 中国科学院上海硅酸盐研究所 High-flexibility Al2O3Single crystal optical fiber and preparation method and application thereof
CN111484242B (en) * 2020-05-22 2021-07-13 长飞光纤光缆股份有限公司 Bragg optical fiber preform, Bragg optical fiber, preparation method and application thereof

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