CN113497404A - Rare earth doped hollow anti-resonance optical fiber and preparation method thereof - Google Patents
Rare earth doped hollow anti-resonance optical fiber and preparation method thereof Download PDFInfo
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- CN113497404A CN113497404A CN202110661335.8A CN202110661335A CN113497404A CN 113497404 A CN113497404 A CN 113497404A CN 202110661335 A CN202110661335 A CN 202110661335A CN 113497404 A CN113497404 A CN 113497404A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
Abstract
The invention provides a rare earth-doped hollow anti-resonance optical fiber and a preparation method thereof. Wherein, mix rare earth hollow anti-resonance optical fiber, include: an outer cladding; a plurality of glass tube rings, the glass tube rings including a deposition layer containing rare earth ions, the plurality of glass tube rings being fixed to an inner wall of the outer cladding; and the glass tube rings surround the air fiber core. According to the rare earth-doped hollow anti-resonance optical fiber provided by the invention, rare earth ions are introduced into the glass tube ring, and in the laser transmission process, the optical amplification is realized by using a gain mechanism caused by the rare earth ions in the glass tube ring, so that the optical fiber can perform optical-optical conversion, and simultaneously has the functions of optical amplification and laser transmission, thereby widening the application scene of the hollow anti-resonance optical fiber in an optical fiber laser.
Description
Technical Field
The invention relates to the technical field of optical transmission, in particular to a rare earth-doped hollow anti-resonance optical fiber and a preparation method thereof.
Background
The fiber laser uses an active fiber as a gain medium, has the advantages of small volume, good beam quality, high conversion efficiency, good heat dissipation performance and the like, and is widely applied to the fields of industrial processing, medical treatment and aerospace. The optical fiber laser mainly adopts rare earth doped double-clad large mode field optical fiber, and is mainly characterized by that in the high-purity quartz glass material matrix one or several rare earth elements are doped, then the optical fiber with specific form can be drawn. However, in the long-distance high-power laser transmission process, the conventional active optical fiber can cause wavelength conversion and laser damage because the silicon dioxide material has a strong nonlinear effect, so that the capability of the quartz optical fiber for transmitting laser is fundamentally limited, and the development of a high-power optical fiber laser is also limited.
Compared with solid optical fiber, the hollow optical fiber mainly restrains energy in an air fiber core, reduces the use of quartz material and fundamentally solves the intrinsic problem of the quartz material. Hollow-core optical fibers can be roughly classified into hollow-core band-gap photonic crystal fibers (PBG-PCF) and hollow-core anti-resonant fibers (NANF) according to the light guiding mechanism and the optical fiber structure of the optical fibers. The hollow-core band-gap photonic crystal fiber mainly utilizes the photonic band-gap effect to guide light, so that the problems of narrow optical fiber band, scattering of a fiber core surface mode and the like are determined. The hollow anti-resonance optical fiber conducts light in a leakage mode, and is a window capable of conducting light when the transverse propagation constant of light in the fiber core and the quartz tube ring do not resonate. In recent years, hollow-core anti-resonant fibers have the advantages of wider transmission spectrum, higher laser threshold damage, lower transmission loss and the like, and are rapidly hot spots of international research.
The hollow anti-resonance optical fiber generally adopts a structure that glass tube rings with equal intervals are nested in a glass tube, and light is guided by superposing mode coupling in the fiber core-glass tube ring through the anti-resonance effect of quartz thin walls around the fiber core. Due to its unique structural design, the hollow core anti-resonant fiber can be used to transmit near and mid infrared band (0.7-25um) spectra, and is widely used in fiber lasers of various wavelengths. However, the hollow-core anti-resonant fiber cannot amplify light while transmitting light like the conventional rare-earth doped fiber, which limits the integrated application of the hollow-core anti-resonant fiber in a high-power fiber laser.
Disclosure of Invention
The invention provides a rare earth-doped hollow anti-resonance optical fiber and a preparation method thereof, which are used for solving the defect that the hollow anti-resonance optical fiber in the prior art cannot perform light amplification like the traditional active optical fiber and realizing that the optical fiber has the functions of light amplification and laser transmission at the same time.
The invention provides a rare earth-doped hollow anti-resonance optical fiber, which comprises:
an outer cladding;
a plurality of glass tube rings, the glass tube rings including a deposition layer containing rare earth ions, the plurality of glass tube rings being fixed to an inner wall of the outer cladding;
and the glass tube rings surround the air fiber core.
According to the rare earth-doped hollow anti-resonant optical fiber provided by the invention, the cross section of the inner wall of the outer cladding layer is polygonal.
According to the rare earth-doped hollow anti-resonant optical fiber provided by the invention, the section of the inner wall of the outer cladding layer is a regular polygon, and the number of the sides of the regular polygon is more than four.
According to the rare earth-doped hollow anti-resonant optical fiber provided by the invention, at least one glass tube ring is fixed on each side of the inner wall of the outer cladding layer.
According to the rare earth-doped hollow anti-resonance optical fiber provided by the invention, the rare earth ions comprise one or a combination of Yb, Er, Tm, Nd, Dy, Pr and Ho.
According to the rare earth-doped hollow anti-resonance optical fiber provided by the invention, the glass tube ring further comprises a quartz glass layer, the quartz glass layer is attached to the deposition layer, the quartz glass layer is positioned on the inner layer of the glass tube ring, and the deposition layer is positioned on the outer layer of the glass tube ring.
According to the rare earth-doped hollow anti-resonance optical fiber provided by the invention, the numerical aperture of the glass tube ring is 0.05-0.3.
According to the rare earth-doped hollow anti-resonance optical fiber provided by the invention, the duty ratio of the glass tube ring is 0.5-0.95.
According to the rare earth-doped hollow anti-resonant optical fiber provided by the invention, the wall thickness T of the glass tube ringhole＝(m-0.5)λ[2(n1 2-n0 2)]-0.5Wherein m is the resonance order, n1Is the refractive index of the glass tube ring, n0Is the refractive index of air.
The invention also provides a preparation method of the rare earth-doped hollow anti-resonance optical fiber, which comprises the following steps:
step 1, preparing a rare earth ion-doped glass tube ring;
step 2, stretching the glass tube ring, and controlling the gas pressure in the glass tube within the pressure range of-50 mabr to +50mabr to draw the glass tube ring, so that the duty ratio of the glass tube ring is 0.4-0.95, and the diameter of the glass tube ring is 5-20 mm;
step 3, preparing an outer cladding layer with a regular polygon-shaped inner wall section, wherein the side length of the inner wall of the outer cladding layer is 5-25 mm;
step 4, fixing the glass tube rings obtained in the step 2 on the inner wall of the outer cladding to form a prefabricated rod, wherein 1-5 glass tube rings are fixed on each side of the inner wall of the outer cladding;
and 5, placing the prefabricated rod on a drawing tower for drawing, wherein the drawing temperature is 1200-2200 ℃, the drawing speed is 1-100 m/min, the gas pressure in the glass tube is controlled within the pressure range of-100 mabr to +100mabr to draw the glass tube ring, so as to adjust the wall thickness of the glass tube ring, and the wall thickness of the glass tube ring is obtained to be 0.1-5 um.
According to the rare earth-doped hollow anti-resonance optical fiber and the preparation method thereof, rare earth ions are introduced into the glass tube ring, and in the laser transmission process, the optical amplification is realized by utilizing a gain mechanism caused by the rare earth ions in the glass tube ring, so that the optical fiber can carry out optical-optical conversion. Compared with the hollow anti-resonance optical fiber provided in the prior art, the rare earth-doped hollow anti-resonance optical fiber provided by the invention has the functions of optical amplification and laser transmission, and widens the application scene of the hollow anti-resonance optical fiber in the optical fiber laser.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a rare-earth-doped hollow-core antiresonant optical fiber provided in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a rare-earth-doped hollow-core antiresonant optical fiber provided in example 2 of the present invention;
FIG. 3 is a schematic structural diagram of a rare-earth-doped hollow-core antiresonant optical fiber provided in example 3 of the present invention;
reference numerals:
11: an outer cladding; 12: a glass tube ring; 121: depositing a layer;
122: a quartz glass layer; 13: an air core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The rare-earth doped hollow-core antiresonant fibers and the methods for making the same according to the present invention are described below with reference to fig. 1-3.
Referring to fig. 1 to 3, the rare-earth doped hollow-core antiresonant optical fiber includes:
an outer cladding 11;
a plurality of glass tube rings 12, the glass tube rings 12 including a deposition layer 121 containing rare earth ions, the plurality of glass tube rings 12 being fixed to an inner wall of the outer cladding layer 11;
and an air core 13, wherein a plurality of the glass tube rings 12 surround the air core 13.
The outer cladding 11 is a supporting structure for the optical fiber, and ensures that the glass tube ring 12 can be fixed on its inner wall and maintain a geometric shape without participating in the light guiding process, and the material thereof may be pure quartz glass, and may also be other kinds of glass materials, including but not limited to ordinary silicate glass or various soft glass materials.
The glass tube ring 12 is a tubular structure with a circular cross section, the deposition layer 121 is a glass material doped with rare earth ions, and the anti-resonance effect can be achieved by controlling the wall thickness.
Generally, air core 13 is a circular area surrounded by a plurality of glass tube rings 12.
In this embodiment, rare earth ions are introduced into the glass tube ring 12, and in the laser transmission process, optical amplification is achieved by using a gain mechanism caused by the rare earth ions in the glass tube ring 12, so that the optical fiber can perform optical-to-optical conversion. Compared with the hollow anti-resonance optical fiber provided in the prior art, the rare earth-doped hollow anti-resonance optical fiber provided by the invention has the functions of optical amplification and laser transmission, and widens the application scene of the hollow anti-resonance optical fiber in the optical fiber laser.
Referring to fig. 1 to 3, in an embodiment of the present invention, a plurality of glass tube rings 12 are uniformly spaced.
The plurality of glass tube rings 12 are uniformly arranged around the air fiber core 13 at intervals, and the circular area surrounded and tangent by the plurality of glass tube rings 12 is the air fiber core 13, so that the air fiber core 13 is concentrated in the air fiber core 13 during light guiding, and the transmission loss is reduced.
Referring to fig. 1 to 3, in an embodiment of the present invention, the cross-section of the inner wall of the outer cladding 11 is polygonal, and preferably, the cross-section of the inner wall of the outer cladding 11 is regular polygon, and the number of sides of the regular polygon is greater than four.
The present embodiment is preferably a regular polygon, such as a square, a regular hexagon or a regular octagon, and specifically, referring to the embodiments described later, the glass tube ring 12 is fixed on the edge of the inner wall thereof, so that the centers of a plurality of tube rings having the same shape are the air cores 13 after being fixed. In this embodiment, compared with a circular cross section, the cross section of the inner wall of the outer cladding 11 is set to be a regular polygon, so that the guided light is more concentrated at the center of the air fiber core 13, and meanwhile, the number of times that the pump light passes through the glass tube ring 12 is increased by optimizing the inner wall structure of the outer cladding 11, so that the hollow anti-resonant fiber with higher conversion efficiency can be obtained.
Further, at least one glass tube ring 12 is fixed on each side of the inner wall of the outer cladding layer 11.
In this embodiment, 1 to 5 glass tube rings 12 are uniformly arranged on each side of the inner wall of the outer cladding 11, which can be determined according to the specific optical fiber structure.
Referring to fig. 1 to fig. 3, in an embodiment of the present invention, the rare earth ions include one or a combination of Yb, Er, Tm, Nd, Dy, Pr, and Ho.
The rare earth ions are doped in the deposition layer 121 of the glass tube ring 12, so that the optical fiber has a light amplification function. One or a combination of these dopants may be used, such as Er, Pr, and Tm doped glass tube ring 12. Of course, the present invention is not limited to the rare earth ions given above, and will not be described in detail.
Referring to fig. 1, in addition, in an embodiment of the invention, the glass tube ring 12 further includes a quartz glass layer 122, the quartz glass layer 122 is attached to the deposition layer 121, the quartz glass layer 122 is located on an inner layer of the glass tube ring 12, and the deposition layer 121 is located on an outer layer of the glass tube ring 12.
The refractive index of the silica glass layer 122 is different from that of the deposition layer 121, and the silica glass layer 122 is additionally provided, so that light penetration can be avoided, and the loss of the optical fiber can be reduced. In this embodiment, when the deposition layer 121 is the outer layer of the glass tube ring 12, the air core 13 is mainly used for guiding light, and in another embodiment, when the through hole of the glass tube ring 12 is used for guiding light, the deposition layer 121 is located at the inner layer, and the quartz glass layer 122 is located at the outer layer.
In other embodiments, only one deposition layer 121 may be provided. In yet another embodiment, multiple layers of different index quartz glass 122 may be provided to further reduce losses. Furthermore, a plurality of deposition layers 121 may be disposed, such as the deposition layers 121 disposed on the inner and outer layers of the glass tube ring 12, so as to achieve better optical amplification of the optical fiber.
Referring to fig. 1 to 3, in an embodiment of the present invention, the numerical aperture of the glass tube ring 12 is 0.05 to 0.3. In addition, the duty ratio of the glass tube ring 12 is 0.5-0.95.
Furthermore, the wall thickness T of the glass tube ring 12hole＝(m-0.5)λ[2(n1 2-n0 2)]-0.5Wherein m is the resonance order, n1Is the refractive index of the glass tube ring 12, n0Is the refractive index of air and λ is the wavelength of light. The wall thickness of the glass tube ring 12 determined by this formula allows the formation of a hollow core anti-resonant fiber with a specific transmission window when the wall thickness is within the anti-resonant region.
In summary, the present invention provides three specific embodiments.
Referring to fig. 1, in example 1, a rare earth-doped hollow anti-resonant fiber with a regular hexagonal inner hole is shown.
Specifically, the cross-section of the inner wall of the outer cladding layer 11 is regular hexagon, the side length range is 30-150 um, the material is pure quartz, and the duty ratio of the outer cladding layer 11 is 0.3-0.9.
The glass tube ring 12 comprises an outer rare earth-doped deposition layer 121 and an inner quartz glass layer 122, wherein the deposition layer 121 is made of glass materials, the numerical aperture of the deposition layer is 0.1-0.3, and the thickness of the outer wall is as follows: the inner layer wall thickness is 1:2, the diameter of the glass tube ring 12 is 20-60 mm, and the duty ratio of the glass tube ring 12 is 0.7-0.95.
The number of the glass tube rings 12 is 6, each glass tube ring 12 is fixed at the center of one side of the inner wall of the outer cladding 11, the circular area where the 6 glass tube rings 12 are internally tangent is an air fiber core 13, and the size and the diameter of the air fiber core are changed along with the width of the inner wall of the outer cladding 11 and the diameter of the glass tube ring 12.
The optical fiber has the functions of light amplification and light transmission, and the light spot of the led-out light is close to a circle.
Referring to fig. 2, in example 2, a rare earth-doped hollow anti-resonant fiber with a regular octagonal inner hole is shown.
Specifically, the cross-section of the inner wall of the outer cladding layer 11 is regular octagon, the side length range is 30-90 um, the material is pure quartz, and the duty ratio of the outer cladding layer 11 is 0.3-0.9.
The glass tube ring 12 comprises a single-layer rare earth-doped deposition layer 121, the deposition layer 121 is made of glass materials, the numerical aperture of the deposition layer is 0.1-0.3, the diameter of the glass tube ring 12 is 20-60 mm, and the duty ratio of the glass tube ring 12 is 0.7-0.95.
The number of the glass tube rings 12 is 8, each glass tube ring 12 is fixed at the center of one side of the inner wall of the outer cladding 11, the circular area where the 8 glass tube rings 12 are internally tangent is an air fiber core 13, and the size and the diameter of the air fiber core are changed along with the width of the inner wall of the outer cladding 11 and the diameter of the glass tube ring 12.
The optical fiber has the functions of light amplification and light transmission, and the light spot of the led-out light is close to a circle.
Referring to fig. 3, in example 3, a rare earth-doped hollow anti-resonant fiber with a square inner hole is shown.
Specifically, the cross section of the inner wall of the outer cladding layer 11 is square, the side length range is 30-150 um, the material of the inner wall is pure quartz, and the duty ratio of the outer cladding layer 11 is 0.3-0.9.
The glass tube ring 12 comprises a single-layer rare earth-doped deposition layer 121, the deposition layer 121 is made of glass materials, the numerical aperture of the deposition layer is 0.1-0.3, the diameter of the glass tube ring 12 is 20-50 mm, and the duty ratio of the glass tube ring 12 is 0.7-0.95.
The number of the glass tube rings 12 is 8, three glass tube rings 12 which are uniformly distributed are fixed on each side of the inner wall of the outer cladding 11, the circular areas where the 8 glass tube rings 12 are internally tangent are air fiber cores 13, and the size and diameter of the air fiber cores are changed along with the width of the inner wall of the outer cladding 11 and the diameter of the glass tube rings 12.
The optical fiber has the functions of light amplification and light transmission, and the light spot of the led-out light is close to a square shape.
In addition, the invention also provides a preparation method of the rare earth-doped hollow anti-resonance optical fiber, which comprises the following steps:
step 1, preparing a rare earth ion doped glass tube ring 12; specifically, the glass tube doped with rare earth is manufactured by MCVD or OVD technology, and in an embodiment, the glass tube ring 12 includes an inner ring structure and an outer ring structure, which are a pure quartz glass layer 122 and a deposition layer 121 doped with rare earth ions. Here, the deposition layer 121 may be either an outer layer or an inner layer according to the manufacturing process. Wherein the numerical aperture of the deposition layer 121 is 0.05-0.5, and the thickness is 1-5 mm, and then the glass tube ring 12 is specially processed to obtain the glass tube ring 12 with a proper thickness ratio (deposition layer 121: quartz glass layer 122), although the quartz material can be selectively stripped completely here, and only a single deposition layer 121 remains.
Step 2, stretching the glass tube ring 12, and controlling the gas pressure in the glass tube within the pressure range of-50 mabr to +50mabr to draw the glass tube ring 12, so as to obtain the glass tube ring 12 with the duty ratio of 0.4-0.95 and the diameter of the glass tube ring 12 of 5-20 mm;
step 3, preparing an outer cladding layer 11 with a regular polygon-shaped inner wall section, wherein the side length of the inner wall of the outer cladding layer 11 is 5-25 mm;
step 4, fixing the glass tube rings 12 obtained in the step 2 on the inner wall of the outer cladding 11 to form a prefabricated rod, wherein 1-5 glass tube rings 12 are fixed on each side of the inner wall of the outer cladding 11;
and 5, placing the prefabricated rod on a drawing tower for drawing, wherein the drawing temperature is 1200-2200 ℃, the drawing speed is 1-100 m/min, the gas pressure in the glass tube is controlled within the pressure range of-100 mabr to +100mabr to draw the glass tube ring 12, so as to adjust the wall thickness of the glass tube ring 12, and the wall thickness of the glass tube ring 12 is 0.1-5 microns.
The rare earth-doped hollow anti-resonance optical fiber obtained by the method has the functions of light amplification and light transmission, and is wider in application range and more in scenes.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A rare earth doped hollow core anti-resonant optical fiber, comprising:
an outer cladding;
a plurality of glass tube rings, the glass tube rings including a deposition layer containing rare earth ions, the plurality of glass tube rings being fixed to an inner wall of the outer cladding;
and the glass tube rings surround the air fiber core.
2. The rare-earth doped hollow-core antiresonant fiber of claim 1, wherein the inner wall of the outer cladding is polygonal in cross-section.
3. The rare-earth doped hollow-core antiresonant optical fiber of claim 2, wherein the inner wall of the outer cladding has a cross-section of a regular polygon, the number of sides of the regular polygon being greater than four.
4. The rare-earth doped hollow core antiresonant optical fiber of claim 3, wherein at least one of the glass ferrule is fixed to each side of the inner wall of the outer cladding.
5. The rare-earth doped hollow-core anti-resonant fiber according to any one of claims 1 to 4, wherein the rare-earth ions comprise one of Yb, Er, Tm, Nd, Dy, Pr, Ho, or a combination thereof.
6. The rare-earth-doped hollow-core antiresonant optical fiber according to any one of claims 1 to 4, wherein the glass tube ring further comprises a quartz glass layer, the quartz glass layer is attached to the deposition layer, the quartz glass layer is located at an inner layer of the glass tube ring, and the deposition layer is located at an outer layer of the glass tube ring.
7. The rare-earth doped hollow-core antiresonant optical fiber according to any one of claims 1 to 4, wherein the numerical aperture of the glass ferrule is 0.05-0.3.
8. The rare-earth doped hollow-core antiresonant optical fiber according to any one of claims 1-4, wherein the glass tube loop has a duty cycle of 0.5-0.95.
9. The rare-earth doped hollow-core antiresonant optical fiber according to any one of claims 1 to 4, wherein the wall thickness T of the glass tube ringhole＝(m-0.5)λ[2(n1 2-n0 2)]-0.5Wherein m is the resonance order, n1Is the refractive index of the glass tube ring, n0Is the refractive index of air.
10. A method for preparing a rare earth-doped hollow anti-resonant optical fiber is characterized by comprising the following steps:
step 1, preparing a rare earth ion-doped glass tube ring;
step 2, stretching the glass tube ring, and controlling the gas pressure in the glass tube within the pressure range of-50 mabr to +50mabr to draw the glass tube ring, so that the duty ratio of the glass tube ring is 0.4-0.95, and the diameter of the glass tube ring is 5-20 mm;
step 3, preparing an outer cladding layer with a regular polygon-shaped inner wall section, wherein the side length of the inner wall of the outer cladding layer is 5-25 mm;
step 4, fixing the glass tube rings obtained in the step 2 on the inner wall of the outer cladding to form a prefabricated rod, wherein 1-5 glass tube rings are fixed on each side of the inner wall of the outer cladding;
and 5, placing the prefabricated rod on a drawing tower for drawing, wherein the drawing temperature is 1200-2200 ℃, the drawing speed is 1-100 m/min, the gas pressure in the glass tube is controlled within the pressure range of-100 mabr to +100mabr to draw the glass tube ring, so as to adjust the wall thickness of the glass tube ring, and the wall thickness of the glass tube ring is obtained to be 0.1-5 um.
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| CN115521059A (en) * | 2022-10-31 | 2022-12-27 | 长飞光纤光缆股份有限公司 | Hollow-core microstructure optical fiber preform, optical fiber and preparation method thereof |
| CN115521059B (en) * | 2022-10-31 | 2023-11-28 | 长飞光纤光缆股份有限公司 | Hollow microstructure optical fiber preform, optical fiber and preparation method thereof |
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