CN209989258U - Optical fiber preform - Google Patents
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- CN209989258U CN209989258U CN201822112835.2U CN201822112835U CN209989258U CN 209989258 U CN209989258 U CN 209989258U CN 201822112835 U CN201822112835 U CN 201822112835U CN 209989258 U CN209989258 U CN 209989258U
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Abstract
The utility model provides an optical fiber perform, optical fiber perform includes cladding and first surrounding layer in alkali metal sandwich layer, fluorine chlorine codoped inner cladding, irrigation canals and ditches layer, well cladding, the supplementary cladding from inside to outside in proper order, well cladding is step index of refraction distribution or gradual change formula index of refraction distribution with supplementary well cladding. The utility model provides an optical fiber perform effectively improves the viscosity matching nature between sandwich layer, inner cladding and both borders, reduces the optical fiber loss.
Description
Technical Field
The utility model relates to an optic fibre field especially relates to an optical fiber perform.
Background
With the development of optical communication technology, the reduction of optical fiber loss is beneficial to the construction and maintenance cost of the system. For optical fiber manufacturing enterprises, how to reduce the optical fiber loss needs to be considered in the controllable range of the cut-off wavelength, the mode field diameter and the zero dispersion wavelength of the optical fiber. It is known that the attenuation and optical parameter performance of the optical fiber depend on the performance of the optical fiber preform, and for the quartz optical fiber, the loss at 600nm to 1600nm mainly comes from rayleigh scattering, and in order to reduce the optical fiber loss, the rayleigh scattering of the optical fiber can be effectively reduced by reducing the doping concentration of the optical fiber. However, rayleigh scattering of the fiber is affected by density fluctuations in addition to the doping concentration. The pure silicon core design in the traditional process easily causes viscosity mismatching between the core layer and the cladding layer to cause density fluctuation, so that Rayleigh scattering cannot be improved, and loss cannot be reduced.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide an optical fiber preform capable of reducing optical fiber loss.
The optical fiber preform comprises an alkali metal core layer, a fluorine-chlorine co-doped inner cladding layer, a channel layer, a middle cladding layer, an auxiliary middle cladding layer and a first outer cladding layer from inside to outside in sequence, wherein the alkali metal concentration is distributed from inside to outside in a gradient manner.
Further, the optical fiber preform also comprises a second outer cladding, the second outer cladding is coated outside the first outer cladding, the radius r7 of the second outer cladding is 62.5 mu m, the refractive index △ n7 is 0.02% -0.04%, and the viscosity is 5.5 multiplied by 107～6.8×107Pa·s。
Further, the middle cladding and the auxiliary middle cladding are in step-type refractive index distribution or graded-type refractive index distribution.
Further, it is characterized byThe radius r1 of the core layer is 3-7 mu m, the refractive index △ n1 of the core layer is-0.05%, and the viscosity is 3.0 multiplied by 107～3.5×107Pa·s。
Furthermore, the radius r2 of the inner cladding is 6-20 μm, the refractive index △ n2 of the inner cladding is-0.15% -0.25%, and the viscosity is 3.3 multiplied by 107～3.8×107Pa·s。
Furthermore, the radius r3 of the channel layer is 15-28 μm, the refractive index △ n3 of the channel layer is-0.3% -0.5%, and the viscosity is 3.0 multiplied by 107～3.6×107Pa·s。
Furthermore, the radius r4 of the middle cladding is 25-33 μm, the refractive index △ n4 of the middle cladding is-0.15% -0.20%, and the viscosity is 3.8 x 107～4.4×107Pa·s。
Furthermore, the radius r5 of the auxiliary middle cladding is 35-45 μm, the refractive index △ n5 of the auxiliary middle cladding is-0.05% -0.1%, and the viscosity is 4.7 x 107～5.0×107Pa·s。
Further, the radius r6 of the first outer cladding layer is 55-62.5 μm, the refractive index is △ n6 is 0%, and the viscosity is 5.1 × 107～5.2×107Pa·s。
The utility model provides an optical fiber perform sets up alkali metal in the sandwich layer, can reduce sandwich layer viscosity by a wide margin, sets up fluorine element, chlorine element in the inner cladding, and the alkali metal element concentration distribution in the recombination sandwich layer can eliminate or alleviate the boundary effect of sandwich layer and inner cladding by a wide margin, improves the viscosity matching nature between sandwich layer, inner cladding and the both borders, reduces the optical fiber loss.
Drawings
Fig. 1 is a schematic structural diagram of a deposition apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of a structure of a torch in the deposition apparatus shown in fig. 1.
Fig. 3 is a schematic flow chart of a method for manufacturing an optical fiber preform according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the medium cladding layer and the auxiliary medium cladding layer in an embodiment of the present invention being graded-index refractive indexes.
Fig. 5 is another schematic diagram of the intermediate cladding and the auxiliary intermediate cladding in an embodiment of the present invention having graded refractive index.
Fig. 6 is a schematic view illustrating a step-index type of distributed refractive index of the middle cladding and the auxiliary middle cladding according to an embodiment of the present invention.
Fig. 7 is a schematic view of a refractive index distribution of an optical fiber preform according to an embodiment of the present invention.
FIG. 8 is a graph showing a viscosity profile corresponding to the refractive index profile of the optical fiber preform of FIG. 5.
Description of the main elements
The following detailed description of the invention will be further described in conjunction with the above-identified drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a deposition apparatus 100 according to an embodiment of the present invention, the deposition apparatus 100 includes a torch 10, a glass tube 20 and a plasma resonant cavity 30, the torch 10 is communicated with one end of the glass tube 20, the other end of the glass tube 20 is opposite to an optical fiber preform 40, the plasma resonant cavity 30 is sleeved outside the glass tube 20, and the plasma resonant cavity 30 is used for exciting a gas entering the glass tube 20 into a plasma 31, and then a reaction product is deposited on a surface of the optical fiber preform 40.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the torch 10, in which the torch 10 includes a first nitrogen-containing gas pipeline 11 located at the center, a silicon tetrachloride gas pipeline 12, an oxygen pipeline 13, and an argon pipeline 14 concentrically arranged in sequence with the first nitrogen-containing gas pipeline 11, and the oxygen pipeline 13 is further provided with a plurality of second nitrogen-containing gas pipelines 15. In the present embodiment, the number of the second nitrogen-containing gas pipes 15 is 6 and is uniformly arranged along the circumferential direction of the oxygen pipe 13.
Referring to fig. 3, the present invention further provides a method for manufacturing an optical fiber preform, which comprises the following steps:
step S31, preparing a core layer and an inner cladding layer by adopting a vapor deposition process, introducing a dopant containing alkali metal into the core layer in the deposition process to form a silicon core layer containing alkali metal, and forming a powder rod by surrounding the surface of the core layer with the inner cladding layer of pure silicon dioxide powder;
step S32, placing the powder rod in a sintering furnace for dehydroxylation and vitrification sintering;
step S33, preparing a trench layer, a middle cladding layer and an auxiliary middle cladding layer in sequence by adopting a fluorine doping process;
step S34, preparing an outer cladding layer by adopting a vapor deposition process or a pure silica sleeve process to obtain an optical fiber prefabricated rod.
The method also comprises the steps of introducing silicon tetrachloride gas, nitrogen-containing gas, oxygen and argon, and reacting in deposition equipment to generate SiOxNy(1<x<2，0<y<1) And SiO2Outsourcing of product deposition in said step S34The surface of the layer, forming a second outer cladding. The second overclad is prepared by the deposition apparatus 100, specifically, silicon tetrachloride gas, nitrogen-containing gas, oxygen and argon are sequentially introduced into each pipeline of the torch 10, and after entering the glass tube 20, each gas is excited into plasma 31 (as shown in fig. 1) by the plasma resonant cavity 30 to react to generate SiOxNy(1<x<2，0<y<1) And SiO2The resultant is deposited on the surface of the outer cladding of the optical fiber preform 40 to form a second outer cladding. The nitrogen-containing gas comprises N2NO and NO2One kind of (1).
The dopant in the step S31 is carried in by a carrier gas, wherein the carrier gas is one of argon, oxygen and nitrogen, and the flow rate of the carrier gas is 20cc/min to 150 cc/min. The alkali metal comprises one or the combination of at least two of lithium, sodium, potassium and rubidium. The dopant also includes germanium, fluoride, or a combination of both. And the core layer in the step S31 is deposited by a core layer blowtorch, and the core layer blowtorch is arranged along the horizontal direction and forms an included angle of 30-90 degrees with the horizontal direction.
And in the step S32, after the dehydroxylation is finished, raising the vitrification temperature to 1200-1300 ℃, introducing silicon tetrachloride gas with the flow rate of 0.5-5 g/min, keeping the temperature for 2-6 h, introducing fluoride gas with the flow rate of 200-1000 cc/min, and keeping the temperature for 2-6 h, and after the step is finished, further raising the temperature to more than 1350 ℃ for sintering until the powder rod forms a transparent glass body. The fluoride in the step S31 and the step S32 includes SiF4、CF4、SF6、C2F6、SOF2And C2F2Cl2Or a combination of at least two thereof.
As shown in fig. 4 and 5, the intermediate cladding and the auxiliary intermediate cladding in step S33 have graded-index profiles. As shown in fig. 6, the middle cladding and the auxiliary middle cladding in step S33 have a step-index profile.
The fluorine doping process in step S33 includes a gas phase synthesis fluorine-doped sintering process, a fluorine-doped deposition process in the tube, and a fluorine-doped sleeve collapsing process.
The outer cladding in step S34 is pure silica, and the second outer cladding is a nitrogen-doped quartz glass layer.
Referring to fig. 7 and 8, the optical fiber preform prepared by the above method sequentially comprises a core layer, an inner cladding layer, a trench layer, a middle cladding layer, an auxiliary middle cladding layer, a first outer cladding layer and a second outer cladding layer from inside to outside, wherein the radius r1 of the core layer is 3-7 μm, the refractive index of the core layer is △ n1 which is-0.05%, and the viscosity is 3.0 × 107～3.5×107Pa.s, the radius r2 of the inner cladding is 6-20 μm, the refractive index △ n2 of the inner cladding is-0.15% -0.25%, and the viscosity is 3.3 multiplied by 107～3.8×107Pa.s, the radius r3 of the channel layer is 15-28 mu m, the refractive index △ n3 of the channel layer is-0.3% -0.5%, and the viscosity is 3.0 multiplied by 107～3.6×107Pa.s, radius r4 of the middle cladding of 25-33 μm, refractive index △ n4 of the middle cladding of-0.15% -0.20%, and viscosity of 3.8 × 107～4.4×107Pa.s, the radius r5 of the auxiliary middle cladding is 35-45 μm, the refractive index △ n5 of the auxiliary middle cladding is-0.05% -0.1%, and the viscosity is 4.7 x 107～5.0×107Pa.s, the radius r6 of the first outer cladding layer is 55-62.5 μm, the refractive index is △ n6 is 0%, and the viscosity is 5.1 multiplied by 107～5.2×107Pa.s, radius r7 of the second outer cladding of 62.5 μm, refractive index △ n7 of 0.02-0.04%, and viscosity of 5.5 × 107～6.8×107Pa · s. The viscosity number is the viscosity number at 1700 ℃.
The core layer is provided with a dopant containing alkali metal, and the dopant also comprises germanium, fluoride or a combination of the germanium and the fluoride. The radial alkali metal concentration in the core layer is gradually distributed from inside to outside. The middle cladding and the auxiliary middle cladding are in step-type refractive index distribution or graded-type refractive index distribution. And a nitrogen-containing structure is arranged in the second outer cladding, and fluorine and chlorine are arranged in the inner cladding.
The effective area of the optical fiber obtained after the optical fiber preform is drawn is 80 mu m2～130μm2Attenuation at 1550nm wavelength is lower than 0.165dB/km,when the cable is wound by one turn with the bending radius R of 10mm, the bending loss at the wavelength of 1550nm and 1625nm is lower than 0.02dB, and the cable wavelength is lower than 1530 nm.
The present invention will be further described with reference to specific examples.
Example 1
Firstly, preparing a core layer and an inner cladding layer by VAD vapor deposition technology, introducing KCl into the core layer in the deposition process, introducing Ar gas into the KCl layer through carrier gas Ar, controlling the flow rate of Ar to be 20cc/min, introducing GeCl4 gas into the core layer, controlling the flow rate to be 50cc/min, forming a silicon core layer containing K, and forming a powder rod by surrounding the surface of the core layer with the inner cladding layer of pure silicon dioxide powder.
And (4) dehydroxylating and vitrifying sintering the deposited powder rod in a sintering furnace. Wherein, after the dehydroxylation is finished and the glass transition temperature is raised to 1200 ℃, SiCl is introduced4Gas with the flow rate of 0.5g/min and the constant temperature time of 6h, and then SiF is introduced4The gas flow rate is 200cc/min, and the constant temperature time is 6 h. After the constant temperature stage is finished, further heating to 1350 ℃, and sintering until the transparent glass body is formed.
And (3) depositing a channel layer, a middle cladding and an auxiliary middle cladding layer by adopting an OVD (over-voltage diode) gas-phase synthesis fluorine-doped sintering process to form section structures with different sizes and refractive indexes.
And preparing an outer cladding layer by adopting an OVD vapor deposition process to obtain the optical fiber preform.
The obtained optical fiber preform has refractive index profile characterized by a core radius r1 of 3.8 μm, a core relative refractive index △ n1 of 0.05%, and a viscosity of 3.47 × 107Pa.s, inner cladding radius r2 of 8 μm, relative refractive index △ n2 of-0.15%, and viscosity of 3.62 × 107Pa.s, a trench layer radius r3 of 16 μm, a trench layer relative refractive index △ n3 of-0.35%, and a viscosity of 3.42 × 107Pa.s, radius r4 of the middle cladding layer of 25 μm, relative refractive index △ n4 of the middle cladding layer of-0.16%, and viscosity of 4.2 × 107Pa.s, radius r5 of auxiliary middle cladding of 35 μm, relative refractive index △ n5 of-0.07%, and viscosity of 4.82 × 107Pa.s, the middle cladding and the auxiliary middle cladding have step-type refractive index distribution, the radius r6 of the outer cladding is 62.5 μm, and the relative refractive index of the outer cladding is △ n60% viscosity of 5.1X 107Pa·s。
And (3) drawing the optical fiber preform, wherein the optical fiber test result is as follows: the effective area of the optical fiber is 82 μm21550nm attenuation 0.169dB/km, with bending losses of 0.014dB and 0.019dB at 1550nm and 1625nm respectively, and a cable wavelength of 1420nm, when wound one turn with a bending radius R of 10 mm.
Example 2
Firstly, preparing a core layer and an inner cladding layer by VAD vapor deposition technology, introducing KBr into the core layer in the deposition process, and leading the KBr to pass through carrier gas O2Into, O2Controlling the flow rate at 80cc/min, and introducing GeCl4The gas flow rate is controlled at 80cc/min, SiF is introduced4The gas flow is controlled at 100cc/min, a K-containing silicon core layer is formed, and an inner cladding layer of pure silicon dioxide powder surrounds the surface of the core layer to form a powder rod.
And (4) dehydroxylating and vitrifying sintering the deposited powder rod in a sintering furnace. Wherein, after the dehydroxylation is finished and the glass transition temperature is raised to 1200 ℃, SiCl is introduced4Gas with the flow rate of 2.5g/min and the constant temperature time of 6 hours, and then SiF is introduced4The gas flow rate is 600cc/min, and the constant temperature time is 4 h. After the constant temperature stage is finished, further heating to 1350 ℃, and sintering until the transparent glass body is formed.
And depositing a channel layer, a middle cladding and an auxiliary middle cladding by adopting an MCVD (gas phase chemical vapor deposition) gas-phase synthesis fluorine-doped sintering process, wherein in the MCVD deposition process, the fluorine-doped flow during the preparation of the channel layer is kept stably introduced, and the fluorine-doped flow during the preparation of the middle cladding and the auxiliary middle cladding is changed in a gradual change manner to form section structures with different sizes and refractive indexes.
And preparing an outer cladding layer by adopting a pure silicon dioxide sleeve process to obtain the optical fiber preform.
The obtained optical fiber preform had refractive index profile characterized by a core radius r1 of 5.3 μm, a core relative refractive index △ n1 of 0.03%, and a viscosity of 3.26X 107Pa.s, inner cladding radius r2 of 15 μm, relative refractive index △ n2 of-0.2%, and viscosity of 3.42 × 107Pa.s, a trench layer radius r3 of 20 μm, a trench layer relative refractive index △ n3 of-0.4%, and a viscosity of 3.3 × 107Pa · s; middle cladding radius r4 and auxiliaryThe sum of the intermediate layer radius r5 is 40 μm, the relative refractive index of the intermediate cladding △ n4 to the auxiliary intermediate layer △ n5 is gradually changed from-0.15% to 0%, and the viscosity is changed from 4.0 × 107Pa s gradient was 5.1X 107Pa.s, graded index distribution of the middle cladding and the auxiliary middle cladding, radius r6 of the outer cladding of 62.5 μm, relative refractive index △ n6 of the outer cladding of 0%, viscosity of 5.1 × 107Pa·s。
And (3) drawing the optical fiber preform, wherein the optical fiber test result is as follows: the effective area of the optical fiber is 95 μm21550nm attenuation 0.165dB/km, with a bending radius R of 10mm, with bending losses of 1550nm and 1625nm of 0.011dB and 0.018dB, respectively, and a cable wavelength 1480 nm.
Example 3
Firstly, preparing a core layer and an inner cladding layer by VAD vapor deposition technology, introducing KBr into the core layer in the deposition process, introducing KBr into the core layer through carrier gas Ar, controlling the flow rate of Ar to be 120cc/min, introducing GeCl4 gas, controlling the flow rate to be 80cc/min, and introducing SiF4The gas flow is controlled at 120cc/min, a K-containing silicon core layer is formed, and an inner cladding layer of pure silicon dioxide powder surrounds the surface of the core layer to form a powder rod.
And (4) dehydroxylating and vitrifying sintering the deposited powder rod in a sintering furnace. Wherein, after the dehydroxylation is finished and the glass transition temperature is raised to 1200 ℃, SiCl is introduced4Gas with the flow rate of 5g/min and the constant temperature time of 4 hours, and then CF is introduced4The gas flow rate is 200cc/min, and the constant temperature time is 6 h. After the constant temperature stage is finished, further heating to 1350 ℃, and sintering until the transparent glass body is formed.
And (3) depositing a channel layer, a middle cladding and an auxiliary middle cladding layer by adopting an OVD (over-voltage diode) gas-phase synthesis fluorine-doped sintering process to form section structures with different sizes and refractive indexes.
And preparing an outer cladding layer by adopting an OVD vapor deposition process, extending the glass rod subjected to outer cladding layer deposition to 60mm, placing the glass rod on a machine table with a plasma resonant cavity, and performing second outer cladding layer deposition to obtain the optical fiber preform.
The refractive index profile of the obtained optical fiber preform is characterized in that the radius r1 of the core layer is 6.5 mu m, the relative refractive index △ n1 of the core layer is 0.02 percent, and the refractive index profile is viscousDegree of 3.1X 107Pa.s, inner cladding radius r2 of 18 μm, relative refractive index △ n2 of-0.2%, and viscosity of 3.38 × 107Pa.s, a trench layer radius r3 of 27 μm, a trench layer relative refractive index △ n3 of-0.45%, and a viscosity of 3.25 × 107Pa.s, the radius r4 of the intermediate cladding is 32 μm, the relative refractive index △ n4 of the intermediate cladding is-0.18%, and the viscosity eta 4 is 3.87 multiplied by 107Pa.s, auxiliary middle cladding radius r5 of 40 μm, relative refractive index △ n5 of-0.07%, and viscosity of 4.8 × 107Pa.s, the middle cladding and the auxiliary middle cladding have step-type refractive index distribution, the radius r6 of the outer cladding is 55 μm, the relative refractive index △ n6 of the outer cladding is 0%, and the viscosity is 5.1 × 107Pa.s, a second outer cladding radius r7 of 62.5 μm, a relative refractive index △ n7 of the second outer cladding of 0.02%, and a viscosity of 6.5 × 107Pa·s。
And (3) drawing the optical fiber preform, wherein the optical fiber test result is as follows: the effective area of the optical fiber is 125 μm21550nm attenuation 0.163dB/km, with bending losses of 0.012dB and 0.018dB respectively at a bending radius R of 10mm, at a cable wavelength of 1525 nm.
The utility model provides an optical fiber perform sets up alkali metal in the sandwich layer, can reduce sandwich layer viscosity by a wide margin, sets up fluorine element, chlorine element in the inner cladding, and the alkali metal element concentration distribution in the recombination sandwich layer can eliminate or alleviate the boundary effect of sandwich layer and inner cladding by a wide margin, improves the viscosity matching nature between sandwich layer, inner cladding and the both borders, reduces the optical fiber loss.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.
Claims (9)
1. An optical fiber preform characterized by: the optical fiber preform sequentially comprises an alkali metal-containing core layer, a fluorine-chlorine co-doped inner cladding layer, a trench layer, a middle cladding layer, an auxiliary middle cladding layer and a first outer cladding layer from inside to outside, and the alkali metal concentration is distributed in a gradient manner from inside to outside.
2. The waveguide fiber preform of claim 1 further comprising a second overcladding layer, the second overcladding layer being overcladded with the first overcladding layer, the second overcladding layer having a radius r7 of 62.5 μm, a refractive index △ n7 of 0.02% to 0.04%, and a viscosity of 5.5 x 107～6.8×107Pa·s。
3. The optical waveguide fiber preform of claim 1 wherein: the middle cladding and the auxiliary middle cladding are in step-type refractive index distribution or graded-type refractive index distribution.
4. The waveguide fiber preform of claim 1 wherein the radius r1 of the core layer is 3-7 μm, the refractive index △ n1 of the core layer is-0.05%, and the viscosity is 3.0 x 107～3.5×107Pa·s。
5. The waveguide fiber preform of claim 1 wherein the radius r2 of the inner cladding is 6-20 μm, the refractive index △ n2 of the inner cladding is-0.15% -0.25%, and the viscosity is 3.3 x 107～3.8×107Pa·s。
6. The preform of claim 1, wherein the radius r3 of the trench layer is 15-28 μm, the refractive index △ n3 of the trench layer is-0.3% -0.5%, and the viscosity is 3.0 x 107～3.6×107Pa·s。
7. The waveguide fiber preform of claim 1 wherein the radius r4 of the middle cladding is 25-33 μm, the refractive index △ n4 of the middle cladding is-0.15% -0.20%, and the viscosity is 3.8 x 107～4.4×107Pa·s。
8. The optical fiber preform of claim 1 wherein the optical fiber preform is a single-layer preformCharacterized in that the radius r5 of the auxiliary middle cladding is 35-45 μm, the refractive index △ n5 of the auxiliary middle cladding is-0.05% -0.1%, and the viscosity is 4.7 x 107～5.0×107Pa·s。
9. The waveguide fiber preform of claim 1 wherein the first overcladding has a radius r6 of 55 to 62.5 μm, a refractive index of △ n6 of 0%, and a viscosity of 5.1 x 107～5.2×107Pa·s。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111320376A (en) * | 2018-12-15 | 2020-06-23 | 中天科技精密材料有限公司 | Optical fiber preform and method for manufacturing the same |
| CN112649916A (en) * | 2020-12-25 | 2021-04-13 | 长飞光纤光缆股份有限公司 | Dispersion compensation optical fiber and module for miniaturized device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111320376A (en) * | 2018-12-15 | 2020-06-23 | 中天科技精密材料有限公司 | Optical fiber preform and method for manufacturing the same |
| CN111320376B (en) * | 2018-12-15 | 2023-09-12 | 中天科技精密材料有限公司 | Optical fiber preform and method for manufacturing the same |
| CN112649916A (en) * | 2020-12-25 | 2021-04-13 | 长飞光纤光缆股份有限公司 | Dispersion compensation optical fiber and module for miniaturized device |
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