CN107193082A - A kind of ultralow decay single-mode fiber - Google Patents
A kind of ultralow decay single-mode fiber Download PDFInfo
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- CN107193082A CN107193082A CN201710308060.3A CN201710308060A CN107193082A CN 107193082 A CN107193082 A CN 107193082A CN 201710308060 A CN201710308060 A CN 201710308060A CN 107193082 A CN107193082 A CN 107193082A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03633—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - -
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Abstract
The present invention relates to a kind of ultralow decay single-mode fiber, include sandwich layer and covering, it is characterized in that described core radius r1 is 3~5 μm, the relative index of refraction Δ n1 of sandwich layer is 0~0.20%, coat inner cladding outside sandwich layer successively from inside to outside, sink inner cladding and surrounding layer, described inner cladding diameter r2 is 6~10 μm, relative index of refraction Δ n2 is 0.23~0.45%, described sagging inner cladding diameter r3 is 10.5~20 μm, relative index of refraction Δ n3 is 0.40~0.65%, the surrounding layer is full fluorine doped silica glass layer, relative index of refraction Δ n4 is 0.25~0.53%.Manufacture craft of the present invention is relatively simple, distinctive viscosity matched design：Sandwich layer is non-pure silicon core, and the characteristics of being co-doped with germanium and fluorine while carrying out chlorine doping process, reduces the viscosity of optical fiber, accelerate the structural relaxation of glass；Matched by controlling doping concentration so as to optimize sandwich layer viscosity, optimization optical fiber various pieces viscosity and fiber stress realize the ultralow fade performance of single-mode fiber.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular to a kind of ultralow decay single-mode fiber.
Background technology
The focus of current optical fiber fabrication arts is to prepare ultralow decay single-mode fiber product, so finding a kind of effective side
Method reduces fiber attenuation coefficient, controls manufacturing cost, is all very huge challenge for fiber manufacturing enterprise.It is led
Difficulty is wanted to be following three points：First, how to reduce decay：Method main at present is to reduce the rayleigh scattering coefficient of optical fiber；
Second, being referred mainly to while ultralow attenuation coefficient is obtained, it is necessary to ensure that each optical parametric of optical fiber meets ITU-T standard
MFD, dispersion, cutoff wavelength and bending property control are in standard claimed range：Ensureing the same of the ultralow fade performance of optical fiber
When, other optical parametrics must be controlled in respective range；Third, optic fibre manufacture process is simply controllable, optical fiber is not dramatically increased
Manufacturing cost.
Difficult for three above, we are first for the decay for how reducing optical fiber.For silica fibre,
600nm-1600nm decay mostlys come from Rayleigh scattering, as the attenuation alpha caused by Rayleigh scatteringRIt can be calculated by following formula：
In formula, λ is wavelength (μm), and R is (dB/km/ μm of rayleigh scattering coefficient4)；P is light intensity；When rayleigh scattering coefficient is true
When recognizing, B is corresponding constant.As long as thus rayleigh scattering coefficient R, which is determined, just can obtain declining caused by Rayleigh scattering
Subtract αR(dB/km).It is on the other hand due to caused by fluctuation of concentration caused by density fluctuation that on the one hand Rayleigh scattering, which is due to,.
Thus rayleigh scattering coefficient R is represented by：
R=Rd+Rc
In above formula, RdAnd RcThe rayleigh scattering coefficient change caused by density fluctuation and fluctuation of concentration is represented respectively.Its
Middle RcFor the fluctuation of concentration factor, it is mainly influenceed by fiber glass part doping concentration, in theory using fewer Ge and F
Or other doping, RcSmaller, this is also that current external some enterprises are designed using pure silicon core, realizes the original of ultralow fade performance
Cause.
But we, which will be noted that, also includes another parameter R in rayleigh scattering coefficientd。RdWith the imagination temperature of glass
Spend TFCorrelation, and change with the structure change and temperature change of glass.The fictive temperature T of glassFIt is to characterize glass structure one
Individual physical parameter, is defined as no longer adjusting the structure that glass is quickly cooled to room temperature glass from certain temperature T ' and reaching certain and balance
The corresponding temperature of state.Work as T '>Tf (softening temperature of glass), because the viscosity of glass is smaller, glass structure is easy to adjustment, because
And poised state is in per glass in a flash, therefore TF=T '；Work as T '<Tg(transition temperature of glass), due to glass viscosity compared with
Greatly, glass structure is difficult to adjust, and the structural adjustment of glass lags behind temperature change, therefore TF>T’；Work as Tg<T’<Tf(the softening of glass
Temperature), the time required for glass is intended to balance is more shorter, specifically relevant with the component and cooling velocity of glass, therefore TF>
T ' or TF<T’。
Virtual temperature is in addition to the thermal history with fiber preparation has relation, and the component of fiber glass material is to virtual temperature
Degree has obvious and direct influence.Specifically, material component is to the viscosity of fiber glass material, thermal coefficient of expansion, cooling
The influence in the relaxation time of process, directly decides the virtual temperature of optical fiber.It should be noted that because ultralow attenuating fiber glass
Glass part is generally divided into several parts, such as typical sandwich layer, inner cladding and surrounding layer, or more complicated structure.So to multiple
The compositional difference of material needs reasonably to be matched between part：First ensures the optical waveguide of optical fiber, and second ensures glass
Under wire drawing stress obvious defect is not had into after optical fiber by wire drawing between each layer, cause optical fiber attenuation abnormal.
As described above, for optical fiber preparation technology, reduction fiber attenuation coefficient has three kinds of methods：The first is to try to subtract
The doping of few sandwich layer part, reduces the concentration factor of fiber Rayleigh scattering.Second is reduction drawing speed, increase optical fiber annealing
Process, it is ensured that preform slowly reduces temperature during wire drawing is into optical fiber, so that the virtual temperature of optical fiber is reduced,
Reduction decay.But this method significantly improves fiber manufacturing cost, and slow annealing process to the contribution of optical fiber attenuation also very
Thermal history restriction is prepared by fiber glass material component and prefabricated rods in big degree, so making to reduce decay in this way
Effect is limited.The third is the material component matching of reasonable design inside of optical fibre, i.e., need to be to fiber cores on the basis of few doping
The glass material of layer, inner cladding and other positions carries out rational proportioning and not only ensured in drawing process, each position of optical fiber
Rational optical cross-sectional matching is equipped with, also to ensure that there are rational viscosity, thermal expansion, Stress match in each position of optical fiber.At present
Primary fiber manufacturing enterprise, when manufacturing ultralow attenuating fiber, is more that notice is placed on into the first and the third method
On.
When manufacturing ultralow attenuating fiber using the third method in the industry at present, a kind of main method is set using pure silicon core
Meter.The design of pure silicon core refers to the doping for not having to carry out germanium or fluorine in sandwich layer.As described above, no germanium Fluorin doped can be effective
The concentration factor of optical fiber is reduced, fiber Rayleigh coefficient is advantageously reduced.But use the optics ripple of pure silicon core design also to optical fiber
Lead design and material profile design brings many challenges., must in order to ensure the total reflection of optical fiber when being designed using pure silicon core
The F doping inner claddings of relatively lower refractive rate must be used to be matched, to ensure to keep enough foldings between sandwich layer and inner cladding
Penetrate rate difference.But in this case, the sandwich layer of pure silicon core is if not done by rational design of material, and its viscosity will relatively
Height, and the inner cladding segment viscosity of a large amount of F doping is relatively low simultaneously, causes the matching of optical fiber structure viscosity unbalance, so that pure silicon core
The optical fiber virtual temperature of structure increases sharply, and causes the R of optical fiberdIncrease.Thus not only balance out RcThe benefit brought is reduced,
More likely cause optical fiber attenuation reversely abnormal.
From described above it will be appreciated that why theoretically, it is impossible to which simple utilization reduces sandwich layer doping and surpassed
Lower attenuation coefficient.In order to solve in this problem, document US20100195966A1 using the side for adding alkali metal in the core
Method, in the case where keeping fiber core layer pure silicon core, by the viscosity and core structure relaxation that change fiber core layer part
Time, to solve the R that viscosity mismatch is causeddIncrease, so that the rayleigh scattering coefficient of overall reduction optical fiber.Though but this kind of method
It can so effectively reduce optical fiber attenuation, but relative technique prepares complicated, it is necessary to point multiple batches of handled plug, and to alkali
Metal-doped concentration control requires high, is unfavorable for optical fiber and prepares on a large scale.
Document CN201310394404 proposes a kind of design of ultralow attenuating fiber, it uses the outsourcing of pure silicon dioxide
Layer design, but because it uses typical step cross-section structure, not using the curved of inner cladding design optimization optical fiber that sink
Song, and its sandwich layer does not use Ge to be doped, it is possible that cause prefabricated rods viscosity mismatch occur when preparing, it can be found that its
Decay and bent horizontal, it is relatively poor.
Document CN201510359450.4 proposes the ultralow attenuating fiber section and design of material of a kind of non-pure silicon core.Its
It is co-doped with matching the Fluorin doped glass of inner cladding using a small amount of germanium fluorine of sandwich layer, optimizes the component design of material, to a certain extent
Reduce the rayleigh scattering coefficient of optical fiber；Using relatively low sagging inner cladding and auxiliary inner wrap material, optical fiber is realized
Single mode transport；Sandwich layer be make use of with viscosity and thermal stress between optical fiber various pieces, the difference of the coefficient of expansion, realize compared with
Low density fluctuation, reduces the defect between interface.It should be noted that containing a certain amount of in the outsourcing layer of the design
Metal ion, so as to be integrally improved the viscosity of surrounding layer, reduce the refractive index of outsourcing layer, this has to a certain extent
Help realize the matched design of viscosity of material and stress, but also increase the density fluctuation coefficient of optical fiber integral material.We note
The Reduction Level anticipated to the design is all higher than 0.162dB/km, the concentration factor as caused by the germanium that can not solve sandwich layer is fluorin-doped
Increase and the viscosity for continuing reduction sandwich layer；And solve mismatch of the surrounding layer viscosity higher with auxiliary inner cladding viscosity, the program
It is difficult to continue to reduce the decay of optical fiber.
Document CN104991307A proposes a kind of fiber design, and it uses typical step cross-section structure, sandwich layer
Being co-doped with for germanium and fluorine is carried out, using the bending of sagging inner cladding design optimization optical fiber, surrounding layer uses pure silicon dioxide
Design.The cross-section structure is designed and manufacturing process is considerably complicated, more to optical fiber parameter influence factor, especially for optical fiber
Dispersion be relatively difficult to control to, and the optical fiber is not involved with abbe number and optical fiber micro-bending of the optical fiber in each wave band
Energy.Because it uses double surrounding layer concepts, the interface of packaging material and Fluorin doped surrounding layer outside pure silicon dioxide, in wire drawing or preparation
During, inevitable doped interface defect, it will the reduction of influence optical fiber attenuation performance.
The waveguide design of optical fiber can be effectively solved the problems, such as using the design of similar CN201510359450.4 optical cross-sectionals, but
It is how to continue to lower optical fiber attenuation as major issue.Briefly, if be co-doped with sandwich layer without using germanium fluorine, sandwich layer it is viscous
Spend significantly greater than inner cladding, the structural relaxation time τ of sandwich layercoreInner cladding structural relaxation time τ will be far longer thanclad, cause
In fiber drawing process, there is more defect, decay system in sandwich layer center stress mismatch, the interface between sandwich layer and inner cladding
Number increase.Without using the special outsourcing layer of metal impurities, although reduce the density factor of optical fiber, but also necessarily require
The viscosity of sandwich layer is reduced, accelerates the structural relaxation of sandwich layer, influence of the wire drawing stress to sandwich layer is reduced.
The content of the invention
It is below the definition of some terms being related in the present invention and explanation：
ppm：Millionth weight ratio；
Counted since fiber core axis, according to the change of refractive index, that layer being defined as near axis is light
Fine sandwich layer, the outermost layer of optical fiber is optical fiber jacket.
Relative index of refraction Δ ni：
Each layer relative index of refraction Δ n of optical fiberiDefined by below equation,
Wherein niFor the absolute index of refraction of optical fiber ad-hoc location, and ncFor the absolute index of refraction of pure silicon dioxide.
The relative index of refraction contribution amount Δ Ge of fiber core layer Ge doping is defined by below equation,
Wherein nGeTo assume the Ge dopants of fibre core, it is being doped in the pure silicon dioxide without other dopants, is causing
Absolute index of refraction obtained from the rise of silica glass refractive index, and ncFor without the pure silicon dioxide for carrying out Ge or F doping
Absolute index of refraction.
Cable cut-off wavelength λcc：
Defined in IEC (International Electrotechnical Commission) standard 60793-1-44：Cable cut-off wavelength λccIt is optical signal in optical fiber
In have propagated and not be re-used as the wavelength that single mode signal is propagated after 22 meters.Test when need to by optical fiber around a radius
14cm circle, two radius 4cm circle obtains data.
It is single that this technical problem to be solved is that the deficiency existed for above-mentioned prior art provides a kind of ultralow decay
Mode fiber, it not only technique it is relatively simple, and core covering design of material rationally, optical fiber various pieces viscosity matching optimization declines
Lower.
The technical scheme that the present invention is used by solution the problem of set forth above for：
Be related to a kind of ultralow decay single-mode fiber in the present invention, the glass part of optical fiber be made up of multi-component doped two
Silica glass is constituted, it is characterised in that the optical fiber includes following sections from inside to outside：Near cross section of optic fibre center
Position for sandwich layer；Be close to be looped around on the outside of sandwich layer for inner cladding；What inner cladding was wrapped around is by flourine deped silicon dioxide
The sagging inner cladding that glass is constituted；What sagging inner cladding was wrapped around is the surrounding layer of the silica glass composition of Fluorin doped.
The technical scheme that the present invention is used by solution the problem of set forth above for：Include sandwich layer and covering, its feature
It is 3~5 μm to be described core radius r1, the relative index of refraction Δ n1 of sandwich layer be outside 0~0.20%, sandwich layer from inside to outside according to
Secondary cladding inner cladding, sink inner cladding and surrounding layer, and described inner cladding diameter r2 is 6~10 μm, relative index of refraction Δ n2 for-
0.23~-0.45%, described sagging inner cladding diameter r3 are 10.5~20 μm, relative index of refraction Δ n3 is -0.40~-
0.65%, the surrounding layer is full fluorine doped silica glass layer, and relative index of refraction Δ n4 is -0.25~-0.53%.
By such scheme, described sandwich layer is the silica glass layer that germanium fluorine and chlorine are co-doped with, wherein the doping contribution of germanium
Measure as 0.03%~0.20%, chlorine doping 100~20000ppm by weight.
By such scheme, described chlorine doping 500~10000ppm by weight.
By such scheme, described sagging inner cladding is flourine deped silicon dioxide glassy layer.
By such scheme, described inner cladding relative index of refraction Δ n2 is more than surrounding layer relative index of refraction Δ n4, surrounding layer
Relative index of refraction Δ n4 is more than sink cladding relative refractive Δ n3, i.e. Δ n2>Δn4>Δn3.
By such scheme, mode field diameter of the optical fiber at 1310nm wavelength is 8.7~9.5 μm.
By such scheme, the cabled cutoff wavelength of the optical fiber is equal to or less than 1260nm.
By such scheme, the zero dispersion point of the optical fiber is 1300~1324nm.
By such scheme, attenuation coefficient of the optical fiber that the preform is prepared at 1550nm wavelength be less than or
Equal to 0.163dB/km, under optimum condition, less than or equal to 0.158dB/km.
By such scheme, the optical fiber is at wavelength 1625nm, and the macrobending loss that R15mm bend radius 10 is enclosed is equal to
Or less than 1.0dB, the macrobending loss that R10mm bend radius 1 is enclosed is equal to or less than under 1.5dB, optimum condition, and R15mm is curved
Bilge radius bending 10 circle macrobending losses be equal to or less than 0.1dB, R10mm bend radius 1 enclose macrobending loss be equal to or
Less than 0.2dB.
The mechanism of the present invention is：The chlorine doping of high concentration is carried out in sandwich layer part can realize similar to alkali metal ion
Modification to glass material.Adulterate the chlorion more than 5000ppm in fiber core layer position, can improve the refractive index of optical fiber,
The viscosity of optical fiber is reduced, accelerates the structural relaxation of glass.And concentration factor contribution of the chlorine ion concentration to optical fiber be not obvious, fits
When the chlorine doping content for improving sandwich layer, it is co-doped with, is matched by controlling doping concentration to optimize sandwich layer viscosity with reference to sandwich layer germanium fluorine.
The beneficial effects of the present invention are：1st, without using sandwich layer alkali metal material technique, technique controlling difficulty is reduced；2nd, it is special
Some viscosity matched designs：Sandwich layer is non-pure silicon core, the characteristics of being co-doped with germanium and fluorine, by controlling doping concentration so as to optimize
Sandwich layer viscosity is matched；Optimize optical fiber various pieces viscosity and fiber stress, realize the ultralow fade performance of single-mode fiber；3rd, sandwich layer
Chlorine doping process design is carried out, the viscosity of optical fiber is reduced, accelerates the structural relaxation of glass；4th, sandwich layer and inner cladding material are rationally designed
Material, reduces sandwich layer and inner cladding glass material the structural relaxation time mismatch in fiber preparation, reduces boundary defect；5th, exist
Sandwich layer and surrounding layer centre position, by sinking, surrounding layer is designed, and suppresses basic mode cut-off problem, improves fibre-optic waveguide transmission bar
Part；6th, using fluorine doped silica outsourcing Rotating fields, the material relaxation time of fiber optic materials various pieces is changed, so as to change light
Fine virtual temperature, and simplify fibre profile, realize the stability contorting of optical fiber parameter；7th, cutoff wavelength of the invention, mould field, decline
The comprehensive performance parameters such as consumption, dispersion are good in application band, meet G.652.B sonet standard, and damage with sufficiently small macrobend
Consumption, with ensure the type optical fiber in stranding, lay etc. under the conditions of caused by added losses it is sufficiently small.
Brief description of the drawings
Fig. 1 is the refractive index profile structural representation of one embodiment of the invention.
Embodiment
Below in conjunction with specific embodiment, the present invention will be described in detail.
Optical fiber includes sandwich layer, inner cladding from inside to outside, sink inner cladding and surrounding layer.Sandwich layer is two that germanium fluorine and chlorine are co-doped with
Silicon oxide glass layers；Inner cladding closely surrounds sandwich layer；Sagging inner cladding closely surrounds inner cladding, by fluorine doped silica quartz glass
Glass is constituted；Sink inner cladding outer wrap surrounding layer, and surrounding layer is full fluorine doped silica glass layer；Surrounding layer radius is 62.5 μ
m。
Optical fiber is formed by preform through Wire Drawing in embodiment, and prefabricated rods mainly include two parts：Fibre-optical mandrel
And the big sleeve pipe of the fluorine doped silica glass of hollow synthesis, fibre-optical mandrel and big sleeve pipe carry out being assembled into preform.
The plug of preform includes sandwich layer, inner cladding and sagging inner cladding, and preform outermost layer is by the fluorine doped dioxy that synthesizes
SiClx glass bushing is constituted.
Table 1 is classified as the refractive index profile parameter of the preferred embodiment of the invention, and Cl is the content of chlorine element in sandwich layer.Table
2 show the corresponding optical fiber parameter of the optical fiber.
The fibre profile parameter of table 1, the embodiment of the present invention
| Sequence number | Δ n1 [%] | Cl[ppm] | r1[μm] | Δ n2 [%] | r2[μm] | Δ n3 [%] | r3[μm] | Δ n4 [%] |
| 1 | 0.02 | 1300 | 3.6 | -0.26 | 7.8 | -0.49 | 11.8 | -0.27 |
| 2 | 0.01 | 18500 | 3.8 | -0.28 | 8.8 | -0.42 | 13.3 | -0.31 |
| 3 | 0.06 | 8600 | 3.7 | -0.32 | 8.4 | -0.45 | 14.1 | -0.40 |
| 4 | 0.04 | 15500 | 4.3 | -0.29 | 8.2 | -0.58 | 13.7 | -0.28 |
| 5 | 0.08 | 12600 | 4.0 | -0.26 | 9.1 | -0.42 | 15.6 | -0.35 |
| 6 | 0.11 | 6200 | 3.6 | -0.24 | 8.0 | -0.56 | 12.5 | -0.28 |
| 7 | 0.09 | 3500 | 4.1 | -0.37 | 9.9 | -0.47 | 14.6 | -0.42 |
| 8 | 0.03 | 6100 | 4.3 | -0.41 | 9.0 | -0.50 | 13.8 | -0.52 |
| 9 | 0.05 | 13900 | 3.7 | -0.45 | 8.5 | -0.59 | 12.9 | -0.49 |
| 10 | 0.07 | 5490 | 4.4 | -0.33 | 9.6 | -0.52 | 12.2 | -0.37 |
The optical fiber parameter of table 2, the embodiment of the present invention
Claims (9)
1. a kind of ultralow decay single-mode fiber, includes sandwich layer and covering, it is characterised in that described core radius r1 is 3~5 μ
M, the relative index of refraction Δ n1 of sandwich layer are to coat inner cladding successively from inside to outside outside 0~0.20%, sandwich layer, and sink inner cladding and outer
Covering, described inner cladding diameter r2 is 6~10 μm, and relative index of refraction Δ n2 is -0.23~-0.45%, and described sinking is interior
Cladding radius r3 is 10.5~20 μm, and relative index of refraction Δ n3 is -0.40~-0.65%, and the surrounding layer is full fluorine doped dioxy
SiClx glassy layer, relative index of refraction Δ n4 is -0.25~-0.53%.
2. the ultralow decay single-mode fiber as described in claim 1, it is characterised in that described sandwich layer is that germanium fluorine and chlorine are co-doped with
The doping contribution amount of silica glass layer, wherein germanium is 0.03%~0.20%, chlorine doping by weight 100~
20000ppm。
3. the ultralow decay single-mode fiber as described in claim 2, it is characterised in that described chlorine doping by weight 500
~10000ppm.
4. the ultralow decay single-mode fiber as described in claim 1 or 2, it is characterised in that described sagging inner cladding is Fluorin doped
Silica glass layer.
5. the ultralow decay single-mode fiber as described in claim 1 or 2, it is characterised in that described inner cladding relative index of refraction Δ
N2 is more than surrounding layer relative index of refraction Δ n4, and surrounding layer relative index of refraction Δ n4 is more than the cladding relative refractive Δ n3 that sink, i.e.,
Δn2>Δn4>Δn3。
6. the ultralow decay single-mode fiber as described in claim 1 or 2, it is characterised in that the optical fiber is at 1310nm wavelength
Mode field diameter is 8.7~9.5 μm.
7. the ultralow decay single-mode fiber as described in claim 1 or 2, it is characterised in that cabled cutoff wavelength of the optical fiber etc.
In or less than 1260nm；The zero dispersion point of the optical fiber is 1300~1324nm.
8. the ultralow decay single-mode fiber as described in claim 1 or 2, it is characterised in that the optical fiber is at 1550nm wavelength
Attenuation coefficient is less than or equal to 0.163dB/km.
9. the ultralow decay single-mode fiber as described in claim 1 or 2, it is characterised in that the optical fiber at wavelength 1625nm,
The macrobending loss that R15mm bend radius 10 is enclosed is equal to or less than 1.0dB, the macrobending loss that R10mm bend radius 1 is enclosed
Equal to or less than 1.5dB.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109445023A (en) * | 2018-11-07 | 2019-03-08 | 长飞光纤光缆股份有限公司 | Doping-optimized ultra-low attenuation single-mode fiber |
| CN110446957A (en) * | 2017-03-22 | 2019-11-12 | 株式会社藤仓 | Polarization maintaining optical fibre, optical device, the base material of polarization maintaining optical fibre and manufacturing method |
| CN110954985A (en) * | 2019-12-26 | 2020-04-03 | 长飞光纤光缆股份有限公司 | Ultralow-attenuation large-effective-area single-mode fiber |
| CN112441737A (en) * | 2019-08-30 | 2021-03-05 | 中天科技精密材料有限公司 | Preparation method of optical fiber and powder rod sintering equipment |
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