CN106997073A - A kind of ultralow attenuation large effective area single-mode fiber - Google Patents
A kind of ultralow attenuation large effective area single-mode fiber Download PDFInfo
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- CN106997073A CN106997073A CN201710307796.9A CN201710307796A CN106997073A CN 106997073 A CN106997073 A CN 106997073A CN 201710307796 A CN201710307796 A CN 201710307796A CN 106997073 A CN106997073 A CN 106997073A
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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
- G02B6/03638—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 3 layers only
- G02B6/0365—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 3 layers only arranged - - +
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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
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
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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
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
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Abstract
The present invention relates to a kind of ultralow attenuation large effective area single-mode fiber, include sandwich layer and covering, it is characterized in that described core radius r1 is 5~8 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 8.5~12 μm, relative index of refraction Δ n2 is 0.20~0.45%, described sagging inner cladding diameter r3 is 12.5~30 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 0.22~0.53%.The distinctive viscosity matched design of the present invention：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 optical communication field, and in particular to a kind of ultralow attenuation large effective area single-mode fiber.
Background technology
Current optical fiber fabrication arts focus is to prepare the ultralow new single-mode fiber product of decay, so finding a kind of effective
Method reduction fiber attenuation coefficient, control manufacturing cost, be all very huge challenge for fiber manufacturing enterprise.
Its main difficulty is following three points：First, how to reduce decay：Method main at present is to reduce the Rayleigh scattering system of optical fiber
Number；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.
It is difficult for three above, first for the decay for how reducing optical fiber.For silica fibre, in 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 the reason for the realizing ultralow fade performance using the design of pure silicon core.
It should be noted that arriving, another parameter R is also included in rayleigh scattering coefficientd。RdWith the fictive temperature T of glassF
Correlation, and change with the structure change and temperature change of glass.The fictive temperature T of glassFIt is to characterize glass structure one
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 equilibrium-like
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, thus
It is in poised state 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
It is more that notice is placed in the first and three kinds of methods when manufacturing ultralow attenuating fiber.
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 defined as 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 outermost cladding index, i.e., do not carry out Ge or F
The absolute index of refraction of the pure silicon dioxide of doping.
The effective area A of optical fibereff：
Wherein, E is the electric field relevant with propagation, and R is the distance between axle center to Electric Field Distribution point.
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.
The technical problems to be solved by the invention are that the not enough offer one kind for being directed to the presence of above-mentioned prior art is ultralow and declined
Subtract large-effective area single mode fiber, its core covering sets reasonable, and viscosity matching is excellent, decays low.
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 5~8 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, sagging inner cladding and surrounding layer, described inner cladding diameter r2 is 8.5~12 μm, relative index of refraction Δ n2
For -0.20~-0.45%, described sagging inner cladding diameter r3 is 12.5~30 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 -0.22~-0.53%.
By such scheme, described sandwich layer is the silica glass layer that germanium fluorine and chlorine are co-doped with, or germanium be co-doped with chlorine two
The doping contribution amount of silicon oxide glass layers, wherein germanium is 0.04%~0.08%, chlorine doping by weight 100~
20000ppm。
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, effective area of the optical fiber at 1550nm wavelength is 100~135 μm2。
By such scheme, attenuation coefficient of the optical fiber at 1550nm wavelength is less than or equal to 0.160dB/km, preferably
Under the conditions of, less than or equal to 0.156dB/km.
By such scheme, the cabled cutoff wavelength of the optical fiber is equal to or less than 1530nm.
By such scheme, the zero dispersion point of the optical fiber is less than or equal to 1300nm.
By such scheme, dispersion of the optical fiber at wavelength 1550nm is equal to or less than 23ps/nm*km, the optical fiber
Dispersion at wavelength 1625nm is equal to or less than 27ps/nm*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 0.1dB, the macrobending loss that R10mm bend radius 1 is enclosed is 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, distinctive viscosity matched design：Sandwich layer is non-pure silicon core, common with germanium and fluorine
The characteristics of mixing, is matched by controlling doping concentration so as to optimize sandwich layer viscosity；Optimize optical fiber various pieces viscosity and fiber stress,
Realize the ultralow fade performance of single-mode fiber；2nd, sandwich layer carries out chlorine doping process design, reduces the viscosity of optical fiber, accelerates glass
Structural relaxation；3rd, sandwich layer and inner wrap material are rationally designed, reduction sandwich layer and inner cladding glass material are in fiber preparation
Structural relaxation time mismatch, reduces boundary defect；4th, in sandwich layer and surrounding layer centre position, by sinking, surrounding layer is designed, suppression
Basic mode processed ends problem, improves fibre-optic waveguide transmission conditions；5th, using fluorine doped silica outsourcing Rotating fields, fiber optic materials are changed
In the material relaxation time of various pieces, so as to change the virtual temperature of optical fiber, and simplify fibre profile, realize the steady of optical fiber parameter
Fixed control；6th, the comprehensive performance parameter such as cutoff wavelength, mould field, attenuation, dispersion of the invention is good in application band, meets
G.654.D sonet standard, and with sufficiently small macrobending loss, with ensure the type optical fiber in stranding, lay etc. under the conditions of cause
Added losses it is sufficiently small.
Brief description of the drawings
Fig. 1 is the cross-sectional view 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, or the silica glass layer that germanium is co-doped with chlorine；Inner cladding closely surrounds sandwich layer；Sagging inner cladding closely encloses
Around inner cladding, it is made up of fluorine doped silica quartz glass；Sink inner cladding outer wrap surrounding layer, and surrounding layer is full fluorine doped dioxy
SiClx glassy layer；Surrounding layer radius is 62.5 μm.
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 | 400 | 5.0 | -0.24 | 9.5 | -0.64 | 13.6 | -0.27 |
| 2 | 0.03 | 9800 | 5.4 | -0.26 | 9.8 | -0.61 | 14.0 | -0.29 |
| 3 | 0.05 | 12500 | 5.8 | -0.30 | 8.6 | -0.55 | 14.7 | -0.42 |
| 4 | 0.06 | 10700 | 6.0 | -0.28 | 9.0 | -0.58 | 15.0 | -0.39 |
| 5 | 0.07 | 1700 | 5.7 | -0.29 | 10.2 | -0.53 | 16.3 | -0.31 |
| 6 | 0.10 | 8400 | 7.5 | -0.26 | 9.5 | -0.47 | 17.5 | -0.36 |
| 7 | 0.07 | 3200 | 6.4 | -0.39 | 11.3 | -0.50 | 15.9 | -0.48 |
| 8 | 0.06 | 196000 | 7.3 | -0.42 | 9.7 | -0.45 | 18.3 | -0.50 |
| 9 | 0.05 | 4500 | 6.8 | -0.43 | 10.6 | -0.48 | 16.7 | -0.46 |
| 10 | 0.08 | 15100 | 7.2 | -0.33 | 11.7 | -0.41 | 19.1 | -0.34 |
The optical fiber parameter of table 2, the embodiment of the present invention
Claims (10)
1. a kind of ultralow attenuation large effective area single-mode fiber, includes sandwich layer and covering, it is characterised in that described sandwich layer half
Footpath r1 is 5~8 μm, the relative index of refraction Δ n1 of sandwich layer be outside 0~0.20%, sandwich layer from inside to outside successively cladding inner cladding, under
Inner cladding and surrounding layer being fallen into, described inner cladding diameter r2 is 8.5~12 μm, relative index of refraction Δ n2 is -0.20~-
0.45%, described sagging inner cladding diameter r3 is 12.5~30 μm, and relative index of refraction Δ n3 is -0.40~-0.65%, described
Surrounding layer is full fluorine doped silica glass layer, and relative index of refraction Δ n4 is -0.22~-0.53%.
2. the ultralow attenuation large effective area single-mode fiber as described in claim 1, it is characterised in that described sandwich layer is germanium fluorine
And the silica glass layer that chlorine is co-doped with, or the silica glass layer that germanium and chlorine are co-doped with, the doping contribution amount of wherein germanium is
0.04%~0.08%, chlorine doping 100~20000ppm by weight.
3. the ultralow attenuation large effective area single-mode fiber as described in claim 2, it is characterised in that described chlorine doping is pressed
Weight is calculated as 500~10000ppm.
4. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that described interior wrap of sinking
Layer is flourine deped silicon dioxide glassy layer.
5. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that described inner cladding phase
Refractive index 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 covering relative that sink
Rate Δ n3, i.e. Δ n2>Δn4>Δn3.
6. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that the optical fiber exists
Effective area at 1550nm wavelength is 100~135 μm2。
7. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that the optical fiber exists
Attenuation coefficient at 1550nm wavelength is less than or equal to 0.160dB/km.
8. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that the stranding of the optical fiber
Cutoff wavelength is equal to or less than 1530nm.
9. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that zero color of the optical fiber
Scatterplot is less than or equal to 1300nm；Dispersion of the optical fiber at wavelength 1550nm is equal to or less than 23ps/nm*km, the optical fiber
Dispersion at wavelength 1625nm is equal to or less than 27ps/nm*km.
10. the ultralow attenuation large effective area single-mode fiber as described in claim 1 or 2, it is characterised in that the optical fiber is in ripple
At long 1625nm, the macrobending loss that R15mm bend radius 10 is enclosed is equal to or less than 0.1dB, R10mm bend radius 1
The macrobending loss of circle is equal to or less than 0.2dB.
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| CN107490819A (en) * | 2017-08-22 | 2017-12-19 | 长飞光纤光缆股份有限公司 | Single-mode fiber with ultralow attenuation large effective area |
| 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 |
| 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 |
| 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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| CN107490819A (en) * | 2017-08-22 | 2017-12-19 | 长飞光纤光缆股份有限公司 | Single-mode fiber with ultralow attenuation large effective area |
| 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 |
| CN109445023B (en) * | 2018-11-07 | 2020-06-16 | 长飞光纤光缆股份有限公司 | Doping-optimized ultra-low attenuation single-mode fiber |
| 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 |
| 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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