CN107608023A - A kind of ultralow decay less fundamental mode optical fibre of step change type - Google Patents
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Abstract
The present invention relates to a kind of ultralow decay less fundamental mode optical fibre of step change type, include sandwich layer and covering, core radius r1 is 5~8 μm, refractive index contrast Δ n1 is 0~0.20%, inner cladding is coated successively from inside to outside outside sandwich layer, sink inner cladding, aid in surrounding layer and surrounding layer, inner cladding diameter r2 is 8.5~14 μm, refractive index contrast Δ n2 is 0.45~0.23%, the inner cladding diameter r3 that sink is 14.5~30 μm, refractive index contrast Δ n3 is 0.65~0.40%, it is 35~50 μm to aid in surrounding layer radius r4, refractive index contrast Δ n4 is 0.45~0.23%, surrounding layer is pure silicon dioxide glassy layer.The less fundamental mode optical fibre of the present invention supports two stable transmission modes to be respectively provided with ultralow decay in 1550nm communication bands, pass through the rational design to each core layer section of optical fiber, make optical fiber that there is relatively low differential mode group delay and excellent bending resistance, and have large effective area.
Description
Technical field
The present invention relates to a kind of ultralow decay less fundamental mode optical fibre of step change type, and system is transmitted suitable for the mode division multiplexing of fiber optic communication
System, it supports two stable transmission modes in 1550nm communication bands.
Background technology
For single-mode fiber because its transmission rate is fast, it is big to carry information capacity, the advantages that long transmission distance, is widely used
Among Networks of Fiber Communications.And in recent years, as communication and big data business are growing day by day to the demand of capacity, network bandwidth
Rapid Expansion, the capacity of optical transport network is just progressively close to the shannon limit of simple optical fiber：100Tb/s.Space division multiplexing and mould point
The shannon limit that multiplexing technology can break traditions, the transmission of more high bandwidth is realized, be solve the problems, such as transmission capacity preferably square
Method.Support the optical fiber i.e. multi-core fiber and less fundamental mode optical fibre of this multiplexing technology.
Experiment shows, letter can be transmitted under more than one space-propagation mode using less fundamental mode optical fibre combination MIMO technology
Number.And MIMO technology can compensate for intercoupling between pattern, separate each spatial model in receiving terminal.Fluctuating
In optics, according to the pattern theory of step index fiber, the radius size and the direct shadow of index distribution size of sandwich layer and covering
The linearly polarized mode transmission mode number in optical fiber is rung, this characteristic can be quantified with normalized frequency V：
Wherein a1It is core radius, n1It is core refractive rate, n2It is cladding index.When fibre-optic waveguide design meets normalized frequency V ＜
During 2.405 condition, linearly polarized mode LP01 (namely HE11 moulds) is only supported, is exactly the Standard single-mode fiber that we frequently refer to；
Once the order transmission mould HOM of more than one occurs in transmission mode in the optical fiber of V ＞ 2.405.Because we pass through to section knot
Structure is designed and (changes a1, the value of the grade of △ 1, △ 2) value so as to suitable control normalized frequency in certain limit, Ke Yishe
Count out support and specify number a less fundamental mode optical fibre for pattern transmission.Such as, as 2.405 ＜ V ＜ 3.8, support 2 LP patterns (LP01,
LP11)；3.8 ＜ V ＜ 5.1, then support 4 LP patterns (LP01, LP11, LP21, LP02).
United States Patent (USP) US8948559, US8848285, US8837892, US8705922 and Chinese patent
CN104067152, CN103946729 etc. propose the less fundamental mode optical fibre of parabolic type or step type profile, but each of which is present
Advantage and disadvantage.Less fundamental mode optical fibre manufacturing process with step type profile is simple, it is easy to accomplish produce in enormous quantities, but its generally have compared with
Big DGD, even as high as thousands of ps/km【S.Matsuo,Y.Sasaki,I.Ishida,K.Takenaga,et al.,
“Recent Progress on Multi-Core Fiber and Few-Mode Fiber”OFC 2013,OM3I.3
(2013)】.The less fundamental mode optical fibre of parabolic profile has more customized parameters so that intermode crosstalk and DGD reach very
Low level, but its preparation technology is complicated, and alpha parameters are difficult to accurately equably control, and repeatability is not high.And refractive index is cutd open
Face is along the minor fluctuations on prefabricated rods axial direction with regard to that can cause the significant change of DGD at optical fiber difference segment length.In order to overcome above-mentioned ask
, it is necessary to invent a kind of less fundamental mode optical fibre, it has less DGD and can carry out repeated preparation by simple technique topic.
On the other hand, with the further development of Optical Amplification Technology, optical fiber telecommunications system just towards more large transmission power and
The direction of more longer transmission distance is developed.It is also necessary as the important transmission medium in optical fiber telecommunications system, the correlated performance of optical fiber
There is further lifting, to meet the needs of optical fiber telecommunications system practical development.Decay and mode field diameter are the two of single-mode fiber
Individual important performance indications.The decay of optical fiber is smaller, and transmission range of the optical signal in this medium is longer, optical communication system
Non-relay distance is also longer, so as to substantially reduce relay station quantity, to build while reliability of communication system is improved
It is greatly reduced with maintenance cost；The mode field diameter of optical fiber is bigger, and effective area is bigger, then its nonlinear effect is weaker.Greatly
Effective area can effectively suppress the nonlinear effects such as Self-phase modulation, four-wave mixing, Cross-phase Modulation, ensure high power
The transmission quality of optical signal.Reduction decay and increase effective area can effectively improve the light noise in optical fiber telecommunications system
Than the further transmission range and transmission quality for improving system.
For silica fibre, Rayleigh scattering is mostly come from 600nm-1600nm decay, as caused by Rayleigh scattering
Attenuation alphaRIt 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 it is determined that rayleigh scattering coefficient R just can obtain declining caused by Rayleigh scattering
Subtract αR(dB/km).On the one hand Rayleigh scattering is due to caused by density fluctuation, be on the other hand due to caused by fluctuation of concentration.
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, uses fewer Ge and F in theory
Or other doping, RcSmaller, this is also to be designed using pure silicon core, the reason for realizing ultralow fade performance.
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 structure change and the temperature change of glass.The fictive temperature T of glassFIt is to characterize glass structure one
Physical parameter, the structure for being defined as being quickly cooled to glass from certain temperature T ' room temperature glass no longer adjust and reach certain equilibrium-like
Temperature corresponding to state.Work as T '>Tf(softening temperature of glass), because the viscosity of glass is smaller, glass structure is easy to adjust, 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), glass is intended to balance that the required time 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 decide 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
The defects of obvious, is not had between each layer into after optical fiber by wire drawing under wire drawing stress, causes optical fiber attenuation abnormal.
As described above, for optical fiber preparation technology, reducing fiber attenuation coefficient has three kinds of methods：The first is to try to subtract
The doping of few sandwich layer part, reduce the concentration factor of fiber Rayleigh scattering.Second is to reduce drawing speed, increase optical fiber annealing
Process, ensure that preform during wire drawing is into optical fiber, slowly reduces temperature, so as to reduce the virtual temperature of optical fiber,
Reduce decay.But this method significantly improves fiber manufacturing cost, and slowly contribution of the annealing process to optical fiber attenuation be also very
Thermal history is prepared in big degree by fiber glass material component and prefabricated rods to restrict, so making to reduce decay in this way
Effect is limited.The third is the material component matching for rationally designing 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 do not have the doping for carrying 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, advantageously reduces fiber Rayleigh coefficient.But use the pure silicon core design also optics ripple 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 will relatively if not done by rational design of material, its viscosity
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 utilize reduces sandwich layer doping merely is surpassed
Lower attenuation coefficient.In order to solve this problem, the side for adding alkali metal in the core is used in document US20100195966A1
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, come R caused by solving viscosity mismatchdIncrease, so as to the overall rayleigh scattering coefficient for reducing 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 ultralow the 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, the defects of reducing 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, can not such as solve the fluorin-doped caused concentration factor of germanium of sandwich layer
Increase and continue the viscosity of 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.
The content of the invention
It is definition and the explanation for some terms being related in the present invention below：
Prefabricated rods：The radial refractive index distribution being made up of sandwich layer and covering meets fiber design requirement and can be directly drawn into
It is designed
The glass bar or assembly of optical fiber；
Plug：Solid glass prefabricated component containing sandwich layer and part of clad；
Radius：The distance between this layer of external boundary and central point；
Refractive index profile：Relation between optical fiber or preform (including plug) glass refraction and its radius；
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 are 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 to without in the pure silicon dioxide of other dopants, is causing
Absolute index of refraction obtained from the rise of silica glass refractive index, and ncIt is for outermost cladding index, i.e., no to carry out Ge or F
The absolute index of refraction of the pure silicon dioxide of doping.
OVD techniques：The quartz glass of thickness needed for Outside Vapor deposition and sintering process preparation；
VAD techniques：The quartz glass of thickness needed for axial vapor deposition and sintering process preparation；
APVD over cladding process：Natural or synthetic silica flour is founded in needed for mandrel surface preparation with high-frequency plasma flame
The SiO of thickness2Glass；
Bare fibre：Refer to the glass fiber that coat is free of in optical fiber.
The technical problems to be solved by the invention are providing a kind of be applicable for above-mentioned the shortcomings of the prior art
In the ultralow decay less fundamental mode optical fibre of the step change type of mode division multiplexing technology, it can stablize at 1550nm and transmit 2 linear polarization patterns, both have
There is less DGD, also with ultralow decay and larger effective area, and manufacture craft is easy.
The present invention is to solve the problems, such as that used technical scheme set forth above is：Include sandwich layer and covering, its feature
It is 5~8 μm to be described core radius r1, and refractive index contrast Δ n1 is 0~0.20%, is wrapped successively from inside to outside outside sandwich layer
Inner cladding, the inner cladding that sink, auxiliary surrounding layer and surrounding layer are covered, described inner cladding diameter r2 is 8.5~14 μm, relative
Rate difference Δ n2 is -0.45~-0.23%, and described sagging inner cladding diameter r3 is 14.5~30 μm, refractive index contrast Δ n3
For -0.65~-0.40%, described auxiliary surrounding layer radius r4 is 35~50 μm, refractive index contrast Δ n4 is -0.45~-
0.23%, described surrounding layer radius r5 are 62~63 μm, and surrounding layer is pure silicon dioxide glassy layer.
By such scheme, described sandwich layer is the silica glass layer that is co-doped with of germanium fluorine and alkali metal, or germanium and alkali metal
The doping contribution amount of the silica glass layer being co-doped with, wherein germanium is 0.04%~0.08%, and the doping of alkali metal is by weight
It is calculated as 5~3000ppm.
By such scheme, the element that alkali metal is mixed in the sandwich layer is the one or more in lithium, sodium, potassium, rubidium, francium.
By such scheme, described sagging inner cladding is flourine deped silicon dioxide glassy layer.
By such scheme, described inner cladding refractive index contrast Δ n2 is more than auxiliary surrounding layer refractive index contrast Δ
N4, auxiliary surrounding layer refractive index contrast Δ n4 are more than sink cladding relative refractive difference Δ n3, i.e. Δ n2>Δn4>Δn3.
By such scheme, the optical fiber supports two stable transmission modes at 1550nm wavelength, be respectively LP01 and
LP11。
By such scheme, the attenuation coefficient of two patterns of the optical fiber at 1550nm wavelength is respectively less than or is equal to
0.160dB/km, it is less than or equal to 0.158dB/km under optimum condition.
By such scheme, the maximum of DGD (differential mode group delay) of the optical fiber at 1550nm wavelength absolute value
Less than or equal to 4ps/m, it is less than or equal to 3ps/m under optimum condition.
By such scheme, the effective area of described LP01 transmission modes optical fiber at 1550nm wavelength is 120~170 μ
m2；Dispersion values at 1550nm wavelength are less than or equal to 22ps/ (nm*km)；Described LP11 transmission modes are in 1550nm ripples
The effective area of strong point optical fiber is 150~210 μm2；Dispersion values at 1550nm wavelength are less than or equal to 24ps/ (nm*km).
By such scheme, the outer coated with resins dope layer of the optical fiber, include interior coat and outer coat, described is interior
Coat external diameter is 150~220 μm, and the Young's modulus of interior coat is 0.2~0.5MPa, and outer coat external diameter is equal to or more than
230μm。
By such scheme, microbending loss of the optical fiber at 1700nm wavelength is less than or equal to 4dB/km, optimum condition
Under, less than or equal to 2dB/km.
The beneficial effects of the present invention are：1st, two patterns of less fundamental mode optical fibre prepared by the present invention are respectively provided with ultralow decline
Subtract, so as in primary transmission, reduce the cost for building associated base stations and other system equipments.Fade performance depend on
The factor of lower many aspects：Firstth, distinctive viscosity matched design：Sandwich layer is non-pure silicon core, has the characteristics of germanium and fluorine are co-doped with,
Matched by controlling doping concentration so as to optimize sandwich layer viscosity；Optimize optical fiber various pieces viscosity and fiber stress, realize few mould
The ultralow fade performance of optical fiber；Secondth, sandwich layer carries out alkali-metal-doped technological design, effectively reduces sandwich layer virtual temperature；3rd,
Sandwich layer and inner wrap material are rationally designed, reduces sandwich layer and inner cladding glass material the structural relaxation time in fiber preparation
Mismatch, reduce boundary defect；4th, in sandwich layer and surrounding layer centre position, by sinking, surrounding layer designs, and suppresses basic mode cut-off
Problem, improve fibre-optic waveguide transmission conditions；5th, drawing optical fibers tension force is undertaken using pure silicon dioxide outsourcing Rotating fields, reduced
Interface location defect caused by stress；2nd, by the rational design to each core layer section of optical fiber, and sagging covering is set
Put, not only make optical fiber that there is relatively low differential mode group delay (DGD), and possess excellent bending resistance；3rd, it is prepared
Optical fiber, which has, is equal to or more than 120 μm2Effective area, this relative to the larger effective area of single-mode fiber contribute to reduce light
Fine nonlinear effect.4th, optical fiber of the invention goes for weak coupling mode division multiplexing system, while transmission capacity is increased,
The complexity of system output will not be increased considerably.
Brief description of the drawings
Fig. 1 is the refractive index profile schematic diagram of one embodiment of the invention.
Fig. 2 is the pattern distribution map of less fundamental mode optical fibre prepared by the present invention.
Embodiment
With reference to embodiment, the present invention is described in further detail.
The less fundamental mode optical fibre of the present invention includes sandwich layer and covering, and described core radius is r1, and refractive index contrast is Δ
N1, sandwich layer coat inner cladding, the inner cladding that sink, auxiliary surrounding layer and surrounding layer, described inner cladding half successively from inside to outside outside
Footpath is r2, and refractive index contrast is Δ n2, and described sagging inner cladding diameter is r3, and refractive index contrast is Δ n3, described
Auxiliary surrounding layer radius is r4, and refractive index contrast is Δ n4, and described surrounding layer radius r5 is 62.5 μm, and surrounding layer is pure two
Silicon oxide glass layers.
According to the technical scheme of above-mentioned less fundamental mode optical fibre, the parameter of optical fiber is designed in the range of its defined, and
Design requirement by plug manufacturing process such as known PCVD techniques, MCVD techniques, OVD techniques or VAD techniques according to optical fiber
Plug is manufactured, the manufacture of whole prefabricated rods is completed by over cladding process such as sleeve pipe technique, OVD techniques or VAD techniques.
The refractive index profile of institute's drawing optical fiber is tested using NR-9200 equipment (EXFO), the refractive index profile of optical fiber
And the major parameter of dopant material is as shown in table 1.
The Specifeca tion speeification of institute's drawing optical fiber is as shown in table 2.
As shown by data, according to the optical fiber manufactured by technical scheme, it supports two surely at 1550nm wavelength
Fixed transmission mode, it is LP01 and LP11 respectively.Attenuation coefficient of two patterns at 1550nm wavelength is respectively less than or is equal to
0.160dB/km, it is less than or equal to 0.158dB/km under optimum condition.DGD of the less fundamental mode optical fibre at 1550nm absolute value
Maximum is less than or equal to 4ps/m, is less than or equal to 3ps/m under optimum condition.Wherein, LP01 patterns are at 1550nm wavelength
Effective area is more than 120 μm2；Dispersion values at 1550nm are less than 22ps/ (nm*km).
The less fundamental mode optical fibre sectional parameter of table 1, the embodiment of the present invention
The Specifeca tion speeification of table 2, less fundamental mode optical fibre of the embodiment of the present invention
Claims (10)
1. a kind of ultralow decay less fundamental mode optical fibre of step change type, includes sandwich layer and covering, it is characterised in that described core radius r1
For 5~8 μm, refractive index contrast Δ n1 is 0~0.20%, coated successively from inside to outside outside sandwich layer inner cladding, the inner cladding that sink,
Surrounding layer and surrounding layer are aided in, described inner cladding diameter r2 is 8.5~14 μm, refractive index contrast Δ n2 is -0.45~-
0.23%, described sagging inner cladding diameter r3 are 14.5~30 μm, and refractive index contrast Δ n3 is -0.65~-0.40%, institute
The auxiliary surrounding layer radius r4 stated is 35~50 μm, and refractive index contrast Δ n4 is -0.45~-0.23%, described surrounding layer
Radius r5 is 62~63 μm, and surrounding layer is pure silicon dioxide glassy layer.
2. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 1, it is characterised in that described sandwich layer is germanium fluorine and alkali
The silica glass layer that metal is co-doped with, or the doping contribution amount of silica glass layer, wherein germanium that germanium and alkali metal are co-doped with
For 0.04%~0.08%, doping 5~3000ppm by weight of alkali metal.
3. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 3, it is characterised in that mix alkali metal in the sandwich layer
Element be lithium, sodium, potassium, rubidium, the one or more in francium.
4. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 1 or 2, it is characterised in that described sagging inner cladding is
Flourine deped silicon dioxide glassy layer.
5. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 1 or 2, it is characterised in that described inner cladding is relative to be rolled over
Penetrate rate difference Δ n2 and be more than auxiliary surrounding layer refractive index contrast Δ n4, auxiliary surrounding layer refractive index contrast Δ n4 is more than the bag that sink
Layer refractive index contrast Δ n3, i.e. Δ n2>Δn4>Δn3.
6. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 1 or 2, it is characterised in that the optical fiber is in 1550nm ripples
Strong point supports two stable transmission modes, is LP01 and LP11 respectively.
7. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 6, it is characterised in that two transmission moulds of the optical fiber
Attenuation coefficient of the formula at 1550nm wavelength is respectively less than or equal to 0.160dB/km.
8. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 1 or 2, it is characterised in that the optical fiber is in 1550nm ripples
The maximum of the DGD of strong point absolute value is less than or equal to 4ps/m.
9. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 6, it is characterised in that described LP01 transmission modes exist
The effective area of optical fiber is 120~170 μm at 1550nm wavelength2, the dispersion values at 1550nm wavelength are less than or equal to 22ps/
(nm*km)；The effective area of described LP11 transmission modes optical fiber at 1550nm wavelength is 150~210 μm2, in 1550nm
Dispersion values at wavelength are less than or equal to 24ps/ (nm*km).
10. the ultralow decay less fundamental mode optical fibre of step change type as described in claim 1 or 2, it is characterised in that the optical fiber is in 1700nm
Microbending loss at wavelength is less than or equal to 4dB/km.
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Cited By (5)
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| CN108333674A (en) * | 2018-02-13 | 2018-07-27 | 长飞光纤光缆股份有限公司 | A kind of six mode fibers of ultralow decaying of step change type |
| CN108363141A (en) * | 2018-02-13 | 2018-08-03 | 长飞光纤光缆股份有限公司 | A kind of four mode fibers of ultralow decaying of step change type |
| CN108363139A (en) * | 2018-02-13 | 2018-08-03 | 长飞光纤光缆股份有限公司 | A kind of two mode fibers of ultralow decaying of step change type |
| CN108363138A (en) * | 2018-02-09 | 2018-08-03 | 长飞光纤光缆股份有限公司 | A kind of four mode fibers of ultralow decaying of gradation type |
| CN108415120A (en) * | 2018-02-09 | 2018-08-17 | 长飞光纤光缆股份有限公司 | A kind of two mode fibers of ultralow decaying of gradation type |
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| CN108333674A (en) * | 2018-02-13 | 2018-07-27 | 长飞光纤光缆股份有限公司 | A kind of six mode fibers of ultralow decaying of step change type |
| CN108363141A (en) * | 2018-02-13 | 2018-08-03 | 长飞光纤光缆股份有限公司 | A kind of four mode fibers of ultralow decaying of step change type |
| CN108363139A (en) * | 2018-02-13 | 2018-08-03 | 长飞光纤光缆股份有限公司 | A kind of two mode fibers of ultralow decaying of step change type |
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