CN104898201B - A kind of single-mode fiber of ultralow attenuation large effective area - Google Patents
A kind of single-mode fiber of ultralow attenuation large effective area Download PDFInfo
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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
- G02B6/03688—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 5 or more layers
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Abstract
The present invention relates to a kind of single-mode fiber of ultralow attenuation large effective area, include sandwich layer and covering, it is characterised in that core radius R1For 4.5~6.5 μm, sandwich layer Δ 1 is 0.05%~0.10%, coats inner cladding outside sandwich layer successively from inside to outside, the first sagging inner cladding, middle inner cladding, the second sagging inner cladding, aids in surrounding layer and surrounding layer, inner cladding diameter R2For 8.5~14 μm, Δ 2 is 0.35%~0.12%, the first sagging inner cladding diameter R3For 13~22 μm, Δ 3 is 0.7%~0.30%, middle inner cladding diameter R4For 14~23 μm, Δ 4 is 0.40%~0.15%；Second sagging inner cladding diameter R5For 18~30 μm, Δ 5 is 0.6%~0.25%；Aid in surrounding layer radius R6For 35~50 μm, Δ 6 is 0.55%~0.15%；Surrounding layer is pure silicon dioxide glassy layer.The present invention not only decays low, and effective area is big, and cabled cutoff wavelength is less than 1530nm, and has preferable bending loss, dispersion.
Description
Technical field
The present invention relates to optical fiber transmission technique field, and in particular to a kind of single mode with ultralow decay and large effective area
Optical fiber.
Background technology
With increasing rapidly for IP network data service, operator improves constantly for the demand of transmission capacity, in existing network
Single fiber capacity is gradually approaching limiting value 100Tbps.100G Transmission systems have started to enter the commercial first year.How to be passed in 100G
Further increase transmission capacity on the basis of defeated signal, be each system equipment business and operator's focus of attention.
In 100G and super 100G systems, receiving terminal uses coherent reception and Digital Signal Processing (DSP), Neng Gou
The dispersion and polarization mode dispersion (PMD) accumulated in electrical domain in the whole transmitting procedure of digital compensation；Signal is answered by using polarization mode
With the baud rate of signal, such as PM-QPSK, PDM-16QAM, PDM-32QAM is reduced with various high-order modulatings, even
PDM-64QAM and CO-OFDM.But high-order modulating is very sensitive to nonlinear effect, therefore to OSNR (OSNR)
Propose higher requirement.Low-loss large effective area fiber is introduced, can be that system brings raising OSNR and reduces non-linear effect
For the effect answered when using high power density system, nonlinear factor is that systematic function caused by being used to assess nonlinear effect is excellent
Bad parameter, it is defined as n2/Aeff.Wherein, n2 is the nonlinear refraction index of Transmission Fibers, AeffIt is the effective of Transmission Fibers
Area.Increase the effective area of Transmission Fibers, the nonlinear effect in optical fiber can be reduced.
The general single mode fiber of land Transmission system circuit is presently used for, its effective area only about 80um2Left and right.And
In the long haul transmission system of land, higher is required to the effective area of optical fiber, in general effective area is in 100um2More than.In order to
Laying cost is reduced, the use of repeater is reduced as far as possible, in repeatless transmission system, such as undersea transmission system, transmission light
Fine effective area is preferably in 130um2More than.However, at present in the design of the refractive index profile of large effective area fiber, often
Big effective area is obtained by increasing the diameter for the optical core layer for being used to transmit optical signal.There is certain for such scheme
Design difficulty.On the one hand, the sandwich layer of optical fiber and its close covering mainly determine the basic performance of optical fiber, and in fiber manufacturing
Larger proportion is occupied in cost, if the radial dimension of design is excessive, the manufacturing cost of optical fiber will necessarily be improved, raise optical fiber
Price, by as the commonly used obstacle of this type optical fiber.On the other hand, compared to general single mode fiber, the increasing of optical fiber effective area
Greatly, the deterioration of some other parameter of optical fiber can be brought：It is difficult if cutoff wavelength is excessive for example fiber cut off wavelength can increase
To ensure the single mode of optical fiber optical signal in wave band is transmitted；In addition, if Refractive Index Profile of Optical design is improper, can also lead
Cause the deterioration of the parameters such as bending property, dispersion.
The optic fibre characteristic of another kind limitation long range high capacity transmission is exactly to decay, current conventional G.652.D optical fiber
Decay is typically gradually reduced in 0.20dB/km, laser energy after being transmitted through long-distance, so needing the form using relaying
Signal is amplified again.And the relative cost with optical fiber cable, relay station relevant device and maintenance cost are in whole chain-circuit system
More than 70%, if so being related to a kind of low decay or ultralow attenuating fiber, it is possible to effectively extend transmission distance, subtract
Few construction and maintenance cost.By correlation computations, if the decay of optical fiber is reduced into 0.16dB/km, whole link from 0.20
Construction cost by overall reduction 30% or so.
In summary, develop a kind of ultralow attenuation large effective area optical fiber of design as optical fiber fabrication arts one is important
Problem.Document US2010022533 proposes a kind of design of large effective area fiber, in order to obtain lower Rayleigh coefficient, its
Using the design of pure silicon core, in the core without the codope for carrying out germanium and fluorine, and its design is using the silica of fluorine doped
As surrounding layer.Design for this pure silicon core, it requires that inside of optical fibre must carry out the viscosity matching of complexity, and requires
Extremely low speed is used in drawing process, the defects of avoiding high-speed wire-drawing from causing inside of optical fibre caused decay increase, manufactures work
Skill and its complexity.
Document EP2312350 proposes a kind of large effective area fiber design of non-pure silicon core design, and it uses stepped
The cladding structure that sink designs, and has a kind of design to use pure silicon dioxide outsourcing Rotating fields, and correlated performance can reach big effectively
The area fiber G.654.B requirement with D.But the clad section maximum radius of Fluorin doped is 36 μm in its design, although can be with
Ensure that the cutoff wavelength of optical fiber is less than or equal to 1530nm, but influenceed by its smaller Fluorin doped radius, optical fiber it is microcosmic and grand
See bending property to be deteriorated, so during optical fiber cabling, decay can be caused to increase, also do not refer to related bending in its document
Performance.
Document CN10232392A describes a kind of optical fiber with more large effective area.The invention optical fiber it is effective
Although area has reached 150 μm2More than, but because employ conventional germanium and fluorine is co-doped with the sandwich layer design of mode, and pass through
Sacrifice the performance indications realization of cutoff wavelength.It allows cable cut-off wavelength in more than 1450nm, in its embodiment
In, cabled cutoff wavelength has been even up to more than 1800nm.Among practical application, too high cutoff wavelength is difficult to ensure that optical fiber
Ended in application band, it is in single mode in transmission that just can not ensure optical signal.Therefore, the type optical fiber is in the application
A series of practical problems may be faced.In addition, in embodiment cited by the invention, sink cladding outer diameter R3Minimum 16.3 μ
M, it is equally bigger than normal.The invention is no can be in optical fiber parameter (e.g., effective area, cutoff wavelength etc.) and fiber manufacturing cost
In obtain optimum combination.
From analysis above, we it can be found that existing carry out ultralow decay using non-pure silicon core and part Fluorin doped covering
The feasibility of optical fiber fabrication technology design.But influenceed by fibre-optic waveguide design limiting factor, if made using pure silicon dioxide
For outsourcing layer, how under such design, the optical parametric of optical fiber is controlled, is our facing challenges.
Because if using the pure silicon dioxide of no Fluorin doped as outsourcing layer, 3 problems can be faced.
First, suppress basic mode cut-off：In fibre-optic waveguide design, outsourcing layer and core material refractive index difference are too
It is small, optical fiber basic mode can be caused to reveal, so as to influence the decay of optical fiber.So using non-ultralow the declining for mixing the design of F outsourcing layers
Subtract large effective area fiber, because relative to traditional fiber, sandwich layer diameter is bigger, just must be in surrounding layer and sandwich layer interposition
Put, designed by rational fibre profile, suppress basic mode leakage.
General traditional large effective area fiber optimizes the ripple of fiber glass part using single sagging cladding structure
Lead.It is to optimize MFD using sagging structure first that main purpose, which is, obtains larger effective area, this be in optical design most
Conventional method；Secondly it is exactly because the sandwich layer diameter of large effective area fiber is typically bigger, so as to cause the bending of optical fiber
Poor-performing, so optimizing the bending property of optical fiber using the cladding structure that sink.
Single sagging cladding structure design and manufacture relatively easy, so common, especially normal attenuation coefficient is big
It is very common in effective area fiber design.But if in ultralow attenuation large effective area fiber design, in particular by
Pure silicon dioxide material is as in the ultralow attenuation large effective area optical fiber of surrounding layer, because the refractive index of sandwich layer is the same as pure titanium dioxide
The refractive index difference of silicon surrounding layer is little, and the sandwich layer diameter of large effective area fiber design is usually quite greatly, is easier to
The basic mode leakage that fibre-optic waveguide is most had a headache in designing is caused, causes optical fiber long wavelength to decay abnormal.And conventional solution, such as increase
The methods of adding the volume of single sagging covering, can cause the cutoff wavelength of optical fiber exceeded again, so finding a kind of bag that preferably sink
Layer design method, and realize the emphasis of ultralow attenuation large effective area fiber design.
Second, consider viscosity matching：If not doing any viscosity optimization design in outsourcing layer, its viscosity with it is interior
The problems such as covering and sandwich layer viscosity gradient mismatch, the defects of will also result in interface location and virtual temperature raise, so as to increase
Optical fiber attenuation.Using single sagging cladding structure or double sagging cladding structures, while fibre-optic waveguide optimization is realized, using not
With the difference of sagging structure doping, fibre profile viscosity matched design is more beneficial for.In brief, if not using sagging covering
Design, then the viscosity of inner cladding segment designs a just only gradient；Using single sagging cladding structure, it is possible to increase by one
Individual gradient；Using double sagging cladding structures, be equivalent to three gradients of increase (two sagging covering positions doping are different, under
Falling into the position between covering and sagging covering can also be designed using special viscosity).
3rd, consider optical cross-sectional matching：If using pure silicon dioxide glass as outsourcing layer, considering to be responsible for
During viscosity matched design, just define various pieces doping concentration, and in order to demonstrate,prove the optical parametric of optical fiber meet G652 or
The parameter request of G654 optical fiber, had both ensured the MFD of optical fiber, and dispersion and bending property meet standard requirement, require that we are necessary again
Consider optical cross-sectional design.This requires us, when carrying out viscosity design, to consider the optical design of optical fiber, add work
The difficulty that skill is realized.
Document US8515231B2 proposes a kind of single-mode fiber of double sagging cladding structures, but its plug used is highly concentrated
The design of Ge doping is spent, sandwich layer diameter is smaller, so ultralow fade performance can not be reached, and effective area is significantly less than 100 μ
m2, it is impossible to suppress the nonlinear effect of optical fiber.
The content of the invention
It is definition and the explanation for some terms being related in the present invention below：
Relative index of refraction Δ ni：
Counted since fiber core axis, according to the change of refractive index, that layer being defined as near axis is fibre core
Layer, the outermost layer of optical fiber is that pure silicon dioxide layer is defined as optical fiber jacket.
Each layer relative index of refraction Δ i of optical fiber is defined by below equation：
Wherein niFor the refractive index of fibre core, and ncFor outermost cladding index, the i.e. pure dioxy without progress Ge or F doping
The refractive index of SiClx.
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
The variable quantity of silica glass refractive index, wherein ncFor outermost cladding index, the i.e. pure dioxy without progress Ge or F doping
The refractive index of SiClx.
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 obtain data.
The technical problems to be solved by the invention are intended to design a kind of ultralow decay with relatively low fiber manufacturing cost big
The single-mode fiber of effective area, its cabled cutoff wavelength are less than 1530nm, and with preferable bending loss, dispersion.
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 described core radius R1For 4.5~6.5 μm, sandwich layer refractive index contrast Δ 1 is -0.05%~0.10%, outside sandwich layer
Coat inner cladding successively from inside to outside, first sink inner cladding, middle inner cladding, and second sink inner cladding, auxiliary surrounding layer and
Surrounding layer, the inner cladding diameter R of described optical fiber2For 8.5~14 μm, refractive index contrast Δ 2 is -0.35%~-0.12%,
The sagging inner cladding diameter R of described first3For 13~22 μm, refractive index contrast Δ 3 is -0.7%~-0.30%, in centre
Cladding radius R4For 14~23 μm, refractive index contrast Δ 4 is -0.40%~-0.15%；Second sagging inner cladding diameter R5For
18~30 μm, refractive index contrast Δ 5 is -0.6%~-0.25%；Described auxiliary surrounding layer radius R6For 35~50 μm, phase
Refractive index difference Δ 6 is -0.55%~-0.15%；The surrounding layer is pure silicon dioxide glassy layer.
By such scheme, the sandwich layer of optical fiber is the silica glass layer that germanium and fluorine are co-doped with, or is the silica for mixing germanium
Glassy layer, the Ge-doped relative index of refraction contribution amount Δ Ge of its center core layer are 0.02%~0.10%.
By such scheme, middle inner cladding diameter is more than the first sagging inner cladding diameter, and R4-R3≥1μm。
By such scheme, the optical fiber is 100~145 μm in the effective area of 1550nm wavelength2, it is under optimum condition
120~140 μm2。
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, attenuation of the optical fiber at wavelength 1550nm is equal to or less than 0.175dB/km；Optimum condition
It is equal to or less than 0.170dB/km down；Attenuation of the optical fiber at wavelength 1625nm is equal to or less than 0.204dB/km；It is preferred that
Under the conditions of be equal to or less than 0.194dB/km.
By such scheme, microbending loss of the optical fiber at wavelength 1700nm is equal to or less than 3dB/km.
By such scheme, at wavelength 1550nm, the macrobending loss that R15mm bend radius 10 is enclosed is equal to the optical fiber
Or less than 0.25dB, the macrobending loss that R10mm bend radius 1 is enclosed is equal to or less than 0.75dB.
The beneficial effects of the present invention are：1st, designed using the sandwich layer for mixing germanium, reasonably devise the viscosity of inside of optical fibre
Matching, defect in fiber preparation is reduced, reduce the attenuation parameter of optical fiber.2nd, the sagging knot of rational optical fiber Fluorin doped is devised
Structure, and by the rational design to each core layer section of optical fiber, there is optical fiber and be equal to or more than 100 μm2Effective area,
Under preferable parameter area, it can reach equal to or more than 130 μm2, even greater than 140 μm2Effective area.3rd, it is sunk using double
Cladding structure designs, and effectively inhibits basic mode to end problem, and using the method for high-order mode coupling, effectively reduce optical fiber
Cutoff wavelength.To ensure the single mode of type optical fiber optical signal in C-band transmission application, and to the bending loss of optical fiber
Acted on preferable improvement.4th, outermost outsourcing Rotating fields employ the design of pure silicon dioxide, reduce Fluorin doped glass
Glass proportion in a fiber, so as to reduce fiber manufacturing production cost.
Brief description of the drawings
Fig. 1 is the refractive index profile structure distribution figure of one embodiment of the invention.
Embodiment
The present invention will be described in detail with reference to embodiments.
Including sandwich layer and covering, described sandwich layer is the silica glass layer that germanium and fluorine are co-doped with, or to mix the two of germanium
Silicon oxide glass layers, sandwich layer coat inner cladding successively from inside to outside outside, and the first sagging inner cladding, middle inner cladding, second sink
Inner cladding, aid in surrounding layer and surrounding layer.Surrounding layer normal diameter is 125 μm.
Table one is classified as the refractive index profile parameter of the preferred embodiment of the invention, and wherein Δ Ge is the Ge-doped phase of sandwich layer
Refractive index contribution amount.Table two is the light-transfer characteristic described in table one corresponding to optical fiber.
The fibre profile parameter of table one, the embodiment of the present invention
Table two, the optical fiber optics of the embodiment of the present invention and bending property parameter
Claims (10)
1. a kind of single-mode fiber of ultralow attenuation large effective area, includes sandwich layer and covering, it is characterised in that the sandwich layer
Radius R1For 4.5~6.5 μm, sandwich layer refractive index contrast Δ 1 is -0.05%~0.10%, is wrapped successively from inside to outside outside sandwich layer
Inner cladding is covered, the first sagging inner cladding, middle inner cladding, the second sagging inner cladding, aids in surrounding layer and surrounding layer, the interior bag
The radius R of layer2For 8.5~14 μm, refractive index contrast Δ 2 is -0.35%~-0.12%, the described first sagging inner cladding
Radius R3For 13~22 μm, refractive index contrast Δ 3 is -0.7%~-0.30%, middle inner cladding diameter R4For 14~23 μm,
Refractive index contrast Δ 4 is -0.40%~-0.15%；Second sagging inner cladding diameter R5For 18~30 μm, refractive index contrast
Δ 5 is -0.6%~-0.25%；The radius R of the auxiliary surrounding layer6For 35~50 μm, refractive index contrast Δ 6 for-
0.55%~-0.15%；The surrounding layer is pure silicon dioxide glassy layer.
2. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1, it is characterised in that the sandwich layer of the optical fiber
The silica glass layer being co-doped with for germanium and fluorine, or to mix the silica glass layer of germanium, the Ge-doped relative folding of its center core layer
Rate contribution amount Δ Ge is penetrated as 0.02%~0.10%.
3. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that middle inner cladding half
Footpath is more than the first sagging inner cladding diameter, and R4-R3≥1μm。
4. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber exists
The effective area of 1550nm wavelength is 100~145 μm2。
5. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber into
Cable cutoff wavelength is equal to or less than 1530nm.
6. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the zero of the optical fiber
Dispersion point is less than or equal to 1300nm.
7. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in ripple
Dispersion at long 1550nm is equal to or less than 23ps/nm*km, and dispersion of the optical fiber at wavelength 1625nm is equal to or less than
27ps/nm*km。
8. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in ripple
Attenuation at long 1550nm is equal to or less than 0.175dB/km, and attenuation of the optical fiber at wavelength 1625nm is equal to or less than
0.204dB/km。
9. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in ripple
Microbending loss at long 1700nm is equal to or less than 3dB/km.
10. the single-mode fiber of the ultralow attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber exists
At wavelength 1550nm, the macrobending loss that R15mm bend radius 10 is enclosed is equal to or less than 0.25dB, and R10mm bending radius is curved
The macrobending loss of the circle of song 1 is equal to or less than 0.75dB.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443875A (en) * | 2016-08-22 | 2017-02-22 | 长飞光纤光缆股份有限公司 | Ultra-low attenuation bend insensitive single-mode fiber |
| CN109683232A (en) * | 2019-02-22 | 2019-04-26 | 长飞光纤光缆股份有限公司 | Single mode optical fiber with ultralow attenuation large effective area |
| CN111562648B (en) * | 2020-04-30 | 2022-12-16 | 江苏永鼎光纤科技有限公司 | Large effective mode area low-loss optical fiber with optimized cladding components |
| CN115201961A (en) | 2022-06-14 | 2022-10-18 | 江苏亨通光导新材料有限公司 | G.654.E optical fiber for land and manufacturing process thereof |
| CN116880003B (en) * | 2023-09-06 | 2023-12-15 | 江苏亨通光纤科技有限公司 | Anti-radiation ultra-low loss single mode fiber with double-mesa waveguide guide structure |
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| CN1377472A (en) * | 1999-07-27 | 2002-10-30 | 康宁股份有限公司 | Optical waveguide having negative dispersion and large |
| CN101055331A (en) * | 2006-04-10 | 2007-10-17 | 德雷卡通信技术公司 | Single-mode optical fibre |
| CN101738681A (en) * | 2010-01-20 | 2010-06-16 | 长飞光纤光缆有限公司 | High bandwidth multimode fiber |
| CN102099711A (en) * | 2007-11-09 | 2011-06-15 | 德雷卡通信技术公司 | Microbend- resistant optical fiber |
| CN104216044A (en) * | 2014-09-17 | 2014-12-17 | 长飞光纤光缆股份有限公司 | Low-attenuation bending insensitive single mode fiber |
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| US6937805B2 (en) * | 2001-10-26 | 2005-08-30 | Fujikura, Ltd. | Dispersion compensating fiber and dispersion compensating fiber module |
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| CN1377472A (en) * | 1999-07-27 | 2002-10-30 | 康宁股份有限公司 | Optical waveguide having negative dispersion and large |
| CN101055331A (en) * | 2006-04-10 | 2007-10-17 | 德雷卡通信技术公司 | Single-mode optical fibre |
| CN102099711A (en) * | 2007-11-09 | 2011-06-15 | 德雷卡通信技术公司 | Microbend- resistant optical fiber |
| CN101738681A (en) * | 2010-01-20 | 2010-06-16 | 长飞光纤光缆有限公司 | High bandwidth multimode fiber |
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Effective date of registration: 20200417 Address after: 311305 No.123 Shidi street, Hengfan industrial district, science and Technology City, Qingshanhu street, Lin'an District, Hangzhou City, Zhejiang Province Patentee after: ZHEJIANG LIANFEI FIBER OPTICAL CABLE Co.,Ltd. Address before: 430073 No. 9 Optics Valley Avenue, East Lake New Technology Development Zone, Wuhan, Hubei Patentee before: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK Ltd. |
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Effective date of registration: 20200604 Address after: Nine Li Town, Mount Emei, Sichuan, Leshan 614222, China Patentee after: Sichuan Lefei Photoelectric Technology Co.,Ltd. Address before: 311305 No.123 Shidi street, Hengfan industrial district, science and Technology City, Qingshanhu street, Lin'an District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG LIANFEI FIBER OPTICAL CABLE Co.,Ltd. |
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