CN106443875A - Ultra-low attenuation bend insensitive single-mode fiber - Google Patents
Ultra-low attenuation bend insensitive single-mode fiber Download PDFInfo
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- CN106443875A CN106443875A CN201610703044.XA CN201610703044A CN106443875A CN 106443875 A CN106443875 A CN 106443875A CN 201610703044 A CN201610703044 A CN 201610703044A CN 106443875 A CN106443875 A CN 106443875A
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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
- G02B6/03661—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 4 layers only
- G02B6/03672—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 4 layers only arranged - - + -
-
- 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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention relates to an ultra-low attenuation bend insensitive single-mode fiber. The ultra-low attenuation bend insensitive single-mode fiber includes a core layer and a cladding layer, and is characterized in that the radius r1 of the core layer is 3.0-3.9 Mu m, and Delta n1 is -0.04%-0.12%; an inner cladding layer, a bogging inner cladding layer and an outer cladding layer are successively cladded from inside to the outside for the core layer; the radius r2 of the inner cladding layer is 3.5-14 Mu m, and Delta n2 is -0.35% to -0.10%; the radius r3 of the bogging inner cladding layer is 10-20Mu m, and Delta n3 is -0.6% to -0.2%; the outer cladding layer is a fully fluorine-doped silica vitreous lamella, and the relative refractive index Delta n4 is -0.4% to -0.2%; and the diameter of the outermost layer of the fiber is 125 Mu m. For the ultra-low attenuation bend insensitive single-mode fiber, a fiber core cladding layer profile structure and the viscosity coupling in the fiber are reasonably designed, so that the attenuation parameter of the fiber is reduced. Besides, the fiber profile uses a multi-layer step-type bogging cladding layer structure, wherein the relatively wide bogging cladding layer structure is used for restricting leakage of a basic mode, so that the bending loss of the fiber can be modified preferably. Furthermore, the outermost outer cladding layer structure utilizes the fully fluorine-doped silica vitreous lamella design, so that the profile design of the fiber can be simplified and production and control can be easily realized.
Description
Technical field
The present invention relates to a kind of ultralow decay bend-insensitive single-mode optical fiber, this optical fiber has relatively low attenuation, excellent
Bend-insensitive characteristic, belongs to optic communication transmission technique field.
Background technology
Fiber optic communication has, because of it, the features such as capacity is big, long transmission distance, transmission speed are fast, economic, is widely used
In long distance line net to Metropolitan Area Network (MAN) and access network.The development of Fibre Optical Communication Technology, is all to transmit speed with faster all the time
Rate, bigger capacity and farther transmission range are target, constantly lift and improve the performance indications of optical fiber and optical fiber
The communication technology.Particularly in recent years, with the explosive growth of IP operation amount, communication network is just starting sustainable to the next generation
Development direction stride forward, and construct have huge transmission capacity and distance fiber infrastructure be next generation network physical base
Plinth.In order to meet the development need of optical fiber telecommunications system, the correlated performance as the optical fiber of Networks of Fiber Communications transmission medium refers to
Mark is also required to improve further.
The attenuation coefficient of optical fiber is one of most important performance indications of optical fiber, determines fiber optic communication to a great extent
Repeater span.The attenuation coefficient of optical fiber is less, then the optical signal that it carries can transmission range more remote, and in same transmission distance
From under, the attenuated optical signal amplitude that it carries is less.Reduce attenuation coefficient and can effectively improve the light noise in fiber optic communication
Ratio OSNR, improves transmission quality and the transmission range of system further.In the fiber optic communication of distance, optical signal be by
Continuing stands to complete transmission, if the attenuation coefficient of optical fiber is less, the unrepeatered transmission distance of optical signal is more remote, then can
To increase the distance between relay station, thus greatly reducing the setting of relay station, cut operating costs.Therefore, reduce optical fiber
Attenuation coefficient either, in terms of optimizing system architecture and still cutting operating costs, all has very important significance.And it is another
Aspect, with the continuous development of FTTX in recent years, the performance of original G.652 optical fiber has been difficult to meet user's requirement, and reality should
With environmental requirement optical fiber, there is certain bending resistance, then on the basis of G.652 optical fiber, have developed the curved of a new generation
Bent insensitive single-mode fiber G.657 optical fiber, wherein comprising being capable of the compatible G.652 G.657.A type optical fiber of standard and can not
G.657.B the type optical fiber of compatible G.652 standard.G.657.A type optical fiber and G.652.D optical fiber have good compatibility, and its phase
For common G.652.D optical fiber, there is more preferable bending resistance, therefore it is considered as the existing G.652 light of most possible replacement
One of fine product.So invention a kind of and G.652 standard compatible, and have lower decay, relatively large mode field diameter with
When also there is the single-mode fiber of new generation of bend-insensitive characteristic become a study hotspot in telecommunication optical fiber field.
Typically optical fiber attenuation can be reduced using following several method in the manufacture process of preform.Such as,
Using the raw material of higher purity, improve production environment and equipment sealing property reduces the probability that introduced contaminants introduces, such as patent
CN201110178833.3 using the bubble-tight method during raising prefabricated fiber rod depositing, reduces drawing of introduced contaminants
Enter.Or the prefabricated rods manufacturing process using bigger external diameter, reduces the entirety of optical fiber by the dilution effect of large size prefabricated rod
Decay.In addition, in optical fiber manufacturing processes, the coating processes of bare fibre face coat are also one of impact optical fiber attenuation performance
Key factor.But, no matter in the cost theoretically or in actual fiber preparation and technology controlling and process for, reduce optical fiber
The section adulterating and optimizing optical fiber is method that is the simplest and effectively reducing optical fiber attenuation.In general, dopant material is dense
Degree is lower, then the loss caused by Rayleigh scattering is less.In traditional single-mode fiber, in order to ensure the total reflection in optical fiber,
Must assure that enough refractive index differences, the relative index of refraction of sandwich layer is far longer than the interior bag of optical fiber between sandwich layer and inner cladding
Layer；In order to ensure such design it is necessary to carry out the doping that substantial amounts of Ge or Ge/F is co-doped with form in the core, and traditional
In fibre profile design, laser energy becomes Gaussian Profile formal distribution in fibre profile, and optical-fiber laser energy has 70% about
Propagate in the more sandwich layer part of doping relatively, that is, the Laser Transmission of high-energy-density concentrates on the larger high concentration of Rayleigh coefficient
Propagate in doping sandwich layer.If designed by rational optical cross-sectional, designing a kind of section of energy non-gaussian distribution, reducing high
In doped in concentrations profiled sandwich layer, the loss of energy is it is possible to significantly reduce the fade performance of optical fiber.
But in these routines G.657 Section Design of optical fiber and manufacture method, sandwich layer is co-doped with using larger amount of Ge/F,
In order to obtain the macrobend performance of optimum, the relative index of refraction of sandwich layer is typically greater than 0.35%, and that is, sandwich layer Ge doping is more, therefore
Larger Rayleigh scattering can be brought thus increasing the decay of optical fiber.
Document CN201310394404 proposes a kind of design of ultralow attenuating fiber, and it uses the surrounding layer of pure silicon dioxide
Design, and typical step cross-section structure, do not have the bending using the inner cladding design optimization optical fiber that sink, and its sandwich layer does not make
It is doped with Ge, it is possible that causing viscosity mismatch during prefabricated rods preparation, its decay and bent horizontal are relatively poor.
Content of the invention
It is below the definition of some terms being related in the present invention and explanation：
Start to count from fiber core axis, according to the change of refractive index, being defined as near that layer of axis is fibre core
Layer, the outermost layer of optical fiber is defined as optical fiber jacket.
Optical fiber each layer relative index of refraction Δ niDefined by below equation,
Wherein niFor the refractive index of certain fine layer, and ncRefractive index for pure silicon dioxide.
The relative index of refraction contribution amount Δ Ge of fiber core layer Ge doping is defined by below equation,
Wherein nGeFor assuming the Ge alloy of fibre core, in being doped to the pure silicon dioxide not having other alloys, cause
Absolute index of refraction obtained from the rising of silica glass refractive index, and ncIt is the pure silicon dioxide not 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 22 meters and be not re-used as the wavelength that single mode signal is propagated afterwards.Test when need to by optical fiber around a radius
The circle of 14cm, the circle of two radius 4cm is obtaining data.
The technical problem to be solved aims to provide a kind of to be had compared with lower attenuation coefficient and excellent bending property
Ultralow decay bend-insensitive single-mode optical fiber.
The present invention by solving the problems, such as adopted technical scheme set forth above is：Include sandwich layer and covering, its feature
It is described core radius r1For 3.0～3.9 μm, sandwich layer relative index of refraction Δ n1For -0.04%～0.12%, sandwich layer outer from
Coat inner cladding from inside to outside successively, sagging inner cladding and surrounding layer, described inner cladding diameter r2For 3.9～14 μm, relatively roll over
Penetrate rate Δ n2For -0.35%～-0.10%, described sagging inner cladding diameter r3For 10～22 μm, relative index of refraction Δ n3For-
0.6%～-0.2%, described surrounding layer is full fluorine doped silica glass layer, relative index of refraction Δ n4Scope be -0.4%～-
0.2%.
By such scheme, described sandwich layer is the silica glass layer that germanium fluorine and alkali metal are co-doped with, or germanium and alkali metal
The doping contribution amount of the silica glass layer being co-doped with, wherein germanium is 0.02%～0.10%, preferred scope 0.04%～
0.08%, alkali-metal doping (by weight) is 5～5000ppm.
By such scheme, described optical fiber is 8.4～9.1 μm in the mode field diameter of 1310nm wavelength, is 8.5 under optimum condition
～8.8 μm.
By such scheme, the cabled cutoff wavelength of described optical fiber is equal to or less than 1260nm.
By such scheme, the zero dispersion point of described optical fiber is 1300～1324nm.
By such scheme, the zero-dispersion slop of described optical fiber is less than or equal to 0.092.
By such scheme, dispersion at wavelength 1310nm for the described optical fiber is equal to or less than 18ps/nm*km, described optical fiber
Dispersion at wavelength 1625nm is equal to or less than 22ps/nm*km.
By such scheme, attenuation at wavelength 1310nm for the described optical fiber is equal to or less than 0.324dB/km；Optimum condition
It is equal to or less than down 0.30dB/km.
By such scheme, attenuation at wavelength 1550nm for the described optical fiber is equal to or less than 0.184dB/km；Optimum condition
It is equal to or less than down 0.170dB/km.
By such scheme, at wavelength 1550nm, the macrobending loss of R15mm bend radius 10 circle is equal to described optical fiber
Or it is less than 0.03dB, the macrobending loss of R10mm bend radius 1 circle is equal to or less than 0.1dB.
By such scheme, it is coated with resinous coat outside surrounding layer, the external diameter of described coating is 250 μm or 200 μm.
The beneficial effects of the present invention is：1st, reasonably devise the viscosity of optical fiber core covering cross-section structure and inside of optical fibre
Coupling, sandwich layer doping is few, reduces defect in fiber preparation, reduces the attenuation parameter of optical fiber；Sandwich layer carries out alkali metal
Doping process designs, and effectively reduces sandwich layer virtual temperature；2nd, devise the sagging structure of rational optical fiber Fluorin doped, and by light
The appropriate design of fine each core covering section, makes optical fiber have the MFD equal to or more than 8.4；3rd, the cutoff wavelength of the present invention, bending
The comprehensive performance parameter such as loss, dispersion are good in application band, sufficiently small cabled cutoff wavelength, to ensure that this type optical fiber exists
The single mode of optical signal in C-band transmission application, fibre profile adopts the sagging cladding structure of multi-step shape, has wider
Sagging cladding structure is used for limiting basic mode leakage, has preferable improvement effect to the bending loss of optical fiber；Can compatible G657.A2
Standard；4th, outermost outsourcing Rotating fields employ the earth silicon material design of full doping fluorine, are conducive to simplifying cuing open of optical fiber
Face design controls it is easy to produce.
Brief description
Fig. 1 is the refractive index profile structure distribution figure of one embodiment of the invention.
Specific embodiment
It is described in detail with reference to embodiments.
Include sandwich layer and covering, described sandwich layer is the silica that germanium fluorine and alkali metal (lithium sodium potassium rubidium caesium francium) are co-doped with
Glassy layer, or the silica glass layer being co-doped with for germanium and alkali metal (one or more of lithium, sodium, potassium, rubidium, caesium, francium), core
Layer is outer to be covering, from inside to outside coats inner cladding successively, sink inner cladding and surrounding layer.Described surrounding layer is full fluorine doped titanium dioxide
Silica glass layer.Described surrounding layer radius r4For 62.5 μm, a diameter of 125 microns.
The refractive index profile parameter of the be classified as preferred embodiment of the invention of table one, wherein Δ Ge are Ge doping in sandwich layer
Refractive index contribution amount, K is the content of potassium element in sandwich layer.Table two is the optical parametric characteristic corresponding to optical fiber described in table one.
Table one, the fibre profile parameter of the embodiment of the present invention
Table two, the optical fiber parameter of the embodiment of the present invention
Claims (9)
1. a kind of ultralow decay bend-insensitive single-mode optical fiber, includes sandwich layer and covering it is characterised in that described sandwich layer half
Footpath r1For 3.0～3.9 μm, sandwich layer relative index of refraction Δ n1For -0.04%～0.12%, from inside to outside coat successively outside sandwich layer in
Covering, sagging inner cladding and surrounding layer, described inner cladding diameter r2For 3.5～14 μm, relative index of refraction Δ n2For -0.35%
～-0.10%；Described sagging inner cladding diameter r3For 10～20 μm, relative index of refraction Δ n3For -0.6%～-0.2%, described
Surrounding layer is full fluorine doped silica glass layer, relative index of refraction Δ n4For -0.4%～-0.2%.
2. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that described sandwich layer is germanium
The silica glass layer that fluorine and alkali metal are co-doped with, or the silica glass layer that germanium is co-doped with alkali metal, the wherein doping of germanium
Contribution amount is 0.02%～0.10%, and alkali metal content is 5～5000ppm.
3. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that described optical fiber exists
The mode field diameter of 1310nm wavelength is 8.4～9.1 μm.
4. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 3 is it is characterised in that the stranding of described optical fiber cuts
Only wavelength is equal to or less than 1260nm.
5. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that zero color of described optical fiber
Scatterplot is 1300～1324nm；The zero-dispersion slop of described optical fiber is less than or equal to 0.092.
6. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that described optical fiber is in wavelength
Dispersion at 1310nm is equal to or less than 18ps/nm*km, and dispersion at wavelength 1625nm for the described optical fiber is equal to or less than
22ps/nm*km.
7. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that described optical fiber is in wavelength
Attenuation at 1310nm is equal to or less than 0.324dB/km.
8. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that described optical fiber is in wavelength
Attenuation at 1550nm is equal to or less than 0.184dB/km.
9. the ultralow decay bend-insensitive single-mode optical fiber as described in claim 1 or 2 is it is characterised in that described optical fiber is in wavelength
At 1550nm, the macrobending loss of R15mm bend radius 10 circle is equal to or less than 0.03dB, and R10mm bend radius 1 are enclosed
Macrobending loss be equal to or less than 0.1dB.
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| CN201610703044.XA CN106443875A (en) | 2016-08-22 | 2016-08-22 | Ultra-low attenuation bend insensitive single-mode fiber |
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| CN201610703044.XA CN106443875A (en) | 2016-08-22 | 2016-08-22 | Ultra-low attenuation bend insensitive single-mode fiber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193082A (en) * | 2017-05-04 | 2017-09-22 | 长飞光纤光缆股份有限公司 | A kind of ultralow decay single-mode fiber |
| CN107422415A (en) * | 2017-06-15 | 2017-12-01 | 长飞光纤光缆股份有限公司 | A kind of single-mode fiber of ultralow attenuation large effective area |
| 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 |
| CN109298482A (en) * | 2018-11-28 | 2019-02-01 | 长飞光纤光缆股份有限公司 | A kind of large-effective area single mode fiber of low decaying and low bend loss |
| CN109839694A (en) * | 2017-11-27 | 2019-06-04 | 中天科技精密材料有限公司 | A kind of cutoff wavelength displacement single mode optical fiber |
| CN111289021A (en) * | 2020-03-16 | 2020-06-16 | 中天科技光纤有限公司 | Optical fiber sensing device and detection system |
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| CN104898201A (en) * | 2015-06-25 | 2015-09-09 | 长飞光纤光缆股份有限公司 | Ultralow attenuation large-effective-area single-mode optical fiber |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193082A (en) * | 2017-05-04 | 2017-09-22 | 长飞光纤光缆股份有限公司 | A kind of ultralow decay single-mode fiber |
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| CN107422415B (en) * | 2017-06-15 | 2020-05-05 | 长飞光纤光缆股份有限公司 | Single-mode fiber with ultralow attenuation and large effective area |
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| CN107490819B (en) * | 2017-08-22 | 2020-05-05 | 长飞光纤光缆股份有限公司 | Single mode optical fiber with ultra-low attenuation and large effective area |
| CN109839694A (en) * | 2017-11-27 | 2019-06-04 | 中天科技精密材料有限公司 | A kind of cutoff wavelength displacement single mode optical fiber |
| CN109839694B (en) * | 2017-11-27 | 2020-08-18 | 中天科技精密材料有限公司 | Single mode fiber with cut-off wavelength displacement |
| CN109298482A (en) * | 2018-11-28 | 2019-02-01 | 长飞光纤光缆股份有限公司 | A kind of large-effective area single mode fiber of low decaying and low bend loss |
| CN111289021A (en) * | 2020-03-16 | 2020-06-16 | 中天科技光纤有限公司 | Optical fiber sensing device and detection system |
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Application publication date: 20170222 |