CN105334570B - A kind of low decaying bend-insensitive single-mode optical fiber - Google Patents
A kind of low decaying bend-insensitive single-mode optical fiber Download PDFInfo
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- CN105334570B CN105334570B CN201510833247.6A CN201510833247A CN105334570B CN 105334570 B CN105334570 B CN 105334570B CN 201510833247 A CN201510833247 A CN 201510833247A CN 105334570 B CN105334570 B CN 105334570B
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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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
- G02B6/0285—Graded index layer adjacent to the central core segment and ending at the outer cladding index
-
- 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 - - +
Abstract
The present invention relates to a kind of low decaying bend-insensitive single-mode optical fibers for optic communication Transmission system, include sandwich layer and covering, it is characterized in that the core refractive rate presses α parabola shaped distribution, profile exponent α is 1.5~9.0, the covering is followed successively by inner cladding, intermediate cladding layer and surrounding layer from inside to outside, the parabola shaped sandwich layer maximum relative refractive index difference Δ 1 is 0.25%~0.45%, and core radius R1 is 5.0 μm~7.0 μm；The inner cladding relative fefractive index difference Δ 2 is 0.20%~0%, and inner cladding diameter R2 is 7.0 μm~10.0 μm；The intermediate cladding layer relative fefractive index difference Δ 3 is 0.20%~0%, and intermediate cladding layer radius R3 is 10.0 μm~20.0 μm；The surrounding layer is pure quartz glass layer.The present invention not only refractive index profile reasonable design, doping is low, and has excellent anti-attenuation and bending resistance.
Description
Technical field
The present invention relates to a kind of low decaying bend-insensitive single-mode optical fiber for optic communication Transmission system, fade performances
Better than conventional G.652D optical fiber, macrobending loss meets G.657A1 standard, and can be completely compatible with G.652D optical fiber, belongs to
Technical field of optical fiber communication.
Background technology
Fiber optic communication has the characteristics that big transmission capacity, long transmission distance, transmission speed are fast, is widely used in long distance line
The optical communication networks such as net, Metropolitan Area Network (MAN) and access net.The single mode optical fiber for meeting ITU-T G.652D standards is most common communication
Optical fiber.On the one hand, with the continuous development of FTTx, fiber to the home can face complicated construction ring inside corridor in many cases
Border, this requires optical fiber to have certain bending resistance, makes it that can still ensure signal in the case of small-bend radius
Normal transmission, then G.657 bend-insensitive single-mode optical fiber comes into being.G.657 optical fiber is divided into G.657A class and G.657B
Type optical fiber, wherein G.657A type optical fiber and G.652D optical fiber has compatibility well, and have than common G.652D optical fiber
Better bending resistance, therefore it is considered as one of the product for most possibly replacing existing G.652 optical fiber.On the other hand,
Power attenuation amplitude of the optical signal in transmission process can be reduced by reducing fiber attenuation coefficient, effectively improve optical signal to noise ratio, from
And improve the transmission range and transmission quality of optical fiber telecommunications system.In the optical fiber telecommunications system of long range, optical fiber attenuation is reduced
Coefficient can increase the span between relay station, to greatly reduce the quantity and cost of relay station, cut operating costs.Cause
This, invention one kind can be compatible with G.652D standard, and the single mode optical fiber with lower decaying and more excellent macrobending loss is with very
Important meaning.
The reason of optical fiber generation attenuation, mainly has：Absorption loss, including Intrinsic Gettering and Impurity Absorption；Scattering loss, packet
Include linear scattering, nonlinear scattering and the imperfect scattering of structure etc.；Additional attenuation, including microbending loss, bending loss and connecting
Loss etc..It is most importantly Impurity Absorption in absorption loss and causes attenuation, such as hydroxide ion of the impurity in fiber optic materials,
Transition metal ions is extremely strong to the absorbability of light.One of most important loss is Rayleigh scattering loss in scattering loss, it
It is a kind of linear scattering, the kind for the loss and dopant material that the biquadratic of size and optical wavelength is inversely proportional, while being induced by it
Class is related with concentration.The method that optical fiber attenuation is reduced in optical fiber manufacturing processes has following several.Reduce impurity in raw material
Content improves environment cleanliness in optical fiber manufacturing processes, reduces the extraneous content for introducing impurity, reduces the concentration of dopant material,
Optimization Section Design etc. can reduce optical fiber attenuation.For example, in Chinese patent CN201110178833.3, one kind is described
Using the method for the air-tightness during raising prefabricated fiber rod depositing, optical fiber damage is reduced by reducing the introducing of introduced contaminants
Consumption.For from the angle of cost control and technology controlling and process, by reducing the doping of optical fiber and optimizing the refractive index profile of optical fiber,
It is to reduce the most effective and most economical method of optical fiber attenuation.In Chinese patent CN201410423830.5 and
In CN201410473879.1, three sandwich layers being gradually reduced using refractive index optimize profile optimizing technique so that core layer is mixed
Germanium amount reduces, to reduce the attenuation coefficient of optical fiber by reducing Rayleigh scattering, but the section number of plies in the two patents compared with
It is more, need the parameter balanced more, technology controlling and process is more complex, and also limited to the reduction of attenuation coefficient.
The reason of optical fiber generation macrobending loss is since center axis bends when optical fiber bends, and light beam is mapped to
It is formed by angle of propagation at fibre-optical bending portion boundary and is more than critical value, result is exactly that cannot meet in the optical fiber of bending
Total internal reflection condition, this means that a part for light beam can be fled from away from the fibre core of optical fiber, to form the additional damage of macrobend
Consumption.
The method for reducing single mode optical fiber macrobending loss has：First, reducing fibre-optic mode field diameter, increasing fiber cut off wavelength, i.e.,
The ratio MAC value that both reduces promotes the bending resistance of optical fiber, and the method can pass through mode field diameter and cutoff wavelength
Optimization design is realized, simple and effective, does not increase extra cost, but the cutoff wavelength of optical fiber increase it is limited, it is necessary to be less than work
Wavelength is to ensure single mode operation state；Second is that increasing the lower sagging covering of refractive index in fibre cladding to prevent core light work(
The bending of rate is revealed, and the method is sunk covering in order to obtain, needs to adulterate a large amount of fluorine to reduce refractive index, if fluorine doped amount compared with
Senior general increases fiber manufacturing cost.As Chinese patent CN101523259B, CN103345017A, CN201210006792.4,
CN201210131418.7, CN201310300024.4, CN201410473879.1, CN201410591149.1, United States Patent (USP)
The method that US7450807 and European patent EP 1978383 etc. use sagging covering.But in these patents, sink packet
The refractive index of layer is very low, and fluorine doped amount is larger, therefore can increase technique controlling difficulty and manufacturing cost.
Invention content
Invention content is introduced for convenience, is defined as follows term：
Prefabricated rods：The radial refractive index distribution being made of sandwich layer and covering meets fiber design requirement and can directly be drawn into
The glass bar or assembly of designed optical fiber；
Plug：Solid glass prefabricated component containing sandwich layer and part of clad；
Radius：The distance between this layer of outer boundary and central point；
Refractive index profile：Relationship between optical fiber or preform (including plug) glass refraction and its radius；
Relative fefractive index difference：
Δ %=[(n (i)2–n(0)2)/(2n(i)2)] × 100% ≈ [n (i)-n (0)]/n (0) × 100%
N (i) and n (0) is respectively the refractive index of the refractive index and pure silicon dioxide glassy layer of corresponding i-th layer of optical fiber；
The contribution amount of fluorine (F)：Relative index of refraction difference (Δ F) of fluorine doped (F) quartz glass relative to pure quartz glass, with
This come indicate fluorine doped (F) measure；
The contribution amount of germanium (Ge)：Mix relative index of refraction difference (Δ of germanium (Ge) quartz glass relative to pure quartz glass
Ge), measured with this to indicate to mix germanium (Ge)；
Bushing pipe (Tube)：The substrate tube of tubulose meets the pure quartz glass pipe of certain geometry requirement；
OVD techniques：The quartz glass of required thickness is prepared with Outside Vapor deposition and sintering process；
VAD techniques：The quartz glass of required thickness is prepared with axial vapor deposition and sintering process；
APVD over cladding process：Natural or synthetic silica flour is melted 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.
Step type profile：Core refractive rate and cladding index are remained unchanged along radial direction, and core refractive rate is high
In the section of cladding index.
Technical problem to be solved by the present invention lies in above-mentioned the shortcomings of the prior art is overcome, a kind of low decaying is provided
Bend-insensitive single-mode optical fiber, its not only refractive index profile reasonable design, doping is low, and with excellent anti-attenuation and anti-
Bending property.
The present invention be solve the problems, such as it is set forth above used by technical solution be：
Include sandwich layer and covering, it is characterised in that the core refractive rate presses α parabola shaped distribution, profile exponent
α is 1.5~9.0, and the covering is followed successively by inner cladding, intermediate cladding layer and surrounding layer, the parabola shaped core from inside to outside
Layer maximum relative refractive index difference Δ 1 is 0.25%~0.45%, and core radius R1 is 5.0 μm~7.0 μm；The inner cladding phase
Refractive index difference Δ 2 is -0.20%~0%, and inner cladding diameter R2 is 7.0 μm~10.0 μm；The intermediate cladding layer is opposite to be rolled over
It is -0.20%~0% to penetrate rate difference Δ 3, and intermediate cladding layer radius R3 is 10.0 μm~20.0 μm；The surrounding layer is pure quartzy glass
Glass layer, relative fefractive index difference Δ 4 are 0%.
By said program, the parabola shaped sandwich layer relative fefractive index difference Δ (r) and the functional relation of radius r are as follows：
Δ (r)=- Δ 1 [(r/R1)α- 1], wherein r is distance of the sandwich layer point apart from core centre.
By said program, the profile exponent α is 2.0~8.0.
By said program, the profile exponent α is 2.8~6.0.
By said program, the profile exponent α is 3.6~4.8.
By said program, the sandwich layer is the silica glass layer that is co-doped with of germanium fluorine, wherein the contribution amount of fluorine be-
0.02%~-0.12%.
By said program, the inner cladding and intermediate cladding layer are that fluorine doped glass or germanium fluorine are co-doped with silica glass layer,
Or it is formed for pure quartz glass.
By said program, mode field diameter of the optical fiber at 1310nm wavelength is 8.4~9.6 μm.
By said program, attenuation coefficient of the optical fiber at 1310nm wavelength is less than or equal to 0.335dB/km, preferably
Under the conditions of be less than or equal to 0.324dB/km, attenuation coefficient at 1550nm wavelength is less than or equal to 0.195dB/km, preferably
Under the conditions of be less than or equal to 0.184dB/km.
By said program, the optical fiber has the cable cut-off wavelength less than or equal to 1260nm.
By said program, the zero-dispersion wavelength of the optical fiber is 1300nm~1324nm；Optical fiber is at zero-dispersion wavelength
Chromatic dispersion gradient is less than or equal to 0.092ps/ (nm2*km)。
By said program, optical fiber is at 1550nm wavelength, for additional around the bending of 10 circles around 15 millimeters of bending radius
Loss is less than or equal to 0.25dB, is less than or equal to 0.05dB under optimum condition；For what is enclosed around 1 around 10 millimeters of bending radius
It is bent added losses and is less than or equal to 0.75dB, be less than or equal to 0.5dB under optimum condition.
By said program, optical fiber is at 1625nm wavelength, for additional around the bending of 10 circles around 15 millimeters of bending radius
Loss is less than or equal to 1.0dB, is less than or equal to 0.3dB under optimum condition；It is curved for being enclosed around 1 around 10 millimeters of bending radius
Bent added losses are less than or equal to 1.5dB, are less than or equal to 1.0dB under optimum condition.
The beneficial effects of the present invention are：1. a kind of curved configuration of core layer refractive index gradient variation is proposed,
Refractive index is gradually continuously reduced from sandwich layer center to sandwich layer edge so that core layer mixes the reduction of germanium amount, to auspicious by reducing
Profit scatters to reduce the attenuation coefficient of optical fiber；2 shaped form graded index sandwich layers can reduce sandwich layer to greatest extent to be mixed germanium amount and puts
Wide macrobending loss can reduce optical fiber attenuation and macrobending loss, and technological parameter is easy to control simultaneously to the tolerance of MAC value
System；3. designing shallower sagging covering outside shaped form graded index sandwich layer can be reduced to be formed needed for fibre-optic waveguide
Core refractive rate mixes germanium amount to reduce sandwich layer, in addition, the bending that this sagging covering can also reduce fibre core luminous power is let out
Dew, so as to improve optical fiber bending resistance；4. shaped form graded index sandwich layer and shallower sagging covering are combined, it can
Lower optical fiber attenuation and macrobending loss are obtained, to obtain, fade performance compatible with conventional G.652D standard and bending resistance
Can more preferably low decaying bend-insensitive single-mode optical fiber, the span between relay station can be increased, reduce build associated base stations and
The cost of other systems equipment, while can also can meet harsher wiring environment or FTTx use environments；5. with conventional
G.657 optical fiber is compared, fibre-optic mode field diameter bigger of the invention, and it is multiple to advantageously reduce dense wavelength division for effective area also bigger
With the nonlinear effect in system, it is also beneficial to reduce the splice loss, splice attenuation with conventional G.652D optical fiber.
Description of the drawings
Fig. 1 is the Refractive Index Profile of Optical schematic diagram of one embodiment of the invention.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail.
The optical fiber of the present embodiment includes sandwich layer and covering, and the core refractive rate presses α parabola shaped distribution, distribution
Index α is 1.7~2.3, and the covering is followed successively by inner cladding, intermediate cladding layer and surrounding layer, the parabola from inside to outside
Shape sandwich layer relative fefractive index difference Δ (r) and the functional relation of radius r are as follows：Δ (r)=- Δ 1 [(r/R1)α- 1], wherein r is core
Certain puts the distance apart from core centre to layer, and Δ 1 is that parabola shaped sandwich layer maximum relative refractive index is poor, and R1 is core radius.It is described
Inner cladding relative fefractive index difference be Δ 2, inner cladding diameter R2；The intermediate cladding layer relative fefractive index difference is Δ 3, intermediate
Cladding radius is R3；The surrounding layer is pure quartz glass layer, and relative fefractive index difference is Δ 4.Parabola shaped sandwich layer is germanium fluorine
The silica glass layer being co-doped with, inner cladding and intermediate cladding layer are co-doped with silica glass layer or pure by fluorine doped glass, germanium fluorine
Quartz glass layer forms.Sandwich layer and inner cladding are made by vapour deposition process, and surrounding layer is pure silicon dioxide prepared by OVD techniques
Glassy layer, a diameter of 125 μm.
The drawing speed of the present embodiment optical fiber is 1000m/min~2500m/min, the drawing tensile force of bare fibre be 150g~
350g。
According to the technical solution of above-mentioned single mode optical fiber, the parameters of optical fiber are set in the range of its defined
Meter, according to the design requirement of optical fiber by the plugs manufacturing process such as gas-phase deposition (PCVD, MCVD, OVD or VAD technique) come
Plug is manufactured, the manufacture of entire preform is then completed by over cladding process such as OVD, APVD or VAD.Prepared light
The major parameter of fine refractive index profile structure and dopant material composition is as shown in table 1, the main performance ginseng of prepared optical fiber
Number is as shown in table 2.
Table 1：The cross-section structure and material of optical fiber form
Table 2：The Specifeca tion speeification of optical fiber
Claims (8)
1. a kind of low decaying bend-insensitive single-mode optical fiber, includes sandwich layer and covering, it is characterised in that the core refractive
Rate presses α parabola shaped distribution, and profile exponent α is 1.5~9.0, and the covering is followed successively by inner cladding, tundish from inside to outside
Layer and surrounding layer, the parabola shaped sandwich layer maximum relative refractive index difference Δ 1 are 0.25%~0.45%, and core radius R1 is
5.0 μm~7.0 μm；The inner cladding relative fefractive index difference Δ 2 be -0.20%~0%, inner cladding diameter R2 be 7.0 μm~
10.0μm；The intermediate cladding layer relative fefractive index difference Δ 3 be -0.20%~0%, intermediate cladding layer radius R3 be 10.0 μm~
20.0μm；The surrounding layer is pure quartz glass layer, and relative fefractive index difference Δ 4 is 0%；The sandwich layer is what germanium fluorine was co-doped with
Silica glass layer, the wherein contribution amount of fluorine are -0.02%~-0.12%；Decaying of the optical fiber at 1310nm wavelength
Coefficient is less than or equal to 0.324dB/km, and the attenuation coefficient at 1550nm wavelength is less than or equal to 0.184dB/km.
2. low decaying bend-insensitive single-mode optical fiber as described in claim 1, it is characterised in that the parabola shaped sandwich layer
Relative fefractive index difference Δ (r) and the functional relation of radius r are as follows：Δ (r)=- Δ 1 [(r/R1)α- 1], wherein r is sandwich layer point
Distance apart from core centre.
3. low decaying bend-insensitive single-mode optical fiber as described in claim 1 or 2, it is characterised in that the profile exponent α
It is 2.0~8.0.
4. low decaying bend-insensitive single-mode optical fiber as described in claim 1 or 2, it is characterised in that the profile exponent α
It is 2.8~6.0.
5. low decaying bend-insensitive single-mode optical fiber as described in claim 1 or 2, it is characterised in that the profile exponent α
It is 3.6~4.8.
6. low decaying bend-insensitive single-mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber is in 1310nm
Mode field diameter at wavelength is 8.4~9.6 μm.
7. low decaying bend-insensitive single-mode optical fiber as described in claim 1 or 2, it is characterised in that optical fiber is in 1550nm wavelength
Place is less than or equal to 0.25dB, for surrounding 10 millimeters for the bending added losses around 15 millimeters of bending radius around 10 circles
Bending radius is less than or equal to 0.75dB around the bending added losses of 1 circle.
8. low decaying bend-insensitive single-mode optical fiber as described in claim 1 or 2, it is characterised in that optical fiber is in 1625nm wavelength
Place, it is curved for surrounding 10 millimeters for being less than or equal to 1.0dB around the bending added losses of 10 circles around 15 millimeters of bending radius
Bilge radius is less than or equal to 1.5dB around the bending added losses of 1 circle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020167398A1 (en) * | 2019-02-11 | 2020-08-20 | Corning Incorporated | Optical fibers for single mode and few mode vcsel-based optical fiber transmission systems |
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| CN105676349B (en) * | 2016-04-06 | 2017-11-07 | 武汉邮电科学研究院 | The single-mode fiber of resistance to irradiation of bend-insensitive |
| CN105911639B (en) * | 2016-05-24 | 2019-04-16 | 长飞光纤光缆股份有限公司 | A kind of low decaying single mode optical fiber |
| CN109358391B (en) * | 2018-06-06 | 2020-10-02 | 长飞光纤光缆股份有限公司 | Single-mode coupling optical fiber with low macrobend loss |
| CN110780378A (en) * | 2019-11-13 | 2020-02-11 | 北京交通大学 | Multilayer refractive index gully gradient optical fiber leaking high-order mode |
| CN112987169A (en) * | 2019-12-02 | 2021-06-18 | 中国移动通信有限公司研究院 | Optical fiber |
| CN111273394B (en) * | 2020-03-27 | 2022-03-25 | 长飞光纤光缆股份有限公司 | Multi-core multimode optical fiber |
| CN113608298B (en) * | 2021-10-11 | 2021-12-31 | 长飞光纤光缆股份有限公司 | Large-mode-field-diameter bending insensitive single-mode fiber |
| CN114994830A (en) * | 2022-06-14 | 2022-09-02 | 江苏亨通光导新材料有限公司 | Low-loss bending-resistant single-mode optical fiber and manufacturing method thereof |
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