CN110488411A - A kind of counter-bending single mode optical fiber - Google Patents
A kind of counter-bending single mode optical fiber Download PDFInfo
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- CN110488411A CN110488411A CN201910762937.5A CN201910762937A CN110488411A CN 110488411 A CN110488411 A CN 110488411A CN 201910762937 A CN201910762937 A CN 201910762937A CN 110488411 A CN110488411 A CN 110488411A
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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
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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
- G02B6/03683—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 - - + +
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
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Abstract
The present invention relates to a kind of counter-bending single mode optical fibers, it include sandwich layer and covering, it is characterized in that core refractive rate is parabolic distribution, profile exponent α is 2.2~2.5, sandwich layer diameter 2R1 is 7.2 μm~8.2 μm, sandwich layer highest point relative fefractive index difference Δ 1max is 0.360%~0.450%, covering includes inner cladding from the inside to the outside, sink covering, assist sink covering and surrounding layer, inner cladding diameter 2R2 is 16.0 μm~19.0 μm, Δ 2 is -0.06%~0.00%, the cladding diameter 2R3 that sink is 29.0 μm~34.0 μm, Δ 3 is -0.30%~-0.50%, assist sinking cladding diameter 2R4 as 34.0~48.0um, Δ 4 is -0.14%~-0.08%, outside Covering is pure silicon dioxide surrounding layer.The present invention passes through two layers of sagging cladding index depth and width of optimization, preferably limit basic mode leak case under bending state, so that optical fiber has preferable bending property under small-bend radius and long radius, and optical fiber is also preferable in the bending resistance of long wave strong point, meets upgrade requirement of the next generation PON to long wavelength's evolution.
Description
Technical field
The present invention relates to a kind of counter-bending single mode optical fiber for optic communication Transmission system, which has excellent bending resistance
Qu Xingneng belongs to optic communication technical field of access networks.
Background technique
With the continuous development of optical fiber transmission technique, fiber to the home and fiber to the desk are built at communication access net network
If important development direction.Optical fiber as transmission medium plays the part of vital role wherein.Due in practical FTTx light
In fine track laying and configuration process, it is often necessary to various operations are carried out to optical fiber indoors and under narrow environment, as corner is straight
The installation of angle corner, it is tediously long to handle optical fiber in the storage box increasingly minimized for Optical Fiber Winding, it is therefore desirable to which design is opened
Send out have excellent bending resistance optical fiber, with meet FTTx network laying and device miniaturization requirement, it is counter-bending G.657
In series fibre, meeting minimum bending radius is the G.657.A1 fiber optic applications of 10mm in long-range net (long-haul
networks)；G.657.A2 optical fiber meets the application under the conditions of minimum 7.5mm bending radius, is mainly used for Metropolitan Area Network (MAN)
(metro networks) and FTTH (fiber to the home)；G.657.B3 optical fiber meets the use condition under minimum 5mm bending radius,
Mainly in the use of FTTd (fiber to the desk) and all-optical network.
According to the regulation and the G.657.B3 specific use environment of optical fiber and condition of ITU-T, G.657.B3 optical fiber makes substantially
For more focusing on the macrobending performance under small-bend radius (minimum bending radius 5.0mm) in short-range communications,
Compatible G.652.D standard is not strictly required.The ITU-T of in September, 2012 is G.657 in latest revised version, and B type optical fiber is gradually to simultaneous
The direction for holding G.652 optical fiber is developed, this would be even more beneficial to the popularization and use of G.657 optical fiber.Therefore in design bend insensitive fiber
While, it is necessary to consider G.652 compatible with tradition.
By years of researches, various countries scientific research personnel has found that the mode field diameter of optical fiber and cutoff wavelength are curved to the macroscopic view of optical fiber
Song loss play a major role, MAC value can qualitatively measure the bending property of optical fiber, wherein MAC value be defined as mode field diameter with
The ratio of cutoff wavelength, MAC value is smaller, then the bending property of optical fiber is better, it is clear that reduces mode field diameter, increases optical fiber and cut
Only wavelength can achieve the purpose that reduce MAC value, to obtain preferable bending property.But fibre-optic mode field diameter is too small, then exists
Biggish connecting loss can be brought when it connect with Standard single-mode fiber, and has been restricted to launched power.Simultaneously, it is contemplated that
The multi-service feature of FTTx, it would be desirable to be transmitted using all band, cable cut-off wavelength is necessarily less than 1260nm, therefore optical fiber
Cutoff wavelength increase space it is very limited.Therefore the method that relying solely on reduces optical fiber MAC value improves bending property effect
It is limited, especially it is difficult to reduce the bending loss under small-bend radius.
Relative to common single mode optical fiber cross-section structure, another the effective method for improving fibre-optical bending performance is to use
The design of sagging inner cladding can increase the numerical aperture of optical fiber by inner cladding design of sinking in the case where not increasing sandwich layer and adulterating
Diameter (NA) can avoid decaying caused by increasing doping and increase.But the optimization design for the covering that sink, it can only change to a certain extent
Kind macrobend performance of the optical fiber under long radius.When the bending radius of optical fiber is less than or equal to 10mm, it is difficult with sagging
The method of inner cladding is prepared with the optical fiber compared with low bend loss.
Through further research, it has been found that improving the maximally efficient method of optical fiber bending resistance is using the surrounding layer knot that sink
Structure designs fibre profile.To sagging cladding structure optical fiber the study found that sink depth of the surrounding layer in fibre profile and
Width requires limitation there is also certain: the surrounding layer that sink is excessively shallow, narrow to bring good bend-insensitive performance, and mistake
Shallowly, the wide bending loss that cannot be reduced under small bending radius；It is too deep, it is wide, then may influence optical fiber cutoff wavelength and
Dispersion.In order to enable optical fiber has lower loss under small and big bending radius, the width and depth of the covering that sink
It rationally designs extremely important.
It is sinking in the bend insensitive fiber of cladding structure, another influences optical fiber macrobending in a flexed condition according
The factor of energy is the diameter ratio of optical fiber core covering, and lesser sandwich layer/cladding diameter ratio is to be conducive to improve fibre-optical bending performance.But
It is MFD and dispersion of the lesser sandwich layer/cladding diameter than will also tend to influence optical fiber, and is matching in drawing process
Viscosity and stress are also more difficult, so suitable sandwich layer/cladding diameter ratio is also that bend insensitive fiber Section Design is in need of consideration
One emphasis.
Chinese patent CN105334570 describes a kind of bend-insensitive single-mode optical fiber, and sandwich layer is distributed using α, and is arranged
Sagging covering.But it is found that its sandwich layer is relatively large in diameter, covering depth of sinking is shallower, can only support the bending of minimum 10mm
Application demand under radius, typically loss is 0.3dB under 10mm bending radius at 1550nm wavelength, it is anticipated that smaller curved
Big bending loss will be generated under bilge radius, which has limited its application scenarios, are not able to satisfy the wiring of indoor complex condition
And its miniaturized device demand.
Chinese patent CN200710096317.X describes a kind of bend-insensitive single-mode optical fiber, is provided with two layers of packet that sink
Layer, the first sagging covering fluorine doped is deeper, and the second sagging covering fluorine doped is shallower, is provided with tundish between this two layers sagging covering
Layer.Using the structure to reduce bending loss, while the optical fiber prepared also complies with G.652 standard, but it is typically only suitable for
Use demand under 7.5mm bending radius does not provide the bending loss embodiment of 5.0mm bending radius and specific in the patent
Parameter.Simultaneously it can be seen that the radius of the intermediate cladding layer of refractive index profile is in 18um-20um, and the second of fluorine doped the sagging covering is more
Width reaches 25um-40um, and the accounting of fluorine doped layer in a fiber is significantly higher, the sagging covering of the multilayer of design and intermediate cladding layer knot
Structure is complicated, is unfavorable for its large-scale production and practical application.
As FTTx is continued to develop, Future Access Network system proposes new challenge to optical fiber, environment complexity of registering one's residence, different
The bending situation of the radius of size can all occur, therefore need to consider small-bend radius and big bending simultaneously when designing optical fiber
Loss problem under radius.Next-generation PON long wavelength's window need to be guaranteed using inevitable (1570nm or even 1610nm)
Small bending radius fiber optic network is unimpeded, therefore the bending resistance that optical fiber is grown in long wave is also critically important.
Summary of the invention
The content of present invention is introduced for convenience, defines part term:
Prefabricated rods: meeting fiber design requirement by the radial refractive index distribution that sandwich layer and covering form can directly be drawn into
The glass bar or assembly of designed optical fiber；
Plug: the 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: the relationship between optical fiber or preform (including plug) glass refraction and its radius；
Relative fefractive index difference:niAnd n0It is respectively each right
Answer the refractive index of optical fiber each section and the refractive index of surrounding layer pure silicon dioxide glass；
Core refractive rate meets power exponent distribution:
Wherein, n0For the refractive index of sandwich layer center, r is the distance of distance center position, a
For the radius of fiber core layer, Δ 0 is the refractive index of the glass of core center and surrounding layer pure silicon dioxide；
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): relative index of refraction difference (Δ of germanium (Ge) quartz glass relative to pure quartz glass is mixed
Ge), measured with this to indicate to mix germanium (Ge)；
Mixing germanium can be improved the refractive index of silica, and fluorine doped can reduce the refractive index of silica；
Bushing pipe (Tube): the substrate tube of tubulose meets the pure quartz glass pipe of certain geometry requirement；
PCVD technique: the quartz glass of thickness required for being prepared with plasma activated chemical vapour deposition technique；
OVD technique: with the quartz glass of Outside Vapor deposition and sintering process preparation required thickness；
VAD technique: with the quartz glass of axial vapor deposition and sintering process preparation required thickness；
APVD over cladding process: natural or synthetic silica flour is melted with high-frequency plasma flame and prepares institute in mandrel surface
Need the SiO of thickness2Glass；
The glass part of optical fiber refers to the glass fiber that coat is free of in optical fiber；
The summation of material dispersion and waveguide dispersion that the dispersion of optical fiber refers to；
Macrobend added losses test method method with reference to specified in IEC60793-1-47.
Technical problem to be solved by the present invention lies in propose a kind of section in view of the deficiency of the prior art
The counter-bending single mode optical fiber of structure optimization, which has very low bending loss under lesser bending radius, while also increasing
The strong anti-bending strength of long wave strong point optical fiber.
The present invention be solve the problems, such as it is set forth above used by technical solution are as follows: include sandwich layer and covering, feature
It is that the core refractive rate is parabolic distribution, for profile exponent α 2.2~2.5, sandwich layer diameter 2R1 is 7.2 μm~8.2 μ
M, sandwich layer highest point relative fefractive index difference Δ 1max are 0.360%~0.450%, and the covering includes interior packet from the inside to the outside
Layer, assists sink covering and surrounding layer at sagging covering, and wherein inner cladding wraps sandwich layer, and sink covering wrapping inner cladding, under auxiliary
It falls into covering and wraps the covering that sink, surrounding layer wrapping assists the covering that sink, and the inner cladding diameter 2R2 is 16.0 μm~19.0 μ
M, relative fefractive index difference Δ 2 are -0.06%~0.00%, and the sagging cladding diameter 2R3 is 29.0 μm~34.0 μm, relatively
Refractive indices 3 are -0.30%~-0.50%, and the auxiliary sink cladding diameter 2R4 for 34.0~48.0um, are rolled over relatively
Penetrating rate difference Δ 4 is -0.14%~-0.08%, and the surrounding layer is pure silicon dioxide surrounding layer.
According to the above scheme, the sandwich layer is the silica glass layer that germanium and fluorine are co-doped with, and wherein Fluorin doped concentration is constant,
Ge-doped concentration increases with radius and successively decreases and obtain the refractive index of parabolic distribution.
According to the above scheme, the optical fiber inner cladding is the silica glass layer that germanium and fluorine are co-doped with.
According to the above scheme, the sagging covering and the sagging covering of auxiliary are the silica glass layer of fluorine doped.
According to the above scheme, mode field diameter of the optical fiber at 1310nm wavelength is 8.2~9.0um.
According to the above scheme, the optical fiber has the cable cut-off wavelength less than or equal to 1260nm.
According to the above scheme, the optical fiber has the zero-dispersion wavelength of 1300~1324nm.
According to the above scheme, the optical fiber is at 1550nm wavelength, for additional around the bending of 1 circle around 10mm bending radius
Loss is less than or equal to 0.02dB；It is less than or equal to 0.06dB around the bending added losses of 1 circle for enclosing 7.5mm bending radius；
0.13dB is less than or equal to for the bending added losses around 5.0mm bending radius around 1 circle.
According to the above scheme, the optical fiber is at 1625nm wavelength, for additional around the bending of 1 circle around 10mm bending radius
Loss is less than or equal to 0.05dB；Bending added losses around 7.5mm bending radius around 1 circle are less than or equal to
0.17dB；0.30dB is less than or equal to for the bending added losses around 5.0mm bending radius around 1 circle.
According to the above scheme, the optical fiber is under 10mm, 7.5mm, 5.0mm bending radius around 1 circle, 1625nm and 1550nm wave
Strong point added losses ratio is less than or equal to 2.8, and optimum condition is less than or equal to 2.5.
The beneficial effects of the present invention are: 1. devise the optical fiber of double sagging cladding structures, a deeper sagging covering
A shallower sagging covering is matched, by optimizing two layers of sagging cladding index depth and width, is guaranteeing fiber cutoff wave
In the case where long and dispersion characteristics, basic mode leak case under bending state is preferably limited, so that optical fiber is in small-bend radius
With have preferable bending property under long radius, and optical fiber is also preferable in the bending resistance of long wave strong point, meets next
For PON to the upgrade requirement of long wavelength's evolution；2. core refractive rate section uses parabolic distribution, reduces and rolled under bending state
Rate Profile distortion degree is penetrated, the bending resistance of optical fiber is further increased；3. sandwich layer and inner cladding are two that germanium and fluorine are co-doped with
Silica glass, and parabolic grades are presented in sandwich layer germania concentration, have advanced optimized the matching of core packet viscosity, have reduced wire drawing
The generation of defect in journey, enhances the Mechanical Reliability of optical fiber；4. optical fiber of the invention is curved 5mm's, 7.5mm and 10.0mm
Lower bending loss is all had under bilge radius, has taken into account small-bend radius and long radius use condition, meets access net
The demand of complicated wiring environment and some miniaturization optical devices；5. preferred fiber of the present invention meet G.657.A/B while,
Compatible G.652 optical fiber.
Detailed description of the invention
Fig. 1 is the Refractive Index Profile of Optical schematic diagram of one embodiment of the invention.
Fig. 2 is the optical fiber radial section structural schematic diagram of one embodiment of the invention.
Fig. 3 is the bending loss curve graph at optical fiber different wave length of the invention.
Specific embodiment
Detailed embodiment is presented below, the invention will be further described.
Optical fiber includes core layer, inner cladding, the covering that sink, assists sink covering and surrounding layer, the core refractive
Rate is parabolic distribution, and profile exponent α, sandwich layer diameter is 2R1, and sandwich layer highest point relative fefractive index difference is Δ 1max, described
Inner cladding diameter be 2R2, relative fefractive index difference be Δ 2, the sagging cladding diameter be 2R3, relative fefractive index difference is Δ
3, the auxiliary sink cladding diameter for 2R4, and relative fefractive index difference is Δ 4, and the surrounding layer 100 is outside pure silicon dioxide
Covering, diameter are 125 μm.
According to the technical solution of above-mentioned bend resistant single moded fibers, the parameter of optical fiber is set in the range of its defined
Meter manufactures plug by plugs manufacturing process such as vapor depositions, the system of entire prefabricated rods is completed by over cladding process such as OVD
It makes.Profile exponent α is 2.4 in embodiment, and the major parameter of the refractive index profile structure of optical fiber is as shown in table 1, prepared light
Fine part Specifeca tion speeification is as shown in table 2.
Table 1: Refractive Index Profile of Optical parameter
Table 2: the Specifeca tion speeification of optical fiber
Claims (10)
1. a kind of counter-bending single mode optical fiber, includes sandwich layer and covering, it is characterised in that the core refractive rate is parabola
Distribution, profile exponent α is 2.2~2.5, and sandwich layer diameter 2R1 is 7.2 μm~8.2 μm, sandwich layer highest point relative fefractive index difference Δ
1max is 0.360%~0.450%, and the covering includes inner cladding, the covering that sink from the inside to the outside, assist sinking covering and outer
Covering, wherein inner cladding wraps sandwich layer, and the covering that sink wraps inner cladding, and sagging covering is assisted to wrap the covering that sink, surrounding layer packet
Around assist sink covering, the inner cladding diameter 2R2 be 16.0 μm~19.0 μm, relative fefractive index difference Δ 2 be -0.06%~
0.00%, the sagging cladding diameter 2R3 be 29.0 μm~34.0 μm, relative fefractive index difference Δ 3 be -0.30%~-
0.50%, the auxiliary sink cladding diameter 2R4 be 34.0~48.0um, relative fefractive index difference Δ 4 be -0.14%~-
0.08%, the surrounding layer is pure silicon dioxide surrounding layer.
2. counter-bending single mode optical fiber according to claim 1, it is characterised in that the sandwich layer is the dioxy that germanium and fluorine are co-doped with
SiClx glassy layer, wherein Fluorin doped concentration is constant, and Ge-doped concentration increases with radius and successively decreases and obtain the refraction of parabolic distribution
Rate.
3. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber inner cladding is that germanium and fluorine are total
The silica glass layer mixed.
4. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the sagging covering and auxiliary, which sink, to be wrapped
Layer is the silica glass layer of fluorine doped.
5. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that mould of the optical fiber at 1310nm wavelength
Field diameter is 8.2~9.0um.
6. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber, which has, to be less than or equal to
The cable cut-off wavelength of 1260nm.
7. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber is with 1300~1324nm's
Zero-dispersion wavelength.
8. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber is right at 1550nm wavelength
It is less than or equal to 0.02dB in the bending added losses around 10mm bending radius around 1 circle；For enclosing 7.5mm bending radius around 1
The bending added losses of circle are less than or equal to 0.06dB；Bending added losses around 5.0mm bending radius around 1 circle are less than
Or it is equal to 0.13dB.
9. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber is right at 1625nm wavelength
It is less than or equal to 0.05dB in the bending added losses around 10mm bending radius around 1 circle；For around 7.5mm bending radius around
The bending added losses of 1 circle are less than or equal to 0.17dB；For small around the bending added losses of 1 circle around 5.0mm bending radius
In or equal to 0.30dB.
10. counter-bending single mode optical fiber as described in claim 1 or 2, it is characterised in that the optical fiber 10mm, 7.5mm,
Added losses ratio is less than or equal to 2.8 at 1 circle, 1625nm and 1550nm wavelength under 5.0mm bending radius.
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| WO2021109940A1 (en) * | 2019-12-02 | 2021-06-10 | 中国移动通信有限公司研究院 | Optical fiber |
| WO2021218094A1 (en) * | 2020-04-26 | 2021-11-04 | 中天科技光纤有限公司 | Optical fiber |
| EP4254027A1 (en) * | 2022-03-28 | 2023-10-04 | Sterlite Technologies Limited | Optical fibers with improved bend performance and manufacturing method thereof |
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| EP4254027A1 (en) * | 2022-03-28 | 2023-10-04 | Sterlite Technologies Limited | Optical fibers with improved bend performance and manufacturing method thereof |
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| CN110488411B (en) | 2021-03-23 |
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