CN109557610A - A kind of bend-insensitive multimode fibre - Google Patents
A kind of bend-insensitive multimode fibre Download PDFInfo
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- CN109557610A CN109557610A CN201710892807.4A CN201710892807A CN109557610A CN 109557610 A CN109557610 A CN 109557610A CN 201710892807 A CN201710892807 A CN 201710892807A CN 109557610 A CN109557610 A CN 109557610A
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- graded bedding
- multimode fibre
- bend
- podium level
- range
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Classifications
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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
- G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
-
- 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
-
- 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
- G02B6/0286—Combination of graded index in the central core segment and a graded index layer external to the central core segment
-
- 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
- G02B6/03622—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 2 layers only
Abstract
The present invention provides a kind of bend-insensitive multimode fibre, including the graded bedding, podium level and depressed cladding set gradually from inside to outside.Graded bedding and podium level collectively form multimode fibre sandwich layer, and the refractive index profile of graded bedding is parabolic, and refractive index profile profile exponent is α, and the refractive index at graded bedding center is n0, the refractive index of podium level is n1, the refractive index of depressed cladding is n2.The refringence at graded bedding center is 0.0095~0.014, and the refringence of podium level is -0.002~0.003, and the refringence of depressed cladding is -0.0065~-0.002.The refringence of the mutually more typical bend-insensitive multimode fibre of overall refractive index difference of bend-insensitive multimode fibre of the invention is remarkably decreased.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of low-loss bend-insensitive multimode fibres.
Background technique
In fiber optic communication systems, transmission medium of the optical fiber as light wave, characteristic have the laser propagation effect of optical signal non-
Often important influence.The loss of legacy multimode fiber is increased rapidly with the reduction of bending radius, is caused in different application ring
Transmission bandwidth and the very big uncertainty of limited transmission distance under border.Bend-insensitive multimode fibre is in different bending radius items
Bending loss does not change substantially under part, is widely used in data center, municipal office center with its excellent bending property and deposits
Store up the fields such as regional network.In addition, in some special occasions, such as in oil/gas well, mine hole, high-tension cable, seabed detection, also need
Want the multimode fibre of bend-insensitive for sensing and data transfer.
Traditional multimode fibre mixes GeO using sandwich layer2(germanium dioxide), the design of the pure quartz of outsourcing covering, mixes GeO2It measures
Certainly in the requirement of the refringence (numerical aperture) of fiber core and outsourcing covering.Influencing the main factor that multimode fibre is decayed is
GeO2Rayleigh scattering caused by adulterating, for mixing GeO2Caused quartz glass Rayleigh scattering can be indicated with formula (1):
Wherein, λ is wavelength, A0For the rayleigh scattering coefficient undoped with pure silicon dioxide, ΔiFor i-th layer of covering and sandwich layer it
Between relative fefractive index difference, ΓiFor i-th layer of power confinement factor.By the study found that optical fiber Rayleigh scattering loss size
With mix GeO2Caused relative fefractive index difference is directly proportional, that is, mixes GeO2Content it is higher, Rayleigh scattering loss is bigger.Therefore, it reduces
GeO2Content is to reduce the very effective approach of multimode fibre decaying.In addition, highly doped GeO2The increasing of multimode fibre dispersion can also be caused
Add, directly affects the bandwidth of multimode fibre transmission.
Existing typical bend-insensitive multimode fibre highest (core centre) and minimum (concave bottom) refringence are about
0.021, if it is desired to which GeO is mixed by reduction light sandwich layer2Concentration reduces optical fiber attenuation, in order to keep above-mentioned refringence,
The refractive index of covering and depressed section must be reduced simultaneously.Currently, the main stream approach for reducing quartzy refractive index mixes F in quartz
(fluorine).Scattering loss caused by order to adulterate is preferably minimized, and optimal design is that fibre core does not mix GeO2, i.e. pure silicon core sets
Meter, the simple covering of the design requirement and silica refractive index difference are reduced to -0.015, more for typical bend-insensitive
Mode fiber design, also needs the design being recessed, and the refringence of sagging covering and silica must reach -0.021 at this time,
The limit that F is mixed close to quartz will greatly improve manufacture difficulty and manufacturing cost.
Summary of the invention
In view of the above situation, it is necessary to which a kind of bend-insensitive multimode fibre to solve the above problems is provided.
The present invention provides a kind of bend-insensitive multimode fibre, including graded bedding, the podium level set gradually from inside to outside
And depressed cladding, graded bedding and podium level collectively form multimode fibre sandwich layer.The refractive index profile of graded bedding is parabolic,
Refractive index profile profile exponent is α, and the refractive index at graded bedding center is n0, the refractive index of podium level is n1, the refraction of depressed cladding
Rate is n2.The refringence at graded bedding center is 0.0095~0.014, and the refringence of podium level is -0.002~0.003, recessed
The refringence for falling into covering is -0.0065~-0.002.
The mutually more typical bend-insensitive multimode of overall refractive index difference of bend-insensitive multimode fibre provided by the invention
The refringence of optical fiber is remarkably decreased.
Detailed description of the invention
Fig. 1 is the refractive index profile schematic diagram for the bend-insensitive multimode fibre that one embodiment of the invention provides.
Specific embodiment
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar application, therefore the present invention is not limited by the specific embodiments disclosed below.
It should be noted that the refringence in the present invention refers to the refractive index of each corresponding part in optical fiber with respect to dioxy
The difference of the refractive index of SiClx.
The present invention provides a kind of bend-insensitive multimode fibre comprising graded bedding, the platform set gradually from inside to outside
Layer and depressed cladding.The graded bedding, podium level and depressed cladding coaxial arrangement.Wherein, the graded bedding and described
Podium level collectively forms the sandwich layer of the multimode fibre.
Referring to Fig. 1, Fig. 1 is the refractive index profile schematic diagram of the multimode fibre.The radius of the graded bedding is R1,
Refractive index profile is parabolic, and refractive index profile distribution parameter is α, and the refractive index at the graded bedding center is n0.It is described
The radius of podium level is R2, width R2-R1, refractive index n1.The radius of the depressed cladding is R3, width R3-
R2, refractive index n2.Specifically, the distribution of the refractive index of the multimode fibre meets following formula:
Wherein, r is the radial distance of central axis of any point apart from the graded bedding in the multimode fibre, and Δ is gradual change
The boundary relative fefractive index difference at layer center and graded bedding:
Specifically, the refringence range at the graded bedding center is 0.0095~0.014, i.e. the refraction at graded bedding center
The range of the refractive index difference of rate versus-silica is 0.0095~0.014.The radius R of the graded bedding1Range be 22~
32μm.The refractive index profile profile parameter of the graded bedding is 1.7~2.2.The width R of the podium level2-R1Range is 0.5
~5 μm.The refringence range of the podium level is -0.002~0.003.The width R of the depressed cladding3-R2Range is greater than
Or it is equal to 20 μm.The refringence range of the depressed cladding is -0.0065~-0.002.
The graded bedding and the podium level are doped with GeO2(germanium dioxide) and P2O5It (phosphorus pentoxide) or mixes
It is miscellaneous to have GeO2With F (fluorine), the depressed cladding is doped with F.The molar concentration of the dopant presses following letter with radius change
Number distribution:
Wherein, MrFor molar concentration of the dopant at the radial distance r apart from the graded bedding central axis, M0For
Molar concentration of the dopant at the graded bedding center, M1It is the dopant in the graded bedding boundary and podium level
Molar concentration, M2It is the dopant in the molar concentration of the depressed cladding, β is that the concentration distribution of the dopant is joined
Number.
Specifically, GeO2The graded bedding center molar concentration range be 0~10%, the graded bedding boundary with
And the molar concentration range of podium level is 0~1%, and the GeO2Concentration distribution parameter betaGRange be 1.5~3.P2O5?
The molar concentration range at the graded bedding center is 0~10%, in the graded bedding boundary and the molar concentration model of podium level
Enclosing is 0~1%, and the P2O5Concentration distribution parameter betaPRange be 1.5~3.F is mole dense the graded bedding center
Spending range is 0~1%, is 0~2.5% in the molar concentration range of the graded bedding boundary and podium level, and the F's is dense
Spend distribution parameter βFRange be 3~5.F is 1~6% in the molar concentration range of the depressed cladding.
It is understood that in other embodiments, the multimode fibre further includes outsourcing covering, the outsourcing covering set
On the depressed cladding, radius Rmax, width Rmax-R3, refractive index nc.The outsourcing covering is pure stone
English glass,At this point, the refringence at the graded bedding center can be expressed as n0-nc, the refraction of the podium level
Rate difference can be expressed as n1-nc, the refringence of the depressed cladding can be expressed as n2-nc.Specifically, the half of the outsourcing covering
Diameter RmaxIt is 40~100 μm.
Embodiment one
The refringence at the graded bedding center is 0.0095, and the radius R of the graded bedding1It is 24 μm；The platform
The refringence of layer is -0.002, radius R2It is 25 μm；The refringence of the depressed cladding is -0.0065, radius R3For
48μm.Multimode fibre in the present embodiment further includes radius RmaxFor 62.5 μm of outsourcing covering.Wherein, the graded bedding and
Podium level is doped with GeO2And F, the GeO of the graded bedding center doping2Molar concentration be 8.1%, the F's of doping is mole dense
Degree is 0.5%；The GeO adulterated in the graded bedding boundary and the podium level2Molar concentration be 0.6%, the F's of doping
Molar concentration is 2.2%.The F that the depressed cladding is 5.2% doped with molar concentration.The dispersion of the multimode fibre of the present embodiment
For -93.1ps/ (nmkm).It is pre- that the preparation of plasma chemical vapor deposition (PCVD) technique can be used in the multimode fibre of the present embodiment
Stick processed.
Embodiment two
The refringence at the graded bedding center is 0.0105, and the radius R of the graded bedding1It is 23.5 μm；It is described flat
The refringence of platform layer is 0.0005, radius R2It is 25 μm；The refringence of the depressed cladding is -0.0055, radius R3
It is 46 μm.Multimode fibre in the present embodiment further includes radius RmaxFor 62.5 μm of outsourcing covering.Wherein, the graded bedding with
And podium level is doped with GeO2And P2O5, the GeO of the graded bedding center doping2Molar concentration be 7.9%, the P of doping2O5's
Molar concentration is 0.7%；The GeO adulterated in the graded bedding boundary and the podium level2Molar concentration be 0.01%, mix
Miscellaneous P2O5Molar concentration be 0.5%.The F that the depressed cladding is 4.45% doped with molar concentration.The multimode of the present embodiment
The dispersion of optical fiber is -93.2ps/ (nmkm).The chemical vapor deposition (MCVD) of improvement can be used in the multimode fibre of the present embodiment
Technique prepares prefabricated rods.
Embodiment three
The refringence at the graded bedding center is 0.0105, and the radius R of the graded bedding1It is 23.5 μm；It is described flat
The refringence of platform layer is 0.0005, radius R2It is 25 μm；The refringence of the depressed cladding is -0.0055, radius R3
It is 62.5 μm.Wherein, the graded bedding and podium level are doped with GeO2And P2O5, the GeO of the graded bedding center doping2's
Molar concentration is 1.4%, the P of doping2O5Molar concentration be 8.5%；It is adulterated in the graded bedding boundary and the podium level
GeO2Molar concentration be 0.1%, the P of doping2O5Molar concentration be 0.2%.The depressed cladding is doped with molar concentration
For 4.45% F.The dispersion of the multimode fibre of the present embodiment is -87.9ps/ (nmkm).The multimode fibre of the present embodiment can be adopted
Prefabricated rods are prepared with chemical vapor deposition (MCVD) technique and fluorine doped casing of improvement.
Example IV
The refringence at the graded bedding center is 0.014, and the radius R of the graded bedding1It is 22.8 μm；The platform
The refringence of layer is 0.003, radius R2It is 25 μm；The refringence of the depressed cladding is -0.002, radius R3For
62.5μm.Wherein, the graded bedding and podium level are doped with GeO2And F, the GeO of the graded bedding center doping2It is mole dense
Degree is 11.6%, and the molar concentration of the F of doping is 0.5%；The GeO adulterated in the graded bedding boundary and the podium level2
Molar concentration be 2.9%, the molar concentration of the F of doping is 0.5%.The depressed cladding is 1.6% doped with molar concentration
F.The dispersion of the multimode fibre of the present embodiment is -96.8ps/ (nmkm).External gas can be used in the multimode fibre of the present embodiment
Phase sedimentation (OVD) technique and fluorine doped casing prepare prefabricated rods.
Bend-insensitive multimode fibre provided in an embodiment of the present invention, by adulterating more F in depressed cladding, (doping rubs
Your concentration is 1~6%), reduce GeO in graded bedding2Doping concentration (doping molar concentration be 0~11.5%) so that described
Multimode fibre is while its refractive index profile optimizes, the whole mutually more typical bend-insensitive multimode fibre of refringence
Refringence be remarkably decreased, wherein the refringence of depressed cladding be -0.0065~-0.002.Simultaneously by reducing F to the greatest extent
Doping, to reduce GeO2Scattering loss caused by adulterating, to reduce the totality of the bend-insensitive multimode fibre
Loss.
Embodiment of above is only used to illustrate the technical scheme of the present invention and not to limit it, although referring to the above preferable embodiment party
Formula describes the invention in detail, those skilled in the art should understand that, it can be to technical solution of the present invention
It modifies or equivalent replacement should not all be detached from the spirit and scope of technical solution of the present invention.
Claims (10)
1. a kind of bend-insensitive multimode fibre, including the graded bedding, podium level and depressed cladding set gradually from inside to outside,
The graded bedding and the podium level collectively form multimode fibre sandwich layer, and the refractive index profile of the graded bedding is parabolic,
The refractive index at graded bedding center is n0, the refractive index of the podium level is n1, the refractive index of the depressed cladding is n2, feature
Be: the refringence at the graded bedding center is 0.0095~0.014, the refringence of the podium level is -0.002~
0.003, the refringence of the depressed cladding is -0.0065~-0.002.
2. bend-insensitive multimode fibre as described in claim 1, it is characterised in that:
The radius R of the graded bedding1Range be 22~32 μm；
The radius of the podium level is R2, the width R of the podium level2-R1Range be 0.5~5 μm；
The radius of the depressed cladding is R3, the width R of the depressed cladding3-R2More than or equal to 20 μm.
3. bend-insensitive multimode fibre as described in claim 1, it is characterised in that: the graded bedding and the podium level
Doped with GeO2With P2O5Or doped with GeO2With F, the depressed cladding doped with F, wherein the molar concentration of dopant with
Radius change, and be distributed by such as minor function:
Wherein, MrFor molar concentration of the dopant at the radial distance r apart from the graded bedding central axis, M0It is described
Molar concentration of the dopant at the graded bedding center, M1For the dopant rubbing in the graded bedding boundary and podium level
That concentration, M2It is the dopant in the molar concentration of the depressed cladding, β is the concentration distribution parameter of the dopant.
4. bend-insensitive multimode fibre as claimed in claim 3, which is characterized in that GeO2In rubbing for the graded bedding center
Your concentration range is 0~11.5%, GeO2The molar concentration range of the graded bedding boundary and the podium level be 0~
3.5%, and GeO2Concentration distribution parameter betaGRange be 1.5~3.
5. bend-insensitive multimode fibre as claimed in claim 3, which is characterized in that P2O5At the fine graded bedding center
Molar concentration range is 0~10%, P2O5It is 0~1% in the molar concentration range of the graded bedding boundary and podium level, and
P2O5Concentration distribution parameter betaPRange be 1.5~3.
6. bend-insensitive multimode fibre as claimed in claim 3, which is characterized in that mole of the F at the graded bedding center
It in the molar concentration range of the graded bedding boundary and podium level is 0~2.5% that concentration range, which is 0~1%, F, and F's is dense
Spend distribution parameter βFRange be 3~5.
7. bend-insensitive multimode fibre as claimed in claim 3, which is characterized in that F is mole dense the depressed cladding
Spending range is 1~6%.
8. bend-insensitive multimode fibre as described in claim 1, which is characterized in that the multimode fibre further includes being sheathed on
Outsourcing covering on the depressed cladding, the outsourcing covering are pure quartz glass.
9. bend-insensitive multimode fibre as claimed in claim 8, which is characterized in that the range of the radius of the outsourcing covering
It is 40~100 μm.
10. bend-insensitive multimode fibre as described in claim 1, which is characterized in that the refractive index of the graded bedding is by such as
Minor function distribution:
Wherein, R1For the radius of the graded bedding, the range of refractive index profile profile parameter is 1.7~2.2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021189891A1 (en) * | 2020-03-27 | 2021-09-30 | 长飞光纤光缆股份有限公司 | Multi-core multi-mode optical fiber |
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| CN106094104A (en) * | 2016-06-22 | 2016-11-09 | 长飞光纤光缆股份有限公司 | A kind of bend-insensitive multimode fibre and manufacture method thereof |
| CN106707407A (en) * | 2016-12-30 | 2017-05-24 | 中天科技精密材料有限公司 | Wideband semi-step type multimode optical fiber |
| CN106842419A (en) * | 2016-12-30 | 2017-06-13 | 中天科技精密材料有限公司 | A kind of broadband bend-insensitive multimode fibre |
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|---|---|---|---|---|
| JP5461384B2 (en) * | 2010-12-28 | 2014-04-02 | 株式会社フジクラ | Low bending loss multimode fiber |
| CN104185804A (en) * | 2012-01-12 | 2014-12-03 | 康宁股份有限公司 | Few mode optical fibers for er doped amplifiers, and amplifiers using such |
| CN104360435A (en) * | 2014-08-25 | 2015-02-18 | 长飞光纤光缆股份有限公司 | Bend-insensitive multimode fiber |
| CN106094104A (en) * | 2016-06-22 | 2016-11-09 | 长飞光纤光缆股份有限公司 | A kind of bend-insensitive multimode fibre and manufacture method thereof |
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