CN206235757U - A kind of new less fundamental mode optical fibre - Google Patents
A kind of new less fundamental mode optical fibre Download PDFInfo
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- CN206235757U CN206235757U CN201621132718.7U CN201621132718U CN206235757U CN 206235757 U CN206235757 U CN 206235757U CN 201621132718 U CN201621132718 U CN 201621132718U CN 206235757 U CN206235757 U CN 206235757U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 121
- 239000000835 fiber Substances 0.000 claims abstract description 68
- 238000005452 bending Methods 0.000 claims abstract description 59
- 238000005253 cladding Methods 0.000 claims abstract description 38
- 230000007547 defect Effects 0.000 claims description 22
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 8
- 238000005859 coupling reaction Methods 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 12
- 238000009826 distribution Methods 0.000 description 12
- 238000004891 communication Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- RGNPBRKPHBKNKX-UHFFFAOYSA-N hexaflumuron Chemical compound C1=C(Cl)C(OC(F)(F)C(F)F)=C(Cl)C=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F RGNPBRKPHBKNKX-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The utility model provides a kind of new less fundamental mode optical fibre, and the optical fiber includes：The covering of fibre core and encirclement fibre core；The covering includes：Surround the first inner cladding of fibre core；Surround the first high index of refraction filter mold layer of the first inner cladding；Surround the second inner cladding that the first high index of refraction filters mold layer；Surround the second high index of refraction filter mold layer of the second inner cladding；Surround the surrounding layer that the second high index of refraction filters mold layer.The utility model provides a kind of bending radius has extremely low bending loss in more than 7.5mm（<1×10‑3 DB/ circles）New less fundamental mode optical fibre solution.In conventional optical communicating waveband（1260 ~ 1625nm wavelength）, the utility model is non-single-mode fiber under straight wave guide state.Bent in sufficiently small bending radius by by optical fiber, make its fibre core high-order mode that close coupling occur with the pattern of high index of refraction filter mold layer, high-order mode can be filtered, so as to realize the purpose of single mode transport.
Description
Technical field
The utility model is related to fiber optic communication field, being capable of single mode operation and optical fiber basic mode more specifically to one kind
New less fundamental mode optical fibre with low bend loss characteristic.
Background technology
In application fields such as Metropolitan Area Network (MAN), LAN, fiber to the home and short-distance and medium-distance communications, for the ease of laying or reducing
Taken up space, it is often necessary to which optical fiber cable works under small-bend radius, and the single-mode fiber of routine cannot meet small bending half
The requirement worked under footpath.To meet the requirement to optical fiber low bend loss, G.657 sonet standard is proposed in the world.Low bending
Loss optical fiber generally helps structure using the core size by reducing optical fiber, introducing cladding structure with groove and using hole
Optical fiber etc. realizes [K.Himeno, S.Matsuo, N.Guan, and A.Wada, " Low-Bending-Loss Single-
Mode Fibers for Fiber-to-the-Home (are used for fiber-to-the-home low bend loss single mode optical fiber), " Journal
of Lightwave Technology,2005,23(11):3494-3499.]。
Although G.657 optical fiber can work under the 7.5mm even bending radius of 5mm, its bending loss is still larger,
Work steady in a long-term under small-bend radius is difficult to, for example G.657B3 optical fiber should be met in 7.5 and 5mm bending radius
Lower bending loss should be respectively smaller than 0.08 and 0.15dB/ circles (1550nm wavelength).Obviously, optical fiber is twined under this small-bend radius
Larger loss can be still produced after several circles, communication system performance is influenceed.
From theory of fiber, for step optical fiber, when normalized frequency is less than 2.405 under operation wavelength, optical fiber is
Single-mode fiber, when normalized frequency is more than 2.405, optical fiber can transmit high-order mode, so as to be non-single-mode fiber.Conventional multi-mode
Or less fundamental mode optical fibre is due to the presence of high-order mode, with serious intermode dispersion problem when flashlight can be caused to transmit in a fiber,
So as to limit the traffic rate and capacity of optical fiber.Therefore, single-mode fiber is still used in optical fiber telecommunications system at present as main
Transmission medium.
If using non-single-mode fiber in fiber optic communication systems, by the refractive index of effectively increase fiber core and covering
Differ to obtain low bend loss transmission, then be connected by the matching with single-mode fiber, [a kind of optical fiber leads to be capable of achieving single mode transport
Letter system, Chinese patent, 201010589018.1, a kind of communication system based on less fundamental mode optical fibre, ZL201210393511.5].
This technology, by the connection with single-mode fiber, suppresses high-order mode by relaxing the limitation to Optical Fiber Transmission pattern quantity
Produce, realize several requirements of low bend loss, single mode transport and low junction loss transmission.However, this method requirement is few
Mode fiber two ends connect single-mode fiber and connection deviation is small, and this allows for its and actually used receives certain limitation.
Therefore, how to provide that one kind can realize single mode transport and optical fiber is wound multi-turn and remains under small-bend radius
The optical fiber for enough keeping low-loss transmission is problem demanding prompt solution at this stage.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of new less fundamental mode optical fibre, the optical fiber can realize single mode
Transmit and keep low-loss transmission under small-bend radius.
To achieve the above object, the utility model provides following technical scheme：
A kind of new less fundamental mode optical fibre, the optical fiber includes：The covering of fibre core and encirclement fibre core, the covering includes：Surround
First inner cladding of fibre core；Surround the first high index of refraction filter mold layer of the first inner cladding；Surround the first high index of refraction filter mold layer
Second inner cladding；Surround the second high index of refraction filter mold layer of the second inner cladding；Surround the surrounding layer that the second high index of refraction filters mold layer.
Wherein, the fibre core, the first inner cladding, the first high index of refraction filter mold layer, the second inner cladding, the filter of the second high index of refraction
The refractive index of mold layer and surrounding layer is respectively n1, n2, n3, n4, n5, n6, meet：n1＞ n3＞ n5>n6, and have n2=n4=n6；
Meet between the fibre core and the first inner cladding：2.405<V<4.4, whereinV represents normalization frequency
Rate, λ0=1625nm, a1Represent the radius of the fibre core；First high index of refraction filters the refractive index n of mold layer3And radial width
a3Meet：1.7<F<3.3, and have V>F, whereinλ0=1625nm；First inner cladding, first
High index of refraction filter mold layer, the second inner cladding, the radial width of the second high index of refraction filter mold layer are respectively a2, a3, a4, a5。
Preferably, in above-mentioned optical fiber, in 1260~1625nm wave-length coverages, the LP of the optical fiber11Effective folding of mould
The rate of penetrating is all higher than the effective refractive index of the covering Defect Modes of the optical fiber.
Preferably, in above-mentioned optical fiber, the refractive index of the first high index of refraction filter mold layer and the second high index of refraction filter mold layer it
Between meet：n3-n5>(a5/2+a4+a3/2)/Rb, Rb=7.5mm.
Preferably, in above-mentioned optical fiber, the first high index of refraction filters the radial width a of mold layer3Mould is filtered with the second high index of refraction
The radial width a of layer5Meet：a3≥a5。
Preferably, in above-mentioned optical fiber, the refractive index n of fibre core1With the refractive index n of surrounding layer6Meet：0.015>n1-n6>
0.007。
Preferably, in above-mentioned optical fiber, the radial width a of the first inner cladding2Meet：7.9μm≥a2≥4.0μm。
Preferably, in above-mentioned optical fiber, the first high index of refraction filters the radial width a of mold layer3Meet：8.5μm≥a3≥3.5μ
m。
Preferably, in above-mentioned optical fiber, the radial width a of the second inner cladding4Meet：4.6μm≥a4≥2.4μm。
Preferably, in above-mentioned optical fiber, the second high index of refraction filters the radial width a of mold layer5Meet：8.5μm≥a5≥3.5μ
m。
Bending loss of the optical fiber in 1550nm wavelength meets：Radius of curvature RbDuring >=7.5mm, LP01Mould bending is damaged
Consumption is less than 1 × 10-3DB/ circles；Radius of curvature RbDuring≤7.5mm, LP11The bending loss of mould is more than 5dB/ circles.
The cutoff wavelength of the optical fiber is more than 1.625 μm.
The beneficial effects of the utility model：The utility model provides a kind of bending radius in more than 7.5mm with extremely low curved
Song loss (<1×10-3DB/ circles) new less fundamental mode optical fibre solution.In conventional optical communicating waveband (1260~1625nm ripples
It is long), the utility model optical fiber is non-single-mode fiber under straight wave guide state, is carried out in sufficiently small bending radius by by optical fiber
Bending, makes its fibre core high-order mode that close coupling occur with the pattern of high index of refraction filter mold layer, it is possible to achieve high-order mode to be filtered, so that real
The purpose of existing equivalent single mode transport.Allow that there is refringence high between fibre core and covering, it is ensured that optical fiber basic mode it is super
Low bend loss is transmitted, it is possible to achieve multiple winding of the optical fiber under small-bend radius still has low bending loss, while again
Can realize that single mode transport works as single-mode fiber, both can be by way of welding, also can be by the side of flexible connection
Formula is connected with single-mode fiber.The utility model optical fiber only needs that optical fiber is capable of achieving the mesh of single mode transport by appropriate bending
, it is adaptable to the occasion of compact optical fiber device and optical fiber component is needed in various short range communication systems.It is of the present utility model
Optical fiber structure has circular symmetry, can be realized using existing ripe fiber making processes, it is only necessary to high to fibre core and two
Refractive index filter mold layer is doped, and the refractive index in other regions is identical with surrounding layer, simplifies the preparation technology of optical fiber, can
Effectively reduce the cost of manufacture of optical fiber.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described.
In a kind of radial refractive index distribution figure of optical fiber that Fig. 1 is provided for the embodiment of the present application, wherein 1- fibre cores, 2- first
Covering, the highs index of refraction of 3- first filter mold layer, the inner claddings of 4- second, the highs index of refraction of 5- second filter mold layer, 6- surrounding layers；
A kind of optical fiber that Fig. 2 (a) is provided for the embodiment of the present application when bending radius is 7.5mm, its LP01The mould field of mould point
Butut；
A kind of optical fiber that Fig. 2 (b) is provided for the embodiment of the present application when bending radius is 7.5mm, its LP11The mould field of mould point
Butut；
A kind of optical fiber that Fig. 2 (c) is provided for the embodiment of the present application when bending radius is 7.5mm, its another LP11The mould of mould
Field pattern；
Fig. 3 is the mode distributions figure of a covering Defect Modes of the embodiment of the present application；
Fig. 4 (a) is the utility model optical fiber, contrast optical fiber 1, the LP of contrast optical fiber 201The bending loss of mould is with operation wavelength
Variation relation curve map；
Fig. 4 (b) is the utility model optical fiber, contrast optical fiber 1, the LP of contrast optical fiber 211The bending loss of mould is with operation wavelength
Variation relation curve map.
Specific embodiment
Design of the present utility model is：On the basis of the few mould fibre core with ultralow bending loss, bending is designed
Defect Modes with leakage losses high under state, so that the high-order mode of optical fiber can either occur close coupling and let out with covering Defect Modes
Dew falls, and the low bend loss of optical fiber basic mode can be kept to transmit again.
From the flexure theory of optical fiber, when fibre-optical bending, its structure can still be equivalent to a straight wave guide, i.e., equivalent is straight
The index distribution of waveguide is represented by：Here n0(x, y) is optical fiber when not bending
Cross section index distribution, the index distribution of n (x, y) equivalent straight wave guide, χ is the elasto-optical coefficient of material, RbIt is optical fiber
Bending radius, it is assumed here that optical fiber bends along x-axis positive direction.From formula, after fibre-optical bending, further away from core centre, curved
Bilge radius are smaller, and its variations in refractive index is bigger.Mode of energy will in being generally focused on high-refractive-index regions, thus fibre core due to light
The side increased to refractive index is concentrated, i.e., its pattern effective refractive index generally increases with the increase of bending radius.Meanwhile,
The side of fiber core refractive index increase, the refractive index of surrounding layer also increases with bending, and ultimately resulting in covering Defect Modes cannot meet
Total internal reflection condition and reveal.
Here in the case where ensureing that fibre core is sufficiently large, there is big refraction between setting fibre core inner cladding adjacent thereto
Rate is poor, i.e., its normalized frequency is sufficiently large.Thereby guarantee that optical fiber basic mode has ultralow bending loss.Now, its high-order mode
Effective refractive index is also larger, requires that the effective refractive index of covering Defect Modes is also larger for this, so as to be conducive to both in bending
Coupling under state.Larger pattern effective refractive index also implies that the loss in the bent state of covering Defect Modes is relatively low, no
Lost beneficial to by high-order mode.Therefore, it is proposed that using double-deck high index of refraction filter mold layer, wherein near the high index of refraction of fibre core
The refractive index for filtering mold layer is larger, is conducive to its defect to look into the coupling with high-order mode, and filters mold layer away from the high index of refraction of fibre core
Refractive index is relatively low, is conducive to its Defect Modes to produce big loss in the bent state.Simultaneously as under case of bending, away from fibre
The region variations in refractive index of core is larger, thus under appropriate case of bending, the Defect Modes in two kinds of high index of refraction filter mold layer are still
There can be close effective refractive index, so as to ensure that it occurs strong coupling, high-order mode is filtered mould through two-layer high index of refraction
Revealed after layer.
Standard single-mode fiber is single mode transport in operating wave strong point, i.e., its cutoff wavelength is less than its operation wavelength.And this
The cutoff wavelength of utility model optical fiber is more than its operation wavelength.Thus, under straight optical fiber state, optical fiber can support that high-order mode is passed
It is defeated, and under fibre-optical bending state, its high-order mode can produce big bending loss to ultimately result in it and cannot form effectively transmission, from
And realize equivalent single mode transport.
The refractive index of fibre core must be sufficiently high, to realize the transmission of the ultralow bending loss of basic mode.Avoid the occurrence of simultaneously excessive
Pattern occur and influence fiber transmission performance.Require to meet between the fibre core and the first inner cladding for this：2.405<V<
4.4, here：V represents normalized frequency, λ0=1625nm.I.e. its fibre core in 1625nm wavelength and
The transmission of high-order mode can be supported in shorter wave-length coverage.
First high index of refraction filter mold layer should have enough Defect Modes, to ensure to produce efficient coupling with high-order mode, together
When, constraint light ability again can not be too strong, so that beneficial to the leakage of its energy in the bent state.First high index of refraction filters mould
The refractive index n of layer3With radial width a3Meet：1.7<F<3.3, and have V>F.Here：λ0=
1625nm。
The effective refractive index of covering Defect Modes should be less than high-order mode.Because after the fibre-optical bending, its Defect Modes has
Effect refractive index increases larger, both is easily reached the purpose of effective refractive index close (i.e. pattern match).And the opposing party
Face, exactly because the effective refractive index of covering Defect Modes is relatively low, so as to ensure that it under the straight optical fiber state and under case of bending,
Effective refractive index all differs larger with optical fiber basic mode, thus optical fiber basic mode loss influence it is smaller, it is ensured that optical fiber basic mode it is low curved
Song loss transmission.
Because in order to ensure that the low bend loss of fibre core basic mode is transmitted, fibre core is larger with the refringence of covering, i.e., it is high
The effective refractive index of rank mould is also than larger, so that the first high index of refraction filter mold layer and the second high index of refraction filter mold layer are also necessary
With refractive index higher realizing matching for its Defect Modes and fibre core high-order mode.And the first high index of refraction filter mold layer and second high
The refractive index of refractive index filter mold layer is bigger, and its bending loss is also just smaller.For the bending loss for making Defect Modes increases, require here
The refractive index of the first high index of refraction filter mold layer is higher than the refractive index of the second high index of refraction filter mold layer.On the one hand, the first high index of refraction
The effective refractive index for filtering the Defect Modes of mold layer is higher, it is easy to coupled with fibre core high-order mode；And on the other hand, the second refraction high
The refractive index of rate filter mold layer is relatively low, it is prone to reveal；Simultaneously as the second high index of refraction filters mold layer away from fibre core, its refraction
Rate can produce bigger change with the bending of optical fiber, thus, its in the bent state, with the first high index of refraction filter mold layer phase
Near refractive index, it is ensured that the close coupling between two patterns of filter mold layer.I.e. in the bent state, the first high index of refraction filter mold layer
Play a part of for fibre core high-order mode to be coupled to covering.And the second high index of refraction filter mold layer plays the bending loss of increase Defect Modes
Effect.In the bent state, direction is increased along refractive index, the first high index of refraction filter mold layer still should be greater than described second
High index of refraction filters the refractive index of mold layer, is required for this：The first high index of refraction filter mold layer filters mould with second high index of refraction
Meet between the refractive index of layer：n3-n5>(a5/2+a4+a3/2)/Rb, R hereb=7.5mm.
The utility model optical-fibre theory and feature are illustrated with reference to figure.
Optical fiber by fibre core (, the first inner cladding, the first high index of refraction filter mold layer, the second inner cladding, the second high index of refraction filter mould
Layer and surrounding layer composition.A kind of radial refractive index distribution figure of optical fiber that Fig. 1 is provided for the embodiment of the present application, wherein 1- fibre cores,
The inner claddings of 2- first, the highs index of refraction of 3- first filter mold layer, the inner claddings of 4- second, the highs index of refraction of 5- second filter mold layer, 6- surrounding layers；
It is a kind of optical fiber basic mode (i.e. LP of the utility model optical fiber when bending radius is 7.5mm with reference to Fig. 201Mould) and high-order mode
(LP11Mould) mode field area distribution, Fig. 2 (a) be a kind of optical fiber for providing of the embodiment of the present application when bending radius is for 7.5mm,
Its LP01The mode distributions figure of mould；A kind of optical fiber that Fig. 2 (b) is provided for the embodiment of the present application when bending radius is 7.5mm, its
LP11The mode distributions figure of mould；A kind of optical fiber that Fig. 2 (c) is provided for the embodiment of the present application is when bending radius is 7.5mm, and its is another
One LP11The mode distributions figure of mould；As seen from the figure, LP01Mould still concentrates on core centre region, and LP11Mould is substantially high with first to be rolled over
The Defect Modes penetrated in rate filter mold layer are coupled.Fig. 3 is the mode distributions figure of a covering Defect Modes of the embodiment of the present application, by
Figure is visible, and the main integrated distribution of covering Defect Modes filters mold layer, the second inner cladding, the second high index of refraction filter mould in the first high index of refraction
Layer.In order to reflect that high index of refraction filters the effect of mold layer, we compared for the utility model optical fiber, contrast optical fiber 1 (equivalent to this reality
A is taken with novel optical fiber5=0, i.e., filter mold layer in the absence of the second high index of refraction) and optical fiber 2 is contrasted (equivalent to the utility model
Optical fiber takes a3=0 and a5=0, as a kind of step optical fiber) in the case of three kinds and LP11The bending loss curve of mould.Can by Fig. 4
See, Fig. 4 (a) is the utility model optical fiber, contrast optical fiber 1, the LP of contrast optical fiber 201The bending loss of mould with operation wavelength change
Change graph of relation；Fig. 4 (b) is the utility model optical fiber, contrast optical fiber 1, the LP of contrast optical fiber 211The bending loss of mould is with work
Make the variation relation curve map of wavelength；The LP of the utility model optical fiber01The bending loss of mould is maximum, but in diagram wave-length coverage
Respectively less than 1 × 10-4DB/ circles, it is ensured that the low bend loss transmission of optical fiber basic mode.And when its wavelength reaches more than 1.3 μm, its
LP11The bending loss of mould is more than 2dB/ circles, it is ensured that filtered after being bent.Regardless of whether be to contrast optical fiber 1 or contrast optical fiber 2,
Its LP11The bending loss of mould is much lower, so as to be difficult to the purpose that broadband filters high-order mode.Therefore, using this practicality
New double filter mold layer structures, can effectively improve its LP11The bending loss of mould, it is equivalent so as to be realized in wave-length coverage wide
Single mode transport.Embodiment：
Optical fiber is by fibre core, the first inner cladding, the first high index of refraction filter mold layer, the second inner cladding, the second high index of refraction filter mould
Layer and surrounding layer composition.The radius a of fibre core1=5 μm, the refringence n of fibre core and the first inner cladding1-n2=0.01, first is high
The radial width of refractive index filter mold layer is 6 μm, its refringence n with surrounding layer3-n6=0.005, the second high index of refraction filter mould
The radial width of layer is 6 μm, its refringence n with surrounding layer5-n6=0.003.When the bending radius of optical fiber is 7.5mm,
In 1.26~1.625 μ m wavelength ranges, its LP01Mould bending loss is respectively less than 1 × 10-4DB/ circles；And work as optical wavelength in 1.3 μm of ripples
During the above long, its LP11Mould bending loss is all higher than 2dB/ circles, it is ensured that it can be effectively filtered out.In 1.31 mum wavelength, its
Mode field diameter is 8.8 μm.
Above optical fiber can be used and realized with general single mode fiber identical manufacture craft.
Above-mentioned accompanying drawing is only explanatory view, protection domain of the present utility model is not formed and is limited.It should be understood that this
A little embodiments the utility model solely for the purpose of illustration, rather than scope of the present utility model is limited by any way.
Claims (10)
1. a kind of new less fundamental mode optical fibre, it is characterised in that including：The covering of fibre core and the encirclement fibre core；
The covering includes：Surround the first inner cladding of fibre core；Surround the first high index of refraction filter mold layer of the first inner cladding；Surround
First high index of refraction filters the second inner cladding of mold layer；Surround the second high index of refraction filter mold layer of the second inner cladding；And surround the
Two highs index of refraction filter the surrounding layer of mold layer；
Wherein, fibre core, the first inner cladding, the first high index of refraction filter mold layer, the second inner cladding, the second high index of refraction filter mold layer and
The refractive index of the surrounding layer is respectively n1、n2、n3、n4、n5、n6, meet：n1＞ n3＞ n5>n6, and have n2=n4=n6；It is described
Meet between fibre core and the first inner cladding：2.405<V<4.4, whereinV represents normalized frequency, λ0
=1625nm, a1Represent the radius of the fibre core；First high index of refraction filters the refractive index n of mold layer3With radial width a3It is full
Foot：1.7<F<3.3, and have V>F, whereinFirst inner cladding, the first high index of refraction filter mold layer,
The radial width of the second inner cladding and the second high index of refraction filter mold layer is respectively a2, a3, a4, a5。
2. new less fundamental mode optical fibre according to claim 1, it is characterised in that in 1260~1625nm wave-length coverages, institute
State the LP of optical fiber11The effective refractive index of mould is all higher than the effective refractive index of the covering Defect Modes of the optical fiber.
3. new less fundamental mode optical fibre according to claim 1, it is characterised in that：First high index of refraction filters mold layer with the second folding high
Meet n between the refractive index for penetrating rate filter mold layer3-n5>(a5/2+a4+a3/2)/Rb, Rb=7.5mm.
4. new less fundamental mode optical fibre according to claim 1, it is characterised in that：First high index of refraction filters the radial width of mold layer
a3With the radial width a that the second high index of refraction filters mold layer5Meet a3≥a5。
5. new less fundamental mode optical fibre according to claim 1, it is characterised in that：The refractive index n of fibre core1With the refraction of surrounding layer
Rate n6Meet 0.015>n1-n6>0.007。
6. new less fundamental mode optical fibre according to claim 1, it is characterised in that：The radial width a of the first inner cladding2Meet 7.9
μm≥a2≥4.0μm。
7. new less fundamental mode optical fibre according to claim 1, it is characterised in that：First high index of refraction filters the radial width of mold layer
a3Meet 8.5 μm >=a3≥3.5μm。
8. new less fundamental mode optical fibre according to claim 1, it is characterised in that：The radial width a of the second inner cladding4Meet 4.6
μm≥a4≥2.4μm。
9. new less fundamental mode optical fibre according to claim 1, it is characterised in that：Second high index of refraction filters the radial width of mold layer
a5Meet 8.5 μm >=a5≥3.5μm。
10. new less fundamental mode optical fibre according to claim 1, it is characterised in that：In 1550nm wavelength, the optical fiber it is curved
Song loss meets：Radius of curvature RbDuring >=7.5mm, LP01Mould bending loss is less than 1 × 10-3DB/ circles；Radius of curvature Rb≤7.5mm
When, LP11The bending loss of mould is more than 5dB/ circles.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597603A (en) * | 2016-10-18 | 2017-04-26 | 国网江西省电力公司信息通信分公司 | Novel few-mode fiber |
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597603A (en) * | 2016-10-18 | 2017-04-26 | 国网江西省电力公司信息通信分公司 | Novel few-mode fiber |
| CN106597603B (en) * | 2016-10-18 | 2019-12-31 | 国网江西省电力公司信息通信分公司 | Novel few-mode optical fiber |
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