CN106997071A - A kind of flap optical fiber of large mode field single mode multilayer fibre core - Google Patents
A kind of flap optical fiber of large mode field single mode multilayer fibre core Download PDFInfo
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- CN106997071A CN106997071A CN201611189204.XA CN201611189204A CN106997071A CN 106997071 A CN106997071 A CN 106997071A CN 201611189204 A CN201611189204 A CN 201611189204A CN 106997071 A CN106997071 A CN 106997071A
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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
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
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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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02333—Core having higher refractive index than cladding, e.g. solid core, effective index guiding
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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
- G02B6/03688—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 5 or more layers
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Abstract
A kind of flap optical fiber of large mode field single mode multilayer fibre core, belongs to large-power optical fiber amplifier, laser and special optical fiber.Overcome the defects such as existing larger-mode-area single-mode fiber batch production yield rate is low and flap optical fiber mode field area is limited.The fiber optic hub is rare-earth ion-doped core area (1), the first silicon ring core (2 is distributed from inside to outside, 1), the first rare earth doped ion ring core (3,1) ... n-th layer silicon ring core (2, N), n-th layer rare earth doped ion ring core (3, N), the flap core (4,1) ... (4, M) of M same radius and radian is uniformly distributed around n-th layer ion ring core, inner cladding (5), surrounding layer (6).Ion core area, ion ring core, flap core refractive index it is equal, be n1；The refractive index of silicon ring core is equal, is n2；n2<n1.Flap fibre core is processed into the flap fibre core of M same radius and radian by a preform, is saved material, is easy to manufacture.Manufacture method of the present invention is simple and effective, it is adaptable to mass produce.
Description
Technical field
The present invention relates to a kind of flap optical fiber of large mode field single mode multilayer fibre core, belong to large-power optical fiber amplifier, laser
Device, special optical fiber field.
Background technology
Rare-earth Doped OFAs or laser use doped rare earth element (Nd, Sm, Ho, Er, Pr, Tm, Yb etc.) ionic light
Fibre, directly amplifying for light is realized using stimulated radiation mechanism.
Optical fiber laser is with its remarkable performance and cheap price, in fiber optic communication, industrial processes, medical treatment, military affairs etc.
Field achieves increasingly extensive application, 2010 it has been reported that the continuous wave laser of 10kW power.As laser technology should
Development, the development of material processing, space communication, laser radar, photoelectronic warfare, laser weapon etc. are, it is necessary to high power, high-quality
The laser of amount, it is desirable to which single-mode output power reaches MW even GW magnitudes.However, nonlinear effect limits the increase of power.Increase
Plus mode field area is an effective ways for suppressing nonlinear effect.2011, Tino Eidam et al. discovery modes shakiness was existing
As if the principal element of infringement high power light beam quality.The unstable factor of pattern is caused to include horizontal hole burning, the caused light of heating
Fine variations in refractive index etc., these cause higher order mode to obtain higher gain.Therefore, suppress higher order mode, keep single mode operation,
It is to improve one of important way of high-capacity optical fiber laser and amplifier performance.
In these years, many new strong laser fibers have been designed and manufactured.But most strong laser fiber
There is certain defect, such as complicated, manufacture difficulty is big, flexural property is poor etc..
Due to the limitation of existing manufacturing technology, it is difficult to realize numerical aperture using traditional fiber manufacture method and is less than 0.05
Step index fiber.
And only with the double clad rare earth doped fiber laser of single mode active fiber core, because single mode active fiber core core diameter is small
In equal to 10 microns, limited by non-linear, structural element and diffraction limit, the luminous power born is limited, single mode active light
Long and slender core continuous wave damaging thresholding about 1W/m2, its optical damage danger is big as realize high-power single mode fiber laser one
Is challenged in addition to optical damage, because the heat that high-power light is produced can also damage optical fiber, or even can finally melt fibre core.There is text
Report is offered, every meter of erbium-ytterbium co-doped fiber laser can produce 100W heat.
Photonic crystal fiber can realize super large mode field area, but it is perplexed by bending loss, manufacture difficulty is big,
Cost is high.
Multicore optical fiber laser realizes single-mode output, and effective core area can reach 465 μm 2.But this single-mode laser
The multi-core fiber that device is used, the distance between core diameter and adjacent fibre core to fiber core need accurate design, to optical fiber
The admissible error of the distance between fibre core is small, and batch production yield rate is low.
Flap optical fiber can realize single mode operation by choosing specific optical fiber parameter.This optical fiber, its specific structure
It is to increase the loss beyond basic mode, realizes and single mode operation is realized in optical fiber of the sandwich layer diameter at 50 microns, but its power
Raising be limited to core radius.
Many groove optical fiber are a kind of novel optical fibers, are surround by multilayer shape core, realize single mode operation.This optical fiber, technique
It is required that high, big with ordinary optic fibre junction loss, birefringence caused by bending is unconquerable problem.
The content of the invention
To overcome existing traditional fiber limited numerical aperture, single-core multiple rare-earth-doped ion region double-clad optical fiber to bear luminous power
Limited, photonic crystal fiber airport manufacture difficulty is big, large mode field single mode multi-core fiber batch production yield rate is low, flap optical fiber
A kind of defect such as sandwich layer limited diameter and many groove fibre-optical bending sensitivities, it is proposed that flap of large mode field single mode multilayer fibre core
Optical fiber.
1. the flap optical fiber of large mode field single mode multilayer fibre core, the fiber optic hub is rare-earth ion-doped core area, divide from inside to outside
Cloth first layer silicon ring core, first layer rare earth doped ion ring core ... n-th layer silicon ring core, n-th layer rare earth doped ion ring core, the optical fiber
Inner cladding is uniformly distributed the flap fibre core of M same radius and radian, inner cladding, outsourcing around n-th layer rare earth doped ion ring core
Layer, the integer of 1≤N≤5, the integer of 3≤M≤32；Rare-earth ion-doped core area, first layer rare earth doped ion ring core ... n-th layer mix dilute
Native ion ring core, flap fibre core refractive index it is equal；The refractive index of first layer silicon ring core ... n-th layer silicon ring core is equal；
The refractive index of first layer silicon ring core ... n-th layer silicon ring core be less than rare-earth ion-doped core area, rare earth doped ion ring core,
The refractive index of flap fibre core；The refractive index of inner cladding is less than the refractive index of first layer silicon ring core ... n-th layer silicon ring core, surrounding layer
Refractive index be less than inner cladding refractive index.
2. rare-earth ion-doped core area, first layer rare earth doped ion ring core ... n-th layer rare earth doped ion ring core, flap fibre core
Rare-earth ion-doped type include neodymium ion, erbium ion, ytterbium ion, thorium ion, praseodymium ion, holmium ion, samarium ion, neodymium ytterbium and be co-doped with
Ion or erbium and ytterbium codoping ion；Rare-earth ion-doped core area, the rare-earth ion-doped ring of first layer rare earth doped ion ring core ... n-th layer
Core, flap fibre core rare-earth ion-doped type it is identical.
3. the core diameter in rare-earth ion-doped core area is less than or equal to 50 μm；First layer rare earth doped ion ring core ... n-th layer
Each ring core thickness of rare earth doped ion ring core is less than or equal to 5 μm, and the radius of flap fibre core is less than or equal to 25 μm.
4. rare-earth ion-doped core area and the minimum range of first layer rare earth doped ion ring core are less than or equal to 5 μm, each layer mixes dilute
Minimum range between native ion ring core is less than or equal to 5 μm, and flap fibre core (4,1), (4,2) ... (4, M) are uniformly distributed, flap
Fibre core is processed into by a preform, and each piece of flap fibre core radian is equal to 360 ° divided by M.
Beneficial effects of the present invention are specific as follows：A kind of flap optical fiber of large mode field single mode multilayer fibre core, can realize big work(
The laser output of rate, by adjusting the thickness of the area in the rare-earth ion-doped core area of fiber optic hub, rare earth doped ion ring core, and mixes
The radius and angle of rare earth flap fibre core, adjust the number of plies and thickness of silicon ring core, realize the big effective core area of optical fiber, can be real
Existing high-power single-mode laser output.Presence and the angle adjustable of flap optical fiber due to silicon ring, so as to be advantageously implemented fibre core
Thermal diffusion, is effectively improved the heat resistance and unimodular property of optical fiber.Flap fibre core can be made up of a preform, section
About manufacturing cost.
Brief description of the drawings
Fig. 1 is the fiber cross-sections figure of 1 layer of 3 valve optical fiber of big mode field area single mode.
Fig. 2 is the fiber cross-sections figure of 1 layer of 4 valve optical fiber of big mode field area single mode.
Fig. 3 is the fiber cross-sections figure of 1 layer of 6 valve optical fiber of big mode field area single mode.
Fig. 4 is the fiber cross-sections figure of 1 layer of 16 valve optical fiber of big mode field area single mode.
Fig. 5 is the fiber cross-sections figure of 3 layer of 3 valve optical fiber of big mode field area single mode.
Fig. 6 is the fiber cross-sections figure of 3 layer of 4 valve optical fiber of big mode field area single mode.
Fig. 7 is the fiber cross-sections figure of 3 layer of 6 valve optical fiber of big mode field area single mode.
Fig. 8 is the fiber cross-sections figure of 3 layer of 16 valve optical fiber of big mode field area single mode.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Embodiment one
1 layer of 3 valve optical fiber of big mode field area single mode, referring to Fig. 1.The fiber optic hub be rare-earth ion-doped core area (1), by it is interior to
It is outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), around first layer rare earth doped ion ring core (3,
1) flap fibre core (4,1), (4,2), (4,3) of 3 same radius, radian and thickness, inner cladding (5), surrounding layer are uniformly distributed
(6), N=1 in this example, M=3；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3) mix dilute
Native ionic type is erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), the refraction of (4,3)
Rate is equal；
The refractive index of first layer silicon ring core (2,1) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), valve
Shape fibre core (4,1), (4,2), the refractive index of (4,3)；The refractive index of inner cladding (5) is less than the refraction of first layer silicon ring core (2,1)
Rate, the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 50 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 120 °
The thickness of silicon ring core is 3 μm.
Embodiment two
1 layer of 4 valve optical fiber of big mode field area single mode, referring to Fig. 2.The fiber optic hub be rare-earth ion-doped core area (1), by it is interior to
It is outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), around first layer rare earth doped ion ring core (3,
1) it is uniformly distributed flap fibre core (4,1), (4,2), (4,3), (4,4) of 4 same radius, radian and thickness, inner cladding (5),
N=1, M=4 in surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3), (4,4)
Rare-earth ion-doped type be erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3), (4,4)
Refractive index it is equal；
The refractive index of first layer silicon ring core (2,1) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), valve
Shape fibre core (4,1), (4,2), (4,3), the refractive index of (4,4)；The refractive index of inner cladding (5) is less than first layer silicon ring core (2,1)
Refractive index, the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 50 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 90 °
The thickness of silicon ring core is 3 μm.
Embodiment three
1 layer of 6 valve optical fiber of big mode field area single mode, referring to Fig. 3.The fiber optic hub be rare-earth ion-doped core area (1), by it is interior to
Outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), the optical fiber inner cladding mix dilute around first layer
Native ion ring core (3,1) be uniformly distributed the flap fibre core (4,1) of 6 same radius and radian, (4,2), (4,3), (4,4), (4,
5) N=1, M=6 in, (4,6), inner cladding (5), surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3), (4,
4), (4,5), the rare-earth ion-doped type of (4,6) are erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3), (4,
4), (4,5), (4,6) refractive index it is equal；
The refractive index of first layer silicon ring core (2,1) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), valve
Shape fibre core (4,1) ... the refractive index of (4,6)；The refractive index of inner cladding (5) is less than the refractive index of first layer silicon ring core (2,1),
The refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 20 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 60 °
The thickness of silicon ring core is 3 μm.
Example IV
1 layer of 16 valve optical fiber of big mode field area single mode, referring to Fig. 4.The fiber optic hub is rare-earth ion-doped core area (1), by interior
To outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), the optical fiber inner cladding is mixed around first layer
Rare earth ion ring core (3,1) be uniformly distributed the flap fibre core (4,1) of 16 same radius and radian, (4,2), (4,3), (4,4),
(4,5)、(4,6)、(4,7)、(4,8)、(4,9)、(4,10)、(4,11)、(4,12)、(4,13)、(4,14)、(4,15)、(4,
16) N=1, M=16 in, inner cladding (5), surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3), (4,
4)、(4,5)、(4,6)、(4,7)、(4,8)、(4,9)、(4,10)、(4,11)、(4,12)、(4,13)、(4,14)、(4,15)、
(4,16) rare-earth ion-doped type is erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), flap fibre core (4,1), (4,2), (4,3), (4,
4)、(4,5)、(4,6)、(4,7)、(4,8)、(4,9)、(4,10)、(4,11)、(4,12)、(4,13)、(4,14)、(4,15)、
(4,16) refractive index is equal；
The refractive index of first layer silicon ring core (2,1) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), valve
Shape fibre core (4,1) ... the refractive index of (4,16)；The refractive index of inner cladding (5) is less than first layer silicon ring core (2,1) ... the 3rd
The refractive index of layer silicon ring core (2,3), the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 20 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 22.5 °
The thickness of silicon ring core is 3 μm.
Embodiment five
3 layer of 3 valve optical fiber of big mode field area single mode, referring to Fig. 5.The fiber optic hub be rare-earth ion-doped core area (1), by it is interior to
Outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), second layer silicon ring core (2,2), the second layer are mixed
Rare earth ion ring core (3,2), third layer silicon ring core (2,3), third layer rare earth doped ion ring core (3,3), the optical fiber inner cladding enclose
Around third layer rare earth doped ion ring core (3,3) be uniformly distributed the flap fibre core (4,1) of 3 same radius and radian, (4,2), (4,
3) N=3, M=3 in, inner cladding (5), surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2), the rare-earth ion-doped type of (4,3) is erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2), the refractive index of (4,3) is equal；
The refractive index of first layer silicon ring core (2,1) ... third layer silicon ring core (2,3) is equal；First layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1) ...
(3,3), the refractive index of flap fibre core (4,1) ... (4,3)；The refractive index of inner cladding (5) be less than first layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3), the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 20 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 120 °
The thickness of silicon ring core is 3 μm.
Embodiment six
3 layer of 4 valve optical fiber of big mode field area single mode, referring to Fig. 6.The fiber optic hub be rare-earth ion-doped core area (1), by it is interior to
Outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), second layer silicon ring core (2,2), the second layer are mixed
Rare earth ion ring core (3,2), third layer silicon ring core (2,3), third layer rare earth doped ion ring core (3,3), the optical fiber inner cladding enclose
Around third layer rare earth doped ion ring core (3,3) be uniformly distributed the flap fibre core (4,1) of 4 same radius and radian, (4,2), (4,
3) N=3, M=4 in, (4,4), inner cladding (5), surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2), (4,3), the rare-earth ion-doped type of (4,4) are erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2), (4,3), (4,4) refractive index it is equal；
The refractive index of first layer silicon ring core (2,1) ... third layer silicon ring core (2,3) is equal；First layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1) ...
(3,3), the refractive index of flap fibre core (4,1) ... (4,4)；The refractive index of inner cladding (5) be less than first layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3), the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 20 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 90 °
The thickness of silicon ring core is 3 μm.
Embodiment seven
3 layer of 6 valve optical fiber of big mode field area single mode, referring to Fig. 7.The fiber optic hub be rare-earth ion-doped core area (1), by it is interior to
Outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), second layer silicon ring core (2,2), the second layer are mixed
Rare earth ion ring core (3,2), third layer silicon ring core (2,3), third layer rare earth doped ion ring core (3,3), the optical fiber inner cladding enclose
Around third layer rare earth doped ion ring core (3,3) be uniformly distributed the flap fibre core (4,1) of 6 same radius and radian, (4,2), (4,
3) N=3, M=6 in, (4,4), (4,5), (4,6), inner cladding (5), surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2), (4,3), the rare-earth ion-doped type of (4,4) are erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2), (4,3), (4,4) refractive index it is equal；
The refractive index of first layer silicon ring core (2,1) ... third layer silicon ring core (2,3) is equal；First layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1) ...
(3,3), the refractive index of flap fibre core (4,1) ... (4,6)；The refractive index of inner cladding (5) be less than first layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3), the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 20 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 60 °
The thickness of silicon ring core is 3 μm.
Embodiment eight
3 layer of 16 valve optical fiber of big mode field area single mode, referring to Fig. 8.The fiber optic hub is rare-earth ion-doped core area (1), by interior
To outer distribution first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1), second layer silicon ring core (2,2), the second layer
Rare earth doped ion ring core (3,2), third layer silicon ring core (2,3), third layer rare earth doped ion ring core (3,3), the optical fiber inner cladding
Around third layer rare earth doped ion ring core (3,3) be uniformly distributed the flap fibre core (4,1) of 16 same radius and radian, (4,2),
(4,3)、(4,4)、(4,5)、(4,6)、(4,7)、(4,8)、(4,9)、(4,10)、(4,11)、(4,12)、(4,13)、(4,14)、
N=3, M=16 in (4,15), (4,16), inner cladding (5), surrounding layer (6), this example；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2)、(4,3)、(4,4)、(4,5)、(4,6)、(4,7)、(4,8)、(4,9)、(4,10)、(4,11)、(4,12)、(4,13)、(4,
14), (4,15), the rare-earth ion-doped type of (4,16) are erbium ion.
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1), (3,2), (3,3), flap fibre core (4,1), (4,
2)、(4,3)、(4,4)、(4,5)、(4,6)、(4,7)、(4,8)、(4,9)、(4,10)、(4,11)、(4,12)、(4,13)、(4,
14), (4,15), (4,16) refractive index it is equal；
The refractive index of first layer silicon ring core (2,1) ... third layer silicon ring core (2,3) is equal；First layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1) ...
(3,3), the refractive index of flap fibre core (4,1) ... (4,16)；The refractive index of inner cladding (5) be less than first layer silicon ring core (2,
1) ... the refractive index of third layer silicon ring core (2,3), the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5)
A diameter of 20 μm of rare-earth ion-doped core area (1), the thickness of rare earth doped ion ring core is 3 μm, the half of flap fibre core
Footpath is 25 μm, and angle is 22.5 °
The thickness of silicon ring core is 3 μm.
Claims (4)
1. the flap optical fiber of large mode field single mode multilayer fibre core, it is characterized in that：The fiber optic hub is rare-earth ion-doped core area (1), by
It is interior to be distributed first layer silicon ring core (2,1), first layer rare earth doped ion ring core (3,1) ... n-th layer silicon ring core (2, N), N to outer
Layer rare earth doped ion ring core (3, N), it is individual identical that the optical fiber inner cladding is uniformly distributed M around n-th layer rare earth doped ion ring core (3, N)
The flap fibre core (4,1) ... (4, M) of radius and radian, inner cladding (5), surrounding layer (6), the integer of 1≤N≤5,3≤M≤32 are whole
Number；
Rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1) ... (3, N), flap fibre core (4,1) ... the folding of (4, M)
Penetrate rate equal；The refractive index of first layer silicon ring core (2,1) ... n-th layer silicon ring core (2, N) is equal；First layer silicon ring core (2,
1) ... the refractive index of n-th layer silicon ring core (2, N) is less than rare-earth ion-doped core area (1), rare earth doped ion ring core (3,1) ...
(3, N), flap fibre core (4,1) ... the refractive index of (4, M)；The refractive index of inner cladding (5) be less than first layer silicon ring core (2,
1) ... the refractive index of N silicon ring core (2, N), the refractive index of surrounding layer (6) is less than the refractive index of inner cladding (5).
2. the flap optical fiber of large mode field single mode multilayer fibre core according to claim 1, it is characterized in that：Rare-earth ion-doped core area
(1), rare earth doped ion ring core (3,1) ... (3, N), the rare-earth ion-doped type of flap fibre core (4,1) ... (4, M) include neodymium
Ion, erbium ion, ytterbium ion, thorium ion, praseodymium ion, holmium ion, samarium ion, neodymium ytterbium are co-doped with ion or erbium and ytterbium codoping ion；Mix
Rare earth ion core area (1), rare earth doped ion ring core (3,1) ... (3, N), flap fibre core (4,1) ... (4, M) mix rare earth from
Subtype is identical.
3. the flap optical fiber of large mode field single mode multilayer fibre core according to claim 1, it is characterized in that：Rare-earth ion-doped core area
(1) core diameter is less than or equal to 50 μm；Each ring core thickness of rare earth doped ion ring core (3,1) ... (3, N) is less than or equal to 5 μ
M, flap fibre core (4,1) ... the radius of (4, M) is less than or equal to 25 μm.
4. the flap optical fiber of large mode field single mode multilayer fibre core according to claim 1, it is characterized in that：Rare-earth ion-doped core area
(1) it is less than or equal to 5 μm with the minimum range of first layer rare earth doped ion ring core (3,1), each layer rare earth doped ion ring core (3,
1) ... the minimum range between (3, N) is less than or equal to 5 μm, and flap fibre core (4,1), (4,2) ... (4, M) are uniformly distributed, valve
Shape fibre core is processed into by a preform, and each piece of flap fibre core radian is equal to 360 ° divided by M.
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