CN107505673A - A kind of large mode field multilayer flap optical fiber - Google Patents
A kind of large mode field multilayer flap optical fiber Download PDFInfo
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- CN107505673A CN107505673A CN201710850908.5A CN201710850908A CN107505673A CN 107505673 A CN107505673 A CN 107505673A CN 201710850908 A CN201710850908 A CN 201710850908A CN 107505673 A CN107505673 A CN 107505673A
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- refraction
- high index
- optical fiber
- index
- core
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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
- G02B6/02004—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
-
- 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
A kind of multilayer flap optical fiber with big mode field area, belongs to large-power optical fiber amplifier, laser, special optical fiber field.The optical fiber introduces low-refraction and suppresses passage, high index of refraction ring is divided into multilayer flap core, can control the modal loss of optical fiber, improves the single mode transport characteristic of optical fiber on the basis of conventional multilayer groove optical fiber.The fiber optic hub is high index of refraction fibre core (1), the interior low-refraction groove of inner cladding (2) and high index of refraction ring are arranged in order from inside to outside, and the number of plies of high index of refraction ring is N (1≤N≤6), suppress channel segmentation into N × M flap core (1≤M≤4) by M, (11 are followed successively by from inside to outside, 21,31,41) ... (16,26,36,46), outermost is surrounding layer (3).The present invention can utilize the method for MCVD method combination filling glass rods to be made, the suppression passage on preform high index of refraction ring, can be realized by the method for filling glass rod.
Description
Technical field
The present invention relates to a kind of multilayer flap optical fiber with big mode field area, belong to large-power optical fiber amplifier, laser
Device, special optical fiber field.
Background technology
With laser technology extensively should in material processing, space communication, laser radar, photoelectronic warfare, laser weapon etc.
With in order to obtain high-power, high quality laser, it is desirable to which single-mode output power reaches MW even GW magnitudes.So as to conversion
The optical fiber laser for the advantages that efficiency high, laser threshold are low, good beam quality is more paid attention to.1988, Snitzer et al.
[Snitzer, E., et al.Double clad, offset core Nd fiber since proposition doubly clad optical fiber
Laser.Optical Fiber Sensors 1988.], quick hair is obtained based on this cladding pumped laser and amplifier
Exhibition.In recent years, with the raising of semiconductor pump laser power and the improvement of pump mode, the output of simple optical fiber laser
Power can reach a kilowatt magnitude.But because single mode active fiber core core diameter only has several microns, by non-linear, structural element, diffraction
Limitation in terms of the physical mechanisms such as the limit, optical damage and fire damage, higher optical power density can not be born.Big mode field area
Optical fiber can be very good to suppress the effects such as non-linear and optical damage.Therefore solves the non-linear effect that launched power lifting faces
Answer and a kind of most directly effective approach for the restricted problems such as optical fiber damages is exactly large mode field optical fiber.2010 it has been reported that
Continuous wave laser [Richardson D.J., the et al.High power fiber lasers of 10kW power:current
status and future perspectives[J].J Opt Soc Am B,2010,27(11):B63-B92.]。2011
Year, Tino Eidam et al. discovery mode shakiness phenomenons are to damage principal element [the Eidam T., et of high power light beam quality
al.Experimental observations of the threshold-like onset of mode
instabilities in high power fiber amplifiers[J].Opt Express,2011,19(14):
13218-24.].The unstable factor of pattern is caused to include optical fibre refractivity change etc. caused by horizontal hole burning, heating, these cause
Higher order mode obtains higher gain.Therefore, suppress higher order mode, keep single mode operation, be to improve high power fiber laser
One of with the important way of amplifier performance.
In these years, many new strong laser fibers have been designed and manufactured.But most strong laser fiber
Have the defects of certain, for example, it is complicated, manufacture difficulty is big, flexural property is poor etc..Because existing manufacturing technology limits, profit
Step index fiber [Li M.-J., Chen X., Liu of the numerical aperture less than 0.05 are difficult to realize with traditional fiber manufacture method
A.,et al.Limit of Effective Area for Single-Mode Operation in Step-Index
Large Mode Area Laser Fibers[J].J Lightwave Technol,2009,27(15):3010-6.].And only
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 micro- less than or equal to 10
Rice, is limited, the luminous power born is limited, and single mode Active Optical Fiber fibre core is continuous by non-linear, structural element and diffraction limit
Ripple damaging thresholding about 1W/m2[J.Nilsson, J.K.Sahu, Y.Jeong, W.A.Clarkson, R.Selvas,
A.B.Grudinin, and S.U.Alam, " High Power Fiber Lasers：New Developments ",
Proceedings of SPIEVol.4974,50-59 (2003)], dangerous turn into of its optical damage realizes high-power single-mode fiber
A major challenge of laser because heat can also damage optical fiber caused by high-power light, or even can finally melt in addition to optical damage
Chemical fibre core.There is document report, every meter of erbium-ytterbium co-doped fiber laser can produce 100W heat [J.Nilsson, et al. " High-
power and tunable operation of erbium-ytterbium co-doped cladding-pumped
Fiber laser ", IEEE J.Quantum Electron.39,987-994 (2003)].Photonic crystal fiber can be realized super
Big mode field area [Michaille, L.；Bennett, C.R.；Taylor, D.M.；Shepherd, T.J.
" MulticorePhotonic Crystal Fiber Lasers for High Power/Energy Applications ",
IEEE Journalof Selected Topics in Quantum Electronics, 15 (2), 328-336 (2009)], no
Cross it by bending loss to be perplexed, manufacture difficulty is big, cost is high.Multicore optical fiber laser realizes single-mode output, effective mould field
Area can reach 465 μm2[Vogel, Moritz M, Abdou-Ahmed, Marwan, Voss, Andreas, Graf, Thomas,
" Very-large-mode-area, single-mode multicore fiber ", Opt.Lett.34 (18), 2876-2878
(2009)].But the multi-core fiber that this single-mode laser uses, between the core diameter and adjacent fibre core to fiber core away from
From accurate design is needed, small to the admissible error of the distance between fiber core, batch production yield rate is low.Flap optical fiber leads to
Cross and choose specific optical fiber parameter, can realize single mode operation [A.Yeung, K.S.Chiang, V.Rastogi, P.L.Chu,
And G.D.Peng, " Experimental demonstration of single-mode operation of large-
Core segmented cladding fiber, " in Optical Fiber Communication Conference,
Technical Digest (CD) (Optical Society of America, 2004), paper ThI4.].This optical fiber,
Its specific structure is to increase the loss beyond basic mode, realizes and realizes single mode work in optical fiber of the sandwich layer diameter at 50 microns
Make, but the raising of its power is limited to core radius.More groove optical fiber are a kind of novel optical fibers, are surround by multilayer fibre core,
Realize single mode operation [Jain D., Baskiotis C., Sahu J.K.Mode area scaling with multi-
trench rod-type fibers[J].Opt Express,2013,21(2):1448-55.]。
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
The defects of sandwich layer limited diameter, and the single mode transport characteristic of more groove optical fiber is improved, the present invention, which proposes one kind, has big mould
The multilayer flap optical fiber of scene product, can suppress optical fiber attenuation, reduce the loss of optical fiber, and the single mode transport for effectively improving optical fiber is special
Property.
According to one example embodiment, there is the multilayer flap optical fiber of big mode field area, center reflects to be high
Rate fibre core, inner cladding is followed successively by low-refraction groove from inside to outside and high index of refraction ring is alternately surround, and high index of refraction circular layer number is
N, each floor height refractive index ring by M suppress channel segmentation into N × M flap core, outermost layer be surrounding layer.The present invention can profit
It is made with the method for traditional MCVD methods and filling glass rod.
Beneficial effects of the present invention are specific as follows：A kind of multilayer flap optical fiber with big mode field area, can realize big work(
The laser output of rate, suppresses passage by increasing, can reduce fibre loss, effectively improve the single mode transport characteristic of optical fiber, energy
Realize high-power single-mode laser output.
Brief description of the drawings
Referring now to appended figure, what these were not necessarily drawn to scale, and wherein：
Fig. 1 is 1 sectional view for suppressing 1 layer of flap optical fiber of passage.
Fig. 2 is 4 sectional views for suppressing 1 layer of flap optical fiber of passage.
Fig. 3 is 4 sectional views for suppressing 3 layers of flap optical fiber of passage.
Fig. 4 is 1 sectional view for suppressing 6 layers of flap optical fiber of passage.
Fig. 5 is 2 sectional views for suppressing 6 layers of flap optical fiber of passage.
Fig. 6 is 3 sectional views for suppressing 6 layers of flap optical fiber of passage.
Fig. 7 is 4 sectional views for suppressing 6 layers of flap optical fiber of passage.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Embodiment one
Big mode field area 1 suppresses 1 layer of flap optical fiber of passage, referring to Fig. 1.The fiber optic hub is high index of refraction fibre core (1), to
Outer be inner cladding (2), and inner cladding (2) is interior to include first layer high index of refraction valve (11), and outermost is surrounding layer (3), M in this example
=1, N=1.
The refractive index of high index of refraction valve (11) is equal to the refractive index in high index of refraction core area (1)；The folding in high index of refraction core area (1)
The refractive index that rate is more than inner cladding (2) is penetrated, more than the refractive index of surrounding layer (3).
A diameter of 20 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, high index of refraction valve to fibre
The distance of core is 10 microns, and the width for suppressing passage is 6 microns.
Embodiment two
Big mode field area 4 suppresses 1 layer of flap optical fiber of passage, referring to Fig. 2.The fiber optic hub is high index of refraction core area (1), to
Outer is inner cladding (2), and first layer high index of refraction valve (11,21,31,41) is included in inner cladding (2), and outermost is surrounding layer (3),
M=4 in this example, N=1.
The refractive index of high index of refraction valve (11,21,31,41) is equal to the refractive index in high index of refraction core area (1), more than inner cladding
(2) refractive index, more than the refractive index of surrounding layer (3).
A diameter of 20 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, high index of refraction valve to fibre
The distance of core is 10 microns, and the width for suppressing passage is 6 microns.
Embodiment three
Big mode field area 4 suppresses 3 layers of flap optical fiber of passage, referring to Fig. 3.The fiber optic hub is high index of refraction core area (1), to
Outer is inner cladding (2), and first layer high index of refraction valve (11,21,31,41), second layer high index of refraction valve are included in inner cladding (2)
(12,22,32,42), third layer high index of refraction valve (13,23,33,43), outermost are surrounding layer (3), M=4, N in this example
=3.
High index of refraction valve (11,21,31,41), (12,22,32,42), the refractive index of (13,23,33,43) are equal to high reflect
The refractive index in Shuai Xin areas (1), more than the refractive index of inner cladding (2), more than the refractive index of surrounding layer (3).
A diameter of 30 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, the high refraction of adjacent two layers
The distance of rate valve is 10 microns, and the distance of first layer high index of refraction valve to fibre core is 10 microns, and the width for suppressing passage is micro- for 6
Rice.
Example IV
Big mode field area 1 suppresses 6 layers of flap optical fiber of passage, referring to Fig. 4.The fiber optic hub is high index of refraction core area (1), to
Outer is inner cladding (2), and first layer high index of refraction valve (11), second layer high index of refraction valve (12), third layer are included in inner cladding (2)
High index of refraction valve (13), the 4th floor height refractive index valve (14), layer 5 high index of refraction valve (15), layer 6 high index of refraction valve
(16), outermost is surrounding layer (3), M=1, N=6 in this example.
The refractive index of high index of refraction valve (11,12,13,14,15,16) is equal to the refractive index in high index of refraction core area (1), is more than
The refractive index of inner cladding (2), more than the refractive index of surrounding layer (3).
A diameter of 30 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, the high refraction of adjacent two layers
The distance of rate valve is 2 microns, and the distance of first layer high index of refraction valve to fibre core is 2 microns, and the width for suppressing passage is 6 microns.
Embodiment five
Big mode field area 2 suppresses 6 layers of flap optical fiber of passage, referring to Fig. 5.The fiber optic hub is high index of refraction core area (1), to
Outer be inner cladding (2), and inner cladding (2) is interior to include first layer high index of refraction valve (11,21), second layer high index of refraction valve (12,22),
Third layer high index of refraction valve (13,23), the 4th floor height refractive index valve (14,24), layer 5 high index of refraction valve (15,25), the 6th
Floor height refractive index valve (16,26), outermost are surrounding layer (3), M=2, N=6 in this example.
High index of refraction valve (11,21), (12,22), (13,23), (14,24), (15,25), the refractive index of (16,26) are equal to
The refractive index in high index of refraction core area (1), more than the refractive index of inner cladding (2), more than the refractive index of surrounding layer (3).
A diameter of 30 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, the high refraction of adjacent two layers
The distance of rate valve is 2 microns, and the distance of first layer high index of refraction valve to fibre core is 2 microns, and the width for suppressing passage is 6 microns.
Embodiment six
Big mode field area 3 suppresses 6 layers of flap optical fiber of passage, referring to Fig. 6.The fiber optic hub is high index of refraction core area (1), to
Outer be inner cladding (2), and inner cladding (2) is interior to include first layer high index of refraction valve (11,21,31), second layer high index of refraction valve (12,
22nd, 32), third layer high index of refraction valve (13,23,33), the 4th floor height refractive index valve (14,24,34), layer 5 high index of refraction valve
(15,25,35), layer 6 high index of refraction valve (16,26,36), outermost are surrounding layer (3), M=3, N=6 in this example.
High index of refraction valve (11,21,31), (12,22,32), (13,23,33), (14,24,34), (15,25,35), (16,
26th, refractive index 36) is equal to the refractive index in high index of refraction core area (1), more than the refractive index of inner cladding (2), more than surrounding layer (3)
Refractive index.
A diameter of 30 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, the high refraction of adjacent two layers
The distance of rate valve is 2 microns, and the distance of first layer high index of refraction valve to fibre core is 2 microns, and the width for suppressing passage is 6 microns.
Embodiment seven
Big mode field area 4 suppresses 6 layers of flap optical fiber of passage, referring to Fig. 7.The fiber optic hub is high index of refraction core area (1), to
Outer is inner cladding (2), and first layer high index of refraction valve (11,21,31,41), second layer high index of refraction valve are included in inner cladding (2)
(12,22,32,42), third layer high index of refraction valve (13,23,33,43), the 4th floor height refractive index valve (14,24,34,44), the
Five floor height refractive index valves (15,25,35,45), layer 6 high index of refraction valve (16,26,36,46), outermost are surrounding layer (3),
M=4 in this example, N=6.
High index of refraction valve (11,21,31,41), (12,22,32,42), (13,23,33,43), (14,24,34,44),
The refractive index of (15,25,35,45), (16,26,36,46) is equal to the refractive index in high index of refraction core area (1), more than inner cladding (2)
Refractive index, more than the refractive index of surrounding layer (3).
A diameter of 30 microns of high index of refraction core area (1), the thickness of high index of refraction valve is 8 microns, the high refraction of adjacent two layers
The distance of rate valve is 2 microns, and the distance of first layer high index of refraction valve to fibre core is 2 microns, and the width for suppressing passage is 6 microns.
Claims (3)
1. a kind of multilayer flap optical fiber with big mode field area, it is characterized in that：The fiber optic hub is high index of refraction fibre core (1),
The interior low-refraction groove of inner cladding (2) and high index of refraction ring are arranged in order from inside to outside, and the number of plies of high index of refraction ring is N, by M
Suppress channel segmentation into N × M flap core, be followed successively by (11,21,31,41) ... (16,26,36,46), outermost from inside to outside
Face is surrounding layer (3)；Wherein 1≤N≤6,1≤M≤4.
2. optical fiber according to claim 1, it is characterized in that：High index of refraction fibre core (1), high index of refraction valve (11,21 ...,
M1), (12,22 ..., M2) ..., the refractive index of (1N, 2N ..., MN) it is equal.The refractive index of high index of refraction fibre core (1)
More than the refractive index of inner cladding (2), more than the refractive index of surrounding layer (3).
3. optical fiber according to claim 1, it is characterized in that：The thickness of all high index of refraction rings is equal；All highs index of refraction
The distance between ring is equal, equal to the distance between fibre core (1) and first layer high index of refraction ring；All width phases for suppressing passage
Deng.Wherein core diameter is less than 50 microns, and the thickness of high index of refraction ring is more than 5 microns less than 20 microns, between high index of refraction ring
Distance be more than 1 micron be less than 10 microns, suppress passage width be more than 1 micron be less than 10 microns.
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| CN201710850908.5A CN107505673A (en) | 2017-09-20 | 2017-09-20 | A kind of large mode field multilayer flap optical fiber |
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| CN201710850908.5A CN107505673A (en) | 2017-09-20 | 2017-09-20 | A kind of large mode field multilayer flap optical fiber |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021590A (en) * | 2007-02-07 | 2007-08-22 | 燕山大学 | Optical fiber capable of effectively transmitting 2-3 um wavelength |
| CN102305958A (en) * | 2011-09-01 | 2012-01-04 | 北京交通大学 | Large mode field area single-mode chrysanthemum fiber core distribution fiber and manufacturing method thereof |
| CN102023334B (en) * | 2010-12-15 | 2012-05-23 | 江苏大学 | Large-mode field fiber |
| CN105607183A (en) * | 2016-01-07 | 2016-05-25 | 北京交通大学 | Anti-bending lobe-shaped large-mode-field single-mode fiber |
| CN107132613A (en) * | 2017-06-08 | 2017-09-05 | 中国电子科技集团公司电子科学研究院 | A kind of leakage path type optical fiber and its production method |
-
2017
- 2017-09-20 CN CN201710850908.5A patent/CN107505673A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021590A (en) * | 2007-02-07 | 2007-08-22 | 燕山大学 | Optical fiber capable of effectively transmitting 2-3 um wavelength |
| CN102023334B (en) * | 2010-12-15 | 2012-05-23 | 江苏大学 | Large-mode field fiber |
| CN102305958A (en) * | 2011-09-01 | 2012-01-04 | 北京交通大学 | Large mode field area single-mode chrysanthemum fiber core distribution fiber and manufacturing method thereof |
| CN105607183A (en) * | 2016-01-07 | 2016-05-25 | 北京交通大学 | Anti-bending lobe-shaped large-mode-field single-mode fiber |
| CN107132613A (en) * | 2017-06-08 | 2017-09-05 | 中国电子科技集团公司电子科学研究院 | A kind of leakage path type optical fiber and its production method |
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Application publication date: 20171222 |