CN103698840B - A kind of multi-core nonlinear optical fiber - Google Patents
A kind of multi-core nonlinear optical fiber Download PDFInfo
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- CN103698840B CN103698840B CN201310604849.5A CN201310604849A CN103698840B CN 103698840 B CN103698840 B CN 103698840B CN 201310604849 A CN201310604849 A CN 201310604849A CN 103698840 B CN103698840 B CN 103698840B
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Abstract
The present invention relates to a kind of many fibre cores nonlinear optical fiber, including fibre core, air cladding layer and pure quartz glass covering, fibre core is at least 3, in air cladding layer is divided into, outer air covering, interior air cladding layer is made up of the inner air vent being positioned at dot matrix, outer air covering is made up of the outer pore being positioned at outer dot matrix, interior dot matrix is the regular hexagon dot matrix including central point, in interior dot matrix, the center distance of any two consecutive points is equal, outer dot matrix is the regular hexagon dot matrix that correspondence is centered around outside interior dot matrix, in outer dot matrix, the center distance of any two consecutive points is equal, in interior dot matrix institute a little except laying in addition to fibre core, remaining all lays inner air vent, fibre core is laid around central point, and the center distance of any two adjacent fibre cores is equal, in outer dot matrix, institute is somewhat uniform sets outer pore.The present invention solves the low-loss between big core diameter tail optical fiber and the nonlinear microstructures optical fiber of high-capacity optical fiber laser and continues problem, can bear higher pump power, can be effectively realized the dispersion characteristics of optical fiber simultaneously.
Description
Technical field
The present invention relates to a kind of many fibre cores nonlinear optical fiber, belong to technical field of optical fiber.
Background technology
Microstructured optical fibers is a kind of relatively new optical fiber structure, its covering is contained within the airport array axially arranged along optical fiber, the characteristic such as nonlinear factor and dispersion of optical fiber can be effectively changed by the regulation and control pitch (distance between adjacent air holes center) of airport array, dutycycle (or referred to as air filling fraction), such as the zero-dispersion wavelength of optical fiber can be adjusted near 1 μm, near the output wavelength of the ytterbium-doping optical fiber laser being located exactly at common psec locked mode.Existing research (REVIEWS
OF MODERN PHYSICS, VOLUME 78, P1135-1184, OCTOBER–DECEMBER
2006) show, when the output wavelength of ytterbium-doping optical fiber laser is in the anomalous dispersion region of microstructured optical fibers, and when zero dispersion point, can effectively utilize the spectrum of soliton mechanism broadening incident pulse, be very suitable for producing super continuum source.The output spectrum scope of Supercontinuum source is the widest, and be all widely used value in fields such as bio-photon, military field, optical detection, Fibre Optical Sensor, optic communications.
For the ytterbium-doping optical fiber laser of psec locked mode, at present by the method improving pulse recurrence frequency, thus reduce pulse peak power, it is prevented effectively from nonlinear effect adverse effect, its average output power can be made to reach hectowatt magnitude, and the core diameter of the gain fibre of its afterbody can reach 30 μm.With psec optical fiber laser as the pumping source of super continuum source, its tail optical fiber is directly and zero dispersion point is positioned at the high non-linearity microstructured optical fibers welding near 1.06 μm, is the common method producing super continuum source at present.
But existing problems are: microstructured optical fibers used is single core design, for making zero dispersion point design near 1 μm, its core diameter is typically smaller than 5 μm, and the core diameter of Yb dosed optical fiber reaches near 30 μm.Fused fiber splice the most big for both fibre core difference is got up and ensures the lowest welding added losses, difficulty is very big, and extremely low welding added losses are the essential conditions realizing the super continuous output of high power, because under high pump power, less added losses also result in fusion point and are burned out.Common solution is to use special optical fiber splicer, is subsided by the air cap at junction microstructured optical fibers, forms a transition region, could be welding together with Yb dosed optical fiber.Nonetheless, the loss of this connected mode is the highest so that laser instrument cannot work long hours under high-power, only in the of short duration experiment of laboratory, it is impossible to meet the practicality of engineering.
The problem that simultaneously there is another one important is that frequency conversion efficiency is inversely proportional to the core diameter of optical fiber, and bearing high incident power then needs bigger core diameter, defines conflict.The usual fibre core of nonlinear optical fiber of single is less, and to ensure higher frequency conversion efficiency, but little fibre core cannot bear high incident power, even if connectivity problem has obtained effective solution.
Above two class problems are one of primary fiber technology barriers limiting the development of high power super continuum light fibre laser.The two problem to be solved, most suitable way is to develop the microstructured optical fibers that a kind of fibre core is big, making nonlinear microstructures optical fiber less with the fibre core difference of Yb dosed optical fiber, thus two kinds of optical fiber can preferably mate when welding, the loss and the pump light that reduce contact are revealed.But when the simple core diameter increasing single-core fiber, not single non-linear reduction that can make optical fiber, and the zero-dispersion wavelength of optical fiber can be made to move to long wave direction so that the pumping wavelength of ytterbium-doping optical fiber laser falls less than in the anomalous dispersion region of microstructured optical fibers, is unfavorable for producing super continuous spectrums.
Chinese patent (application number 200810053629.7) discloses the large effective area high non-linear photon crystal optical fiber of a kind of small core radial bundling type, the core diameter of its single fibre core is about 1～2 μm, this is conducive to adjusting near the 800nm of the zero-dispersion wavelength of optical fiber, but is detrimental to the super continuous wave laser application of 1 μm of operation wavelength；And its less core diameter is also unfavorable for bearing higher pump power；Consider its concrete summary of the invention and embodiment and accompanying drawing, inside and outside it, the pitch of big spilehole is inconsistent, in fact this invention also cannot ensure that the pitch of its inner air and outer air covering is consistent, this brings substantial difficulty for its actual preparation, finally, how this invention does not realizes single-mode output to it and makes any explanation, and ensures that the output mode of many fibre cores microstructured optical fibers is that single mode is necessary to should being used to say that of super continuous laser.
Summary of the invention
Introduce summary of the invention for convenience, define and explain that relational language is as follows:
Air cladding layer: refer to the cladding structure being made up of pore；
Interior air cladding layer hole diameter d1: refer to form the diameter of the pore of air cladding layer in optical fiber；
Outer air covering hole diameter d2: refer to form the diameter of the pore of optical fiber outer air covering；
Interior air cladding layer pitch lambda1: refer to any two adjacent air holes center distance in interior air cladding layer；
Outer air covering pitch lambda2: refer to any two adjacent air holes center distance in interior air cladding layer；
Λ in the present invention1Λ can be equal to2, now it is referred to as Λ；
Interior air cladding layer filling rate f1=d1/Λ1；
Outer air covering filling rate f2=d2/Λ2；
Core diameter dc: referring to the quartz areas that formed by one pore of disappearance, it is a diameter of in its six pores, the inside edge of two the most symmetrical pores away from；Wherein the diameter of the RC fibre core of optical fiber is alternatively referred to as dcc。
Especially, a diameter of d of six pores of center fibre core it is defined around1c。
The technical problem to be solved is that the deficiency existed for above-mentioned prior art proposes many fibre cores nonlinear optical fiber that a kind of output mode is single mode, its zero-dispersion wavelength clad nonlinear microstructured optical fibers near 1 μm.It can preferably mate with the big core diameter tail optical fiber of high-capacity optical fiber laser and carries out low-loss and continue, and bears higher pump power, thus realizes the super continuous laser output of several times higher than single core nonlinear optical fiber.
The present invention solves that the technical scheme that above-mentioned technical problem is used is as follows:
Including fibre core, air cladding layer and the total covering of pure quartz glass, it is characterized in that described fibre core is at least 3 fibre cores, described air cladding layer is divided into interior air cladding layer and outer air covering, described interior air cladding layer is made up of the inner air vent being positioned at dot matrix, described outer air covering is made up of the outer pore being positioned at outer dot matrix, described interior dot matrix is the regular hexagon dot matrix including central point, the regular hexagon dot matrix of interior dot matrix is 3～10 layers from the inside to the outside, center distance Λ of any two consecutive points in interior dot matrix1Equal, described outer dot matrix is the regular hexagon dot matrix that correspondence is centered around outside interior dot matrix, and the regular hexagon dot matrix of outer dot matrix is 1～3 layer from the inside to the outside, center distance Λ of any two consecutive points in outer dot matrix2Equal, a little in addition to laying fibre core, remaining all lays inner air vent to the institute in described interior dot matrix, and fibre core is laid around central point, and the center distance of any two adjacent fibre cores is equal, and in described outer dot matrix, all of point all lays exogenous QI hole.
By such scheme, described fibre core is made up of the quartz glass or pure quartz glass mixing germanium, and fibre core is 0 ~ 3% relative to the refractive index contrast Δ of the total covering of pure quartz glass.
By such scheme, described fibre core is 3,4,6,7,18,19,36 or 37；Wherein fibre core is to include 1 fibre core being positioned at central point when 4, the spacing that center distance is remaining fibre core and central point fibre core of any two adjacent fibre cores.
By such scheme, when described fibre core is 3 or 4,3 fibre cores are positioned in the 1st layer of regular hexagon dot matrix of dot matrix；When described fibre core is 6 or 7,6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix；When described fibre core is 18 or 19,6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, and 12 fibre cores are positioned in the 4th layer of regular hexagon dot matrix of dot matrix；When described fibre core is 36 or 37,6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, and 12 fibre cores are positioned in the 4th layer of regular hexagon dot matrix of dot matrix, 18 fibre cores are positioned in the 6th layer of regular hexagon dot matrix of dot matrix.
By such scheme, the diameter d of described fibre corecBeing 2～6 μm, the diameter of each fibre core is identical, or the diameter of each fibre core is identical in addition to central point fibre core.
By such scheme, the inner air vent diameter d of described interior air cladding layer1Meet: 0.3 μm < d1<Λ1, the inner air vent diameter d in interior 1st layer of regular hexagon dot matrix in described interior air cladding layer1cWith the inner air vent diameter d of air cladding layer in other1Between meet relation | d1c-d1|≤1μm.Adjust d in this range1cAnd d1Between magnitude relationship, the shaping to fiber mode can be realized so that output anticipated shape single mode hot spot.
By such scheme, air filling fraction f of described interior air cladding layer1Meet: 0.1 < f1<0.75。
By such scheme, the outer hole diameter d of described outer air covering2Meet: 0.3 μm < d2<Λ2, air filling fraction f of described outer air covering2Meet: 0.3 < f2< 0.9, and 0 < (f2-f1)<0.8。
By such scheme, the pitch lambda of described interior air cladding layer1Meet: 1 μm < Λ1<6μm；The pitch lambda of described outer air covering2Meet: 1 μm < Λ2<6μm。
By such scheme, described interior air cladding layer and the pitch lambda of outer air covering1、Λ2Between meet: 0≤| Λ2-Λ1|≤2μm.Usually take Λ1=Λ2=Λ。
By such scheme, the external diameter of described total covering is 70～300 μm.
By such scheme, the zero-dispersion wavelength of the same phase super model of described optical fiber is a λ0, between 900nm～1200nm.
By such scheme, the zero-dispersion wavelength of the same phase super model of described optical fiber is two, λ01And λ02, meet 800 < λ respectively01< 1000nm wave band, 1030 < λ02< 1700nm wave band.
By such scheme, the same phase super model of described optical fiber is without zero-dispersion wavelength, and its abbe number D(ps/nm/km) meet at any wavelength: the dispersion characteristics of D < 0, i.e. optical fiber are full normal dispersion.
By such scheme, the same phase super model of described optical fiber is without zero-dispersion wavelength, and its abbe number D(ps/nm/km) any wavelength meet D < when 0, its chromatic dispersion gradient S(ps/nm2/ km) when being zero, i.e. S=S0When=0, S0Corresponding wavelength X00Meet: 1000nm < λ00<1200nm。
By such scheme, the far field single-mode output of described optical fiber, its beam quality factor M2<1.7。
The beneficial effects of the present invention is: 1, propose a kind of to there is multiple fibre core, single-mode output, zero-dispersion wavelength can be realized near 1 μm, the nonlinear microstructures optical fiber of double air cladding layer.Form super model by evanescent field coupling between multiple fibre cores and realize single-mode output, by the optimization to optical fiber structure, the zero-dispersion wavelength making super model falls near 1 μm, so achieve that the dispersion characteristics as single nonlinear microstructures optical fiber, solve the low-loss between big core diameter tail optical fiber and the nonlinear microstructures optical fiber of high-capacity optical fiber laser to continue problem, can bear higher pump power, realization and through engineering approaches for high power super continuum light fibre laser open road；2, the zero-dispersion wavelength of optical fiber super model is near 1 μm, can realize the dispersion characteristics as single nonlinear microstructures optical fiber, is therefore suitable for using ytterbium-doping optical fiber laser pumping；And use multicore structure, and it is aided with double clad design, the core diameter that can make optical fiber increases several times, with 30 μm about Yb dosed optical fiber welding time, it is easier to coupling, thus splice loss, splice attenuation can effectively reduce, significantly reduce the pump light at fusion point and reveal, overcoming when pumping light power increases, fusion point is by the problem of laser burnout.And multiple fibre core has shared high incident pump power, can realize the super continuous laser output of several times higher than single core nonlinear optical fiber the most in theory；3, when the parameter such as pitch of interior air cladding layer is contracted to suitable dimension, the zero-dispersion wavelength that can realize corresponding optical fiber becomes two, or does not has zero dispersion point, it is achieved the dispersion characteristics of full normal dispersion.Now, total size of fibre core can also be about at 6 ~ 7 microns, so compared with the full normal dispersion microstructured optical fibers of common single-core fiber (fuse is about at 1.5 ~ 2 micrometer ranges), the advantage of multicore full normal dispersion microstructured optical fibers is the most apparent: can not only improve pump power, and then the power of super continuous laser output can be improved, and be provided that good beam quality, and produced super continuous spectrums has good coherence, can be used to do pulse compression.Utilize the optical fiber technology of the present invention, be expected to use high-power psec ytterbium-doping optical fiber laser this type of multi-core nonlinear optical fiber of direct-coupling pumping, it is achieved practical high-power super continuum source.
Accompanying drawing explanation
Fig. 1 is seven core fibre structural representation described in one embodiment of the invention.
Fig. 2 is the enlarged diagram in Tu1Zhong fibre-optical microstructure district, wherein, d1For interior air cladding layer hole diameter；d2For outer air covering hole diameter；Λ1For interior air cladding layer pitch；Λ2For outer air covering pitch；dcFor core diameter, wherein a diameter of d of the RC fibre core of optical fibercc；d1cDiameter for six pores around center fibre core.
Fig. 3 is three core fibre structural representations of the present invention.
Fig. 4 is four-core fiber structural representation of the present invention.
Fig. 5 is six core fibre structural representations of the present invention.
Fig. 6 is 18 core fibre structural representations of the present invention.
Fig. 7 is 19 core fibre structural representations of the present invention.
Fig. 8,9 is the end face amplification picture of the optical fiber of the present invention of actual preparation.
Figure 10 is optical fiber same phase super model of the present invention, namely dispersion curve figure (corresponding geometric parameter: the Λ of lowest-order super model (basic mode)1=3μm; f1=0.55; d1=1.65μm；d1c=1.73 μm).Discrete point represents test result, continuous print curve representation theory fitting result.
Figure 11 is to work as Λ1=1.5μm、 f1=0.55、d1=0.82μm、d1cDuring=0.88 μm, there is the curve chart of two zero-dispersion wavelengths in optical fiber.
Figure 12 is to work as Λ1=1.4μm、 f1=0.55、d1=0.38μm、d1cDuring=0.4 μm, the dispersion curve of optical fiber becomes the curve chart of full normal dispersion.
Figure 13, Figure 14 are respectively in the case of setting two kinds of parameters of air cladding layer, adjust d in the range of ± 5%1cDuring size, the mode distributions curve chart of corresponding same phase super model.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further illustrated.
Generally for the microstructured optical fibers of single, the air filling fraction 0.42 of usual air cladding layer is critical (d is hole diameter, and Λ is the pitch of pore) of single mode and multimode, when filling rate is less than 0.42, microstructured optical fibers single-mode output, as d/ Λ > 0.42, microstructured optical fibers multimode output.When combining bending, owing to bending can effectively suppress the pattern of high-order, only leave basic mode in making fibre core, therefore air filling fraction can be properly increased.
First embodiment of the invention radial section structure is as shown in Figure 1, 2, including fibre core 10, air cladding layer and the total covering of pure quartz glass 13, described fibre core is 7, described air cladding layer divides and includes interior air cladding layer and outer air covering, described interior air cladding layer is made up of the inner air vent 11 being positioned at dot matrix, described outer air covering is made up of the outer pore 12 being positioned at outer dot matrix, described interior dot matrix is the regular hexagon dot matrix including central point, the regular hexagon dot matrix of interior dot matrix is 5 layers from the inside to the outside, center distance Λ of any two consecutive points in interior dot matrix1Equal, described outer dot matrix is the regular hexagon dot matrix that correspondence is centered around outside interior dot matrix, and the regular hexagon dot matrix of outer dot matrix is 1 layer, center distance Λ of any two consecutive points in outer dot matrix2Equal.The distance of inside and outside dot matrix part can be equal to Λ1Or more than Λ1.7 described fibre cores, 1 fibre core is positioned at the central point of dot matrix, 6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, 6 fibre cores are laid around central point, and the center distance of any two adjacent fibre cores is equal, remaining somewhat uniform inner air vent that sets in interior dot matrix, in described outer dot matrix, all of point all lays exogenous QI hole.Table 1 show four specific embodiments in first embodiment, is the situation of seven fibre cores.
Single microstructured optical fibers is difficult to realize low loss welding, improves merely its core diameter its zero-dispersion wavelength the most uncontrollable and is near 1 micron, it is achieved pumping wavelength and the coupling of zero dispersion point.And multi-core nonlinear optical fiber of the present invention has the dispersion curve (being easy to nonlinear phase coupling) being close with single-core fiber；And (it is easy to heat radiation) with in power dissipation during hectowatt psec optical fiber laser pump to multiple fibre cores；And the diameter of seven core microstructured optical fibers fibre cores is closer to the fibre core (being easy to coupling, not easy damaged solder joint) of pumped optical fibre laser tail optical fiber, thus it is expected to realize super high power super continuum source；The design of double clad makes outer air covering effectively can divide the leakage of pump light by blocking part, plays the effect avoiding burning fusion point.
For seven core nonlinear optical fibers, its structural parameters and testing result show the excellent optical performance of multi-core nonlinear optical fiber of the present invention, have reached desired design target, and the advantage possessing practical application.
Table 1
The structure of other five embodiments is shown in Fig. 3,4,5,6,7 respectively.
Second embodiment is as it is shown on figure 3, described fibre core is 3, and 3 fibre cores are positioned in the 1st layer of regular hexagon dot matrix of dot matrix, and the line of 3 fibre cores is equilateral triangle, and the center distance of any two adjacent fibre cores is equal.Remaining somewhat uniform inner air vent that sets in interior dot matrix, described outer dot matrix is 1 layer, and in outer dot matrix, all of point all lays exogenous QI hole.Other structure is same or like with a upper embodiment.
3rd embodiment is as shown in Figure 4, described fibre core is 4, include 1 fibre core being positioned at central point, 3 fibre cores are positioned in the 1st layer of regular hexagon dot matrix of dot matrix, in this embodiment, 3 fibre cores in the spacing that center distance is remaining fibre core and central point fibre core of any two adjacent fibre cores, namely the 1st layer of regular hexagon dot matrix are Λ with the spacing of central point fibre core1.Other structure is identical with second embodiment.
4th embodiment is as it is shown in figure 5, described fibre core is 6, and 6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix；6 fibre cores are laid around central point, and the center distance of any two adjacent fibre cores is equal, remaining the somewhat uniform inner air vent that sets in interior dot matrix, and described outer dot matrix is 1 layer, and in outer dot matrix, all of point all lays exogenous QI hole.Other structure is same or like with first embodiment.
Five, the six embodiments are as shown in Figure 6,7, the regular hexagon dot matrix of interior dot matrix is 7 layers from the inside to the outside, described fibre core is respectively 18 and 19, the position of 18 fibre cores is identical, wherein 6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, and 12 fibre cores are positioned in the 4th layer of regular hexagon dot matrix of dot matrix；19 core structure include 1 fibre core being positioned at central point.Fibre core is laid around central point, and the center distance of any two adjacent fibre cores is equal.Remaining somewhat uniform inner air vent that sets in interior dot matrix, described outer dot matrix is 1 layer, and in outer dot matrix, all of point all lays exogenous QI hole.Other structure is same or like with first embodiment.
When described fibre core is respectively 36 and 37, the regular hexagon dot matrix of interior dot matrix is 9 layers from the inside to the outside, the position of 36 fibre cores is as follows, 6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, 12 fibre cores are positioned in the 4th layer of regular hexagon dot matrix of dot matrix, and 18 fibre cores are positioned in the 6th layer of regular hexagon dot matrix of dot matrix；37 core structure include 1 fibre core being positioned at central point.Fibre core is laid around central point, and the center distance of any two adjacent fibre cores is equal, remaining the somewhat uniform inner air vent that sets in interior dot matrix, and described outer dot matrix is 1 layer, and in outer dot matrix, all of point all lays exogenous QI hole.Other structure is same or like with first embodiment.
Claims (8)
1. fibre core nonlinear optical fiber more than a kind, including fibre core, air cladding layer and the total covering of pure quartz glass, it is characterized in that described fibre core is at least 3 fibre cores, described air cladding layer is divided into interior air cladding layer and outer air covering, described interior air cladding layer is made up of the inner air vent being positioned at dot matrix, described outer air covering is made up of the outer pore being positioned at outer dot matrix, described interior dot matrix is the regular hexagon dot matrix including central point, the regular hexagon dot matrix of interior dot matrix is 3～10 layers from the inside to the outside, center distance Λ of any two consecutive points in interior dot matrix1Equal, described outer dot matrix is the regular hexagon dot matrix that correspondence is centered around outside interior dot matrix, and the regular hexagon dot matrix of outer dot matrix is 1～3 layer from the inside to the outside, center distance Λ of any two consecutive points in outer dot matrix2Equal, a little in addition to laying fibre core, remaining all lays inner air vent to the institute in described interior dot matrix, and fibre core is laid around central point, and the center distance of any two adjacent fibre cores is equal, and in described outer dot matrix, all of point all lays exogenous QI hole；Described fibre core is 3,4,6,7,18,19,36 or 37；Wherein fibre core is to include 1 fibre core being positioned at central point when 4, the spacing that center distance is remaining fibre core and central point fibre core of any two adjacent fibre cores；When described fibre core is 3 or 4,3 fibre cores are positioned in the 1st layer of regular hexagon dot matrix of dot matrix；When described fibre core is 6 or 7,6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix；When described fibre core is 18 or 19,6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, and 12 fibre cores are positioned in the 4th layer of regular hexagon dot matrix of dot matrix；When described fibre core is 36 or 37,6 fibre cores are positioned in the 2nd layer of regular hexagon dot matrix of dot matrix, and 12 fibre cores are positioned in the 4th layer of regular hexagon dot matrix of dot matrix, and 18 fibre cores are positioned in the 6th layer of regular hexagon dot matrix of dot matrix.
2. as the many fibre cores nonlinear optical fiber described in claim 1, it is characterised in that described fibre core is made up of the quartz glass or pure quartz glass mixing germanium, and fibre core is 0 ~ 3% relative to the refractive index contrast Δ of the total covering of pure quartz glass.
3. the many fibre cores nonlinear optical fiber as described in claim 1 or 2, it is characterised in that a diameter of 2～6 μm of described fibre core.
4. the many fibre cores nonlinear optical fiber as described in claim 1 or 2, it is characterised in that the inner air vent diameter d of described interior air cladding layer1Meet: 0.3 μm < d1<Λ1, the inner air vent diameter d in interior 1st layer of regular hexagon dot matrix in described interior air cladding layer1cWith the inner air vent diameter d of air cladding layer in other1Between meet relation | d1c-d1|≤1μm。
5. the many fibre cores nonlinear optical fiber as described in claim 1 or 2, it is characterised in that air filling fraction f of described interior air cladding layer1Meet: 0.1 < f1<0.75；The outer hole diameter d of described outer air covering2Meet: 0.3 μm < d2<Λ2, air filling fraction f of described outer air covering2Meet: 0.3 < f2< 0.9, and 0 < (f2-f1)<0.8。
6. the many fibre cores nonlinear optical fiber as described in claim 1 or 2, it is characterised in that the pitch lambda of described interior air cladding layer1Meet: 1 μm < Λ1<6μm；The pitch lambda of described outer air covering2Meet: 1 μm < Λ2<6μm；Described interior air cladding layer and the pitch lambda of outer air covering1、Λ2Between meet: 0≤| Λ2-Λ1|≤2μm。
7. the many fibre cores nonlinear optical fiber as described in claim 1 or 2, it is characterised in that the zero-dispersion wavelength of the same phase super model of described optical fiber is a λ0, between 900nm～1200nm；Or the zero-dispersion wavelength of the same phase super model of described optical fiber is two, λ01And λ02, meet 800 < λ respectively01< 1000nm wave band, 1030 < λ02< 1700nm wave band；Or the same phase super model of described optical fiber is without zero-dispersion wavelength, and its abbe number D meets at any wavelength: the dispersion characteristics of D < 0, i.e. optical fiber are full normal dispersion.
8. the many fibre cores nonlinear optical fiber as described in claim 1 or 2, it is characterised in that the same phase super model of described optical fiber without zero-dispersion wavelength, and its abbe number D any wavelength meet D < when 0, when its chromatic dispersion gradient S is zero, i.e. S=S0When=0, S0Corresponding wavelength X00Meet: 1000nm < λ00<1200nm；The far field single-mode output of described optical fiber, its beam quality factor M2<1.7。
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| CN107490820B (en) * | 2017-10-13 | 2020-02-25 | 燕山大学 | All-solid-state large-mode-area near-zero dispersion flat microstructure optical fiber |
| CN109188604B (en) * | 2018-10-23 | 2021-02-05 | 聊城大学 | Low-loss low-crosstalk six-core strong-coupling two-mode optical fiber |
| CN111505761B (en) * | 2019-09-27 | 2021-12-10 | 武汉光谷长盈通计量有限公司 | Optical fiber with higher numerical aperture and preparation method thereof |
| CN113126198B (en) * | 2019-12-31 | 2022-07-05 | 武汉安扬激光技术股份有限公司 | Single-mode optical fiber with large fiber core diameter |
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