CN102262263B - Optical fibre with multiple-sector fiber core at periphery of multiple-sector area of circular fiber core, and fabrication method thereof - Google Patents
Optical fibre with multiple-sector fiber core at periphery of multiple-sector area of circular fiber core, and fabrication method thereof Download PDFInfo
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Abstract
An optical fibre with a multiple-sector fiber core at the periphery of a multiple-sector area of the circular fiber core, and a fabrication method thereof belong to the fields of the high-power broadband fiber laser and the special optical fibre, which overcome the problem that a single-core doubly-clad optical fibre with multiple rare-earth ion doped regions is limited to bear optical power and the problem that a block clad optical fibre core layer has a limited diameter. Sector rare-earth ion doped regions 1 to N are all the same in optical refractive index, radius and radian, and form a complete circular fibre core, wherein N is an integer greater than or equal to 3 and less than or equal to 9; sector fibre cores 1 to M having the same radius and the same radian a are evenly distributed around the circular fibre core in an inner cladding layer, wherein M is an integer greater than or equal to N or less than or equal to 32 and a is greater than or equal to pi/2M and less than or equal to 2pi/M; distances between the vertexes of the sector fibre cores 1 to M and the outer circle of the circular fibre core are equal; and the circular fibre core is equal to the sector fibre cores 1 to M in rare-earth ion doping type set. The fabrication method comprises fabricating circular fibre core fine rods and sector fibre core fine rods and organizing the fine rods into the optical fibre. The yield of the optical fibre is high and the welding loss of the optical fiber with a single-mode optical fibre is low; and single-mode operation in large-mode area is realized.
Description
Technical field
The present invention relates to how fan-shaped doped core optical fiber in a kind of periphery, many fan sections of round core and preparation method thereof, belong to high-power broadband optical fiber amplifier, laser instrument, special optical fiber field.
Background technology
Rare earth doped fiber amplifier or laser instrument adopt doped rare earth element (Nd, Sm, Ho, Er, Pr, Tm, Yb etc.) ion optical fiber, utilize stimulated radiation mechanism to realize the direct amplification of light.
The absorption cross section of every kind of REE and emission cross section are all inequality, cause the operation wavelength of corresponding optical fiber also different.For example, the neodymium-doped fiber operation wavelength is 1000-1150nm, 1320-1400nm; Er-doped fiber operation wavelength 550nm, 850nm, 980-1000nm, 1500-1600nm, 1660nm, 1720nm, 2700nm; The Yb dosed optical fiber operation wavelength is 970-1040nm; Mixing thorium fiber work wavelength is 455nm, 480nm, 803-825nm, 1460-1510nm, 1700-2015nm, 2250-2400nm; Mixing praseodymium fiber work wavelength is 490nm, 520nm, 601-618nm, 631-641nm, 707-725nm, 880-886nm, 902-916nm, 1060-1110nm, 1260-1350nm; Mixing holmium fiber work wavelength is 550nm, 753nm, 1380nm, 2040-2080nm, 2900nm.Mixing samarium fiber work wavelength is 651nm,
Mix the rare earth ion of different glass matrixs, its gain bandwidth (GB) and character are also variant.The Er-doped fiber of pure silicon optical fiber glass matrix for example; Its 1500nm gain half-wave spectrum width is 7.94nm; And the Er-doped fiber of aluminium phosphorus silicon optical fiber glass matrix; Its 1500nm gain half-wave spectrum width is 43.3nm [W.J.Miniscalco.Optical and electronic properties of rare-earth ions in glasses in rare-earth doped fiber lasers and amplifier.New York:Marcel Dekker.2001, pp:17-112].Existing doubly clad optical fiber perhaps is singly to mix rare earth, perhaps is double rare-earth-mixed.Even double rare-earth-mixed optical fiber; Also be to utilize two kinds of doped rare earth elements different to the absorption cross section of pumping source, and the interaction of the element energy level of two kinds of close, realize a kind of doped rare earth element absorptive pumping power; The purpose that another kind of element is excited to amplify is like erbium-ytterbium co-doped fiber.Therefore, existing doubly clad optical fiber amplifying signal bandwidth has only tens nm usually, and when will amplifying the different wavelengths signal, and the wavelength interval just need dispose different doubly clad optical fibers respectively when surpassing 100nm, carries out the signal merging again, and complex structure and cost are very high.
Chinese patent numbers 200910236162.4, proposed a kind of single-core multiple rare-earth-doped ion region double-clad optical fiber, this optical fiber can be realized the amplification of multiband light signal or be the gain media of multi-wave band laser; Yet receive the restriction of non-linear, structural element and diffraction limit, the luminous power of bearing is limited, the about 1W/m of single core continuous wave damaging thresholding
2[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 SPIE Vol.4974,50-59 (2003)]; its optical damage danger becomes a major challenge that realizes high-power single mode fiber laser. except optical damage,, even can finally melt fibre core because the heat that high-power light produces also can be damaged optical fiber.
Multicore optical fiber laser is realized single mode output, accomplished confirmation.The effective mode field area of the multi-core fiber that adopts in the document reaches 465 μ m
2[Vogel, Moritx M, Abdou-Ahmed, Marwan, Voss, Andreas, Graf, Thomas, " Very large mode area single-mode multicore fiber ", Opt.Lett.34 (18), 2876-2878 (2009)].Yet the multi-core fiber that this single-mode laser adopts, to the core diameter and the design accurately of the distance between the adjacent fibre core of fiber core, little to the allowable error of the distance between the fiber core, it is low to produce yield rate in batches.
The piecemeal cladded-fiber is a kind of novel optical fiber, chooses 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 are the losses that increases beyond the basic mode, realized in 50 micron fiber, realizing single mode operation at the sandwich layer diameter, yet the raising of its power are subject to the sandwich layer radius.
Summary of the invention
For overcoming that existing big mould field single mode multi-core fiber produces that yield rate is low, piecemeal cladded-fiber sandwich layer diameter is limited in batches and single-core multiple rare-earth-doped ion region double-clad optical fiber bears defectives such as luminous power is limited, how fan-shaped doped core optical fiber in a kind of periphery, many fan sections of round core and preparation method thereof has been proposed.
The objective of the invention is to realize through following technical scheme:
The how fan-shaped doped core optical fiber in circle periphery, many fan sections of core, this optical fiber comprises fibre core, inner cladding and surrounding layer.
First light refractive index to the fan-shaped rare-earth-doped ion region of N, radius all equate with radian, form a complete circle fibre core; The circular core radius is 2～20 microns; The integer of 3≤N≤9.
In the inner cladding around evenly distribute first to the M fan-shaped fibre core of same radius and identical radian measure of circular core; The integer of N≤M≤32.
The first fan-shaped fibre core, the second fan-shaped fibre core ..., the radius of the fan-shaped fibre core of M is 20～200 microns, radian is α, pi/2 M≤α≤2 π/M;
The first fan-shaped fibre core, the second fan-shaped fibre core ..., the summit of the fan-shaped fibre core of M equates that with the distance of the cylindrical of circular core distance is 2～20 microns.
Circular core, first light refractive index to the fan-shaped fibre core of M equate that its light refractive index is greater than the light refractive index of inner cladding, and the light refractive index of inner cladding is greater than the light refractive index of surrounding layer.
First is not identical entirely to the rare-earth ion-doped type of the fan-shaped rare-earth-doped ion region of N; Rare-earth ion-doped type comprises that neodymium ion, erbium ion, ytterbium ion, thorium ion, praseodymium ion, holmium ion, samarium ion, neodymium ytterbium mix ion or erbium and ytterbium codoping ion altogether.
First is not identical entirely to the rare-earth ion-doped type of the fan-shaped fibre core of M, first the rare-earth ion-doped type set and the first rare-earth ion-doped type set equality to the fan-shaped rare-earth-doped ion region of N to the fan-shaped fibre core of M.
The method for making of the how fan-shaped doped core optical fiber in circle periphery, many fan sections of core may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select N root sandwich layer radius to equate the rare-earth ion-doped preform of mixing that equates with light refractive index; The integer of 3≤N≤9;
The part covering of N root preform is removed, make the thickness of residue covering equate;
The N root preform that will remove the part covering is drawn into the thin rod that the sandwich layer radius equates with cladding thickness;
Above-mentioned N root preform is processed into the fan-shaped thin rod of N same radius and identical radian measure, and the radian of each fan-shaped thin rod is 2 π/N; N fan-shaped thin rod formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region;
Step 2 is made carefully rod of fan-shaped fibre core
Select M root sandwich layer radius to equate the rare-earth ion-doped preform of mixing that equates with light refractive index; The light refractive index of the N root preform sandwich layer that adopts in the integer of N≤M≤32, the light refractive index of the M root preform sandwich layer of selection and step 1 equates;
The covering of M root preform is removed only remaining sandwich layer;
Above-mentioned M root preform is drawn into the thin rod that radius equates;
Above-mentioned M root preform is processed into the fan-shaped thin rod of M same radius and radian, the radian of each fan-shaped thin rod is α, pi/2 M≤α≤2 π/M again;
Thin rod of the circular core that contains annular cladding region of completing steps one and M the thin rod of fan-shaped fibre core of step 2 are organized, put quartz ampoule, the gap is low with the fan-shaped thin rod of optics refractive index ratio, but the thin quartz pushrod higher than quartz ampoule light refractive index filled; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
Beneficial effect of the present invention is specific as follows:
The how fan-shaped doped core optical fiber in circle periphery, many fan sections of core need not coherence request, has improved the yield rate of optical fiber, and adopts the single mode circular core, rather than adopts big core diameter fibre core as the piecemeal cladded-fiber, has reduced the splice loss, splice attenuation with single-mode fiber; There is distance between single mode circular core and a plurality of fan-shaped fibre core, increases coupling each other on the one hand, realize the big mode field area single mode operation, help heat radiation on the other hand, protected optical fiber.
Description of drawings
Fig. 1 is the how fan-shaped doped core optical fiber sectional view in periphery, many fan sections of round core of three fan-shaped rare-earth-doped ion regions and three fan-shaped fibre cores.
Fig. 2 is the how fan-shaped doped core optical fiber sectional view in periphery, many fan sections of round core of four fan-shaped rare-earth-doped ion regions and six fan-shaped fibre cores.
Fig. 3 is the how fan-shaped doped core optical fiber sectional view in periphery, many fan sections of round core of six fan-shaped rare-earth-doped ion regions and 18 fan-shaped fibre cores.
Fig. 4 is the how fan-shaped doped core optical fiber sectional view in periphery, many fan sections of round core of nine fan-shaped rare-earth-doped ion regions and 32 fan-shaped fibre cores.
Embodiment
The present invention does not relate to the making of rare-earth ion-doped doped core optical fiber prefabricated rods, and these are the technology of patent or bibliographical information.
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
The how fan-shaped doped core optical fiber in periphery, many fan sections of round core of three fan-shaped rare-earth-doped ion regions (11,12,13) and three fan-shaped fibre cores (21,22,23), as shown in Figure 1;
11, the second fan-shaped er-doped ion district the 12, the 3rd, the first fan-shaped Nd ion doped district is fan-shaped mixes ytterbium ion district 13 light refractive indexes, radius all equates with radian, forms a complete circle fibre core; The circular core radius is 2 microns;
Center on the fan-shaped fibre core of even distribute three same radius and identical radian measure of circular core in the inner cladding 3; The radius of first fan-shaped fibre core 21, second fan-shaped fibre core the 22, the 3rd fan-shaped fibre core 23 is 20 microns; Radian is rare-earth ion-doped erbium ion, neodymium ion, the ytterbium ion of being respectively of fan-shaped fibre core 21, second fan-shaped fibre core the 22, the 3rd fan-shaped fibre core 23 in α=π/6, the first;
First fan-shaped fibre core 21, second fan-shaped fibre core the 22, the 3rd fan-shaped fibre core, 23 summits equate that with the distance of circular core cylindrical distance is 2 microns;
The light refractive index of circular core, first to the 3rd fan- shaped fibre core 21,22,23 equates that first fan-shaped fibre core 21 light refractive indexes are greater than the light refractive index of inner cladding 3, and the light refractive index of inner cladding 3 is greater than the light refractive index of surrounding layer 4.
The method for making of the how fan-shaped doped core optical fiber in periphery, many fan sections of round core of three fan-shaped rare-earth-doped ion regions (11,12,13) and three fan-shaped fibre cores (21,22,23) may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select equal er-doped ion preform, the Nd ion doped preform that equates with light refractive index of three sandwich layer radiuses, mix the ytterbium ion preform;
To and the part covering of three preforms be removed with Ginding process, make the thickness of residue covering equate;
Three preforms that will remove the part covering are drawn into the equal thin rod that equates with cladding thickness of sandwich layer radius, and the sandwich layer radius is 2mm, and cladding thickness is 2mm;
With the method for cut, above-mentioned three preforms are processed into the fan-shaped thin rod of three same radius and identical radian measure, the radian of each fan-shaped thin rod is 2 π/3; Three fan-shaped thin rods are formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region
Step 2 is made carefully rod of fan-shaped fibre core
Select the sandwich layer radius to equate er-doped ion preform, neodymium ion preform, the ytterbium ion preform that equates with light refractive index, the light refractive index of three preform sandwich layers that adopt in the light refractive index of three preform sandwich layers of selection and the step 1 equates;
To and the covering of three preforms be removed only remaining sandwich layer with the hydrofluorite corroding method;
Above-mentioned three preforms are drawn into the thin rod that radius equates, radius is 20mm;
Use the method for cut again, above-mentioned three preforms are processed into the fan-shaped thin rod of three same radius and radian, the radian of each fan-shaped thin rod is π/6;
With completing steps one and two the thin rod of circular core of annular cladding region organize with three thin rods of fan-shaped fibre core, put quartz ampoule, the thin quartz pushrod filling that the gap is low but higher than quartz ampoule light refractive index with the fan-shaped thin rod of optics refractive index ratio; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
Embodiment two
The how fan-shaped doped core optical fiber in periphery, many fan sections of round core of four fan-shaped rare-earth-doped ion regions (11,12,13,14) and six fan-shaped fibre cores (21,22,23,24,25,26), as shown in Figure 2;
11, the second fan-shaped er-doped ion district the 12, the 3rd, the first fan-shaped Nd ion doped district is fan-shaped mixes ytterbium ion district 13, four fan-shaped er-doped ion district 14 light refractive indexes, radius and all equates with radian, forms a complete circle fibre core; The circular core radius is 5 microns;
Center on the fan-shaped fibre core of even distribute six same radius and identical radian measure of circular core in the inner cladding 3; The fan-shaped fibre core of the first fan-shaped fibre core 21, second 22 ..., the radius of the 6th fan-shaped fibre core 26 is 60 microns; Radian be the fan-shaped fibre core of the fan-shaped fibre core in α=π/6, the first 21, second 22 ..., rare-earth ion-doped erbium ion, neodymium ion, ytterbium ion, erbium ion, neodymium ion, the ytterbium ion of being respectively of the 6th fan-shaped fibre core 26;
The fan-shaped fibre core of the first fan-shaped fibre core 21, second 22 ..., the 6th fan-shaped fibre core 26 summits equate that with the distance of circular core cylindrical distance is 4 microns;
The fan-shaped fibre core of circular core, the first fan-shaped fibre core 21, second 22 ..., the light refractive index of the 6th fan-shaped fibre core 26 equates; First fan-shaped fibre core 21 light refractive indexes are greater than the light refractive index of inner cladding 3, and the light refractive index of inner cladding 3 is greater than the light refractive index of surrounding layer 4.
The method for making of the how fan-shaped doped core optical fiber in periphery, many fan sections of round core of four fan-shaped rare-earth-doped ion regions (11,12,13,14) and six fan-shaped fibre cores (21,22,23,24,25,26) may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select equal er-doped ion preform, the Nd ion doped preform that equates with light refractive index of four sandwich layer radiuses, mix ytterbium ion preform, er-doped ion preform, Nd ion doped preform, mix the ytterbium ion preform;
To and the part covering of four preforms be removed with the hydrofluorite caustic solution, make the thickness of residue covering equate;
Four preforms that will remove the part covering are drawn into the equal thin rod that equates with cladding thickness of sandwich layer radius, and the sandwich layer radius is 5mm, and cladding thickness is 4mm;
With the method for cut, above-mentioned four preforms are processed into the fan-shaped thin rod of four same radius and identical radian measure, the radian of each fan-shaped thin rod is pi/2; Four fan-shaped thin rods are formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region
Step 2 is made carefully rod of fan-shaped fibre core
Select the sandwich layer radius to equate er-doped ion preform, neodymium ion preform, ytterbium ion preform, er-doped ion preform, neodymium ion preform, the ytterbium ion preform that equates with light refractive index, the light refractive index of the preform sandwich layer that adopts in the light refractive index of the preform sandwich layer here and the step 1 equates;
To and the covering of six roots of sensation preform be removed only remaining sandwich layer with the hydrofluorite corroding method;
Above-mentioned six roots of sensation preform is drawn into the thin rod that radius equates, radius is 60mm;
Use the method for cut again, above-mentioned six roots of sensation preform is processed into the fan-shaped thin rod of six same radius and radian, the radian of each fan-shaped thin rod is π/6;
With completing steps one and two the thin rod of circular core of annular cladding region organize with six thin rods of fan-shaped fibre core, put quartz ampoule, the thin quartz pushrod filling that the gap is low but higher than quartz ampoule light refractive index with the fan-shaped thin rod of optics refractive index ratio; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
Embodiment three
Six fan-shaped rare-earth-doped ion regions (11,12 ..., 16) and 18 fan-shaped fibre cores (21,22 ..., 218) the how fan-shaped doped core optical fiber in periphery, many fan sections of round core, as shown in Figure 1;
The first fan-shaped Nd ion doped district 11, second is fan-shaped mixes four fan-shaped ytterbium ion district the 14, the 5th fan-shaped neodymium ytterbium of mixing in the 12, the 3rd fan-shaped er-doped ion district 13,, holmium ion district and mixes ion district the 15, the 6th fan-shaped samarium ion district 16 light refractive indexes, the radius mixed altogether and all equate with radian, forms a complete circle fibre core; The circular core radius is 12 microns;
Center on the fan-shaped fibre core of even distribute 18 same radius and identical radian measure of circular core in the inner cladding 3; The fan-shaped fibre core of the first fan-shaped fibre core 21, second 22 ..., the radius of the 18 fan-shaped fibre core 18 is 100 microns; Radian be the fan-shaped fibre core of the fan-shaped fibre core in π/10, the first 21, second 22 ..., rare-earth ion-dopedly being respectively Nd ion doped, mixing holmium ion of the 18 fan-shaped fibre core 18, er-doped ion, mix that ytterbium ion, neodymium ytterbium are mixed ion altogether, mixed samarium ion, Nd ion doped, mix holmium ion, er-doped ion, mix ytterbium ion, the neodymium ytterbium is mixed ion altogether, mix samarium ion, Nd ion doped, mix holmium ion, er-doped ion, mix ytterbium ion, the neodymium ytterbium is mixed ion altogether, mix samarium ion;
The fan-shaped fibre core of the first fan-shaped fibre core 21, second 22 ..., the 18 fan-shaped fibre core 18 summits equate that with the distance of circular core cylindrical distance is 10 microns;
The fan-shaped fibre core of circular core, the first fan-shaped fibre core 21, second 22 ..., the light refractive index of the 18 fan-shaped fibre core 18 equates; First fan-shaped fibre core 21 light refractive indexes are greater than the light refractive index of inner cladding 3, and the light refractive index of inner cladding 3 is greater than the light refractive index of surrounding layer 4.
Six fan-shaped rare-earth-doped ion regions (11,12 ..., 16) and 18 fan-shaped fibre cores (21,22 ..., 218) the method for making of the how fan-shaped doped core optical fiber in periphery, many fan sections of round core, may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select Nd ion doped preform that six roots of sensation sandwich layer radius equates to equate with light refractive index, mix holmium ion preform, er-doped ion preform, mix the ytterbium ion preform, the neodymium ytterbium is mixed the ion preform altogether, mix the samarium ion preform;
To and the part covering of six roots of sensation preform be removed with Ginding process, make the thickness of residue covering equate;
The six roots of sensation preform that will remove the part covering is drawn into the equal thin rod that equates with cladding thickness of sandwich layer radius, and the sandwich layer radius is 12mm, and cladding thickness is 10mm;
With the method for cut, above-mentioned four preforms are processed into the fan-shaped thin rod of six same radius and identical radian measure, the radian of each fan-shaped thin rod is π/3; Six fan-shaped thin rods are formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region
Step 2 is made carefully rod of fan-shaped fibre core
Select Nd ion doped preform that the sandwich layer radius equates to equate with light refractive index, mix holmium ion preform, er-doped ion preform, mix the ytterbium ion preform, the neodymium ytterbium is mixed the ion preform altogether, mix the samarium ion preform, the Nd ion doped preform, mix holmium ion preform, er-doped ion preform, mix the ytterbium ion preform, the neodymium ytterbium is mixed the ion preform altogether, mix the samarium ion preform, the Nd ion doped preform, mix holmium ion preform, er-doped ion preform, mix the ytterbium ion preform, the neodymium ytterbium is mixed the ion preform altogether, mix the samarium ion preform, the light refractive index of the preform sandwich layer that adopts in the light refractive index of the preform sandwich layer here and the step 1 equates;
To and the covering of 18 preforms be removed only remaining sandwich layer with the hydrofluorite corroding method;
Above-mentioned 18 preforms are drawn into the thin rod that radius equates, radius is 100mm;
Use the method for cut again, above-mentioned 18 preforms are processed into the fan-shaped thin rod of 18 same radius and radian, the radian of each fan-shaped thin rod is π/10;
With completing steps one and two the thin rod of circular core of annular cladding region organize with 18 thin rods of fan-shaped fibre core, put quartz ampoule, the thin quartz pushrod filling that the gap is low but higher than quartz ampoule light refractive index with the fan-shaped thin rod of optics refractive index ratio; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
Embodiment four
Nine fan-shaped rare-earth-doped ion regions (11,12 ..., 19) and 32 fan-shaped fibre cores (21,22 ..., 232) the how fan-shaped doped core optical fiber in periphery, many fan sections of round core, as shown in Figure 1;
11, the second fan-shaped er-doped ion district the 12, the 3rd, the first fan-shaped Nd ion doped district is fan-shaped mixes ytterbium ion district 13, and four fan-shapedly mixes that the 14, the 5th fan-shaped praseodymium ion district the 15, the 6th, thorium ion district is fan-shaped mixes that holmium ion district the 16, the 7th is fan-shaped mixes that samarium ion district the 17, the 8th fan-shaped neodymium ytterbium is mixed the 18, the 9th fan-shaped erbium and ytterbium codoping ion district, ion district 19 light refractive indexes altogether, radius all equates with radian, forms a complete circle fibre core; The circular core radius is 20 microns;
In the inner cladding 3 around evenly the distribute fan-shaped fibre core of 32 each and every one same radius and identical radian measure of circular core; The fan-shaped fibre core of the first fan-shaped fibre core 21, second 22 ..., the radius of the 32 fan-shaped fibre core 232 is 200 microns; Radian be the fan-shaped fibre core 21 in π/16, the first rare-earth ion-doped, the second fan-shaped fibre core 22 rare-earth ion-doped ..., the rare-earth ion-doped neodymium ion, holmium ion, erbium ion, ytterbium ion, erbium and ytterbium codoping ion, neodymium ytterbium of being respectively of the 32nd fan-shaped fibre core 232 mix ion, samarium ion, thorium ion, praseodymium ion, erbium ion, ytterbium ion, erbium and ytterbium codoping ion, ytterbium ion, erbium and ytterbium codoping ion, thorium ion, praseodymium ion, erbium and ytterbium codoping ion, neodymium ytterbium altogether and mix ion, erbium and ytterbium codoping ion, neodymium ytterbium altogether and mix ion, samarium ion, thorium ion, praseodymium ion, erbium ion, ytterbium ion, erbium and ytterbium codoping ion, ytterbium ion, erbium and ytterbium codoping ion, thorium ion, praseodymium ion, erbium and ytterbium codoping ion, neodymium ytterbium altogether and mix ion altogether;
The fan-shaped fibre core of the first fan-shaped fibre core 21, second 22 ..., the 32 fan-shaped fibre core 232 summits equate that with the distance of circular core cylindrical distance is 20 microns;
The fan-shaped fibre core of circular core, the first fan-shaped fibre core 21, second 22 ..., the light refractive index of the 32 fan-shaped fibre core 232 equates; First fan-shaped fibre core 21 light refractive indexes are greater than the light refractive index of inner cladding 3, and the light refractive index of inner cladding 3 is greater than the light refractive index of surrounding layer 4.
Nine fan-shaped rare-earth-doped ion regions (11,12 ..., 19) and 32 fan-shaped fibre cores (21,22 ..., 232) the method for making of the how fan-shaped doped core optical fiber in periphery, many fan sections of round core, may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select Nd ion doped preform, er-doped ion preform that nine sandwich layer radiuses equate to equate with light refractive index, mix the ytterbium ion preform, mix the thorium ion preform, mix the praseodymium ion preform, mix the holmium ion preform, mix the samarium ion preform, the neodymium ytterbium is mixed the ion preform altogether, erbium and ytterbium codoping ion preform;
To and the part covering of nine preforms be removed with Ginding process, make the thickness of residue covering equate;
Nine preforms that will remove the part covering are drawn into the equal thin rod that equates with cladding thickness of sandwich layer radius thickness, and the sandwich layer radius is 20mm, and cladding thickness is 20mm;
With the method for cut, above-mentioned nine preforms are processed into the fan-shaped thin rod of nine same radius and identical radian measure, the radian of each fan-shaped thin rod is 2 π/9; Nine fan-shaped thin rods are formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region.
Step 2 is made carefully rod of fan-shaped fibre core
Select Nd ion doped preform that the sandwich layer radius equates to equate with light refractive index, mix holmium ion preform, er-doped ion preform, mix the ytterbium ion preform, erbium and ytterbium codoping ion preform, neodymium ytterbium are mixed the ion preform altogether, mix the samarium ion preform, mix the thorium ion preform, mix the praseodymium ion preform, er-doped ion preform, mix ytterbium ion preform, erbium and ytterbium codoping ion preform, ytterbium ion preform, erbium and ytterbium codoping ion preform, mix the thorium ion preform, mix the praseodymium ion preform, erbium and ytterbium codoping ion preform, neodymium ytterbium are mixed the ion preform altogether, erbium and ytterbium codoping ion preform, neodymium ytterbium are mixed the ion preform altogether, mix the samarium ion preform, mix the thorium ion preform, mix the praseodymium ion preform, er-doped ion preform, ytterbium ion preform, erbium and ytterbium codoping ion preform, mix ytterbium ion preform, erbium and ytterbium codoping ion preform, mix the thorium ion preform, mix the praseodymium ion preform, erbium and ytterbium codoping ion preform, neodymium ytterbium mix the ion preform altogether, the light refractive index of the preform sandwich layer that adopts in the light refractive index of the preform sandwich layer here and the step 1 equates;
To and the covering of 32 preforms be removed only remaining sandwich layer with the hydrofluorite corroding method;
Above-mentioned 32 preforms are drawn into the thin rod that radius equates, radius is 200mm;
Use the method for cut again, above-mentioned 32 preforms are processed into the fan-shaped thin rod of 32 same radius and radian, the radian of each fan-shaped thin rod is π/16;
With completing steps one and two the thin rod of circular core of annular cladding region organize with 32 thin rods of fan-shaped fibre core, put quartz ampoule, the thin quartz pushrod filling that the gap is low but higher than quartz ampoule light refractive index with the fan-shaped thin rod of optics refractive index ratio; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
Embodiment five
N fan-shaped rare-earth-doped ion region (11,12 ..., 1N) with M fan-shaped fibre core (21,22 ..., 2M) justify the how fan-shaped doped core optical fiber in periphery, many fan sections of core, this optical fiber comprises fibre core, inner cladding and surrounding layer;
First to the N fan-shaped rare-earth-doped ion region light refractive index, radius all equate with radian, form a complete circle fibre core; The circular core radius is 2～20 microns;
The integer of 3≤N≤9;
In the inner cladding around evenly distribute first to the M fan-shaped fibre core of same radius and identical radian measure of circular core;
The integer of N≤M≤32;
The first fan-shaped fibre core, the second fan-shaped fibre core ..., the radius of the fan-shaped fibre core of M is 20～200 microns, radian is α, pi/2 M≤α≤2 π/M;
The first fan-shaped fibre core, the second fan-shaped fibre core ..., the fan-shaped fibre core of M equates that with the distance of circular core cylindrical distance is 2～20 microns;
Circular core, first light refractive index to the fan-shaped fibre core of M equate that its light refractive index is greater than the light refractive index of inner cladding, and the light refractive index of inner cladding is greater than the light refractive index of surrounding layer.
First is not identical entirely to the rare-earth ion-doped type of the fan-shaped rare-earth-doped ion region of N; Rare-earth ion-doped type comprises that neodymium ion, erbium ion, ytterbium ion, thorium ion, praseodymium ion, holmium ion, samarium ion, neodymium ytterbium mix ion, erbium and ytterbium codoping ion altogether;
First is not identical entirely to the rare-earth ion-doped type of the fan-shaped fibre core of M, rare-earth ion-doped type set and the contained rare-earth ion-doped type set equality of first to the N fan-shaped rare-earth-doped ion region that first to the M fan-shaped fibre core is contained.
The method for making of the how fan-shaped doped core optical fiber in circle periphery, many fan sections of core may further comprise the steps:
The method for making of the how fan-shaped doped core optical fiber in circle periphery, many fan sections of core may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select N root sandwich layer radius to equate the rare-earth ion-doped preform of mixing that equates with light refractive index; The integer of 3≤N≤9;
The part covering of N root preform is removed, make the thickness of residue covering equate;
The N root preform that will remove the part covering is drawn into the equal thin rod that equates with cladding thickness of sandwich layer radius;
Above-mentioned N root preform is processed into the fan-shaped thin rod of N same radius and identical radian measure, and the radian of each fan-shaped thin rod is 2 π/N; N fan-shaped thin rod formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region;
Step 2 is made carefully rod of fan-shaped fibre core
Select M root sandwich layer radius to equate the rare-earth ion-doped preform of mixing that equates with light refractive index; The light refractive index of the preform sandwich layer that adopts in the integer of N≤M≤32, the light refractive index of the preform sandwich layer here and step 1 equates;
To and the covering of M root preform be removed only remaining sandwich layer with the hydrofluorite corroding method;
Above-mentioned M root preform is drawn into the thin rod that radius equates;
Above-mentioned M root preform is processed into the fan-shaped thin rod of M same radius and radian, the radian of each fan-shaped thin rod is α, pi/2 M≤α≤2 π/M again;
With completing steps one and two the thin rod of the circular core that contains annular cladding region organize with M the thin rod of fan-shaped fibre core, put quartz ampoule, the thin quartz pushrod filling that the gap is low but higher than quartz ampoule light refractive index with the fan-shaped thin rod of optics refractive index ratio; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
Claims (3)
1. justify the how fan-shaped doped core optical fiber in periphery, many fan sections of core, this optical fiber comprises fibre core, inner cladding (3) and surrounding layer (4); It is characterized in that:
First to the N fan-shaped rare-earth-doped ion region (11,12 ..., 1N) light refractive index, radius all equate with radian, form a complete circle fibre core; The circular core radius is 2～20 microns;
The integer of 3≤N≤9;
In the inner cladding (3) around circular core evenly distribute same radius and identical radian measure first to the M fan-shaped fibre core (21,22 ..., 2M);
The integer of N≤M≤32;
The first fan-shaped fibre core (21), the second fan-shaped fibre core (22) ..., the radius of the fan-shaped fibre core of M (2M) is 20～200 microns, radian is α, pi/2 M≤α≤2 π/M;
The first fan-shaped fibre core (21), the second fan-shaped fibre core (22) ..., the summit of the fan-shaped fibre core of M (2M) equates that with the distance of the cylindrical of circular core distance is 2～20 microns;
Circular core, first to the M fan-shaped fibre core (21,22 ..., 2M) light refractive index equate that its light refractive index is greater than the light refractive index of inner cladding (3), the light refractive index of inner cladding (3) is greater than the light refractive index of surrounding layer (4).
2. the how fan-shaped doped core optical fiber in periphery, many fan sections of round core according to claim 1 is characterized in that:
First to the N fan-shaped rare-earth-doped ion region (11,12 ..., 1N) rare-earth ion-doped type not identical entirely; Rare-earth ion-doped type comprises that neodymium ion, erbium ion, ytterbium ion, thorium ion, praseodymium ion, holmium ion, samarium ion, neodymium ytterbium mix ion or erbium and ytterbium codoping ion altogether;
First to the M fan-shaped fibre core (21,22 ..., 2M) rare-earth ion-doped type not identical entirely, first to the M fan-shaped fibre core (21,22 ..., 2M) the set of rare-earth ion-doped type and first to the N fan-shaped rare-earth-doped ion region (11,12 ..., 1N) rare-earth ion-doped type set equality.
3. justify the method for making of the how fan-shaped doped core optical fiber in periphery, many fan sections of core, may further comprise the steps:
The circular core that the step 1 making contains annular cladding region is carefully excellent
Select N root sandwich layer radius to equate the rare-earth ion-doped preform that equates with light refractive index; The integer of 3≤N≤9;
The part covering of N root preform is removed, make the thickness of residue covering equate;
The N root preform that will remove the part covering is drawn into the thin rod that the sandwich layer radius equates with cladding thickness;
Above-mentioned N root preform is processed into the fan-shaped thin rod of N same radius and identical radian measure, and the radian of each fan-shaped thin rod is 2 π/N; N fan-shaped thin rod formed a complete circle, and it is carefully excellent to constitute the circular core that contains annular cladding region;
Step 2 is made carefully rod of fan-shaped fibre core
Select M root sandwich layer radius to equate the rare-earth ion-doped preform that equates with light refractive index; The light refractive index of the N root preform sandwich layer that adopts in the integer of N≤M≤32, the light refractive index of the M root preform sandwich layer of selection and step 1 equates;
The covering of M root preform is removed only remaining sandwich layer;
Above-mentioned M root preform is drawn into the thin rod that radius equates;
Above-mentioned M root preform is processed into the fan-shaped thin rod of M same radius and radian, the radian of each fan-shaped thin rod is α, pi/2 M≤α≤2 π/M again;
Step 3 is made into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core
Thin rod of the circular core that contains annular cladding region of completing steps one and M the thin rod of fan-shaped fibre core of step 2 are organized, put quartz ampoule, the gap is low with the fan-shaped thin rod of optics refractive index ratio, but the thin quartz pushrod higher than quartz ampoule light refractive index filled; Be drawn into the how fan-shaped doped core optical fiber in periphery, many fan sections of round core.
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| CN105607183B (en) * | 2016-01-07 | 2019-03-22 | 北京交通大学 | A kind of counter-bending petaloid larger-mode-area single-mode fiber |
| CN106997071A (en) * | 2016-12-21 | 2017-08-01 | 北京交通大学 | A kind of flap optical fiber of large mode field single mode multilayer fibre core |
| CN106842413A (en) * | 2016-12-21 | 2017-06-13 | 北京交通大学 | A kind of flap optical fiber of large mode field single mode multilayer fibre core |
| CN107870389B (en) * | 2017-11-15 | 2019-10-25 | 北京交通大学 | A kind of counter-bending single mode optical fiber of large mode field of parabolic core coupling petaloid core |
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| CN111517637B (en) * | 2020-05-22 | 2021-04-27 | 长飞光纤光缆股份有限公司 | Rare earth doped multi-core optical fiber, optical fiber preform, preparation method and application thereof |
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