CN101694534A - Single-core multiple rare-earth-doped ion region double-clad optical fiber and manufacturing method thereof - Google Patents

Single-core multiple rare-earth-doped ion region double-clad optical fiber and manufacturing method thereof Download PDF

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CN101694534A
CN101694534A CN 200910236162 CN200910236162A CN101694534A CN 101694534 A CN101694534 A CN 101694534A CN 200910236162 CN200910236162 CN 200910236162 CN 200910236162 A CN200910236162 A CN 200910236162A CN 101694534 A CN101694534 A CN 101694534A
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earth
rare
optical fiber
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CN101694534B (en
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胡旭东
宁提纲
裴丽
李晶
周倩
魏淮
祁春慧
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Beijing Jiaotong University
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/01228—Removal of preform material
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C03B2201/34—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/23—Double or multiple optical cladding profiles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/29—Segmented core fibres

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Lasers (AREA)

Abstract

A single-core multiple rare-earth-doped ion region double-clad optical fiber and a manufacturing method thereof belong to the field of high-power wide band optical fiber amplifiers, lasers and special optical fibers and can amplify signals in O, E, S, C, L, U/XL wave ranges simultaneously. The single-core structure of the double-clad optical fiber is easy to be welded with a common optical fiber directly, the core layer of the double-clad optical fiber comprises N independent different rare-earth-doped ion regions, wherein N is larger than or equal to 2 and smaller than or equal to 20. The manufacture method includes: step 1, drawing N prefabricated rods of the rare-earth-doped ion double-clad optical fiber into thin rods with identical core layer diameters and removing outer clad layers of the thin rods, wherein 2<=N=<20; step 2, processing the N thin rods of which the outer clad layers are removed so as to enable the core layers of the thin rods to form sectors; and step 3, arraying the processed N thin rods, coating a quartz tube on the same, and then drawing to form the single-core multiple rare-earth-doped ion region double-clad optical fiber. As the optical prefabricated rods are utilized to manufacture the single-core multiple doped optical fiber, manufacturing process thereof is simplified, and the optical fiber is compact in structure and low in environmental affection.

Description

Single-core multiple rare-earth-doped ion region double-clad optical fiber and preparation method thereof
Technical field
The present invention relates to single-core multiple rare-earth-doped ion region double-clad optical fiber 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 rare earth element 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, mixes the rare earth ion of different glass matrixs, and 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 andelectronic properties of rare-earth ions in glasses in rare-earth doped fiber lasers andamplifier.NewYork:Marcel Dekker.2001, pp:17-112].Existing doubly clad optical fiber or for singly mixing rare earth perhaps is double rare-earth-mixed.Even double rare-earth-mixed optical fiber, also be to utilize the absorption cross section difference of two kinds of doped rare earth elements to pumping source, and two kinds of element energy levels interactions that distance is very near, realize a kind of doped rare earth element absorptive pumping power, the purpose that another kind of element is excited to amplify is as erbium-ytterbium co-doped fiber.Therefore, existing doubly clad optical fiber amplifying signal bandwidth has only tens nm usually, and when will amplifying different wavelength signals, 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.
Summary of the invention
Can only amplify very narrow wavelength coverage in order to overcome existing traditional double cladded-fiber, the invention provides a kind of single-core multiple rare-earth-doped ion region double-clad optical fiber and preparation method thereof.
The objective of the invention is to be achieved through the following technical solutions:
Single-core multiple rare-earth-doped ion region double-clad optical fiber, its sandwich layer comprise N independent rare-earth-doped ion region, and the integer of 2≤N≤20 wherein has the rare-earth ion-doped type difference in two districts at least in this N rare-earth-doped ion region.
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.
The method for making of single-core multiple rare-earth-doped ion region double-clad optical fiber may further comprise the steps:
Step 1 is drawn into the thin rod of sandwich layer equal diameters with the prefabricated rods of the rare-earth ion-doped doubly clad optical fiber of N root, and surrounding layers of these thin rods are removed the integer of 2≤N≤20;
Step 2 is handled the thin rod of N root that removes surrounding layer, makes the sandwich layer of thin rod become fan-shaped;
Step 3 is organized the thin rod of N root after handling, and puts quartz ampoule, is drawn into single-core multiple rare-earth-doped ion region double-clad optical fiber.
According to the single-core fiber that above-mentioned steps is made, has the rare-earth ion-doped type difference of the prefabricated rods of two doubly clad optical fibers at least.
The rare-earth ion-doped type of the prefabricated rods of doubly clad optical fiber 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 in the step 1.
Beneficial effect of the present invention is specific as follows: single-core multiple rare-earth-doped ion region double-clad optical fiber, scalable wavelength comprises O, E, S from 400nm to 2900nm wide region, C, L, the signal of U/XL wave band.Amplify in the multi-wave signal with respect to tradition, need carry out signal again to the doubly clad optical fiber that each wave band disposes corresponding rare-earth ion-doped type respectively merges, obviously, adopt multiple rare-earth-doped ion multicore doubly clad optical fiber obviously to reduce junction loss, structure is compact more.The sandwich layer of doubly clad optical fiber is divided into different sector regions according to rare-earth-ion-doped difference, make each rare-earth ion-doped on the one hand because the feasible bigger gain of shared inner cladding, on the other hand, because the light signal output area that amplifies is different, provide convenience to relevant signal Processing.Adopt single cored structure, make this optical fiber easily and the direct welding of ordinary optic fibre.Owing to adopt many rare-earth ion-doped complete identical doubly clad optical fiber prefabricated rods to make single-core multiple rare-earth-doped ion region optical fiber, simplified manufacture craft, compact conformation, advantage such as little affected by environment.
Description of drawings
Fig. 1 is four rare-earth-doped ion region double-clad optical fiber sectional views of single core.
Fig. 2 is two rare-earth-doped ion region double-clad optical fiber sectional views of single core.
Fig. 3 is ten rare-earth-doped ion region double-clad optical fiber sectional views of single core.
Fig. 4 is 20 rare-earth-doped ion region double-clad optical fiber sectional views of single core.
Fig. 5 is the sectional view of the sandwich layer rare-earth-doped ion region of Fig. 4.
Embodiment
The present invention does not relate to the making of rare-earth ion-doped fiber core double-cladding preform, and these are the technology of patent or bibliographical information.
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
Single-core multiple rare-earth-doped ion region double-clad optical fiber, its sandwich layer comprise independently the Nd ion doped district, mix holmium ion district, er-doped ion district and mix the ytterbium ion district, referring to Fig. 1.
The method for making of four rare-earth-doped ion region double-clad optical fibers of above-mentioned single core is described in detail as follows:
Step 1 is made four of rare-earth ion-doped doubly clad optical fiber prefabricated rods, four rare-earth ion-doped neodymium ion, holmium ion, erbium ion and ytterbium ions of being respectively of preform, and the shape of four preform inner claddings is round rectangle; This different rare-earth ion-doped doubly clad optical fiber prefabricated rods of four is drawn into round rectangle (the thin rod of 200 * 160mm) inner claddings that the sandwich layer diameter is 10mm.
Step 2 erodes the surrounding layer that above-mentioned four sandwich layer diameters are the thin rod of 10mm with hydrofluorite, stays inner cladding and sandwich layer is two-layer.
Step 3 is carried out cut to four thin rods that remove surrounding layer, and making every thin excellent sandwich layer be radian is the fan-shaped of pi/2.
Step 4 is organized four thin rods after the step 3 processing, puts the quartz ampoule that internal diameter is 200mm.
Step 5, with the thin excellent wire drawing of completing steps four, being drawn into the sandwich layer diameter is four rare-earth-doped ion region double-clad optical fibers of single core of 1 μ m.Wherein inner cladding 2 be shaped as round rectangle, surrounding layer 1 be shaped as circle, divide into four zones in the sandwich layer: Nd ion doped zone 3, mix holmium ion zone 4, er-doped ion zone 5 and mix ytterbium ion zone 6, as shown in Figure 1.
Embodiment two
Single-core multiple rare-earth-doped ion region double-clad optical fiber, its sandwich layer comprise independently mix the holmium ion district, the ytterbium erbium is mixed the ion district altogether, referring to Fig. 2.
The method for making of two rare-earth-doped ion region double-clad optical fibers of above-mentioned a kind of single core is described in detail as follows:
Step 1 is made two of rare-earth ion-doped doubly clad optical fiber prefabricated rods, two rare-earth ion-doped holmium ion, erbium and ytterbium codoping ions of being respectively of preform, and the shape of the inner cladding of two prefabricated rods is circle; The rare-earth ion-doped doubly clad optical fiber prefabricated rods of these two differences is drawn into the sandwich layer diameter is 5mm, the inner cladding diameter is the thin rod of 150mm.
Step 2 is removed with the way of the cut surrounding layers with above-mentioned two thin rods, stays inner cladding and sandwich layer is two-layer.
Step 3 is carried out milled processed to the thin rod that removes surrounding layer, makes the thin excellent sandwich layer of erbium and ytterbium codoping and inner cladding be the fan-shaped of 2 π/3 radians, and thin excellent sandwich layer and the inner cladding of mixing holmium ion are the fan-shaped of π/3 radians.
Step 4 is organized two thin rods after the step 3 processing, puts the quartz ampoule that internal diameter is 150mm.
Step 5, with the excellent wire drawing of completing steps four, being drawn into the sandwich layer diameter is two rare-earth-doped ion region double-clad optical fibers of single core of 8 μ m.Wherein inner cladding 2 be shaped as circle, surrounding layer 1 be shaped as circle, be divided into two zones in the sandwich layer: the erbium ytterbium ion is mixed zone 7 altogether and is mixed holmium ion zone 8, as shown in Figure 2.
Embodiment three
Single-core multiple rare-earth-doped ion region double-clad optical fiber, its sandwich layer comprises that independently Nd ion doped district, holmium ion district, erbium ion district, ytterbium ion district, erbium and ytterbium codoping ion district, neodymium ytterbium are mixed ion district, erbium ion district, ytterbium ion district, erbium and ytterbium codoping ion district, erbium ion district altogether, referring to Fig. 3.
The method for making of ten rare-earth-doped ion region double-clad optical fibers of above-mentioned single core is described in detail as follows:
Step 1, make ten of rare-earth ion-doped doubly clad optical fiber prefabricated rods, ten preforms are rare-earth ion-doped to be respectively neodymium ion, holmium ion, erbium ion, ytterbium ion, erbium and ytterbium codoping ion, neodymium ytterbium and to mix ion, erbium ion, ytterbium ion, erbium and ytterbium codoping ion, erbium ion altogether, and the shape of the inner cladding of ten prefabricated rods is octagon; These ten rare-earth ion-doped doubly clad optical fiber prefabricated rods are drawn into the sandwich layer diameter are 1mm, the inner cladding diameter is the thin rod of 40mm;
Step 2 is removed above-mentioned ten thin excellent surrounding layers with the way of grinding, and stays inner cladding and sandwich layer is two-layer;
Step 3 is carried out the hydrofluorite corrosion treatment to the thin rod that removes surrounding layer, makes every thin excellent sandwich layer and inner cladding be the fan-shaped of π/5 radians;
Step 4 is organized ten thin rods after the step 3 processing, puts the quartz ampoule that internal diameter is 40mm;
Step 5, with the excellent wire drawing of completing steps four, being drawn into the sandwich layer diameter is ten rare-earth-doped ion region double-clad optical fibers of single core of 10 μ m.Wherein inner cladding 2 is shaped as anistree rectangle, surrounding layer 1 be shaped as circle, be divided into ten zones in the sandwich layer: neodymium ion zone 9, holmium ion zone 10, erbium ion zone 11,15 and 18, ytterbium ion zone 12 and 16, erbium and ytterbium codoping ion zone 13 and 17, neodymium ytterbium are mixed ion zone 14 altogether, as shown in Figure 3.
Embodiment four
Single-core multiple rare-earth-doped ion region double-clad optical fiber, its sandwich layer comprises independently the Nd ion doped district, mixes holmium ion district, er-doped ion district, mixes the ytterbium ion district, the ion district is mixed in erbium and ytterbium codoping ion district, neodymium ytterbium altogether, mix the samarium ion district, mix the thorium ion district, mix the praseodymium ion district, er-doped ion district, mix ytterbium ion district, erbium and ytterbium codoping ion district, mix the ytterbium ion district, erbium and ytterbium codoping ion district, mix the thorium ion district, mix the praseodymium ion district, erbium and ytterbium codoping ion district, neodymium ytterbium mix ion district, Nd ion doped district altogether, mix the holmium ion district, referring to Fig. 4 and Fig. 5.
The method for making of above-mentioned single core 20 rare-earth-doped ion region double-clad optical fibers is described in detail as follows:
Step 1, make 20 of rare-earth ion-doped doubly clad optical fiber prefabricated rods, 20 preform sandwich layers are rare-earth ion-doped to be respectively neodymium ion, holmium ion, erbium ion, ytterbium ion, erbium and ytterbium codoping ion, neodymium ytterbium and to 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, neodymium ion, holmium ion altogether; The shape of the inner cladding of 20 prefabricated rods is circle; These 20 rare-earth ion-doped doubly clad optical fiber prefabricated rods are drawn into the sandwich layer diameter are 2mm, the inner cladding diameter is the thin rod of 80mm;
Step 2 is removed above-mentioned 20 thin excellent surrounding layers with the way of grinding, and stays inner cladding and sandwich layer is two-layer;
Step 3 is carried out machine cuts to the thin rod that removes surrounding layer and is handled, and makes every thin excellent sandwich layer and inner cladding be the fan-shaped of π/10 radians;
Step 4 is organized 20 thin rods after the step 3 processing, puts the quartz ampoule that internal diameter is 80mm;
Step 5, with the excellent wire drawing of completing steps four, being drawn into the sandwich layer diameter is 20 rare-earth-doped ion region double-clad optical fibers of single core of 20 μ m.As shown in Figure 4, inner cladding 2 be shaped as circle, surrounding layer 1 be shaped as circle.Fig. 5 is that the amplification of Fig. 4 center core layer 100 shows, be divided into 20 zones in the sandwich layer 100: neodymium ion zone 19 and 37, holmium ion zone 20 and 38, erbium ion zone 21 and 28, ytterbium ion zone 22,29 and 31, erbium and ytterbium codoping ion zone 23,30,32 and 35, neodymium ytterbium are mixed ion zone 24 and 36, samarium ion zone 25, thorium ion zone 26 and 33, praseodymium ion zone 27 and 34 altogether
Embodiment five
Single-core multiple rare-earth-doped ion region double-clad optical fiber, its sandwich layer comprise N independent rare-earth-doped ion region, and the integer of 2≤N≤20 wherein has the rare-earth ion-doped type difference in two districts at least in this N rare-earth-doped ion region.
The method for making of above-mentioned single-core multiple rare-earth-doped ion region double-clad optical fiber:
Step 1, make rare-earth ion-doped doubly clad optical fiber prefabricated rods N root, N is the integer between 2 to 20, N root preform sandwich layer is rare-earth ion-doped not identical entirely, inner cladding is shaped as arbitrary shape, rare-earth ion-doped doubly clad optical fiber prefabricated rods is drawn into the thin rod of sandwich layer equal diameters, and thin excellent sandwich layer diameter is 1～10mm;
Step 2 is removed above-mentioned 20 thin excellent surrounding layers with the way of grinding or cut or machine cuts or hydrofluorite corrosion, stays inner cladding and sandwich layer is two-layer;
Step 3, the thin rod that removes surrounding layer is ground or cut or machine cuts or hydrofluorite corrosion treatment, make that the sandwich layer of thin rod is fan-shaped;
Step 4, the thin rod after will handling are organized, and put quartz ampoule;
Step 5, with the excellent wire drawing of completing steps four, being drawn into the sandwich layer diameter is 20 rare-earth-doped ion region double-clad optical fibers of single core of 1～20 μ m.

Claims (4)

1. single-core multiple rare-earth-doped ion region double-clad optical fiber is characterized by: sandwich layer comprises N independent rare-earth-doped ion region, and the integer of 2≤N≤20 wherein has the rare-earth ion-doped type difference in two districts at least in this N rare-earth-doped ion region.
2. single-core multiple rare-earth-doped ion region double-clad optical fiber according to claim 1 is characterized by: 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.
3. the method for making of single-core multiple rare-earth-doped ion region double-clad optical fiber is characterized by: may further comprise the steps:
Step 1 is drawn into the thin rod of sandwich layer equal diameters with the prefabricated rods of the rare-earth ion-doped doubly clad optical fiber of N root, and surrounding layers of these thin rods are removed the integer of 2≤N≤20;
Step 2 is handled the thin rod of N root that removes surrounding layer, makes the sandwich layer of thin rod become fan-shaped;
Step 3 is organized the thin rod of N root after handling, and puts quartz ampoule, is drawn into single-core multiple rare-earth-doped ion region double-clad optical fiber.
4. the method for making of single-core multiple rare-earth-doped ion region double-clad optical fiber according to claim 3, it is characterized by: have the rare-earth ion-doped type difference of two prefabricated rods in the prefabricated rods of rare-earth ion-doped doubly clad optical fiber at least, the rare-earth ion-doped type of prefabricated rods 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.
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CN102116902A (en) * 2011-03-15 2011-07-06 武汉锐科光纤激光器技术有限责任公司 Optic fiber power beam combiner and preparation method thereof
CN102262263A (en) * 2011-09-01 2011-11-30 北京交通大学 Optical fibre with multiple-sector fiber core at periphery of multiple-sector area of circular fiber core, and fabrication method thereof
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
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CN108333673A (en) * 2018-01-04 2018-07-27 南京邮电大学 A kind of heterogeneous fragmented packets layer large mould field single mode optical fiber
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CN108333672B (en) * 2018-01-04 2020-01-17 南京邮电大学 Large-mode-field single-mode fiber with heterogeneous spiral cladding structure
CN109143464A (en) * 2018-11-29 2019-01-04 中聚科技股份有限公司 A kind of rear-earth-doped glass optical fiber and preparation method thereof
CN109143464B (en) * 2018-11-29 2019-03-12 中聚科技股份有限公司 A kind of rear-earth-doped glass optical fiber and preparation method thereof
CN114180835A (en) * 2021-11-08 2022-03-15 宁波大学 Rare earth doped glass with ultra-wideband near-infrared fluorescence emission and preparation method and application thereof

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