CN107500524B - Rare earth doped optical fiber preform and preparation method thereof - Google Patents
Rare earth doped optical fiber preform and preparation method thereof Download PDFInfo
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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
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- 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
- C03B2201/07—Impurity concentration specified
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- 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
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
- C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
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- 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
- C03B2201/32—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with aluminium
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- 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
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- 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
- C03B2203/12—Non-circular or non-elliptical cross-section, e.g. planar core
Abstract
The invention discloses a doped optical fiber preform and a preparation method thereof. The preform comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to outside; the numerical aperture of the second quartz cladding layer relative to the first quartz cladding layer is between 0.1 and 0.24; the cross section of the second quartz cladding layer is circular. It is prepared according to the following method: (1) wrapping the doped core layer with a first quartz cladding material, stretching until the cross-sectional area ratio is matched with that of a second quartz cladding, and processing the cross section of the doped core layer into a preset shape to obtain a preform semi-finished product; (2) and wrapping the semi-finished product of the prefabricated rod by using a second quartz cladding material, and processing the section of the semi-finished product of the prefabricated rod into a circle to obtain the doped optical fiber prefabricated rod. The optical fiber preform provided by the invention is convenient for drawing and forming, meanwhile, the leakage of pump light is greatly reduced, the geometric concentricity of the preform can be ensured by the preparation method, and the consistency among optical fiber production batches is improved.
Description
Technical Field
The invention belongs to the technical field of optical fiber laser, and particularly relates to a rare earth doped optical fiber preform for a laser and a preparation method thereof.
Background
The fiber laser is a laser which utilizes optical fiber as a laser gain medium, and laser output of different wave bands is obtained by doping different rare earth ions in an optical fiber quartz substrate. The optical fiber laser has the advantages of high beam quality, large specific surface area, good heat dissipation, high conversion efficiency, small volume, compact structure, easy maintenance and the like, and is widely applied to the fields of industrial processing, medical treatment, military affairs, communication and the like.
Early single-clad rare earth-doped fibers were used, requiring direct injection of pump light into the core, and when the pump power was gradually increased, it was difficult to further improve the pump light injection efficiency and power with only a few tens of μm core. The method is characterized in that low-refractive-index coating (the refractive index of the coating ranges from 1.3 to 1.4) with a certain thickness is coated outside a traditional optical fiber pure quartz cladding, more multimode pump light is injected into the cladding, and then the pump light is coupled into a doped core layer through total reflection, so that the injection efficiency and power of the pump light are greatly improved. At present, the diameter of the cladding of the double-clad fiber adopting the design scheme, particularly the ytterbium-doped double-clad fiber, reaches 400 mu m, and the single-fiber laser can output several kilowatts, even the kilowatt level. Other rare earth doped optical fibers, such as thulium doped optical fibers, erbium doped optical fibers and other double-clad optical fibers can also achieve the laser output of several kilowatts.
Meanwhile, the double-clad fiber is converted into laser with specific wavelength with better mode and higher power in a rare earth-doped core (the size of the core is 10 mu m or 20 mu m generally) with low NA and small size by injecting multimode pump light into the cladding. To achieve higher laser conversion efficiency, the quartz cladding often has a non-circular cross-section to break the symmetry, so that more pump light is injected into the core and absorbed by the core for conversion into the desired laser output. In the double-clad optical fiber, pure quartz glass is used as an inner cladding, and fluorine-doped acrylic resin coating is used as an outer cladding. Because the fluorine-doped acrylic resin coating has an ultralow refractive index (about 1.3), the pump light injected into the inner cladding is totally reflected at the interface of the inner cladding and the outer cladding. However, the interface is not a complete mirror surface, and part of the pump light can propagate in the fluorine-doped acrylic resin in the form of evanescent waves, so that the low-refractive-index coating can be aged by overhigh temperature, laser radiation and water vapor invasion when long-time laser radiation is carried out. In high power lasers, the burn-in speed will be increased. When the low-refractive-index coating is aged, the absolute refractive index of the low-refractive-index coating can be increased, the adhesion with a glass cladding can be reduced, the conditions of peeling off, microcrack generation and the like can occur at the same time, the gain performance of the optical fiber is influenced, light leakage can occur in serious cases, the optical fiber is burnt, and other devices of the optical fiber laser, including a beam combiner, a pumping source, an isolator and the like, are even damaged.
In addition, the difficulty of drawing an asymmetric optical fiber preform into a satisfactory optical fiber is high, the geometric parameters of the optical fiber are difficult to control under the existing technical conditions, especially, the instability of the control of the wire diameter and the measurement of the drawing tension occurs, the fluctuation of the wire diameter brings the fusion loss of the optical fiber, and the fluctuation of the tension causes the strength of the optical fiber to be poor and the loss to be large.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a rare earth doped optical fiber preform for a laser and a preparation method thereof. The problem of large optical fiber parameter difference caused by the wire drawing diameter and tension fluctuation of the non-circular preform rod is solved by additionally arranging the low-folding quartz cladding with the circular cross section appearance on the irregular quartz cladding, and meanwhile, the leakage of pump light is reduced, and the service life of the optical fiber is prolonged.
To achieve the above objects, according to one aspect of the present invention, there is provided a rare earth-doped optical fiber preform including, from inside to outside, a doped core layer, a first silica clad layer, and a second silica clad layer;
the numerical aperture of the second quartz cladding layer relative to the first quartz cladding layer is between 0.1 and 0.24;
the cross section of the second quartz cladding layer is circular.
Preferably, the rare-earth doped optical fiber preform has a non-circular cross-sectional profile of the first silica clad.
Preferably, the rare-earth doped optical fiber preform has a first silica clad cross-sectional shape of 4D, D type, octagon, hexagon, quincunx, square, or rectangle.
Preferably, the rare-earth doped optical fiber preform has a cross-sectional area ratio of the first quartz clad layer to the doped core layer of 3-1600: 1.
Preferably, the rare-earth doped optical fiber preform has a cross-sectional area ratio of the second silica clad layer to the first silica clad layer of 1: 3-50.
Preferably, the rare-earth doped optical fiber preform has a circular cross-sectional shape of the second silica cladding and is geometrically concentric with the doped fiber core.
Preferably, the second silica cladding of the rare-earth doped optical fiber preform is a fluorine-doped silica layer.
Preferably, the rare earth doped optical fiber preform has a doped core layer with a numerical aperture of 0.06 to 0.25 relative to the first silica clad layer and a doped core layer diameter of 2mm to 6 mm.
According to another aspect of the present invention, there is provided a method for preparing the rare earth-doped optical fiber preform, comprising the steps of:
(1) wrapping the doped core layer with a first quartz cladding material, stretching until the cross-sectional area ratio is matched with that of a second quartz cladding, and processing the cross section of the doped core layer into a preset shape to obtain a preform semi-finished product;
(2) and (2) wrapping the semi-finished product of the prefabricated rod obtained in the step (1) by using a second quartz cladding material, and processing the section of the semi-finished product of the prefabricated rod into a circle to obtain the doped optical fiber prefabricated rod.
Preferably, the preparation method of the rare earth doped optical fiber preform comprises the following steps (2):
and (3) fusing the semi-finished product of the prefabricated rod obtained in the step (1) and a second quartz cladding sleeve tube Rod (RIT) to enable the sleeve tube and the semi-finished product of the prefabricated rod to be solid rods.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the second quartz cladding section of the rare earth doped optical fiber preform rod provided by the invention is circular in shape, is easy to draw and form, and can improve the wire drawing diameter fluctuation of an optical fiber.
Meanwhile, the section of the rare earth doped optical fiber preform is circular, so that the prepared optical fiber section is also circular, the end face cutting success rate of the optical fiber can be improved, and the coupling efficiency of the pump optical fiber (the section of which is in a standard circle shape) and the rare earth doped optical fiber can be improved.
Because the refractive index of the second quartz cladding of the rare earth doped optical fiber preform is low relative to that of the first quartz cladding, the prepared multi-cladding optical fiber can better protect the low-refractive-index coating cladding and prolong the service life of the optical fiber.
According to the preparation method of the rare earth doped optical fiber preform, the non-circular preform semi-finished product is wrapped by the circular second quartz cladding, the RIT collapsing method is adopted in the preferred scheme, the non-circular preform semi-finished product is stably fixed in the circular second quartz cladding sleeve, the concentricity of the optical fiber preform is ensured, and therefore the quality of optical fibers and the consistency among batches are improved.
Drawings
FIG. 1 is a semi-finished solid rod with specification and size drawn by a doped core rod and a first quartz cladding sleeve through RIT drawing process;
FIG. 2 is a doped regular octagonal semi-finished preform from the solid rod of FIG. 1 produced by a milling process;
FIG. 3 is a fluorine-doped clad semifinished solid rod prepared by a regular octagonal semifinished preform and a fluorine-doped clad sleeve through a RIT collapsing process;
FIG. 4 is a graph of the refractive index profiles of a core preform and a glass cladding for a triple-clad rare earth-doped optical fiber and their respective corresponding dimensions;
FIG. 5 is a cross-sectional view of a doped preform after rounding of the fluorine-doped cladding.
Wherein 1 is a doped core layer, 2 is a first quartz cladding layer, and 3 is a second quartz cladding layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The rare earth doped optical fiber preform provided by the invention comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to outside;
the numerical aperture of the doped core layer relative to the first quartz cladding layer is between 0.06 and 0.25, and the diameter of the doped core layer is between 2mm and 6 mm.
The first quartz cladding layer is preferably a pure quartz cladding layer; the cross-sectional profile is non-circular, preferably 4D, D, octagonal, hexagonal, quincunx, square, or rectangular. The cross-sectional area ratio of the first quartz cladding layer to the doped core layer is between 3-1600: 1.
The vertical aperture of the second quartz cladding relative to the first quartz cladding is between 0.1 and 0.24, and the ratio of the vertical aperture to the cross-sectional area of the first quartz cladding is between 1:3 and 50. The second quartz cladding is circular in cross-sectional shape and is geometrically concentric with the doped fiber core. Preferably, the second quartz cladding layer is a fluorine-doped quartz layer.
The rare earth doped optical fiber preform provided by the invention comprises a doped core layer, a pure quartz glass cladding layer and a fluorine-doped glass cladding layer. The core layer is a key part for generating laser, and is used for providing a proper waveguide structure and a gain medium; the two cladding layers are used for coupling pump light into the core layer, the pure quartz cladding layer is non-circular and used for improving coupling efficiency, and the fluorine-doped cladding layer is circular, so that wire drawing control is facilitated, and the organic polymer cladding layer can be protected.
The preparation method of the rare earth doped optical fiber preform comprises the following steps:
(1) wrapping the doped core layer with a first quartz cladding material, stretching until the cross-sectional area ratio is matched with that of a second quartz cladding, and processing the cross section of the doped core layer into a preset shape to obtain a preform semi-finished product;
(2) and (2) wrapping the semi-finished product of the prefabricated rod obtained in the step (1) by using a second quartz cladding material, and processing the section of the semi-finished product of the prefabricated rod into a circle to obtain the doped optical fiber prefabricated rod.
Preferably, a shrinkage sintering method is adopted, and specifically comprises the following steps:
(1) stretching the doped core rod and the first quartz cladding sleeve RIT to match the cross-sectional area ratio with the cross-sectional area ratio of the second quartz cladding, and processing the cross section into a preset shape to obtain a preform semi-finished product;
(2) and (3) fusing the semi-finished product of the prefabricated rod obtained in the step (1) and a second quartz cladding sleeve RIT into a solid rod, and processing the section of the solid rod into a circle to obtain the rare earth doped optical fiber prefabricated rod.
The optical fiber preform provided by the invention is convenient for geometric control of wire drawing diameter and the like, and more importantly, the pump light entering the optical fiber organic coating cladding is effectively reduced, so that the rare earth doped optical fiber efficiency is improved, and the optical fiber is protected. The preparation method can ensure the concentricity of the prefabricated rod, thereby improving the coupling efficiency of the passive optical fiber and the rare earth doped optical fiber.
The following are examples:
example 1
20/350/400 type ytterbium-doped triple-clad optical fiber preform and preparation method thereof
A rare earth doped optical fiber preform comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to outside;
the numerical aperture of the doped core layer relative to the first quartz cladding layer is 0.06, and the radius of the doped core layer is 3.00 mm. The doped component of the fiber core is 1.0 wt% of Yb2O3，3.5％wt P2O5，3.0％wt Al2O3，92.5％wt SiO2。
The first quartz cladding is a pure quartz cladding; the cross section is in the shape of a regular octagon. The ratio of the diameters of the first quartz cladding and doped core (see FIG. 4 a)2：a1) 17.5: 1 (the ratio of the cross-sectional areas of the first quartz cladding layer and the doped core layer was 322: 1).
The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.22, and the ratio of the second quartz cladding to the first quartz cladding is larger (see FIG. 4 a)3：a2) 20: 17.5 (the ratio of the cross-sectional area of the second quartz clad layer to that of the first quartz clad layer is 1: 4.18).
The second quartz cladding is circular in cross-sectional shape and is geometrically concentric with the doped fiber core. The secondThe quartz cladding is a fluorine-doped quartz layer with a composition of 4.3 wt% SiF4，95.7％wt SiO2。
The preform is prepared as follows:
(1) stretching the doped core rod and the first quartz cladding sleeve RIT to match the cross-sectional area ratio with the cross-sectional area ratio of the second quartz cladding, and processing the cross section into a preset shape to obtain a preform semi-finished product; the method specifically comprises the following steps:
the doped core rod with the rod diameter of 18.00mm prepared by MCVD and a pure quartz liner tube RIT with the outer diameter of 60.00mm and the inner diameter of 18.50mm are stretched (the stretching temperature is about 2100 ℃), a solid rod with the outer diameter of 20.00mm is stretched on a stretching tower, the diameter is controlled between 19.50mm and 20.00mm, and the solid rod is ground into a regular octagon preform semi-finished product with the side-to-side distance of 17.50mm according to the size of 20/350/400. During the polishing process, the concentricity of the core layer and the pure quartz cladding layer needs to be controlled within 2%.
Because the size of the liner tube is fixed when the doped preform rod is prepared, the pure quartz cladding of the core rod prepared by MCVD has the problem of insufficient cladding thickness, so that the pure quartz cladding with enough thickness needs to be matched with the doped core rod through a stretching process.
(2) And (2) wrapping the semi-finished product of the prefabricated rod obtained in the step (1) by using a second quartz cladding material, and processing the section of the semi-finished product of the prefabricated rod into a circle to obtain the rare earth doped optical fiber prefabricated rod. The method specifically comprises the following steps:
and (3) carrying out RIT (Rit melt shrinkage) on the prefabricated semi-finished product obtained in the step (2) and a fluorine-doped quartz sleeve to melt and shrink the prefabricated semi-finished product and the fluorine-doped quartz sleeve into a solid rod on a melt shrinkage bed. The fluorine-doped quartz sleeve is formed by depositing silicon tetrafluoride glass with a certain thickness on a pure quartz liner tube by a PCVD (plasma chemical vapor deposition) process, wherein the outer diameter of the PCVD liner tube is 31.00mm, the wall thickness is 2.00mm, and the thickness of a single edge of a deposited fluorine-doped glass layer is about 3.00 mm.
The fused solid rod is similar to an octagonal end face, the solid rod is further polished into a round shape with the outer diameter of 20.00mm by a rounding process, and the concentricity of the fluorine-doped quartz cladding and the doped core layer is ensured to be less than 2%, so that the rare earth-doped optical fiber preform provided by the embodiment is obtained.
Example 2
Ytterbium-doped triple-clad optical fiber preform and preparation method thereof
A rare earth doped optical fiber preform comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to outside;
the numerical aperture of the doped core layer relative to the first quartz cladding layer is 0.2, and the radius of the doped core layer is 6.00 mm. The doped component of the fiber core is 1.0 wt% of Yb2O3，3.5％wt P2O5，6.2％wt Al2O3。
The first quartz cladding is a pure quartz cladding; the cross section of the quartz cladding is a regular hexagon, the radius of the cross section is 7.8mm, and the radius of the first quartz cladding is half of the distance between two parallel opposite sides of the hexagon.
The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.12; the second quartz cladding is a fluorine-doped quartz cladding, and the fluorine-doped quartz cladding is doped with 1.18 percent by mass of fluorine. The inner shape of the section of the second quartz cladding is matched with that of the first quartz cladding; the shape of the doped fiber core is circular and is geometrically concentric with the doped fiber core. The second quartz cladding radius was 9 mm.
The preform is prepared as follows:
(1) wrapping the doped core layer with a first quartz cladding material by a quartz sand spraying process, stretching until the cross-sectional area ratio is matched with that of a second quartz cladding, and processing the cross section of the doped core layer into a regular hexagon with the radius to obtain a semi-finished product of the prefabricated rod;
(2) and (2) wrapping the semi-finished product of the prefabricated rod obtained in the step (1) by using a second quartz cladding material cai through a quartz sand spraying process, and processing the cross section of the semi-finished product of the prefabricated rod into a circle to obtain the doped optical fiber prefabricated rod.
Example 3
Ytterbium-doped triple-clad optical fiber preform and preparation method thereof
A rare earth doped optical fiber preform comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to outside;
the numerical aperture of the doped core layer relative to the first quartz cladding layer is 0.1, and the radius of the doped core layer is 12.00 mm. What is needed isThe core doping component is 1.0 wt% Yb2O3，3.5％wt P2O5，4.1％wt Al2O3。
The first quartz cladding is a pure quartz cladding; the cross section is in the shape of a regular octagon. The radius is 24mm, and the radius of the first quartz cladding layer is half of the distance between two parallel opposite sides of the octagon.
The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.20; the second quartz cladding is a fluorine-doped quartz cladding, and the fluorine-doped quartz cladding is 3.96 percent by mass. The inner shape of the section of the second quartz cladding is matched with that of the first quartz cladding; the shape of the doped fiber core is circular, the doped fiber core and the doped fiber core are geometrically concentric, and the radius of the second quartz cladding is 168 mm.
The preform is prepared as follows:
(1) performing outer gas phase deposition on the doped core layer by adopting a first quartz cladding material, stretching until the cross-sectional area ratio is matched with that of a second quartz cladding, and processing the cross section of the doped core layer into a regular octagon with the radius to obtain a preform semi-finished product;
(2) and (2) wrapping the semi-finished product of the prefabricated rod obtained in the step (1) by using a second quartz cladding material through external meteorological deposition, and processing the section of the semi-finished product of the prefabricated rod into a circle to obtain the doped optical fiber prefabricated rod.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A preparation method of a rare earth doped optical fiber preform is characterized by comprising the following steps:
the rare earth doped optical fiber preform comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to outside;
the cross section of the first quartz cladding is non-circular; the cross section of the first quartz cladding is D-shaped, octagonal, hexagonal, quincunx, square or rectangular;
the numerical aperture of the second quartz cladding layer relative to the first quartz cladding layer is between 0.1 and 0.24;
the cross section of the second quartz cladding is circular;
(1) stretching the doped core rod and the first quartz cladding sleeve RIT to match the cross-sectional area ratio with the cross-sectional area ratio of the second quartz cladding, and processing the cross section into a preset shape to obtain a preform semi-finished product;
(2) and (3) fusing the semi-finished product of the prefabricated rod obtained in the step (1) and a second quartz cladding sleeve RIT into a solid rod, and processing the section of the solid rod into a circle to obtain the rare earth doped optical fiber prefabricated rod.
2. A method for fabricating a rare earth doped optical fiber preform according to claim 1 wherein the ratio of the cross-sectional area of the first silica clad layer to the doped core layer is between 3-1600: 1.
3. A method for fabricating a rare-earth doped optical fiber preform according to claim 1, wherein a cross-sectional area ratio of the second silica clad layer to the first silica clad layer is between 1:3 and 50.
4. A method for fabricating a rare-earth doped optical fiber preform according to claim 1 wherein the second silica cladding has a circular cross-sectional shape and is geometrically concentric with the doped core.
5. A method for fabricating a rare-earth doped optical fiber preform according to claim 1 wherein the second silica clad layer is a fluorine-doped silica layer.
6. A method for fabricating a rare earth-doped optical fiber preform according to claim 1, wherein the numerical aperture of the doped core layer with respect to the first silica clad layer is between 0.06 and 0.25, and the radius of the doped core layer is between 2mm and 6 mm.
7. The method for preparing a rare earth-doped optical fiber preform according to claim 1, wherein the step (2) is specifically:
and (3) fusing the semi-finished product of the prefabricated rod obtained in the step (1) and a second quartz cladding sleeve tube rod, so that the sleeve tube and the semi-finished product of the prefabricated rod are burnt into a solid rod.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657943A (en) * | 2007-08-28 | 2010-02-24 | 株式会社藤仓 | Rare-earth doped core multi-clad fiber, fiber amplifier, and fiber laser |
| CN102298173A (en) * | 2011-08-29 | 2011-12-28 | 武汉安扬激光技术有限责任公司 | Lateral pumped fiber structure and manufacturing method thereof |
| CN104865635A (en) * | 2015-06-01 | 2015-08-26 | 武汉睿芯特种光纤有限责任公司 | Elliptical cladding polarization-maintaining large-mode-area gain fiber |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657943A (en) * | 2007-08-28 | 2010-02-24 | 株式会社藤仓 | Rare-earth doped core multi-clad fiber, fiber amplifier, and fiber laser |
| CN102298173A (en) * | 2011-08-29 | 2011-12-28 | 武汉安扬激光技术有限责任公司 | Lateral pumped fiber structure and manufacturing method thereof |
| CN104865635A (en) * | 2015-06-01 | 2015-08-26 | 武汉睿芯特种光纤有限责任公司 | Elliptical cladding polarization-maintaining large-mode-area gain fiber |
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