CN109143457A - A kind of all solid state optical fiber of large mode field and preparation method thereof - Google Patents
A kind of all solid state optical fiber of large mode field and preparation method thereof Download PDFInfo
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- CN109143457A CN109143457A CN201810886881.XA CN201810886881A CN109143457A CN 109143457 A CN109143457 A CN 109143457A CN 201810886881 A CN201810886881 A CN 201810886881A CN 109143457 A CN109143457 A CN 109143457A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
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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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02347—Longitudinal structures arranged to form a regular periodic lattice, e.g. triangular, square, honeycomb unit cell repeated throughout cladding
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The present invention provides a kind of all solid state optical fiber of large mode field, including active fiber core and covering, the active fiber core is located at the center of optical fiber, several microstructure units are arranged in the covering, these microstructure units are arranged by symmetrical centre of active fiber core, each microstructure unit includes the multilayer refracting layer being distributed from the inside to the outside, and the refractive index of these refracting layers alternately changes in height.The present invention also provides a kind of preparation methods of all solid state optical fiber of large mode field.The refractive index ring structure of microstructure unit of the invention is similar to the double-deck Bragg mirror, basic mode can be limited in the conduction of active fiber core area, by the number, period, size and the refractive index that adjust microstructure unit, it can increase the leakage losses of higher order mode, realize the design of big mode field area single mode optical fiber；Invention increases the dimensions that microstructure unit in covering designs, and increase the controllability to active fiber core conduction mode, and this new design scheme is more conducive to realize the batch controllable preparation of large-mode active optical fiber.
Description
Technical field
The present invention relates to optical fiber technology and laser technology field more particularly to a kind of all solid state optical fiber of large mode field and its preparations
Method.
Background technique
Large-mode active optical fiber is the core component for realizing high-energy ultrafast pulse or continuous laser amplification.Large mode field has
The various nonlinear effects generated during pulse amplifying can be effectively reduced in source optical fiber, effectively promote pulse in amplification process
Energy and peak power.Researcher realizes large mode field optical fiber design using photonic crystal fiber technology at present.In photonic crystal
In optical fiber technology, and there is two major classes technological approaches to realize large mode field optical fiber design, one is use low-refraction in covering
Minute pores array/or fluorine doped glass dot-matrix array, conduct to limit light in fibre core, by reduce covering in micro- stomata/or
The duty ratio of fluorine doped glass stick, to realize that large mode field designs；Another kind is to mix germanite glass stick using high refractive index in covering,
Using photonic band gap effects, to prepare all solid state large mode field optical fiber.However the large mode field optical fiber high-order mode of both technologies preparation
Loss is difficult to improve, and fibre core conduction is uncontrollable.
Summary of the invention
In view of this, all solid state optical fiber of the large mode field can increase the present invention provides a kind of large mode field all solid state optical fiber
The leakage losses of higher order mode realize the design of big mode field area single mode optical fiber；It is simple that the present invention also provides manufacturing process
The preparation method of all solid state optical fiber of large mode field.
The present invention provides a kind of all solid state optical fiber of large mode field, including active fiber core and covering, and the active fiber core is located at light
Fine center arranges several microstructure units in the covering, these microstructure units using active fiber core as symmetrical centre into
Row arrangement, each microstructure unit include the multilayer refracting layer being distributed from the inside to the outside, and the refractive index of these refracting layers is handed in height
For variation.
Further, the microstructure unit successively includes light fuse and glass of high refractive index from the inside to the outside
Ring, the light fuse are located at the center of microstructure unit, and the glass of high refractive index ring surrounds low-refraction glass
Glass fuse.
Further, the microstructure unit further includes light ring, and the light ring is around height
Refractive index glass ring.
Further, the glass of high refractive index ring and light collar are wound on the outside of light fuse
It is alternately circumferentially distributed.
Further, the light fuse is by fluorine doped glass or non-impurity-doped glass preparation, the low-refraction
The refractive index of glass fuse is less than the refractive index of glass of high refractive index ring adjacent thereto.
Further, the glass of high refractive index ring is prepared by mixing germanite glass or pure quartz glass, each high refractive index
The refractive index of glass ring is all larger than the refractive index of light ring adjacent thereto.
Further, the light ring is by fluorine doped glass or non-impurity-doped glass preparation, each low-refraction
The refractive index of glass ring is respectively less than the refractive index of glass of high refractive index ring adjacent thereto.
Further, the microstructure unit is equidistantly arranged using active fiber core as symmetrical centre, the microstructure unit
Between line form regular polygon, the active fiber core is located at the center of regular polygon, and the microstructure unit can be single layer
Or multilayer arrangement.
Further, the covering surrounds active fiber core, and the refractive index of the active fiber core is greater than, is less than or equal to covering
Effective refractive index, the active fiber core doping with rare-earth ions, the rare earth ion be neodymium ion, ytterbium ion, erbium ion, thulium from
Any one of son, holmium ion, dysprosium ion, praseodymium ion.
The present invention also provides a kind of preparation methods of above-mentioned all solid state optical fiber of large mode field, comprising the following steps:
S1 prepares the prefabricated rods of microstructure unit and the prefabricated rods of doping with rare-earth ions using chemical vapour deposition technique；
The prefabricated rods of microstructure unit are carried out polishing or corrosion treatment by S2；
The prefabricated rods of microstructure unit and the prefabricated rods of doping with rare-earth ions are carried out wire drawing on fiber drawing tower by S3；
The prefabricated rods of microstructure unit after wire drawing and the prefabricated rods of doping with rare-earth ions are carried out heap using stacking by S4
Product, then all solid state optical fiber of large mode field is drawn on fiber drawing tower.
Technical solution provided by the invention has the benefit that compared with prior art the present invention is easy to implement entirely
The large mode field optical fiber of solid, the present invention introduce height in microstructure unit and reflect by using completely new blanket design scheme
Rate variation, the refractive index ring structure of microstructure unit of the invention are similar to the double-deck Bragg mirror, can limit basic mode
It is conducted in active fiber core area, by adjusting number, period, size and the refractive index of microstructure unit, can increase higher order mode
Leakage losses realize the design of big mode field area single mode optical fiber；Invention increases in covering microstructure unit design dimension,
The controllability to active fiber core conduction mode is increased, this new design scheme is more conducive to realize batch of large-mode active optical fiber
Measure controllable preparation, and the application range of further expansion the type optical fiber.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of all solid state optical fiber of large mode field of the present invention.
Fig. 2 is the structural schematic diagram of the microstructure unit of the embodiment of the present invention 1.
Fig. 3 is the structural schematic diagram of the microstructure unit of the embodiment of the present invention 2.
Fig. 4 is the structural schematic diagram of the microstructure unit of the embodiment of the present invention 3.
Fig. 5 is the structural schematic diagram that microstructure unit of the present invention is arranged according to regular heptagon.
Fig. 6 is the structural schematic diagram that microstructure unit of the present invention is arranged according to regular hexagon.
Fig. 7 is a kind of flow diagram of the preparation method of all solid state optical fiber of large mode field of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Fig. 1 and Fig. 2 are please referred to, the embodiment provides a kind of all solid state optical fiber of large mode field, including active fiber core 1
With covering 2, active fiber core 1 is located at the center of optical fiber, and covering 2 is centered around around active fiber core 1, the refractive index of active fiber core 1
It is greater than, less than or equal to the effective refractive index of covering 2, arranges several microstructure units 21, each microstructure unit in covering 2
21 include the multilayer refracting layer being distributed from the inside to the outside, and the refractive index of these refracting layers alternately changes in height, these micro-structure lists
Member 21 is that symmetrical centre equidistantly arranges, and the line between these microstructure units 21 forms regular polygon with active fiber core 1,
Active fiber core 1 is located at the center of regular polygon, and then is limited the basic mode transmitted in active fiber core 1 by these microstructure units 21
It makes in active fiber core 1, the period of microstructure unit 21 and size can be carried out adjustment, by adjusting the period of microstructure unit 21
It can increase the leakage losses that higher order mode is transmitted in optical fiber with size, covering 2 further includes pumping covering 22, pumps covering 22 by low
Refractive index coating material, air cladding layer or non-circular fluorine doped glass ring are constituted.
It is the structural schematic diagram of the microstructure unit 21 of the embodiment of the present invention 1, in the embodiment of the present invention 1 with reference to Fig. 2
In, microstructure unit 21 successively includes light fuse 211 and glass of high refractive index ring 212, low refraction from the inside to the outside
Rate glass fuse 211 is located at the center of microstructure unit 21, and glass of high refractive index ring 212 is centered around light fuse
Around 211, the refractive index that the refractive index of light fuse 211 is less than glass of high refractive index ring 212 makes micro-structure
Refractive index changes in height in unit 21.
It is the structural schematic diagram of the microstructure unit 21 of the embodiment of the present invention 2, in the embodiment of the present invention 2 with reference to Fig. 3
In, microstructure unit 21 successively includes light fuse 211, glass of high refractive index ring 212 and low refraction from the inside to the outside
Rate glass ring 213, light fuse 211 are located at the center of microstructure unit 21, and glass of high refractive index ring 212 is centered around
Around light fuse 211, light ring 213 is centered around around glass of high refractive index ring 212, low folding
The refractive index for penetrating rate glass fuse 211 is less than the refractive index of glass of high refractive index ring 212, the refraction of glass of high refractive index ring 212
Rate is greater than the refractive index of light ring 213, so that refractive index alternately changes in height in microstructure unit 21.
It is the structural schematic diagram of the microstructure unit 21 of the embodiment of the present invention 3, in the embodiment of the present invention 3 with reference to Fig. 4
In, microstructure unit 21 successively includes light fuse 211, glass of high refractive index ring 212, low-refraction from the inside to the outside
Glass ring 213 and another glass of high refractive index ring 212, light fuse 211 are located at the center of microstructure unit 21,
Glass of high refractive index ring 212 is centered around around light fuse 211, and light ring 213 is centered around high folding
It penetrates around rate glass ring 212, another glass of high refractive index ring 212 surrounds light ring 213, light
The refractive index of fuse 211 is less than the refractive index of glass of high refractive index ring 212, and the refractive index of glass of high refractive index ring 212 is greater than low
The refractive index of the refractive index of refractive index glass ring 213, light ring 213 is less than another glass of high refractive index ring 212
Refractive index so that in microstructure unit 21 refractive index in height alternately change.
In above-described embodiment 1 into embodiment 3, light fuse 211 is by fluorine doped glass or non-impurity-doped glass system
Standby, glass of high refractive index ring 212 is prepared by mixing germanite glass or pure quartz glass, light ring 213 by fluorine doped glass or
Non-impurity-doped glass preparation.
On the basis of above-described embodiment 1 to embodiment 3, glass of high refractive index ring 212 and light ring 213 enclose
It is wound on alternately circumferentially distributed on the outside of light fuse 211, the refractive index of the glass of high refractive index ring 212 repeated can
With it is identical with the refractive index (from inside to outside) of the glass of high refractive index ring 212 first appeared, can also be different；That repeats is low
The refractive index of refractive index glass ring 213 can be with refractive index (from inside to outside) phase of the light ring 213 first appeared
Together, it can also be different.The outermost layer of microstructure unit 21 can be glass of high refractive index ring 212 or light ring 213,
The refractive index of each glass of high refractive index ring 212 is all larger than the refractive index of light ring 213 adjacent thereto, each
The refractive index of a light ring 213 is respectively less than the refractive index of glass of high refractive index ring 212 adjacent thereto, with low refraction
The refractive index of the adjacent glass of high refractive index ring 212 of rate glass fuse 211 is greater than the refractive index of light fuse 211.
1 doping with rare-earth ions of active fiber core for all solid state optical fiber of large mode field that the embodiment of the present invention provides, rare earth ion
For any one of neodymium ion, ytterbium ion, erbium ion, thulium ion, holmium ion, dysprosium ion, praseodymium ion.
The embodiment of the present invention 1 does not limit the size of microstructure unit 21 with refractive index variable quantity into embodiment 3
It is fixed, specific design can be carried out according to core mode characteristic in large-mode active optical fiber and doping with rare-earth ions and calculated to obtain most
Excellent design.
The embodiment of the present invention provide all solid state optical fiber of large mode field these microstructure units 21 according to regular polygon into
When row arrangement, regular polygon is equilateral triangle, can also be regular pentagon, regular hexagon, regular heptagon, octagon, positive nine side
Shape or regualr decagon, when microstructure unit 21 is according to regular pentagon, regular heptagon, octagon, positive nonagon or regualr decagon
It is monolayer alignment when arrangement, Fig. 1 is the schematic diagram that microstructure unit 21 is arranged according to regular pentagon, and Fig. 5 is microstructure unit 21
The schematic diagram arranged according to regular heptagon；It is monolayer alignment or the double-deck row when microstructure unit 21 is arranged according to regular hexagon
Column, with reference to Fig. 6, when microstructure unit 21 is dual layer arrangement, the first layer microstructure unit 21 close to active fiber core 1 is according to positive six
Side shape is arranged, and the second layer microstructure unit 21 far from active fiber core 1 is arranged in first layer micro-structure according to regular hexagon
The outside of unit 21, the quantity of microstructure unit 21 is micro- knot in first layer microstructure unit 21 in second layer microstructure unit 21
Twice of the quantity of structure unit 21.
With reference to Fig. 7, the embodiments of the present invention also provide the preparation method of all solid state optical fiber of above-mentioned large mode field, including it is following
Step:
Step S1 prepares using chemical vapour deposition technique the prefabricated rods and doping with rare-earth ions of microstructure unit 21 respectively
Prefabricated rods, wherein the index distribution of the prefabricated rods of microstructure unit 21 is according to the alternately rule design preparation of high low-refraction；
The prefabricated rods of microstructure unit 21 are carried out polishing or corrosion treatment appropriate by step S2, suitable outer to obtain
Diameter size；
Step S3, on fiber drawing tower by the prefabricated stick drawn wire of microstructure unit 21 to diameter be 1mm-10mm, will mix
The prefabricated stick drawn wire of miscellaneous rare earth ion to diameter is 1mm-10mm；
Step S4, using stacking by the prefabricated rods of the prefabricated rods of the microstructure unit 21 after wire drawing and doping with rare-earth ions
It is accumulated, the prefabricated rods of microstructure unit 21 are carried out according to regular polygon by symmetrical centre of the prefabricated rods of doping with rare-earth ions
Equidistant arrangement, then the preform for folding heap on fiber drawing tower is at all solid state optical fiber of large mode field.
Compared with prior art, the present invention is easy to implement the large mode field optical fiber of total solids, and the present invention is by using completely new
Blanket design scheme introduces height variations in refractive index, the refractive index of microstructure unit 21 of the invention in microstructure unit 21
Ring structure is similar to the double-deck Bragg mirror, basic mode can be limited in the conduction of 1st area of active fiber core, by adjusting micro-structure list
Number, period, size and the refractive index of member 21 can increase the leakage losses of higher order mode, realize big mode field area single mode optical fiber
Design；Invention increases the dimensions that microstructure unit 21 in covering 2 designs, and increase to 1 conduction mode of active fiber core
Controllability, this new design scheme is more conducive to realize the batch controllable preparation of large-mode active optical fiber, and further expansion should
The application range of type fiber.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of all solid state optical fiber of large mode field, including active fiber core and covering, the active fiber core is located at the center of optical fiber, special
Sign is, several microstructure units are arranged in the covering, these microstructure units are carried out by symmetrical centre of active fiber core
Arrangement, each microstructure unit include the multilayer refracting layer being distributed from the inside to the outside, and the refractive index of these refracting layers is in height alternating
Variation.
2. all solid state optical fiber of large mode field as described in claim 1, which is characterized in that the microstructure unit is from the inside to the outside successively
Including light fuse and glass of high refractive index ring, the light fuse is located in microstructure unit
The heart, the glass of high refractive index ring surround light fuse.
3. all solid state optical fiber of large mode field as claimed in claim 2, which is characterized in that the microstructure unit further includes low refraction
Rate glass ring, the light ring surround glass of high refractive index ring.
4. all solid state optical fiber of large mode field as claimed in claim 3, which is characterized in that the glass of high refractive index ring and low refraction
Rate glass ring is centered around alternately circumferentially distributed on the outside of light fuse.
5. all solid state optical fiber of large mode field as claimed in claim 4, which is characterized in that the light fuse is by fluorine doped
The refractive index of glass or non-impurity-doped glass preparation, the light fuse is less than glass of high refractive index ring adjacent thereto
Refractive index.
6. all solid state optical fiber of large mode field as claimed in claim 4, which is characterized in that the glass of high refractive index ring is by mixing germanium glass
Glass or pure quartz glass preparation, the refractive index of each glass of high refractive index ring are all larger than light ring adjacent thereto
Refractive index.
7. all solid state optical fiber of large mode field as claimed in claim 4, which is characterized in that the light ring is by fluorine doped glass
Glass or non-impurity-doped glass preparation, the refractive index of each light ring are respectively less than glass of high refractive index ring adjacent thereto
Refractive index.
8. all solid state optical fiber of large mode field as described in claim 1, which is characterized in that the microstructure unit is with active fiber core
Symmetrical centre equidistantly arranges, and the line between the microstructure unit forms regular polygon, and the active fiber core is located at just more
The center of side shape, the microstructure unit can arrange for single-layer or multi-layer.
9. all solid state optical fiber of large mode field as described in claim 1, which is characterized in that the covering surrounds active fiber core, described
The refractive index of active fiber core is greater than, less than or equal to the effective refractive index of covering, and the active fiber core doping with rare-earth ions is described
Rare earth ion is any one of neodymium ion, ytterbium ion, erbium ion, thulium ion, holmium ion, dysprosium ion, praseodymium ion.
10. a kind of preparation method of all solid state optical fiber of described in any item large mode fields of claim 1 to 9, which is characterized in that including
Following steps:
S1 prepares the prefabricated rods of microstructure unit and the prefabricated rods of doping with rare-earth ions using chemical vapour deposition technique；
The prefabricated rods of microstructure unit are carried out polishing or corrosion treatment by S2；
The prefabricated rods of microstructure unit and the prefabricated rods of doping with rare-earth ions are carried out wire drawing on fiber drawing tower by S3；
S4 is accumulated the prefabricated rods of the prefabricated rods of the microstructure unit after wire drawing and doping with rare-earth ions using stacking,
The all solid state optical fiber of large mode field is drawn on fiber drawing tower again.
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| CN201810886881.XA CN109143457B (en) | 2018-08-06 | 2018-08-06 | Large-mode-field all-solid-state optical fiber and preparation method thereof |
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| CN201810886881.XA CN109143457B (en) | 2018-08-06 | 2018-08-06 | Large-mode-field all-solid-state optical fiber and preparation method thereof |
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| CN111484242A (en) * | 2020-05-22 | 2020-08-04 | 长飞光纤光缆股份有限公司 | Bragg optical fiber preform, Bragg optical fiber, preparation method and application thereof |
| WO2024025459A1 (en) * | 2022-07-28 | 2024-02-01 | Nanyang Technological University | Optical fiber and method of forming the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109143457B (en) | 2020-02-11 |
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