CN103439763B - A kind of total solid optical fiber with large-mode field area and manufacture method thereof - Google Patents
A kind of total solid optical fiber with large-mode field area and manufacture method thereof Download PDFInfo
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- CN103439763B CN103439763B CN201310419622.3A CN201310419622A CN103439763B CN 103439763 B CN103439763 B CN 103439763B CN 201310419622 A CN201310419622 A CN 201310419622A CN 103439763 B CN103439763 B CN 103439763B
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Abstract
The present invention relates to a kind of total solid optical fiber with large-mode field area, comprise core district and clad region, core district is made up of the quartz glass mixing fluorine, mixes Funing tablet and meets: 0≤(n
quartz-n
fluorine-doped quartz)/n
quartz<0.05%, core district diameter is 17 μm ~ 120 μm, described clad region with pure silicon dioxide glass for substrate, include the doping unit of the periodicity close packed array of 2 ~ 5 layers, each doping unit is made up of the quartz pushrod that adulterates, and wherein ground floor comprises 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rods.The second layer and with outer field doping unit by fluorine-doped quartz bar construction, the pitch lambda between any two doping quartz pushrods are equal and be more than or equal to 3 μm, and outermost layer is pure quartz glass surrounding layer.Method for making of the present invention adopts common heap drawing process, simple and easy to do.The present invention make use of total internal reflection and photonic band gap effects two kinds of guide-lighting principles simultaneously, realizes larger mode field area.
Description
Technical field
The present invention relates to a kind of optical fiber with big mode field area, be specifically related to a kind of big mode field area total solids microstructured optical fibers and manufacture method thereof, belong to energy transmission optical fibre technical field.
Technical background
High power solid state laser development has two important directions: thin-sheet laser and fiber laser.Usually said fiber laser is exactly adopt optical fiber as the laser instrument of gain medium.For the single mode fiber laser of routine, require that the pump light being injected into fibre core is also necessary for single mode, what which has limited pump light enters fine efficiency, cause the output power of fiber laser and efficiency lower.The proposition of doubly clad optical fiber, for the output power and conversion efficiency improving fiber laser provides effective technological approaches, changing fiber laser can only as a kind of history of miniwatt photonic device.Consider the reasons such as conversion quantum efficiency, threshold for resisting laser damage and base substrate loss, mixing ytterbium quartz doubly clad optical fiber is the optimal selection realizing high-capacity optical fiber laser or amplifier.Along with the development of doubly clad optical fiber manufacture craft and high-power semiconductor laser pump technology, the output power of single double-clad optical fiber laser progressively improves, and continuous power output reaches multikilowatt.
The big mode field area fibers being applied to high power fiber laser at present has following a few class:
The first kind is common big mode field area doubly clad optical fiber.In doubly clad optical fiber, refractive index is the distribution of typical phase step type, and for the doped core of circle, can double-clad optical fiber laser realize single-mode laser and export, and depends on diameter d and the numerical aperture NA of fibre core.The obstacle promoting fiber laser output power mainly comes from doped core, and one is the damage from laser of fiber end face, and two is the nonlinear effects in optical fiber.The laser damage threshold of pure quartz is very high, and the damage threshold under pulse laser is about 100W/ μm
2, calculate with this, Typical single mode fibre core seems can realize exporting up to kilowatt magnitude laser power.In fact, 100W/ μm
2be the peak power density of pulse laser, for continuous laser, the laser threshold of quartz can much smaller than this value.Particularly for doping silica fibre, the purity caused owing to adulterating and the reduction of homogeneity, greatly reduce the laser damage threshold of fiber end face.In order to ensure the stable and reliable of fiber laser, generally get 1.5W/ μm when fiber laser designs
2.Accordingly, for the doubly clad optical fiber of typical 6 ~ 10 μm of core diameters, its laser power in the cards is also just in hectowatt magnitude.In order to realize the Laser output of low-order mode, high light beam quality, and overcome end face damage from laser as far as possible and these two factors of nonlinear effect improve the restriction brought to power, when designing and selecting optical fiber, NA should be reduced as far as possible, and corresponding increase core diameter, thus make fundamental transverse mode LP
01mode field diameter become large, thus realize big mode field area fibers (large-mode-areafiber, LMAF).But due to the restriction of fiber optic materials selection itself, for the doubly clad optical fiber of index steps distribution, fibre core NA also can not be very little.Current technical attainable minimum NA is 0.05 ~ 0.06, and corresponding maximum fiber core with single-mold diameter is about 17 μm.The increase of core area improves the threshold value of damage from laser and nonlinear effect on the one hand, also makes the energy storage of optical fiber increase simultaneously, is conducive to improving pulse energy; On the other hand, the ratio that fibre core and inner cladding cross-sectional amass also increases greatly, improves the efficiency of optical fiber to pump absorption, shorter optical fiber so just can be adopted to realize high power laser light and export.Equally, shortening of fiber lengths is also conducive to overcoming the restriction that nonlinear effect improves output power.Just because of the appearance of big mode field area fibers, add the development of high power pump coupling technique, just make the output power of fiber laser in recent years be able to quick raising.
Based on this common doubly clad optical fiber, consider the nonlinear effect in the damage from laser of fiber end face and optical fiber, single doubly clad optical fiber will realize multikilowatt or higher power stage, with regard to the restriction of Gonna breakthrough single-mode fiber, adopt multimode doubly clad optical fiber, this just brings again the multi-mode field oscillation problem of optical-fiber laser.The multimode output of big mode field area optical-fiber laser does not wish to occur, in order to overcome this problem, people conduct in-depth research in optical fiber structure design and optical fiber coiled fashion, proposes the Schema control or mode selection techniques that realize low-mode laser output.Winding method transverse mode control technology and optical fiber draw cone method transverse mode control technology to be the method for optimization beam quality common at present.
Equations of The Second Kind is big mode field area double-clad photon crystal optical fibre.Jump out the concept of common double cladded-fiber, adopt photonic crystal fiber fabrication techniques doubly clad optical fiber, spilehole of arranging according to certain rules around the doped core of optical fiber forms inner cladding, to play modulation inner cladding refractive index, to make the equivalent refractive index of inner cladding reduce, and ensure the object of flashlight single mode transport.Adopt the photonic crystal double-clad optical fiber of this technology to achieve the large mode field diameter of single mode, mode field area can reach 1000 μm
2above.This optical fiber represents an important research direction at present in super high power laser technique.This optical fiber have employed air cladding layer technology, although the design restriction breaching ordinary optic fibre achieves larger mode field area, due to the existence of airport, makes this optical fiber relative ordinary optic fibre in end face processing process, coupling etc. want complicated a lot.And due to the manufacturing technology relative complex of this doubly clad optical fiber, therefore involve great expense.Although can realize the manufacture of this type optical fiber at present, its performance has had much room for improvement.For above-mentioned reasons, the practical application of this optical fiber is still limited to very much.
3rd class is that more novel super large mode field area consolidates microstructured optical fibers entirely.This optical fiber refers to one and utilizes microstructure doped region (referring to mix the quartz material unit of fluorine) to substitute pore in conventional large mode area pcf, thus realizes the optical fiber of complete solid large mould field transmission.This optical fiber is the optical fiber of refractive-index-guiding type principle completely, and its guide-lighting principle is consistent with ordinary optic fibre.The concept of this optical fiber was suggested in 2009 (JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL.27, NO.11, JUNE1,2009) at first.This optical fiber adopts larger fluorine-doped quartz material cell to replace gas cell distribution in quartz material background, the common photonic crystal fiber of similar.But the core district generally only having a circle to mix fluorine region to form around pure quartz material, easier on therefore making, and can very large mode field area be realized.This is because in this structured optical fiber, the fluorine covering of mixing of particular design is very large for the limitation loss difference of basic mode and higher order mode, and the limitation loss for basic mode is compared to the limitation loss of higher order mode can little hundreds of times (the latter and the former ratio be hereinafter referred to as loss ratio).Like this, higher order mode has dissipated very soon along with the transmission along optical fiber longitudinal direction, and that can stay fibre core stable transfer only has basic mode.So just, achieve the optical fiber of super large mould field.It is reported, the optical fiber mode fields area of this design can reach square micron up to ten thousand.Research about this respect can see with Publication about Document: 6July2009/Vol.17, No.14/OPTICS EXPRESS11782; JOURNAL OF LIGHTWAVETECHNOLOGY, VOL.27, NO.11, JUNE1,2009; 16March2009/Vol.17, No.6/OPTICSEXPRESS4913.
Because this optical fiber based on the telecommunication optical fiber prefabricated rods manufacturing technology of maturation, can design and produce microstructure doped region; In conjunction with common heap daraf(reciprocal of farad) photonic crystal fiber manufacturing technology, stable technique and higher production efficiency can be realized.Therefore this optical fiber is a kind of more satisfactory high power laser light transmission medium.As in conjunction with rear-earth-doped prefabricated rods, then can realize the Active Optical Fiber (25May2009/Vol.17, No.11/OPTICS EXPRESS8962) of super large mould field.But also there is the problem of following three aspects in this optical fiber:
1, actual the implementing of the mode field diameter of super large is not desirable as bibliographical information here.The leakage loss that we test proves this optical fiber is higher.Such as form the quartz pushrod in core district and the surface of contact of surrounding fluorine-doped quartz rod, very slight depressed-index (-0.4*10 can be produced because of effect of stress after being drawn to the dimension of optical fiber
-4).Although variations in refractive index is very little, still can produce negative impact to mould field, this directly can destroy the unimodular property of optical fiber.
2, bending resistance remains to be further improved.Due to the mode field diameter of its super large, this makes the bending resistance of optical fiber be deteriorated, and this is very disadvantageous for practical application.If but mould field do less, the loss ratio of optical fiber will reduce, and be unfavorable for so again ensureing the single mode operation state of optical fiber.
3, the similar Gaussian of mould field shape.This is desirable for lower powered Laser Transmission, but is not then best mode for high-power Laser Transmission.Strongly concentrating on the Centromedian energy distribution of fibre core can make fibre core centre more easily be burnt.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that exists for above-mentioned prior art and provides a kind of total solid optical fiber with large-mode field area and manufacture method thereof, this optical fiber is guide-lighting machine-processed in conjunction with the total internal reflection principle two kinds of photonic band gap effects and correction, optical fiber is made both to have possessed larger mode field area by structural design, there is again good bending property, and possess the mould field shape of more uniform energy distribution, transmission or the amplification of high power laser light energy can be realized.
The optical fiber technology scheme that the problem that the present invention is the above-mentioned proposition of solution adopts is:
Comprise core district and clad region, core district is positioned at optical fiber center, and core district is made up of pure quartz or the quartz glass of mixing fluorine, mixes Funing tablet and meets: 0≤(n
quartz-n
fluorine-doped quartz)/n
quartz<0.05%, here n
quartzfor the refractive index of pure quartz glass, n
fluorine-doped quartzfor the refractive index of fibre core fluoro-alloyed quartz glass;
Described core district diameter D
corebe 17 μm ~ 120 μm, wherein Can Fu district diameter d
fluorine-doped quartzbe not more than 0.8D
core;
Described clad region for background material, includes the doping unit of the periodicity close packed array of 2 ~ 5 layers with pure silicon dioxide glass, and each doping unit is made up of the quartz pushrod that adulterates;
Described ground floor doping unit is made up of 12 doping quartz pushrods near core district, and comprising 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rods, 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rod interleaved are laid on position, a hexagonal corner;
The described second layer and with outer field doping unit by fluorine-doped quartz bar construction, all doping quartz pushrod diameters are identical, and pitch lambda between any two doping quartz pushrods (i.e. arbitrary neighborhood two adulterate the spacing between quartz pushrod center) are equal and be more than or equal to 3 μm;
Optical fiber outermost layer is the surrounding layer of pure quartz glass composition, i.e. mechanical covering.
By such scheme, mix the doping quartz pushrod of the peripheral fluorine doped layer of germanium centered by described composite mixed quartz pushrod, its refractive index profile is W type, the refractive index n in Can Zhe district, center
hmeet (n
h-n
quartz)/n
quartz>1.5%, peripheral fluorine doped layer is low-refraction bogging down area, its refractive index n
lmeet (n
l-n
quartz)/n
quartz<-0.3%; Can Zhe district diameter d
hwith outsourcing fluorine doped layer diameter d
lmeet between the two
By such scheme, the refractive index n of described fluorine-doped quartz rod
fmeet: (n
f-n
quartz)/n
quartz<-0.1%.
By such scheme, described fluorine-doped quartz rod fluorine doped layer diameter d and arbitrary neighborhood two pitch lambda of adulterating between quartz pushrod meet 0.6<d/ Λ <0.95.
By such scheme, 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rod interleaved of described ground floor doping unit are laid on an orthohexagonal limit, position, angle, wherein 6 composite mixed quartz pushrods are laid in the points of tangency place of regular hexagon and its incircle respectively, and 6 fluorine-doped quartz rods are laid in each summit place orthohexagonal respectively.
By such scheme, the glass diameter of described optical fiber, i.e. the diameter D of pure quartz glass surrounding layer
glassit is 110 μm ~ 1000 μm.Representative diameter is 125 μm, 200 μm, 400 μm, 600 μm, 800 μm, correspondingly its core diameter D
corerepresentative value be 20 μm, 30 μm, 50 μm, 75 μm, 100 μm.
By such scheme, described optical fiber can meet minimum bending radius R when macrobending loss is not more than 0.5dB on 1.06 mum wavelengths
minmeet: R
min≈ 2000D
core.
The manufacture method technical scheme of optical fiber of the present invention is:
By set optical fiber structure requirement, adopt PCVD technique (plasma chemical vapor deposition) make respectively micro-mix fluorine plug, composite mixed quartz pushrod and fluorine-doped quartz rod, three kinds of excellent external diameters control in 0.6 ~ 5mm scope, and composite mixed quartz pushrod is identical with the external diameter of fluorine-doped quartz rod
Periodically closed packed arrangement, namely also the structural arrangement mode of photonic crystal fiber to be arranged composite mixed quartz pushrod and fluorine-doped quartz rod around plug, and is adhesively fixed,
The above-mentioned structure arranged is inserted in the suitable pure quartz glass sleeve of size, forms preform,
Optical fiber is gone out by conventional quartz glass spinning process drawing by preform clamping to fiber drawing tower.
Beneficial effect of the present invention is: the cladding structure 1, mixing fluorine rod composition ensure that the basic optical performance of optical fiber, and principle is exactly the principle (Vol.24, No.8/August2007/J.Opt.Soc.Am.B1689) of leakage channel optical fiber (LCF).Around core district, the effect of six composite mixed rods is then produce photonic band gap effects, the light of optical fiber to certain wave band is made to produce strong restriction, this is very useful to the modulation of some optical-fiber laser outgoing spectrum, thus reduces to mix merely the excellent problem forming covering and bring fibre loss higher of fluorine.Simultaneously outstanding feature of the present invention make use of total internal reflection and photonic band gap effects two kinds of guide-lighting principles, achieve all solidstate of optical fiber and possess large mould field transmittability, realize larger mode field area, mode field area can reach hundreds of square micron so that thousands of square micron; 2, fiber cores district is the quartz material mixing fluorine on a small quantity, can reduce the refractive index of central authorities of core district like this, and playing a core district optical power adjustment is more equally distributed form, thus improves the damage threshold of core district when high power transmission.By designing core district refractive index profile, the mode distributions of Gaussian is made to be modified to the mode distributions of trend step change type, this is conducive to luminous power and is more evenly distributed in core district, avoid energy concentration of local and burn out optical fiber, the overlapping degree of foundational model field and whole fibre core can also be improved simultaneously, the Active Optical Fiber of this point to this type of is very useful, because for Active Optical Fiber, mode competition problem is there is between basic mode and high-order mode, when pump light is fully absorbed by basic mode, other higher order mode is excited being difficult to, thus ensure that the beam quality that optical-fiber laser exports, optical fiber of the present invention is made to be applicable to very much the transmission of high power laser light energy, 3, the cladding structure of fluorine-doped quartz rod composition makes the present invention obtain good bending property.4, covering makes and adopts common heap daraf(reciprocal of farad) photonic crystal fiber manufacturing technology, can realize stable technique and higher production efficiency.
Accompanying drawing explanation
Fig. 1 is the optical fiber structure schematic diagram of one embodiment of the invention.
Fig. 2 is the refractive index profile figure in one embodiment of the invention SMIS district.
Fig. 3 is the refractive index profile figure of composite mixed rod in one embodiment of the invention.
Fig. 4 is the refractive index profile figure of fluorine-doped quartz rod in one embodiment of the invention.
Fig. 5 is basic mode transmission mode figure and the 3-D view thereof of the present invention 1.02 mum wavelength optical fiber.
Fig. 6 is basic mode transmission mode figure and the 3-D view thereof of the present invention 1.03 mum wavelength optical fiber.
Fig. 7 is basic mode transmission mode figure and the 3-D view thereof of the present invention 1.08 mum wavelength optical fiber.
Fig. 8 is the basic mode transmission mode figure of the present invention 1.1 mum wavelength optical fiber.
Fig. 9 is the limitation loss that calculates of the present invention and band gap distribution plan thereof.
Figure 10 is the graphs of a relation of 1.1 ~ 1.2 μm of loss ratios calculating of the present invention with wavelength.
Embodiment
Below in conjunction with accompanying drawing, by embodiment further instruction content of the present invention.
Fig. 1 is the basic structure schematic diagram of one embodiment of the invention.Optical fiber comprises core district and clad region.Core district is positioned at the central authorities of optical fiber, comprise center 11 and marginal portion 12, center material consists of micro-quartz glass mixing fluorine, mixes the refractive index contrast that fluorine causes and causes pure quartz material refractive index down ratio for-0.01%(refers to mix fluorine), diameter is 25 μm; Refractive index profile is shown in Fig. 2, and marginal portion is silica glass, is the same materials with 13.Clad region with pure silicon dioxide glass for substrate 13, include the doping unit of the periodicity close packed array of 2 layers, namely arrangement mode is identical with the closed packed arrangement of photonic crystal fiber covering, each doping unit is made up of the quartz pushrod that adulterates, described ground floor doping unit is made up of 12 doping quartz pushrods near core district, comprising 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rods, 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rod interleaved are laid on position, an orthohexagonal corner, wherein 6 composite mixed quartz pushrods are laid in the points of tangency place of regular hexagon and incircle respectively, 6 fluorine-doped quartz rods are laid in intersection, orthohexagonal each limit respectively.Described composite mixed quartz pushrod is the composite mixed quartz pushrod that germanium outsourcing fluorine doped layer 16 is mixed in core district 15, and its refractive index profile is the refractive index n in W type, germnium doped core district
hmeet (n
h-n
quartz)/n
quartz=2.3%, outsourcing fluorine doped layer is low-refraction bogging down area, its refractive index n
lmeet (n
l-n
quartz)/n
quartz=-0.59%; Germnium doped core district diameter d
hbe 2 μm, outsourcing fluorine doped layer diameter d
lit is 4 μm.The refractive index n of described fluorine-doped quartz rod 14
fmeet (n
f-n
quartz)/n
quartz=-0.41%, diameter d is 6 μm, and described second layer doping unit is by fluorine-doped quartz bar construction; All doping quartz pushrods, comprise composite mixed quartz pushrod and fluorine-doped quartz rod, and the center distance between any two doping quartz pushrods and pitch lambda are 9.5 μm.Outermost layer is pure quartz glass surrounding layer, and the diameter of surrounding layer is 200 μm.
More than be described as one of them embodiment (corresponding embodiment 2), below further additional notes content of the present invention in table form:
The method of following recycling finite element simulates the change curve of limitation loss with wavelength, as Fig. 9.As can be seen from this figure:
First: dotted line be when fibre core sink be 0 time, limitation loss figure when namely fibre core is made up of pure silicon dioxide material; Solid line be when fibre core mix fluorine sink concentration be 0.01% time limitation loss figure, add as seen sink after, significantly widened the high loss zone between band gap.Also make band gap sideband move to both sides, this serves the effect of mobile band gap sideband position simultaneously.It should be noted that, the cost adding the way of mixing fluorine material on a small quantity in core district is that limitation loss level entirety rises to some extent, (loss ratio refers to the ratio of second order mode limitation loss and fundamental mode confinement losses also to make loss ratio reduce to some extent in addition, so this value is larger, illustrate that optical fiber is stronger in the ability of this wavelength maintenance single mode operation).But nonetheless, the loss ratio of two kinds of situations all more than 30, the namely limitation loss of second order mode more than 30 times (see figure 10)s higher than basic mode.Visible optical fiber can at setting range of wavelengths with single mode work.
Second: interval at 1.1 ~ 1.2 mum wavelengths, loss is successively decreased, thus this optical fiber is conducive to the short-wave band of the gain spectral suppressing ytterbium, also can say that long-wave band laser is easy to starting of oscillation.From Fig. 9,10 and Fig. 5 ~ 8 also clearly can find out that the center in forbidden band is at 1.05 μm, 1.03 ~ 1.08 mum wavelengths are high loss zone; It is very low that 1.1 μm of losses have been fallen, and can guarantee single mode transport between 1.1 ~ 1.2 mum wavelengths.Low-loss district is in 1.1 ~ 1.6 mum wavelength scopes and the scope that is less than 1 mum wavelength.Here, but be that design can carry out to the gain spectral short-wave band of ytterbium the large mould field optical fiber that causes the high loss zone object controlled near 1.1 μm.Fig. 5 ~ 8 are according to Fig. 9 result of calculation, at different wave length place, special calculating is carried out to the mode distributions of optical fiber basic mode, result shows that lonely mould field feature is completely consistent with Fig. 9 result of calculation, namely 1.03 ~ 1.08 mu m wavebands for transmission forbidden band (stopband), other wavelength are all then passband.
More than discuss and show, the present invention adopts this composite mixed rod and mixes the excellent mode combined of fluorine to form fiber cladding structure, namely ensure that optical fiber possesses the ability of big mode field area single mode operation, and optionally can suppress the light of some wave band.The photonic band gap effects that this dot matrix having benefited from composite mixed rod composition produces, and mix the leakage path principle of fluorine dot matrix generation.This optical fiber, because possess very large mode field area, is therefore well suited for the medium producing as high energy laser or transmit.
Claims (8)
1. a total solid optical fiber with large-mode field area, comprises core district and clad region, and core district is positioned at optical fiber center, and core district is made up of pure quartz or the quartz glass of mixing fluorine, mixes Funing tablet and meets: 0≤(n
quartz-n
fluorine-doped quartz)/n
quartz<0.05%, here n
quartzfor the refractive index of pure quartz glass, n
fluorine-doped quartzfor the refractive index of fibre core fluoro-alloyed quartz glass; Described core district diameter D
corebe 17 μm ~ 120 μm, wherein Can Fu district diameter d
fluorine-doped quartzbe not more than 0.8D
core; Described clad region for background material, includes the doping unit of the periodicity close packed array of 2 ~ 5 layers with pure silicon dioxide glass, and each doping unit is made up of the quartz pushrod that adulterates; Ground floor doping unit is made up of 12 doping quartz pushrods near core district, and comprising 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rods, 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rod interleaved are laid on position, a hexagonal corner; The second layer and with outer field doping unit by fluorine-doped quartz bar construction, all doping quartz pushrod diameters are identical, and the pitch lambda between any two doping quartz pushrods are equal and be more than or equal to 3 μm; Described composite mixed quartz pushrod is the composite mixed quartz pushrod that germanium outsourcing fluorine doped layer is mixed in core district, and optical fiber outermost layer is the surrounding layer of pure quartz glass composition.
2., by total solid optical fiber with large-mode field area according to claim 1, it is characterized in that described composite mixed quartz pushrod refractive index profile is the refractive index n in W type, germnium doped core district
hmeet (n
h-n
quartz)/n
quartz>1.5%, outsourcing fluorine doped layer is low-refraction bogging down area, its refractive index n
lmeet (n
l-n
quartz)/n
quartz<-0.3%; Germnium doped core district diameter d
hwith outsourcing fluorine doped layer diameter d
lmeet between the two
3., by the total solid optical fiber with large-mode field area described in claim 1 or 2, it is characterized in that the refractive index n of described fluorine-doped quartz rod
fmeet: (n
f-n
quartz)/n
quartz<-0.1%.
4., by total solid optical fiber with large-mode field area according to claim 1, it is characterized in that described fluorine-doped quartz rod fluorine doped layer diameter d and any two pitch lambda of adulterating between quartz pushrod meet 0.6<d/ Λ <0.95.
5. by total solid optical fiber with large-mode field area according to claim 3, it is characterized in that 6 composite mixed quartz pushrods and 6 fluorine-doped quartz rod interleaved of described ground floor doping unit are laid on position, an orthohexagonal corner, wherein 6 composite mixed quartz pushrods are laid in the points of tangency place of regular hexagon and incircle respectively, and 6 fluorine-doped quartz rods are laid in intersection, orthohexagonal each limit respectively.
6., by the total solid optical fiber with large-mode field area described in claim 1 or 2, it is characterized in that the diameter of described pure quartz glass surrounding layer is 110 μm ~ 1000 μm.
7., by total solid optical fiber with large-mode field area according to claim 3, it is characterized in that described optical fiber can meet minimum bending radius R when macrobending loss is not more than 0.5dB on 1.06 mum wavelengths
minmeet: R
min≈ 2000D
core.
8. the manufacture method of a total solid optical fiber with large-mode field area, it is characterized in that by the arbitrary optical fiber described in claim 1 ~ 7, adopt PCVD technique to make respectively and micro-ly mix fluorine plug, composite mixed quartz pushrod and fluorine-doped quartz rod, three kinds of excellent external diameters control in 0.6 ~ 5mm scope, and composite mixed quartz pushrod is identical with the external diameter of fluorine-doped quartz rod
Periodically closed packed arrangement, namely also the structural arrangement mode of photonic crystal fiber to be arranged composite mixed quartz pushrod and fluorine-doped quartz rod around plug, and is adhesively fixed,
The above-mentioned structure arranged is inserted in the suitable pure quartz glass sleeve of size, forms preform,
Optical fiber is gone out by conventional quartz glass spinning process drawing by preform clamping to fiber drawing tower.
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| CN104199142B (en) * | 2014-09-02 | 2017-03-08 | 鞍山睿科光电技术有限公司 | Crystal structure large-power optical fiber |
| CN109143457B (en) * | 2018-08-06 | 2020-02-11 | 武汉安扬激光技术有限责任公司 | Large-mode-field all-solid-state optical fiber and preparation method thereof |
| CN111061007B (en) * | 2020-01-06 | 2020-09-15 | 浙江大学 | Design method of quantum dot doped large-mode-field-area photonic crystal fiber |
| CN111897043B (en) * | 2020-07-20 | 2022-07-05 | 江苏永鼎股份有限公司 | Large mode field microstructure optical fiber |
| CN114690309A (en) * | 2022-02-23 | 2022-07-01 | 上海大学 | Visible light waveband quartz fluorescent optical fiber and preparation method thereof |
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