CN102819062B - Air hole square array fiber core annular doping four-core photonic crystal fiber - Google Patents
Air hole square array fiber core annular doping four-core photonic crystal fiber Download PDFInfo
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- CN102819062B CN102819062B CN201210268078.2A CN201210268078A CN102819062B CN 102819062 B CN102819062 B CN 102819062B CN 201210268078 A CN201210268078 A CN 201210268078A CN 102819062 B CN102819062 B CN 102819062B
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Abstract
The invention relates to an air hole square array fiber core annular doping four-core photonic crystal fiber, which comprises a fiber cladding and fiber cores, wherein the fiber cladding is formed by distributing a plurality of layers of air hole square arrays; the fiber core is formed by four groups of units lack of air holes; and the four fiber cores are symmetrically distributed at diagonal lines of four quadrants. Each fiber cores comprises an inner core and a doping annular area, wherein the inner core and the fiber cladding are made of quartz materials, and the doping annular area wrapped outside the inner core is made of quartz doped with an oxide capable of increasing a refractive index, so that the refractive index of the doping annular area is a little higher than that of the fiber core. With the adoption of the fiber core annular doping four-core structure, the mode area can be efficiently increased, and the nonlinear effect can be reduced. The fiber core annular doping can form a flat mode field, thereby efficiently reducing the thermal damage effects of the fiber. The fiber cladding is formed by distributing the plurality of layers of air hole square arrays, so that the ultralow limit loss can be realized, and the energy loss can be greatly reduced in the transmitting process.
Description
Technical field
The present invention relates to a kind of airport square arrangement fibre core ring-type doping four-core photonic crystal fiber, relate in particular to the photonic crystal fiber simultaneously with flat-top die field, large model area and ultra-low limitation loss, belong to optical fiber technology field.
Background technology
High-capacity optical fiber laser, due to the advantage at aspects such as efficiency, heat radiation and beam qualities, is with a wide range of applications in fields such as industrial processes, medical treatment and national defence.But the nonlinear effects such as Raman scattering, Brillouin scattering and four-wave mixing have limited the further raising of high-level efficiency fiber laser output power.Between nonlinear effect and light intensity, there are much relations, can effectively reduce light intensity by the pattern area that improves optical fiber, and then nonlinear effect is produced to inhibiting effect.Photonic crystal fiber (PCF), be otherwise known as microstructured optical fibers or porous optical fiber, its structural design is adjustable flexibly, and this makes it have the characteristic that many traditional fiber do not possess, as high birefringence, ultra-low limitation loss, dispersion is adjustable etc.The invention of this kind of optical fiber provides a kind of very effective way for realizing large model area.
There are some researches prove, the silica core of photonic crystal fiber is adulterated, doping ZrO
2, TiO
2, Al
2o
3, GeO
2, P
2o
5can make the refractive index of quartz glass increase (highly doped) Deng material, doping B
2o
3, the raw material such as F can make the refractive index of quartz glass reduce (low-doped), the optical fiber after doping can obtain larger pattern area, but current this doping techniques is only confined to single-core fiber, has limited the further raising of pattern area.If employing multi-core fiber, although can obtain larger mode field area compared with single-core fiber, from its each fibre core, output beam is traditional Gaussian beam, in the time that pumping light power is larger, is easy to damage fiber end face.
Summary of the invention
The object of the invention is to provide a kind of a kind of airport square arrangement fibre core ring-type doping four-core photonic crystal fiber simultaneously with big mode field area, low limitation loss peace top-mould type.
The present invention adopts four-core photonic crystal fiber fibre core is adulterated, simultaneously covering airport structural parameters reasonable in design again.
The primary structure of photonic crystal fiber of the present invention is made up of four fibre cores and fibre cladding.Wherein, in fibre cladding, be provided with the airport of uniform multilayer square array column distribution, airport diameter d=4 μ m, two pitch of holes Λ=10 μ m.By the cell formation fibre core of 3 ' 3 airports of four groups of disappearances, four fibre cores are distributed on the diagonal line that airport square formation is four quadrants symmetrically.Wherein, each fibre core is made up of pure quartzy inner core and the high doping annular region of refractive index, and wherein the radius r a of quartzy inner core is in 6 ~ 10 μ m scopes.And the highly doped annular region wrapping in outside inner core is to have adulterated to increase the oxide-germanium dioxide of refractive index in quartz, and the mole percentage of doping is 4.11% ~ 4.38%, makes the refractive index (1.45) of refractive index (in 1.4502 ~ 1.4506 scopes) a little more than quartzy inner core.The outer shroud radius r b=18 μ m of this highly doped annular region, so highly doped annular region annulus thickness is the poor of its outer shroud radius r b and interior ring radius r a, i.e. rb-ra, is controlled within the scope of 8 ~ 12 μ m.
The present invention compared with prior art tool has the following advantages:
1, four-core photonic crystal fiber can effectively increase pattern area compared with single-core fiber, can bear stronger pump light, thereby effectively reduces the impact of nonlinear effect, greatly improves the threshold value of Optical Fiber Transmission laser power.
2, multilayer pore square arrangement formation covering makes limitation loss very low, and ultralow limitation loss has reduced the energy loss in transmitting procedure, can transmit high power.
3, owing to the annular region of four fibre cores having been carried out to increase the highly doped of refractive index, make the refractive index of annular region in fibre core higher than inner core refractive index, therefore from then on plant the light beam of exporting in optical fiber and be no longer Gauss's shape, but flat-top shape distributes, be that output beam is the flat-top die field that energy even distributes, have lower peak power, greatly improved the fire damage threshold value of optical fiber, this doping simultaneously also can make optical fiber obtain larger pattern area.
4, the fibre core being made up of pure quartzy inner core and highly doped annular region makes the effective model area of this optical fiber reduce with the increase of wavelength, and the effective model area of traditional fiber or photonic crystal fiber increases with the increase of wavelength.This is also a unique distinction of the present invention.
Accompanying drawing explanation
Fig. 1 is the photonic crystal fiber cross-sectional view of the embodiment of the present invention 1.
Fig. 2 is the photonic crystal fiber mould field pattern of the embodiment of the present invention 1.
Fig. 3 is that the effective model area of the embodiment of the present invention 1 photonic crystal fiber and limitation loss are with wavelength variations graph of a relation.
Fig. 4 is that the effective model area of the embodiment of the present invention 2 photonic crystal fibers and limitation loss are with wavelength variations graph of a relation.
Fig. 5 is that the effective model area of the embodiment of the present invention 3 photonic crystal fibers and limitation loss are with wavelength variations graph of a relation.
Fig. 6 is that the effective model area of the embodiment of the present invention 4 photonic crystal fibers and limitation loss are with wavelength variations graph of a relation.
Embodiment
In the photonic crystal fiber cross-sectional view of the embodiment of the present invention 1 shown in Fig. 1, this optical fiber is mainly made up of fibre core and fibre cladding.Wherein, in fibre cladding 1, there is 13 ' 13-3 ', 3 ' 4=133 the airport 2 of quadrate array uniformly, airport diameter d=4 μ m, two pitch of holes Λ=10 μ m.The cell formation fibre core of 3 ' 3 airports of four groups of disappearances, four fibre cores are distributed on the diagonal line of four quadrants symmetrically.Each fibre core includes the annular region 4 of inner core 3 and doping, wherein inner core is quartzy material, its radius r a=6 μ m, be the silica based germanium dioxide that molar percentage is 4.25% that adulterated and wrap in highly doped annular region outside inner core, making its refractive index is 1.4504, a little more than the refractive index 1.45 of quartzy inner core.The thickness of above-mentioned highly doped annular region be its outer shroud radius r b (be m) poor with interior ring radius r a of 18 μ, rb-ra=18-6=12 μ m.
At the optical fiber of the embodiment of the present invention 1 shown in Fig. 2, in the mould field pattern at 1.55 μ m places, as can be seen from the figure, the laser energy of each fibre core output is identical, and is uniformly distributed in core region, forms flat-top die field.
In the effective model area and the variation relation figure of limitation loss with wavelength of the embodiment of the present invention 1 optical fiber shown in Fig. 3, the effective model area of this optical fiber is at 2900 μ m
2above, belong to large model area fiber, and along with its effective model area of increase of wavelength reduces, at the μ m place, low-loss transmission window λ=1.55 of optical communication, its effective model area is 3107 μ m
2.In whole calculating wavelength coverage, the limitation loss of this optical fiber is all extremely low.At μ m place, transmission window λ=1.55, its limitation loss is 9.71 ' 10
-6dB/km.
The embodiment of the present invention 2 is substantially the same manner as Example 1, and difference be the to adulterate molar percentage of germanium dioxide is reduced to the corresponding refractive index 1.4502 of 4.11%(), its effective model area and limitation loss are with the variation relation of wavelength as shown in Figure 4.As can be seen from the figure, this optical fiber, compared with embodiment 1 optical fiber, has obtained less effective model area and the limitation loss of Geng Gao.At μ m place, λ=1.55, its effective model area is 2934 μ m
2, limitation loss is 1.42 ' 10
-4dB/km.
Embodiment 3
The embodiment of the present invention 3 is substantially the same manner as Example 1, and difference be the to adulterate molar percentage of germanium dioxide is increased to the corresponding refractive index 1.4506 of 4.38%(), its effective model area and limitation loss are with the variation relation of wavelength as shown in Figure 5.As can be seen from the figure, this optical fiber has obtained larger effective model area and lower limitation loss compared with the first embodiment optical fiber.At μ m place, λ=1.55, its effective model area is 3244 μ m
2, limitation loss is 1.32 ' 10
-6dB/km.
Embodiment 4
The embodiment of the present invention 4 is substantially the same manner as Example 1, and difference is interior fiber core radius r
abe increased to 10 μ m, the thickness r of the annulus part of adulterating
b-r
a=18-10=8 μ m, its effective model area and limitation loss are with the variation relation of wavelength as shown in Figure 6.As can be seen from the figure, this optical fiber, compared with embodiment 1 optical fiber, has obtained larger effective model area, but limitation loss also increases to some extent.At μ m place, λ=1.55, its effective model area is 3395 μ m
2, limitation loss is 1.02 ' 10
-4dB/km.
Claims (2)
1. an airport square arrangement fibre core ring-type doping four-core photonic crystal fiber, it is made up of fibre core and fibre cladding, it is characterized in that: in fibre cladding, be provided with uniform multilayer square array column distribution airport, airport diameter d=4 μ m, two pitch of holes Λ=10 μ m, by the cell formation fibre core of 9 airports of four groups of disappearances, four fibre cores are distributed on the diagonal line of four quadrants symmetrically, each fibre core is made up of the doping annular region that in pure quartzy inner core and quartz, doping germanium dioxide forms, the wherein radius r of quartzy inner core
aat 6～10 μ m, the external radius r of doping annular region
b=18 μ m, the thickness of doped region annulus is r
b-r
abe controlled in 8～12 μ m.
2. a kind of airport square arrangement fibre core ring-type doping four-core photonic crystal fiber according to claim 1, it is characterized in that: its refractive index of doping annular section that wraps in inner core outside is controlled in 1.4502～1.4506 scope, a little more than the refractive index 1.45 of quartzy inner core.
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|---|---|---|---|
| CN201210268078.2A CN102819062B (en) | 2012-07-31 | 2012-07-31 | Air hole square array fiber core annular doping four-core photonic crystal fiber |
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| CN201210268078.2A CN102819062B (en) | 2012-07-31 | 2012-07-31 | Air hole square array fiber core annular doping four-core photonic crystal fiber |
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| CN102819062B true CN102819062B (en) | 2014-06-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760631B (en) * | 2013-12-13 | 2016-08-17 | 合肥工业大学 | A kind of Ge-doped double-core photonic crystal fiber |
| CN112859234B (en) * | 2021-03-03 | 2022-04-29 | 唐山学院 | Microstructure optical fiber broadband polarization filter with tunable filtering direction |
| CN113031147B (en) * | 2021-03-15 | 2022-11-25 | 南京邮电大学 | Homogenization optical fiber with multilayer square structure |
| CN113662658A (en) * | 2021-08-26 | 2021-11-19 | 桂林电子科技大学 | Medical optical fiber integrating annular core and image transmission bundle and preparation method thereof |
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| US6301420B1 (en) * | 1998-05-01 | 2001-10-09 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Multicore optical fibre |
| GB9929344D0 (en) * | 1999-12-10 | 2000-02-02 | Univ Bath | Improvements in or relating to photonic crystal fibres |
| CN101622560A (en) * | 2007-03-05 | 2010-01-06 | 株式会社藤仓 | Photonic band gap fiber |
| CN101339820B (en) * | 2008-08-19 | 2010-12-15 | 清华大学 | Manufacturing method of light and electricity co-transmission fiber |
| EP2369380A4 (en) * | 2008-12-24 | 2014-04-16 | Furukawa Electric Co Ltd | Multi-core optical fiber |
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