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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- 239000000835 fiber Substances 0.000 title claims abstract description 62
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 21
- 239000013307 optical fiber Substances 0.000 claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005253 cladding Methods 0.000 claims abstract description 10
- 239000010453 quartz Substances 0.000 claims abstract description 7
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 claims description 9
- 229940119177 germanium dioxide Drugs 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 2
- 241001270131 Agaricus moelleri Species 0.000 abstract description 5
- 230000009022 nonlinear effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract 1
- 230000003685 thermal hair damage Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008034 disappearance Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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Abstract
一种空气孔正方形排列纤芯环状掺杂四芯光子晶体光纤，它由光纤包层和纤芯组成的。光纤包层由多层空气孔正方形阵列分布形成；四组缺失空气孔的单元构成纤芯，四个纤芯对称地分布在四个象限的对角线上。上述纤芯由内芯和掺杂型环状区域组成，其中内芯与光纤包层同为石英材质，而包在内芯外面的掺杂环状区域为石英内掺杂了增加折射率的氧化物，使其折射率略高于纤芯的折射率。本发明所采用的纤芯环状掺杂四芯结构可以有效地增大模式面积同时降低非线性效应，纤芯环状掺杂可以形成平顶模场，有效降低光纤的热损伤效应，多层空气孔正方形阵列分布形成包层可以实现超低限制损耗，极大地减少传输过程中的能量损失。
The invention relates to a ring doped four-core photonic crystal fiber with air holes arranged in a square core, which is composed of an optical fiber cladding and a fiber core. The optical fiber cladding is formed by a square array of multi-layer air holes; four groups of units lacking air holes form the core, and the four cores are symmetrically distributed on the diagonals of the four quadrants. The above-mentioned fiber core is composed of an inner core and a doped annular region, in which the inner core and the fiber cladding are both made of quartz material, and the doped annular region wrapped outside the inner core is doped with an oxide that increases the refractive index in the quartz. material so that its refractive index is slightly higher than that of the core. The ring-shaped doped four-core structure of the fiber core used in the present invention can effectively increase the mode area while reducing the nonlinear effect. The ring-shaped doping of the fiber core can form a flat-top mode field, which can effectively reduce the thermal damage effect of the optical fiber. The air holes are distributed in a square array to form a cladding, which can achieve ultra-low confinement loss and greatly reduce energy loss during transmission.
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)
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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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| CN102819062A CN102819062A (en) | 2012-12-12 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | A kind of manufacturing method of photoelectric simultaneous transmission fiber |
| WO2010073821A1 (en) * | 2008-12-24 | 2010-07-01 | 古河電気工業株式会社 | Multi-core optical fiber |
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