CN102401934B - Flattened dispersion photonic crystal optical fiber - Google Patents
Flattened dispersion photonic crystal optical fiber Download PDFInfo
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- CN102401934B CN102401934B CN201010279640.2A CN201010279640A CN102401934B CN 102401934 B CN102401934 B CN 102401934B CN 201010279640 A CN201010279640 A CN 201010279640A CN 102401934 B CN102401934 B CN 102401934B
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- layer
- optical fiber
- airport
- radius
- air holes
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Abstract
The invention discloses a flattened dispersion photonic crystal optical fiber. A cladding of the optical fiber consists of a plurality of layers of air holes arranged at nodes of a regular hexagon grid, wherein the radius of the first layer of the air holes is d1, the radius of the fourth layer of the air holes is d4, the radius of other layers of the air holes is d, the center distance of adjacent air holes is Lambada, and d is larger than d1 and smaller than Lambada as well as larger than d4 and smaller than Lambada; and a fiber core of the optical fiber is in a double-layer fiber core structure, an inner layer fiber core is a high-refractive-index core zone formed by deletion of the holes at the nodes of the regular hexagon grid, and the outer layer fiber core is a high-refractive-index core zone formed by reducing the diameters of the fourth layer of the air holes. The flattened dispersion photonic crystal optical fiber having high nonlinearity and small normal dispersion value disclosed by the invention can adapt to high-power pulse lasers with different pumping wavelength and can combined with the high-power pulse lasers to compose a wideband flattened super-continuum spectrum light source in 1.55 mum communication waveband.
Description
Technical field
The present invention relates to optical fiber technology field, particularly relate to a kind of dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value.
Background technology
In high speed, high-capacity optical fiber communication network, in order to obtain larger message capacity, current trend is by wavelength-division multiplex (Wavelength Division Multiplexing, WDM) technology and Optical Time Division Multiplexing (Optical Time Division Multiplexing, OTDM) technology combines, and by OTDM technology, improves the single channel capacity of wdm system.The gordian technique of this optical communication mode is the ultrashort light pulse source that how to obtain high-repetition-rate, multi-wavelength.The light source that current wdm system adopts is the semiconductor laser identical with the number of channel mostly, expensive and system of systems is complicated.
Photonic crystal fiber
[1], be called again microstructured optical fibers or porous optical fiber, be that develop rapidly in recent years a kind of has the novel optical fiber that higher scientific research was worth and caused extensive concern, it is along fiber axis to the airport that is distributing according to certain rule and extending.By the transversary of appropriate design photonic crystal fiber, can obtain high nonlinear factor and suitable dispersion characteristic, be the good medium that produces super continuous spectrums
[2,3].For super continuum source, the width of spectrum and flatness are to weigh two key factors of spectral quality, particularly for wdm optical communication system, it requires to provide the multi-wavelength channel of power equalization in very wide wavelength band, and 1.55 μ m optical communicating wavebands, broadband, smooth super continuous spectrums can meet the requirement of bandwidth, have reduced again the technical difficulty of power equalization.Therefore for the requirement adapting in wdm system is necessary that development has the dispersed flat photon crystal fiber of high non-linearity and little normal dispersion value very much.
List of references above-mentioned is as follows:
[1]J.C.Knight,T.A.Birks,P.S.J.Russell,“All-cilica?single-mode?optical?fiber?with?photonics?crystal?cladding”,Opt.Lett.,V.21(19),1996,1547-1549.
[2]Xu?Yong-Zhao,Ren?Xiao-Min,Zhang?Xia,Huang?Yong-Qing,“Flat?supercontinuum?generated?in?a?single-mode?optical?fibre?with?a?new?chromatic?dispersion?profile”,Chin.Phys.Lett.,V.22(8),2005,1923-1926.
[3]Y.Xu,X.Ren,Z.Wang,X.Zhang?and?Y.Huang,“Flatly?broadened?supercontinuum?generation?at10Gbit/s?using?dispersion-flattened?photonic?crystal?fibre?with?small?normal?dispersion”,Electron.Lett.,V.43(2),2007,87-88。
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is how a kind of dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value is provided, to adapt to the high power pulsed laser of different pumping wavelengths, and be combined with high power pulsed laser and form 1.55 μ m communication bands, broadband, smooth super continuum source.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of dispersed flat photon crystal fiber, the airport that the covering of this optical fiber is positioned on regular hexagonal cell node by multilayer forms, and ground floor airport radius is d
1, the 4th layer of air pore radius is d
4, other layer of air pore radius are d, the hole centre distance of adjacent vacant pore is Λ, wherein, d
1<d< Λ and d
4<d< Λ; The fibre core of this optical fiber is double-deck core structure, and internal layer fibre core is the high index of refraction core district that the disappearance by the airport on regular hexagonal cell node forms, and outer fibre core is the high index of refraction core district that is reduced to form by the 4th layer of air bore dia; Wherein the span of d4/ Λ and d1/ Λ is 0.38-0.45; The span of d/ Λ is 0.75-0.82; And described the 4th layer of air pore radius d4 equals described ground floor airport radius d1.
Preferably, to be positioned at the airport on regular hexagonal cell node be that 8-10 layer is positioned at the airport on regular hexagonal cell node to described multilayer.
Preferably, described in, be positioned at the circle that is shaped as of airport on regular hexagonal cell node.
Preferably, the substrate of described optical fiber is quartz material.。
(3) beneficial effect
The present invention, by having proposed a kind of dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value, has following beneficial effect:
(1) by reduce the diameter in ground floor and the 4th layer of air hole simultaneously, form twin-core structure photonic crystal fiber, make this photonic crystal fiber there are little normal dispersion value and Parabolic smooth dispersion characteristics, there is higher nonlinear characteristic simultaneously;
(2) dispersed flat photon crystal fiber with high non-linearity and little normal dispersion is combined with high power pulsed laser, can forms 1.55 μ m communication bands, broadband, smooth super continuum source, and can greatly shorten the length of optical fiber used;
(3) by adjusting the hole center distance of two kinds of airport diameters and adjacent vacant pore, can adjust easily the nearest zero-dispersion wavelength of optical fiber, to adapt to the high power pulsed laser of different pumping wavelengths.
Accompanying drawing explanation
Fig. 1 is the structural representation of dispersed flat photon crystal fiber xsect of the present invention;
Fig. 2 is the dispersion curve figure of dispersed flat photon crystal fiber in the embodiment of the present invention 1;
Fig. 3 is the super continuous spectrums schematic diagram that the described dispersed flat photon crystal fiber of the embodiment of the present invention 1 produces at 1.55 μ m communication bands;
Fig. 4 is the dispersion curve figure of dispersed flat photon crystal fiber in the embodiment of the present invention 2.
Wherein, 1: internal layer fibre core; 2: outer fibre core; d
1: ground floor airport radius; d
2: second layer airport radius; d
3: the 3rd layer of air pore radius; d
4: the 4th layer of air pore radius; Λ: the hole center distance of adjacent vacant pore.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the structural representation of dispersed flat photon crystal fiber xsect of the present invention.As shown in Figure 1, wherein, ground floor airport radius d
1with the 4th layer of air pore radius d
4equate; Second layer airport radius d
2with the 3rd layer of air pore radius d
3all equal a constant d; The circular airport that the covering of this optical fiber for example, is positioned on regular hexagonal cell node by multilayer (8-10 layer) forms, and the centre distance of adjacent vacant pore is Λ; d
4<d< Λ and d
1<d< Λ; d
4/ Λ and d
1the span of/Λ is 0.38-0.45; The span of d/ Λ is 0.75-0.82.The fibre core of optical fiber is double-deck core structure, and internal layer fibre core is the high index of refraction core district that the disappearance by the hole on hexagonal mesh node forms, and outer fibre core is the high index of refraction core district that is reduced to form by the 4th layer of air bore dia; .
The dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value of the present invention is by reducing ground floor airport diameter d
1with the 4th layer of air bore dia d
4affect effective refractive index, and then affect dispersion and the chromatic dispersion gradient of optical fiber, can when obtaining little normal dispersion value and smooth dispersion, there is high nonlinear characteristic; The described dispersed flat photon crystal fiber substrate with high non-linearity and little normal dispersion value adopts pure quartz material; By regulating hole center distance Λ and the airport diameter d of airport
1can adjust the position of maximum dispersion values with d, to adapt to the high power pulsed laser of different pumping wavelengths.
Embodiment 1
For quartz material, photonic crystals optical fiber structure parameter: Λ=0.87 μ m, d
1/ Λ=d
4/ Λ=0.40, other layer of air bore dia meets d/ Λ=0.82, and corresponding dispersion curve is as shown in Figure 2.Dispersion curve presents following features:
(1), in the wavelength coverage of 1450nm to 1650nm, the dispersion values of photonic crystal fiber, within the scope of-1.65～-0.335ps/nm/km, has color dispersion plainness characteristic;
(2) present parabolic type;
(3) wavelength that maximum dispersion values is corresponding is 1550nm.
Nonlinear factor at 1550nm wavelength place is 33.8W
-1km
-1.When the incident wavelength of short-pulse laser is 1550nm, pulse full width at half maximum is 1.6ps, when pump power is 20dBm, 25dBm, 26dBm and 29dBm, and the super continuous spectrums producing after this dispersed flat photon crystal fiber transmission of growing by 80m, as shown in Figure 3.When pump power is 29dBm, can produce three dB bandwidths at 1.55 μ m communication bands be 125nm(1496nm-1621nm) smooth super continuous spectrums, described three dB bandwidth be than the little 3dB(of peak power be peak value 50%) time the bandwidth of spectral range.
Embodiment 2
For quartz material, photonic crystals optical fiber structure parameter: Λ=0.82 μ m, d
1/ Λ=d
4/ Λ=0.39, other layer of air bore dia meets d/ Λ=0.81, and corresponding dispersion curve is as shown in Figure 4.Dispersion curve presents following features:
(1), in the wavelength coverage of 1400nm to 1600nm, the dispersion values of photonic crystal fiber, within the scope of-11.2～-7.8ps/nm/km, has color dispersion plainness characteristic;
(2) present parabolic type;
(3) wavelength that maximum dispersion values is corresponding is 1450nm.
Nonlinear factor at 1450nm wavelength place is 40.5W
-1km
-1.
The drawing method of brief description dispersed flat photon crystal fiber of the present invention.
The drawing method of dispersed flat photon crystal fiber adopts existing kapillary to pile up drawing technology.First quartzy prefabricated rods is worn into hexagonal configuration, Bing Jiang empties at center, then in wire-drawer-tower, pulls into the approximately hollow kapillary of 0.8～2mm of external diameter; Then in the ratio of designing requirement size, select quartz pushrod and quartz ampoule to pile up moulding, additional resistant to elevated temperatures filament is tightened or is fixed with sleeve pipe; Finally on fiber drawing tower, be drawn into qualified photonic crystal fiber.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (4)
1. a dispersed flat photon crystal fiber, is characterized in that, the airport that the covering of this optical fiber is positioned on regular hexagonal cell node by multilayer forms, and ground floor airport radius is d
1, the 4th layer of air pore radius is d
4, other layer of air pore radius are d, the hole center distance of adjacent vacant pore is Λ, wherein, d
1<d< Λ and d
4<d< Λ; The fibre core of this optical fiber is double-deck core structure, and internal layer fibre core is the high index of refraction core district that the disappearance by the airport on regular hexagonal cell node forms, and outer fibre core is the high index of refraction core district that is reduced to form by the 4th layer of air bore dia; D wherein
4/ Λ and d
1the span of/Λ is 0.38-0.45; The span of d/ Λ is 0.75-0.82; And described the 4th layer of air pore radius d
4equal described ground floor airport radius d1.
2. dispersed flat photon crystal fiber as claimed in claim 1, is characterized in that, the airport that described multilayer is positioned on regular hexagonal cell node is that 8-10 layer is positioned at the airport on regular hexagonal cell node.
3. dispersed flat photon crystal fiber as claimed in claim 1, is characterized in that, described in be positioned at the circle that is shaped as of airport on regular hexagonal cell node.
4. dispersed flat photon crystal fiber as claimed in claim 1, is characterized in that, the substrate of described optical fiber is quartz material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010279640.2A CN102401934B (en) | 2010-09-10 | 2010-09-10 | Flattened dispersion photonic crystal optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010279640.2A CN102401934B (en) | 2010-09-10 | 2010-09-10 | Flattened dispersion photonic crystal optical fiber |
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| Publication Number | Publication Date |
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| CN102401934A CN102401934A (en) | 2012-04-04 |
| CN102401934B true CN102401934B (en) | 2014-12-10 |
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| CN201010279640.2A Expired - Fee Related CN102401934B (en) | 2010-09-10 | 2010-09-10 | Flattened dispersion photonic crystal optical fiber |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967981A (en) * | 2012-12-18 | 2013-03-13 | 中国人民解放军国防科学技术大学 | Super-continuous spectrum light source based on multicore photonic crystal fiber |
| CN103257396B (en) * | 2013-04-16 | 2015-04-15 | 中南民族大学 | Dispersion flatted photonic crystal fiber and dispersion regulation and control method thereof |
| CN106255907B (en) * | 2014-03-25 | 2020-01-24 | Nkt光子学有限公司 | Microstructured optical fiber and supercontinuum light source |
| CN106154403A (en) * | 2016-07-11 | 2016-11-23 | 合肥工业大学 | A kind of high double-refraction photon crystal fiber based on chalcogenide glass |
| CN108152881B (en) * | 2018-01-26 | 2020-01-07 | 西安邮电大学 | Chalcogenide high-birefringence photonic crystal fiber in waveband range of 2-5 microns |
| CN108415121B (en) * | 2018-05-07 | 2024-04-16 | 上海理工大学 | High-birefringence double-core photonic crystal fiber polarization beam splitter |
| CN114740566B (en) * | 2022-03-11 | 2023-05-02 | 中国科学院西安光学精密机械研究所 | Polymer microstructure optical fiber and optical fiber image transmission beam for terahertz wave high-performance imaging |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1670552A (en) * | 2005-04-15 | 2005-09-21 | 清华大学 | Large mode field area large chromatic dispersion photonic crystal fiber |
| CN200968995Y (en) * | 2006-10-27 | 2007-10-31 | 浙江工业大学 | Dispersion flat photonic optical fiber |
| CN101082686A (en) * | 2007-05-29 | 2007-12-05 | 电子科技大学 | Novel method for determining optical fiber parameter |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1670552A (en) * | 2005-04-15 | 2005-09-21 | 清华大学 | Large mode field area large chromatic dispersion photonic crystal fiber |
| CN200968995Y (en) * | 2006-10-27 | 2007-10-31 | 浙江工业大学 | Dispersion flat photonic optical fiber |
| CN101082686A (en) * | 2007-05-29 | 2007-12-05 | 电子科技大学 | Novel method for determining optical fiber parameter |
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| CN102401934A (en) | 2012-04-04 |
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