CN102401934A - Flattened dispersion photonic crystal optical fiber - Google Patents
Flattened dispersion photonic crystal optical fiber Download PDFInfo
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- CN102401934A CN102401934A CN2010102796402A CN201010279640A CN102401934A CN 102401934 A CN102401934 A CN 102401934A CN 2010102796402 A CN2010102796402 A CN 2010102796402A CN 201010279640 A CN201010279640 A CN 201010279640A CN 102401934 A CN102401934 A CN 102401934A
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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 the 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 bigger message capacity; Present trend is with wavelength-division multiplex (Wavelength Division Multiplexing; WDM) (Optical Time Division Multiplexing, OTDM) technology combines technology, promptly improves the single channel capacity of wdm system with the OTDM technology with Optical Time Division Multiplexing.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, costs an arm and a leg and the system of systems complicacy.
Photonic crystal fiber
[1], be called microstructured optical fibers or porous optical fiber again, be a kind of novel optical fiber that has higher scientific research value and cause extensive concern that develops rapidly in recent years, it is along the airport of fiber axis to the extension that distributing according to certain rule.Through 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; Its requires in very wide wavelength band, to provide the multi-wavelength channel of power equalization, and 1.55 μ m optical communicating wavebands, broadband, smooth super continuous spectrums can satisfy the requirement of bandwidth, have reduced the technical difficulty of power equalization again.Therefore be necessary very much to develop dispersed flat photon crystal fiber for the requirement that adapts in the wdm system with high non-linearity and little normal dispersion value.
List of references above-mentioned is following:
[1]J.C.Knight，T.A.Birks，P.S.J.Russell，“All-cilica?single-modeoptical?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?at?10?Gbit/s?using?dispersion-flattened?photonic?crystal?fibre?with?small?normal?dispersion”，Electron.Lett.，V.43(2)，2007，87-88。
Summary of the invention
The technical matters that (one) will solve
The technical matters that the present invention will solve is how a kind of dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value is provided; Adapting to the high power pulsed laser of different pumping wavelengths, and combine to constitute 1.55 μ m communication bands, broadband, smooth super continuum source with high power pulsed laser.
(2) technical scheme
For solving the problems of the technologies described above, the present invention provides a kind of dispersed flat photon crystal fiber, and the covering of this optical fiber is made up of the airport that multilayer is positioned on the regular hexagon mesh node, 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 the internal layer fibre core is the high index of refraction core district that the disappearance by the airport on the regular hexagon 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.
Preferably, d
4/ Λ and d
1The span of/Λ is 0.38-0.45.
Preferably, the span of d/ Λ is 0.75-0.82.
Preferably, said the 4th layer of air pore radius d
4Equal said ground floor airport radius d
1
Preferably, the airport that is positioned on the regular hexagon mesh node of said multilayer is positioned at the airport on the regular hexagon mesh node for the 8-10 layer.
Preferably, the said circle that is shaped as that is positioned at airport on the regular hexagon mesh node.
Preferably, the substrate of said optical fiber is a quartz material.。
(3) beneficial effect
The present invention has following beneficial effect through having proposed a kind of dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value:
(1) forms the twin-core structure photonic crystal fiber through the diameter that reduces ground floor and the 4th layer of air hole simultaneously, make this photonic crystal fiber have little normal dispersion value and Parabolic smooth dispersion characteristics, have the higher non-linearity characteristic simultaneously;
The dispersed flat photon crystal fiber that (2) will have high non-linearity and little normal dispersion combines with high power pulsed laser, can constitute 1.55 μ m communication bands, broadband, smooth super continuum source, and can shorten used length of fiber greatly;
(3), can adjust the nearest zero-dispersion wavelength of optical fiber easily, to adapt to the high power pulsed laser of different pumping wavelengths through the hole center distance of two kinds of airport diameters of adjustment and adjacent vacant pore.
Description of drawings
Fig. 1 is the structural representation of dispersed flat photon crystal fiber xsect according to the invention;
Fig. 2 is the dispersion curve figure of dispersed flat photon crystal fiber in the embodiment of the invention 1;
Fig. 3 is the super continuous spectrums synoptic diagram that the said dispersed flat photon crystal fiber of the embodiment of the 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 invention 2.
Wherein, 1: the 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 accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Fig. 1 is the structural representation of dispersed flat photon crystal fiber xsect according to the 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 covering of this optical fiber is made up of the circular airport that multilayer (for example 8-10 layer) is positioned on the regular hexagon mesh node, 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 the internal layer fibre core is the high index of refraction core district that the disappearance by the hole on the 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;
Dispersed flat photon crystal fiber with high non-linearity and little normal dispersion value of the present invention is through reducing ground floor airport diameter d
1With the 4th layer of air bore dia d
4Influence effective refractive index, and then influence CHROMATIC DISPERSION IN FIBER OPTICS and chromatic dispersion gradient, can when obtaining little normal dispersion value and smooth chromatic dispersion, have high nonlinear characteristic; Pure quartz material is adopted in said dispersed flat photon crystal fiber substrate with high non-linearity and little normal dispersion value; Through regulating the 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.
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 satisfies d/ Λ=0.82, and corresponding dispersion curve is as shown in Figure 2.Dispersion curve presents following characteristics:
(1) in the wavelength coverage of 1450nm to 1650nm, the dispersion values of photonic crystal fiber between-1.65～-the 0.335ps/nm/km scope in, have color dispersion plainness characteristic;
(2) present parabolic type;
(3) wavelength that maximum dispersion values is corresponding is 1550nm.
Nonlinear factor in the 1550nm wavelength is 33.8W
1Km
-1When the incident wavelength of short-pulse laser is 1550nm, the pulse full width at half maximum is 1.6ps, and is when pump power is 20dBm, 25dBm, 26dBm and 29dBm, through the super continuous spectrums that this long dispersed flat photon crystal fiber transmission back of 80m produces, as shown in Figure 3.When pump power was 29dBm, can produce three dB bandwidth at 1.55 μ m communication bands be the smooth super continuous spectrums of 125nm (1496nm-1621nm), and said three dB bandwidth is the bandwidth of the spectral range during than the little 3dB of peak power (be peak value 50%).
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 satisfies d/ Λ=0.81, and corresponding dispersion curve is as shown in Figure 4.Dispersion curve presents following characteristics:
(1) in the wavelength coverage of 1400nm to 1600nm, the dispersion values of photonic crystal fiber between-11.2～-the 7.8ps/nm/km scope in, have color dispersion plainness characteristic;
(2) present parabolic type;
(3) wavelength that maximum dispersion values is corresponding is 1450nm.
Nonlinear factor in the 1450nm wavelength 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.At first quartzy prefabricated rods is worn into hexagonal configuration, and the center is emptied, in wire-drawer-tower, pull into the hollow kapillary of the about 0.8～2mm of external diameter then; Select quartz pushrod and quartz ampoule accumulation moulding in the ratio of designing requirement size then, add resistant to elevated temperatures filament and it is tightened or be fixed with sleeve pipe; On fiber drawing tower, be drawn at last qualified photonic crystal fiber.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and modification, these improve and modification also should be regarded as protection scope of the present invention.
Claims (7)
1. a dispersed flat photon crystal fiber is characterized in that, the covering of this optical fiber is made up of the airport that multilayer is positioned on the regular hexagon mesh node, 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 the internal layer fibre core is the high index of refraction core district that the disappearance by the airport on the regular hexagon 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.
2. dispersed flat photon crystal fiber as claimed in claim 1 is characterized in that d
4/ Λ and d
1The span of/Λ is 0.38-0.45.
3. dispersed flat photon crystal fiber as claimed in claim 1 is characterized in that, the span of d/ Λ is 0.75-0.82.
4. dispersed flat photon crystal fiber as claimed in claim 1 is characterized in that, said the 4th layer of air pore radius d
4Equal said ground floor airport radius d
1
5. like each described dispersed flat photon crystal fiber among the claim 1-4, it is characterized in that the airport that said multilayer is positioned on the regular hexagon mesh node is positioned at the airport on the regular hexagon mesh node for the 8-10 layer.
6. like each described dispersed flat photon crystal fiber among the claim 1-4, it is characterized in that the said circle that is shaped as that is positioned at airport on the regular hexagon mesh node.
7. like each described dispersed flat photon crystal fiber among the claim 1-4, it is characterized in that the substrate of said optical fiber is a quartz material.
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| CN201010279640.2A CN102401934B (en) | 2010-09-10 | 2010-09-10 | Flattened dispersion photonic crystal optical fiber |
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| CN102401934B CN102401934B (en) | 2014-12-10 |
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Cited By (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 |
| CN103257396A (en) * | 2013-04-16 | 2013-08-21 | 中南民族大学 | Dispersion flatted photonic crystal fiber and dispersion regulation and control method thereof |
| 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 |
| CN106255907A (en) * | 2014-03-25 | 2016-12-21 | Nkt光子学有限公司 | Microstructured optical fibers and super continuum source |
| CN108152881A (en) * | 2018-01-26 | 2018-06-12 | 西安邮电大学 | A kind of sulphur system high double-refraction photon crystal fiber in the range of 2 to 5 micron waveband |
| CN108415121A (en) * | 2018-05-07 | 2018-08-17 | 上海理工大学 | A kind of high birefringence double-core photonic crystal fiber polarization beam apparatus |
| CN114740566A (en) * | 2022-03-11 | 2022-07-12 | 中国科学院西安光学精密机械研究所 | Polymer microstructure optical fiber for terahertz wave high-performance imaging and optical fiber image transmission bundle |
Citations (3)
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|---|---|---|---|---|
| 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 |
-
2010
- 2010-09-10 CN CN201010279640.2A patent/CN102401934B/en not_active Expired - Fee Related
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 |
Cited By (15)
| 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 |
| CN103257396A (en) * | 2013-04-16 | 2013-08-21 | 中南民族大学 | Dispersion flatted photonic crystal fiber and dispersion regulation and control method thereof |
| 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 |
| CN106255907A (en) * | 2014-03-25 | 2016-12-21 | Nkt光子学有限公司 | Microstructured optical fibers and super continuum source |
| US11619778B2 (en) | 2014-03-25 | 2023-04-04 | Nkt Photonics A/S | Source of supercontinuum radiation and microstructured fiber |
| CN110989071B (en) * | 2014-03-25 | 2022-04-08 | Nkt光子学有限公司 | Microstructured optical fiber and supercontinuum light source |
| US10274672B2 (en) | 2014-03-25 | 2019-04-30 | Nkt Photonics A/S | Microstructured fiber and supercontinuum light source |
| CN110989071A (en) * | 2014-03-25 | 2020-04-10 | 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 |
| CN108152881A (en) * | 2018-01-26 | 2018-06-12 | 西安邮电大学 | A kind of sulphur system high double-refraction photon crystal fiber in the range of 2 to 5 micron waveband |
| CN108415121A (en) * | 2018-05-07 | 2018-08-17 | 上海理工大学 | A kind of high birefringence double-core photonic crystal fiber polarization beam apparatus |
| CN108415121B (en) * | 2018-05-07 | 2024-04-16 | 上海理工大学 | High-birefringence double-core photonic crystal fiber polarization beam splitter |
| CN114740566A (en) * | 2022-03-11 | 2022-07-12 | 中国科学院西安光学精密机械研究所 | Polymer microstructure optical fiber for terahertz wave high-performance imaging and optical fiber image transmission bundle |
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| CN102401934B (en) | 2014-12-10 |
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