CN104111493A - High-birefringence flat-dispersion double-core photonic crystal fiber and preparation method thereof - Google Patents
High-birefringence flat-dispersion double-core photonic crystal fiber and preparation method thereof Download PDFInfo
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- CN104111493A CN104111493A CN201410328995.4A CN201410328995A CN104111493A CN 104111493 A CN104111493 A CN 104111493A CN 201410328995 A CN201410328995 A CN 201410328995A CN 104111493 A CN104111493 A CN 104111493A
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Abstract
A high-birefringence flat-dispersion double-core photonic crystal fiber comprises a fiber core and a wrapping layer, the refractive index of the wrapping layer being smaller than that of the fiber core. The background material of the fiber is quartz glass. The wrapping layer of the photonic crystal fiber with the structure above is an air hole dot matrix in regular hexagon arrangement. The fiber core is formed by removing two air holes in the center. A round air hole, with the diameter being d1, carries out separation in the middle. The innermost layer is added with ellipse air holes to destroy the symmetry of the original structure. Twelve round air holes in the wrapping layer are replaced with four ellipse air holes a and two ellipse air holes b, the ellipticity of the ellipse air holes being Eta=m/n, wherein the m is the length of the short axis of the ellipse hole, and n is the length of the long axis of the ellipse hole. The diameter length of the round air hole d of the wrapping layer is d2 and Lambda is the hole spacing. The advantages of the photonic crystal fiber are that the fiber introduces microstructural fiber cores; the modal birefringence performance is higher by an order of magnitude reaching 10<-2> than a common photonic crystal fiber; and the fiber is excellent in performance and easy to produce and is suitable for making polarization beam splitters.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, particularly smooth dispersion double-core photonic crystal fiber of a kind of high birefringence and preparation method thereof.
Background technology
The photonic crystal fiber microstructured optical fibers that is otherwise known as, it is a kind of defective two-dimensional fundamental form of being with, and its xsect has the microstructure airport of periodic arrangement, and background material is quartz glass, by small airport, light is retrained, and realizes the conduction of light.
Compare traditional fiber, photonic crystal fiber has a lot of characteristics: as unimodular property, low loss characteristic without cut-off, dispersion characteristics etc. flexibly.According to the difference of core material, photonic crystal fiber can be divided into refractive index light-conducting type and band gap leading type.And by changing the geometric parameters such as radius, pitch of holes of photonic crystal fiber airport, can change neatly the transport property of photonic crystal fiber.
The birefringence of pattern is the important parameter of weighing polarization maintaining optical fibre performance, it is produced by the poor difference of effective refractive index on two polarization directions of optical fiber basic mode, thereby the refringence that increases the two can increase rapidly birefringence, guarantor's bias energy of raising optical fiber effectively.
High double-refraction photon crystal fiber is widely used in the manufacture of laser instrument and other optical precision instruments.The high double-refraction photon crystal fiber of having reported at present is mainly divided into following a few class: 1) near fibre core, introduce local asymmetry; 2) there is anisotropic covering; 3) at clad doped polymkeric substance etc.; 4) there is microstructure fibre core.
To design and produce the document with high double-refraction photon crystal fiber be that the 25th 18 phase of volume of optics letter in 2000 1325-1327 page is delivered " high double-refraction photon crystal fiber " to report the earliest, referring to: Ortigosa B A, Knight J C, Wadsworth W J et.al. Highly birefringence photonic crystal fiber [J]. Optics Letter, 2000,25 (18): 1325-1327.In literary composition, reported that birefringence reaches 3.7 * 10
-3quartzy double refraction photo crystal optical fiber.2009, pay a kind of high birefringence double-core photonic crystal fiber of rich design, by adjusting the parameter of aperture and pitch of holes, can effectively optimize optical fiber property.2012, the fibre core that it is elliptical aperture structure that Li Dan proposes at internal layer covering was introduced four little elliptical apertures, and by optimizing the structural parameters of optical fiber, birefringence degree reaches 0.92 * 10
-3, dispersion values variation range is 14 ps/ (kmnm), but its coupling length is longer.
Current, photonic crystal fiber based on new construction has caused very big research interest, design there is high birefringence simultaneously, coupling length is short and the photonic crystal fiber of smooth dispersion characteristics becomes focus, it has the important value that is applied to make polarization beam apparatus and produces broadband super continuous spectrums.
Summary of the invention
The object of the invention is to solve the problems such as the lower while coupling length of current existing photonic crystal fiber birefringence is large, dispersion flattene degree is lower, the smooth dispersion double-core photonic crystal fiber of high birefringence that a kind of structure is relatively simple and be easy to make is provided, this photonic crystal fiber has adopted hexagon covering and has introduced fibre core microstructure, has the birefringence higher than existing photonic crystal fiber; The background material adopting is quartz glass, and optical fiber has the smooth dispersion in less coupling length and broadband, thereby can be as making polarization beam apparatus and super continuous spectrums microstructured optical fibers.
Technical scheme of the present invention:
The smooth dispersion double-core photonic crystal fiber of high birefringence, comprises fibre core and covering, and cladding index is lower than fibre core; The clad material of optical fiber is quartz glass, and this photonic crystal fiber covering is the airport lattice structure that regular hexagon is arranged, and fibre core Shi You removes at center two airports and forms, and centre is d by a diameter
1central circular airport keep apart, at innermost layer, be provided with oval airport to destroy the symmetry of original structure, 12 airports originally change four oval airport a and 2 oval airport b into, the ovality computing formula of elliptical aperture is η=m/n, in formula: the minor axis length that m is elliptical aperture, the long axis length that n is elliptical aperture; Clad material is quartz glass, and the diameter length of the circular airport of covering is d
2, Λ is pitch of holes.
The major diameter of described elliptical aperture a is that 4 μ m, minor axis diameter are 1.68 μ m; The major diameter of elliptical aperture b is that 2.56 μ m, minor axis diameter are 1.075 μ m; The diameter of central circular airport is 1.0 μ m; The refractive index of quartz glass covering is 1.444, and the diameter of the circular airport of covering is 1.1 μ m, and spacing is 2.0 μ m.
A preparation method for the smooth dispersion double-core photonic crystal fiber of described high birefringence, step is as follows:
1) 7 hollow capillary quartz ampoules are lined up to hexagon, bundle, by sexangle one, enclose outwards binding, until be bundled into layer 5, put again outer tube, then at the gap location of hollow capillary quartz ampoule, with stuffed quartz capillary rod, fill, 13 of center hollow capillary quartz ampoules are taken out, change a unidimensional stuffed quartz rod into and replace, when extracting central hollow quartz ampoule, center pit is supported, prevent that kapillary caves in towards periphery around, make preform;
2) above-mentioned preform is fixed in wire-drawer-tower, regulate wire-drawing temperature T=2070 ℃ and drawing speed 20m/min, prefabricated rods carried out in heating furnace to heating and melting and draw after melting, after fiber size remains unchanged, making naked photonic crystal fiber;
3) by ultrasonic drilling method, above-mentioned naked photonic crystal fiber is punched;
4) the naked photonic crystal fiber after above-mentioned punching is carried out to gluing, then with ultraviolet ray, irradiate, make gluing evenly be set in optical fiber surface, can make the smooth dispersion double-core photonic crystal fiber of high birefringence.
An application for described high birefringence double-core photonic crystal fiber, for making polarization beam apparatus and super continuous spectrums microstructured optical fibers.
Advantage of the present invention and beneficial effect:
The present invention proposes the smooth dispersion double-core photonic crystal fiber of high birefringence that a kind of structure is relatively simple and be easy to make, by introducing fibre core microstructure, at two fibre cores, locate to be respectively provided with the structure of three oval airports around, this structural table reveals very high mode birefringence; The mode birefringence of this photonic crystal fiber is than common double-core photonic crystal fiber (10
-3magnitude) exceed an order of magnitude, reach 10
-2magnitude, this optical fiber is when transmission wavelength is 1800nm simultaneously, x polarization direction coupling length is 101.59
, y polarization direction is 112.342
; The smooth dispersion characteristics with broadband.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of this photonic crystal fiber.
In figure: 1. elliptical aperture a 2. elliptical aperture b 3. central circular airports
4. circular airport 5. covering 6. fibre cores of covering
Fig. 2 is the poor of mode refractive index on two polarization directions of this photonic crystal fiber that calculate, i.e. birefringence is with the variation relation figure of wavelength.
Fig. 3 is that this photonic crystal fiber coupling length of calculating is with the variation relation figure of transmission wavelength.
Fig. 4 be on this photonic crystal fiber Y polarization direction calculating dispersion with the variation relation figure of transmission wavelength.
Embodiment
embodiment:
The smooth dispersion double-core photonic crystal fiber of high birefringence, as shown in Figure 1, comprises fibre core 6 and covering 5, and covering 5 refractive indexes are lower than fibre core 6; The clad material of optical fiber is quartz glass, and this photonic crystal fiber covering is the airport lattice structure that regular hexagon is arranged, and fibre core 6 removes two airports by center and forms, and centre is d by a diameter
1central circular airport 3 keep apart, at innermost layer, be provided with oval airport to destroy the symmetry of original structure, 12 airports originally change four oval airport a1 and 2 oval airport b2 into, the ovality computing formula of elliptical aperture is η=m/n, in formula: the minor axis length that m is elliptical aperture, the long axis length that n is elliptical aperture; Clad material is quartz glass, and the diameter length of the circular airport of covering is d
2, Λ is pitch of holes.
In this embodiment, the major diameter of elliptical aperture a is that 4 μ m, minor axis diameter are 1.68 μ m; The major diameter of elliptical aperture b is that 2.56 μ m, minor axis diameter are 1.075 μ m; The diameter of central circular airport is 1.0 μ m; The refractive index of quartz glass covering is 1.444, and the diameter of circular airport is 1.1 μ m, and spacing is 2.0 μ m.
The preparation method of the smooth dispersion double-core photonic crystal fiber of this high birefringence, step is as follows:
1) 7 hollow capillary quartz ampoules are lined up to hexagon, bundle, by sexangle one, enclose outwards binding, until be bundled into layer 5, put again outer tube, then at the gap location of hollow capillary quartz ampoule, with stuffed quartz capillary rod, fill, 13 of center hollow capillary quartz ampoules are taken out, change a unidimensional stuffed quartz rod into and replace, when extracting central hollow quartz ampoule, center pit is supported, prevent that kapillary caves in towards periphery around, so just formed preform;
2) above-mentioned prefabricated rods is fixed in wire-drawer-tower, regulate wire-drawing temperature T=2070 ℃ and drawing speed 20m/min, then prefabricated rods is carried out heating and melting in heating furnace, in melting by traction, after fiber size remains unchanged, formed naked photonic crystal fiber;
3) by ultrasonic drilling method, fibre core is punched, complete the design of fibre core;
4) to the bare fibre gluing of entering, with ultraviolet ray, irradiate, make gluing evenly be set in optical fiber surface.
The application of prepared high birefringence double-core photonic crystal fiber, as making polarization beam apparatus and super continuous spectrums microstructured optical fibers.
Mode refractive index on two polarization directions that Fig. 2 calculates for this photonic crystal fiber poor, be that birefringence is with the variation relation figure of wavelength, in figure, show: mode birefringence increases along with the increase of transmission wavelength, when transmission wavelength is 1800nm, its birefringence degree reaches 1.16 * 10
-2, than common photonic crystal fiber, exceed an order of magnitude.
The coupling length that Fig. 3 calculates for this photonic crystal fiber, with the variation relation figure of wavelength, shows in figure: the coupling length of this photonic crystal fiber is very low, and at 1550nm place, x polarization direction coupling length is 151.23 μ m, and y polarization direction is 187.812 μ m.
Fig. 4 be this Dispersion Properties of Photonic Crystal Fibers with the variation relation figure of wavelength, in figure, show: this photonic crystal fiber has the smooth dispersion characteristics in broadband, its dispersion values is that variation range between 1000nm～1600nm is 12ps/ (kmnm) at transmission wavelength.
Claims (4)
1. the smooth dispersion double-core photonic crystal fiber of high birefringence, is characterized in that: comprise fibre core and covering, cladding index is lower than fibre core; The clad material of optical fiber is quartz glass, and this photonic crystal fiber covering is the airport lattice structure that regular hexagon is arranged, and fibre core Shi You removes at center two airports and forms, and centre is d by a diameter
1circular airport c keep apart, at innermost layer, be provided with oval airport to destroy the symmetry of original structure, 12 airports originally change four oval airport a and 2 oval airport b into, the ovality computing formula of elliptical aperture is η=m/n, in formula: the minor axis length that m is elliptical aperture, the long axis length that n is elliptical aperture; Clad material is quartz glass, and the diameter length of the circular airport d of covering is d
2, Λ is pitch of holes.
2. the smooth dispersion double-core photonic crystal fiber of high birefringence according to claim 1, is characterized in that: the major diameter of described elliptical aperture a is that 4 μ m, minor axis diameter are 1.68 μ m; The major diameter of elliptical aperture b is that 2.56 μ m, minor axis diameter are 1.075 μ m; The diameter of central circular airport c is 1.0 μ m; The refractive index of quartz glass covering is 1.444, and the diameter of circular airport d is 1.1 μ m, and spacing is 2.0 μ m.
3. a preparation method for the smooth dispersion double-core photonic crystal fiber of high birefringence as claimed in claim 1, is characterized in that step is as follows:
1) 7 hollow capillary quartz ampoules are lined up to hexagon, bundle, by sexangle one, enclose outwards binding, until be bundled into layer 5, put again outer tube, then at the gap location of hollow capillary quartz ampoule, with stuffed quartz capillary rod, fill, 13 of center hollow capillary quartz ampoules are taken out, change a unidimensional stuffed quartz rod into and replace, when extracting central hollow quartz ampoule, center pit is supported, prevent that kapillary caves in towards periphery around, make preform;
2) above-mentioned preform is fixed in wire-drawer-tower, regulate wire-drawing temperature T=2070 ℃ and drawing speed 20m/min, prefabricated rods carried out in heating furnace to heating and melting and draw after melting, after fiber size remains unchanged, making naked photonic crystal fiber;
3) by ultrasonic drilling method, above-mentioned naked photonic crystal fiber is punched;
4) the naked photonic crystal fiber after above-mentioned punching is carried out to gluing, then with ultraviolet ray, irradiate, make gluing evenly be set in optical fiber surface, can make the smooth dispersion double-core photonic crystal fiber of high birefringence.
4. an application for high birefringence double-core photonic crystal fiber as claimed in claim 1, is characterized in that: for making polarization beam apparatus and super continuous spectrums microstructured optical fibers.
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| CN104536084A (en) * | 2014-12-29 | 2015-04-22 | 华中科技大学 | Photonic crystal fiber polarizer |
| CN104880765A (en) * | 2015-06-26 | 2015-09-02 | 深圳市通盛新材料有限公司 | Double-core polarization-maintaining photonic crystal optical fiber |
| CN104991305A (en) * | 2015-07-14 | 2015-10-21 | 燕山大学 | Oval high-birefringence soft glass photonic crystal fiber |
| CN106054311A (en) * | 2016-08-15 | 2016-10-26 | 中国工程物理研究院激光聚变研究中心 | High-birefringence composite pohotonic crystal fiber |
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| CN104536084A (en) * | 2014-12-29 | 2015-04-22 | 华中科技大学 | Photonic crystal fiber polarizer |
| CN104880765A (en) * | 2015-06-26 | 2015-09-02 | 深圳市通盛新材料有限公司 | Double-core polarization-maintaining photonic crystal optical fiber |
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| CN104991305A (en) * | 2015-07-14 | 2015-10-21 | 燕山大学 | Oval high-birefringence soft glass photonic crystal fiber |
| CN106054311B (en) * | 2016-08-15 | 2023-08-22 | 中国工程物理研究院激光聚变研究中心 | High-birefringence composite photonic crystal fiber |
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| 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 |
| 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 |
| CN108594360A (en) * | 2018-06-22 | 2018-09-28 | 宝鸡文理学院 | A kind of double-core photonic crystal fiber of liquid filling body |
| CN108594360B (en) * | 2018-06-22 | 2023-11-24 | 宝鸡文理学院 | Liquid-filled double-core photonic crystal fiber |
| CN109298481A (en) * | 2018-10-09 | 2019-02-01 | 东北大学 | The metallic silver filling photonic crystal fiber and its preparation method of spontaneous generation SPR effect |
| CN109324370A (en) * | 2018-12-10 | 2019-02-12 | 四川航天系统工程研究所 | A kind of photonic crystal optical fiber coupler |
| CN109932777A (en) * | 2018-12-12 | 2019-06-25 | 西南科技大学 | A kind of high sensitivity pressure sensing photonic crystal fiber and its pressure sensor |
| CN109655430A (en) * | 2019-02-21 | 2019-04-19 | 南京邮电大学 | A kind of spiral microstructured optical fibers index sensor based on SPR effect |
| CN112363269A (en) * | 2020-12-11 | 2021-02-12 | 东北石油大学 | High-birefringence low-limiting-loss photonic quasicrystal optical fiber |
| CN113189697A (en) * | 2021-05-10 | 2021-07-30 | 东北大学 | Chalcogenide high-birefringence decagonal photonic crystal fiber |
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