CN104991305A - Oval high-birefringence soft glass photonic crystal fiber - Google Patents
Oval high-birefringence soft glass photonic crystal fiber Download PDFInfo
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- CN104991305A CN104991305A CN201510411398.2A CN201510411398A CN104991305A CN 104991305 A CN104991305 A CN 104991305A CN 201510411398 A CN201510411398 A CN 201510411398A CN 104991305 A CN104991305 A CN 104991305A
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- fiber
- photonic crystal
- optical fiber
- soft glass
- crystal fiber
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02333—Core having higher refractive index than cladding, e.g. solid core, effective index guiding
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention relates to an oval high-birefringence soft glass photonic crystal fiber. The fiber comprises a fiber background material. A cross section structure of the fiber comprises a fiber core and a wrapping layer, wherein the wrapping layer is formed by circular air hole channels which are distributed in the fiber background material regularly and extend to the axial direction of the fiber, and the fiber background material among the circular air hole channels; the fiber core is located in a center area of the cross section structure of the fiber; the wrapping layer is arranged at the peripheral area of the fiber core; and the refractive index of the wrapping layer is lower than the refractive index of the fiber core. The oval high-birefringence soft glass photonic crystal fiber is characterized in that the circular air hole channels forming the wrapping layer are distributed around the fiber core radioactively in an oval contour manner, and the projections of the circular air hole channels on the cross section of the fiber are circular air holes respectively. The oval high-birefringence soft glass photonic crystal fiber has the advantages of improving distribution mode of the air hole channels in the fiber wrapping layer, enhancing asymmetry of the structure and enabling the fiber to have a high birefringence effect. Meanwhile, the photonic crystal fiber is easy to prepare and low in loss.
Description
Technical field
The present invention relates to a kind of oval high birefringence soft glass photonic crystal fiber, belong to technical field of optical fiber.
Background technology
In the ideal case, the basic mode light field of single-mode fiber transmission is made up of two mutually orthogonal linear polarization mode fields, and they have identical propagation constant, mutual degeneracy.But, the xsect of actual fiber is not perfect circle, and inside of optical fibre also has residual stress, or the interference being subject to other extraneous factor all can make the propagation constant of two of fundamental mode field in optical fiber polarized components change, destroy the degeneracy characteristic of fundamental mode field, thus make the polarization state of basic mode light field in transmitting procedure that random random change occur.Polarization maintaining optical fibre introduces asymmetry in the structure of optical fiber, and the propagation constant difference of basic mode two polarization states is increased, thus reduces its degree of coupling, then the polarization state of fundamental mode field can be kept.
Photonic crystal fiber has the structure design characteristic of high flexible, by introducing stronger asymmetry to effective control of the structural parameters such as aperture, hole shape, pore size distribution mode, thus can produce high birefringence.The structural design of traditional high birefringence optical fiber is more single, manufacture craft more complicated, job stability are poor and birefringence level also has much room for improvement, photonic crystal fiber because structural design is versatile and flexible, manufacturing technology is day by day perfect, possess many-sided superior function and be widely used in fields such as polarization maintaining optical fibre, optical fibre gyro, wavelength division multiplexer, fiber amplifiers.By contrast, high double-refraction photon crystal fiber has the incomparable superiority of traditional polarization maintaining optical fibre in fields such as optical communication, light sensings.
Summary of the invention
The object of the invention is to overcome traditional polarization maintaining optical fibre manufacture craft more complicated, birefringence is lower and job stability is poor shortcoming, providing that a kind of novel structure is simple, function admirable, be easy to the oval high birefringence soft glass photonic crystal fiber prepared.
The technical scheme that the present invention takes is as follows:
A kind of oval high birefringence soft glass photonic crystal fiber, optical fiber comprises optical fiber background material, the cross-sectional structure of optical fiber comprises fibre core and covering, covering is by regular distribution in optical fiber background material, form along the optical fiber background material between the axially extended circular air channels of optical fiber and circular air channels, fibre core is positioned at the central area of the cross-sectional structure of optical fiber, covering is arranged on fibre core outer peripheral areas, fibre core surrounds by the airport arranged with cartouche the high index of refraction core district be made up of optical fiber background material formed, the refractive index of covering lower than refractive index, the circular air channels formed in covering is arranging on the cartouche in increased radioactivity of fibre core, circular air channels is projected as circular airport on the xsect of optical fiber, on same cartouche, the center of adjacent two airports is identical with the angle of the line at cross section of optic fibre center, and namely often enclosing airport is distribute in the mode of even angle.
Described air channels is arranged in parallel along shaft axis of optic fibre;
The ratio of semi-minor axis length often enclosing the ellipse of airport distribution is all 4:3;
On photonic crystal fiber end face, described airport radially can amplify under the condition not affecting adjacent vacant pore on original position, and the aperture of the round airport in same circle is all identical;
The cross-sectional structure of described optical fiber is from inside to outside divided into and is furnished with 6 circle airports;
Airport on the cross-sectional structure of described photonic crystal fiber is centrosymmetric formal distribution, from inside to outside has four kinds of air apertures, is respectively d
1, d
2, d
3, d
4, and d
1< d
2< d
3< d
4;
The background material of described optical fiber structure is soft glass SF6 or polymeric material.
Beneficial effect of the present invention is embodied in: the distribution mode improving air channels in fibre cladding, only adopts circular air channels can strengthen the asymmetry of structure, makes optical fiber have high birefringence effect.Meanwhile, the Design of Photonic Crystal Fiber of proposition has easily preparation and low-loss advantage.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of optical fiber in the embodiment of the present invention one.In Fig. 1, outside dotted line is the outline line of optical fiber structure, and 1 is optical fiber background material, and 2 is fibre cores, and 3,4,5,6 is circular airports of different pore size.
Fig. 2 is the relation between the birefringence of photonic crystal fiber when the covering airport number of turns is different in Fig. 1 example and wavelength.
Fig. 3 is the relation between the limitation loss of photonic crystal fiber when the covering airport number of turns is different in Fig. 1 example and wavelength.
Embodiment
Below by embodiment, the present invention is described further, but protection scope of the present invention is not limited to this.
Embodiment one
With reference to Fig. 1, a kind of oval high double-refraction photon crystal fiber, the axis along optical fiber arranges many air channels regularly, and described air channels is arranged in parallel along shaft axis of optic fibre, and as shown in Figure 1, optical fiber background material 1 is soft glass SF6, and refractive index is 1.76.
Described cross section of optic fibre comprises fibre core 2 and covering, and fibre core surrounds by the airport arranged with cartouche the oval high index of refraction core district be made up of optical fiber background material formed.
The covering of described optical fiber is that aperture is d by arranging from inside to outside in cartouche in optical fiber background material 1
1the circular airport 3 of first lap, aperture be d
2the second circle circular airport 4, aperture be d
3the third and fourth circle circular airport 5, aperture be d
4the circular airport 6 of the 5th and the 6th circle, and the equivalent region of low refractive index that the optical fiber background material between circular air channels is formed jointly, the ratio of semi-minor axis length of the ellipse that airport is arranged in is 4:3, is positioned at fibre core 2 around.
The circular airport of six circles in the covering of described optical fiber is formed, pore radius is followed successively by 0.2 μm, 0.4 μm, 0.5 μm, 0.5 μm, 0.6 μm, 0.6 μm from inside to outside, described round airport radially can amplify under the condition not affecting adjacent vacant pore on original position, and the aperture of same circle circle airport is all identical.In same circle airport, the center in adjacent two holes is identical with the angle of cross-section center line, and namely airport distributes in the mode of even angle.Oval ratio of semi-minor axis length can regulate, and the optical fiber background material forming fibre core is identical with the optical fiber background material in covering, is soft glass SF6.
Fig. 2 result shows, described optical fiber structure has very strong birefringent characteristic, can reach 1.6 × 10 in the birefringence at 1.55 mum wavelength places
-3, an order of magnitude higher than the birefringence of common polarization maintaining optical fibre.Meanwhile, the structure that five circles and six circle airports are formed has almost identical birefringence effect, also illustrate that described optical fiber can produce high birefringence effect with better simply structure.
Fig. 3 result shows that this structure has very low limitation loss, can reach 10 at the limitation loss of 1.55 mum wavelength place basic modes, two polarization states
-8below dB/km.
Embodiment two
A kind of oval high double-refraction photon crystal fiber, the airport in cross section of optic fibre is arranged in cartouche, and the background material of optical fiber is polymeric material, other structure and data parameters identical with embodiment one.
Claims (9)
1. an oval high birefringence soft glass photonic crystal fiber, described optical fiber comprises optical fiber background material, the cross-sectional structure of optical fiber comprises fibre core and covering, covering is by regular distribution in optical fiber background material, form along the optical fiber background material between the axially extended circular air channels of optical fiber and circular air channels, fibre core is positioned at the central area of the cross-sectional structure of optical fiber, covering is arranged on fibre core outer peripheral areas, the refractive index of covering lower than refractive index, it is characterized in that: the circular air channels formed in covering is arranging on the cartouche in increased radioactivity of fibre core, circular air channels is projected as circular airport on the xsect of optical fiber.
2. oval high birefringence soft glass photonic crystal fiber according to claim 1, is characterized in that: fibre core surrounds by the airport arranged with cartouche the high index of refraction core district be made up of optical fiber background material formed.
3. oval high birefringence soft glass photonic crystal fiber according to claim 1, is characterized in that: described air channels is arranged in parallel along shaft axis of optic fibre.
4. oval high birefringence soft glass photonic crystal fiber according to claim 1, is characterized in that: the airport on the cross-sectional structure of described photonic crystal fiber is centrosymmetric formal distribution, from inside to outside has four kinds of air apertures, is respectively d
1, d
2, d
3, d
4, and d
1< d
2< d
3< d
4.
5. oval high birefringence soft glass photonic crystal fiber according to claim 1, is characterized in that: on same cartouche, the center of adjacent two airports is identical with the angle of the line at cross section of optic fibre center.
6. oval high birefringence soft glass photonic crystal fiber according to claim 1, is characterized in that: the ratio of semi-minor axis length often enclosing the ellipse of airport distribution is all 4:3.
7. oval high birefringence soft glass photonic crystal fiber according to claim 1, it is characterized in that: on photonic crystal fiber end face, described airport radially can amplify under the condition not affecting adjacent vacant pore on original position, and the aperture of the round airport in same circle is all identical.
8. oval high birefringence soft glass photonic crystal fiber according to claim 1, is characterized in that: the background material of described optical fiber structure is soft glass SF6 or polymeric material.
9. oval high birefringence soft glass photonic crystal fiber according to claim 4, is characterized in that: be from inside to outside divided on the cross-sectional structure of described optical fiber and be furnished with 6 circle airports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510411398.2A CN104991305A (en) | 2015-07-14 | 2015-07-14 | Oval high-birefringence soft glass photonic crystal fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510411398.2A CN104991305A (en) | 2015-07-14 | 2015-07-14 | Oval high-birefringence soft glass photonic crystal fiber |
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| CN104991305A true CN104991305A (en) | 2015-10-21 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784196A (en) * | 2016-05-20 | 2016-07-20 | 中国电子科技集团公司第四十九研究所 | Reflection type temperature sensing probe based on double-layered photonic crystal thin film |
| 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 |
| CN106199826A (en) * | 2016-08-03 | 2016-12-07 | 清华大学 | Polarization maintaining optical fibre |
| CN107526129A (en) * | 2016-06-15 | 2017-12-29 | 国立研究开发法人产业技术综合研究所 | Light irradiation device and the fiber path for the light irradiation device |
| CN110794511A (en) * | 2019-11-15 | 2020-02-14 | 燕山大学 | Polarization-maintaining dispersion compensation microstructure optical fiber |
| CN111025455A (en) * | 2019-12-27 | 2020-04-17 | 天津工业大学 | Photonic crystal fiber with elliptical spiral elliptical hole structure |
| CN113031147A (en) * | 2021-03-15 | 2021-06-25 | 南京邮电大学 | Homogenization optical fiber with multilayer square structure |
| CN113655561A (en) * | 2020-05-12 | 2021-11-16 | 华北电力大学（保定） | High-birefringence low-limiting-loss photonic crystal fiber |
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| US20110194826A1 (en) * | 2009-07-17 | 2011-08-11 | Sumitomo Electric Industries, Ltd. | Photonic crystal fiber |
| CN102279439A (en) * | 2011-07-26 | 2011-12-14 | 重庆大学 | Hybrid light-guiding type single-polarization single-mode optical fiber |
| CN104111493A (en) * | 2014-07-11 | 2014-10-22 | 天津理工大学 | High-birefringence flat-dispersion double-core photonic crystal fiber and preparation method thereof |
| CN104166179A (en) * | 2014-07-21 | 2014-11-26 | 南京邮电大学 | High-birefringence photonic crystal fiber |
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2015
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| US20110194826A1 (en) * | 2009-07-17 | 2011-08-11 | Sumitomo Electric Industries, Ltd. | Photonic crystal fiber |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784196A (en) * | 2016-05-20 | 2016-07-20 | 中国电子科技集团公司第四十九研究所 | Reflection type temperature sensing probe based on double-layered photonic crystal thin film |
| CN105784196B (en) * | 2016-05-20 | 2018-07-13 | 中国电子科技集团公司第四十九研究所 | Reflective temperature sensing probe based on the double-deck photon crystal film |
| CN107526129A (en) * | 2016-06-15 | 2017-12-29 | 国立研究开发法人产业技术综合研究所 | Light irradiation device and the fiber path for the light irradiation device |
| 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 |
| CN106199826A (en) * | 2016-08-03 | 2016-12-07 | 清华大学 | Polarization maintaining optical fibre |
| CN106199826B (en) * | 2016-08-03 | 2019-04-23 | 清华大学 | Polarization-maintaining annular core fibre |
| CN110794511A (en) * | 2019-11-15 | 2020-02-14 | 燕山大学 | Polarization-maintaining dispersion compensation microstructure optical fiber |
| CN111025455A (en) * | 2019-12-27 | 2020-04-17 | 天津工业大学 | Photonic crystal fiber with elliptical spiral elliptical hole structure |
| CN113655561A (en) * | 2020-05-12 | 2021-11-16 | 华北电力大学（保定） | High-birefringence low-limiting-loss photonic crystal fiber |
| CN113031147A (en) * | 2021-03-15 | 2021-06-25 | 南京邮电大学 | Homogenization optical fiber with multilayer square structure |
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