CN105116486A - Octagonal photonic crystal optical-fiber polarization beam splitter - Google Patents
Octagonal photonic crystal optical-fiber polarization beam splitter Download PDFInfo
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- CN105116486A CN105116486A CN201510628544.7A CN201510628544A CN105116486A CN 105116486 A CN105116486 A CN 105116486A CN 201510628544 A CN201510628544 A CN 201510628544A CN 105116486 A CN105116486 A CN 105116486A
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- photonic crystal
- polarization beam
- airport
- octagon
- beam splitter
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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
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
-
- 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
- G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding
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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 octagonal photonic crystal optical-fiber polarization beam splitter. The octagonal photonic crystal optical-fiber polarization beam splitter comprises two fiber cores which are distributed in a central symmetry manner and a cladding layer, wherein the cladding layer is formed by circular air holes and a background material, the cladding layer is arranged in a peripheral area of the fiber cores, and the refractive index of the cladding layer is lower than that of the fiber core part; the circular air holes forming the cladding layer are distributed in an octagonal shape surrounding the fiber cores, an elliptical air hole is formed between the two fiber cores, and on the end surface of the photonic crystal optical-fiber polarization beam splitter, all the circular air holes are identical in bore diameters. The octagonal photonic crystal optical-fiber polarization beam splitter has the advantages that the distribution way of the air holes in the optical-fiber cladding layer is improved, so that the asymmetry of the structure is improved, and the optical fibers have high double refractive effect. Meanwhile, the photonic crystal optical-fiber polarization beam splitter has the advantages of high extinction ratio, large bandwidth and the like.
Description
Technical field
The invention belongs to optical device field, relate to a kind of two core light photonic crystal fiber polarization beam apparatus of octagon with high birefringence.
Background technology
According to mode coupling theory, when light wave incides in a fibre core of double-core photonic crystal fiber, fundamental mode field can be inspired wherein, and the fundamental mode field of this fibre core will inevitably partly expand in covering due to the design feature of optical fiber, thus entering into adjacent another very near fibre core, this part luminous energy just becomes the driving source of another fibre core and inspires transmission mode wherein.Like this, the mode field in two fibre cores just can intercouple, and the fundamental mode field in result twin-core structure is just made up of four polarized components, i.e. the strange mould of X polarization and even mould, and the strange mould of Y polarization and even mould, can be expressed as:
with
wherein, E represents electric field, and subscript represents strange mould or even mould, and subscript represents X polarization state or Y polarization state.
When coupling length refers to that the energy of light wave is coupled to another fibre core completely from a fibre core, light wave is along the distance of spread fiber, by introducing high birefringence in a fiber, can to increase the coupling length of basic mode X polarization state and Y polarization state poor, is conducive to the abundant separation of two polarization state light fields.Photonic crystal fiber has the structure design characteristic of high flexible, by introducing 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 fiber optic splitter is more single, manufacture craft more complicated and serviceability also have 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 polarization beam apparatus field.By contrast, the polarization beam apparatus based on photonic crystal fiber has the significantly advantage such as high birefringence, High Extinction Ratio and larger bandwidth of operation.
Summary of the invention
The object of the invention is to overcome traditional fiber optic splitter manufacture craft more complicated, birefringence is lower and serviceability is not high shortcoming, providing that a kind of novel structure is simple, octagon double-core photonic crystal fiber polarization beam apparatus that function admirable and being easy to makes.
The technical scheme that the present invention takes is as follows:
A kind of octagon photonic crystal fiber polarization beam apparatus, comprise two fibre core and the covering of Central Symmetry distribution, covering is made up of circular airport and background material, and described covering is arranged on fibre core outer peripheral areas, and its refractive index is lower than core segment; The circular airport forming covering is octagonal array around fibre core, and be an oval airport between two fibre cores, on described photonic crystal fiber polarization beam apparatus end face, the aperture of all round airports is all identical.
Each round airport in described covering radially can amplify under the condition not affecting adjacent vacant pore on original position.
Described two fibre cores are the high-refractive-index regions being replaced by two adjacent with oval airport left and right in cladding structure round airport silex glasss being formed.
On described beam splitter end face, an oval airport is positioned at the center of structure, its long axis cross direction profiles, and the ratio of semi-minor axis length of elliptical aperture can regulate; The ratio Λ of airport spacing in covering
x/ Λ
ycan regulate with air aperture.
In described beam splitter end face structure, covering airport is that the mode that combines of octagon and rectangle distributes, and innermost layer airport is with rectangular arranged, and remaining each layer of air hole is arranged in octagon.
The cladding background material of described beam splitter structure can be silica glass, soft glass material or polymeric material.
Beneficial effect of the present invention is embodied in: the distribution mode improving airport in fibre cladding, enhances the asymmetry of structure, makes optical fiber have high birefringence effect.Meanwhile, the photonic crystal fiber polarization beam apparatus of proposition has the advantage such as High Extinction Ratio, larger bandwidth.
Accompanying drawing explanation
Fig. 1 is the beam splitter cross sectional representation of the embodiment of the present invention one.In Fig. 1,1 is background material, and 2 is circle airports, and 3 is fibre cores, and 4 is oval airports.
Fig. 2 is the normalization through-put power of photonic crystal fiber polarization beam apparatus in Fig. 1 example and the graph of a relation of transmission range.
Fig. 3 is the birefringence of photonic crystal fiber polarization beam apparatus in Fig. 1 example and the graph of a relation of hole longitudinal pitch.
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 octagon photonic crystal fiber polarization beam apparatus, the axis along optical fiber arranges many airports regularly, described airport is arranged in parallel along shaft axis of optic fibre, and xsect is eight-sided formation, as shown in Figure 1, background material 1 is silex glass, and refractive index is 1.45.
Described beam splitter xsect comprises two fibre core 3 and covering, and two fibre core 3 is the high index of refraction core districts formed by the disappearance of two that are centrally located on regular grid node round airports 2, and the dotted portion in the middle part of Fig. 1 represents the approximate range of fibre core.
The covering of described beam splitter arranges by the airport 2 on the regular grid node of background material 1 the equivalent region of low refractive index formed, and the octagon distribution of airport in rule, is positioned at fibre core 3 around.
Described covering is made up of the circular hole pore 2 and background material 1 with same apertures d, and airport 2 is arranged with four layers in the mode that rectangle and octagon combine, and innermost layer airport is with rectangular arranged, and remaining three layer of air hole is arranged in octagon.The horizontal and vertical spacing at adjacent vacant pore center is respectively Λ
xand Λ
y, the cross-section center of beam splitter is an oval airport 4.
Diameter d=1.1 μm of each airport 2 in covering, pitch of holes is Λ
x=1.2 μm, Λ
y=1.7 μm, the oval airport major and minor axis at center is respectively 1.6 μm and 1.1 μm, and the major and minor axis of covering air aperture and center elliptical aperture can regulate.Region in the xsect of beam splitter except airport is all made up of silica glass material.
Fig. 2 result shows, this polarization beam apparatus has the effect being well separated basic mode two polarization state light fields, two of a basic mode linearlypolarized laser can be separated completely, reach higher extinction ratio when length is 314 μm.
Fig. 3 result shows that this structure has very strong asymmetry, can reach 10 by adjustment structure parameter at 1.55 mum wavelength places
-3the birefringence of magnitude, a magnitude higher than the birefringence of common polarization maintaining optical fibre, has the ability of stronger maintenance polarization state.
Embodiment two
A kind of octagon photonic crystal fiber polarization beam apparatus, the xsect of beam splitter is octagon, covering airport is that the mode that combines of octagon and rectangle distributes, and the background material of beam splitter is polymkeric substance or soft glass material, other structure and data parameters identical with embodiment one.
Claims (6)
1. an octagon photonic crystal fiber polarization beam apparatus, comprise two fibre core and the covering of Central Symmetry distribution, it is characterized in that: covering is made up of circular airport and background material, described covering is arranged on fibre core outer peripheral areas, and its refractive index is lower than core segment; The circular airport forming covering is octagonal array around fibre core, and be an oval airport between two fibre cores, on described photonic crystal fiber polarization beam apparatus end face, the aperture of all round airports is all identical.
2. octagon photonic crystal fiber polarization beam apparatus according to claim 1, is characterized in that: each round airport in described covering radially can amplify under the condition not affecting adjacent vacant pore on original position.
3. octagon photonic crystal fiber polarization beam apparatus according to claim 1, is characterized in that: described two fibre cores are the high-refractive-index regions being replaced by two adjacent with oval airport left and right in cladding structure round airport silex glasss being formed.
4. octagon photonic crystal fiber polarization beam apparatus according to claim 1, it is characterized in that: on described beam splitter end face, an oval airport is positioned at the center of structure, its long axis cross direction profiles, and the ratio of semi-minor axis length of elliptical aperture can regulate; The ratio Λ of airport spacing in covering
x/ Λ
ycan regulate with air aperture.
5. octagon photonic crystal fiber polarization beam apparatus according to claim 1, it is characterized in that: in described beam splitter end face structure, covering airport is that the mode that combines of octagon and rectangle distributes, innermost layer airport is with rectangular arranged, and remaining each layer of air hole is arranged in octagon.
6. octagon photonic crystal fiber polarization beam apparatus according to claim 1, is characterized in that: the cladding background material of described beam splitter structure is silica glass, soft glass material or polymeric material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510628544.7A CN105116486A (en) | 2015-09-29 | 2015-09-29 | Octagonal photonic crystal optical-fiber polarization beam splitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510628544.7A CN105116486A (en) | 2015-09-29 | 2015-09-29 | Octagonal photonic crystal optical-fiber polarization beam splitter |
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| CN105116486A true CN105116486A (en) | 2015-12-02 |
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| CN201510628544.7A Pending CN105116486A (en) | 2015-09-29 | 2015-09-29 | Octagonal photonic crystal optical-fiber polarization beam splitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US11391886B2 (en) * | 2020-06-25 | 2022-07-19 | IRflex Corporation | Polarization-maintaining photonic crystal fiber |
| US11506818B1 (en) | 2021-12-22 | 2022-11-22 | IRflex Corporation | Circular photonic crystal fibers |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101464538A (en) * | 2008-04-22 | 2009-06-24 | 北京航空航天大学 | Photonic crystal fiber with ultra-high double refraction and ultra-low limitation loss |
| CN102854562A (en) * | 2012-10-09 | 2013-01-02 | 天津理工大学 | High double-refraction photonic crystal fiber (PCF) |
| CN203658616U (en) * | 2014-01-08 | 2014-06-18 | 燕山大学 | Soft glass photonic crystal fiber polarization beam splitter |
| CN104216043A (en) * | 2014-07-31 | 2014-12-17 | 合肥工业大学 | Photonic crystal fiber polarization splitter |
-
2015
- 2015-09-29 CN CN201510628544.7A patent/CN105116486A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101464538A (en) * | 2008-04-22 | 2009-06-24 | 北京航空航天大学 | Photonic crystal fiber with ultra-high double refraction and ultra-low limitation loss |
| CN102854562A (en) * | 2012-10-09 | 2013-01-02 | 天津理工大学 | High double-refraction photonic crystal fiber (PCF) |
| CN203658616U (en) * | 2014-01-08 | 2014-06-18 | 燕山大学 | Soft glass photonic crystal fiber polarization beam splitter |
| CN104216043A (en) * | 2014-07-31 | 2014-12-17 | 合肥工业大学 | Photonic crystal fiber polarization splitter |
Non-Patent Citations (1)
| Title |
|---|
| 郭士亮: "八边形晶格双芯晶体光纤偏振分束器", 《发光学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US11391886B2 (en) * | 2020-06-25 | 2022-07-19 | IRflex Corporation | Polarization-maintaining photonic crystal fiber |
| US11506818B1 (en) | 2021-12-22 | 2022-11-22 | IRflex Corporation | Circular photonic crystal fibers |
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Application publication date: 20151202 |