CN208207272U - A kind of high birefringence double-core photonic crystal fiber polarization beam apparatus - Google Patents
A kind of high birefringence double-core photonic crystal fiber polarization beam apparatus Download PDFInfo
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- CN208207272U CN208207272U CN201820672341.7U CN201820672341U CN208207272U CN 208207272 U CN208207272 U CN 208207272U CN 201820672341 U CN201820672341 U CN 201820672341U CN 208207272 U CN208207272 U CN 208207272U
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Abstract
The utility model discloses a kind of high birefringence double-core photonic crystal fiber polarization beam apparatus, the polarization beam apparatus includes two fibre cores of covering and center symmetric setting, the refractive index of the fibre core is higher than the refractive index of the covering, wherein, the covering is made of the airport of background material and periodic distribution, the structure centre of the polarization beam apparatus is an oval airport, two fibre cores are then laid in the two sides of the oval airport by central symmetry, and the identical another oval airport of structure is respectively equipped on the outside of two fibre cores.The utility model structure flexible design is compact, excellent optical performance, ultrashort fiber lengths may be implemented and there is wider bandwidth range and the high birefringence double-core photonic crystal fiber polarization beam apparatus compared with High Extinction Ratio, solve that conventional polarization beam splitter volume is larger, bandwidth of operation is relatively narrow is increasingly difficult to meet the deficiencies of the needs of communication network.
Description
Technical field
The utility model belongs to optical device field, is related to a kind of with high birefringence double-core photonic crystal fiber polarization point
Beam device.
Background technique
With the development of Optical Access Network and all-optical network, fiber optic communication becomes main communication mode, wherein optical device
It is essential.Effect in optical communication system and optical-fiber network can be divided into: connection optical path or optical waveguide；Change the propagation side of light
To；Realize the distribution of optical power；It controls between optical waveguide, the optical coupling between device between optical waveguide and device；Optical channel
Top-bottom cross connection etc..The Networks of Fiber Communications of the built certain scale of China at present, but faster mobile network builds
If also needing the support of fiber optic network, with the demand of development and the network capacity extension of broadband services, there is still a need for perfect for fiber optic communication
With innovation.For fiber optic communication, ultraspeed, vast capacity and ultra-long span transmission are choosing for whole world communication system development
War, all-optical network are even more the ultimate aim that people pursue.Traditional optical-fiber network is complete photochemical between node, but at network node still
Electrical part is so used, communication network main line total capacity is limited.Optical device applied to all-optical network is for example: polarization beam apparatus,
The promotion of the performances such as add-drop multiplexer of optical directional coupler, dispersion compensator, light affects the propulsion of all-optical network, develops high
The cheap optical device of performance plays decisive role to future construction all-optical network.
Double-core photonic crystal fiber can regard two waveguides being parallel to each other as, be different from ideal single waveguide, and two flat
Traveling wave lead between there are Mode Couplings.When light beam injects a fibre core A of double-core photonic crystal fiber, fibre core A and fibre core B
Energy influence each other, i.e. fibre core A excitation mould field energy can inspire fundamental mode field in the air, which is diffused into covering
In and enter in another fibre core B influence fibre core B mode distributions, vice versa.Therefore exist in double-core photonic crystal fiber
Four modes, the respectively odd mould of X-direction and even mould, the odd mould of Y-direction and even mould.
When bandwidth is to measure polarization beam apparatus performance indicator for the length of beam splitter, delustring.Polarization beam apparatus length is direct
Can decision be kept completely separate two different polarization states of light beam, and Modern Communication System is intended to integrated development, optical device
Size is particularly important, therefore the shorter polarization beam apparatus Design of length the better.Extinction ratio is to describe the separation journey of different polarization states light
Degree, extinction ratio is bigger, and separation degree is better, and beam splitter performance is better.Bandwidth is the wave-length coverage of polarization beam apparatus work, one
Determine to determine optical communication system transmission capacity in degree, the corresponding wave-length coverage of extinction ratio -20dB is usually defined as polarization beam splitting
The bandwidth of device, bandwidth is wider, and transmission range is bigger, and optical communication system capacity is higher.
Conventional polarization beam splitter volume is big, extinction ratio is low, the design of narrow bandwidth, structure is single, limits optical communication system collection
At change and transmission capacity.Photonic crystal fiber, can be by changing size, the Kong Jian of covering airport because of its unique structure
Excellent characteristic is obtained away from, filling functional material etc., is had great advantage compared to traditional fiber tool.The application uses twin-core photon
Polarization beam splitter structure flexible design made of crystal optical fibre is easily achieved high birefringence, and then can be designed that High Extinction Ratio
The small polarization beam splitter of wider bandwidth.
Utility model content
The shortcomings that for the above-mentioned prior art or deficiency, the technical problem to be solved by the present invention is to provide a kind of structures
Flexible design is compact, excellent optical performance, ultrashort fiber lengths may be implemented and with wider bandwidth range and compared with High Extinction Ratio
High birefringence double-core photonic crystal fiber polarization beam apparatus, solve conventional polarization beam splitter volume is larger, bandwidth of operation compared with
It is narrow to be increasingly difficult to meet the deficiencies of the needs of communication network.
In order to solve the above technical problems, the utility model has following constitute:
A kind of high birefringence double-core photonic crystal fiber polarization beam apparatus, the polarization beam apparatus include covering and center
Symmetrically arranged two fibre cores, the refractive index of the fibre core are higher than the refractive index of the covering, wherein the covering is by background
Material and the airport of periodic distribution are constituted, and the structure centre of the polarization beam apparatus is an oval airport, two fibres
Core is then laid in the two sides of the oval airport by central symmetry, and it is identical to be respectively equipped with structure on the outside of two fibre cores
Another ellipse airport.
The airport being arranged in the covering is laid according to the arrangement mode that regular polygon and ellipse combine,
Wherein, the adjacent bed airport being arranged outside the heart in the structure is laid by ellipse, and remainder layer airport is then with regular polygon cloth
If.
The airport being arranged in the covering is laid according to the arrangement mode that regular hexagon and ellipse combine,
Wherein, the adjacent bed airport being arranged outside the heart in the structure is laid by ellipse, and remainder layer airport is then with regular hexagon cloth
If.
Two fibre cores on the end face of the polarization beam apparatus are clipped in the middle setting by three oval airports, wherein ellipse
Circle airport long axis is laid along longitudinal direction.
The a length of a of long axis, short axle a length of b, ellipticity η=a/b, wherein η=2 of the ellipse airport.
The airport further includes that the first round airport, the second round airport and third in three kinds of apertures are round empty
Stomata, the second air aperture layer group that the first air aperture layer group surrounded by the first round airport, the second round airport surround
And the third air aperture layer group that third circle airport surrounds successively is laid along the structure centre by internal layer outer layers,
In, the diameter d2 of the round airport of diameter d1 > second of the round airport of the diameter d3 > first of the third circle airport.
The first air aperture layer group, the second air aperture layer group and third air aperture layer group include at least one layer of airport
Layer.
The first air aperture layer group is one layer of air aperture layer surrounded by the first round airport, second airport
Layer group is one layer of air aperture layer surrounded by the second airport, and the third air aperture layer group is three layers and is surrounded by third airport
Air aperture layer.
The pitch of holes of the second round airport of the ellipse airport and adjacent thereto and setting on the outside is A2, phase
Between first round airport of neighbour's setting, between the second round airport for being disposed adjacent, the third that is disposed adjacent it is round empty
Between stomata, between the first airport and the second airport that are disposed adjacent, the second airport and third air that are disposed adjacent
Pitch of holes A1 between hole is all the same, wherein the A1 > A2.
The background material is made of quartz material or polymer material.
Compared with prior art, the utility model has the following technical effect that
The utility model overcomes the disadvantages of conventional polarization beam splitter volume is big, extinction ratio is low, narrow bandwidth, using photon crystalline substance
This new material of body, the design of structure and the configuration aspects such as pitch of holes by changing photonic crystal fiber covering airport,
High birefringence is set to reach 10-2The order of magnitude, extinction ratio are up to -76.24dB, and bandwidth of the extinction ratio less than -20dB is up to 60nm, and light
Fine length L is only 156 μm, have compared with short fiber length and higher extinction ratio, meets the following vast capacity, being easily integrated
The demand of all-optical network.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1: the cross-sectional view of the utility model high birefringence double-core photonic crystal fiber polarization beam apparatus；
Fig. 2: mode distributions figure as shown in Figure 1；
Fig. 3: the normalization transimission power of polarization beam apparatus and the relational graph of transmission range as shown in Figure 1；
Fig. 4: as shown in Figure 1 fibre polarization beam apparatus extinction ratio with wavelength change curve；
Fig. 5: the birefringent change curve with wavelength of polarization beam apparatus as shown in Figure 1.
Specific embodiment
Make furtherly below with reference to technical effect of the attached drawing to the design of the utility model, specific structure and generation
It is bright, to be fully understood from the purpose of this utility model, feature and effect.
As shown in Figure 1, the present embodiment high birefringence double-core photonic crystal fiber polarization beam apparatus, the polarization beam apparatus packet
The refractive index of the fibre core A and fibre core B, the fibre core A and fibre core B that include covering and center symmetric setting are higher than the covering
Refractive index, wherein the covering is made of the airport of background material 1 and periodic distribution, the knot of the polarization beam apparatus
Structure center is an oval airport 4, and two fibre cores are then laid in the two sides of the oval airport 4, fibre core A by central symmetry
Another oval airport 8 identical with structure is respectively equipped on the outside of fibre core B.The missing of centrosymmetric two airports forms
Fibre core A and fibre core B constitutes high-refractive-index regions；Covering is region of low refractive index, is Internal Reflection Photonic Crystal Fiber.This
Embodiment is conducive to obtain high birefringence spy by introducing 8 enhancing structure asymmetry of oval airport 4 and oval airport
Property, while the coupling length that can increase basic mode X polarization state and Y polarization state is poor, and finally may be used by rationally designing fiber lengths
To realize the separation of polarised light.The present embodiment structure flexible design is compact, excellent optical performance, and ultrashort fiber lengths may be implemented
And there is wider bandwidth range and higher extinction ratio.
In the present embodiment, double-fiber core (fibre core A and fibre core B) is that the left and right sides of center ellipse airport 4 is round empty
Stomata replaces the high birefringence region formed with quartz.In Fig. 1, the appended drawing reference of shown fibre core A is 1, the attached drawing of fibre core B
Labeled as 2.
In the present embodiment, optical fiber follows full-internal reflection type transmission mode.
The airport being arranged in the covering is laid according to the arrangement mode that regular polygon and ellipse combine,
Wherein, the adjacent bed airport being arranged outside the heart in the structure is laid by ellipse, and remainder layer airport is then with regular polygon cloth
If.Structures, the specific structures such as the regular polygon is square, regular pentagon, regular hexagon, octagon can be according to reality
Situation carries out adaptability selection.
Further, in the present embodiment, the airport in the covering is set according to regular hexagon and oval phase
In conjunction with arrangement mode laid, wherein the adjacent bed airport outside the heart is laid by ellipse in the structure for setting, remaining
Layer airport is then laid with regular hexagon.In the present embodiment, each introducing is a pair of described below at the fibre core A and fibre core B
The first airport 7 being relatively large in diameter and a pair of oval airport 8, and approximate ellipse shape is presented, increases polarization beam splitting
The asymmetry of mirror keeps design length smaller.
Two fibre cores (fibre core A and fibre core B) on the end face of the polarization beam apparatus are identical oval empty by three structures
Be clipped in the middle stomata (an oval airport 4 and two oval airports 8) setting, wherein above-mentioned ellipse airport 4 and ellipse
The long axis of airport 8 is laid along longitudinal direction, by changing the numerical values recited of transverse and short axle, realizes any tune of ellipticity
Section；By introducing above-mentioned ellipsoidal structure, structure asymmetry is enhanced, the photonic crystal fiber for obtaining high birefringence is conducive to
Polarization beam apparatus.
In the present embodiment, a length of a of long axis of the oval airport 4 or oval airport 8, a length of b of short axle, ellipticity
η=a/b, wherein η=2, ellipticity can realize any adjusting, three kinds of circles described below by changing long axis and short axle
Shape airport and pitch of holes also can change, and adjust coupling length size to facilitate.
The airport further includes the first round airport 6 of round airport 7, second and third circle in three kinds of apertures
Airport 5, the second airport that the first air aperture layer group surrounded by the first round airport 7, the second round airport 6 surround
Layer group and the third air aperture layer group that surrounds of third circle airport 5 are successively along the structure centre from internal layer outer layers cloth
If, wherein the round airport 6 of diameter d1 > second of the round airport 7 of the diameter d3 > first of the third circle airport 5
Diameter d2.Wherein, in the present embodiment, d3=0.7 μm, d2=0.64 μm, d1=0.86 μm.
The first air aperture layer group, the second air aperture layer group and third air aperture layer group include at least one layer of airport
Layer.
In the present embodiment, the first air aperture layer group is one layer of air aperture layer surrounded by the first round airport 7,
The second air aperture layer group is one layer of air aperture layer surrounded by the second airport 6, and the third air aperture layer group is three layers
The air aperture layer surrounded by third airport 5 is specific to lay mode as shown in Figure 1.The laying number of plies of different air layer groups according to
Actual needs can suitably be increased and decreased adjustment.
The pitch of holes of the second round airport 6 of the ellipse airport 8 and adjacent thereto and setting on the outside is A2,
Between the round airport 7 of first be disposed adjacent, between the second round airport 6 for being disposed adjacent, the third circle that is disposed adjacent
Between shape airport 5, between the first airport 7 and the second airport 6 that are disposed adjacent, the second airport 6 for being disposed adjacent with
Pitch of holes A1 between third airport 6 is all the same, the A1 > A2.In the present embodiment, A1=0.9 μm, A2=0.6 μm.
In actual use, High Extinction Ratio and wider bandwidth can be realized by adjusting above-mentioned pitch of holes A1 and A2.The back
Scape material 1 is made of quartz material or polymer material, effective refractive index 1.45, and the effective refractive index of airport is 1.
As shown in Fig. 2, the arrow in figure represents direction of an electric field, as seen from the figure, energy is concentrated mainly in twin-core, fibre core A
It influences each other formation mode coupling with fibre core B energy, therefore there are four modes, that is, X-direction surprise moulds for double-core photonic crystal fiber
Field, X-direction idol mould field, Y-direction surprise mould field, Y-direction idol mould field, wherein Fig. 2 is the odd mould field of Y-direction at wavelength X=1.55 μm
Figure.
As shown in figure 3, due in double-core photonic crystal fiber two Vertical Squares upwardly propagate constant difference, lead to two polarizations
The coupling length of state is different, therefore polarization state separation may be implemented by rationally designing fiber lengths, as can be seen from Figure 3, can prepare
L=156 μm of conveying length of polarization beam apparatus.When λ=1.55 μm, X polarised light is all exported from fibre core A, and Y polarised light is then
It is coupled in fibre core B and exports, two light realizations is kept completely separate.Wherein polarised light is X polarised light as shown in the figure, another
For Y polarised light.
The present embodiment uses L=156 μm of length of polarization beam apparatus, and extinction ratio is with wavelength change curve graph such as Fig. 4 institute
Show, from figure it can be concluded that when λ=1.55 μm, extinction ratio can obtain -76.24dB, and extinction ratio is reachable less than the bandwidth of -20dB
60nm has larger extinction ratio and broadband at this time.
As shown in figure 5, ellipsoidal structure is introduced in polarization beam apparatus can be enhanced the asymmetry of polarization beam apparatus, it can
To obtain higher mode birefringence, while being obtained at λ=1.55 μm by adjusting the structural parameters such as pitch of holes, hole size
10-2The high birefringence of magnitude, two orders of magnitude higher than common polarization maintaining optical fibre.
It can be obtained by analyzing above, upper the present embodiment high birefringence double-core photonic crystal fiber polarization beam apparatus, optical fiber is long
Spending L is 156 μm, and extinction ratio is up to -76.24dB, and it is with wider bandwidth.
The utility model overcomes the disadvantages of conventional polarization beam splitter volume is big, extinction ratio is low, narrow bandwidth, using photon crystalline substance
This new material of body, the design of structure and the configuration aspects such as pitch of holes by changing photonic crystal fiber covering airport,
High birefringence is set to reach 10-2The order of magnitude, while extinction ratio is up to -76.24 dB, extinction ratio is reachable less than the bandwidth of -20dB
60nm, and fiber lengths are only 156 μm, are had compared with short fiber length and compared with High Extinction Ratio, meet the following vast capacity, are easy to collect
At the demand of the all-optical network of change.
Above embodiments are only to illustrate the technical solution of the utility model and non-limiting, referring to preferred embodiment to this reality
It is described in detail with novel.Those skilled in the art should understand that can be to the technical solution of the utility model
It modifies or equivalent replacement should all cover practical new at this without departing from the spirit and scope of the technical scheme of the present invention
In the scope of the claims of type.
Claims (10)
1. a kind of high birefringence double-core photonic crystal fiber polarization beam apparatus, which is characterized in that
The polarization beam apparatus includes two fibre cores of covering and center symmetric setting, and the refractive index of the fibre core is higher than described
The refractive index of covering,
Wherein, the covering is made of the airport of background material and periodic distribution,
The structure centre of the polarization beam apparatus is an oval airport, and two fibre cores are then laid in by central symmetry described ellipse
The two sides of circle airport；
The identical another oval airport of structure is respectively equipped on the outside of two fibre cores.
2. polarization beam apparatus according to claim 1, which is characterized in that the airport in the covering is arranged according to just
The arrangement mode that polygon and ellipse combine is laid, wherein the adjacent bed airport outside the heart in the structure is arranged
It is laid by ellipse, remainder layer airport is then laid with regular polygon.
3. polarization beam apparatus according to claim 2, which is characterized in that the airport in the covering is arranged according to just
The arrangement mode that hexagon and ellipse combine is laid, wherein the adjacent bed airport outside the heart in the structure is arranged
It is laid by ellipse, remainder layer airport is then laid with regular hexagon.
4. polarization beam apparatus according to claim 1, which is characterized in that two fibres on the end face of the polarization beam apparatus
Core is clipped in the middle setting by three oval airports, wherein oval airport long axis is laid along longitudinal direction.
5. polarization beam apparatus according to claim 4, which is characterized in that a length of a of long axis of the ellipse airport, short axle
A length of b, ellipticity η=a/b, wherein η=2.
6. polarization beam apparatus according to claim 1, which is characterized in that
The airport further includes the first round airport, the second round airport and third circle air in three kinds of apertures
Hole,
The second air aperture layer group that the first air aperture layer group for being surrounded by the first round airport, the second round airport surround with
And the third air aperture layer group that third circle airport surrounds successively is laid along the structure centre from internal layer outer layers,
Wherein, the round airport of diameter d1 > second of the round airport of the diameter d3 > first of the third circle airport
Diameter d2.
7. polarization beam apparatus according to claim 6, which is characterized in that the first air aperture layer group, the second airport
Layer group and third air aperture layer group include at least one layer of air aperture layer.
8. polarization beam apparatus according to claim 7, which is characterized in that the first air aperture layer group is one layer by first
The air aperture layer that round airport surrounds, the second air aperture layer group are one layer of air aperture layer surrounded by the second airport,
The third air aperture layer group is three layers of air aperture layer surrounded by third airport.
9. polarization beam apparatus according to claim 1, which is characterized in that the ellipse airport and adjacent thereto and setting
The pitch of holes of the round airport of second on the outside is A2, between the round airport of first be disposed adjacent, is disposed adjacent
Between second round airport, between the third circle airport that is disposed adjacent, the first airport and the second sky that are disposed adjacent
Pitch of holes A1 between stomata, between the second airport being disposed adjacent and third airport is all the same, wherein the A1 >
A2。
10. polarization beam apparatus according to any one of claims 1 to 9, which is characterized in that the background material is by quartzy material
Material or polymer material are made.
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|---|---|---|---|
| CN201820672341.7U CN208207272U (en) | 2018-05-07 | 2018-05-07 | A kind of high birefringence double-core photonic crystal fiber polarization beam apparatus |
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Cited By (2)
| 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 |
| CN112230328A (en) * | 2020-10-29 | 2021-01-15 | 北京邮电大学 | Ultrashort double-core photonic crystal fiber polarization beam splitter based on gold filling |
-
2018
- 2018-05-07 CN CN201820672341.7U patent/CN208207272U/en not_active Expired - Fee Related
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 |
| CN108415121B (en) * | 2018-05-07 | 2024-04-16 | 上海理工大学 | High-birefringence double-core photonic crystal fiber polarization beam splitter |
| CN112230328A (en) * | 2020-10-29 | 2021-01-15 | 北京邮电大学 | Ultrashort double-core photonic crystal fiber polarization beam splitter based on gold filling |
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