CN106054311A - High-birefringence composite pohotonic crystal fiber - Google Patents
High-birefringence composite pohotonic crystal fiber Download PDFInfo
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- CN106054311A CN106054311A CN201610668507.3A CN201610668507A CN106054311A CN 106054311 A CN106054311 A CN 106054311A CN 201610668507 A CN201610668507 A CN 201610668507A CN 106054311 A CN106054311 A CN 106054311A
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- photonic crystal
- high birefringence
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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
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a high-birefringence composite pohotonic crystal fiber, and the pohotonic crystal fiber comprises a fiber core and a cladding layer which surrounds the fiber core. The cladding layer is provided with a plurality of first air holes, and the plurality of first air holes takes the fiber core as the center to sequentially surround the fiber core from the inside to the outside. The structures of the first air holes are the same. The cable core comprises a substrate material and second air holes disposed in the substrate material. Third air holes are disposed between the second air holes and the first air holes. According to the invention, the third air holes are disposed between the second air holes and the first air holes. The structure of the fiber does not have rotational symmetry, does not have a degenerate cross-polarization mode, and represents high birefringence. Meanwhile, because the air holes are introduced in the fiber core, a large amount of energy of a terahertz wave is transmitted in a low-loss air hole, thereby greatly reducing the loss of the fiber. The fiber is simple in structure, and is easy to implement.
Description
Technical field
The present invention relates to Hz optical fiber technical field, particularly to a kind of high birefringence composite photonic crystal optical fiber.
Background technology
In recent years, Terahertz correlation technique is of increased attention, at medical diagnosis, and bio-imaging, change
Learning detection to analyze, the field such as safety check, communication shows wide application prospect.But current Terahertz system relies primarily on certainly
Realized THz wave transmission by space, lack low-loss, flexible THz wave guiding method, largely limit Terahertz
The range of application of technology.
THz wave has stronger absorption in most of solid material, transmits for THz wave, reduces it
One key factor of loss is exactly to reduce material to absorb the assertive evidence of THz wave.Due to THz wave in the polymeric material
Absorption loss relatively low, in recent years, domestic and international research worker carried out substantial amounts of polymer Hz optical fiber research.Photon
Crystal optical fibre has another name called microstructured optical fibers, and it can realize many traditional fiber by the flexible design of airport structure does not possesses
Characteristic, high birefringence is such as provided, thus realizes protecting bias energy, the Terahertz microstructured optical fibers therefore developing high birefringence becomes
A focus for Terahertz field.
Air-core photonic band-gap type optical fiber relies on photonic band gap effect transmission THz wave, and THz wave is mainly at sky
Gaseous core transmits, is a kind of preferably low-loss Hz optical fiber, but band gap is narrow to be limited by transmitting, and is not suitable for broadband too
Hertz wave transmits, and preparation technology is required higher by Bandgap-photonic optical fiber.In recent years, Terahertz porous optical fiber starts by people
Concern [document: (1) S.Atakaramians, et al., " Porous fibers:a novel approach to
Lowloss THz waveguides, " Opt.Express, 2008,16 (12): 8845；(2) B.Ung, et al., " Polymer
Microstructured optical fibers forterahertz wave guiding, " Opt.Express, 2011,19
(26): B848].Porous optical fiber uses the loose structure of sub-wavelength airport composition to be fibre core, and air, as covering, is formed complete interior
Reflection-type optical fiber, THz wave has portion of energy to transmit in low-loss sub-wavelength airport, greatly reduces the damage of optical fiber
Consumption.But sub-wavelength porous optical fiber has considerable fraction of energy to propagate in air cladding layer, it is easily subject to the dry of external environment
Disturb, such as, by there being the water of strong absorption to be affected on THz wave, therefore its range of application is very limited.In order to avoid
The interference of external environment, introduces sub-wavelength airport structure in the fibre core of fully-reflected type photonic crystal fiber and reduces optical fiber damage
Consumption starts to receive concern [document: M.Uthman, et al., " the Design and Characterization of of people
Low-LossPorous-Core Photonic Crystal Fiber, " IEEE Photon.J., 2012,4 (6), 2315].
Islam et al. reports the symmetry by the fibre core and covering destroying porous microstructure optical fibre simultaneously, at 1THz
Time, Birefringence numbers is up to 0.04 [document: R.Islam, et al., " Novel porous fiber based on dual-
Asymmetry forlow-loss polarization maintaining THz waveguidance, " Optics
Letters, 2016,41 (3), 440].But this optical fiber structure is relative complex, it is difficult to widely used micro-by method of piling etc.
Prepared by structured optical fiber preparation method.Have been reported that proposition uses diamond structure fibre core, the birefringence of wholecircle shape airport structure recently
Microstructured optical fibers, but its Birefringence numbers is relatively low, limitation loss of a relatively high [document: R.Islam, et al., " A Novel
Low-Loss Diamond-Core Porous Fiber forPolarization Maintaining Terahertz
Transmission, " IEEE Photon.Technol.Lett., 2016,28 (14), 1537].Document report is also had to use square
Shape airport as fibre core, Terahertz hole optical photonic crystal fiber Birefringence numbers also can reach the 10-2 order of magnitude [document:
R.Islam, et al., " Extremely High-Birefringent AsymmetricSlotted-Core Photonic
Crystal Fiber in THz Regime, " IEEE Photon.Technol.Lett., 2015,27 (21), 2222].But
These optical fiber structures introduce the non-circular labyrinths such as rectangle, are difficult to ensure that covering airport structure is with fine in preparation process
The integrity of cored structure, complicated process of preparation, it is difficult to realize.
Summary of the invention
It is an object of the invention to provide a kind of high birefringence composite photonic crystal optical fiber, of the prior art double to solve
Refraction Hz optical fiber structure is complicated, Birefringence numbers is low and high technical problem is lost.
The present invention provides a kind of high birefringence composite photonic crystal optical fiber, described high birefringence composite photonic crystal optical fiber bag
Include fibre core and be surrounded on the covering of fibre core, described covering is provided with multiple first airport, multiple described first airports with
The most successively around fibre core centered by described fibre core, the structure of described first airport is identical, and described fibre core includes substrate
Material and the second airport being arranged in base material, be provided with the between described second airport and described first airport
Three airports.
Further, described 3rd airport includes horizontally disposed two described second airports, described second air
Hole is vertically installed in described base material.
Further, the diameter of described first airport is more than or equal to the described first OC ratio of airport
0.6, and less than or equal to 0.95.
Further, described first airport of part or the most described first airport are filled with water, ethanol or dioxy
Change carbon.
Further, described second airport is made up of the round shape airport of two, or is single elliptoid second
Airport.
Further, described first airport is circular.
Further, the described first airport diameter of round shape is more than or equal to the diameter ratio of described second airport
1.5, less than or equal to 3.5.
Further, the spacing of described second airport of adjacent round shape is 25-50 μm.
Further, the material of described base material is cyclic olefin polymer, politef, polyethylene or poly-carbonic acid
Ester.
Further, three adjacent described first airport arrangements triangular in shape.
Described in the high birefringence composite photonic crystal optical fiber that the present invention provides, covering is provided with multiple first airport,
Multiple described first airports centered by described fibre core the most successively around fibre core, the structure phase of described first airport
Base material and the second airport being arranged in base material is included, described second airport and described the with, described fibre core
The 3rd airport it is provided with between one airport.It is provided with between heretofore described second airport and described first airport
3rd airport, optical fiber structure does not possess rotational symmetry, there is not the orthogonal polarization modes of degeneracy, thus shows the highest double
Refraction.Simultaneously because the introducing of airport in fibre core, THz wave has significant portion energy to transmit in low-loss air hole, greatly
Reduce greatly the loss of optical fiber, there is the advantage such as simple in construction and easy realization.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of high birefringence composite photonic crystal optical fiber according to embodiments of the present invention；
Fig. 2 is the structural representation of the fibre core of Fig. 1；
Fig. 3 is that the birefringence that high birefringence composite photonic crystal optical fiber according to embodiments of the present invention changes with frequency is bent
Line；
Fig. 4 is high birefringence composite photonic crystal optical fiber effective absorbed damage curve according to embodiments of the present invention.
In figure:
1-covering；2-the first airport；3-the 3rd airport；
4-the second airport.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Combination mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " connects " and should do
Broadly understood, connect for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Can be to be mechanically connected,
It can also be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two element internals
Connection.For the ordinary skill in the art, above-mentioned term specifically containing in the present invention can be understood with concrete condition
Justice.
As depicted in figs. 1 and 2, the high birefringence composite photonic crystal optical fiber that the present invention provides includes: fibre core and being surrounded on
The covering 1 of fibre core, is provided with multiple first airport 2 in described covering 1, multiple described first airports 2 with described fibre core are
Center is the most successively around fibre core, and the structure of described first airport 2 is identical, and described fibre core includes base material and setting
The second airport 4 in base material, is provided with the 3rd air between described second airport 4 and described first airport 2
Hole 3.Class ellipticity is the axial length of left and right, the second airport 4 that upper and lower axle is short.
Being provided with the 3rd airport 3 between heretofore described second airport 4 and described first airport 2, optical fiber is tied
Structure does not possess rotational symmetry, there is not the orthogonal polarization modes of degeneracy, thus shows the highest birefringence.Simultaneously because fibre core
The introducing of middle airport, THz wave has significant portion energy to transmit in low-loss air hole, greatly reduces the damage of optical fiber
Consumption, has the advantage such as simple in construction and easy realization.
In the high birefringence Hz optical fiber designed by the present invention, in the 3rd airport 3 and fibre core the size of diplopore with
First airport 2 size of covering 1 is suitable, and arrangement is simple.Described second airport 4 can be in class ellipticity, due to fibre core
In introduce the second airport 4 that asymmetrical class is oval, this structure does not possess rotational symmetry.
Described 3rd airport 3 includes horizontally disposed two described second airports 4, and described second airport 4 is vertical
It is arranged in described base material.The diameter of described first airport 2 is more than with the described first OC ratio of airport 2
Or equal to 0.6, and less than or equal to 0.95.
The second circular airport 4 number introduced in fibre core of the present invention is 2, the second oval airport
4 count as 1 far fewer than the porous optical fiber structure reported before this.Optical fiber structure of the present invention is wholecircle shape or full elliptical
The first airport 2 and arrangement simple, preparation technology is simple, easily realizes.
Further, described second airport 4 is made up of the round shape airport of two, two round shape be easy to processing.Or
For single elliptoid second airport 4, single elliptoid second airport 4 can reduce processing quantity, saves step.
Further, the diameter ratio of described first airport 2 diameter of round shape and described second airport 4 more than or etc.
In 1.5, less than or equal to 3.5.The spacing of described second airport 4 of adjacent round shape is 25-50 μm.
So that THz wave is easier to permeate in covering 1 region, i.e. it is more readily formed high birefringence, further
Ground, the first airport 2 described in the present embodiment is circular or oval (oval is not shown).Oval described first is empty
The short axle of pore 2 is 0.5-1 with the ratio of major axis.Ratio is between 0-1, and ratio is the least, and oval shape is the most elongated, bag
The anisotropy of layer 1 refractive index is the biggest, and THz wave is easier to permeate in covering 1 region, is i.e. more readily formed Gao Shuan
Refraction, but increase the leakage losses of transmission simultaneously.Ratio levels off to 1, ellipse i.e. sub-circular, refractive index in covering 1
Anisotropy is the least, and birefringence effect is the most relatively weak.The leakage losses and the birefringence effect ratio that consider covering 1 are
0.5-1.
Further, adjacent described first airport 2 center distance is 50-100 μm.Described first airport 2 center
Spacing is more than the diameter 5-10 μm of described first airport 2.
So that birefringence level decreases, further, described first airport 2 of part or complete in the present embodiment
First airport 2 described in portion is filled with the refractive indexs such as water, ethanol or carbon dioxide less than base material refractive index higher than air
The material of refractive index.The material of described base material is cyclic olefin polymer, politef, polyethylene or Merlon.Only
If refractive index belongs to scope more than the material of air, it would however also be possible to employ cyclic olefin polymer, it is at terahertz
Hereby refractive index n=1.5 of wave band.
It is in refractive index n=1.5 of terahertz wave band, and in the range of 1-3THz, the material setting cyclic olefin polymer is inhaled
Receive loss for 1cm-1.First airport 2 all arranges according to triangular crystal lattice, and circular port diameter is set as d=70um, in hole in the heart
Away from Λ=75 μm.The diameter of the second airport 4 is identical, diameter dc=30um, often group diplopore spacing Λ c=35um.Second air
The diplopore unit in hole 4 is parallel to Y-axis, and the diplopore unit of remaining 6 group of the 3rd airport 3 is parallel to X-axis.
Fig. 3 is that the birefringence of optical fiber described in Fig. 1 embodiment calculated by full-vector finite element method is with the change of frequency
Rule, in the range of 1-3THz, birefringence is maintained at 10-2 magnitude, and along with the increase of frequency, Birefringence numbers increases.
In the present embodiment, as seen from Figure 3, in the range of 1-3THz, the absorbed of optical fiber shown in embodiment is damaged
Consumption increases along with the increase of frequency, and when frequency is 2THz, the absorbed loss of X polarization direction is inclined for 0.65cm-1, Y
Shake the absorbed loss in direction for 0.5cm-1.
It is electric field strength scattergram during 1.5THz from described optical fiber in frequency.It can be seen that X polarization mode and Y polarization mode
All effectively being limited in fiber core transmission, the airport in fibre core also has pattern constraint ability simultaneously.
Described in the high birefringence composite photonic crystal optical fiber that the present invention provides, covering 1 is provided with multiple first airport
2, multiple described first airports 2 centered by described fibre core the most successively around fibre core, the knot of described first airport 2
Structure is identical, and described fibre core includes base material and the second airport 4 being arranged in base material, described second airport 4 with
It is provided with the 3rd airport 3 between described first airport 2.Heretofore described second airport 4 and described first airport 2
Between be provided with the 3rd airport 3, optical fiber structure does not possess rotational symmetry, there is not the orthogonal polarization modes of degeneracy, thus table
Reveal the highest birefringence.Simultaneously because the introducing of airport in fibre core, THz wave has significant portion energy empty in low-loss
Pore transmits, greatly reduces the loss of optical fiber, there is the advantage such as simple in construction and easy realization.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. a high birefringence composite photonic crystal optical fiber, it is characterised in that include fibre core and be surrounded on the covering of fibre core, described
Covering is provided with multiple first airport, multiple described first airport cinctures the most successively centered by described fibre core
Fibre core, the structure of described first airport is identical, and described fibre core includes base material and the second sky being arranged in base material
Pore, is provided with the 3rd airport between described second airport and described first airport.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described 3rd airport bag
Including horizontally disposed two described second airports, described second airport is vertically installed in described base material.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described first airport
Diameter and the described first OC ratio of airport are more than or equal to 0.6, and are less than or equal to 0.95.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described first air of part
Hole or the most described first airport are filled with water, ethanol or carbon dioxide.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described second airport by
The round shape airport composition of two, or be single elliptoid second airport.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described first airport is
Circular.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described the first of round shape is empty
Hole diameter is more than or equal to 1.5, less than or equal to 3.5 with the diameter ratio of described second airport.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that adjacent round shape described
The spacing of the second airport is 25-50 μm.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that the material of described base material
Matter is cyclic olefin polymer, politef, polyethylene or Merlon.
High birefringence composite photonic crystal optical fiber the most according to claim 1, it is characterised in that described in adjacent three
First airport arrangement triangular in shape.
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Cited By (3)
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| CN109143462A (en) * | 2018-10-12 | 2019-01-04 | 西安邮电大学 | A kind of high birefringence dung beetle shape fibre core photonic crystal fiber |
| CN109405858A (en) * | 2018-12-14 | 2019-03-01 | 东北大学 | A kind of novel D type microstructure fiber sensor and preparation method thereof |
| CN114207936A (en) * | 2019-08-05 | 2022-03-18 | 莱尼电缆有限公司 | Dielectric waveguide |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143462A (en) * | 2018-10-12 | 2019-01-04 | 西安邮电大学 | A kind of high birefringence dung beetle shape fibre core photonic crystal fiber |
| CN109143462B (en) * | 2018-10-12 | 2021-04-13 | 西安邮电大学 | High-birefringence dung beetle-shaped fiber core photonic crystal fiber |
| CN109405858A (en) * | 2018-12-14 | 2019-03-01 | 东北大学 | A kind of novel D type microstructure fiber sensor and preparation method thereof |
| CN114207936A (en) * | 2019-08-05 | 2022-03-18 | 莱尼电缆有限公司 | Dielectric waveguide |
| US12057614B2 (en) | 2019-08-05 | 2024-08-06 | Leoni Kabel Gmbh | Dielectric waveguide |
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