CN102707374A - Terahertz photonic crystal fiber - Google Patents
Terahertz photonic crystal fiber Download PDFInfo
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- CN102707374A CN102707374A CN2012102027391A CN201210202739A CN102707374A CN 102707374 A CN102707374 A CN 102707374A CN 2012102027391 A CN2012102027391 A CN 2012102027391A CN 201210202739 A CN201210202739 A CN 201210202739A CN 102707374 A CN102707374 A CN 102707374A
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- air element
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- crystal fiber
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Abstract
The invention discloses a terahertz photonic crystal fiber. Fiber cores are made of a solid background material; the air holes of a cladding have the same structure; every four air holes form a rhomboid air unit; and the rhomboid air units have the same structure and are arranged periodically in the background material. The air holes are elliptical holes; the major axis of each elliptical hole is parallel to the long diagonal line of each rhomboid air unit; the transverse diagonal line and the longitudinal diagonal line of each rhomboid air unit are equal; the area occupied by a fiber core is the area occupied by the rhomboid air unit; and the areas are arranged according to the same period. The centers of a plurality of rhomboid air units are arranged in rows horizontally, with equal horizontal spacing; every two rows are arranged in lines longitudinally, with equal longitudinal spacing. Part or all air holes can be filled with the material with the refractive index lower than that of the fiber background material and higher than that of air. The background material is the polymeric materials such as polyfluortetraethylene, polyethylene and polycarbonate. The photonic crystal fiber provided by the invention is not easily interfered by external environment; the manufacturing difficulty is reduced; and the photonic crystal fiber has a high birefringence value in a wide terahertz wave band, and the birefringence value can be adjusted by adjusting the structural parameters such as the major axis and the minor axis of ellipse.
Description
(1) technical field
The present invention relates to the terahertz waveguide technical field, be specifically related to a kind of terahertz light photonic crystal fiber with high birefringence.
(2) background technology
THz wave is in electromagnetic wave spectrum between microwave and the infrared radiation ripple, and its frequency range is 0.1～10THz.In recent years; Progress along with terahertz emission source and Detection Techniques; THz wave more and more receives people's attention, but because THz wave transmission attenuation in free space is very big, and terahertz waveguide can effectively solve the big problem of transmission attenuation; So the development terahertz waveguide has important and practical meanings.
In general single mode fiber; If optical fiber receives pressure effect at random perpendicular to axial direction, will be transformed into oval structure to a certain extent by perfect circular configuration at fiber end face, the polarization mode on two orthogonal polarization orientation is degeneracy no longer; Its pattern constant β is slightly different; And in communication process, intercouple, this mode birefringence effect changes any attitude into after can making the linear polarization of incident transmit a segment distance, i.e. the light signal generation random birefringence of incident.In order to keep the polarization characteristic of pattern, can introduce high birefringence artificially, birefringent power can be clapped long L with pattern
BWith the refringence B=|n on two orthogonal directionss
x-n
y| expression.So, in the terahertz waveguide design, need to consider birefringent problem equally.
Photonic crystal fiber is called porous optical fiber or microstructured optical fibers again, is one of focus of current international research.The xsect of this optical fiber can be divided into fibre core and covering.Fibre core is the solid background material that refractive index is higher than cladding-effective-index, perhaps is airport, perhaps inserts the fibre core that refractive index is lower than other leaded light of background material.Covering is around fibre core, and the refractive index of covering is lower than fibre core, and airport of regular arrangement extends vertically on it.This type of photonic crystal fiber carries out leaded light through total internal reflection principle.Through parameters such as adjustment photonic crystal fiber end face airport size, shape and pitchs of holes, make two orthogonal directionss of fiber end face have bigger refringence, thereby can obtain the high birefringence characteristic.
The photonic crystal fiber technology provides a good platform for the practical application of THz wave waveguide technology.High birefringence terahertz light photonic crystal fiber is used in Terahertz sensing and communication aspects widely.At present to the research of high birefringence terahertz light photonic crystal fiber more be respectively hollow core structures forbidden photon band type photonic crystal fiber, utilize air to introduce the refractive index guided mode type photonic crystal fiber of aperture as the refractive index guided mode type photonic crystal fiber of cladding structure and at fibre core.Utilize air cladding layer to receive the external environment factor easily and disturb, and introduce aperture or hollow core structures, will increase the technical difficulty in the making at fibre core.
The terahertz light photonic crystal fiber that need in the broad terahertz wave band, have the high birefringence characteristic, and this structure will be easy to make realization.
(3) summary of the invention
The purpose of this invention is to provide a kind of terahertz light photonic crystal fiber, the airport of its covering is the rhombus air element that is evenly distributed in the background material, and each rhombus air element is made up of 4 airports.Can in the THz wave segment limit, have high birefringence rate.
The terahertz light photonic crystal fiber of the present invention's design, the xsect of this optical fiber is divided into fibre core and covering.Fibre core is solid background material, and covering is around fibre core, and airport of regular arrangement extends vertically on it, so the refractive index of covering is lower than the refractive index of fibre core; The airport structure of said cross section of optic fibre top covering is identical, and rhombus air element that structure is identical of per 4 airports composition, and a plurality of rhombus air element on the covering are periodic arrangement in background material.
Said airport is oval airport, and major axis and minor axis are respectively b and a, and the major axis of oval airport is parallel with the long-diagonal of rhombus air element.
a/b=η。The span of η is 0 < η≤1 in theory; The η value is more little, and oval shape is just elongated more, and the anisotropy of cladding index is just big more; THz wave just permeates in the cladding regions more easily; Promptly form high birefringence more easily, but increased the leakage losses of transmission simultaneously, also strengthened the manufacture difficulty of elliptical aperture.And η levels off to 1, and ellipse is a sub-circular, and the anisotropy of refractive index is just less in the covering, birefringence effect just relatively a little less than.Take all factors into consideration the leakage losses and the birefringence effect of covering, preferred version is 0.5≤η≤1.
The horizontal diagonal line Λ of said each rhombus air element
aAll equate, vertically diagonal line Λ
bAlso equate 0<Λ
a/ Λ
b≤1.Preferred version is 0.4≤Λ
a/ Λ
b≤1.
The shared zone of fibre core of said solid background material is a shared zone of rhombus air element.And the shared zone of fibre core and other rhombus air element are arranged by same period.
Rhombus air element in the said covering is periodic arrangement; Horizontal diagonal line with certain rhombus air element is the center of this rhombus air element with vertical intersection of diagonal; The center of same row's rhombus air element is in same straight line, and the horizontal spacing Λ at adjacent rhombus air element center among the same row
xAll equate.Adjacent two rows' rhombus air element staggers, and every interval one arranges longitudinally that the rhombus air element becomes row, and the center of the rhombus air element of same column is in same straight line, and the longitudinal pitch Λ at adjacent rhombus air element center in the same row
yEquate that all the residing straight line mutual spacing in the center of each row rhombus air element equates.Preferred version is 0.25≤Λ
x/ Λ
y≤0.5.
Also can have part airport or whole airport in the said covering are filled with the material that refractive index is lower than optical fiber background material refractive index, is higher than air refraction.Said material can be water or ethanol or carbon dioxide or teflon or tygon etc.
The background material of said optical fiber is a teflon, or tygon, or polymeric material such as polycarbonate.
Terahertz light photonic crystal fiber of the present invention has the following advantages: 1, compare as the terahertz light photonic crystal fiber of covering with utilizing air; Terahertz light photonic crystal fiber of the present invention; Be not subject to the external environment factor and disturb, can be applicable to complicated transmission environment better; 2, compare with hollow forbidden photon band type terahertz light photonic crystal fiber, greatly reduce manufacture difficulty; 3, in the terahertz wave band of broad, have the high birefringence characteristic, the birefringence value in 160 μ m～400 mu m wavebands is all greater than 1.8 * 10
-3And increase with wavelength, birefringence value also can constantly increase, and is fit to be applied to broadband Terahertz system; 4, adjust the laterally vertical diagonal line of oval major and minor axis, rhombus air element and the spacing of rhombus air element, can obtain the optical fiber of a certain birefringence value; 5, can make optical fiber of the present invention with the manufacture craft and the equipment of existing photonic crystal fiber, and it is made, and other terahertz light photonic crystal fiber is simple relatively.
(4) description of drawings
Fig. 1 is this terahertz light photonic crystal fiber embodiment cross sectional representation.
A, b are respectively the minor axis and the major axis of oval airport, Λ among the figure
a, Λ
bBe respectively laterally diagonal line and vertically diagonal line in the rhombus air element, Λ
xBe the horizontal spacing at the adjacent rhombus air element center of same row, Λ
yLongitudinal pitch for the adjacent rhombus air element of same column center.
Fig. 2 is the birefringent characteristic curve of this terahertz light photonic crystal fiber embodiment in 100 μ m ~ 400 mu m wavebands.
Fig. 3 be this terahertz light photonic crystal fiber embodiment in covering near the birefringent characteristic curve in 100 μ m～400 mu m wavebands behind 6 airport filled polytetrafluoroethylene materials of fibre core.
(5) embodiment
Embodiment is as shown in Figure 1 for this terahertz light photonic crystal fiber, and the xsect of this optical fiber is divided into fibre core and covering.Fibre core is solid background material, and this routine background material is a high density polyethylene.Covering is around fibre core, and airport of regular arrangement extends vertically on it; The airport structure of said cross section of optic fibre top covering is identical, is oval airport, and major axis and minor axis are respectively b and a, this routine a=56 μ m, b=80 μ m, a/b=η=0.7.And per 4 airports are formed the rhombus air element that structure is identical, and a plurality of rhombus air element on the covering are periodic arrangement in background material.The airport of 4 dotted lines in top is represented a rhombus air element among Fig. 1.
The major axis of oval airport is parallel with the long-diagonal of rhombus air element.
The horizontal diagonal line Λ of each rhombus air element of this example
a=120 μ m all equate, vertical diagonal line Λ
b=240 μ m, Λ
a/ Λ
b=1/2.
The shared zone of fibre core of said solid background material is a shared zone of rhombus air element.And the shared zone of fibre core and other rhombus air element are arranged by same period.
Horizontal diagonal line with certain rhombus air element is the center of this rhombus air element with vertical intersection of diagonal, and the center of same row's rhombus air element is in same straight line, and the horizontal spacing Λ at same row's adjacent rhombus air element center
x=240 μ m.Adjacent two rows' rhombus air element staggers, and each rhombus air element of every interval one row becomes row, and the center of the rhombus air element of same column is in same straight line, and the longitudinal pitch Λ at adjacent rhombus air element center in each row
y=640 μ m, Λ
x/ Λ
y=0.375, the residing straight line mutual spacing in the center of each row rhombus air element equates that this example is 120 μ m.
Shown in Figure 2 is the birefringent characteristic curve of this terahertz light photonic crystal fiber embodiment in 100 μ m～400 mu m wavebands.Its ordinate is a birefringence value, and horizontal ordinate is a wavelength.Can find out that by Fig. 2 the birefringence value of the terahertz light photonic crystal fiber of present embodiment in 160 μ m～400 mu m wavebands is all greater than 1.0 * 10
-3, and along with the increase of wavelength, birefringence value constantly increases, and can reach 7.168 * 10 at 400 μ m place birefringent characteristics
-3
Can be around the polytetrafluoroethylmaterial material that is filled in terahertz wave band refractive index n=1.37 near 6 airports of fibre core in this routine covering, its refractive index is higher than the refractive index of air, is lower than the refractive index of background material high density polyethylene.As shown in Figure 3 in this routine covering near its birefringent characteristic curve in 100 μ m～400 mu m wavebands behind 6 airport filled polytetrafluoroethylenes of fibre core, to compare when not filling, the effective refractive index difference on the horizontal longitudinal axis reduces, and promptly birefringence level decreases.At 240 μ m place birefringence values is 1.144 * 10
-3, the birefringence value when 400 μ m is 3.493 * 10
-3
Through structural parameters a, b, Λ a, the Λ that adjusts this routine optical fiber
b, Λ
x, Λ
y, can obtain different birefringent characteristic curve maps, can obtain certain the birefringence value terahertz light photonic crystal fiber that has on certain wave band.
The foregoing description is merely concrete example to the object of the invention, technical scheme and beneficial effect further explain, and the present invention is defined in this.All any modifications of within scope of disclosure of the present invention, being made, be equal to replacement, improvement etc., all be included within protection scope of the present invention.
Claims (10)
1. terahertz light photonic crystal fiber, the xsect of this optical fiber is divided into fibre core and covering, it is characterized in that:
Said fibre core is solid background material, and covering is around fibre core, and airport of regular arrangement extends vertically on it; The airport structure of said cross section of optic fibre top covering is identical, and rhombus air element that structure is identical of per 4 airports composition, and a plurality of rhombus air element on the covering are periodic arrangement in background material.
2. terahertz light photonic crystal fiber according to claim 1 is characterized in that:
Said airport is oval airport, and the major axis of oval airport is parallel with the long-diagonal of rhombus air element.
3. terahertz light photonic crystal fiber according to claim 2 is characterized in that:
Said oval airport minor axis a and major axis b than a/b=η, the value of η is 0.5≤η≤1.
4. according to each described terahertz light photonic crystal fiber in the claim 1 to 3, it is characterized in that:
The horizontal diagonal line Λ of said each rhombus air element
aAll equate, vertically diagonal line Λ
bAlso equate 0<Λ
a/ Λ
b≤1.
5. terahertz light photonic crystal fiber according to claim 4 is characterized in that:
The horizontal diagonal line Λ of said each rhombus air element
aWith vertical diagonal line Λ
bRatio satisfy following formula: 0.4≤Λ
a/ Λ
b≤1.
6. according to each described terahertz light photonic crystal fiber in the claim 1 to 3, it is characterized in that:
The shared zone of the fibre core of said solid background material is a shared zone of rhombus air element, and the shared zone of fibre core and other rhombus air element are by the arrangement of same period property.
7. according to each described terahertz light photonic crystal fiber in the claim 1 to 3, it is characterized in that:
The horizontal diagonal line of certain rhombus air element is the center of this rhombus air element with vertical intersection of diagonal in the said covering; The center of same row's rhombus air element is in same straight line, and the horizontal spacing Λ at adjacent rhombus air element center among the same row
xAll equate.Adjacent two rows' rhombus air element staggers, and every interval one arranges longitudinally that the rhombus air element becomes row, and the center of the rhombus air element of same column is in same straight line, and the longitudinal pitch Λ at adjacent rhombus air element center in the same row
yEquate that all the residing straight line mutual spacing in the center of each row rhombus air element equates.
8. terahertz light photonic crystal fiber according to claim 7 is characterized in that:
The horizontal spacing Λ at adjacent rhombus air element center among the said same row
xLongitudinal pitch Λ with rhombus air element center adjacent in the same row
yRatio satisfy following formula:
0.25≤Λ
x/Λ
y≤0.5。
9. according to each described terahertz light photonic crystal fiber in the claim 1 to 3, it is characterized in that:
Have part airport or whole airport in the said covering are filled with the material that refractive index is lower than optical fiber background material refractive index, is higher than air refraction.
10. according to each described terahertz light photonic crystal fiber in the claim 1 to 3, it is characterized in that:
The background material of said optical fiber is a teflon, or tygon, or the polymeric material of polycarbonate.
Priority Applications (1)
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|---|---|---|---|
| CN2012102027391A CN102707374A (en) | 2012-06-19 | 2012-06-19 | Terahertz photonic crystal fiber |
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|---|---|---|---|
| CN2012102027391A CN102707374A (en) | 2012-06-19 | 2012-06-19 | Terahertz photonic crystal fiber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054312A (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 low-loss pohotonic crystal fiber |
| CN110488410A (en) * | 2019-09-09 | 2019-11-22 | 南开大学 | A kind of Terahertz high double-refraction photon crystal fiber based on equal difference layered microstructure |
| CN110794511A (en) * | 2019-11-15 | 2020-02-14 | 燕山大学 | Polarization-maintaining dispersion compensation microstructure optical fiber |
| CN114918548A (en) * | 2022-05-18 | 2022-08-19 | 中南民族大学 | Polytetrafluoroethylene-based two-dimensional photonic crystal and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788695A (en) * | 2009-09-16 | 2010-07-28 | 北京航空航天大学 | High-birefringence sub-wavelength porous T-Hz optical fiber |
| CN202710780U (en) * | 2012-06-19 | 2013-01-30 | 桂林电子科技大学 | Terahertz photonic crystal fiber |
-
2012
- 2012-06-19 CN CN2012102027391A patent/CN102707374A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788695A (en) * | 2009-09-16 | 2010-07-28 | 北京航空航天大学 | High-birefringence sub-wavelength porous T-Hz optical fiber |
| CN202710780U (en) * | 2012-06-19 | 2013-01-30 | 桂林电子科技大学 | Terahertz photonic crystal fiber |
Non-Patent Citations (2)
| Title |
|---|
| M.J.STELL ET AL.: "Polarization and Dispersive Properties of Elliptical-Hole Photonic Crystal Fibers", 《JOURNAL OR LIGHTWAVE TECHNOLOGY》 * |
| 黎薇等: "高对称性模场分布的高双折射光子晶体光纤", 《中国激光》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054312A (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 low-loss pohotonic crystal fiber |
| CN110488410A (en) * | 2019-09-09 | 2019-11-22 | 南开大学 | A kind of Terahertz high double-refraction photon crystal fiber based on equal difference layered microstructure |
| CN110794511A (en) * | 2019-11-15 | 2020-02-14 | 燕山大学 | Polarization-maintaining dispersion compensation microstructure optical fiber |
| CN110794511B (en) * | 2019-11-15 | 2020-09-29 | 燕山大学 | Polarization-maintaining dispersion compensation microstructure optical fiber |
| CN114918548A (en) * | 2022-05-18 | 2022-08-19 | 中南民族大学 | Polytetrafluoroethylene-based two-dimensional photonic crystal and preparation method thereof |
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Application publication date: 20121003 |