CN105511014A - Porous core photonic crystal optical fiber for transmitting light through nanometer air holes - Google Patents
Porous core photonic crystal optical fiber for transmitting light through nanometer air holes Download PDFInfo
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- CN105511014A CN105511014A CN201610039667.1A CN201610039667A CN105511014A CN 105511014 A CN105511014 A CN 105511014A CN 201610039667 A CN201610039667 A CN 201610039667A CN 105511014 A CN105511014 A CN 105511014A
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- airport
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- light
- photonic crystal
- air holes
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- 239000004038 photonic crystal Substances 0.000 title claims abstract description 26
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 81
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000010453 quartz Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000003491 array Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 description 16
- 238000009826 distribution Methods 0.000 description 8
- 238000011160 research Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
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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
A porous core photonic crystal optical fiber for transmitting light through nanometer air holes is composed of the fiber core air holes, the wrapping layer air holes and a base material. At least one fiber core air hole is machined in the center of the base material to form a fiber core part. The wrapping layer air holes are machined in the portion, around the fiber core part, of the base material to form a wrapping layer part. The wrapping layer air holes are machined according to a regular hexagonal multi-layer dense array structure, and the hole distances of the wrapping layer air holes are equal. The aperture of the wrapping layer air holes is larger than that of the fiber core air holes. The air filling rate of the fiber core part is smaller than that of a wrapping layer. The equivalent refractive index of the fiber core part is larger than that of the wrapping layer. The optical fiber has the advantages of low loss and wideband transmission, and the air holes have coherence and can be coupled with one another when light is tansmitted.
Description
Technical field
The present invention relates to hollow-core photonic crystal fiber technical field, especially a kind of nanometer airport passes the multi-hole center photonic crystal fiber of light.
Background technology
Based in traditional optical waveguide of total internal reflection principle, light can not transmit at the low-index material middle and long distance that air is such.Although by the reflection of multilayered medium or photonic crystal, can realize the optical transport of low refractive index dielectric, this structured optical fiber can only transmit specific wavelength, and mode field area comparatively conference cause light intensity decreasing.
The research appearing as optical field of photonic crystal fiber is filled with new vitality, it is a kind of novel optical fiber got up based on photonic crystal technical development, its covering is made up of at the wavelength magnitude airport that axial arrangement is constant close-packed arrays on two-dimensional directional in matrix, fibre core has one to destroy the periodic defect formation of covering, the quartz material of normally different from the covering size of this defect or airport.Photonic crystal fiber presents the characteristic that many traditional fiber are difficult to realize, as large mode area unimodular property, high non-linearity, dispersion adjustability, photon band gap, high birefringence characteristic etc., thus receive extensive concern, become a focus of optics and optoelectronics research in recent years.
The widespread use all in optical communication, sensing and Energy Transfer etc. of optical waveguide from micron to mm dia, very many-sided application is also had to need to reduce the diameter of optical waveguide, but because accuracy requirement is higher, the optical waveguide of preparation low-loss, nanoscale is very difficult.Recently, prepared the optical fiber of sub-micron and nanoscale, the nano optical fibers that these diameters are less than a micron is that 1/tens of conventional micro-meter scale optical fiber arrives a few per mille.They can be used as the line waveguide of the nanometer diameter of air cladding layer, also may be used for the photonic device of micron or nanoscale.
The transport properties of these real core fibres has had a lot of research, but the research of the transport properties of hollow-core fiber also seldom.It is produce due to the electric field difference of the very large material interface of two kinds of refringences that initial light transmits in low-index material, but its loss is higher, can only apply within the scope of a few centimetre length.On the other hand, hollow core photonic bandgap type optical fiber can pass light in air-core, and loss is very low, but this optical fiber can only transmit the light of specific wavelength, and air-core comparatively large (about 10 μm), cause light intensity to reduce, limit its application.The K.Saitoh of Japan and people's theoretical modeling such as the French B.Kibler photonic crystal fiber transmission transport property of core centre with micro air-holes, obtain this optical fiber and there is the characteristics such as dispersion flattene, low-loss, little mode field area, Dispersion managed, Propagation of Soliton and non-linear in there is using value, but this optical fiber is the quartz material biography light in fibre core, and center air hole does not have light distribution.
Real core photonic crystal fiber can make high light transmit at small fibre core middle and long distance, but when core diameter reduces further, light transmits the restriction being finally subject to diffraction in the waveguide, and diffraction makes light scatter out from high index of refraction fibre core.Experiment afterwards proves that this scattered light by the micro air-holes of nanoscale in local to fibre core, can be formed strengthening evanscent field, can be less than in the nanometer air hole of 200nm and transmit, and loss is very low in the fibre core of photonic crystal fiber.In photonic crystal fiber fibre core, introduce multiple nanometer and airport, can obtain the optical transport in airport equally, light is high strength, long range propagation in airport, can provide new condition for light and the interaction of material and the research of nonlinear optics.
Summary of the invention
The object of the invention be to provide a kind of limitation loss little, do not pass the multi-hole center photonic crystal fiber of light by photon band gap restriction, optical intensity density nanometer airport that is large, nanometer air hole long range propagation.
For achieving the above object, have employed following technical scheme: optical fiber of the present invention is made up of fibre core airport, covering airport and host material three part; Process at least one fibre core airport at the center of host material and form core segment; In host material, form clad section around core segment processing covering airport, covering airport is processed according to regular hexagon multilayer close-packed arrays structure, and the pitch-row of covering airport is equal; The aperture of covering airport is greater than the aperture of fibre core airport; The air filling fraction of core segment is less than the air filling fraction of covering, and the equivalent refractive index of core segment is greater than covering equivalent refractive index.
Further, the aperture of described fibre core airport is 100 ~ 800nm.
Further, described multiple fibre core airport can adopt in-line or triangle or hexagonal arrangement architecture.
Further, the aperture of described covering airport is 1000 ~ 3000nm.
Further, the number of plies of described covering airport is 4 ~ 10 layers.
Further, described host material is the quartz of column or glass or polymeric material.
Compared with prior art, tool of the present invention has the following advantages:
1, the multiple low-refraction airport of fibre core can pass light simultaneously, limitation loss can be less than 0.01dB/m.
2, by the suitable fibre core of design and covering airport filling rate, single mode, wideband transmit can be obtained, do not limit by photon band gap.
3, because airport is very little, optical intensity density can be very large.
4, the close together between airport, multiple airport passes light and has coherence, and can intercouple.
Accompanying drawing explanation
Fig. 1 is end face structure figure of the present invention.
Fig. 2 is the structural drawing of core segment of the present invention.
Fig. 3 is the mode distributions figure of 7 nanoscale fibre core airports of core segment of the present invention.
Fig. 4 is the variation diagram of light intensity ratio with wavelength that the light intensity of airport part accounts for total fiber end face.
Fig. 5 is the variation diagram of optical fiber limitation loss with wavelength.
Fig. 6 is the mode distributions figure of 19 nanoscale fibre core airports of core segment of the present invention.
Drawing reference numeral: 1-host material; 2-covering airport; 3-fibre core airport; The pitch-row of Λ-covering airport; The aperture of d-covering airport; Λ
cthe pitch-row of-fibre core airport; d
cthe aperture of-fibre core airport.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As illustrated in fig. 1 and 2, described optical fiber is made up of fibre core airport 3, covering airport 2 and host material 1 three part; Using the quartz substrate of column as host material, process at least one fibre core airport at the center of host material and form core segment; In host material, form clad section around core segment processing covering airport, covering airport is processed according to regular hexagon multilayer close-packed arrays structure, and the pitch-row of covering airport is equal; The aperture of covering airport is greater than the aperture of fibre core airport; The air filling fraction of core segment is less than the air filling fraction of covering, and the equivalent refractive index of core segment is greater than covering equivalent refractive index.
Core segment is in pure quartz material, introduce the identical circular core airport of 7 sizes, and fibre core airport becomes hexagonal symmetry to arrange, the diameter d of fibre core airport
cfor 500nm, the pitch-row Λ of fibre core airport
cfor 560nm.Extramural cladding is that the microstructure formed according to sexangle multilayer close-packed arrays by some covering airports in pure quartz material is formed, and the covering airport number of plies is 8 layers, and the covering airport diameter d in covering is 1500nm, and the pitch-row Λ of covering airport is 1600nm.
The air filling fraction of core segment is slightly less than the air filling fraction of covering, and the equivalent refractive index of fibre core is slightly larger than covering equivalent refractive index, form the photonic crystal fiber based on total internal reflection transmission, by airport size and the spacing of appropriate design fibre core and covering, optical fiber single mode transport can be ensured.And Finite Element Method can be adopted to carry out theory calculate, obtain multi-hole center optical fiber mode fields distribution character of the present invention and loss characteristic.
At communication band 1550nm wavelength, as shown in Figure 3, figure comprises circular airport and distributes with the boundary line of quartz, the equipotential layer of mould field strength the core region mode distributions of 7 hole core photonic crystal fibers of the present invention.As can be seen from the figure, the light distribution in fibre core airport is comparatively even, and the optical intensity density in fibre core airport region can be greater than the optical intensity density of fibre core quartz areas.By calculating, 850-1600nm wavelength coverage, in fibre core airport, light intensity accounts for the ratio of the total light intensity of total fiber end face as shown in Figure 4, and the light intensity in fibre core airport region and the ratio of the total light intensity of fiber end face are within the scope of 31%-39%.
Fig. 5 represents the Changing Pattern of limitation loss with wavelength of 7 hole core photonic crystal fibers of 8 layers of covering airport of the present invention.Within the scope of 1100-1600nm, limitation loss is all less than 0.01dB/m.And optical fiber is single mode transport.
When the diameter d of fibre core airport
cfor 500nm, the pitch-row Λ of fibre core airport
cfor 560nm, the diameter d of covering airport is 1500nm, and when the pitch-row Λ of covering airport is 1600nm, multi-hole center photonic crystal fiber of the present invention low-loss, broadband single mode transport scope are 1100-1600nm.By zooming in or out of optical fiber structure parameter, the centre wavelength of transmission light also can scale up or reduce.
Fig. 6 is the core segment mode distributions figure of the photonic crystal fiber comprising 19 fibre core airports in fibre core, and the light distribution of fibre core airport is comparatively even, and optical intensity density is comparatively large, obtains multiple nanometer air hole equally and passes light.The quantity of fibre core airport can be any number, can obtain similar airport and pass light effect.
Due to its special biography optical physics mechanism, fibre core airport high strength, long distance can pass light, for the interaction of light and material and nonlinear optics provide new condition.(1) for the research of light sensing aspect provides new way, significantly sensing sensitivity is improved.CH is filled with in the fibre core airport of photonic crystal fiber
4, SO
2, NO
2, CO
2deng material, utilize airport to pass light, carry out the spectrum sensing research of the aspects such as environment, biology, chemistry.(2) in the fibre core airport of fibre core nanometer scale, pour active medium, nonlinear material, the long distance of high light and filler interacts, and can carry out the research of the aspects such as Laser Transmission, atomic excitation, nonlinear optics communication device.(3) physical essence of low-refraction nanometer airport biography light is studied, analyze the pattern of light in airport and the state of existence, analyze its small-size effect, quantum effect, surface effect and interfacial effect, obtain the special optical performance that common material does not have, as light absorption, energy loss, light reflection and optical nonlinearity etc.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (6)
1. nanometer airport passes a multi-hole center photonic crystal fiber for light, it is characterized in that: described optical fiber is made up of fibre core airport, covering airport and host material three part; Process at least one fibre core airport at the center of host material and form core segment; In host material, form clad section around core segment processing covering airport, covering airport is processed according to regular hexagon multilayer close-packed arrays structure, and the pitch-row of covering airport is equal; The aperture of covering airport is greater than the aperture of fibre core airport; The air filling fraction of core segment is less than the air filling fraction of covering, and the equivalent refractive index of core segment is greater than covering equivalent refractive index.
2. a kind of nanometer airport according to claim 1 passes the multi-hole center photonic crystal fiber of light, it is characterized in that: the aperture of described fibre core airport is 100 ~ 800nm.
3. a kind of nanometer airport according to claim 1 passes the multi-hole center photonic crystal fiber of light, it is characterized in that: described multiple fibre core airport can adopt in-line or triangle or hexagonal arrangement architecture.
4. a kind of nanometer airport according to claim 1 passes the multi-hole center photonic crystal fiber of light, it is characterized in that: the aperture of described covering airport is 1000 ~ 3000nm.
5. a kind of nanometer airport according to claim 1 passes the multi-hole center photonic crystal fiber of light, it is characterized in that: the number of plies of described covering airport is 4 ~ 10 layers.
6. a kind of nanometer airport according to claim 1 passes the multi-hole center photonic crystal fiber of light, it is characterized in that: described host material is the quartz of column or glass or polymeric material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610039667.1A CN105511014B (en) | 2016-01-21 | 2016-01-21 | A kind of nanometer of airport passes the porous core photonic crystal fiber of light |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610039667.1A CN105511014B (en) | 2016-01-21 | 2016-01-21 | A kind of nanometer of airport passes the porous core photonic crystal fiber of light |
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| CN105511014B CN105511014B (en) | 2019-05-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054311A (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 composite pohotonic crystal fiber |
| CN107490820A (en) * | 2017-10-13 | 2017-12-19 | 燕山大学 | A kind of flat microstructured optical fibers of nearly zero dispersion of all solid state large mode area |
| CN108459370A (en) * | 2018-03-09 | 2018-08-28 | 华南理工大学 | It is a kind of using quartz glass as matrix photon band gap in dirac point photonic crystal fiber |
| CN109581580A (en) * | 2018-12-12 | 2019-04-05 | 桂林电子科技大学 | A kind of fiber bragg grating device based on hollow-core photonic crystal fiber |
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2016
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054311A (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 composite pohotonic crystal fiber |
| CN106054311B (en) * | 2016-08-15 | 2023-08-22 | 中国工程物理研究院激光聚变研究中心 | High-birefringence composite photonic crystal fiber |
| CN107490820A (en) * | 2017-10-13 | 2017-12-19 | 燕山大学 | A kind of flat microstructured optical fibers of nearly zero dispersion of all solid state large mode area |
| CN107490820B (en) * | 2017-10-13 | 2020-02-25 | 燕山大学 | All-solid-state large-mode-area near-zero dispersion flat microstructure optical fiber |
| CN108459370A (en) * | 2018-03-09 | 2018-08-28 | 华南理工大学 | It is a kind of using quartz glass as matrix photon band gap in dirac point photonic crystal fiber |
| CN108459370B (en) * | 2018-03-09 | 2020-01-14 | 华南理工大学 | Photonic crystal fiber with Dirac point in photonic band gap by taking quartz glass as matrix |
| CN109581580A (en) * | 2018-12-12 | 2019-04-05 | 桂林电子科技大学 | A kind of fiber bragg grating device based on hollow-core photonic crystal fiber |
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| CN105511014B (en) | 2019-05-03 |
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