CN101089663A - Simple and practical photon crystal optical fibre - Google Patents
Simple and practical photon crystal optical fibre Download PDFInfo
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- CN101089663A CN101089663A CN 200610027610 CN200610027610A CN101089663A CN 101089663 A CN101089663 A CN 101089663A CN 200610027610 CN200610027610 CN 200610027610 CN 200610027610 A CN200610027610 A CN 200610027610A CN 101089663 A CN101089663 A CN 101089663A
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- layering
- inner cladding
- refractive index
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Abstract
A photon crystal optical fiber is prepared as forming fiber core by central ring layer and the first ring layer as well as the second ring layer, setting tightly distributed air-hole layer in substrate material of internal cladding, applying pure SiO2 as fiber core material and SiO2 doped with F as material of cladding substrate and two said ring layers, setting nominal external diameter of coating layer to be 125micron m and 80micro m.
Description
Invention field
The present invention relates to photonic crystal fiber, relate in particular to, a series of simple and practical photonic crystal fibers.
Background technology
Following elder generation provides definition to the term that the present invention relates to, and described definition meets this area convention; This instructions proprietary term illustrates by common terminology.
The radius of each layering of optical fiber is in the μ m of unit, and by the refractive index definition, each particular hierarchical has the first refractive index point and last refractive index point.Radius from shaft axis of optic fibre to the first refractive index point position is the inside radius of this layering; From shaft axis of optic fibre to the end the radius of refractive index point position be the external radius of this layering.Referring to Δ-fiber radius distribution plan, the external radius of the radius of central, circular layering from the shaft axis of optic fibre amount to this layering; The width of the first annular layering is from the external radius of the annular layering of inside radius amount to the first of the first annular layering; The width of the second annular layering is from the external radius of the annular layering of inside radius amount to the second of the second annular layering; The external radius of the width of inner cladding from the inside radius amount of inner cladding to inner cladding.
Central, circular layering, the first annular layering and the second annular layering are about the refractive index contrast Δ of inner cladding base material
0, Δ
1And Δ
2In the % of unit, be defined as respectively
Δ
0＝(n
0 2-n
c1 2)/2n
0 2
Δ
1＝(n
1 2-n
c1 2)/2n
0 2
Δ
2＝(n
2 2-n
c1 2)/2n
0 2
In the formula, n
0The largest refractive index of expression central, circular layering, n
1And n
2The homogeneous refractive index of representing the first annular layering and the second annular layering respectively; n
C1The homogeneous refractive index of expression inner cladding base material.
Refractive index profile is defined as the relation between refractive index contrast or refractive index and the radius.
The α refractive index profile is defined as
Δ
co(r)＝Δ
0[1-(r/a)
α]，0≤r≤a
Wherein, r is the present position radius; A is the radius of described central, circular layering.
Chromatic dispersion coefficient abbreviates chromatic dispersion as in the ps/nm-km of unit.
Useful area is with the μ m of unit
2Meter is defined as
A
eff＝2π(∫E
2(r)r dr)
2/(∫E
4(r)r dr)
Wherein, integration is limited to 0 to ∞; E (r) is that light is propagated the electric field of being followed.
Decay-the wavelength characteristic of quartz material shows, about 1300～1700nm wavelength coverage is that optical fiber communication can applicable ideal zone; Yet the all-wave single-mode fiber in the above-mentioned wavelength coverage is never realized.This is because the all-wave single-mode fiber not only requires main performances such as chromatic dispersion, decay, non-linear, useful area and mode field diameter to satisfy practical requirement, and requires performance such as chromatic dispersion also to satisfy practical requirement about the stability that structural parameters change.Existing fiber shows typical weak guide structure characteristic, and above-mentioned every optical fiber property is attended to one thing and lose sight of another.People are sent in the photonic crystal fiber of great expectations, and its periodic crystal structure is not only complicated, and unreasonable, is difficult to practical application.
Applicant has found that the decay of optical fiber leaky mode produces and the rule of control, and the rule that develops of its dispersion characteristics of optical fiber of forming of fibre core and different limited covering and chromatic dispersion stability, uses these rules and has invented simple and practical photonic crystal fiber.
Simple and practical photonic crystal fiber involved in the present invention comprises fibre core, inner cladding and surrounding layer.Described fibre core comprise with the shaft axis of optic fibre be the center of circle the central, circular layering, be coated on the first annular layering in the described central, circular layering and be coated on the second annular layering in the described first annular layering.Described central, circular layering is a Δ about the refractive index contrast of described inner cladding base material
0, radius is a; The described first annular layering is a Δ about the refractive index contrast of described inner cladding base material
1, width is H
1The described second annular layering is a Δ about the refractive index contrast of described inner cladding base material
2, width is H
2I=1～3 layer of air holes distribute in described inner cladding base material; The described i layer of air bore dia that is distributed on i the circumference is d
i, distance is Λ between the center of circle
iDescribed i circumference is H with respect to the radial displacement of described i-1 circumference
3i, described the 1st circumference is H with respect to the radial displacement of the described second annular layering external radius
31Described inner cladding width is H
4Described central, circular layering is the α refractive index profile basically, and in fact described α refractive index profile becomes the step change type refractive index profile when α 〉=100; The refractive index of the described first annular layering, the described second annular layering and described inner cladding base material all is uniform basically; Described surrounding layer is by pure SiO
2Form, refractive index is uniform.
Described simple and practical photonic crystal fiber need not periodic crystal structure, is characterized at inner cladding that contains airport of fibre core outside best configuration.The characteristics of described fibre core are to produce the leaky mode decay, realize the broadband unimodular property, increase useful area; Described fibre core and the described best configuration that contains the inner cladding of airport can reduce additional attenuation in the decay of broadband inner control leaky mode, improve CHROMATIC DISPERSION IN FIBER OPTICS characteristic and chromatic dispersion stability.
Summary of the invention
Comprise that with existing various optical fiber having various photonic crystal fibers now compares, the simple and practical photonic crystal fiber of inventing has following characteristics:
---compare with existing weakly guiding optical fiber, contain the inner cladding of airport in fibre core outside best configuration;
---the characteristics of described fibre core are, produce needed leaky mode decay, realize the broadband unimodular property, increase useful area:
---compare with existing photonic crystal fiber, the airport that distributes in the described inner cladding base material is not the periodicity crystal arrangement, but closely arranges;
---described fibre core and described inner cladding best configuration, both can be in the decay of broadband inner control leaky mode, the tangible added losses of unlikely generation can improve dispersion characteristics and chromatic dispersion stability again;
---therefore simple in structure, the performance practicality.
Description of drawings
With reference to the following drawings, those skilled in the art that, from detailed description of the present invention, above-mentioned and other purposes will be apparent of the present invention, feature and advantage.
Fig. 1 is the synoptic diagram of a kind of refractive index profile of institute's invention fiber core and a part of inner cladding base material.Described α refractive index profile changes to α 〉=100 from α=5, can't draw one by one, just wherein a kind of situation shown in Figure 1; Only the draw homogeneous refractive index of base material of described inner cladding refractive index, in the wherein said airport can't draw in proportion in the refractive index n of air=1; The part of airport layer outside does not have substantial effect for the Optical Fiber Transmission performance in the described inner cladding, does not all draw, and shown in Figure 1 is the part of described inner cladding.
Embodiment
Among Fig. 1,1,2,3 and 4 represent the part of central, circular layering, the first annular layering, the second annular layering and the described inner cladding base material of described optical fiber respectively, and 5,6 and 7 represent central, circular layering radius a, the first annular layering width H respectively
1With the second annular layering width H
2, n
0The largest refractive index of representing described central, circular layering, n
1And n
2The homogeneous refractive index of representing the described first annular layering and the described second annular layering respectively, n
C1The refractive index of representing described inner cladding base material.
A kind of simple and practical photonic crystal fiber involved in the present invention, in the 1625nm wavelength coverage, chromatic dispersion is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EffBe not less than 50 μ m
2
A kind of simple and practical photonic crystal fiber involved in the present invention, in the 1700nm wavelength coverage, chromatic dispersion is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EffBe not less than 50 μ m
2
A kind of simple and practical photonic crystal fiber involved in the present invention adopts pure SiO
2Described central, circular layering and mix fluorine SiO
2The described first annular layering, the described second annular layering and described inner cladding base material, both can reduce central, circular layering decay, can cut down the decay water peak of 1365nm near zone again, OH in the separation layer blocks air hole is set
-Diffusion, in the all-wave scope, keep lower decay.
Various simple and practical photonic crystal fiber involved in the present invention, the nominal overall diameter of coat also can be made and be not less than 80 μ m, to improve the performances such as reliability of optical fiber except that making 125 μ m.
Table 1 provides the main structure parameters of a kind of preferred embodiment of simple and practical photonic crystal fiber fibre core of inventing.
Table 1
| Structural parameters | Index |
| The fiber core refractive index sectional parameter | α≥5 |
| Fibre core refractive index contrast % | Δ 0＝0.30～0.60 |
| Fiber core radius μ m | a＝2.80～6.30 |
| The first annular layering refractive index contrast % | Δ 1＝-0.15～-0.34 |
| The first annular layering width μ m | H 1＝2.60～6.00 |
| The second annular layering refractive index contrast % | Δ 2＝0.14～0.33 |
| The second annular layering width μ m | H 2＝4.40～10.00 |
Table 2 provides the main structure parameters of a kind of preferred embodiment of simple and practical photonic crystal fiber inner cladding of inventing, and described structural parameters are corresponding to the following performance of optical fiber: in the 1700nm wavelength coverage, chromatic dispersion is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EffBe not less than 50 μ m
2
Table 2
| Structural parameters | Index |
| The 1st layer of air bore dia μ m | d 1≤1.0 |
| The 1st layer of air pitch of holes μ m | Λ 1≤1.5 d 1 |
| The 1st layer of air hole circle heart radial displacement m | H 31＝d 1+1.00～4.00 |
| The 2nd layer of air bore dia μ m | d 2≤1.0 |
| The 2nd layer of air pitch of holes μ m | Λ 2≤1.5 d 2 |
| The 2nd layer of air hole circle heart radial displacement m | H 32＝d 2+1.00～4.00 |
Table 3 provides the main structure parameters of a kind of preferred embodiment of simple and practical photonic crystal fiber inner cladding of inventing, and described structural parameters are corresponding to following optical fiber property: in the 1625nm wavelength coverage, chromatic dispersion is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EffBe not less than 50 μ m
2
Table 3
| Structural parameters | Index |
| The 1st layer of air bore dia μ m | d 1≤1.0 |
| The 1st layer of air pitch of holes μ m | Λ 1≤1.5 d 1 |
| The 1st layer of air hole circle heart radial displacement m | H 31＝d 1+0.50～1.50 |
| The 2nd layer of air bore dia μ m | d 2≤1.0 |
| The 2nd layer of air pitch of holes μ m | Λ 2≤1.5 d 2 |
| The 2nd layer of air hole circle heart radial displacement m | H 32＝d 2+0.50～1.50 |
In fact the optical fibre refractivity section can be made up of the multilayer deposition; The deposition number of plies is different because of manufacture method, and which floor arrives the hundreds of layer more at least.The smooth refractive index profile of central, circular layering can be regarded the limiting case of infinite multilayer step change type refractive index profile as.
Because technological reason optical fibre refractivity section has little central concave near axis.Those skilled in the art know that little central concave can not have a strong impact on the optical fiber key property.Can be not-time when the described central concave degree of depth and all very little its influence of inverted-cone shape bottom surface radius, can regard limiting case as and not have central concave.
The refractive index profile of described central, circular layering is the α refractive index profile basically, comprises other similar refractive index profiles of the optical transmission performance close to this section.The described first annular layering, the described second annular layering and described inner cladding base material are uniformly basically, comprise optical transmission performance similar approach other refractive index profiles uniformly.
Institute's column data is corresponding to following condition in the table: described central, circular layering has smooth α refractive index profile, no central concave, the refractive index profile of described other each layerings and each covering is desirable step change type refractive index profile, when actual conditions and described condition were variant slightly, relevant data and tabular corresponding data were slightly different.
Simple and practical photonic crystal fiber involved in the present invention according to the principle that the inventor found, produces and the decay of control leaky mode, realizes the broadband unimodular property, increases useful area, reduces additional attenuation, improves CHROMATIC DISPERSION IN FIBER OPTICS characteristic and chromatic dispersion stability.These characteristics make institute's invention optical fiber be different from existing various optical fiber to comprise existing various photonic crystal fibers.
The front provides the description to preferred embodiment, so that any technician in this area can use or utilize the present invention.Various modifications to these embodiment are conspicuous to those skilled in the art, can be applied to other embodiment to total principle described here and not use creativeness.Thereby, the embodiment shown in the present invention will be not limited to here, and the wide region of principle that should disclose and new feature according to meeting here.
Claims (10)
1, a kind of simple and practical photonic crystal fiber comprises a fibre core, an inner cladding and a surrounding layer that is coated on the described inner cladding that is coated on the described fibre core.Described fibre core comprise with the shaft axis of optic fibre be the center of circle the central, circular layering, be coated on the first annular layering in the described central, circular layering and be coated on the second annular layering in the described first annular layering.Described central, circular layering is a Δ about the refractive index contrast of described inner cladding base material
0, radius is a; The described first annular layering is a Δ about the refractive index contrast of described inner cladding base material
1, width is H
1The described second annular layering is a Δ about the refractive index contrast of described inner cladding base material
2, width is H
2I=1～3 layer of air holes distribute in described inner cladding base material; The described i layer of air bore dia that is distributed on i the circumference is d
i, distance is Λ between the center of circle
iDescribed i circumference is H with respect to the radial displacement of described i-1 circumference
3i, described the 1st circumference is H with respect to the radial displacement of the described second annular layering external radius
3iDescribed inner cladding width is H
4Described central, circular layering is the α refractive index profile basically, and in fact described α refractive index profile becomes the step change type refractive index profile when α 〉=100; The refractive index of the described first annular layering, the described second annular layering and described inner cladding base material all is uniform basically; Described surrounding layer is by pure SiO
2Form, refractive index is uniform.Described optical fiber is characterised in that:
The described first annular layering Δ
1＜0;
The described second annular layering Δ
2＞0;
Described inner cladding i=1～3, H
3i=0.50～4.00 μ m, d
i＜1.0 μ m, Λ
i＜1.5d
i
2, optical fiber according to claim 1 is characterized in that:
Described central, circular layering α 〉=5, Δ
0=0.30～0.60%, a=2.80～6.30 μ m.
3, optical fiber according to claim 2 is characterized in that:
The described first annular layering H
1=2.60～6.00 μ m, Δ
1=-0.15～-0.34%;
4, optical fiber according to claim 3 is characterized in that:
The described second annular layering H
2=4.00～10.00 μ m, Δ
2=0.14～0.33%.
5, optical fiber according to claim 4 is characterized in that:
Described inner cladding i=1, d
1＜1.0 μ m, Λ
1＜1.5d1, H
31=d
1+ 0.50～1.50 μ m;
In the 1625nm wavelength coverage, chromatic dispersion D is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EfBe not less than 50 μ m
2
6, optical fiber according to claim 4 is characterized in that:
Described inner cladding i=1, d
1＜1.0 μ m, Λ
1＜1.5 d
1, H
31=d
1+ 1.00～4.00 μ m.
In the 1700nm wavelength coverage, chromatic dispersion D is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EfBe not less than 50 μ m
2
7, optical fiber according to claim 4 is characterized in that:
Described inner cladding i=2, d
1＜1.0 μ m, Λ
1＜1.5 d
1, H
31=d
1+ 0.50～1.50 μ m;
d
2＜1.0μm，Λ
2＜1.5 d
1，H
32＝d
1+0.50～1.50μm。
In the 1625nm wavelength coverage, chromatic dispersion D is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EfBe not less than 50 μ m
2
8, optical fiber according to claim 4 is characterized in that:
Described inner cladding i=2, d
1＜1.0 μ m, Λ
1＜1.5 d
1, H
31=d
1+ 1.00～4.00 μ m;
d
2＜1.0μm，Λ
2＜1.5 d
1，H
32＝d
2+1.00～4.00μm。
In the 1700nm wavelength coverage, chromatic dispersion D is being for just at 1300nm, maximum chromatic dispersion D
MaxBe not more than 15ps/nm-km, useful area A
EffBe not less than 50 μ m
2
9, according to claim 5 or claim 6 or claim 7 or the described optical fiber of claim 8, it is characterized in that:
Described central, circular layering is by pure SiO
2Form the step change type refractive index profile;
The described first annular layering, the described second annular layering and described inner cladding base material are all by mixing fluorine SiO
2Form the step change type refractive index profile.
10, according to claim 5 or claim 6 or claim 7 or the described optical fiber of claim 8, it is characterized in that the coating diameter is not less than 80 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610027610 CN101089663A (en) | 2006-06-13 | 2006-06-13 | Simple and practical photon crystal optical fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610027610 CN101089663A (en) | 2006-06-13 | 2006-06-13 | Simple and practical photon crystal optical fibre |
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| Publication Number | Publication Date |
|---|---|
| CN101089663A true CN101089663A (en) | 2007-12-19 |
Family
ID=38943086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610027610 Pending CN101089663A (en) | 2006-06-13 | 2006-06-13 | Simple and practical photon crystal optical fibre |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513327A (en) * | 2013-09-11 | 2014-01-15 | 江苏南方通信科技有限公司 | Bent and insensitive multimode optical fiber and manufacturing method thereof |
| CN104062704A (en) * | 2014-06-13 | 2014-09-24 | 中国科学院西安光学精密机械研究所 | Microstructured optical fiber for generating and transmitting vortex light beam |
| CN108345061A (en) * | 2018-02-05 | 2018-07-31 | 广东南方电力通信有限公司 | A kind of energy optical fiber and end connector applied to superhigh voltage DC measuring system |
-
2006
- 2006-06-13 CN CN 200610027610 patent/CN101089663A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513327A (en) * | 2013-09-11 | 2014-01-15 | 江苏南方通信科技有限公司 | Bent and insensitive multimode optical fiber and manufacturing method thereof |
| CN103513327B (en) * | 2013-09-11 | 2016-01-27 | 江苏南方通信科技有限公司 | A kind of method for making of bend-insensitive multimode optical fiber |
| CN104062704A (en) * | 2014-06-13 | 2014-09-24 | 中国科学院西安光学精密机械研究所 | Microstructured optical fiber for generating and transmitting vortex light beam |
| CN108345061A (en) * | 2018-02-05 | 2018-07-31 | 广东南方电力通信有限公司 | A kind of energy optical fiber and end connector applied to superhigh voltage DC measuring system |
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