CN101169497A - Full-wave nonzero dispersion flat single-mode optical fiber - Google Patents
Full-wave nonzero dispersion flat single-mode optical fiber Download PDFInfo
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- CN101169497A CN101169497A CNA2006101174237A CN200610117423A CN101169497A CN 101169497 A CN101169497 A CN 101169497A CN A2006101174237 A CNA2006101174237 A CN A2006101174237A CN 200610117423 A CN200610117423 A CN 200610117423A CN 101169497 A CN101169497 A CN 101169497A
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- refractive index
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Abstract
The invention relates to a complete wave nonzero dispersive flat single mode optical fiber, which comprises a fiber core circular shaped center delamination, a first ring-shaped delamination, a second ring-shaped delamination and a uniform outer cladding. The refractive index of the first ring-shaped delamination is lower than that of the uniform outer cladding. The optimum choose of the refractive index section shape of each delamination, relative refractive index difference and semidiameter or width can guarantee that the chromatic dispersion is between 0.1ps/nm-km and 12.0ps/nm-km in a wavelength range of 1300nm to 1625nm. The valid section Aeff is more than or equel to 50 square micrometers under the condition that the wavelength is 1550nm. The performance of the optical fiber can be changed in different intervals in the range according to the different requirements of communicating systems such as DWDM and CWDM.
Description
Invention field
The present invention relates to the all-wave single-mode fiber, relate in particular to, full-wave nonzero dispersion flat single-mode optical fiber.
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 radius from the shaft axis of optic fibre amount to this layering of fibre core central, circular 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 layering of fibre core central, circular, the first annular layering and the second annular layering are about the refractive index contrast Δ of described surrounding layer
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 fibre core 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 surrounding layer.
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 fibre core central, circular layering.
Chromatic dispersion coefficient abbreviates chromatic dispersion as in the ps/nm-km of unit.
Free 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.
Early stage Dispersion Flattened Fiber, dispersion characteristics are stable very poor about the structural parameters variation, and manufacturing tolerance requires very tight, though through the research of three more than ten years, always can not practical application.
The non-zero dispersion displacement optical fiber of widespread use, the single mode operation wavelength coverage is little, communication system dispersion compensation cost height.
Nearest reduced slope fiber, the single mode operation wavelength coverage is wide inadequately, and the free area face is less than normal, does not meet practical requirement.
The photonic crystal fiber of being placed high hopes requires periodic hollow capillary pipe structure, and practical application need solve series of theories and practical problems.
In a word, existing various single mode telecommunication optical fibers leave the all-wave single-mode fiber that makes full use of the low decay of silica fibre wavelength coverage quite big gap.
Summary of the invention
The objective of the invention is: the above-mentioned shortcoming that overcomes existing Dispersion Flattened Fiber, non-zero dispersion displacement optical fiber, reduced slope fiber and photonic crystal fiber, provide a kind of optical fiber simple, popular, that make full use of the low decay of silica fibre wavelength coverage, i.e. full-wave nonzero dispersion flat single-mode optical fiber.
As a kind of simple, popular optical fiber, full-wave nonzero dispersion flat single-mode optical fiber involved in the present invention comprises the layering of fibre core central, circular, be coated on the first annular layering in the layering of described fibre core central, circular, be coated on the second annular layering and even surrounding layer in the described first annular layering.The layering of described fibre core central, circular is a Δ about the refractive index contrast of described surrounding layer
0, radius is a; The described first annular layering is a Δ about the refractive index contrast of described surrounding layer
1, width is H
1The described second annular layering is a Δ about the refractive index contrast of described surrounding layer
2, width is H
2The layering of described fibre core central, circular 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 surrounding layer all is uniform basically.The described first annular layering Δ
1＜0; The described second annular layering Δ
2＞0.
The feature of institute's invention full-wave nonzero dispersion flat single-mode optical fiber is: the single mode operation wavelength coverage is wide, dispersion characteristics are smooth, chromatic dispersion maximal value and minimum value gap are little, have surmounted various existing fibers up to now, approach the theoretical limit of silica fibre under the existence conditions.
The main performance index of institute's invention full-wave nonzero dispersion flat single-mode optical fiber is:
---in the 1625nm wavelength coverage and under the manufacturing tolerance commonly used, chromatic dispersion is greater than 0.1ps/nm-km, less than 12.0ps/nm-km at 1300nm.
---under the 1550nm wavelength, free area is not less than 50 μ m
2
Other performances of optical fiber satisfy existing international standard requirement.
In order to realize purpose of the present invention, the patent applicant has studied the series of theories problem, has developed corresponding optical fiber designs method.The theory that is proposed comprises: the chromatic dispersion stability theory; Leaky mode calculation of attenuation method in the complex field; The broadband unimodular property theory of depressed cladding fiber, depressed clad fiber; Simplify the photonic crystal fiber theory.Corresponding optical fiber designs method comprises: based on the optimal design of the smooth dispersion characteristics of all-wave of chromatic dispersion stability theory; Optimal design based on the depressed cladding fiber, depressed clad fiber broadband unimodular property of leaky mode decay computing method in the complex field; Simplify the optimal design of photonic crystal fiber.Described theory and method for designing are applied to described depression section triply coated fiber,, calculate structural parameters, design desired full-wave nonzero dispersion flat single-mode optical fiber according to the performance index that proposed.
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 optical fiber.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.
Embodiment
Among Fig. 1,1,2,3 and 4 represent the layering of fibre core central, circular, the first annular layering, the second annular layering and the surrounding layer of described optical fiber respectively, and 5,6,7 and 8 represent fibre core 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 the layering of described fibre core central, circular, n
1And n
2The homogeneous refractive index of representing the described first annular layering and the described second annular layering respectively, n
C1The homogeneous refractive index of representing described surrounding layer.The refractive index of the described first annular layering, the described second annular layering and described surrounding layer all is uniform basically.The described first annular layering Δ
1＜0; The described second annular layering Δ
2＞0.
Table 1 provides the main structure parameters of a kind of preferred embodiment of institute's invention full-wave nonzero dispersion flat single-mode optical fiber.
Table 1
| Structural parameters | Index |
| Fibre core central, circular layering refractive index profile parameter | α≥5 |
| Fibre core central, circular layering refractive index contrast % | 0.39～0.74 |
| Fibre core central, circular layering radius μ m | 3.26～5.60 |
| The first annular layering refractive index contrast % | -0.12～-1.08 |
| The first annular layering width μ m | 1.72～5.27 |
| The second annular layering refractive index contrast % | 0.28～0.80 |
| The second annular layering width μ m | 2.96～10.00 |
Being applicable to the full-wave nonzero dispersion flat single-mode optical fiber of DWDM communication system, is a kind of special case of optical fiber involved in the present invention.Its main performance feature is: in the 1625nm wavelength coverage, 2.0ps/nm-km≤D≤11.0ps/nm-km is satisfied in chromatic dispersion at 1300nm; Under the 1550nm wavelength, free area is not less than 55 μ m
2Its primary structure feature is: pure SiO
2Described fibre core central, circular layering (being equivalent to α 〉=100) and doping SiO
2The described first annular layering and described. the second annular layering.Table 2 provides the main structure parameters of a kind of preferred embodiment of described optical fiber.
Table 2
| Structural parameters | Index |
| Fibre core central, circular layering refractive index contrast % | 0.49～0.68 |
| Fibre core central, circular layering radius μ m | 3.99～5.13 |
| The first annular layering refractive index contrast % | -0.30～-0.91 |
| The first annular layering width μ m | 2.05～3.61 |
| The second annular layering refractive index contrast % | 0.33～0.67 |
| The second annular layering width μ m | 3.59～7.39 |
Being applicable to the full-wave nonzero dispersion flat single-mode optical fiber of CWDM communication system, is another kind of special case of the present invention.Its main performance feature is: in the 1625nm wavelength coverage, 0.1ps/nm-km≤D≤9.0ps/nm-km is satisfied in chromatic dispersion at 1300nm; Under the 1550nm wavelength, free area is not less than 50 μ m
2Its primary structure feature is: pure SiO
2Described fibre core central, circular layering (being equivalent to α 〉=100) and doping SiO
2The described first annular layering and the described second annular layering.Table 3 provides the main structure parameters of a kind of preferred embodiment of described optical fiber.
Table 3
| Structural parameters | Index |
| Fibre core central, circular layering refractive index contrast % | 0.43～0.68 |
| Fibre core central, circular layering radius μ m | 3.56～4.88 |
| The first annular layering refractive index contrast % | -0.14～-0.52 |
| The first annular layering width μ m | 2.31～4.44 |
| The second annular layering refractive index contrast % | 0.25～0.59 |
| The second annular layering width μ m | 3.52～8.39 |
The full-wave nonzero dispersion flat single-mode optical fiber of the positive dispersion that this patent is related is united use with the full-wave nonzero dispersion flat single-mode optical fiber of negative dispersion, and the chromatic dispersion complementation can significantly reduce communication system dispersion compensation cost.
The refractive index profile of described fibre core 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.
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 fibre core 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.
Institute's column data is corresponding to following condition in the table: the layering of described fibre core central, circular 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.
Full-wave nonzero dispersion flat single-mode optical fiber involved in the present invention, based on series of theories and the Optimization Design that the inventor was proposed, positive dispersion single mode operation wavelength coverage is wide, dispersion characteristics are smooth, chromatic dispersion maximal value and minimum value gap are little, surmount various existing fibers up to now, approached the theoretical limit of silica fibre under the existence conditions.
The front provides the description to preferred embodiment, makes 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. full-wave nonzero dispersion flat single-mode optical fiber, this optical fiber by the circular central segment of fibre core, be coated on the first annular layering on the circular central segment of described fibre core, be coated on the second annular layering in the described first annular layering and the even surrounding layer that is coated in the described second annular layering is formed.The circular central segment of described fibre core is a Δ with respect to the refractive index contrast of even surrounding layer
0, radius is a; The described first annular layering is a Δ with respect to the refractive index contrast of even surrounding layer
1, width is H
1The described second annular layering is a Δ with respect to the refractive index contrast of even surrounding layer
2, width is H
2The refractive index profile of the circular central segment of described fibre core is the α section basically, the refractive index of the described first annular layering and the described second annular layering is uniform basically, the refractive index of the described first annular layering is lower than the refractive index of described even surrounding layer, it is characterized in that:
The circular central segment of described fibre core, the described first annular layering, the described second annular layering and refractive index profile shape, refractive index contrast and the radius of described even surrounding layer or the selection of width can guarantee: in wavelength coverage 1300～1625nm, chromatic dispersion is between 0.1ps/nm-km and 12.0ps/nm-km; Under wavelength 1550nm, free area A
Eff〉=50 μ m
2
2. optical fiber according to claim 1 is characterized in that: the circular central segment α of described fibre core refractive index profile is got α 〉=5, Δ
0=0.39～0.74%, a=3.26～5.60 μ m.
3. optical fiber according to claim 1 is characterized in that: the described fibre core first annular layering H
1=1.72～5.27 μ m, Δ
1=-0.12～-1.08%; The described fibre core second annular layering H
2=2.96～10.00 μ m, Δ
2=0.28～0.80%.
4. optical fiber according to claim 1 is characterized in that: in wavelength coverage 1300～1625nm, chromatic dispersion is between 2.0ps/nm-km and 11.0ps/nm-km.
5. optical fiber according to claim 4 is characterized in that: under the wavelength 1550nm, and free area A
Eff〉=55 μ m
2
6. optical fiber according to claim 5 is characterized in that: the homogeneous refractive index section that the circular central segment of described fibre core is made up of pure quartz, Δ
0=0.49～0.68%, a=3.99～5.13 μ m.
7. optical fiber according to claim 5 is characterized in that: the described fibre core first annular layering H
1=2.05～3.61 μ m, Δ
1=-0.30～-0.91%; The described fibre core second annular layering H
2=3.59～7.39 μ m, Δ
2=0.33～0.67%.
8. optical fiber according to claim 1 is characterized in that: in wavelength coverage 1300～1625nm, chromatic dispersion is between 0.1ps/nm-km and 9.0ps/nm-km.
9. optical fiber according to claim 8 is characterized in that: the homogeneous refractive index section that the circular central segment of described fibre core is made up of pure quartz, Δ
0=0.43～0.68%, a=3.56～4.88 μ m.
10. optical fiber according to claim 8 is characterized in that: the described fibre core first annular layering H
1=2.31～4.44 μ m, Δ
1=-0.14～-0.52%; The described fibre core second annular layering H
2=3.52～8.39 μ m, Δ
2=0.25～0.59%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101174237A CN101169497A (en) | 2006-10-23 | 2006-10-23 | Full-wave nonzero dispersion flat single-mode optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101174237A CN101169497A (en) | 2006-10-23 | 2006-10-23 | Full-wave nonzero dispersion flat single-mode optical fiber |
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| Publication Number | Publication Date |
|---|---|
| CN101169497A true CN101169497A (en) | 2008-04-30 |
Family
ID=39390177
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101174237A Pending CN101169497A (en) | 2006-10-23 | 2006-10-23 | Full-wave nonzero dispersion flat single-mode optical fiber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102124385A (en) * | 2008-08-13 | 2011-07-13 | 康宁股份有限公司 | Multimode fiber with at least dual cladding |
| CN104136951A (en) * | 2012-02-28 | 2014-11-05 | 住友电气工业株式会社 | Optical fiber and optical communication system containing same |
| CN112987169A (en) * | 2019-12-02 | 2021-06-18 | 中国移动通信有限公司研究院 | Optical fiber |
| US11435519B2 (en) | 2019-10-29 | 2022-09-06 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Low-dispersion single-mode optical fiber |
-
2006
- 2006-10-23 CN CNA2006101174237A patent/CN101169497A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102124385A (en) * | 2008-08-13 | 2011-07-13 | 康宁股份有限公司 | Multimode fiber with at least dual cladding |
| CN102124385B (en) * | 2008-08-13 | 2013-03-20 | 康宁股份有限公司 | Multimode fiber with at least dual cladding |
| CN104136951A (en) * | 2012-02-28 | 2014-11-05 | 住友电气工业株式会社 | Optical fiber and optical communication system containing same |
| CN104136951B (en) * | 2012-02-28 | 2017-05-10 | 住友电气工业株式会社 | Optical fiber and optical communication system containing same |
| US11435519B2 (en) | 2019-10-29 | 2022-09-06 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Low-dispersion single-mode optical fiber |
| CN112987169A (en) * | 2019-12-02 | 2021-06-18 | 中国移动通信有限公司研究院 | Optical fiber |
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Open date: 20080430 |