CN104678490A - Highly germanium-doped quartz optical fiber with broadband flattened normal dispersion characteristic - Google Patents
Highly germanium-doped quartz optical fiber with broadband flattened normal dispersion characteristic Download PDFInfo
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- CN104678490A CN104678490A CN201510121483.5A CN201510121483A CN104678490A CN 104678490 A CN104678490 A CN 104678490A CN 201510121483 A CN201510121483 A CN 201510121483A CN 104678490 A CN104678490 A CN 104678490A
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- optical fiber
- germanium
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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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
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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
- G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention provides a highly germanium-doped quartz optical fiber with the broadband flattened normal dispersion characteristic. The highly germanium-doped quartz optical fiber comprises a fiber core and an optical fiber coating set sleeving the fiber core. The optical fiber coating set comprises a first ring-shaped optical fiber coating, a second ring-shaped optical fiber coating and an outer optical fiber coating; the first ring-shaped optical fiber coating and the second ring-shaped optical fiber coating are sequentially arranged between the fiber core and the outer optical fiber coating from inside to outside, wherein the relation among refractive indexes (n1, n2, n3 and n4) of the fiber core, the first ring-shaped optical fiber coating, the second ring-shaped optical fiber coating and the outer optical fiber coating meets the conditions that n1 is larger than n3, n3 is larger than n4 and n4 is larger than or equal to n2, and molar concentration of germanium dioxide of the optical fiber coating set is larger than 20mol percent. According to the quartz optical fiber provided by the invention, the optical fiber structure is simplified; meanwhile, a nonlinear coefficient of the optical fiber is improved; mode loss is reduced; by utilizing the optical fiber, a supercontinuum with a high coherence property and a wavelength bandwidth of 0.8 to 3.2 <mu>m can be obtained.
Description
Technical field
The present invention relates to a kind of high germanium-doped silica fiber, be specifically related to a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic.
Background technology
The flat-top super continuum light spectrum with high coherence has important using value in fields such as coherence tomography detection, non-linear microoptic and ultrafast pulse compressions.The highly nonlinear optical fiber wherein with broadband smooth normal dispersion characteristic builds the vitals producing high coherence's flat-top super continuum light spectrum optical fiber source.The optical fiber at present with smooth dispersion characteristics mainly contains following two kinds of versions:
A kind of is obtain smooth normal dispersion characteristic based on air and quartzy photonic crystal fiber, this kind of structure is that the airport diameter and span by optimizing photonic crystal fiber can obtain smooth normal dispersion characteristic, in photonic crystal fiber core district, introduce the less airport of one deck diameter on this basis, and be filled with and there is suitable testing low-refractivity liquid to obtain smooth dispersion characteristics.
Another kind obtains smooth normal dispersion characteristic based on the total solids photonic crystal fiber of silicate glass material, this kind of structure utilizes two kinds of silicate glasses (as glass model F2 and NC21) with different refractivity to form photonic crystal fiber, can obtain full normal flat dispersion characteristics by optimizing optical fiber parameter.
But, above-mentioned two kinds of structures all need based on photonic crystals optical fiber structure, wherein in drawing optical fiber process, solution is inevitably needed to prevent minor diameter airport to cave in problem and dimension control problem based on the optical fiber of air cladding layer, this proposes very high requirement to technique, and cost obviously increases; Airport is replaced to avoid by the fibre cladding that periodic arrangement is formed the problem that above-mentioned airport easily caves in based on low-refraction silicate material pole, but because spillage of material causes fibre loss comparatively large, the fibre loss coefficient therefore near infrared wavelength region is up to 2-3dB/m.
Summary of the invention
In view of this, the invention provides a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic, be intended to simplify the optical fiber structure with the smooth normal dispersion characteristic in broadband, reduce its fibre loss.
The technical solution used in the present invention is specially:
A kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic, comprise fibre core and be placed on the fibre cladding group outside described fibre core, described fibre cladding group comprises the first annular fibre cladding, the second optical fibre ring covering and infrared optical fiber covering, and described first annular fibre cladding and described second optical fibre ring covering are located between described fibre core and described infrared optical fiber covering from inside to outside successively; Wherein: the refractive index n of the second optical fibre ring covering, described infrared optical fiber covering described in described fibre core, described first annular fibre cladding
1, n
2, n
3, n
4between meet n
1>n
3>n
4>=n
2; The material of described fibre cladding group is the quartz material of germanium dioxide volumetric molar concentration > 20mol%.
In above-mentioned high germanium-doped silica fiber, described fibre core is that height mixes germanium fibre core.
In above-mentioned high germanium-doped silica fiber, described height mixes the quartz material that germanium fibre core is germanium dioxide volumetric molar concentration > 20mol%.
In above-mentioned high germanium-doped silica fiber, described germanium dioxide volumetric molar concentration be (60mol%, 100mol%].
In above-mentioned high germanium-doped silica fiber, described fibre core is non-linear liquid core.
In above-mentioned high germanium-doped silica fiber, described non-linear liquid core is carbon disulphide and/or phenixin liquid core.
In above-mentioned high germanium-doped silica fiber, the radius of described fibre core is (1.5 μm, 2 μm).
In above-mentioned high germanium-doped silica fiber, the radius of described first annular fibre cladding is (3 μm, 4 μm), the described first annular fibre cladding quartz material that to be germanium dioxide volumetric molar concentration be (20mol%, 60mol%).
In above-mentioned high germanium-doped silica fiber, the radius of described second optical fibre ring covering is (4.1 μm, 5 μm), the described second optical fibre ring covering quartz material that to be germanium dioxide volumetric molar concentration be (40mol%, 80mol%).
In above-mentioned high germanium-doped silica fiber, the described infrared optical fiber covering quartz material that to be germanium dioxide volumetric molar concentration be (20mol%, 60mol%).
The beneficial effect that the present invention produces is:
The refractive index that high germanium-doped silica fiber of the present invention makes optical fiber from center core area to covering by the high germanium dioxide volumetric molar concentration of mixing in germanium quartz material of change distributes in height, wherein the core district of fiber optic hub is that refractive index highest portion is divided, the liquid that the height that material can be greater than 60mol% for pure germanium dioxide, germanium dioxide volumetric molar concentration is mixed germanite English or had compared with high non-linearity refractive index.It is more simple that the optical fiber that the present invention relates to structurally compares to photonic crystal fiber, and the difficulty of drawing optical fiber is minimized, and near infrared wavelength region, fibre loss of the present invention is lower than 0.001dB/m; Meanwhile, within the scope of 0.8-3.2 mum wavelength, under the prerequisite that can obtain smooth normal group velocity dispersion curve, its chromatic dispersion gradient is lower than 0.09ps/nm
2/ km.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, more completely the present invention can be understood better.Accompanying drawing described herein is used to provide a further understanding of the present invention, and embodiment and explanation thereof, for explaining the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is a kind of structural representation with the high germanium-doped silica fiber of broadband smooth normal dispersion characteristic of the present invention.
In figure: 1, annular fibre cladding 3, the second optical fibre ring covering 4 of fibre core 2, first, infrared optical fiber covering.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
A kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic as shown in Figure 1, the fibre cladding group that the height comprised from inside to outside is mixed germanium fibre core 1 and is made up of the first annular fibre cladding 2, second optical fibre ring covering 3 and infrared optical fiber covering 4, height mixes the optical fibre ring covering (2,3) introduced between germanium fibre core 1 and high germnium doped fiber covering 4 and have different germanium dioxide doping volumetric molar concentration, if the refractive index of fibre core 1 and fibre cladding (2,3,4) is expressed as n successively
1, n
2, n
3and n
4, then, in high germanium-doped silica fiber of the present invention, n need be met
1>n
3>n
4>=n
2; And in fibre core 1 and each covering, mix the quartz material that germanium dioxide volumetric molar concentration is all greater than 20mol%.
Preferred as one, fibre core 1, fibre cladding (2,3,4) are germanium dioxide volumetric molar concentration (x during quartz material
1, x
2, x
3, x
4) and fibre core 1, fibre cladding (2,3) radius (r
1, r
2, r
3) be respectively:
Height mixes germanium fibre core 1:60mol%<x
1≤ 100mol% (when concentration is 100mol% and pure germanium dioxide), 1.5 μm of <r
1<2 μm;
First annular fibre cladding 2:20mol%<x
2<60mol%, 3 μm of <r
2<4 μm;
Second optical fibre ring covering 3:40mol%<x
3<80mol%, 4.1 μm of <r
3<5 μm;
Fibre cladding 4:20mol%<x
4<60mol%.
In order to the super continuum light spectrum obtaining part middle-infrared band exports, above-mentioned height can be replaced to mix germanium fibre core 1 by high non-linearity liquid core (as carbon disulphide and/or phenixin liquid).
Further, cross section is that circular fibre core 1 can also be designed to oval fibre core, also fibre core 1 can be further designed to twin-core structure, to obtain high birefringence rate characteristic.
Three layers of above-mentioned covering are the most basic structure belonging to silica fibre; what be greater than three layers more multi-layeredly can realize normal dispersion equally; therefore anyly comprise of the present invention further expanding and also should belong to protection scope of the present invention; layer covering but increases optical fiber structure complexity but more; therefore from the angle optimizing optical fiber structure, the optical fiber of three layers of cladding structure of the present invention is optimal selection.
Below explain embodiments of the invention by reference to the accompanying drawings, accompanying drawing is herein used to provide a further understanding of the present invention.Obviously; the foregoing is only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; any be to one skilled in the art can expect easily, do not depart from change of the present invention or replacement in fact, be also all included within protection scope of the present invention.
Claims (10)
1. one kind has the high germanium-doped silica fiber of broadband smooth normal dispersion characteristic, it is characterized in that, comprise fibre core and be placed on the fibre cladding group outside described fibre core, described fibre cladding group comprises the first annular fibre cladding, the second optical fibre ring covering and infrared optical fiber covering, and described first annular fibre cladding and described second optical fibre ring covering are located between described fibre core and described infrared optical fiber covering from inside to outside successively; Wherein:
The refractive index n of described fibre core, described first annular fibre cladding, described second optical fibre ring covering, described infrared optical fiber covering
1, n
2, n
3, n
4between meet n
1>n
3>n
4>=n
2; The material of described fibre cladding group is the quartz material of germanium dioxide volumetric molar concentration > 20mol%.
2. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 1, is characterized in that, described fibre core is that height mixes germanium fibre core.
3. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 2, it is characterized in that, described height mixes the quartz material that germanium fibre core is germanium dioxide volumetric molar concentration > 20mol%.
4. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 3, is characterized in that, described germanium dioxide volumetric molar concentration be (60mol%, 100mol%].
5. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 1, it is characterized in that, described fibre core is non-linear liquid core.
6. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 5, is characterized in that, described non-linear liquid core is carbon disulphide and/or phenixin liquid core.
7. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 1, is characterized in that, the radius of described fibre core is (1.5 μm, 2 μm).
8. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 1, it is characterized in that, the radius of described first annular fibre cladding is (3 μm, 4 μm), the described first annular fibre cladding quartz material that to be germanium dioxide volumetric molar concentration be (20mol%, 60mol%).
9. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 1, it is characterized in that, the radius of described second optical fibre ring covering is (4.1 μm, 5 μm), the described second optical fibre ring covering quartz material that to be germanium dioxide volumetric molar concentration be (40mol%, 80mol%).
10. a kind of high germanium-doped silica fiber with broadband smooth normal dispersion characteristic according to claim 1, is characterized in that, the described infrared optical fiber covering quartz material that to be germanium dioxide volumetric molar concentration be (20mol%, 60mol%).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510121483.5A CN104678490B (en) | 2015-03-19 | 2015-03-19 | A kind of high germanium-doped silica fiber with the flat normal dispersion characteristic in broadband |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510121483.5A CN104678490B (en) | 2015-03-19 | 2015-03-19 | A kind of high germanium-doped silica fiber with the flat normal dispersion characteristic in broadband |
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|---|---|
| CN104678490A true CN104678490A (en) | 2015-06-03 |
| CN104678490B CN104678490B (en) | 2017-12-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107450124A (en) * | 2016-05-30 | 2017-12-08 | 天津大学 | A kind of Wideband dispersion control optical fibre and its Dispersion managed method |
| CN109031516A (en) * | 2018-07-11 | 2018-12-18 | 烽火通信科技股份有限公司 | A kind of large mode field Double Cladding Ytterbium Doped Fiber |
Citations (6)
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| JPS61209925A (en) * | 1985-03-13 | 1986-09-18 | Hitachi Cable Ltd | Infrared ray fiber |
| CN1497274A (en) * | 2002-10-01 | 2004-05-19 | �źӵ�����ҵ��ʽ���� | Optical fibre, optical transmission line and maufacturing method of optical fibre |
| CN1657989A (en) * | 2003-06-18 | 2005-08-24 | 株式会社藤仓 | Higher order mode dispersion compensating fiber and mode converter for higher order fiber |
| US20070266738A1 (en) * | 2006-05-19 | 2007-11-22 | Michael Thomas Gallagher | Method of making an optical fiber |
| CN101236273A (en) * | 2008-02-29 | 2008-08-06 | 上海大学 | Single mode and multi-mode cladding mode interference special type optical fibre and method for making same |
| CN103454719A (en) * | 2013-09-03 | 2013-12-18 | 长飞光纤光缆有限公司 | Single mode optical fiber |
-
2015
- 2015-03-19 CN CN201510121483.5A patent/CN104678490B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61209925A (en) * | 1985-03-13 | 1986-09-18 | Hitachi Cable Ltd | Infrared ray fiber |
| CN1497274A (en) * | 2002-10-01 | 2004-05-19 | �źӵ�����ҵ��ʽ���� | Optical fibre, optical transmission line and maufacturing method of optical fibre |
| CN1657989A (en) * | 2003-06-18 | 2005-08-24 | 株式会社藤仓 | Higher order mode dispersion compensating fiber and mode converter for higher order fiber |
| US20070266738A1 (en) * | 2006-05-19 | 2007-11-22 | Michael Thomas Gallagher | Method of making an optical fiber |
| CN101236273A (en) * | 2008-02-29 | 2008-08-06 | 上海大学 | Single mode and multi-mode cladding mode interference special type optical fibre and method for making same |
| CN103454719A (en) * | 2013-09-03 | 2013-12-18 | 长飞光纤光缆有限公司 | Single mode optical fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107450124A (en) * | 2016-05-30 | 2017-12-08 | 天津大学 | A kind of Wideband dispersion control optical fibre and its Dispersion managed method |
| CN109031516A (en) * | 2018-07-11 | 2018-12-18 | 烽火通信科技股份有限公司 | A kind of large mode field Double Cladding Ytterbium Doped Fiber |
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| Publication number | Publication date |
|---|---|
| CN104678490B (en) | 2017-12-08 |
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