CN105137536A - Single-mode fiber - Google Patents
Single-mode fiber Download PDFInfo
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- CN105137536A CN105137536A CN201510599416.4A CN201510599416A CN105137536A CN 105137536 A CN105137536 A CN 105137536A CN 201510599416 A CN201510599416 A CN 201510599416A CN 105137536 A CN105137536 A CN 105137536A
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- mode fiber
- fiber
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- quartz glass
- layering
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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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
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Abstract
A single-mode fiber disclosed by the present invention comprises a core layer and a cladding. The core layer is a silicon dioxide quartz glass doped with germanium and fluorine, the diameter Dcore of the core layer is between 6.5 micrometers and 7.5 micrometers, and the range of a relative refractive index delta 1 of the core layer is between 0.70% and 0.75%. The cladding comprises two layers, the inner layer is the silicon dioxide quartz glass doped with germanium, the outer layer is a pure silicon dioxide quartz glass, and the range of the diameter Dclad of the cladding is between 124 micrometers and 126 micrometers. The cut-off wavelength of the fiber of the present invention is between 1300 nanometers and 1460 nanometers, a working wavelength range is 1550 nanometers, the MFD is between 7.0 micrometers and 7.6 micrometers, and the fiber attenuation is less than 0.26dB/km(at 1550 nanometers). The fiber of the present invention possesses a better bending resistance, and the macrobend loss of the fiber is less than 0.02dB(Phi10mm25 laps). The fiber has a good bending resistance when being wound into a device of a small size, and the macrobend loss of the fiber is less than 0.03dB(Phi15mm400 laps).
Description
Technical field
The invention belongs to technical field of optical fiber, more specifically, relate to a kind of single-mode fiber.
Background technology
Single-mode fiber has that quality is light, size is little, electromagnetism interference, transfer rate are fast, information capacity is large and the advantage such as long transmission distance.Worldwide, G.652 single-mode fiber has been laid in large quantities and has been applied among optical communication network.Along with the development of special optical fiber and fiber optic applications technology thereof, the field of optical fiber beyond general communication obtains applies more and more widely.In special optical fibre device, in order to reach application target, need a kind of optical fiber can in the environment with stable transmission performance, and common G.652 single-mode fiber cannot long-term normal work under small size particular device.
The bending resistance of optical fiber is closely-related with technology such as the material structure of optical fiber, preparation technologies.Common bend insensitive fiber is generally in order to match with common single-mode fiber, and it is consistent with ordinary optic fibre to try one's best in the geometry, doping content etc. of optical fiber, thus causes Fiber Optical Parametric to match each other, to adapt to the universal performance of optical fiber.In particular application such as nautical receiving sets, optical fiber pursue small-bend radius and extremely more than the winding number of turns, and the requirement of mode field diameter etc. not to be pursued and the consistance of general single mode fiber.In order to improve the bending resistance of optical fiber, sandwich layer can adulterate the germanium (Ge) of higher concentration, in order to reduce core material and the difference of clad material in the material property such as viscosity, thermal expansivity, simultaneously also in order to regulate the optical index scope of optical fiber, the limited area of doped with fluorine is added at sandwich layer and covering, reduce the unrelieved stress in drawing process, optimized transmission performance.
In patent CN102998742B, put forward the optical fiber structure that height mixes germanium, to realize bend-insensitive, but the germanium of fiber core layer doping causes fibre loss very high, in 1550nm wavelength place attenuation up to 0.3dB/km too much.
In patent CN101373238B, mix germanium with height and three layers of cladding structure realize bend-insensitive, but its optical fiber is in order to adapt to 1310nm wavelength, causes its crooking ability still can not adapt to the requirement on devices of minor diameter, multi-turn number.
General, adulterant can change the relative index of refraction of quartz glass.The adulterants such as germanium (Ge), chlorine (Cl), phosphorus (P) can make adulterate after quartz glass relative index of refraction on the occasion of, we are referred to as " positive adulterant ", and the adulterant such as fluorine (F), boron (B) can make the relative index of refraction of the quartz glass after adulterating be negative value, we are referred to as " negative adulterant ".If use one " positive adulterant " and one " negative adulterant " to adulterate to quartz glass simultaneously, then the relative index of refraction of the quartz glass after doping can be on the occasion of or negative value, or be 0.
Summary of the invention
Introduce content of the present invention for convenience, define following term:
Refractive index profile: the relation in optical fiber between glass refraction and its radius.
Refractive index contrast:
The contribution amount of fluorine (F): mix the relative index of refraction (Δ F) of fluorine (F) quartz glass relative to pure silicon dioxide quartz glass, represents with this and mixes fluorine (F) amount.
Technical matters to be solved by this invention is to provide a kind of in the work of 1550nm wavelength, has the single-mode fiber of fabulous bending resistance.This optical fiber has lower fibre loss, good bending resistance.
The technical scheme that the problem that the present invention is the above-mentioned proposition of solution adopts is:
A kind of single-mode fiber, include sandwich layer and covering, sandwich layer is for mixing the silicon dioxide (SiO of germanium (Ge) and fluorine (F)
2) quartz glass, the diameter Dcore of sandwich layer is 6.5 μm to 7.5 μm, and the scope of the relative index of refraction Δ 1 of sandwich layer is 0.70% to 0.75%; Covering has 2 layerings, is inside layered as and mixes the layering of fluorodioxy SiClx quartz glass, be layered as pure silicon dioxide quartz glass outward; The diameter Dclad of described covering is 124 μm to 126 μm.
In one embodiment of the present of invention, the cutoff wavelength of this single-mode fiber is 1300nm to 1460nm.
In one embodiment of the present of invention, the relative index of refraction Δ 21 of interior layering with the pass of the relative index of refraction Δ 1 of sandwich layer is: 0.80%≤Δ 1-Δ 31≤0.85%, wherein the scope of Δ 21 is-0.12% to-0.09%, and the diameter D21 of interior layering is 24 μm to 30 μm.
In one embodiment of the present of invention, outer layering is closely around interior layering, and its relative index of refraction Δ 22 is 0%, and the diameter D22 of outer layering is 124 μm to 126 μm.
In one embodiment of the present of invention, by such scheme, the mode field diameter (ModeFieldDiameter, MFD) of invention optical fiber is 7.0 μm-7.6 μm when 1550nm wavelength.
In one embodiment of the present of invention, the decay of invention optical fiber is less than 0.26dB/km when 1550nm wavelength.
In one embodiment of the present of invention, the macrobending loss of invention optical fiber is less than 0.02dB/ (Φ 10mm25 encloses) when 1550nm wavelength.
In one embodiment of the present of invention, the macrobending loss of invention optical fiber is less than 0.03dB/ (Φ 15mm400 encloses) when 1550nm wavelength.
In one embodiment of the present of invention, the one realizing above-mentioned sandwich layer and cladding index preferably mode is be mixed with the germanium that percentage by weight is 5% to 8% in the core, is mixed with the fluorine that percentage by weight is 0.7% to 1.2% mixing in fluorine in layering.
In addition, also can mix one or more elements such as aluminium, phosphorus, chlorine in described sandwich layer and/or covering, also can realize same relative index of refraction structure.
Beneficial effect of the present invention is: 1. sandwich layer mixes Ge, by optimizing and revising fiber core layer material structure, can improve the numerical aperture of optical fiber, improve the restriction ability to light.Simultaneously fiber core layer mixes F, can reduce the viscosity of core material, more mate with the viscosity of clad material, can improve material structure and the stress distribution of optical fiber, is conducive to the minimizing of defect and the reduction of optical fiber attenuation after drawing optical fibers; 2., in the layering of fibre cladding, the layering containing a pure silicon dioxide silica glass material, this layering can change the material structure of optical fiber integrally, and the stress distribution after drawing optical fibers is optimized.This layering will bear the tension stress formed in drawing process, and the stress that sandwich layer bears is then compressive stress, and this stress distribution reduces the defect density in core material by being conducive to, and reduces the scattering loss of core material, is conducive to the reduction of optical fiber attenuation; 3. in the layering of fibre cladding, mix the layering of F silica quartz glass material containing 1, the layering of depressed-index wherein, have positive effect for the bending resistance improving optical fiber.The design of this hierarchy, reduces the macrobend added losses of optical fiber under small-bend radius state by being conducive to.
Accompanying drawing explanation
Fig. 1 is the radial section schematic diagram of one embodiment of the invention; The sandwich layer of 00 corresponding optical fiber in figure, the interior layering of 21 corresponding fibre claddings, the outer layering of 22 corresponding fibre claddings;
The schematic diagram of each layer diameter and corresponding relative index of refraction thereof in Fig. 2 one embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, the single-mode fiber in the embodiment of the present invention, includes sandwich layer and covering, and sandwich layer 00 is by the silicon dioxide (SiO mixing germanium (Ge) and fluorine (F)
2) quartz glass composition; Be centered around outside sandwich layer be covering.Covering has two layerings, and interior layering 21 is closely around sandwich layer, and be made up of the quartz glass mixing fluorine (F), diameter D21 is 24 μm ~ 30 μm; Outer layering 22 is closely around interior layering 21, and diameter D22 is 124 μm ~ 126 μm, is layered as pure silicon dioxide quartz glass layer outward, and namely its relative index of refraction Δ 22 is 0%.In the embodiment of the present invention, the interior layering of sandwich layer, covering and the diameter of outer layering, and the relative index of refraction of each layering is as shown in Figure 2.
According to the technical scheme of above-mentioned single-mode fiber, design in the parameter of the scope interior focusing fibre of its defined, and the plug manufacturing process such as PCVD technique, MCVD technique, OVD technique or the VAD technique known by us to manufacture plug according to the designing requirement of optical fiber, the manufacture of whole prefabricated rods is completed by over cladding process such as sleeve pipe technique, POD technique (plasm outward spraying technique, plasmaoutsidedeposition), OVD technique or VAD techniques.PCVD technique and POD technique carry out high concentration mix fluorine (F) time, there is certain advantage.
Draw the refractive index profile of optical fiber to use PK2400 testing equipment.The major parameter of the refractive index profile of optical fiber is as shown in table 1.
Table 1: the structural parameters of optical fiber
Draw the Specifeca tion speeification of optical fiber as shown in table 2, wherein MFD, decay, macrobending loss are the parameter of 1550nm wavelength.
Table 2: the main performance of optical fiber
As can be seen from embodiment: 1. sandwich layer is mixed Ge concentration and can be had an impact to the bending resistance of optical fiber and decay, suitably improve the concentration that sandwich layer mixes Ge, the bending resistance of optical fiber can be improved.But the Ge doping of excessive concentrations, can cause the increase of sandwich layer material scattering loss, also have a certain impact to manufacturing cost and technology difficulty meanwhile; 2. mix the layering of F silica quartz glass in covering, its width will change material structure and the stress distribution of optical fiber, can have an impact to the waveguide performance of optical fiber meanwhile.The raising of F layering to the bending resistance of optical fiber of mixing of depressed-index has positive effect.The increase of its width or the degree of depth all will further improve the bending property of optical fiber, but the increase of width and the degree of depth also means the increase of cost and technology difficulty.Meeting under certain bending precondition required, need to find suitable width and the structural parameters of the degree of depth.
Experiment shows, according to the optical fiber manufactured by technical scheme of the present invention, cutoff wavelength is at 1300nm-1460nm, in 1550nm operation wavelength, its MFD is 6.5 μm-7.5 μm, optical fiber attenuation is less than 0.26dB/km, and macrobending loss is less than 0.02dB/ (Φ 10mm25 encloses), and macrobending loss is less than 0.03dB/ (Φ 15mm400 encloses).
Single-mode fiber of the present invention has good bending resistance, can use in nautical receiving set.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a single-mode fiber, includes sandwich layer and covering, it is characterized in that, sandwich layer is for mixing the silicon dioxide (SiO of germanium (Ge) and fluorine (F)
2) quartz glass, the diameter Dcore of sandwich layer is 6.5 μm to 7.5 μm, and the scope of the relative index of refraction Δ 1 of sandwich layer is 0.70% to 0.75%; Covering has 2 layerings, is inside layered as and mixes fluorodioxy SiClx quartz glass, be layered as pure silicon dioxide quartz glass outward; The scope of the diameter Dclad of described covering is for being 124 μm to 126 μm.
2. single-mode fiber as claimed in claim 1, it is characterized in that, described interior layering is closely around sandwich layer, the relative index of refraction Δ 21 of interior layering with the pass of the relative index of refraction Δ 1 of sandwich layer is: 0.80%≤Δ 1-Δ 21≤0.85%, wherein the scope of Δ 21 is-0.12% to-0.09%, and the diameter D21 of described interior layering is 24 μm to 25 μm.
3. single-mode fiber as claimed in claim 1 or 2, it is characterized in that, described outer layering is closely around interior layering, and its relative index of refraction Δ 22 is 0%, and the diameter D22 of outer layering is 124 μm to 126 μm.
4. single-mode fiber as claimed in claim 1 or 2, it is characterized in that, the cutoff wavelength of this single-mode fiber is 1300nm to 1460nm.
5. single-mode fiber as claimed in claim 1 or 2, it is characterized in that, the MFD of described single-mode fiber is 7.0 μm-7.6 μm when 1550nm wavelength.
6. single-mode fiber as claimed in claim 1 or 2, it is characterized in that, the decay of described single-mode fiber is less than 0.26dB/km when 1550nm wavelength.
7. single-mode fiber as claimed in claim 1 or 2, it is characterized in that, the macrobending loss of described single-mode fiber is less than 0.02dB (Φ 10mm25 encloses) when 1550nm wavelength.
8. single-mode fiber as claimed in claim 1 or 2, it is characterized in that, the macrobending loss of described single-mode fiber is less than 0.03dB (Φ 15mm400 encloses) when 1550nm wavelength.
9. single-mode fiber as claimed in claim 1 or 2, is characterized in that, be mixed with the germanium that percentage by weight is 5% to 8% in the core, be mixed with the fluorine that percentage by weight is 0.7% to 1.2% in the inner cladding mixing fluorine.
10. single-mode fiber as claimed in claim 1 or 2, is characterized in that, mix aluminium, phosphorus, chlorine one or more elements wherein in described sandwich layer and/or covering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510599416.4A CN105137536B (en) | 2015-09-18 | 2015-09-18 | A kind of single mode optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510599416.4A CN105137536B (en) | 2015-09-18 | 2015-09-18 | A kind of single mode optical fiber |
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| CN105137536A true CN105137536A (en) | 2015-12-09 |
| CN105137536B CN105137536B (en) | 2018-07-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154410A (en) * | 2016-08-30 | 2016-11-23 | 烽火通信科技股份有限公司 | A kind of single-mode fiber and manufacture method thereof |
| CN106249347A (en) * | 2016-08-19 | 2016-12-21 | 武汉理工大学 | For preparing bend-insensitive light-sensitive optical fibre and the preparation method of low light level grid array online |
| CN106324749A (en) * | 2016-10-20 | 2017-01-11 | 长飞光纤光缆股份有限公司 | Few-mode optical fiber used for amplifier |
| CN112596148A (en) * | 2020-11-24 | 2021-04-02 | 法尔胜泓昇集团有限公司 | Ytterbium-doped active optical fiber for high-power large-mode field and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6178279B1 (en) * | 1997-03-25 | 2001-01-23 | The Furukawa Electric Co. Ltd. | Dispersion compensating optical fiber, and wavelength division multiplex light transmission line using the same |
| US20050244121A1 (en) * | 2003-01-27 | 2005-11-03 | Peter Dragic | Waveguide configuration |
| US20080292257A1 (en) * | 2002-02-13 | 2008-11-27 | The Furukawa Electric Co., Ltd. | Optical fiber and optical transmission line and optical communication system including such optical fiber |
| CN100545684C (en) * | 2005-03-01 | 2009-09-30 | 古河电气工业株式会社 | Optical fiber and optical interconnection system |
| CN102998742A (en) * | 2012-12-13 | 2013-03-27 | 长飞光纤光缆有限公司 | Anti-bending single mode fiber with small mode field |
-
2015
- 2015-09-18 CN CN201510599416.4A patent/CN105137536B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6178279B1 (en) * | 1997-03-25 | 2001-01-23 | The Furukawa Electric Co. Ltd. | Dispersion compensating optical fiber, and wavelength division multiplex light transmission line using the same |
| US20080292257A1 (en) * | 2002-02-13 | 2008-11-27 | The Furukawa Electric Co., Ltd. | Optical fiber and optical transmission line and optical communication system including such optical fiber |
| US20050244121A1 (en) * | 2003-01-27 | 2005-11-03 | Peter Dragic | Waveguide configuration |
| CN100545684C (en) * | 2005-03-01 | 2009-09-30 | 古河电气工业株式会社 | Optical fiber and optical interconnection system |
| CN102998742A (en) * | 2012-12-13 | 2013-03-27 | 长飞光纤光缆有限公司 | Anti-bending single mode fiber with small mode field |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249347A (en) * | 2016-08-19 | 2016-12-21 | 武汉理工大学 | For preparing bend-insensitive light-sensitive optical fibre and the preparation method of low light level grid array online |
| CN106154410A (en) * | 2016-08-30 | 2016-11-23 | 烽火通信科技股份有限公司 | A kind of single-mode fiber and manufacture method thereof |
| CN106324749A (en) * | 2016-10-20 | 2017-01-11 | 长飞光纤光缆股份有限公司 | Few-mode optical fiber used for amplifier |
| CN106324749B (en) * | 2016-10-20 | 2020-01-14 | 长飞光纤光缆股份有限公司 | Few-mode optical fiber for amplifier |
| CN112596148A (en) * | 2020-11-24 | 2021-04-02 | 法尔胜泓昇集团有限公司 | Ytterbium-doped active optical fiber for high-power large-mode field and preparation method thereof |
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| CN105137536B (en) | 2018-07-03 |
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