CN105137536B - A kind of single mode optical fiber - Google Patents
A kind of single mode optical fiber Download PDFInfo
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- CN105137536B CN105137536B CN201510599416.4A CN201510599416A CN105137536B CN 105137536 B CN105137536 B CN 105137536B CN 201510599416 A CN201510599416 A CN 201510599416A CN 105137536 B CN105137536 B CN 105137536B
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- optical fiber
- single mode
- mode optical
- sandwich layer
- 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
-
- 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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- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of single mode optical fibers, include sandwich layer and covering, and sandwich layer is the silica (SiO for mixing germanium (Ge) and fluorine (F)2) quartz glass, the diameter Dcore of sandwich layer is 6.5 μm to 7.5 μm, ranging from the 0.70% to 0.75% of the relative index of refraction Δ 1 of sandwich layer；Covering has 2 layerings, is inside layered as the layering of fluorine doped silica quartz glass, is layered as pure silicon dioxide quartz glass outside；The diameter Dclad's of the covering is ranging from 124 μm to 126 μm.The cutoff wavelength of optical fiber of the present invention is 1300nm 1460nm, and operating wavelength range 1550nm, MFD are 7.0 μm 7.6 μm, and optical fiber attenuation is less than 0.26dB/km (in 1550nm).Optical fiber of the present invention has preferable bending resistance, and macrobending loss is less than 0.02dB (Φ 10mm25 circles)；There is good bending resistance, macrobending loss is less than 0.03dB (Φ 15mm400 circles) when being coiled into small size device.
Description
Technical field
The invention belongs to technical field of optical fiber, more particularly, to a kind of single mode optical fiber.
Background technology
Single mode optical fiber is with light weight, size is small, electromagnetism interference, transmission rate is fast, information capacity is big and transmission range
The advantages that remote.Worldwide, G.652 single mode optical fiber has been laid with and in large quantities applied among optical communication network.With
The continuous development of special optical fiber and its fiber optic applications technology, field of the optical fiber other than general communication have obtained increasingly wider
General application.In special optical fibre device, purpose is used in order to reach, need it is a kind of can have in the environment it is stable
The optical fiber of transmission performance, and common G.652 single mode optical fiber can not for a long time work normally under small size particular device.
The bending resistance of optical fiber is closely related with the technologies such as the material structure of optical fiber, preparation process.Common bending resistance
Bent optical fiber generally in order to match with common single mode optical fiber, and geometry, doping concentration in optical fiber etc. as possible with
Ordinary optic fibre is consistent, matches each other so as to cause Fiber Optical Parametric, to adapt to the universal performance of optical fiber.It is special in hydrophone etc.
Application scenario, optical fiber pursue small-bend radius and extremely more winding number of turns, and the requirement to mode field diameter etc. do not pursue with it is general
The consistency of logical single mode optical fiber.In order to improve the bending resistance of optical fiber, sandwich layer can adulterate the germanium (Ge) of higher concentration, in order to subtract
Few core material and difference of the clad material in terms of the material properties such as viscosity, coefficient of thermal expansion, and also to adjust optical fiber
Optical index range, sandwich layer and covering increase doping fluorine finite region, reduce drawing process in residual stress, it is excellent
Change transmission performance.
In patent CN102998742B, put forward the optical fiber structure of highly doped germanium, to realize bend-insensitive, however optical fiber
The germanium of sandwich layer doping causes fibre loss very high too much, and attenuation is up to 0.3dB/km at 1550nm wavelength.
In patent CN101373238B, bend-insensitives are realized with highly doped germanium and three layers of cladding structure, however its optical fiber
In order to adapt to 1310nm wavelength, its bending ability is caused still not adapt to the requirement on devices of minor diameter, multi-turn number.
Generally, dopant can change the relative index of refraction of quartz glass.The dopants such as germanium (Ge), chlorine (Cl), phosphorus (P) can
So that the relative index of refraction of the quartz glass after doping is positive value, we term it " positive dopant ", and fluorine (F), boron (B) etc.
Dopant can so that the relative index of refraction of the quartz glass after doping is negative value, and we term it " negative dopants ".It is if same
When quartz glass is doped using a kind of " positive dopant " and a kind of " negative dopant ", then the phase of the quartz glass after doping
Refractive index can be on the occasion of either negative value or be 0.
Invention content
The content of present invention is introduced for convenience, defines following term：
Refractive index profile：Relationship in optical fiber between glass refraction and its radius.
Relative fefractive index difference：
The contribution amount of fluorine (F)：Fluorine doped (F) quartz glass relative to pure silicon dioxide quartz glass relative index of refraction (Δ
F), with this come represent fluorine doped (F) measure.
The technical problems to be solved by the invention be to provide it is a kind of work in 1550nm wavelength, there is fabulous bending resistance
The single mode optical fiber of energy.The optical fiber has relatively low fibre loss, preferable bending resistance.
The present invention is solves the problems, such as that used technical solution set forth above is：
A kind of single mode optical fiber, includes sandwich layer and covering, and sandwich layer is the silica (SiO for mixing germanium (Ge) and fluorine (F)2) stone
English glass, the diameter Dcore of sandwich layer are 6.5 μm to 7.5 μm, the relative index of refraction Δ 1 of sandwich layer ranging from 0.70% to
0.75%；Covering has 2 layerings, is inside layered as the layering of fluorine doped silica quartz glass, is layered as pure silicon dioxide quartz outside
Glass；The diameter Dclad of the covering is 124 μm to 126 μm.
In one embodiment of the present of invention, the cutoff wavelength of the single mode optical fiber is 1300nm to 1460nm.
In one embodiment of the present of invention, the pass of the relative index of refraction Δ 21 of interior layering and the relative index of refraction Δ 1 of sandwich layer
It is to be：Ranging from-the 0.12% to -0.09% of 0.80%≤Δ 1- Δs 31≤0.85%, wherein Δ 21, the diameter of interior layering
D21 is 24 μm to 30 μm.
In one embodiment of the present of invention, closely around interior layering, relative index of refraction Δ 22 is 0% for outer layering, outer point
The diameter D22 of layer is 124 μm to 126 μm.
In one embodiment of the present of invention, by said program, mode field diameter (the Mode Field of invention optical fiber
Diameter, MFD) in 1550nm wavelength be 7.0 μm -7.6 μm.
In one embodiment of the present of invention, the attenuation of invention optical fiber is less than 0.26dB/km in 1550nm wavelength.
In one embodiment of the present of invention, the macrobending loss of invention optical fiber is less than 0.02dB/ (Φ in 1550nm wavelength
10mm25 is enclosed).
In one embodiment of the present of invention, the macrobending loss of invention optical fiber is less than 0.03dB/ (Φ in 1550nm wavelength
15mm400 is enclosed).
In one embodiment of the present of invention, a kind of preferable mode for realizing above-mentioned sandwich layer and cladding index is, in core
Layer in mixed with weight percent be 5% to 8% germanium, in the interior layering of fluorine doped mixed with weight percent be 0.7% to 1.2%
Fluorine.
In addition, can also mix one or more elements such as aluminium, phosphorus, chlorine in the sandwich layer and/or covering, can also realize same
The relative index of refraction structure of sample.
The beneficial effects of the present invention are：It, can be with by being optimized and revised to fiber core layer material structure 1. sandwich layer mixes Ge
The numerical aperture of optical fiber is improved, improves the restriction ability to light.Fiber core layer mixes F simultaneously, can reduce the viscosity of core material,
It is more matched with the viscosity of clad material, the material structure and stress distribution of optical fiber can be improved, lacked after being conducive to drawing optical fibers
Sunken reduction and the reduction of optical fiber attenuation；2. in the layering of fibre cladding, containing there are one pure silicon dioxide silica glass materials
The material structure of optical fiber entirety can be changed in layering, the layering so that the stress distribution after drawing optical fibers is optimized.The layering will
The tensile stress formed in drawing process is undertaken, the stress that sandwich layer is born is then compression, which is beneficial to reduce
The defects of core material concentration reduces the scattering loss of core material, is conducive to the reduction of optical fiber attenuation；3. fibre cladding
In layering, the layering of mixing F silica quartz glass materials containing 1, the layering of depressed-index therein, for improving light
Fine bending resistance plays the role of positive.The design of the layered structure is beneficial to reduce optical fiber in small-bend radius state
Under macrobend added losses.
Description of the drawings
Fig. 1 is the radial cross section of one embodiment of the invention；The sandwich layer of 00 correspondence optical fiber in figure, 21 correspond to optical fiber
The interior layering of covering, 22 correspond to the outer layering of fibre cladding；
Fig. 2 is each layer diameter and its schematic diagram of corresponding relative index of refraction in one embodiment of the invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
As shown in Figure 1, the single mode optical fiber in the embodiment of the present invention, includes sandwich layer and covering, sandwich layer 00 is by mixing germanium (Ge)
With the silica (SiO of fluorine (F)2) quartz glass composition；It is covering to be centered around outside sandwich layer.There are two coverings is layered,
Interior layering 21 closely surrounds sandwich layer, is made of the quartz glass of fluorine doped (F), and diameter D21 is 24 μm~30 μm；Outer layering 22 is close
Around interior layering 21, diameter D22 is 124 μm~126 μm, is layered as pure silicon dioxide quartz glass layer outside, i.e. its relative
Rate Δ 22 is 0%.In the embodiment of the present invention, sandwich layer, the interior layering of covering and the diameter and the phase of each layering that are layered outside
Refractive index is as shown in Figure 2.
According to the technical solution of above-mentioned single mode optical fiber, the parameter of optical fiber is designed in the range of its defined, and
By the plugs manufacturing process such as PCVD techniques, MCVD techniques, OVD techniques or VAD techniques known to us come setting according to optical fiber
Meter requirement manufacture plug, passes through casing technique, POD techniques (plasm outward spraying technique, plasma outside
Deposition), the over cladding process such as OVD techniques or VAD techniques complete the manufacture of entire prefabricated rods.PCVD techniques and POD works
Skill has certain advantage in fluorine doped (F) for carrying out high concentration.
The refractive index profile of drawn optical fiber is tested using PK2400 equipment.The major parameter of the refractive index profile of optical fiber
As shown in table 1.
Table 1：The structural parameters of optical fiber
The Specifeca tion speeification of drawn optical fiber is as shown in table 2, wherein MFD, attenuation, the ginseng that macrobending loss is 1550nm wavelength
Number.
Table 2：The main performance of optical fiber
From embodiment it can be seen that：1. sandwich layer, which mixes Ge concentration, can have an impact the bending resistance of optical fiber and attenuation, fit
The concentration of Ge is mixed when improving sandwich layer, the bending resistance of optical fiber can be improved.However, the Ge doping of excessive concentrations, can cause core
The increase of layer material scattering loss, meanwhile, it also has a certain impact to manufacture cost and technology difficulty；2. mix F dioxies in covering
SiClx quartz glass is layered, the material structure and stress distribution that width will change optical fiber, meanwhile, it can be to the waveguide performance of optical fiber
It has an impact.Depressed-index mix F layering play the role of to the raising of the bending resistance of optical fiber it is positive.Its width or depth
The bending property that the increase of degree all will further improve optical fiber, however, the increase of width and depth also implies that cost and work
The increase of skill difficulty.Under the precondition for meeting certain bending requirement, need to find the structure ginseng of suitable width and depth
Number.
Experiment shows the optical fiber manufactured by technical solution according to the invention, cutoff wavelength in 1300nm-1460nm,
1550nm operation wavelengths, MFD are 6.5 μm -7.5 μm, and optical fiber attenuation is less than 0.26dB/km, and macrobending loss is less than 0.02dB/
(Φ 10mm25 circles), macrobending loss are less than 0.03dB/ (Φ 15mm400 circles).
Single mode optical fiber of the present invention has preferable bending resistance, can be used in hydrophone.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made all within the spirits and principles of the present invention etc., should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of single mode optical fiber, includes sandwich layer and covering, which is characterized in that sandwich layer is the titanium dioxide for mixing germanium (Ge) and fluorine (F)
Silicon (SiO2) quartz glass, the diameter Dcore of sandwich layer is 6.5 μm to 7.5 μm, and the relative index of refraction Δ 1 of sandwich layer is ranging from
0.70% to 0.75%；Covering has 2 layerings, is inside layered as fluorine doped silica quartz glass, is layered as pure silicon dioxide outside
Quartz glass；The diameter Dclad's of the covering is ranging from 124 μm to 126 μm, and the interior layering is interior closely around sandwich layer
The relative index of refraction Δ 21 of layering and the relationship of the relative index of refraction Δ 1 of sandwich layer are：0.80%≤Δ 1- Δs 21≤0.85%,
Ranging from-the 0.12% to -0.09% of middle Δ 21, the diameter D21 of the interior layering is 24 μm to 25 μm, the single mode optical fiber
MFD is 7.0 μm -7.6 μm in 1550nm wavelength.
2. single mode optical fiber as described in claim 1, which is characterized in that the outer layering is opposite to roll over closely around interior layering
It is 0% to penetrate rate Δ 22, and the diameter D22 of outer layering is 124 μm to 126 μm.
3. single mode optical fiber as described in claim 1, which is characterized in that the cutoff wavelength of the single mode optical fiber for 1300nm extremely
1460nm。
4. single mode optical fiber as described in claim 1, which is characterized in that the attenuation of the single mode optical fiber is small in 1550nm wavelength
In 0.26dB/km.
5. single mode optical fiber as described in claim 1, which is characterized in that the macrobending loss of the single mode optical fiber is in 1550nm wavelength
When be less than 0.02dB, wherein macrobend for Φ 10mm25 circle.
6. single mode optical fiber as described in claim 1, which is characterized in that the macrobending loss of the single mode optical fiber is in 1550nm wavelength
When be less than 0.03dB, wherein macrobend for Φ 15mm400 circle.
7. single mode optical fiber as described in claim 1, which is characterized in that be in the core 5% to 8% mixed with weight percent
Germanium, mixed with the fluorine that weight percent is 0.7% to 1.2% in the inner cladding of fluorine doped.
8. single mode optical fiber as described in claim 1, which is characterized in that aluminium, phosphorus, chlorine are mixed in the sandwich layer and/or covering
One or more elements therein.
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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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| CN105137536B true CN105137536B (en) | 2018-07-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106249347B (en) * | 2016-08-19 | 2020-12-22 | 武汉理工大学 | Bending insensitive photosensitive fiber for on-line preparation of weak grating array and preparation method |
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CA2232101A1 (en) * | 1997-03-25 | 1998-09-25 | Kazunori Mukasa | Dispersion compensating optical fiber, and wavelength division multiplex light transmission line using the same |
| US6856744B2 (en) * | 2002-02-13 | 2005-02-15 | The Furukawa Electric Co., Ltd. | Optical fiber and optical transmission line and optical communication system including such optical fiber |
| US7209626B2 (en) * | 2003-01-27 | 2007-04-24 | Peter Dragic | Waveguide configuration |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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