CN104216045A - Optical fiber and manufacturing method thereof - Google Patents
Optical fiber and manufacturing method thereof Download PDFInfo
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- CN104216045A CN104216045A CN201410487441.9A CN201410487441A CN104216045A CN 104216045 A CN104216045 A CN 104216045A CN 201410487441 A CN201410487441 A CN 201410487441A CN 104216045 A CN104216045 A CN 104216045A
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- optical fiber
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- core layer
- fluorine
- layer
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Abstract
The invention discloses an optical fiber and a manufacturing method thereof. The optical fiber comprises a fiber core layer and a wrapping layer; the fiber core layer is covered with the wrapping layer. The wrapping layer comprises an inner wrapping layer, a sunk wrapping layer and an outer wrapping layer in order from inside to outside. The optical fiber satisfies the following relations: delta 1 which is equal to n1-n0 is greater than -0.05% and less than -0.05%, delta 2 which is equal to n2-n0 is greater than -0.4% and less than -0.2%, delta 3 which is equal to n3-n0 is greater than -0.6% and less than -0.3%, and delta 4 which is equal to n4-n0 is greater than -0.3% and less than -0.1%, wherein n0 is the refractive index of pure quartz, n1 is the refractive index of the fiber core layer, n2 is the refractive index of the inner wrapping layer, n3 is the refractive index of sunk wrapping layer and n4 is the refractive index of the outer wrapping layer.
Description
Technical field
The present invention relates to and relate to Optical Fiber Transmission field; particularly relate to a kind of production method of large effective area low loss fiber prefabricated rods; combined by PCVD+RIC; large effective area low loss fiber can not only be produced; adopt RIC method to be applicable to large-scale production simultaneously; more specifically, the present invention relates to a kind of optical fiber and preparation method thereof.
Background technology
Along with the development of international telecommunication service, the especially fast development of Internet technology and the technology such as 3G and EPON, the demand of communication system to fiber bandwidth presents very fast rising tendency.In the communication system of long distance, Large Copacity, high rate data transmission, usually need to use fiber optical amplifier technology and wavelength-division multiplex technique, especially in backbone network and submarine communication, have higher requirement to the unrepeatered transmission distance of optical fiber and transmission capacity.But the growth of transmission capacity and distance needs higher launched power and lower fibre loss to meet distinguishable signal to noise ratio (S/N ratio) demand.And along with the increase of launched power, the nonlinear effect of optical fiber also increases greatly, so, in the transmission system of Large Copacity, two-forty, performance for Transmission Fibers proposes higher demand, is improved the object that can reach and reduce nonlinear effect by optical fiber property.
Patent documentation publication number is " a kind of large effective area fiber " of CN103257393A, provides 5 layers of waveguiding structure design, comprises two-layer sandwich layer; three layers of covering, waveguide design is too complicated, controls difficulty large; because adopting PCVD directly rod processed, optical wand size is little, is difficult to be applicable to large-scale production.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of optical fiber and preparation method thereof, optical fiber meets or surmounts G.654 ITU-T standard, uses tiretube process to be applicable to large-scale production.
The present invention is achieved in that a kind of optical fiber, and it comprises core layer and covering, covering described in described core layer outer cladding, and described covering comprises inner cladding from inside to outside successively, sink covering and surrounding layer, and described optical fiber meets following relational expression:
-0.05％＜Δ1＝n
1－n
0＜-0.05％；
-0.4％＜Δ2＝n
2－n
0＜-0.2％；
-0.6％＜Δ3＝n
3－n
0＜-0.3％；
-0.3％＜Δ4＝n
4－n
0＜-0.1％；
Wherein, n
0for pure quartzy refractive index;
N
1for the refractive index of described core layer;
N
2for the refractive index of described inner cladding;
N
3for the refractive index of described sagging covering;
N
4for the refractive index of described surrounding layer.
As the further improvement of such scheme, described doped cladding layer fluorine, described core layer does not mix germanium, and described core layer mixes fluorine and chlorine, and the doping content of fluorine and chlorine controls at≤50-500ppm.
As the further improvement of such scheme, described core layer radius r
1be 5 ~ 7um.
As the further improvement of such scheme, described inner cladding diameter r
2be 7 ~ 20um.
As the further improvement of such scheme, described sagging covering is made for mixing fluorine-based bottom tube, described sagging cladding radius r
3be 12 ~ 40um.
As the further improvement of such scheme, described surrounding layer is made for mixing the pure quartz socket tube of fluorine, described surrounding layer radius r
4be 62.5 ± 0.5um.
As the further improvement of such scheme, the material of described core layer and the material at high temperature viscosity coupling of described covering: the viscosity of material of described core layer and the viscosity of material of described covering are at 2000 DEG C of high temperature; The viscosity ratio range of the viscosity of material of described core layer and the viscosity of material of described covering is 1 ~ 1.5.Preferably, the viscosity ratio range of the viscosity of material of described core layer and the viscosity of material of described covering is 1 ~ 1.3.
As the further improvement of such scheme, the scattering coefficient α≤0.85db/km.um^4 of described optical fiber; Described optical fiber is 110 ~ 150um^2 at the useful area at 1550nm wavelength place, at the pad value≤0.180db/km at 1550nm wavelength place; Cable cut-off wavelength≤the 1530nm of described optical fiber.
The present invention also provides the method for making of above-mentioned optical fiber described in any one, described core layer, described inner cladding adopt fluorine-doped quartz pipe to be once prepared from by PCVD technique, then carry out online RIC wire drawing after assembling with low-refraction sleeve column, wherein, described core layer is fluorine, chlorine co-doped; Described covering is with C
2f
6or SiF
6as mixing fluorine raw material, at described fluorine-doped quartz inside pipe wall gas-phase reaction deposition fluorine-doped quartz layer, successively form described inner cladding, described sagging covering and described surrounding layer successively and make the refractive index of described inner cladding, described sagging covering and described surrounding layer reach n successively simultaneously
2, n
3, n
4.
The present invention is by a kind of optical fiber structure new temporarily of design: be followed successively by core layer, inner cladding from inside to outside, sink covering and surrounding layer, the employing of core layer, inner cladding is deeply mixed fluorine pipe and is once prepared from by PCVD technique, then online RIC wire drawing is carried out after assembling with low-refraction sleeve column, production technology and waveguiding structure simply, are highly suitable for large-scale production; When PCVD prepares this type of plug, be matched cladding viscosity, sandwich layer is F, Cl co-doped, and covering is with C
2f
6or SiF
6as mixing fluorine raw material, mixing fluorine inside pipe wall gas-phase reaction deposition fluorine-doped quartz layer, successively form covering, its refractive index is made to reach required desired value, because not using Ge to adulterate in process, compared with conventional SMF, reduce the loss that Rayleigh scattering is brought fully, be conducive to the reduction of optical fiber attenuation; Introduce and deeply mix fluorine low-refraction quartz base tube, when useful area increases, good fibre-optical bending performance can be kept, improve the negative effect of the fibre-optical bending performance that the increase because of useful area brings, can reduce OH-penetrates into sandwich layer simultaneously, greatly reduces the water peak of optical fiber.
Accompanying drawing explanation
Fig. 1 is the radial section structural representation of optical fiber of the present invention.
Fig. 2 is the refractive index profile structural representation of optical fiber of the present invention.
Fig. 3 is the refractive index profile structural representation of embodiment of the present invention optical fiber.
Fig. 4 is the process chart that the present invention manufactures optical fiber.
Fig. 5 is the schematic diagram after the online RIC of embodiment of the present invention optical fiber has assembled.
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.
See also Fig. 1, Fig. 2 and Fig. 3, optical fiber of the present invention comprises core layer 1 and covering, covering described in described core layer outer cladding.Described covering comprises inner cladding 2 from inside to outside successively, sink covering 3 and surrounding layer 4.
Core layer 1 does not mix Ge, but for avoiding core layer 1 to cause optical fiber attenuation to increase with the viscosity mismatch of inner cladding 2, core layer 1 can be mixed F and Cl on a small quantity and be carried out matched cladding viscosity, core layer 1 doping content control≤50-500ppm, described core layer 1 refractive index n
1close to pure quartzy refractive index n
0, refractive index contrast Δ 1=n
1-n
0≈-0.05% ~ 0.05%, core layer 1 radius r
1be 5 ~ 7um.In below introducing, relative index of refraction is all with pure quartzy refractive index n
0for reference.
Doped cladding layer fluorine, core layer 1 outer cladding inner cladding 2, described inner cladding 2 radius r
2be 7 ~ 20um, refractive index contrast Δ 2=n
2-n
0for-0.4% < Δ 2 <-0.2%; The covering 3 that sink is made for mixing fluorine-based bottom tube, described sagging covering 3 radius r
3be 12 ~ 40um, refractive index contrast Δ 3=n
3-n
0for-0.6% < Δ 3 <-0.3%; Outermost layer is surrounding layer 4, and described surrounding layer 4 is that high-purity fluorine-doped quartz sleeve pipe is made, surrounding layer 4 radius r
4be 62.5 ± 0.5um.Described surrounding layer 4 refractive index contrast Δ 4=n
4-n
0for-0.3% < Δ 3 <-0.1%.Wherein, n
2for the refractive index of described inner cladding 2; n
3for the refractive index of described sagging covering 3; n
4for the refractive index of described surrounding layer 4.
Core layer 1 material and clad material high temperature viscosity coupling, core layer 1 viscosity of material and clad material viscosity are near 2000 DEG C, and both ratio ranges are 1 ~ 1.5, and preferably 1 ~ 1.3.
Adopt the optical fiber of structure of the present invention, scattering coefficient α≤the 0.85db/km.um^4 of described optical fiber, described optical fiber is 110 ~ 150um^2 at the useful area at 1550nm wavelength place, at the pad value≤0.180db/km at 1550nm wavelength place, cable cut-off wavelength≤the 1530nm of described optical fiber, described optical fiber macrobending loss meets G.657A1 standard.
See also Fig. 4 and Fig. 5, wherein, Fig. 4 is before this type optical fiber of exploitation, uses Fiber CAD Software for Design fibre-optic waveguide structure, makes the optical parametric designing optical fiber meet design standards by analog simulation; In Fig. 5, non-wire drawing is front has assembled rear preform, low-refraction sleeve column 11, plug 12 (PCVD preparation), quartz glass bar 13, the large tail pipe 14 of recyclable quartz, the little tail pipe 15 of recyclable quartz.Consider that end wire drawing utilization factor is very low, therefore directly substitute with the quartz glass bar (13) of 100mm, while economizing on the use of funds, also carry out energy-saving and emission-reduction.
Described core layer 1, described inner cladding 2 adopt fluorine-doped quartz pipe to be once prepared from by PCVD technique, carry out online RIC wire drawing after then assembling with low-refraction sleeve column, and wherein, described core layer 1 is F, Cl co-doped; Described covering is with C
2f
6or SiF
6as mixing fluorine raw material, at described fluorine-doped quartz inside pipe wall gas-phase reaction deposition fluorine-doped quartz layer, successively form described inner cladding 2, described sagging covering 3 and described surrounding layer 4 successively and make the refractive index of described inner cladding 2, described sagging covering 3 and described surrounding layer 4 reach n successively simultaneously
2, n
3, n
4.
Core layer 1, inner cladding 2 and sagging covering 3 adopt the manufacture of PCVD method, adopt fluorine-doped quartz pipe as chemical gas phase reaction deposited tube, adopt SiCl
4as SiO
2raw material, C
2f
6or SiF
4as mixing fluorine raw material, first at deposited tube inwall gas-phase reaction deposition fluorine-doped quartz layer, successively form covering; Change the flow of chemical reaction gas, that reduces sedimentary deposit mixes Funing tablet, meanwhile, regulates the ratio of reacting gas and the translational speed of reaction zone, can improve the concentration of mixing chlorine, obtained core layer 1 of mixing fluorine chlorine altogether; Finally, high temperature melting is shortened into after plug (band inner cladding and sagging covering) is assembled with high-purity fluorine-doped quartz sleeve column and directly carry out high temperature wire drawing (being commonly called as " online RIC method ").
The present invention utilizes PK2200 to carry out test confirmation to Fiber Optical Parametric, and the added losses of measuring fiber under the differently curved radius of 1550nm and 1625nm wavelength; Utilize OTDR to measure optical fiber attenuation, recycling NR9200 tests Refractive Index Profile of Optical.
From above embodiment, can illustrate that the requirement of ITU-T G.654 standard can be accomplished to meet completely in the optical parametric of optical fiber of the present invention such as the aspects such as mode field diameter, cutoff wavelength and fibre loss, and bending property is better than the requirement of G.654 standard greatly, on this basis, useful area can reach more than 120 square microns, and this process route is ripe, stable, is very easy to carry out mass production.Useful area and the important performance index of bending loss these two can reach simultaneously optimize as much as possible by the present invention.This is extremely important apart from jumbo high-speed transfer for long, there is outstanding bending property simultaneously, not only can save the laid down cost of optical fiber telecommunications system, also reduce in laying work the harmful effect that communication system performance causes, there is important using value.
The present invention is by a kind of optical fiber structure new temporarily of design: be followed successively by core layer, inner cladding from inside to outside, sink covering and surrounding layer, the employing of core layer, inner cladding is deeply mixed fluorine pipe and is once prepared from by PCVD technique, then online RIC wire drawing is carried out after assembling with low-refraction sleeve column, production technology and waveguiding structure simply, are highly suitable for large-scale production; When PCVD prepares this type of plug, be matched cladding viscosity, sandwich layer is F, Cl co-doped, and covering is with C
2f
6or SiF
6as mixing fluorine raw material, mixing fluorine inside pipe wall gas-phase reaction deposition fluorine-doped quartz layer, successively form covering, its refractive index is made to reach required desired value, because not using Ge to adulterate in process, compared with conventional SMF, reduce the loss that Rayleigh scattering is brought fully, be conducive to the reduction of optical fiber attenuation; Introduce and deeply mix fluorine low-refraction quartz base tube, when useful area increases, good fibre-optical bending performance can be kept, improve the negative effect of the fibre-optical bending performance that the increase because of useful area brings, can reduce OH-penetrates into sandwich layer simultaneously, greatly reduces the water peak of optical fiber.
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. an optical fiber, it comprises core layer and covering, and covering described in described core layer outer cladding, is characterized in that: described covering comprises inner cladding from inside to outside successively, sink covering and surrounding layer, and described optical fiber meets following relational expression:
-0.05％＜Δ1＝n
1－n
0＜-0.05％；
-0.4％＜Δ2＝n
2－n
0＜-0.2％；
-0.6％＜Δ3＝n
3－n
0＜-0.3％；
-0.3％＜Δ4＝n
4－n
0＜-0.1％；
Wherein, n
0for pure quartzy refractive index;
N
1for the refractive index of described core layer;
N
2for the refractive index of described inner cladding;
N
3for the refractive index of described sagging covering;
N
4for the refractive index of described surrounding layer.
2. optical fiber according to claim 1, is characterized in that: described doped cladding layer fluorine, and described core layer does not mix germanium, and described core layer mixes fluorine and chlorine, and the doping content of fluorine and chlorine controls at≤50-500ppm.
3. optical fiber according to claim 1, is characterized in that: described core layer radius r
1be 5 ~ 7um.
4. optical fiber according to claim 1, is characterized in that: described inner cladding diameter r
2be 7 ~ 20um.
5. optical fiber according to claim 1, is characterized in that: described sagging covering is made for mixing fluorine-based bottom tube, described sagging cladding radius r
3be 12 ~ 40um.
6. optical fiber according to claim 1, is characterized in that: described surrounding layer is made for mixing the pure quartz socket tube of fluorine, described surrounding layer radius r
4be 62.5 ± 0.5um.
7. optical fiber according to claim 1, is characterized in that: the material of described core layer and the material at high temperature viscosity coupling of described covering: the viscosity of material of described core layer and the viscosity of material of described covering are at 2000 DEG C of high temperature; The viscosity ratio range of the viscosity of material of described core layer and the viscosity of material of described covering is 1 ~ 1.5.
8. optical fiber according to claim 7, is characterized in that: the viscosity ratio range of the viscosity of material of described core layer and the viscosity of material of described covering is 1 ~ 1.3.
9. optical fiber according to claim 1, is characterized in that: the scattering coefficient α≤0.85db/km.um^4 of described optical fiber; Described optical fiber is 110 ~ 150um^2 at the useful area at 1550nm wavelength place, at the pad value≤0.180db/km at 1550nm wavelength place; Cable cut-off wavelength≤the 1530nm of described optical fiber.
10. the method for making of an optical fiber as in one of claimed in any of claims 1 to 9, it is characterized in that: described core layer, described inner cladding adopt fluorine-doped quartz pipe to be once prepared from by PCVD technique, then online RIC wire drawing is carried out after assembling with low-refraction sleeve column, wherein, described core layer is fluorine, chlorine co-doped; Described covering is with C
2f
6or SiF
6as mixing fluorine raw material, at described fluorine-doped quartz inside pipe wall gas-phase reaction deposition fluorine-doped quartz layer, successively form described inner cladding, described sagging covering and described surrounding layer successively and make the refractive index of described inner cladding, described sagging covering and described surrounding layer reach n successively simultaneously
2, n
3, n
4.
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|---|---|---|---|
| CN201410487441.9A CN104216045A (en) | 2014-09-22 | 2014-09-22 | Optical fiber and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410487441.9A CN104216045A (en) | 2014-09-22 | 2014-09-22 | Optical fiber and manufacturing method thereof |
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| CN104216045A true CN104216045A (en) | 2014-12-17 |
Family
ID=52097737
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223645A (en) * | 2015-11-03 | 2016-01-06 | 江苏亨通光电股份有限公司 | A kind of low loss fiber and preparation method thereof |
| CN105527675A (en) * | 2014-10-21 | 2016-04-27 | Ofs菲特尔有限责任公司 | Low loss optical fiber and method of making the same |
| CN106019470A (en) * | 2016-06-14 | 2016-10-12 | 长飞光纤光缆股份有限公司 | Ultra-low-attenuation single-mode optical fiber |
| CN108055866A (en) * | 2015-09-15 | 2018-05-18 | 康宁股份有限公司 | The low bend loss single mode optical fiber of covering is just being adulterated with chlorine |
| CN108680990A (en) * | 2018-04-25 | 2018-10-19 | 烽火通信科技股份有限公司 | A kind of low crosstalk orbital angular momentum Transmission Fibers and its manufacturing method |
| CN112051640A (en) * | 2020-07-08 | 2020-12-08 | 普天线缆集团有限公司 | Ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN112649916A (en) * | 2020-12-25 | 2021-04-13 | 长飞光纤光缆股份有限公司 | Dispersion compensation optical fiber and module for miniaturized device |
| WO2022016700A1 (en) * | 2020-07-23 | 2022-01-27 | 江苏亨通光纤科技有限公司 | Compressive stress optical fibre and manufacturing process therefor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527675A (en) * | 2014-10-21 | 2016-04-27 | Ofs菲特尔有限责任公司 | Low loss optical fiber and method of making the same |
| CN108055866A (en) * | 2015-09-15 | 2018-05-18 | 康宁股份有限公司 | The low bend loss single mode optical fiber of covering is just being adulterated with chlorine |
| CN108055866B (en) * | 2015-09-15 | 2021-02-09 | 康宁股份有限公司 | Low bend loss single mode optical fiber with chlorine positively doped cladding |
| CN105223645A (en) * | 2015-11-03 | 2016-01-06 | 江苏亨通光电股份有限公司 | A kind of low loss fiber and preparation method thereof |
| CN106019470A (en) * | 2016-06-14 | 2016-10-12 | 长飞光纤光缆股份有限公司 | Ultra-low-attenuation single-mode optical fiber |
| CN108680990A (en) * | 2018-04-25 | 2018-10-19 | 烽火通信科技股份有限公司 | A kind of low crosstalk orbital angular momentum Transmission Fibers and its manufacturing method |
| CN112051640A (en) * | 2020-07-08 | 2020-12-08 | 普天线缆集团有限公司 | Ultra-low loss G.654E optical fiber and manufacturing method thereof |
| WO2022016700A1 (en) * | 2020-07-23 | 2022-01-27 | 江苏亨通光纤科技有限公司 | Compressive stress optical fibre and manufacturing process therefor |
| CN112649916A (en) * | 2020-12-25 | 2021-04-13 | 长飞光纤光缆股份有限公司 | Dispersion compensation optical fiber and module for miniaturized device |
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Effective date of registration: 20161208 Address after: 215200 Suzhou Economic Development Zone, Wujiang, ancient road, to the south of the city of Jiangsu Applicant after: JIANGSU HENGTONG PHOTOCONDUCTIVE NEW MATERIALS CO., LTD. Address before: The economic development zone of Wujiang District of Suzhou City, Jiangsu province 215200 Heng Road No. 100 Applicant before: Jiangsu Hengtong Photoelectric Co., Ltd. |
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Application publication date: 20141217 |