CN102153275A - Method for manufacturing bent insensitive optical fiber preformed rod - Google Patents
Method for manufacturing bent insensitive optical fiber preformed rod Download PDFInfo
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- CN102153275A CN102153275A CN2010106060900A CN201010606090A CN102153275A CN 102153275 A CN102153275 A CN 102153275A CN 2010106060900 A CN2010106060900 A CN 2010106060900A CN 201010606090 A CN201010606090 A CN 201010606090A CN 102153275 A CN102153275 A CN 102153275A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01413—Reactant delivery systems
- C03B37/0142—Reactant deposition burners
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/22—Radial profile of refractive index, composition or softening point
- C03B2203/23—Double or multiple optical cladding profiles
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/50—Multiple burner arrangements
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Abstract
The invention discloses a method for manufacturing a bent insensitive optical fiber preformed rod, and belongs to an optical communication technology. The bent insensitive optical fiber preformed rod prepared by the prior art has the defects of insufficient bending performance, high optical fiber attenuation, high OH- content, low optical fiber mechanical strength, complex process and the like. When a core rod is manufactured by using a vapor axial deposition (VAD) process, 1 to 2 paths of blast lamps for synchronously depositing a doped layer are increased according to the profile of the designed optical fiber preformed rod, a coating is manufactured on the vitrified core rod by using an outside vapor deposition (OVD) process or a sleeve process, and finally the bent insensitive optical fiber preformed rod is obtained. The optical fiber preformed rod prepared by the method has the advantages of low optical fiber attenuation, low OH- content, high mechanical strength and the like; the method can manufacture the required structure model according to the requirement; the optical fiber drawn by using the manufactured optical fiber preformed rod has excellent bending performance, and is suitable for the application occasions of fiber to the home (FTTH) access, small optical devices, optical cables with small bending radius requirements and the like.
Description
Technical field
The invention belongs to optical communication technique, be specifically related to a kind of bend-insensitive optical fiber prefabricated stick producing method method.The bend-insensitive preform that this method is made has excellent bending property, and low, the OH that decays
-Content is low, physical strength is high, is applicable to FTTH access, miniaturization optical device, the application scenarios such as optical cable of small-bend radius requirement are arranged.
Background technology
Perfect gradually along with networks such as backbone network, toll networks, and states such as Japan, the U.S. demand that FTTH is built, after 2003, connecting network has become topmost demand with the demand of optical fiber cable.And because of the characteristics of connecting network, the usage quantity of its optical fiber will be 5～10 times of Metropolitan Area Network (MAN), 25～50 times of optical cable backbone, annual market capacity is up to exceeding 100 billion, FTTH will will become the first-elected power of optical fiber cable industry undisputedly, will become another big cake of opening up after the backbone is with cable.The FTTH of China just enters the starting stage, and according to the experience of development FTTH such as Japan, the U.S., in the ensuing growth that was about to welcome explosive type in 5 ~ 10 years, its market application foreground is wide, has very strong realistic meaning.
And the development of the FTTH optical fiber of Japan early, just began a large amount of layings in 2003, up-to-date at that time ITUG.657 standard is not formally announced as yet, mostly be G.657A standard (be equivalent to 2009 new standard in G.657A1) of old versions in 2006 so FTTH uses, bending loss is relatively large, and performance is not optimum.The Coring FTTH optical fiber that U.S. FTTH adopts adopts auxilliary hollow structure, and its fiber strength can not satisfy the strict demand of domestic operator.China operator is because start late, so wish to adopt compatible and technical up-to-date G657 optical fiber, this design to optical fiber is had higher requirement.
The optical fiber cable that connecting network is used is mainly used in small-bend radius wiring occasion in the buildings, in order to have guaranteed the good signal transmission, require optical fiber that lower bending loss must be arranged, in order to prevent that optical fiber cable is in long-term small-bend radius state and issues the fine fracture of the third contact of a total solar or lunar eclipse, also require optical fiber to have higher fatigue strength simultaneously simultaneously.So FTTH has higher requirement to the bending loss and the physical strength of optical fiber.Based on this, the ITU of Union Internationale des Telecommunications is in November, 2009, issued " connecting network with bending loss insensitive optical fiber " standard of latest edition, its main characteristic be exactly under littler bending radius bending loss do not increase, the requirement of bending property is further significantly improved.
The technology of making the insensitive preform of optical fiber at present mainly contains VAD, OVD, MCVD, PCVD, and VAD and OVD belong to external deposition method, and MCVD and PCVD all belong to sedimentation in the pipe.Sedimentation is limit by technology in the pipe, and the attenuation by absorption of water peak is big, and the manufacturing cost height, is not suitable for the mass-producing manufacturing.The optical fiber that preform is drawn obtains better bending property, satisfy the IUT.T of version Union Internationale des Telecommunications standard in 2009 (referring to the b curve among Fig. 3, this curve is represented the G.657 bending loss standard of A2/B2), existing common step change type optical fiber can not meet the demands, must carry out brand-new optical fibre refractivity section design, make it to possess more excellent bending property, the optical fiber minimum bending radius that obtains reaches 7.5mm, bending loss≤0.5dB/Km/Km@1550nm, when bending radius is 10mm, bending loss≤0.1dB/Km/Km@1550nm, and compatible fully with common G.652DC/D optical fiber.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome technology to make big, the OH of bending property deficiency, optical fiber attenuation that the bend-insensitive preform exists
-Content height, mechanical fiber optic intensity are low, and problem such as complex process.A kind of manufacture method of bend-insensitive preform is provided, so that the optical fiber that the preform that makes draws has excellent bending property, and low, the OH that decays
-Content is low, physical strength is high, and is easy to the technology realization.
Realize purpose of the present invention for this reason, the technical scheme that the manufacture method of bend-insensitive preform of the present invention adopts is: when making plug with VAD technology, section according to the preform that designs increases the deposition that 1～No. 2 blowtorch carries out doped layer synchronously, after this on the plug after the vitrifying, make covering with OVD technology or sleeve pipe technology, obtain the bend-insensitive preform at last.The preform that this method makes is decayed and OH-content is low, physical strength is high; And can obtain various structure type by being provided with of blowtorch, can obtain excellent bending property.
As to further the improving and replenishing of technique scheme, the present invention also comprises following additional technical feature, so that select for use as required when stating technical scheme on the implementation.
The medullary ray angle of the sensing of the blowtorch of described increase and plug is 0～90 °.
The position of the blowtorch of described increase is in the optional position of plug circumference.
The doped layer that the blowtorch of controlling described increase is controlled formation with respect to the position and the angle of described plug near or away from the sandwich layer of plug.
Unstripped gas is set on the blowtorch of described increase sprays runner, impurity gas injection runner, inflammable gas ejectisome runner and combustion-supporting gas injection runner, each sprays runner and all points to same point on the plug medullary ray, sprays runner and sprays unstripped gas, impurity gas, inflammable gas and combustion-supporting gas by each.
The blowtorch of described increase is made by quartz or pottery or metal, and its profile is circle or ellipse or rectangle.
The section of described preform is sagging type of depressed cladding type or covering or the sagging type of double clad.
According to such scheme,, can obtain excellent bending property and have extremely low decay and OH by accurate control and adjustment to Refractive Index Profile o
-Attenuation by absorption.The optical fiber that the preform that the inventive method is made draws, during minimum bending radius 7.5mm, bending loss≤0.5dB/Km/Km@1550nm, when bending radius is 10mm, bending loss≤0.1dB/Km/Km@1550nm, and 1310nm decay≤0.35dB/Km/Km, 1550nm decay≤0.21dB/Km/Km, OH
-Attenuation by absorption≤0.35dB/Km/Km.
The invention has the beneficial effects as follows:
1, manufacture method of the present invention when VAD technology is made plug, increases the deposition that 1～No. 2 blowtorch carries out doped layer synchronously, technology is simple, produce easily and quality control, significantly improve the manufacturing efficient that VAD technology is made the bend-insensitive preform, be suitable for making in batches.
2, manufacture method of the present invention, doped layer can be as required near or away from sandwich layer, can easily obtain required optical fiber structure, accurate controllability in conjunction with the refractive index distribution, can obtain designed optical fiber property expeditiously, the optical fiber that the manufacturing preform draws has excellent bending property and low decay and low OH concurrently
-The characteristic of absorption loss.
3, manufacture method of the present invention has been taken into account the composition and the processing of fiber optic materials, is optimized coupling by viscosity and stress to material, and is stress-retained little, and the physical strength of optical fiber is improved.
4, the bend-insensitive preform made of the inventive method, its optic fibre characteristic satisfies version newest standards in 2009 requirement comprehensively, is suitable for the miniaturization optical device, the application scenarios such as optical cable of small-bend radius requirement are arranged.And have low splice loss, splice attenuation during with the conventional fiber welding, compatible functional.
Description of drawings
Fig. 1 is the synoptic diagram that the inventive method is provided with 1～2 doping blowtorch.
Fig. 2 a is the synoptic diagram of conventional step change type optical fiber structure.
Fig. 2 b is the synoptic diagram of depressed cladding type optical fiber structure of the present invention.
Fig. 2 c is the synoptic diagram of the sagging type optical fiber structure of covering of the present invention.
Fig. 2 d is the synoptic diagram of the sagging type optical fiber structure of double clad of the present invention.
Fig. 3 is an embodiment of the invention bending property distribution curve synoptic diagram.
Number in the figure explanation: 1-plug, 2-sandwich layer blowtorch, 3-covering blowtorch, the 4-first doping blowtorch, the 5-second doping blowtorch, the conventional step change type optical fiber structure of 6-, 7-depressed cladding type optical fiber structure, the 8-covering type optical fiber structure that sink, the 9-double clad type optical fiber structure that sink.
Embodiment
The present invention will be further described below in conjunction with Figure of description.
The manufacture method of bend-insensitive preform of the present invention, as shown in Figure 1, be when making plug with VAD technology, section according to the preform that designs increases the deposition that 1～No. 2 blowtorch carries out doped layer synchronously, after this on the plug after the vitrifying, make covering with OVD technology or sleeve pipe technology, obtain the bend-insensitive preform at last.
When implementing aforesaid method, select following one or multinomial measure simultaneously for use:
The sensing of the blowtorch that increases and the medullary ray angle of plug are 0～90 °.
The position of the blowtorch that increases is in the optional position of plug circumference.
The doped layer that the blowtorch that control increases is controlled formation with respect to the position and the angle of plug near or away from the sandwich layer of plug.
Unstripped gas is set on the blowtorch that increases sprays runner, impurity gas injection runner, inflammable gas ejectisome runner and combustion-supporting gas injection runner, each sprays runner and all points to same point on the plug medullary ray, sprays runner and sprays unstripped gas, impurity gas, inflammable gas and combustion-supporting gas by each.
The blowtorch that increases is made by quartz or pottery or metal, and its profile is circle or ellipse or rectangle.
The section of preform is sagging type of depressed cladding type or covering or the sagging type (referring to Fig. 2) of double clad.
The preform that aforesaid method obtains is made optical fiber, and according to the fibre-optical bending performance measurement method, in the test of 10 circles, the added losses that bending causes are at 1550nm place≤0.03dB/Km/Km at φ 30mm mandrel; At 1625nm place≤0.1dB/Km/Km; In the test of 1 circle, the added losses that bending causes are at 1550nm place≤0.1dB/Km/Km at φ 20mm mandrel; At 1625nm place≤0.2dB/Km/Km; In the test of 1 circle, the added losses that bending causes are at 1550nm place≤0.5dB/Km/Km at φ 15mm mandrel; At 1625nm place≤1.0dB/Km/Km.Bend-insensitive preform bending loss of the present invention is minimum, and (curve a is a conventional step change type optical fiber bending property G.652C/D, and bending loss is big, in Fig. 3 on the curve b in Fig. 3 under the curve b.The b curve is represented the G.657 bending loss standard of A2/B2).
The following concrete data declaration effect of the present invention by several embodiment.
Embodiment 1:
Adopt 1 doping blowtorch, make plug 1, structure type is referring to the depressed cladding type optical fiber structure 7 among Fig. 2 a, then by OVD deposition covering.
The bend-insensitive preform characteristic of gained is as follows:
Mode field diameter: 8.8～9.0 μ m;
Zero-dispersion wavelength: 1300～1324nm;
Fiber cut off wavelength: 1320 ± 10nm;
Water peak attenuation by absorption: 0.30～0.32dB/Km/km;
Macrobend φ 30mm encloses around 10:
Added losses value at 1550nm: 0.005～0.01dB/Km,
Added losses value at 1625nm: 0.05～0.1dB/Km;
Macrobend φ 20mm encloses around 1:
Added losses value at 1550nm: 0.05～0.08dB/Km,
Added losses value at 1625nm: 0.1～0.2dB/Km;
Macrobend φ 15mm encloses around 1:
Added losses value at 1550nm: 0.3～0.5dB/Km,
Added losses value at 1625nm: 0.5～1.0dB/Km.
The mode field diameter and the conventional fiber of embodiment 1 described optic fibre characteristic are approaching, and splice loss, splice attenuation is little, and be compatible good, and decay and the attenuation by absorption of water peak are functional, and bending property is better than G.657A2/B2 standard-required.
Embodiment 2:
Adopt 1 doping blowtorch, make plug 1, structure type is referring to the sagging type optical fiber structure 8 of the covering among Fig. 2 b, then by OVD deposition covering.
The bend-insensitive preform characteristic of gained is as follows:
Mode field diameter: 8.4～8.8 μ m;
Zero-dispersion wavelength: 1300～1324nm;
Fiber cut off wavelength: 1300～1350nm;
Water peak attenuation by absorption: 0.31～0.33dB/Km/km;
Macrobend φ 30mm encloses around 10:
Added losses value at 1550nm: 0.01～0.02dB/Km,
Added losses value at 1625nm: 0.05～0.1dB/Km;
Macrobend φ 20mm encloses around 1:
Added losses value at 1550nm: 0.01～0.02dB/Km,
Added losses value at 1625nm: 0.05～0.1dB/Km;
Macrobend φ 15mm encloses around 1:
Added losses value at 1550nm: 0.1～0.2dB/Km,
Added losses value at 1625nm: 0.3～0.6dB/Km.
Embodiment 3:
Adopt 1 or 2 doping blowtorch, make plug 1, structure type is referring to the sagging type optical fiber structure 9 of the double clad among Fig. 2 c, then by OVD deposition covering.
The bend-insensitive preform characteristic of gained is as follows:
Mode field diameter: 8.4～8.8 μ m;
Zero-dispersion wavelength: 1300～1324nm;
Fiber cut off wavelength: 1300～1350nm;
Water peak attenuation by absorption: 0.31～0.33dB/Km/km;
Macrobend φ 30mm encloses around 10:
Added losses value at 1550nm: 0.001～0.005dB/Km,
Added losses value at 1625nm: 0.003～0.008dB/Km;
Macrobend φ 20mm encloses around 1:
Added losses value at 1550nm: 0.005～0.01dB/Km,
Added losses value at 1625nm: 0.005～0.01dB/Km;
Macrobend φ 15mm encloses around 1:
Added losses value at 1550nm: 0.005～0.01dB/Km,
Added losses value at 1625nm: 0.01～0.02dB/Km.
------------------------------------------------------------------
Remarks (definition of terms more of the present invention):
Refractive indices is defined by following equation:
Refractive indices (%)=[(n
1 2-n
2 2)/2 n
1 2] (1)
Wherein be n
1Be the material specific refractory power of fine layer, n
2Material specific refractory power for surrounding layer.
The definition of index distribution is meant the relation of on the selected part of optical fiber specific refractory power or refringence (Δ) position ri of relative fiber optic hub with it (radius).
The decay of optical fiber is meant when going into from an end-fire of optical fiber, and when the other end penetrated, light intensity can weaken, and has been attenuated when promptly light is propagated in fiber, is called the decay of optical fiber.The size of optical fiber attenuation is defined by following equation:
A=-10 log (P
Go out/ P
Go into) (2)
P in the following formula
Go intoAnd P
Go outBe respectively the measured luminous power of optic fibre input end and output terminal.
The bending of optical fiber decay when referring to fibre-optical bending, is laid as stranding, scene under the occasions such as (pipeline turnings), fiber cable joint and is caused, light permeates covering and the optical power loss that causes from fibre core.Defining of crooked decay by following equation:
A
b=?Ae
-BR (3)
R is a bending radius in the following formula, and A, B are and optical fiber parameter (fiber core radius r1, optical fiber external diameter R, the constant that refractive indices is relevant).
The attenuation by absorption of water peak refers to contain in the fiber optic materials OH
-, absorb luminous energy and produce vibration, luminous power is lost with the form of heat, cause with regard to optical power loss.
The bending resistance of optical fiber is meant the added losses under the regulation test condition.Test process is, the loss of measuring fiber under normal operation, again according to standard-required with optical fiber on mandrel, measure loss value, the difference of two kinds of measurements is the addition bend loss that bending causes.Its specified standards test condition is included on the mandrel of radius 15mm on 10 circles, mandrel at 10mm on 1 circle and the mandrel at 7.5mm around 1 circle.Usually, the maximum permissive waste that bending causes is as the criterion with the addition bend loss of 1550nm or 1625nm, and unit is dB/Km/Km.
VAD is Vapor Axial Deposition, the abbreviation of vapor-phase axial deposition.
OVD is Outside Vapor Deposition, the abbreviation of outside gas deposition.
MCVD is Modified Chemical Vapor Deposition, the abbreviation of modified chemical vapor deposition.
PCVD is Plasma Chemical Vapor Deposiotn, the abbreviation of plasma chemical vapor deposition.
FTTH is Fiber To The Home, fiber-to-the-home abbreviation.
Claims (7)
1. the manufacture method of a bend-insensitive preform, it is characterized in that: when making plug with VAD technology, section according to the preform that designs increases the deposition that 1～No. 2 blowtorch carries out doped layer synchronously, after this on the plug after the vitrifying, make covering with OVD technology or sleeve pipe technology, obtain the bend-insensitive preform at last.
2. the manufacture method of a kind of bend-insensitive preform according to claim 1 is characterized in that: the medullary ray angle of the sensing of the blowtorch of described increase and plug is 0～90 °.
3. the manufacture method of a kind of bend-insensitive preform according to claim 1 and 2 is characterized in that: the position of the blowtorch of described increase is in the optional position of plug circumference.
4. the manufacture method of a kind of bend-insensitive preform according to claim 1 and 2 is characterized in that: the doped layer that the blowtorch of controlling described increase is controlled formation with respect to the position and the angle of described plug near or away from the sandwich layer of plug.
5. the manufacture method of a kind of bend-insensitive preform according to claim 1, it is characterized in that: unstripped gas is set on the blowtorch of described increase sprays runner, impurity gas injection runner, inflammable gas ejectisome runner and combustion-supporting gas injection runner, each sprays runner and all points to same point on the plug medullary ray, sprays runner and sprays unstripped gas, impurity gas, inflammable gas and combustion-supporting gas by each.
6. the manufacture method of a kind of bend-insensitive preform according to claim 1 is characterized in that: the blowtorch of described increase is made by quartz or pottery or metal, and its profile is circle or ellipse or rectangle.
7. the manufacture method of a kind of bend-insensitive preform according to claim 1 is characterized in that: the section of described preform is sagging type of depressed cladding type or covering or the sagging type of double clad.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060701A (en) * | 2015-07-24 | 2015-11-18 | 长飞光纤光缆股份有限公司 | Preparation method for large-sized bended insensitive multimode optical fiber preform |
| CN112897872A (en) * | 2021-01-28 | 2021-06-04 | 通鼎互联信息股份有限公司 | Manufacturing method of large mode field bending loss insensitive single mode fiber for access network |
| CN113716861A (en) * | 2021-08-11 | 2021-11-30 | 山东富通光导科技有限公司 | Method for preparing bending insensitive optical fiber by external gas phase deposition method |
| CN114349327A (en) * | 2022-01-18 | 2022-04-15 | 江苏亨通光导新材料有限公司 | Low-cost processing technology of bending insensitive single-mode optical fiber |
| CN115140932A (en) * | 2022-06-15 | 2022-10-04 | 华能(泰安)光电科技有限公司 | Bending insensitive single-mode fiber and preparation method thereof |
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| JPS62288128A (en) * | 1986-06-06 | 1987-12-15 | Furukawa Electric Co Ltd:The | Production of optical fiber preform |
| CN1847149A (en) * | 2006-05-09 | 2006-10-18 | 许增辉 | Continuous sodium hydroxide evaporating method and apparatus |
| CN101397186A (en) * | 2007-11-22 | 2009-04-01 | 富通集团有限公司 | Method for manufacturing bend insensitive optical fiber preform |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62288128A (en) * | 1986-06-06 | 1987-12-15 | Furukawa Electric Co Ltd:The | Production of optical fiber preform |
| CN1847149A (en) * | 2006-05-09 | 2006-10-18 | 许增辉 | Continuous sodium hydroxide evaporating method and apparatus |
| CN101397186A (en) * | 2007-11-22 | 2009-04-01 | 富通集团有限公司 | Method for manufacturing bend insensitive optical fiber preform |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060701A (en) * | 2015-07-24 | 2015-11-18 | 长飞光纤光缆股份有限公司 | Preparation method for large-sized bended insensitive multimode optical fiber preform |
| CN112897872A (en) * | 2021-01-28 | 2021-06-04 | 通鼎互联信息股份有限公司 | Manufacturing method of large mode field bending loss insensitive single mode fiber for access network |
| CN113716861A (en) * | 2021-08-11 | 2021-11-30 | 山东富通光导科技有限公司 | Method for preparing bending insensitive optical fiber by external gas phase deposition method |
| CN114349327A (en) * | 2022-01-18 | 2022-04-15 | 江苏亨通光导新材料有限公司 | Low-cost processing technology of bending insensitive single-mode optical fiber |
| CN115140932A (en) * | 2022-06-15 | 2022-10-04 | 华能(泰安)光电科技有限公司 | Bending insensitive single-mode fiber and preparation method thereof |
| CN115140932B (en) * | 2022-06-15 | 2024-05-17 | 华能(泰安)光电科技有限公司 | Bending insensitive single-mode optical fiber and preparation method thereof |
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| CN102153275B (en) | 2013-04-03 |
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