CN1765789A - Method for making low water peak optical fiber preformrod adopting plasm outward spraying method - Google Patents
Method for making low water peak optical fiber preformrod adopting plasm outward spraying method Download PDFInfo
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- CN1765789A CN1765789A CNA2005100194366A CN200510019436A CN1765789A CN 1765789 A CN1765789 A CN 1765789A CN A2005100194366 A CNA2005100194366 A CN A2005100194366A CN 200510019436 A CN200510019436 A CN 200510019436A CN 1765789 A CN1765789 A CN 1765789A
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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
- C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
- C03B37/01291—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention relates to a process method for LWPF prefabricated bar, and exactly relates to use plasma to spray out and prepare envelope. Wherein, using sink envelope design for the refraction index profile of bar core section with mixing fluorin 0.30-0.50wt%, the percent of mixing fluorin in sink envelope equals to mixing fluorin of bar core plus K*(delta<+>-delta<->), 0.70<=K<=1.04. The steps comprises: (1) processing the bar core; (2) using out-spray plasma method to deposit quartz powder on the core to prepare outer envelope, and obtaining the objective product. This invention special fits to product LWPF in large scale with low cost.
Description
Technical field
The present invention relates to a kind of manufacture method of preformod of optical fiber with low water peak, thereby the outer spray of specifically a kind of using plasma is equipped with the method that covering is made preformod of optical fiber with low water peak.
Background technology
Since late 1970s scale production optical fiber, preform The Study of Manufacturing Technology and perfect just the improvement never be interrupted.The preform manufacturing technology that drops into suitability for industrialized production at first mainly contains following four kinds: modified chemical vapor deposition method (MCVD), plasma enhanced chemical vapor deposition method (PCVD), pipe outside vapor deposition (OVD) and axial vapor deposition method (VAD).The manufacture method of early stage preform adopts single method, promptly only adopts a kind of technology to make prefabricated rods.Current, the technology of production prefabricated rods adopts hybrid system and tiretube process usually, promptly make prefabricated rod mandrel earlier, make covering at mandrel outer then, but to increase the wire drawing milimeter number of single prefabricated rods, particularly MCVD and PCVD belong to sedimentation in the pipe, the size of prefabricated rods is subjected to the restriction of bushing pipe can not be too big, in order to enhance productivity and to reduce the optical fiber cost, usually adopt MCVD or PCVD to make plug, become pipe (tiretube process) to make preform in the skin employing OVD method (hybrid system) of plug or at outer fit.
Increasingly mature and perfect along with each manufacturing technology all reached than higher level aspect optical fiber property, but the optical fiber price gliding day by day, and market competition is fierce day by day.In order to tackle the market pressure that the optical fiber price reduces, so require constantly to improve the overall manufacturing efficient of manufacturing process and reduce cost of raw materials used, wherein the advantage of hybrid system and tiretube process is appeared suddenly day by day.
At the surrounding layer manufacture view, adopt the outer spray method of plasma, promptly utilize plasma body that high frequency produces will natural or synthetic quartz powder to be sprayed directly into also directly to become transparent glass on the plug and form preform.Owing to adopt the sedimentation effect of this method silica powder very high, can reach more than 60%, particularly the price of natural quartz powder is relatively cheap, and the price of synthetic quartz powder also is reduction trend.In addition, compare with present widely used OVD technology, except that the sedimentation effect height, can directly become glass, saved sintering process, technology controlling and process is simple, maintenance of the equipment and environmental protection treatment expense are low, thereby the outer spray technique of plasma has tangible cost advantage.
U.S. Pat 5522007 had been introduced a kind of outside plasma deposition technique and equipment in 1996, and the method that this patent is introduced is to feed silicon tetrachloride (SiCl in flame passes
4) and oxygen (O
2), the two reacts and generates silicon-dioxide (SiO
2), because reaction and SiO
2Volatilization carry out sedimentary most of SiO simultaneously
2All vapored away, thereby SiO
2Sedimentation effect is extremely low, so this patented method does not possess cost advantage.Outside plasma in the spray technique, especially when adopting the natural quartz powder, because some impurity unavoidably in the natural quartz powder, the opticator that in a single day impurity be diffused into optical fiber will influence the performances such as decay of optical fiber.Patent US6269663B1 has introduced and fed the especially method of fluorochemical of halogenide in reaction, can effectively reduce the alkali metal content in the deposition glass, but can not effectively reduce hydroxyl (OH) content in the deposition glass, therefore the outer spray technique of plasma generally is used for the production common single mode optical fibres, but is restricted in the production application of low-water-peak fiber.Adopt the outer spray method of plasma, the OH in the deposition glass is mainly derived from two aspects, and the one, derive from starting material, comprise that quartz sand, the used pressurized air of plasma lamp and argon gas and charging are gases used etc.; The 2nd, in the deposition process, the prefabricated rods surface temperature is higher, greater than 1000 ℃, very easily adsorb in the surrounding environment OH and to excellent internal diffusion.The former can suitably reduce by raw-material drying treatment, but the latter needs ultralow wet environment, and plasma needs big exhausting will not deposit with evaporable silica powder when spraying outward to take away to guarantee deposition quality, realize ultralow wet environment, very expensive.Become today of main product in low-water-peak fiber, the plasm outward spraying technology has run into challenge, utilize the low-cost advantage of plasm outward spraying technology to prepare low-water-peak fiber, just must solve the problem of OH to the plug internal diffusion.。
In addition, depend primarily on the sedimentation effect of production efficiency and quartz sand with the cost of the made surrounding layer of plasm outward spraying.Power consumption occupies bigger ratio in the plasm outward spraying technology in cost, and the utilization ratio that improves heat that plasma body produces also is effective measure that reduce cost to reduce power consumption.In patent US6215092B1 and CN1111514C, disclose an a kind of shared producer and adopted the method and the relative unit of two plasma lamps, can increase sedimentation rate 50%, but two shared producers of plasma lamp are difficult to the two power division of balance, the stability extreme difference, one of them plasma lamp breaks down, to cause the deposition failure, scrap thereby reduced the equipment service efficiency and increased.The sedimentation effect of quartz sand depends primarily on the size distribution, plasma lamp of quartz sand with respect to the position of target rod and the external diameter of target rod.The present invention has drawn the method that can improve quartz sand sedimentation rate, sedimentation effect and heat utilization ratio that plasma body produces greatly on the basis of a large amount of experiments.
For conveniently introducing summary of the invention, the definitional part term:
Plug: the prefabricated component that contains sandwich layer and part covering.
Outsourcing: the part in the prefabricated rods beyond the plug.
Prefabricated rods: the prefabricated component that contains plug and outsourcing.
Intermediate casing: the purity quartz glass pipe for high that meets certain how much requirements.
Combination plug: molten formed prefabricated component in back and the related process together of being reduced to of plug and intermediate casing.
The target rod: the basis female rod of deposition quartz sand during plasm outward spraying can be plug, combination plug and sleeve pipe.
Assembled casing: with the intermediate casing is the target rod, and using plasma sprays prepared larger sized prefabricated component and related process outward.
The sedimentation effect of silica powder: (deposit on the target rod and change into the quality of the quality/used silica powder of qualified glass) * 100%.
Refractive index profile: the relation between optical fiber or preform (comprising plug) glass refraction and its radius.
Relative refractive index: be defined as follows,
Δ %=[(n
1 2-n
0 2)/2n
1 2] * 100%, n1 and n0 are respectively the specific refractory power of two kinds of glass materials.
The refractive index contrast Δ
-: as following formula, work as n in this application
1Be the cladding index of sinking, n
0Definition Δ during for the pure silicon dioxide glass refraction
-
The refractive index contrast Δ
+: as following formula, work as n in this application
1Be sandwich layer specific refractory power, n
0Definition Δ during for the pure silicon dioxide glass refraction
+
B/a value: the ratio that is defined as sedimentary sagging cladding diameter and sandwich layer diameter in pipe.
C/a value: the ratio that is defined as diameter of mandrel and sandwich layer diameter.
Bushing pipe: the purity quartz glass pipe for high that vapour deposition is used in the pipe, reactant is deposited on the inwall of Glass tubing behind inner reaction tube.
RIT: plug is inserted the preform of forming in the sleeve pipe.
Sleeve pipe: meet certain sectional area requirement, insert the heavy wall purity quartz glass pipe for high that directly to form prefabricated rods behind the RIT.
Summary of the invention
Technical problem to be solved by this invention is: at the problem that current plasm outward spraying method exists in making the low-water-peak fiber process, spray is equipped with the method that covering is made preformod of optical fiber with low water peak outside a kind of using plasma thereby provide.
Technical scheme of the present invention is achieved in that the section index distribution of plug adopts the blanket design of sinking:
Δ
-=-0.04--0.01%, Δ
+=0.310-0.350%, b/a 〉=2.3, c/a 〉=3.9, sandwich layer mix fluorine weight percentage=0.30%-0.50%; Sink covering mix fluorine weight percentage=sandwich layer mix fluorine weight percentage+K * (Δ
+-Δ
-), 0.70≤K≤1.04, its concrete steps are the plug that (1) adopts arbitrary prepared said structure; (2) the outer spray method of using plasma is deposited on silica powder and prepares surrounding layer on the plug, promptly makes preformod of optical fiber with low water peak.Described plug preferably adopts the PCVD prepared.
Another preferred version of the present invention is that one or more snippets plug that above-mentioned steps (1) prepares is inserted in intermediate casing, on the stretching tower, with fluorine-containing gas and assist gas mandrel outer surface and intermediate casing internal surface are corroded earlier, with its molten being reduced to together, obtain making up plug then; The outer spray method of using plasma is sprayed directly into silica powder on the combination plug and makes preformod of optical fiber with low water peak then.
The another preferred version of the present invention is: at first the outer spray method of using plasma is sprayed directly into silica powder and makes assembled casing on the intermediate casing; Adopt tiretube process that the plug insertion assembled casing of described step (1) preparation is made preformod of optical fiber with low water peak then.
The concrete technology and the step of plasm outward spraying method of the present invention are as follows: silica powder feeder sleeve and plasma lamp are fixed on the hot support of retaining, plasma lamp is 45 degree obliquely, its position with respect to the target rod can be adjusted, the silica powder feeder sleeve also can be adjusted with respect to the position of plasma lamp, and silica powder feeder sleeve and plasma lamp alignment targets rod are deposited; The tilt angle alpha of silica powder feeder sleeve is 45 degree, can slightly adjust with the size-grade distribution of silica powder and the velocity of discharge of silica powder.In the deposition process, carry out along with sedimentary, the increase of target rod 10 external diameters, the position of plasma lamp 8 can oblique 45 directions down be moved, and target rod 10 is fixed on can be around its axial rotation with in axial direction with respect to the plasma lamp translation on the lathe.
Ultimate principle of the present invention is as follows:
As stated in the Background Art, in the plasm outward spraying technology, not only OH content is higher in the sedimentary glass of institute, can cause that also OH in the environment is attracted on the target rod and to internal diffusion, in case OH is diffused into the increase that the sandwich layer of prefabricated rods will cause optical fiber water peak.Owing to be difficult to solve this problem by the optimization of the external spray technique of article on plasma, the present invention can effectively stop the sandwich layer diffusion of OH to prefabricated rods by the design to plug.The sandwich layer that can OH inwardly be diffused into prefabricated rods depends primarily on diffusion length and spread coefficient.The method that increases diffusion length is exactly the c/a value that increases plug, increases the manufacturing cost that the c/a value can increase plug.Experiment shows, mixes fluorine in the fibre cladding and can effectively stop the diffusion of outside hydroxyl to sandwich layer, keeps the low hydroxyl state of sandwich layer.Corresponding reaction equation is:
Adopt PCVD technology can carry out fluorine accurately and mix, mix the water peak that fluorine can also reduce the hydroxyl in the PCVD settled layer and then reduce optical fiber in the optical fiber.Under action of plasma, F has higher deposition efficiency, can reach more than 90%, and for OVD and VAD technology etc., in the deposition process, the sedimentation effect of F is extremely low, and great majority are mixed F and carried out in sintering process (as feeding SiF
4), but be subjected to the restriction of deposit thickness, and need to adopt repeatedly deposition-agglomerating method, complex process, cost is higher.Thereby mixing aspect the F, PCVD technology has remarkable advantages.The present invention utilizes the process advantage of PCVD just, introducing F at the covering of plug mixes, OH that adsorbs from environment during with the prevention plasm outward spraying and the OH in the made silica glass of plasm outward spraying are to the diffusion of sandwich layer, in conjunction with an amount of c/a that increases, can be directly on this plug outside the using plasma spray technique prepare covering with the production low-water-peak fiber.
Outside using plasma in the spray technique, when with the natural quartz powder, the silica powder composition often along with batch difference certain fluctuation is arranged, plasm outward spraying prepared outsourcing viscosity and specific refractory power are fluctuateed, and then influence characteristics such as the cutoff wavelength of optical fiber and decay, cause drawing process complicated.Experiment shows, utilizes PCVD technology that the material composition and the refractive index profile of plug are designed, and can well solve the problem of viscosity and refractive index match, thereby allow the silica powder composition that certain fluctuation takes place.
Simultaneously, the same with OVD technology, the sedimentation effect of silica powder increases with the increase of target rod outside diameter.When the target rod outside diameter hour because the sedimentation effect of silica powder is low, its cost is higher, is higher than to adopt the prepared synthetic quartz glass of OVD technology.Adopt the technology of combination plug or assembled casing, can further reduce the manufacturing cost of prefabricated rods.
In combination plug and assembled casing technology, higher when used synthetic mesophase sleeve pipe ratio in whole prefabricated rods, be not less than at 25% o'clock, can select for use by any technology, comprise MCVD, PCVD, OVD and VAD preparation and with the low water peak plug of its geometric match.The major advantage of combination plug and assembled casing technology be at the sedimentation effect that improves silica powder with when reducing plasma and spray made outsourcing cost outward, do not need to increase the c/a value of plug, thereby make prefabricated rods have lower cost.Combination plug and assembled casing technology advantage in making large size prefabricated rod is more obvious, both effectively solved PCVD and MCVD technology are subjected to the bushing pipe restriction when making large size prefabricated rod mandrel problem, and made the higher covering that makes of average deposition efficient of outsourcing have lower cost again.And large size prefabricated rod not only self cost is low, also can improve wire drawing efficient, also be to reduce comparatively effective means of optical fiber cost at present.
In addition, for plasm outward spraying, high deposition rate and high sedimentation effect are to guarantee basis cheaply.Experiment shows, with a plasma lamp, adopts the above plasma power of 80KW, can realize the sedimentation rate that 20g/min is above, the stability of integrated equipment and manufacturing cost, and the power of plasma body is best at 80KW to 120KW.For the utilization ratio that improves heat that plasma body produces and the sedimentation effect of silica powder, plasma lamp need constantly be adjusted according to the size-grade distribution of silica powder, the external diameter and the different of sedimentation rate of target rod with respect to the position of target rod.Use method provided by the invention, can prepare ITU-TG.652.C/D optical fiber, all less than 0.344dB/km, the attenuation at 1550nm place is less than 0.224dB/km in the attenuation at 1310nm and 1383nm place for prepared optical fiber.Press the hydrogen loss testing method of IEC regulation, at ambient temperature optical fiber being placed the hydrogen dividing potential drop is 0.01 atmosphere, the attenuation increase at continuous monitoring optical fiber 1240nm place.When 1240nm place attenuation increases above behind the 0.03dB/km optical fiber is taken out from this atmosphere, test the attenuation at 1383nm place after 14 days under normal operation, the attenuation increase of this optical fiber is no more than 0.01dB/km.
The present invention is on the basis of a large amount of experiments, solved the deficiency that current plasma body exists effectively in making low-water-peak fiber, be designed into plasm outward spraying from plug a kind of brand-new Technology is provided, it combines the plug manufacturing technology and the cheap surrounding layer manufacturing technology of cheapness, very the low cost production low-water-peak fiber is particularly suited for scale operation.In addition, be not limited to method provided by the invention and prepare G.652.C/D optical fiber, any single-mode fiber can be realized in this way.
To provide detailed embodiment below, use range of the present invention will become apparent.But, should be understood that these are used for illustrating that the specific embodiment of the preferred embodiments of the invention only is used for illustrating, because various variations within the spirit and scope of the present invention and change are conspicuous for those skilled in the art.
Description of drawings
Fig. 1 is a plug refractive index profile synoptic diagram
Fig. 2 is the graph of a relation of PCVD plug center core layer doping F amount and covering doping F amount
Fig. 3 is a combination mandrel process synoptic diagram
Fig. 4 is the assembled casing process schematic representation
Fig. 5 is plasma lamp and the feeder sleeve position view with respect to the target rod
Fig. 6 is the variation diagram of the blanking velocity of silica powder with the target rod outside diameter
Fig. 7 is the variation diagram of the sedimentation effect of silica powder with the target rod outside diameter
Embodiment
It is as follows that plasm outward spraying prepares outsourcing technology: as shown in Figure 5, silica powder feeder sleeve 7 and plasma lamp 8 are fixed on the hot support 9 of retaining, plasma lamp 8 is 45 degree obliquely, and its position with respect to target rod 10 can be adjusted.The silica powder feeder sleeve also can be adjusted with respect to the position of plasma lamp 8, to guarantee that silica powder can arrive plasma flame district and the feed mouth of pipe smoothly not by scaling loss, angle [alpha] is that 45 degree are best, can slightly adjust with the size-grade distribution of silica powder and the velocity of discharge of silica powder.In the deposition process, carry out along with sedimentary, the increase of target rod 10 external diameters, the position of plasma lamp 8 can oblique 45 directions down be moved, target rod 10 is fixed on the lathe can be around its axial rotation with in axial direction with respect to the plasma lamp translation, and the height of target rod 10 is immovable in deposition process.The height of adjusting plasma lamp in the deposition process can be simplified the structure of lathe greatly with respect to the height of adjusting the target rod, is more suitable for making large preform rod or the assembled casing of external diameter greater than 100mm.
Adopting the natural quartz powder is starting material, adopt single plasma lamp, the power of plasma body is 105KW, and before the blanking, the plasma flame of using 50KW earlier is with surperficial preheating of target rod and polishing 1 to 2 time, increase power then gradually, after equipower is stabilized to 105KW, the beginning blanking, the blanking velocity of silica powder is with the adjustment of target rod as shown in Figure 6, after the external diameter of target rod reaches 100mm, keep the blanking velocity of 2500g/h.The moving speed of the translation of target rod is the 10-60 mm/min, and reduces gradually with the increase of target rod outside diameter, and the rotating speed of target rod is 10-30 rev/min, behind every deposition one deck, adjusts the position of plasma lamp with respect to the target rod before revolution.By this technology, can obtain higher deposition efficiency, the sedimentation effect of silica powder with the variation of target rod outside diameter as shown in Figure 7, after the target rod outside diameter was greater than 75 millimeters, sedimentation effect can reach more than 80%.
As shown in Figure 1, the section index distribution of plug of the present invention adopts the design of the covering that sink: Δ
-=-0.04--0.01%, Δ
+=0.310-0.350%, b/a 〉=2.3, c/a 〉=3.9 when b/a value hour, can increase the c/a value by the CSA that increases substrate tube.Sandwich layer mix fluorine weight percentage (wt%)=0.30%-0.50%; The fluorine weight percentage (wt%) of mixing of sagging covering is not less than 0.45%, with the fluctuation eliminating outsourcing material and the form influence to optical fiber attenuation and cutoff wavelength, the relation of the two is as follows in order to ensure the viscosity of plug center core layer and sagging covering coupling: the covering that sink mix fluorine weight percentage (wt%)=sandwich layer mix fluorine weight percentage+K * (Δ
+-Δ
-), K is a coefficient, 0.70≤K≤1.04.Get Δ
-=-0.02%, Δ
+=0.330%, the fluorine weight percentage of mixing of the covering that then sink changes as shown in Figure 2 with the fluorine weight percentage of mixing of sandwich layer.
The combination mandrel process earlier with plug 1 and high-purity intermediate casing 2 molten being reduced to together of synthetic, thereby makes the bigger combination plug 3 of external diameter as shown in Figure 3, carries out the plasm outward spraying deposition then and obtain final prefabricated rods 4 on the combination plug.
Assembled casing technology is as shown in Figure 4: directly carry out the plasm outward spraying deposition and make sleeve pipe 5 on intermediate casing 2, plug 1 and sleeve pipe 5 are assembled into promptly obtain together supplying stringy prefabricated rods 6 then.
Embodiment one: PCVD plug+plasm outward spraying
With PCVD prepared plug, the external diameter of used bushing pipe is 31mm, and wall thickness is 2 millimeters.Using plasma sprays outward silica powder is sprayed directly into and makes preform on the plug then.The parameter of plug and prefabricated rods is as shown in table 1.
The significant parameter of table 1. plug and prefabricated rods
| Sequence number | The plug parameter | Sandwich layer doping F amount (wt%) | Covering doping F amount (wt%) sink | Prefabricated rods external diameter (mm) behind the plasm outward spraying | ||||
| Δ +(％) | Δ -(％) | a(mm) | b/a | c/a | ||||
| 1 | 0.311 | -0.042 | 5.68 | 2.78 | 3.86 | 0.496 | 0.824 | 81.6 |
| 2 | 0.310 | -0.011 | 5.67 | 3.37 | 4.28 | 0.452 | 0.785 | 81.4 |
| 3 | 0.325 | -0.024 | 5.69 | 3.41 | 4.34 | 0.411 | 0.694 | 82.0 |
| 4 | 0.351 | -0.039 | 5.56 | 3.84 | 4.89 | 0.302 | 0.614 | 79.8 |
| 5 | 0.349 | -0.012 | 5.64 | 3.39 | 4.34 | 0.453 | 0.814 | 80.7 |
Embodiment two: the combination mandrel process
With the PCVD prepared is 80 millimeters, 120 millimeters and 150 millimeters plugs that are complementary with external diameter respectively, and the external diameter of used bushing pipe is 31mm, and wall thickness is 2 millimeters.In the plug, the weight percentage of mixing F in sandwich layer and the lower limit covering is for being respectively 0.452% and 0.723%, and the plug significant parameter is as shown in table 2.
The significant parameter of table 2. plug
| Type | Δ +(％) | Δ -(％) | a(mm) | b(mm) | c(mm) | b/a | c/a | The bushing pipe type |
| Φ80mm | 0.324 | -0.015 | 5.63 | 12.80 | 19.8 | 2.27 | 3.52 | F300 |
| Φ120mm | 0.325 | -0.020 | 8.45 | 19.20 | 24.5 | 2.27 | 2.90 | F300 |
| Φ150mm | 0.325 | -0.020 | 10.56 | 23.50 | 28.0 | 2.23 | 2.65 | F500 |
Select for use synthetic high purity quartz pipe as intermediate casing, plug and intermediate casing are behind cleaning-drying, be reduced to together plug and intermediate casing are molten, obtain making up plug, the outer spray of using plasma is sprayed directly into silica powder on the combination plug and makes preform then.The significant parameter of intermediate casing, combination plug and prefabricated rods etc. is as shown in table 3.
The significant parameter of table 3. intermediate casing, combination plug and prefabricated rods
| Sequence number | The plug type | Intermediate casing external diameter (mm) | Intermediate casing internal diameter (mm) | Combination plug external diameter (mm) | Prefabricated rods external diameter (mm) behind the plasm outward spraying |
| 6 | Φ80mm | 40 | 22 | 38.6 | 80.3 |
| 7 | Φ120mm | 60 | 26 | 59.2 | 119.7 |
| 8 | Φ150mm | 80 | 29 | 79.5 | 150.2 |
Embodiment three: assembled casing technology
Using plasma sprays outward silica powder is sprayed directly into and makes assembled casing on the intermediate casing, adopts tiretube process to obtain supplying the stringy prefabricated rods then.The size of plug and intermediate casing and kind are fully with embodiment two.Significant parameter is as shown in table 4.
The significant parameter of table 4. intermediate casing and assembled casing
| Sequence number | The plug type | Intermediate casing | Assembled casing behind the plasm outward spraying | ||
| External diameter (mm) | Internal diameter (mm) | External diameter (mm) | Internal diameter (mm) | ||
| 9 | Φ80mm | 40 | 22 | 80.3 | 21.5 |
| 10 | Φ120mm | 60 | 26 | 120.1 | 25.8 |
| 11 | Φ150mm | 80 | 29 | 150.3 | 28.9 |
In system assembled casing process, intermediate casing is slightly molten to contract with plasm outward spraying, in order to prevent Internal Hole Deformation, when deposition initial stage target rod wall thickness is thin, can feed gas in pipe, makes the pressure of keeping in the pipe about 100pa.Assembled casing technology has been saved collapsar technics for the combination mandrel process, when scrapping because of the generation of plug reason, plug can be taken out, and assembled casing still can use, and weak point is the complicacy that has increased drawing process.
In the above-described embodiments, the result is as shown in table 5 for gained optical fiber, and other parameter all meets the G.652.D requirement of sonet standard.
Table 5. optical fiber result
| Sequence number | Cutoff wavelength (nm) | Attenuation (dB/km) | |||
| 1310nm | 1383nm (the aging back of hydrogen loss) | 1550nm | 1625nm | ||
| 1 | 1205 | 0.325 | 0.320 | 0.196 | 0.216 |
| 2 | 1231 | 0.332 | 0.297 | 0.192 | 0.206 |
| 3 | 1267 | 0.324 | 0.302 | 0.188 | 0.201 |
| 4 | 1252 | 0.334 | 0.326 | 0.196 | 0.204 |
| 5 | 1276 | 0.336 | 0.291 | 0.197 | 0.211 |
| 6 | 1291 | 0.327 | 0.293 | 0.193 | 0.204 |
| 7 | 1273 | 0.330 | 0.287 | 0.186 | 0.199 |
| 8 | 1254 | 0.332 | 0.292 | 0.192 | 0.204 |
| 9 | 1287 | 0.328 | 0.294 | 0.191 | 0.203 |
| 10 | 1268 | 0.329 | 0.294 | 0.189 | 0.202 |
| 11 | 1263 | 0.335 | 0.296 | 0.194 | 0.202 |
Claims (6)
1, a kind of using plasma sprays the method for manufactured preformod of optical fiber with low water peak outward, and the section index distribution of plug adopts the blanket design of sinking:
Δ
-=-0.04--0.01%, Δ
+=0.310-0.350%, b/a 〉=2.3, c/a 〉=3.9, sandwich layer mix fluorine weight percentage=0.30%-0.50%; Sink covering mix fluorine weight percentage=sandwich layer mix fluorine weight percentage+K * (Δ
+-Δ
-), 0.70≤K≤1.04, its concrete steps at first prepare the plug of said structure for (1); (2) the outer spray method of using plasma is deposited on silica powder and prepares surrounding layer on the plug, promptly makes preformod of optical fiber with low water peak.
2, spray the method for manufactured preformod of optical fiber with low water peak outward according to a kind of using plasma of claim 1, wherein: described plug adopts the PCVD prepared.
3, spray the method for manufactured preformod of optical fiber with low water peak outward according to a kind of using plasma of claim 1, its step is as follows: one or more snippets plug of described step (1) preparation is inserted in the intermediate casing, on the stretching tower, with fluorine-containing gas and assist gas mandrel outer surface and intermediate casing internal surface are corroded earlier, with its molten being reduced to together, obtain making up plug then; The outer spray method of using plasma is sprayed directly into silica powder on the combination plug and makes preformod of optical fiber with low water peak then.
4, spray the method for manufactured preformod of optical fiber with low water peak outward according to a kind of using plasma of claim 1, its step is as follows: at first the outer spray method of using plasma is sprayed directly into silica powder and makes assembled casing on the intermediate casing; Adopt tiretube process that the plug insertion assembled casing of described step (1) preparation is made preformod of optical fiber with low water peak then.
5, spray the method for manufactured preformod of optical fiber with low water peak outward according to a kind of using plasma of claim 1, wherein plasm outward spraying method concrete steps are as follows: silica powder feeder sleeve and plasma lamp are fixed on the hot support of retaining, plasma lamp is 45 degree obliquely, its position with respect to the target rod can be adjusted, the silica powder feeder sleeve also can be adjusted with respect to the position of plasma lamp, and silica powder feeder sleeve and plasma lamp alignment targets rod are deposited.
6, spray the method for manufactured preformod of optical fiber with low water peak outward according to a kind of using plasma of claim 1, wherein the tilt angle alpha of silica powder feeder sleeve is 45 degree.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102923942A (en) * | 2012-11-05 | 2013-02-13 | 长飞光纤光缆有限公司 | Method for manufacturing large-diameter optical fiber perform rod |
| CN103864291A (en) * | 2014-01-27 | 2014-06-18 | 长飞光纤光缆股份有限公司 | Single mode fiber preform and preparation method thereof |
| CN108640501A (en) * | 2018-05-03 | 2018-10-12 | 烽火通信科技股份有限公司 | The production method and casing stick of a kind of casing stick for drawing optical fibers |
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| US6131415A (en) * | 1997-06-20 | 2000-10-17 | Lucent Technologies Inc. | Method of making a fiber having low loss at 1385 nm by cladding a VAD preform with a D/d<7.5 |
| US6904772B2 (en) * | 2000-12-22 | 2005-06-14 | Corning Incorporated | Method of making a glass preform for low water peak optical fiber |
| CN1337367A (en) * | 2001-09-08 | 2002-02-27 | 长飞光纤光缆有限公司 | Manufacture of prefabricated fiber rod |
| CN1159242C (en) * | 2001-10-10 | 2004-07-28 | 长飞光纤光缆有限公司 | Process for preparing high-strength antifatigue optical fibre |
| CN1474203A (en) * | 2002-08-07 | 2004-02-11 | 汪业衡 | Dispersion stable low dispersion slope sub-full wave opltical fibre |
| CN1226211C (en) * | 2003-06-27 | 2005-11-09 | 长飞光纤光缆有限公司 | Manufacture of single mode oplical fibers |
| WO2005070843A1 (en) * | 2004-01-20 | 2005-08-04 | Corning Incorporated | Double clad optical fiber with rare earth metal doped glass core |
| CN1301225C (en) * | 2004-05-10 | 2007-02-21 | 烽火通信科技股份有限公司 | Method for producing low water peak fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102923942A (en) * | 2012-11-05 | 2013-02-13 | 长飞光纤光缆有限公司 | Method for manufacturing large-diameter optical fiber perform rod |
| CN102923942B (en) * | 2012-11-05 | 2015-10-14 | 长飞光纤光缆股份有限公司 | The preparation method of large-scale optical fiber prefabricating stick |
| CN103864291A (en) * | 2014-01-27 | 2014-06-18 | 长飞光纤光缆股份有限公司 | Single mode fiber preform and preparation method thereof |
| CN103864291B (en) * | 2014-01-27 | 2016-08-24 | 长飞光纤光缆股份有限公司 | A kind of single-mode fiber prefabricated rods and preparation method thereof |
| CN108640501A (en) * | 2018-05-03 | 2018-10-12 | 烽火通信科技股份有限公司 | The production method and casing stick of a kind of casing stick for drawing optical fibers |
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| CN100406401C (en) | 2008-07-30 |
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