CN105347666A - Manufacturing method of low-loss optical fiber preformed rod - Google Patents
Manufacturing method of low-loss optical fiber preformed rod Download PDFInfo
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- CN105347666A CN105347666A CN201510856327.3A CN201510856327A CN105347666A CN 105347666 A CN105347666 A CN 105347666A CN 201510856327 A CN201510856327 A CN 201510856327A CN 105347666 A CN105347666 A CN 105347666A
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Abstract
The invention relates to a manufacturing method of a low-loss optical fiber preformed rod. The manufacturing method of the low-loss optical fiber preformed rod comprises the steps that 1, a core layer loose body base material is prepared through an axial vapor deposition method; 2, dehydroxylation and vitrification treatment are conducted on the loose body base material in a graphite sintering furnace, and Cl2 and He are fed into the sintering furnace when dehydroxylation is conducted; 3, a glass rod which is subjected to the dehydroxylation and vitrification treatments is extended to appropriate external diameter through a lathe, and the core layer portion of the preformed rod is prepared; 4, a preformed rod cladding loose body base material is prepared on the surface of the core layer through an outside vapor deposition method by taking the core layer as the basis; 5, finally, dehydroxylation and vitrification treatment are conducted on the preformed rod cladding loose body base material, the dehydroxylation process and the vitrification process of the cladding loose body base material are simultaneously conducted in different temperature zones in the sintering furnace, the base material is moved downwards at a speed of 2-5 mm/min to pass through the high temperature zone of the sintering furnace, the dehydroxylation process and the vitrification process are completed after the base material reaches a set length, and the low-loss optical fiber preformed rod is prepared.
Description
Technical field
The manufacture method of a kind of low loss fiber prefabricated rods that what the manufacture method of a kind of low loss fiber of the present invention prefabricated rods related to is.The content of the preform impurity metal ion that the method manufactures is lower, and the decay in Optical Fiber Transmission process is lower.
Background technology
The demand of optical fiber increases year by year in recent years, but the price of optical fiber continues at a low ebb, this causes very large pressure for optical fiber Cheng Chan enterprise, and even will try to achieve existence without the profit epoch in this meagre profit, the optical fiber manufacturing low decay becomes the only way of enterprise development.
Chinese invention patent CN103382085A provides a kind of manufacture method of low loss fiber, and the method key step is as follows: the specific refractory power 1. being determined fibre core by design; 2. carry out the deposition of fibre core by VAD technique, the loosening body deposited is sintered successively, dehydration and vitrifying, then be drawn to predetermined diameter; 3. inner cladding is installed in surrounding layer, seals the end face of one end, then fibre core is installed in inner cladding, fibre core is fixed, namely complete the manufacture of preform; 4. the preform assembled is arranged on wire-drawer-tower, then preform is sent to graphite fiber drawing furnace, heat described graphite fiber drawing furnace, optical fiber is pumped in preform fusing; 5. optical fiber is successively by caliper, cooling tube, coating cup, and UV solidifies, and arrives main towing mechanism, namely completes the manufacture of whole optical fiber.The main slave unit of the method and production aspect are optimized to reduce fibre loss, but for fundamentally solving the decay produced in prefabricated rods manufacturing processed.
Chinese invention patent CN1891649 provides a kind of manufacture method of low loss fiber, the method is a kind of optical fiber of the improvement by the production of mixing VAD/MCVD treating processes, the sandwich layer of optical fiber is produced by VAD method, and inner cladding has the specific refractory power of depression also to produce by MCVD method, the method does not also fundamentally solve the decay that VAD legal system obtains the follow-up deshydroxy of loosening body mother metal and During Vitrification in vitro generation.
In prefabricated rods manufacturing processed, axial vapor deposition method (VAD) widespread use.Its ultimate principle has some blowtorch to generate SiO 2 powder by chemical reaction in an airtight deposition chamber, and the SiO 2 powder of generation rotates at one the suspension rod end risen to be continued to pile up, and finally makes loosening body mother metal.In mother metal manufacturing processed, usually need in mother metal sandwich layer doped with Ge for improving specific refractory power.
The loosening body mother metal obtained by VAD method is again at Cl
2carry out deshydroxy process in atmosphere, deshydroxy phase temperature is generally at 1100 DEG C.After deshydroxy terminates, mother metal carries out vitrifying process again in He atmosphere allows mother metal heat further and vitrifying, thus the sandwich layer part of obtained preform, and glass transition phases temperature is generally at 1500 DEG C.
The inside heating furnace of deshydroxy and vitrifying is equipped with furnace core tube for isolated air, in the middle part of process furnace, heating member is housed, and loosening body mother metal is suspended in process furnace by suspension rod and has moved up and down deshydroxy and During Vitrification in vitro.Above process furnace, seal cover board is housed, cover plate can folding, is convenient to the handling of mother metal.Furnace core tube material generally selects high temperature resistant, high-purity quartz making.In manufacturing processed, furnace core tube is in sealed state, and inside passes into deshydroxy and the During Vitrification in vitro that the gas such as chlorine, helium completes mother metal.
After the middle part heating member work of process furnace, air-flow in process furnace flows from bottom to top, in order to avoid convection current thus heating furnace gas pass into from below, gas barrier is positioned at process furnace top, to make in furnace core tube gas flow be consistent with heating gas stream in the stove.
In traditional technology, the deshydroxy of loosening body precasting bar and During Vitrification in vitro allow loosening body mother metal decline above process furnace, carries out deshydroxy process from the top down with certain speed.After deshydroxy terminates, loosening body mother metal rise to starting position simultaneously process furnace be warming up to second-order transition temperature, after furnace temperature to be sintered reaches second-order transition temperature, mother metal moves forward into oozy glass process again from the top down.Produce the sandwich layer part of prefabricated rods by this method, after extending, outside sandwich layer, manufacture covering by OVD method again, can be made into complete preform thus.
Optical fiber after the preform drawing of preparing by traditional technology, decay in the transmitting procedure of signal larger, the principal element that research shows affect optical fiber attenuation is hydroxyl in optical fiber and metal ion, therefore the decay reducing optical fiber can be carried out from deshydroxy effect two aspect reducing metal ion pollution and raising loosening body mother metal.The present invention, by improving the deshydroxy of loosening body mother metal and vitrifying mode, drastically reduce the area the pollution of metal ion to loosening body mother metal, also ensure that the homogeneity of loosening body mother metal deshydroxy improves deshydroxy effect simultaneously.
Summary of the invention
The object of the invention is the manufacture method that a kind of low loss fiber prefabricated rods is provided for above-mentioned weak point, with axial vapor deposition method (VAD method) obtained loosening body mother metal in deposition chamber, obtained preform core layer segment after deshydroxy and vitrifying process.When loosening body mother metal carries out deshydroxy process in sintering oven, mother metal is mobile from bottom to top carries out deshydroxy process by sintering oven high-temperature zone, and deshydroxy process is carried out in chlorine atmosphere.After furnace temperature to be sintered is warming up to second-order transition temperature, mother metal is again mobile from bottom to top carries out During Vitrification in vitro by sintering oven high-temperature zone.In the present invention, to carry out deshydroxy identical with gas flow direction in process furnace with travel direction during During Vitrification in vitro for mother metal, is all move from bottom to top (as Fig. 1).The present invention can prepare low-loss preform, thus the decay at each wave band of optical fiber after significantly can improving prefabricated stick drawn wire, improve the parameters index of optical fiber.
A kind of manufacture method of low loss fiber prefabricated rods takes following technical scheme to realize:
A kind of manufacture method step of low loss fiber prefabricated rods is as follows:
1. with the obtained sandwich layer loosening body mother metal of axial vapor deposition method (VAD method), after chemical reaction, SiO 2 powder is generated by multiple deposition blowlamp in an airtight quartzy cavity, the SiO 2 powder generated rotates at one the suspension rod end risen to be continued to pile up, the translational speed of suspension rod, generally at 30 ~ 40mm/h, finally makes loosening body mother metal; Deposition blowlamp can arrange 4.
2. in graphite sintering stove, deshydroxy and vitrifying process are carried out to loosening body mother metal, during deshydroxy, in sintering oven, pass into Cl
2and He, gas flow adjusts according to the parameter of prefabricated rods, general Cl
2flow is at 500 ~ 1500mL/min, He flow at 10 ~ 15L/min, and sintering oven deshydroxy temperature is 900 ~ 1200 DEG C; During deshydroxy, mother metal moves from bottom to top, and translational speed is at 5 ~ 10mm/min, and deshydroxy terminates rear mother metal and drops to bottom sintering oven; mother metal moves forward into oozy glass process from bottom to top; translational speed, at 4 ~ 8mm/min, only passes into He in During Vitrification in vitro sintering oven, and vitrification point is 1200 ~ 1500 DEG C.
3. carried out extending to suitable outer diameter by glass stick lathe after deshydroxy and vitrifying process, the sandwich layer part of obtained prefabricated rods, after general extension, sandwich layer external diameter is at 45 ~ 50mm;
4. based on sandwich layer, obtain prefabricated rod cladding loosening body mother metal at its surperficial Outside Vapor Deposition (OVD method), plug two ends after above-mentioned extension are docked respectively rod, after docking, glass stick is placed on rotatable lathe, SiO 2 powder is generated by multiple axially displaceable deposition blowlamp, the SiO 2 powder generated constantly deposits on the glass stick of this rotation grows up, reach after setting weight or setting rotate back to number and stop deposition, obtained prefabricated rod cladding loosening body mother metal; Deposition blowlamp can arrange 4.
5. finally again deshydroxy and vitrifying process are carried out to prefabricated rod cladding loosening body mother metal, deshydroxy and the During Vitrification in vitro of covering loosening body mother metal utilize the different warm area of sintering oven to carry out simultaneously, namely mother metal presses certain speed, generally at the uniform velocity move downwards through sintering oven high-temperature zone at 2 ~ 5mm/min, sintering oven temperature is 1200 ~ 1500 DEG C, passes into Cl in moving process in sintering oven
2and He, general Cl
2flow at 10 ~ 25L/min, namely completes deshydroxy and During Vitrification in vitro after reaching preseting length at 500 ~ 2000mL/min, He flow, makes a kind of low loss fiber prefabricated rods.
In sintering oven, furnace core tube is made with high purity quartz usually, but the metal ion of furnace core tube inside still can evaporate in sintering oven in high temperature environments, and the thermal motion of metal ion is in high temperature environments more frequent, causes mother metal to be more easily contaminated by the metal ions.
In traditional technology, mother metal is that the bottom of the i.e. mother metal of movement from the top down first completes During Vitrification in vitro in During Vitrification in vitro.And to sinter gas stream in the stove be from below to up, therefore cause most of metal ion to be also positioned at the upper area of heating member, the time that mother metal top is in metal ion atmosphere is longer, and this exacerbates mother metal and is contaminated by the metal ions probability.
For the deficiency that above-mentioned technique exists, the invention provides a kind of method that can reduce the contaminated reduction Optical Fiber Transmission decay of mother metal, namely mother metal carrying out During Vitrification in vitro is, mother metal from bottom to top movement passes through heating zone, owing to completing During Vitrification in vitro by mother metal during heating member upper metal ion aggregation district, therefore mother metal can not be contaminated by the metal ions.In addition, owing to constantly there being clean air-flow to flow from bottom to top below furnace core tube, the metal ion on heating member top can not flow downward, and the not vitrified loosening body part in mother metal bottom is also difficult to be contaminated by the metal ions.
On the other hand, if mother metal deshydroxy process moves from the top down, and During Vitrification in vitro moves from bottom to top, then can cause vitrifying after the first deshydroxy in the bottom of mother metal, and the first vitrifying of deshydroxy behind the top of mother metal, this can cause mother metal different positions deshydroxy to differ more with vitrified interval time.And loosening body mother metal is after deshydroxy terminates, play loosening body inside and still has more chlorine molecule, and mother metal deshydroxy terminates rear sintering oven and namely starts to be warming up to second-order transition temperature, and mother metal top and the bottom deshydroxy effect can be caused to there are differences (as Fig. 3).On the other hand, mother metal top and the bottom deshydroxy is uneven also can cause the distribution of mother metal sandwich layer Ge to change, and this can affect the distributing homogeneity of precast rod refractivity.Therefore consider, during mother metal deshydroxy, travel direction also needs more vitrifying travel direction to be consistent, and namely movement from bottom to top completes deshydroxy process.
A kind of manufacture method of low loss fiber prefabricated rods is reasonable in design, and optical fiber prepared by the method is lower due to the content of metal ion, considerably reduces the loss of each wave band of optical fiber, thus has possessed low-loss good characteristic.Optical fiber prepared by the method, effectively can reduce the loss of fiber-optic signal in transmitting procedure, significantly can reduce the number of relay station, increase the distance between each relay station simultaneously, thus significantly reduce the use cost of optical fiber.
Accompanying drawing explanation
Below with reference to accompanying drawing, the invention will be further described:
Fig. 1 is a kind of schematic diagram of manufacture method travel direction of low loss fiber prefabricated rods.
Fig. 2 is the schematic diagram of the manufacture method travel direction of ordinary optic fibre prefabricated rods.
Fig. 3 is the deshydroxy prefabricated rods attenuation distribution schematic diagram that manufactures contrary to vitrifying travel direction.
Fig. 4 is 1310 attenuation distribution contrast schematic diagram of embodiment 1 and embodiment 2.
Fig. 5 is 1383 attenuation distribution contrast schematic diagram of embodiment 1 and embodiment 3.
Embodiment
With reference to accompanying drawing 1 ~ 5, elaborated by the manufacture method of embodiment to a kind of low loss fiber prefabricated rods.
A kind of concrete manufacture method of low loss fiber prefabricated rods is as follows:
1. make prefabricated rods sandwich layer loosening body mother metal by VAD legal system.
2. loosening body mother metal is hung by suspension rod and drops to bottom furnace core tube, now passes into Cl in furnace core tube
2and He, sintering oven deshydroxy temperature is generally at 900 ~ 1200 DEG C, and mother metal carries out deshydroxy process (as Fig. 1) so that the speed of 8-10mm/min is mobile from bottom to top by heating furnace high-temperature district.After deshydroxy terminates, mother metal drops to bottom furnace core tube again, now only passes into He in furnace core tube, and second-order transition temperature is generally at 1200 ~ 1500 DEG C, and mother metal carries out vitrifying process so that the speed of 6 ~ 8mm/min is mobile from bottom to top by heating furnace high-temperature district again.
3. the mother metal after vitrifying can be the sandwich layer part of prefabricated rods, its by extension apparatus in the downward sandwich layer part being stretched into prefabricated rods of oxyhydrogen flame calcination.
4. make the covering loosening body part of prefabricated rods in the outside OVD method of sandwich layer, covering loosening body can obtain complete preform after deshydroxy and vitrifying process.
Traditional prefabricated rods making method, owing to being the metal ion pollution be sintered in stove at manufacture sandwich layer, obtained optical fiber attenuation is higher, and due to metal ion thermal motion irregular therefore the Optical Fiber Transmission homogeneity of different positions is also poor.And adopt the present invention to obtain prefabricated rods due to sandwich layer part not to be contaminated by the metal ions, therefore the obtained attenuation pole of optical fiber in transmitting procedure is low, and also there is clear superiority in homogeneity.
Embodiment 1
To obtain loosening body mother metal by VAD legal system in sintering oven drops to bottom furnace core tube by suspension rod suspension, pass in the ratio of 1:9 in chlorine and helium in furnace core tube, sintering oven deshydroxy temperature is 1100 DEG C, mother metal with 10mm/min speed from bottom to top mobile by heating furnace high-temperature district carry out deshydroxy process as (a) and (b), (c) in Fig. 1 sequentially.Deshydroxy terminates rear mother metal and is reduced to starting position, only pass into helium in furnace core tube and carry out vitrifying process, mother metal moves from bottom to top with 8mm/min speed, and sintering oven second-order transition temperature is 1500 DEG C, and mother metal is mobile from bottom to top carries out vitrifying process by heating furnace high-temperature district.
Aforesaid method obtains the sandwich layer part of prefabricated rods, then by extension apparatus in the downward sandwich layer part being stretched into prefabricated rods of oxyhydrogen flame calcination.Make the covering loosening body of prefabricated rods in the outside OVD method of sandwich layer, covering loosening body can obtain complete preform after deshydroxy and vitrifying process.Be analyzed with this method continuous seepage 100 preforms.
The decay of optical fiber in transmitting procedure of the prefabricated stick drawn wire of this method is lower, decays to 0.32dB/km at 1310nm wave band.100 prefabricated rods are manufactured, the decay after each prefabricated stick drawn wire all lower (as Fig. 4) by the method.
Embodiment 2
Identical with embodiment, to obtain loosening body mother metal by VAD legal system in sintering oven drops to bottom furnace core tube by suspension rod suspension, pass in the ratio of 1:9 in chlorine and helium in furnace core tube, sintering oven deshydroxy temperature is 1100 DEG C, and mother metal carries out deshydroxy process so that 10mm/min speed is mobile from bottom to top by heating furnace high-temperature district.After deshydroxy terminates, only pass into helium in furnace core tube and carry out vitrifying process, sintering oven second-order transition temperature is 1500 DEG C, and mother metal carries out vitrifying process (as Fig. 2) so that 8mm/min speed is mobile from the top down by heating furnace high-temperature district.After making preform core layer segment, make the covering loosening body of prefabricated rods in the outside OVD method of sandwich layer, then obtain prefabricated rods through deshydroxy and During Vitrification in vitro.Be analyzed with this method continuous seepage 100 preforms.
There is certain fluctuation in the decay of 1310nm in the optical fiber that the method obtains, fluctuation range is at 0.32 ~ 0.36dB/km.The attenuation distribution of this type of prefabricated rods has certain regularity, and the decay of corresponding sandwich layer mother metal upper position is higher, the decay lower (as Fig. 4) of corresponding sandwich layer mother metal lower position.
Embodiment 3
Identical with embodiment, loosening body mother metal will be obtained by VAD legal system in sintering oven, pass in the ratio of 1:9 in chlorine and helium in furnace core tube, sintering oven deshydroxy temperature is 1100 DEG C, and mother metal carries out deshydroxy process so that 10mm/min speed is mobile from the top down by heating furnace high-temperature district.After deshydroxy terminates, only pass into helium in furnace core tube and carry out vitrifying process, sintering oven second-order transition temperature is 1500 DEG C, and mother metal carries out vitrifying process so that 8mm/min speed is mobile from bottom to top by heating furnace high-temperature district.After making preform core layer segment, make the covering loosening body of prefabricated rods in the outside OVD method of sandwich layer, then obtain prefabricated rods through deshydroxy and During Vitrification in vitro.Be analyzed with this method continuous seepage 100 preforms.
Comparatively ordinary optic fibre is higher in specific refractory power for the optical fiber that the method obtains, and causes the decay of corresponding mother metal upper position 1383 also comparatively large (as Fig. 5) in addition because sandwich layer mother metal top deshydroxy is insufficient.
Claims (2)
1. a manufacture method for low loss fiber prefabricated rods, is characterized in that: step is as follows:
(1) sandwich layer loosening body mother metal is obtained by axial vapor deposition legal system, after chemical reaction, SiO 2 powder is generated by multiple deposition blowlamp in an airtight quartzy cavity, the SiO 2 powder generated rotates at one the suspension rod end risen to be continued to pile up, the translational speed of suspension rod, generally at 30 ~ 40mm/h, finally makes loosening body mother metal;
(2) in graphite sintering stove, deshydroxy and vitrifying process are carried out to loosening body mother metal, during deshydroxy, in sintering oven, pass into Cl
2and He, gas flow adjusts according to the parameter of prefabricated rods, Cl
2flow is at 500 ~ 1500mL/min, He flow is at 10 ~ 15L/min, during deshydroxy, mother metal moves from bottom to top, translational speed is at 5 ~ 10mm/min, and sintering oven deshydroxy temperature is 900 ~ 1200 DEG C, and deshydroxy terminates rear mother metal and drops to bottom sintering oven, mother metal moves forward into oozy glass process from bottom to top, translational speed, at 4 ~ 8mm/min, only passes into He in During Vitrification in vitro sintering oven, and vitrification point is 1200 ~ 1500 DEG C;
(3) carried out extending to suitable outer diameter by glass stick lathe after deshydroxy and vitrifying process, the sandwich layer part of obtained prefabricated rods, after extending, sandwich layer external diameter is at 45 ~ 50mm;
(4) based on sandwich layer, prefabricated rod cladding loosening body mother metal is obtained at its surface Outside Vapor Deposition, plug two ends after above-mentioned extension are docked respectively rod, after docking, glass stick is placed on rotatable lathe, SiO 2 powder is generated by multiple axially displaceable deposition blowlamp, the SiO 2 powder generated constantly deposits on the glass stick of this rotation grows up, reach after setting weight or setting rotate back to number and stop deposition, obtained prefabricated rod cladding loosening body mother metal;
(5) finally again deshydroxy and vitrifying process are carried out to prefabricated rod cladding loosening body mother metal, deshydroxy and the During Vitrification in vitro of covering loosening body mother metal utilize the different warm area of sintering oven to carry out simultaneously, namely mother metal presses certain speed, sintering oven high-temperature zone is at the uniform velocity moved downwards through at 2 ~ 5mm/min, sintering oven temperature is 1200 ~ 1500 DEG C, passes into Cl in moving process in sintering oven
2and He, Cl
2flow at 10 ~ 25L/min, after completing deshydroxy and During Vitrification in vitro, makes low loss fiber prefabricated rods at 500 ~ 2000mL/min, He flow.
2. the manufacture method of a kind of low loss fiber prefabricated rods according to claim 1, it is characterized in that: mother metal is that heating zone is passed through in mother metal movement from bottom to top carrying out During Vitrification in vitro, owing to completing During Vitrification in vitro by mother metal during heating member upper metal ion aggregation district, therefore mother metal can not be contaminated by the metal ions; Owing to constantly there being clean air-flow to flow from bottom to top below furnace core tube, the metal ion on heating member top can not flow downward, and the not vitrified loosening body part in mother metal bottom is also difficult to be contaminated by the metal ions.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082558A (en) * | 2017-04-27 | 2017-08-22 | 烽火通信科技股份有限公司 | Method for manufacturing the preform of single-mode fiber and manufacturing single-mode fiber |
| CN109081575A (en) * | 2017-06-14 | 2018-12-25 | 中天科技精密材料有限公司 | Preform and its manufacturing method |
| CN109942182A (en) * | 2019-03-11 | 2019-06-28 | 江苏永鼎股份有限公司 | A kind of optical fiber preform producing based on tiretube process |
| CN110590151A (en) * | 2019-09-29 | 2019-12-20 | 成都富通光通信技术有限公司 | Optical fiber preform production process and optical fiber preform thereof |
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| CN101426742A (en) * | 2006-04-18 | 2009-05-06 | 信越化学工业株式会社 | Fabrication method for low loss optical fiber preform |
| CN103663958A (en) * | 2013-09-24 | 2014-03-26 | 江苏通鼎光电股份有限公司 | Method for preparing low water peak optical fiber preform |
| CN104556669A (en) * | 2014-12-26 | 2015-04-29 | 中天科技精密材料有限公司 | Control method and device for large diameter preform dehydroxylation and vitrification |
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| CN101426742A (en) * | 2006-04-18 | 2009-05-06 | 信越化学工业株式会社 | Fabrication method for low loss optical fiber preform |
| CN103663958A (en) * | 2013-09-24 | 2014-03-26 | 江苏通鼎光电股份有限公司 | Method for preparing low water peak optical fiber preform |
| CN104556669A (en) * | 2014-12-26 | 2015-04-29 | 中天科技精密材料有限公司 | Control method and device for large diameter preform dehydroxylation and vitrification |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082558A (en) * | 2017-04-27 | 2017-08-22 | 烽火通信科技股份有限公司 | Method for manufacturing the preform of single-mode fiber and manufacturing single-mode fiber |
| CN109081575A (en) * | 2017-06-14 | 2018-12-25 | 中天科技精密材料有限公司 | Preform and its manufacturing method |
| CN109942182A (en) * | 2019-03-11 | 2019-06-28 | 江苏永鼎股份有限公司 | A kind of optical fiber preform producing based on tiretube process |
| CN110590151A (en) * | 2019-09-29 | 2019-12-20 | 成都富通光通信技术有限公司 | Optical fiber preform production process and optical fiber preform thereof |
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Application publication date: 20160224 |