CN103864291B - A kind of single-mode fiber prefabricated rods and preparation method thereof - Google Patents
A kind of single-mode fiber prefabricated rods and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of single-mode fiber prefabricated rods and preparation method thereof.Including single-mode fiber plug and surrounding layer, it is characterized in that described surrounding layer uses APVD technique to be prepared from natural siliceous sand for raw material, in described surrounding layer, the content of metal impurities is less than or equal to 20ppm, wherein aluminum content is less than or equal to 15ppm, alkali metal content is less than or equal to 1ppm, described diameter of mandrel and plug sandwich layer diameter ratio are more than or equal to 3.6, the diameter of preform or equivalent diameter are 100 200mm, and the ratio of the diameter of preform or equivalent diameter and diameter of mandrel is 2.5 4.4.The present invention utilizes natural siliceous sand material with low cost as the outsourcing layer of preform, effectively reduces the manufacturing cost of preform；By controlling the concentration of metal impurities in natural siliceous sand material, fibre-optical mandrel reasonable in design and the diameter ratio of prefabricated rods, effectively reduce the outsourcing layer impact on optical fiber attenuation performance；The optical fiber of the present invention is on the basis of comprehensive compatibility G.652 standard, and fade performance is better than routine G.652 optical fiber.
Description
Technical field
The present invention relates to optical communication field, be specifically related to a kind of single-mode fiber prefabricated rods for optic communication transmission system
And preparation method thereof.
Background technology
Along with the fierceness day by day of Optical Fiber Market competition, the market price of optical fiber becomes the competition hands of increasing manufacturer
Section.Improving the overall efficiency of manufacturing process, the manufacturing cost reducing optical fiber is more and more concerned.Increase the size of prefabricated rods, prolong
The wire drawing time of long single prefabricated rods, improving utilization rate of equipment and installations is the effective means improving and producing overall efficiency.At present, respectively
Individual fiber manufacturing commercial city is at the length of string of the optical fiber increased to greatest extent corresponding to simple optical fiber prefabricated rods.Due in optical fiber
The glass forming clad section occupies overwhelming majority ratio, and the manufacturing cost therefore reducing clad material is that a kind of optical fiber that reduces becomes
This effective means.Synthetic quartz material and natural siliceous sand is mainly had for manufacturing the quartz raw material of preform surrounding layer
Material.The former objectionable impurities content is low, and purity is high, but cost is the highest；The latter's impurity content is higher, but industrialization yield is big, cost
Cheap.China has about 3,800,000,000 tons of high grade quartz ore resources, has the resources advantage developing ultra-pure quartz material.
The covering of optical fiber manufactures means at present mainly two kinds: the outer Directly depositing of plug pipe and tiretube process.
(1) manage outer Direct precipitation and be divided into " outer+Soot method of pipe " and the direct cladding process of APVD.Outer+Soot the epiboly of pipe is
It is considered to manufacture the process route that the large scale prefabricated rod of low cost is first-selected, such as patent US005917109A by industry at present.Especially with
VAD and the OVD technology development to many groups of many modulated structures concussion depositing operation, the direct epiboly of Soot significantly reduces predispersed fiber
The manufacturing cost of system rod.Owing to outside vapor deposition VAD and OVD feature are that sedimentation rate is high, raw material is readily available, at present
The outer outer packet technology of+Soot method of pipe provides most commercial prefabricated rods.But for the preparation large scale prefabricated rod of low water peak, pipe
Outward the technology path of the direct epiboly of+Soot there is also deficiency: a. manage outer method exist Soot preparation and vitrified separation process,
Process is complex；B. it is co-doped with the aspects such as technique with Ge/F relative to manage interior method the most not enough realizing complex index of refraction section.This
Outward, SiCl is used due to Soot technique4Quartz ampoule is obtained, due to SiCl for deposits materials4Vapour deposition process can produce strong corrosion
Property and poisonous gas chlorine and hydrogen chloride, purified treatment is of a high price, and the SiCl4 having neither part nor lot in reaction is difficult to reclaim, and once enters
Entering environment and will produce baneful influence, contaminated ground can become barren land.With SiCl4For deposits materials quartz glass, meeting exists
Silica glass material introduces Si-Cl key, destroys original Si-O spacial framework, cause Si-O atom chain break,
Macroscopically show as reducing viscosity and the mechanical strength of optical fiber of quartz melt so that fibercuts probability increases.Another kind of
Method is APVD coating directly, at high temperature directly completes to be coated with on plug by plasma heating natural siliceous sand
Journey, owing to APVD uses raw material to be natural siliceous sand powder, directly takes from natural quartz ore deposit, it is not necessary to carry out at chemosynthesis
Reason, does not has any by-product, not only has some superiority on cost but also avoid the destruction to environment.The quartz that APVD sprays
Sand powder is directly to form glass on target, and not only deposition velocity is fast, and eliminates soot technique and forming quartz soot
It is sintered vitrified step the most again, more simple in technique.But, owing to the purity of natural siliceous sand has necessarily
Limit, there are more metal impurities, be at high temperature easy to spread to sandwich layer.It is therefore desirable to there is rational synthetic quartz covering
Thickness stops the OH base in sub-contract management and the diffusion of other impurity.
Such as moral Racal company, for solving this problem, successively uses two kinds of different methods to realize.Wherein: patent
CN200410101230.3 introduces the synthetic silica bag of a kind of mandrel surface one layer of fluorine doped of deposition manufactured in CVD technique
Layer, then the silicon dioxide covering in fluorine doped is outer with APVD process deposits natural siliceous sand surrounding layer.This method requires deposition
Preform diameter after fluorine doped silicon dioxide covering is more than more than 5 times of sandwich layer diameter, and the fluorine doped silica quartz synthesized
Sand cost is far above natural siliceous sand.The most this method weakens APVD technique advantage on cost to a certain extent.
(2) tiretube process is to shorten solid bar or directly wire drawing into by melting after the plug each prepared and sleeve-assembled again.
This method manufactures respectively due to covering and plug, and therefore plug is possible not only to OVD, the VAD technique system selecting deposition velocity fast
Standby, and deposition velocity can be used slow but refractive index profile controls fine CVD(and includes PCVD, MCVD, FCVD etc.) technique
Preparing, sleeve pipe then can select OVD, and prepared by the technique of the fast deposition such as VAD, taken into account the refractive index profile of sandwich layer simultaneously
Control and the control of covering cost.Prepare respectively additionally, due to plug and covering, the most without interruption, even if clad material
In have a small amount of impurity, in covering deposition process, be in the condition of high temperature for a long time owing to eliminating plug, impurity diffusion several
Rate also can reduce.Therefore, tiretube process is combined with APVD technique, use APVD technique to manufacture with natural siliceous sand for raw material
Optical fiber covering sleeve pipe, is a kind of effective means reducing optical fiber cost.
Initial natural high purity quartz material is to be processed by I and II crystal, along with I and II Crystal Resances by
Step exhaustion, from the seventies in last century, developed country starts exploration and replaces crystal to prepare quartz material with common quartz.China is from 20
Begin one's study the end of the eighties in century the common quartz raw material of quartz glass, has been achieved with necessarily being in progress, and studied product can reach
To two, three, the level of level Four crystal, but in being suitable only for, low-grade quartz glass, the technology of hydroxyl quartz raw material high-purity, low
Difficulty is the biggest.
And the metals content impurity included in natural quartz, especially alkali metal concn are of a relatively high, if directly
Using natural siliceous sand material as the clad material of preform, higher metals content impurity can cause optical fiber attenuation anxious
Sharp increase adds.If the impurity content in price reduction natural siliceous sand, other are used merely either physically or chemically to withdraw deposit, again
The raising material cost that meeting is covert.So how confirm the impurity concentration threshold value to optical fiber attenuation in natural siliceous sand, and pass through
Related process design reduces the specific impurities impact on optical fiber attenuation in natural siliceous sand, becomes a challenge the most urgent.
Introduce summary of the invention for convenience, definitional part term:
PPM: be millionth weight ratio for content；
RIC technique: Rod In Cylinder；
Equivalent diameter: as preform is to use RIC technique to assemble, by plug and big sleeve pipe
(Cylinder) cross-sectional area is added, when being then convert into the solid preform that iso-cross-section amasss, and the diameter of solid preform.
Refractive index profile: the relation between optical fiber or preform (including plug) glass refraction and its radius；
Relative index of refraction: Δ ni=(ni-n0)/n0, niAnd n0It is respectively each corresponding optical fiber each several part and surrounding layer quartz material
The refractive index of material.The refractive index of surrounding layer quartz material of the present invention is the refractive index of high-purity synthetic quartz sand material, about
It is 1.45740.
The contribution amount of fluorine (F): fluorine doped (F) quartz glass is exhausted relative to the refractive index difference of high-purity natural quartz sand material
To value, i.e. Δ Fi=| nFi-n0|/n0, represent that fluorine doped (F) is measured with this.
Summary of the invention
The technical problem to be solved is to utilize natural siliceous sand material with low cost as optical fiber prefabricating
The outsourcing layer of rod, by optimizing technological design, it is provided that a kind of can be used for telecommunication transmission system there is relatively low manufacturing cost
Single-mode fiber prefabricated rods.
The present invention solves that the technical scheme that problem set forth above is used is: include single-mode fiber plug and outsourcing
Layer, it is characterised in that described surrounding layer uses APVD technique to be prepared from natural siliceous sand for raw material, described surrounding layer
The content of middle metal impurities be less than or equal to 20ppm, wherein aluminum content be less than or equal to 15ppm, alkali metal content less than or etc.
In 1ppm, described diameter of mandrel and plug sandwich layer diameter ratio are more than or equal to 3.6, and diameter or the equivalence of preform are straight
Footpath is 100-200mm, and the ratio of the diameter of preform or equivalent diameter and diameter of mandrel is 2.5-4.4.
By such scheme, described metals content impurity is less than or equal to 15ppm, and aluminum content is less than or equal to 10ppm, alkali
Tenor content is less than or equal to 0.5ppm.
By such scheme, described metal impurities include aluminum, ferrum, calcium, magnesium, titanium, lithium, sodium, potassium etc., described alkali metal bag
Include lithium, sodium, potassium.
By such scheme, described diameter of mandrel and plug sandwich layer diameter ratio are 3.8-4.8；The diameter of preform
Or the ratio of equivalent diameter and diameter of mandrel is 2.8-3.8.
By such scheme, between sandwich layer and surrounding layer, it is coated with the first inner cladding and the second inner cladding, described successively
Two coverings
Mixed with a certain amount of fluorine, the contribution amount Δ F of fluorine3It is 0.7 × 10-3~2.2×10-3, preferably 1.0 × 10-3~1.8
×10-3。
By such scheme, described plug uses OVD, VAD or PCVD technique to be prepared, and in mandrel material, OH content is little
In or equal to 0.05ppm.
By such scheme, the described glass layer material between plug sandwich layer and natural siliceous sand surrounding layer is comprised
Cl ion concentration less than or equal to 3500ppm, preferred version is less than or equal to 2000ppm.To reduce Cl and natural quartz
What the alkali metal in sand caused after combining is separated.
By such scheme, described surrounding layer includes that the natural siliceous sand raw material of 2 layers or more than 2 layers is constituted, near plug
Part is higher in the purity of internal layer, and its metals content impurity is less than or equal to 15ppm, and aluminum content is less than or equal to 10ppm, alkali gold
Belong to Content less than or equal to 0.5ppm, purity higher at internal layer equivalent diameter in prefabricated rods more than or equal to optical fiber
1.5 times of diameter of mandrel.
By such scheme, the optical fiber that described preform prepares attenuation quotient at 1383nm wavelength less than or
Equal to 0.34dB/km, under optimum condition, less than or equal to 0.315dB/km；Attenuation quotient at 1310nm wavelength less than or
Equal to 0.34dB/km, under optimum condition, less than or equal to 0.325dB/km；Attenuation quotient at 1550nm wavelength less than or
Equal to 0.22dB/km, under optimum condition, less than or equal to 0.190dB/km.
By such scheme, the optical fiber that described preform prepares the mode field diameter of 1310nm wavelength be 8.6 ~
9.5μm；The cable cut-off wavelength of optical fiber is less than or equal to 1260nm.
The preparation method of preform of the present invention is: use RIC (ROD In Cylinder) technique to be prepared: will
One or more snippets plug prepared by OVD, VAD or PCVD technique, uses APVD technique to prepare with natural siliceous sand for raw material
The big sleeve pipe of hollow (Cylinder) assemble, big inside pipe casing will be inserted into prepare preform by plug；Institute
The big sleeve pipe one side of something wall thickness stated is more than or equal to 28mm, and the gap between plug and big sleeve pipe is less than or equal to 3mm.
The another kind of preparation method of preform of the present invention is: uses and prepares plug in OVD, VAD or PCVD technique,
Directly use outside APVD technique on plug and spray natural siliceous sand, thus directly prepare solid core fibres prefabricated rods, sink at APVD
Long-pending starting stage sedimentation rate is less than or equal to 20g/min, when the preform diameter of APVD deposition is straight more than or equal to plug
After 2 times of footpath, step up deposition efficiency.This technique manufacturing method is characterised by: for avoiding outer spray on plug
Time natural quartz glass material and plug glass material due to before and after the difference of material component and outer spray variations in temperature difference lead
Cause interfacial stress, cause crackle to burst.
The beneficial effects of the present invention is: outside 1, utilizing natural siliceous sand material with low cost as preform
Clad material, effectively reduces the manufacturing cost of preform；2, by the one hand controlling metal in natural siliceous sand material
The concentration of impurity, reduce natural quartz material surrounding layer alkali metal impurity with cause after Cl ions binding be separated optical fiber is declined
The impact subtracted, fibre-optical mandrel that the opposing party is reasonable in design and the diameter ratio of prefabricated rods, conservative control inner cladding thickness, effectively drop
The impact on optical fiber attenuation performance of the low outsourcing layer；3, deeper Fluorin doped is used in the part that covering is outer.High concentration
Fluorine can be with the hydroxyl reaction in impurity, it is achieved the purpose of " dehydration ", therefore, it is possible to more effectively reduce the water peak of optical fiber；4、
The optical fiber of the present invention is on the basis of comprehensive compatibility G.652 standard, and fade performance is better than routine G.652 optical fiber.It is that one has
The low water peak single mode fiber of relatively low attenuation, it is possible to obtain longer non-relay distance and bigger system redundancy amount, thus optimize
System structure, reduces construction and the operation cost of relay station.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of one embodiment of the invention.
Detailed description of the invention
Describe the present invention below in conjunction with specific embodiment.
Embodiment 1
Prefabricated rods described in embodiment 1 includes main two parts: fibre-optical mandrel prepared by PCVD method and APVD side
The big sleeve pipe of hollow natural siliceous sand material prepared by method, fibre-optical mandrel and big sleeve pipe use ROD IN Cylinder method to enter
Row assembles.
The plug of preform includes core layer, the first inner cladding, the second inner cladding composition.Fiber cores prepared by PCVD
Layer is made up of the quartz glass mixed with fluorine with germanium: have three coverings outside core layer.First inner cladding closely surrounds core layer, with fibre
Sandwich layer is all PCVD sedimentation and prepares；Second inner cladding is made up of the OVD quartz glass of fluorine doped；Triple clad is surrounding layer, tightly
Close all layerings around the second inner cladding.
Big sleeve pipe prepared by APVD technique uses four kinds of different grades of natural siliceous sands to be prepared by raw material, and numbering is with concrete
Impurity content is as shown in table 1.
Table 1 APVD prepares the raw material impurity content analysis of the big sleeve pipe of hollow
Table 2 is 6 kinds of different sizes and become the preform parameter being grouped into；Table 3 is for obtaining with corresponding prefabricated stick drawn wire
Optical fiber canonical parameter, i.e. No. 1 prefabricated rods in the corresponding table 2 of optical fiber 1.
The parameter of table 2 each ingredient of preform
* the raw material grade of No. 6 prefabricated rods uses exceedes the impurity content of regulation in application claims
The parameter of optical fiber after the different prefabricated stick drawn wire of table 3
Embodiment 2
Preform described in embodiment 2 includes two parts: the fibre-optical mandrel prepared by PCVD method, then
Use different brackets natural siliceous sand material, form body with APVD method outer prefabricated rods that is sprayed on plug, more externally spray
After prefabricated rods formed body carry out vitrification process, after process, prefabricated rods surface is carried out machining, makes prefabricated rods surface light
Sliding, prefabricated rods geometric parameter is uniform.
Table 4 is the natural siliceous sand impurity content used in the present embodiment.
Table 4 APVD prepares the raw material impurity content analysis of the big sleeve pipe of hollow
Table 5 is 2 kinds of different sizes and become the preform parameter being grouped into.
The parameter of table 5 each ingredient of preform
Table 6 is No. 1 prefabricated rods in the corresponding table 6 of the optical fiber canonical parameter obtained with corresponding prefabricated stick drawn wire, i.e. optical fiber 1.
The parameter of optical fiber after the different prefabricated stick drawn wire of table 6
Embodiment 3
Prefabricated rods described in embodiment 3 includes two parts: fibre-optical mandrel prepared by PCVD method and APVD method system
The big sleeve pipe of standby hollow natural siliceous sand material, fibre-optical mandrel and big sleeve pipe use Rod In Cylinder method to carry out group
Dress up preform.
The plug of preform includes core layer, the first inner cladding, the second inner cladding and composition.Optical fiber prepared by PCVD
Sandwich layer is made up of the quartz glass mixed with fluorine and germanium and other adulterants: have three coverings outside core layer.First inner cladding is tight
Around core layer, it is all PCVD sedimentation with core layer and prepares；Second inner cladding is made up of the OVD quartz glass of fluorine doped；3rd
Covering is surrounding layer, closely surrounds all layerings of the second inner cladding.
It is still employing APVD technique as the big sleeve pipe of preform outsourcing layer to prepare, different from embodiment 1
It is that big sleeve pipe in the present embodiment is that to use 2 kinds of different grades of natural siliceous sands be that raw material is prepared stepped depositions and formed, i.e.
First using with high-grade, the glass sand material of low impurity content deposits the internal layer of big sleeve pipe, is then using lower cost
, high impurity content, inferior grade quartz sand deposits the outer layer of big sleeve pipe.So because the partial impurities of the plug of close optical fiber contains
Measure relatively low, do not interfere with optical fiber attenuation, and outside inferior grade, the quartz sand sedimentary body of low cost reduces preform
Cost.Quartz sand numbering and concrete impurity content that the present embodiment uses are as shown in table 7.
Table 7 APVD prepares the raw material impurity content analysis of the big sleeve pipe of hollow
Table 8 is 4 kinds of different sizes and become the preform parameter being grouped into.
The parameter of table 8 each ingredient of preform
Table 9 is No. 1 prefabricated rods in the corresponding table 8 of the optical fiber canonical parameter obtained with corresponding prefabricated stick drawn wire, i.e. optical fiber 1.
The parameter of optical fiber after the different prefabricated stick drawn wire of table 9
Claims (9)
1. a single-mode fiber prefabricated rods, including single-mode fiber plug and surrounding layer, it is characterised in that described surrounding layer is with sky
So quartz sand is that raw material uses APVD technique to be prepared from, and in described surrounding layer, the content of metal impurities is less than or equal to
20ppm, wherein aluminum content is less than or equal to 15ppm, and alkali metal content is less than or equal to 1ppm, described diameter of mandrel and plug
Sandwich layer diameter ratio is more than or equal to 3.6, and the diameter of preform or equivalent diameter are 100-200mm, preform
The ratio of diameter or equivalent diameter and diameter of mandrel is 2.5-4.4；The first inner cladding it is coated with successively between sandwich layer and surrounding layer
With the second inner cladding, the second described inner cladding is mixed with a certain amount of fluorine, the contribution amount Δ F of fluorine3It is 0.7 × 10-3~2.2×10-3, the contribution amount of described fluorine is the fluoro-alloyed quartz glass absolute value relative to the refractive index difference of high-purity natural quartz sand material；
Described surrounding layer include 2 layers or more than 2 layers natural siliceous sand raw material constitute, near mandrel segment internal layer purity relatively
Height, its metals content impurity is less than or equal to 15ppm, and aluminum content is less than or equal to 10ppm, and alkali metal content is less than or equal to
0.5ppm, purity higher at internal layer equivalent diameter in prefabricated rods more than or equal to 1.5 times of fibre-optical mandrel diameter.
2. the described single-mode fiber prefabricated rods as described in claim 1, it is characterised in that metal impurities in described surrounding layer
Content is less than or equal to 15ppm, and aluminum content is less than or equal to 10ppm, and alkali metal content is less than or equal to 0.5ppm.
3. the described single-mode fiber prefabricated rods as described in claim 1 or 2, it is characterised in that in described surrounding layer, metal is miscellaneous
Matter includes that aluminum, ferrum, calcium, magnesium, titanium, lithium, sodium, potassium, described alkali metal include lithium, sodium, potassium.
4. the described single-mode fiber prefabricated rods as described in claim 1 or 2, it is characterised in that described diameter of mandrel and plug
Sandwich layer diameter ratio is 3.8-4.8；The ratio of the diameter of preform or equivalent diameter and diameter of mandrel is 2.8-3.8.
5. the described single-mode fiber prefabricated rods as described in claim 1 or 2, it is characterised in that the second described inner cladding fluorine
Contribution amount Δ F3It is 1.0 × 10-3~1.8×10-3。
6. the described single-mode fiber prefabricated rods as described in claim 1 or 2, it is characterised in that described plug use OVD,
VAD or PCVD technique is prepared, and in mandrel material, OH content is less than or equal to 0.05ppm.
7. the described single-mode fiber prefabricated rods as described in claim 1 or 2, it is characterised in that be positioned at plug sandwich layer and natural stone
The Cl ion concentration that glass layer material between sand surrounding layer is comprised is less than or equal to 3500ppm.
8. the preparation method of the single-mode fiber prefabricated rods as described in claim 1, it is characterised in that use RIC technique to carry out
Preparation: the plug one or more snippets prepared by OVD, VAD or PCVD technique, uses APVD work with natural siliceous sand for raw material
The big sleeve pipe of hollow prepared by skill assembles, and will be inserted into big inside pipe casing and prepare preform by plug；Described
Big sleeve pipe one side of something wall thickness is more than or equal to 28mm, and the gap between plug and big sleeve pipe is less than or equal to 3mm.
9. the preparation method of the single-mode fiber prefabricated rods as described in claim 1, it is characterised in that use at OVD, VAD or
PCVD technique prepares plug, directly uses outside APVD technique and sprays natural siliceous sand, thus directly prepare solid on plug
Preform, the starting stage sedimentation rate in APVD deposition is less than or equal to 20g/min, when the prefabricated rods of APVD deposition is straight
Footpath, more than or equal to after diameter of mandrel 2 times, steps up deposition efficiency.
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| CN104898200B (en) | 2015-06-25 | 2018-03-16 | 长飞光纤光缆股份有限公司 | A kind of ultralow decay single-mode fiber for adulterating optimization |
| CN107082558B (en) * | 2017-04-27 | 2019-12-03 | 烽火通信科技股份有限公司 | A method of single mode optical fiber is manufactured using preform |
| US20230305224A1 (en) * | 2022-03-26 | 2023-09-28 | Sterlite Technologies Limited | Multi-clad optical fibers |
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|---|---|---|---|---|
| CN1765789A (en) * | 2005-09-15 | 2006-05-03 | 长飞光纤光缆有限公司 | Method for making low water peak optical fiber preformrod adopting plasm outward spraying method |
| CN102249533A (en) * | 2011-04-28 | 2011-11-23 | 长飞光纤光缆有限公司 | Method for manufacturing large-size low-water-peak prefabricated rod |
| CN102320732A (en) * | 2011-08-25 | 2012-01-18 | 长飞光纤光缆有限公司 | Method for preparing optical fiber preform rod |
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| US6269663B1 (en) * | 1998-03-05 | 2001-08-07 | Alcatel | Method of purifying silica and depositing on an optical fiber preform |
| CN1792911A (en) * | 2005-10-28 | 2006-06-28 | 长飞光纤光缆有限公司 | Low attenuation fibre-optical and mfg. process thereof |
| CN101585658A (en) * | 2009-06-23 | 2009-11-25 | 长飞光纤光缆有限公司 | Optical fiber perform and manufacture method thereof |
| CN101598834B (en) * | 2009-06-26 | 2011-01-19 | 长飞光纤光缆有限公司 | Single mode fiber and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1765789A (en) * | 2005-09-15 | 2006-05-03 | 长飞光纤光缆有限公司 | Method for making low water peak optical fiber preformrod adopting plasm outward spraying method |
| CN102249533A (en) * | 2011-04-28 | 2011-11-23 | 长飞光纤光缆有限公司 | Method for manufacturing large-size low-water-peak prefabricated rod |
| CN102320732A (en) * | 2011-08-25 | 2012-01-18 | 长飞光纤光缆有限公司 | Method for preparing optical fiber preform rod |
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