CN105060701B - A kind of preparation method of large scale bend-insensitive multimode optical fiber preform - Google Patents
A kind of preparation method of large scale bend-insensitive multimode optical fiber preform Download PDFInfo
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Abstract
The present invention relates to a kind of preparation methods of large scale bend-insensitive multimode optical fiber preform, it first passes through method in pipe and is doped deposition, form multimode fibre sandwich layer, after the completion of deposition, by heating furnace by deposited tube collapsing at solid mandrel, using plug obtained as target rod, deposition is doped by method technique outside pipe, deposits sink covering and surrounding layer respectively；Alternatively, carrying out negative doping by method technique in pipe with pure quartz glass outer liner tube, the sagging covering and surrounding layer of prefabricated rods are constituted；Then plug obtained and the outer tube deposited are combined into the preform for RIT techniques, or the two collapsing is combined into the preform for RIT techniques by the quartz glass sleeve combined set of plug obtained and fluorine doped or boron with SCR techniques at solid bar, then by the solid bar and major diameter outer tube.Not only outer diameter is big for preform produced by the present invention, and sandwich layer precision is high, and low manufacture cost, and method is easy flexibly, is suitble to large-scale production.
Description
Technical field
The present invention relates to a kind of preparation methods of large scale bend-insensitive multimode optical fiber preform, belong to optical communication technique
Field.
Background technology
Bend-insensitive multimode fibre with its cheap system cost, suitable bandwidth and ideal bending resistance, at
For the high-quality solution of short distance high rate data transmission network, it is widely used to data center, municipal office center, high-performance calculation
The fields such as center and storage area network.Survey report shows that the whole world is just being increasing year by year the demand of multimode fibre.China is
Increase one of multimode fibre market the most rapid.
In recent years, network transmission speed develops rapidly, and maturation is used in many data centers, enterprise to 10Gb/s Ethernets
Industry net and municipal office center.Also, demand of the user to bandwidth is still constantly rising, and the network service of 40Gb/s and 100Gb/s will
It can be more and more.To adapt to the needs of high speed Ethernet, bend-insensitive bandwidth for multimode optical fibers needs step up.To obtain
The refractive index profile of high bandwidth, fiber core layer must conform exactly to expected parabolic shape.The existing preform of preparing
Method is roughly divided into two classes according in pipe and outside pipe：PCVD(Plasma Activated Chemical Vapor
Deposition) and MCVD (Modified Chemical Vapor Deposition) etc. belongs to method in pipe, chemical reaction hair
The raw inner wall in carrier bushing pipe；OVD (Outside Vapor Deposition) and VAD (Vapor Axial Deposition)
Etc. belonging to method outside pipe, chemical reaction is happened at the outer wall of target rod.The outer method of pipe is limited by its process characteristic, the control of refractive index section
Precision processed is relatively low, is not suitable for preparing the bend-insensitive multimode fibre sandwich layer for needing high precision refraction rate to be distributed；But it is heavy
Product is efficient, in the relatively low covering of preparation refractive index Spreading requirements, has cost advantage.Rule is toward subdivision in pipe
Laminar sedimentation, prepared prefabricated rods are made of thousands of layers of sedimentary, are had accurate index distribution, are to prepare high bandwidth
The comparatively ideal technique of bend-insensitive multimode fibre.However pipe in method relative to method outside pipe, deposition efficiency is relatively low, sedimentation time compared with
It is long.Therefore, a kind of optic fibre manufacture process how is invented, both can guarantee the good bandwidth of multimode fibre and bend-insensitive performance,
Multimode fibre cost can be reduced again, become a major challenge of optical fiber production manufacturing enterprise.
Studies have shown that it is one of the effective ways for reducing its manufacturing cost greatly that preform size, which is done,.Creation data
Statistics display, for the prefabricated rods of D60mm compared with D40mm, average wire drawing cost savings amplitude is one one-tenth nearly, wire-drawing equipment operating effect
Rate improves about 11%.Meanwhile preform diameter increases, single prefabricated stick drawn wire length increase, then frequency is made in clubs up and down when wire drawing
Rate reduces, to reduce consumption and the human cost of auxiliary raw material.It is limited by liner dimensions and stress are too big, manages interior method
Multimode fibre plug size obtained is difficult to do greatly.Currently, in the world bend-insensitive multimode optical fiber preform using PCVD or
The advanced level that MCVD techniques are commercially produced is that diameter reaches 49mm.Since the sandwich layer doping concentration of multimode fibre is higher, core
Diameter is larger, is easy to form larger stress with the interface of pure quartz glass extension tube, plug is brought to be broken in preparation process
Risk.And the stick diameter deposited is bigger, the stress of generation is bigger, and this risk of breakage is higher.It is limited to this, manages interior method
Prefabricated rods be difficult further do it is big.
Currently, the refractive index profile of mainstream bend-insensitive multimode fibre is mainly by containing positive doping component (such as GeO2、
Al2O3、P2O5Deng) gradual change mandrel layers and covering containing negative doping component (such as fluorine element, boron element) constitute.With Fig. 1 institutes
For showing cross section of optic fibre schematic diagram, mainly comprising 10 part of sandwich layer, 20 part of inner cladding, sagging 30 part of covering and surrounding layer
40 parts.Fig. 2 is corresponding Refractive Index Profile of Optical schematic diagram.10 refractive index of sandwich layer meets power law index distribution, point
Cloth index α must be accurately controlled, and refractive index curve is more accurate, and fluctuation is smaller, and gained multi-mode ribbons wide feature is better.
Relative to other techniques, had a clear superiority using PCVD or MCVD process deposits multimode fibre sandwich layers part.20 part of inner cladding
Generally it is made of pure quartz glass.The covering 30 that sink generally is made of the quartz glass of fluorine doped or boron, unwise to the bending of optical fiber
Perception can play critical effect.The surrounding layer 40 for the optical fiber that pure quartz glass is constituted.Existing method is usually used
PCVD or MCVD process deposits go out the plug of this 3 part of sandwich layer 10, inner cladding 20 and sagging covering 30 composition, then cover one layer of quartz
Glass cloth pipe makees 40 part of surrounding layer.In fact, the advantage of method is the accurate refraction rate needed for deposition of core layer part in pipe,
And the requirement of inner cladding and sagging clad section for refractive index accuracy is relatively low.Sandwich layer, inner cladding and sagging cladding part
Divide and occupies the plug size that method can deposit in pipe jointly.
In addition, the characteristics of PCVD or MCVD techniques is layer by layer deposition from outside to inside, i.e., 30 part of covering of sinking first is deposited, so
20 part of sedimentary inner envoloping layer afterwards, 10 part of last deposition of core layer.I.e. sandwich layer is not directly deposited on smooth bushing pipe inner wall, and
It is redeposited sandwich layer on the basis of thousands of layers of sedimentary.This flatness for starting thousands of layers of product directly affects core layer section score
The progress of thousand layers of deposition reaction.Continued when the geometric error of outer layer sedimentary is to deposition of core layer and accumulate amplification, and is influenced
Optical fiber last geometrical homogenization and index of refraction homogeneity, to influence bandwidth of an optical fiber performance.
Invention content
The content of present invention is introduced for convenience, defines part term：
Prefabricated rods：The radial refractive index distribution being made of sandwich layer and covering meets fiber design requirement, can directly be drawn into
The glass bar or assembly of designed optical fiber；
Plug：By PCVD technique primary depositings, the prefabricated component containing sandwich layer and part of clad；
Casing：Meet the quartz glass tube of certain geometry and doping requirement；
Wall thickness：The one-sided thickness of tubular glass material, i.e. wall thickness=(outer diameter-internal orifice dimension)/2；
RIT techniques：Rod In Tube will form preform in plug plug-in-sleeve；
SCR techniques：Solid Core Rod, by plug and sleeve-assembled and collapsing is at solid bar；
Positive doping：The doping of pure quartz glass refractive index can be improved；
Negative doping：The doping of pure quartz glass refractive index can be reduced；
Refractive index profile：Relationship between optical fiber or preform (including plug) refractive index and its radius；
Relative fefractive index difference (delta)：
niAnd n0Respectively each corresponding part and pure quartz glass refractive index, unless separately explaining, niFor each corresponding part
Largest refractive index；
Power law index distribution：Meet the index distribution of following power exponential function, wherein n1For optical fiber axle center
Refractive index；R is the distance for leaving optical fiber axle center；A is optical fiber core radius；α is profile exponent；Δ is core/packet relative fefractive index difference
(core delta)；
The technical problem to be solved by the present invention is to overcome above-mentioned the shortcomings of the prior art offer is a kind of preparing big ruler
The preparation method of very little bend-insensitive multimode optical fiber preform, using the not only outer diameter of preform made from this method
Greatly, precision is high, and low manufacture cost, is suitble to large-scale production.
The present invention be solve the problems, such as it is set forth above used by technical solution be：
Prepare plug：It uses pure quartz glass bushing pipe as the base tube of deposition reaction, is mixed by PCVD or MCVD techniques
Miscellaneous deposition forms multimode fibre sandwich layer, after the completion of deposition, by heating furnace by deposited tube collapsing at solid mandrel, in bushing pipe
Sedimentary constitutes the sandwich layer of preform, and core refractive rate meets power law index distribution, meets wanting for profile exponent α
It asks, sandwich layer relative fefractive index difference is △ 1max, △ 1max ＞ 0, and the bushing pipe rest part constitutes all or part of interior packet
Layer；
The outer diameter of the pure quartz glass bushing pipe is 32~50mm, and internal diameter is 31~49mm, and the sedimentary is unilateral
Thickness is 5~18mm, a diameter of 30~45mm of solid mandrel after the collapsing；
Prepare sink covering and surrounding layer：
Using plug obtained as target rod, deposition is doped by VAD or OVD techniques, deposits the covering and outer of sinking respectively
The relative fefractive index difference of covering, the sagging covering is △ 3min, △ 3min ＜ 0, and deposition generates loose porous green body, leads to
Oversintering forms solid core fibres prefabricated rods；
Alternatively, pure quartz glass outer liner tube is used to carry out deposition reaction as outer tube, carried out by PCVD or MCVD techniques
Doping deposition, described is doped to negative doping, and the sedimentary constitutes the sagging covering of prefabricated rods, the opposite folding for the covering that sink
It is △ 3min, △ 3min ＜ 0 to penetrate rate difference, and the outer liner tube rest part constitutes all or part of surrounding layer；It then will system
Plug and the outer tube that has deposited be combined into the preform for RIT techniques, or by plug obtained and fluorine doped
Or the quartz glass sleeve combined set of boron with SCR techniques by the two collapsing at solid bar, then will be outside the solid bar and major diameter
Sleeve combination constitutes the surrounding layer of prefabricated rods at the preform for RIT techniques, the major diameter outer tube.
By said program, the outer diameter of the solid core fibres prefabricated rods or the outer diameter for being converted into solid core fibres prefabricated rods are 65
~120mm is further 85~110mm.
By said program, sandwich layer a diameter of 25~40mm of the preform or solid core fibres prefabricated rods is described
Inner cladding diameter be 30~45mm, the sagging cladding diameter be 35~75mm.
By said program, the sandwich layer relative fefractive index difference △ 1max are 0.08~1.30%, and profile exponent α is 1.90
~2.15, the inner cladding relative fefractive index difference △ 2 are -0.03~0.03%, and the sagging cladding relative refractive is poor
△ 3min are -0.75~-0.20%, and the surrounding layer is pure quartz glass layer.
By said program, the sandwich layer diameter axial direction distribution error control of the preform is 0.1~1.0mm, core
Layer profile exponent alpha axial direction distribution error control is 0.01~0.10, and sandwich layer relative fefractive index difference axial direction distributed controll is
0.05~0.15%.
By said program, the pure quartz glass outer lining pipe outside diameter is 32~50mm, and internal diameter is 31~49mm, described
Negative doping sedimentary one-sided thickness is 1~15mm.
By said program, the differential mode time delay (DMD) of the optical fiber made by the preform meets following standard：
(0-23 μm) of DMD Inner Mask (5-18 μm) and DMD Outer Mask are respectively less than and are equal to 0.33ps/m；DMD Interval
Mask is less than or equal to 0.25ps/m；The Inner Mask (5-18 μm) and DMD Outer Mask of the DMD of optical fiber under optimum condition
(0-23 μm) is respectively less than equal to 0.14ps/m, and DMD Interval Mask are less than or equal to 0.11ps/m.
By said program, optical fiber made by the preform 850nm wavelength have 1500MHz-km or
1500MHz-km band above has 500MHz-km or 500MHz-km band above in 1300nm wavelength.
Further, optical fiber has 3500MHz-km or 3500MHz-km band above in 850nm wavelength, in 1300nm
Wavelength has 500MHz-km or 500MHz-km band above.
More preferably situation, optical fiber has 5000MHz-km or 5000MHz-km band above in 850nm wavelength, in 1300nm
Wavelength has 600MHz-km or 600MHz-km band above.
By said program, optical fiber made by the preform 850nm wavelength have 2000MHz-km or
The effective model bandwidth (EMB) of 2000MHz-km or more.
Further, optical fiber has the effective model band of 4700MHz-km or 4700MHz-km or more in 850nm wavelength
Wide (EMB).
By said program, the numerical aperture of the optical fiber made by the preform is 0.185~0.215.
By said program, the optical fiber made by the preform is at 850nm wavelength, with 7.5 millimeters of bending radius
The bending added losses caused by 2 circles are less than 0.2dB, even up to 0.02dB；At 1300nm wavelength, it is bent with 7.5 millimeters
Radius bending added losses caused by 2 circles are less than 0.5dB, even up to 0.1dB.
Experiment display, with the multimode fibre of PCVD or MCVD techniques deposition of core layer (technique A) directly on bushing pipe, with
Sink covering, inner cladding of PCVD or MCVD process deposits is compared with the multimode fibre of sandwich layer (technique B), the sedimentary of the two sandwich layer
In the case of number is identical, the ratio bigger of the former output high bandwidth optic fibre.This is related with the axial parameter distribution of prefabricated rods.Technique
The axial parameter distribution of A and technique B preforms obtained respectively is shown in shown in Fig. 3~5.It is rolled over from core diameter, the sandwich layer of prefabricated rods
It penetrates from the point of view of the axial distribution of these three parameters of rate profile exponent α and sandwich layer relative fefractive index difference, prefabricated rods are compared with work made from technique A
The stabilization that is more evenly distributed of skill B, the especially part at prefabricated rods both ends.Optical signal is propagated along optical fiber axial direction, ensures optical fiber as possible
Axial parameter in communication distance is uniform, all has suitable core diameter, core refractive rate profile exponent and sandwich layer relative
The parameters such as rate difference could obtain bandwidth big as possible, as possible long communication distance.Meanwhile after prefabricated rods sandwich layer size is amplified,
The deposition number of plies that composition bend-insensitive multimode fibre core diameter is included increases, i.e., sandwich layer need to obtain finer control, refraction
Rate section can be more smooth, is just conducive to the guarantee and raising of multi-mode ribbons wide feature.
The beneficial effects of the present invention are：1, bend-insensitive multimode optical fiber preform outer diameter made from the method for the present invention
Greatly, fiber manufacturing efficiency is effectively increased, to reduce optical fiber cost；2, the present invention can accomplish PCVD or MCVD techniques
Maximum plug be completely used for deposition of core layer, then using more efficient technique and mode come obtain inner cladding, sink covering
And surrounding layer, then the size of whole preform is further amplified, while also ensuring the accurate control of core refractive rate
System so that not only radial refractive index section is smooth for preform, but also axial parameter distribution is uniform, and gained optical fiber has bandwidth
High, the advantages that bend-insensitive performance is good；3, manufacturing method of the present invention is easy flexibly, is suitable for large-scale production.
Description of the drawings
Fig. 1 is the made optical fiber radial cross section of one embodiment of the invention.
Fig. 2 is the made Refractive Index Profile of Optical schematic diagram of one embodiment of the invention.
Fig. 3 is the core diameter axial direction distribution map of preform made from technique A and technique B two ways.
Fig. 4 is the core refractive rate profile exponent alpha axial direction point of preform made from technique A and technique B two ways
Butut.
Fig. 5 is that the sandwich layer relative fefractive index difference of preform made from technique A and technique B two ways is axially distributed
Figure.
Fig. 6 is a kind of preparation technology flow chart of prefabricated rods of the present invention.
Fig. 7 is a kind of preparation technology flow chart of prefabricated rods of the present invention.
Fig. 8 is a kind of preparation technology flow chart of prefabricated rods of the present invention.
Specific implementation mode
Several detailed embodiments are given below, the present invention is further illustrated.
Method 1：It is doped deposition in pure quartz glass bushing pipe inner wall by PCVD techniques, reaction gas is passed through into pipe
Silicon tetrachloride (SiCl4) and oxygen (O2), then it is passed through fluoro-gas (C2F6) and germanium tetrachloride (GeCl4) to carry out refractive index
It adjusts, whole process accurately controls gas flow by mass flow controller (MFC)；Make the reaction gas in bushing pipe by microwave
As plasma, and bushing pipe inner wall is finally deposited in the form of glass, sedimentary all constitutes the sandwich layer 10 of prefabricated rods, lining
Pipe rest part constitutes all or part of inner cladding 20；After the completion of deposition, with electric furnace by deposited tube collapsing at solid core
Stick；PCVD or MCVD techniques are used to carry out fluorine doped deposition in pure quartz glass outer sleeve inner wall again, sedimentary all constitutes prefabricated
The sagging covering 30 of stick, outer tube rest part constitute surrounding layer 40；Plug and the outer tube deposited are used into RIT technique groups
Synthetic fibre-optical prefabricated rods；Prefabricated rods are placed on fiber drawing tower and are drawn into optical fiber.Process flow chart is as shown in Figure 6.
Method 2：It is doped deposition in pure quartz glass bushing pipe inner wall by PCVD techniques, reaction gas is passed through into pipe
Silicon tetrachloride (SiCl4) and oxygen (O2), then it is passed through fluoro-gas (C2F6) and germanium tetrachloride (GeCl4) to carry out refractive index
It adjusts, whole process accurately controls gas flow by mass flow controller (MFC)；Make the reaction gas in bushing pipe by microwave
As plasma, and bushing pipe inner wall is finally deposited in the form of glass, sedimentary all constitutes the sandwich layer 10 of prefabricated rods, lining
Pipe rest part constitutes all or part of inner cladding 20；After the completion of deposition, with electric furnace by deposited tube collapsing at solid core
Stick；It uses VAD or OVD techniques to be sequentially depositing sagging covering 30 and surrounding layer 40 in plug outer surface using plug as target rod again, sinks
Product generates loose porous green body, finally is sintered to form preform；Prefabricated rods are placed on fiber drawing tower and are drawn
At optical fiber.Process flow chart is as shown in Figure 7.
Method 3：Pure quartz glass bushing pipe is mounted on MCVD lathes, reaction gas silicon tetrachloride (SiCl is passed through4) and
Oxygen (O2) it is doped deposition；It is passed through fluoro-gas (C again2F6) and germanium tetrachloride (GeCl4) to carry out the adjusting of refractive index,
Whole process accurately controls gas flow by mass flow controller (MFC)；It is carried in such a way that outside is heated using oxyhydrogen flame
For reacting required energy, reactant is set finally to be deposited on bushing pipe inner wall in the form of glass, sedimentary all constitutes prefabricated rods
Sandwich layer 10, bushing pipe rest part constitutes all or part of inner cladding 20；After the completion of deposition, deposited tube is melted with electric furnace
Shorten solid mandrel into；By solid mandrel be inserted into fluorine doped finished product quartz glass sleeve with SCR techniques by the two collapsing at solid bar, then
The solid bar and major diameter outer tube are combined into the preform for RIT techniques, fluoro-alloyed quartz glass casing constitutes pre-
The sagging covering 30 of stick processed；The major diameter outer tube constitutes the surrounding layer of prefabricated rods.Prefabricated rods are placed in fiber drawing tower
On be drawn into optical fiber.Process flow chart is as shown in Figure 8.
It is prepared for one group of prefabricated rods and wire drawing as stated above, the structure and Specifeca tion speeification of optical fiber are shown in Table 1.
Table 1：The primary structure performance parameter of prefabricated rods preparation process and gained optical fiber
Claims (7)
1. a kind of preparation method of large scale bend-insensitive multimode optical fiber preform, it is characterised in that
Prepare plug：
It uses pure quartz glass bushing pipe as the base tube of deposition reaction, deposition is doped by PCVD or MCVD techniques, is formed more
Mode fiber sandwich layer, after the completion of deposition, by heating furnace by deposited tube collapsing at solid mandrel, the sedimentary in bushing pipe constitutes optical fiber
The sandwich layer of prefabricated rods, core refractive rate meet power law index distribution, meet the requirement of profile exponent α, and sandwich layer is opposite to be rolled over
It is △ 1max, △ 1max ＞ 0 to penetrate rate difference, and the bushing pipe rest part constitutes all or part of inner cladding；
The outer diameter of the pure quartz glass bushing pipe is 32~50mm, and internal diameter is 31~49mm, the sedimentary one-sided thickness
For 5~18mm, a diameter of 30~45mm of solid mandrel after the collapsing；
Prepare sink covering and surrounding layer：
Using plug obtained as target rod, deposition is doped by VAD or OVD techniques, deposits sink covering and surrounding layer respectively,
The relative fefractive index difference of the sagging covering is △ 3min, △ 3min ＜ 0, and deposition generates loose porous green body, passes through burning
Knot forms solid core fibres prefabricated rods；
Or by plug obtained with the quartz glass sleeve combined set of fluorine doped or boron with SCR techniques by the two collapsing at solid
Stick, then the solid bar and major diameter outer tube are combined into the preform for RIT techniques, the major diameter outer tube
Constitute the surrounding layer of prefabricated rods；
The outer diameter of the solid core fibres prefabricated rods or the outer diameter for being converted into solid core fibres prefabricated rods are 65~120mm；Described
Preform or a diameter of 27.29~40mm of the sandwich layer of solid core fibres prefabricated rods, the inner cladding diameter are 30~45mm,
Cladding diameter of sinking is 35~75mm.
2. the preparation method of large scale bend-insensitive multimode optical fiber preform as described in claim 1, it is characterised in that institute
The sandwich layer relative fefractive index difference △ 1max stated are 0.80~1.30%, and profile exponent α is 1.90~2.15, the inner cladding phase
Refractive index difference △ 2 is -0.03~0.03%, and the cladding relative refractive difference △ 3min that sink are -0.75~-0.20%, outsourcing
Layer is pure quartz glass layer.
3. the preparation method of large scale bend-insensitive multimode optical fiber preform as described in claim 1, it is characterised in that institute
The sandwich layer diameter axial direction distribution error control for the preform stated is 0.1~1.0mm, core refractive rate profile exponent alpha axial direction
Distribution error control is 0.01~0.10, and sandwich layer relative fefractive index difference axial direction distributed controll is 0.05~0.15%.
4. the preparation method of large scale bend-insensitive multimode optical fiber preform as described in claim 2, it is characterised in that institute
The differential mode time delay for stating the optical fiber made by preform meets following standard：DMD Inner Mask 5-18 μm and DMD
Outer Mask 0-23 μm, which are respectively less than, is equal to 0.33ps/m；DMD Interval Mask are less than or equal to 0.25ps/m.
5. the preparation method of large scale bend-insensitive multimode optical fiber preform as described in claim 2, it is characterised in that institute
State the optical fiber made by preform has the bandwidth more than or equal to 1500MHz-km in 850nm wavelength, in 1300nm waves
The long bandwidth having more than or equal to 500MHz-km.
6. the preparation method of large scale bend-insensitive multimode optical fiber preform as described in claim 2, it is characterised in that institute
State the optical fiber made by preform has the effective model bandwidth more than or equal to 2000MHz-km in 850nm wavelength；Institute
The numerical aperture for stating the optical fiber made by preform is 0.185~0.215.
7. the preparation method of large scale bend-insensitive multimode optical fiber preform as described in claim 2, it is characterised in that institute
The optical fiber made by preform is stated at 850nm wavelength, with 7.5 millimeters of bending radius additional damage of bending caused by 2 circles
Consumption is less than 0.2dB, at 1300nm wavelength, is less than 0.5dB with 7.5 millimeters of bending radius bending added losses caused by 2 circles.
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| CN105330140B (en) * | 2015-11-30 | 2018-11-09 | 中天科技精密材料有限公司 | A kind of preparation method of large-scale optical fiber prefabricating stick high purity quartz casing |
| CN106116135B (en) * | 2016-06-21 | 2019-01-18 | 浙江富通光纤技术有限公司 | A kind of manufacturing method of pure silicon core low loss fiber |
| CN106094104B (en) * | 2016-06-22 | 2019-07-23 | 长飞光纤光缆股份有限公司 | A kind of bend-insensitive multimode fibre and its manufacturing method |
| CN107151093B (en) * | 2017-06-27 | 2020-06-02 | 长飞光纤光缆股份有限公司 | Preparation method and device of optical fiber preform |
| CN111257994A (en) * | 2018-11-30 | 2020-06-09 | 中天科技精密材料有限公司 | Broadband bending-resistant multimode optical fiber |
| CN109553295B (en) * | 2018-12-25 | 2021-09-10 | 江苏通鼎光棒有限公司 | Large-size low-loss optical fiber preform and manufacturing method thereof |
| CN109665713B (en) * | 2019-01-29 | 2021-09-03 | 江苏永鼎股份有限公司 | Low water peak large-size optical fiber preform and manufacturing method thereof |
| CN112764156B (en) * | 2021-01-12 | 2022-09-16 | 烽火通信科技股份有限公司 | Bending insensitive polarization maintaining optical fiber |
| CN113292240B (en) * | 2021-06-17 | 2022-06-17 | 长飞光纤光缆股份有限公司 | Deposition method of core layer of graded-index profile optical fiber preform |
| CN113716861A (en) * | 2021-08-11 | 2021-11-30 | 山东富通光导科技有限公司 | Method for preparing bending insensitive optical fiber by external gas phase deposition method |
| CN113946012B (en) * | 2021-11-02 | 2023-04-07 | 长飞光纤光缆股份有限公司 | Bending-resistant optical fiber and preparation method thereof |
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| CN102153275B (en) * | 2010-12-27 | 2013-04-03 | 富通集团有限公司 | Method for manufacturing bent insensitive optical fiber preformed rod |
| CN103033874A (en) * | 2011-10-09 | 2013-04-10 | 江苏亨通光纤科技有限公司 | Bend-insensitive single mode fiber and preparation method thereof |
| CN104291676B (en) * | 2014-08-25 | 2016-07-13 | 长飞光纤光缆股份有限公司 | A kind of manufacture method of large scale bend-insensitive multimode optical fiber preform |
| CN104698535A (en) * | 2015-03-31 | 2015-06-10 | 长飞光纤光缆股份有限公司 | Bent insensitive multi-mode optical fiber |
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