CN107678088A - The single-mode fiber of low attenuation large effective area - Google Patents
The single-mode fiber of low attenuation large effective area Download PDFInfo
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- CN107678088A CN107678088A CN201711096647.9A CN201711096647A CN107678088A CN 107678088 A CN107678088 A CN 107678088A CN 201711096647 A CN201711096647 A CN 201711096647A CN 107678088 A CN107678088 A CN 107678088A
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- 239000000835 fiber Substances 0.000 title claims abstract description 36
- 239000013307 optical fiber Substances 0.000 claims abstract description 60
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005253 cladding Methods 0.000 claims abstract description 22
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 18
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 18
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 11
- 238000007665 sagging Methods 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- 229910052732 germanium Inorganic materials 0.000 claims description 6
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 6
- HHFCFXJTAZTLAO-UHFFFAOYSA-N fluorogermanium Chemical compound [Ge]F HHFCFXJTAZTLAO-UHFFFAOYSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 229910001413 alkali metal ion Inorganic materials 0.000 claims description 2
- 229910052792 caesium Inorganic materials 0.000 claims description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 2
- 229910052730 francium Inorganic materials 0.000 claims description 2
- KLMCZVJOEAUDNE-UHFFFAOYSA-N francium atom Chemical compound [Fr] KLMCZVJOEAUDNE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052701 rubidium Inorganic materials 0.000 claims description 2
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 claims 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000011521 glass Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 39
- 230000005540 biological transmission Effects 0.000 description 15
- 230000003287 optical effect Effects 0.000 description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 230000009022 nonlinear effect Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910003978 SiClx Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03605—Highest refractive index not on central axis
- G02B6/03611—Highest index adjacent to central axis region, e.g. annular core, coaxial ring, centreline depression affecting waveguiding
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Glass Compositions (AREA)
Abstract
The present invention relates to a kind of single-mode fiber with low attenuation large effective area.Include sandwich layer and covering, it is characterised in that the radius r of the sandwich layer1For 5.4~6.5 μm, refractive index contrast Δ n1For 0.18%~0.32%, sandwich layer is coated with covering, and side includes inner cladding to described covering successively from inside to outside, sink covering and surrounding layer, the radius r of the inner cladding2For 9~13 μm, refractive index contrast Δ n2For 0.10%~0.10%, the radius r of the sagging covering3For 10.5~15 μm, refractive index contrast Δ n3For 0.60%~0.35%；Described surrounding layer is pure silicon dioxide glassy layer.The present invention is optimized using alkali metal to core covering viscosity, to improve optical fiber attenuation performance；Simultaneously by rationally designing core covering waveguiding structure, make optical fiber that there is larger effective area；Present invention process is simple, is easy to prepare large-scale optical fiber prefabricating stick, outermost surrounding layer uses the design of pure silicon dioxide, Fluorin doped glass proportion in a fiber reduced, so as to reduce fiber manufacturing production cost.
Description
Technical field
The present invention relates to optical fiber transmission technique field, and in particular to a kind of single-mode optics with low attenuation large effective area
It is fine.
Background technology
With increasing rapidly for IP network data service, operator improves constantly for the demand of transmission capacity, in existing network
Single fiber capacity is gradually approaching limiting value 100Tbps.100G Transmission systems have started to enter the commercial first year.How to be passed in 100G
Further increase transmission capacity on the basis of defeated signal, be each system equipment business and operator's focus of attention.
In 100G and super 100G systems, receiving terminal uses coherent reception and Digital Signal Processing (DSP), Neng Gou
The dispersion and polarization mode dispersion (PMD) accumulated in electrical domain in the whole transmitting procedure of digital compensation；Signal is answered by using polarization mode
With the baud rate of signal, such as PM-QPSK, PDM-16QAM, PDM-32QAM is reduced with various high-order modulatings, even
PDM-64QAM and CO-OFDM.But high-order modulating is very sensitive to nonlinear effect, therefore to OSNR (OSNR)
Propose higher requirement.Low-loss large effective area fiber is introduced, can be that system brings raising OSNR and reduces non-linear effect
For the effect answered when using high power density system, nonlinear factor is that systematic function caused by being used to assess nonlinear effect is excellent
Bad parameter, it is defined as n2/Aeff.Wherein, n2It is the nonlinear refraction index of Transmission Fibers, AeffIt is the effective of Transmission Fibers
Area.Increase the effective area of Transmission Fibers, the nonlinear effect in optical fiber can be reduced.
The general single mode fiber of land Transmission system circuit is presently used for, only about 80 μm of its effective area2Left and right.And
In the long haul transmission system of land, higher is required to the effective area of optical fiber, in general effective area is in 100um2More than.In order to
Laying cost is reduced, the use of repeater is reduced as far as possible, in repeatless transmission system, such as undersea transmission system, transmission light
Fine effective area is preferably in 130um2More than.However, at present in the design of the refractive index profile of large effective area fiber, often
Big effective area is obtained by increasing the diameter for the optical core layer for being used to transmit optical signal.There is certain for such scheme
Design difficulty.On the one hand, the sandwich layer of optical fiber and its close covering mainly determine the basic performance of optical fiber, and in fiber manufacturing
Larger proportion is occupied in cost, if the radial dimension of design is excessive, the manufacturing cost of optical fiber will necessarily be improved, raise optical fiber
Price, by as the commonly used obstacle of this type optical fiber.On the other hand, compared to general single mode fiber, the increasing of optical fiber effective area
Greatly, the deterioration of some other parameter of optical fiber can be brought：It is difficult if cutoff wavelength is excessive for example fiber cut off wavelength can increase
To ensure the single mode of optical fiber optical signal in wave band is transmitted；In addition, if Refractive Index Profile of Optical design is improper, can also lead
Cause the deterioration of the parameters such as bending property, dispersion.
The optic fibre characteristic of another kind limitation long range high capacity transmission is exactly to decay, current conventional G.652.D optical fiber
Decay is typically gradually reduced in 0.20dB/km, laser energy after being transmitted through long-distance, so needing the form using relaying
Signal is amplified again.And the relative cost with optical fiber cable, relay station relevant device and maintenance cost are in whole chain-circuit system
More than 70%, if so being related to a kind of low decay or ultralow attenuating fiber, it is possible to effectively extend transmission distance, subtract
Few construction and maintenance cost.By correlation computations, if the decay of optical fiber is reduced into 0.16dB/km, whole link from 0.20
Construction cost by overall reduction 30% or so.
In summary, exploitation, which designs a kind of low attenuation large effective area optical fiber, turns into an important class of optical fiber fabrication arts
Topic.Document US2010022533 proposes a kind of design of large effective area fiber, and in order to obtain lower Rayleigh coefficient, it is adopted
With the design of pure silicon core, in the core without the codope for carrying out germanium and fluorine, and its design is made using the silica of fluorine doped
For surrounding layer.Design for this pure silicon core, it requires that inside of optical fibre must carry out the viscosity matching of complexity, and requires drawing
Use extremely low speed during silk, the defects of avoiding high-speed wire-drawing from causing inside of optical fibre, caused decay increased, manufacturing process
It is extremely complex.
Document EP2312350 proposes a kind of large effective area fiber design of non-pure silicon core design, and it uses stepped
The cladding structure that sink designs, and has a kind of design to use pure silicon dioxide outsourcing Rotating fields, and correlated performance can reach big effectively
The area fiber G.654.B requirement with D.But the clad section maximum radius of Fluorin doped is 36 μm in its design, although can be with
Ensure that the cutoff wavelength of optical fiber is less than or equal to 1530nm, but influenceed by its smaller Fluorin doped radius, optical fiber it is microcosmic and grand
See bending property to be deteriorated, so during optical fiber cabling, decay can be caused to increase, also do not refer to related bending in its document
Performance.
Document CN10232392A describes a kind of optical fiber with more large effective area.The invention optical fiber it is effective
Although area has reached 150 μm2More than, but because employ the sandwich layer design that conventional germanium fluorine is co-doped with mode, and by sacrificial
What the performance indications of domestic animal cutoff wavelength were realized.It allows cable cut-off wavelength in more than 1450nm, in its described embodiment,
Cabled cutoff wavelength has been even up to more than 1800nm.Among practical application, too high cutoff wavelength is difficult to ensure that optical fiber exists
Ended in application band, it is in single mode in transmission that just can not ensure optical signal.Therefore, the type optical fiber in the application may be used
A series of practical problems can be faced.In addition, in embodiment cited by the invention, sink cladding outer diameter r3Minimum 16.3 μm,
It is equally bigger than normal.The invention is no can be in optical fiber parameter (e.g., effective area, cutoff wavelength etc.) and fiber manufacturing cost
Obtain optimum combination.
Document CN201510464355.0 discloses a kind of design of ultralow attenuation large effective area optical fiber, and it is in sandwich layer
Position has carried out alkali-metal-doped, does not have alkali-metal-doped in inner cladding；Without Related Component composition is announced in its inner cladding, no
It is related to the fluorin-doped design of germanium；And its Section Design and each covering part composition are not announced.
Document CN104777551A discloses a kind of design of low attenuation large effective area optical fiber, and it is relatively low in order to realize
Attenuation coefficient, using multi-layer structure design, the transition inner cladding of Fluorin doped is especially devised in optical fiber outermost, although can be with
It is effective to realize optical fiber attenuation reduction.But sandwich construction preparation technology is complicated, and Fluorin doped glass viscosity is relatively low, cost is high, no
Beneficial to overall reduction optical fiber attenuation.
The content of the invention
It is definition and the explanation for some terms being related in the present invention below：
Refractive index contrast Δ ni：
Counted since fiber core axis, according to the change of refractive index, that layer being defined as near axis is optical fiber
Sandwich layer, the outermost layer of optical fiber is that pure silicon dioxide layer is defined as optical fiber jacket.
Each layer refractive index contrast Δ n of optical fiberiDefined by below equation,
Wherein niFor the refractive index of optical fiber each position glass, and ncFor the refraction of cladding refractive index, i.e. pure silicon dioxide
Rate.
Fiber core layer and the relative index of refraction contribution amount Δ F of inner cladding F dopingiDefined by below equation,
Wherein nFTo assume the F dopants of sandwich layer or inner cladding position, the pure dioxy without other dopants is being doped to
In SiClx glass, cause the variable quantity of silica glass refractive index, wherein ncFor outermost cladding index, i.e. pure silicon dioxide
Refractive index.
The effective area A of optical fibereff：
Wherein, E is the electric field relevant with propagation, and r is the distance between axle center to Electric Field Distribution point.
Cable cut-off wavelength λcc：
Defined in IEC (International Electrotechnical Commission) standard 60793-1-44：Cable cut-off wavelength λccIt is optical signal in optical fiber
In have propagated and not be re-used as the wavelength that single mode signal is propagated after 22 meters.Test when need to by optical fiber around a radius
14cm circle, two radius 4cm circle obtain data.
The technical problems to be solved by the invention are intended to be directed to above-mentioned the shortcomings of the prior art, design a kind of low decay
The single-mode fiber of large effective area, it decays, and low, effective area is big, and low manufacture cost.
The present invention is to solve the problems, such as that used technical scheme set forth above is：Include sandwich layer and covering, its feature
It is the radius r of the sandwich layer1For 5.4~6.5 μm, refractive index contrast Δ n1For 0.18%~0.32%, sandwich layer is coated with
Covering, side includes inner cladding to described covering successively from inside to outside, sink covering and surrounding layer, the radius r of the inner cladding2For
9~13 μm, refractive index contrast Δ n2For -0.10%~0.10%, the radius r of the sagging covering3For 10.5~15 μm, phase
Refractive index difference Δ n3For -0.60%~-0.35%；Described surrounding layer is pure silicon dioxide glassy layer.
By such scheme, described sandwich layer and inner cladding are the silica glass layer that germanium and alkali metal are co-doped with, or germanium fluorine
The silica glass layer being co-doped with alkali metal, wherein alkali metal content are 100~500ppm.
By such scheme, described sagging covering is the silica glass layer that is co-doped with of fluorine and alkali metal, alkali metal content
For 50~200ppm.
By such scheme, described alkali metal is the one or more in lithium, sodium, potassium, rubidium, caesium, francium alkali metal ion.
By such scheme, the alkali metal concn of the sandwich layer is more than the concentration of inner cladding, and the alkali metal concn of inner cladding is big
In sagging covering position concentration.
By such scheme, the diameter of the preform is more than or equal to 150mm.
By such scheme, the optical fiber is 120~150 μm in the effective area of 1550nm wavelength2。
By such scheme, the cabled cutoff wavelength of the optical fiber is equal to or less than 1530nm.
By such scheme, dispersion of the optical fiber at wavelength 1550nm is equal to or less than 23ps/nm*km, the optical fiber
Dispersion at wavelength 1625nm is equal to or less than 27ps/nm*km.
By such scheme, attenuation coefficient of the optical fiber at wavelength 1550nm is equal to or less than 0.180dB/km；In ripple
Attenuation coefficient at long 1625nm is equal to or less than 0.200dB/km.
By such scheme, mode field diameter of the optical fiber at wavelength 1550nm is 11.5~13 μm.
The beneficial effects of the present invention are：1st, using the sandwich layer of alkali metal and germanium or/and the codope of fluorine, inner cladding and under
Blanket design is fallen into, core covering viscosity is optimized, to improve optical fiber attenuation performance；Simultaneously by rationally designing core covering waveguide
Structure, make optical fiber that there is larger effective area；2nd, the sandwich layer of prefabricated rods of the present invention, interior bag can directly be prepared using one-step method
Layer and sagging covering, technique is simple, is easy to prepare large-scale optical fiber prefabricating stick, reduces overall cost；3rd, outermost surrounding layer
Using the design of pure silicon dioxide, Fluorin doped glass proportion in a fiber is reduced, so as to reduce fiber manufacturing production cost.
Brief description of the drawings
The refractive index profile structure distribution figure of Fig. 1 one embodiment of the invention.
Embodiment
The present invention is explained in further detail and illustrated with reference to embodiments.
Include sandwich layer and covering, closely coat covering outside sandwich layer, side includes interior bag to described covering successively from inside to outside
Layer, sink covering and surrounding layer, the silica glass layer that described sandwich layer and inner cladding are co-doped with for germanium and fluorine and alkali metal, institute
It is pure silicon dioxide glassy layer to state surrounding layer.Described core radius is r1, sandwich layer refractive index contrast is Δ n1, the interior bag
Layer radius is r2, refractive index contrast is Δ n2；The radius of the sagging covering is r3, refractive index contrast is Δ n3；Surrounding layer
A diameter of 125 μm, surrounding layer is pure silicon dioxide glassy layer.Bilayer polymer ultra-violet curing coating is coated outside optical fiber.Table one
The refractive index profile parameter of the be classified as preferred embodiment of the invention；Table two is special for the optical transport described in table one corresponding to optical fiber
Property.The fibre profile parameter of table one, the embodiment of the present invention
The optical fiber parameter of table two, the embodiment of the present invention
Claims (9)
1. a kind of single-mode fiber of low attenuation large effective area, includes sandwich layer and covering, it is characterised in that the half of the sandwich layer
Footpath r1For 5.4~6.5 μm, refractive index contrast Δ n1For 0.18%~0.32%, sandwich layer is coated with covering, described covering
Side includes inner cladding successively from inside to outside, sink covering and surrounding layer, the radius r of the inner cladding2For 9~13 μm, relative folding
Penetrate rate difference Δ n2For -0.10%~0.10%, the radius r of the sagging covering3For 10.5~15 μm, refractive index contrast Δ n3
For -0.60%~-0.35%；Described surrounding layer is pure silicon dioxide glassy layer.
2. the single-mode fiber of the low attenuation large effective area as described in claim 1, it is characterised in that described sandwich layer and Nei Bao
The silica glass layer that layer is co-doped with for germanium and alkali metal, or the silica glass layer that germanium fluorine and alkali metal are co-doped with, wherein alkali
Tenor is 100~500ppm.
3. the single-mode fiber of the low attenuation large effective area as described in claim 2, it is characterised in that described sagging covering is
The silica glass layer that fluorine and alkali metal are co-doped with, alkali metal content are 50~200ppm.
4. the single-mode fiber of the low attenuation large effective area as described in claim 3, it is characterised in that described alkali metal be lithium,
One or more in sodium, potassium, rubidium, caesium, francium alkali metal ion；The alkali metal concn of described sandwich layer is more than the dense of inner cladding
Degree, the alkali metal concn of inner cladding are more than covering position concentration of sinking.
5. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber exists
The effective area of 1550nm wavelength is 120~150 μm2。
6. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the stranding of the optical fiber
Cutoff wavelength is equal to or less than 1530nm.
7. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in wavelength
Dispersion at 1550nm is equal to or less than 23ps/nm*km, and dispersion of the optical fiber at wavelength 1625nm is equal to or less than
27ps/nm*km。
8. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in wavelength
Attenuation at 1550nm is equal to or less than 0.180dB/km；Attenuation at wavelength 1625nm is equal to or less than 0.200dB/km.
9. the single-mode fiber of the low attenuation large effective area as described in claim 1 or 2, it is characterised in that the optical fiber is in wavelength
Mode field diameter at 1550nm is 11.5~13 μm.
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| CN201711096647.9A CN107678088A (en) | 2017-11-09 | 2017-11-09 | The single-mode fiber of low attenuation large effective area |
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| WO2019237719A1 (en) * | 2018-06-14 | 2019-12-19 | 中天科技精密材料有限公司 | Optical fiber with high pressure resistance and low bending loss |
| CN111320376A (en) * | 2018-12-15 | 2020-06-23 | 中天科技精密材料有限公司 | Optical fiber preform and method for manufacturing the same |
| CN112897872A (en) * | 2021-01-28 | 2021-06-04 | 通鼎互联信息股份有限公司 | Manufacturing method of large mode field bending loss insensitive single mode fiber for access network |
| CN112904474A (en) * | 2021-01-27 | 2021-06-04 | 长飞光纤光缆股份有限公司 | Small-outer-diameter low-attenuation bending insensitive single-mode optical fiber |
| CN114057388A (en) * | 2020-08-05 | 2022-02-18 | 中天科技精密材料有限公司 | Method for manufacturing optical fiber preform, and optical fiber |
| CN114512885A (en) * | 2022-02-28 | 2022-05-17 | 长飞光纤光缆股份有限公司 | Rare earth-doped optical fiber with optimized back loss and preparation method thereof |
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| WO2019237719A1 (en) * | 2018-06-14 | 2019-12-19 | 中天科技精密材料有限公司 | Optical fiber with high pressure resistance and low bending loss |
| CN110609351A (en) * | 2018-06-14 | 2019-12-24 | 中天科技精密材料有限公司 | Optical fiber with high voltage resistance and low bending loss |
| CN110609351B (en) * | 2018-06-14 | 2024-10-01 | 中天科技精密材料有限公司 | Optical fiber with high voltage resistance and low bending loss |
| CN111320376A (en) * | 2018-12-15 | 2020-06-23 | 中天科技精密材料有限公司 | Optical fiber preform and method for manufacturing the same |
| CN111320376B (en) * | 2018-12-15 | 2023-09-12 | 中天科技精密材料有限公司 | Optical fiber preform and method for manufacturing the same |
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