CN104788014B - A kind of preform prepares and the method for drawing optical fibers - Google Patents
A kind of preform prepares and the method for drawing optical fibers Download PDFInfo
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- CN104788014B CN104788014B CN201510169439.1A CN201510169439A CN104788014B CN 104788014 B CN104788014 B CN 104788014B CN 201510169439 A CN201510169439 A CN 201510169439A CN 104788014 B CN104788014 B CN 104788014B
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Abstract
The present invention relates to a kind of preparation of preform and the method for drawing optical fibers.It is by the use of heating furnace device as thermal source, is configured in silica crucible container and includes core SiO2It is the rod of glass, the quartz sand compound of glass sand or the doping element such as F or B is filled into aforesaid receptacle, founds and draw out at high temperature and include core SiO at this2It is that the periphery of glass bar has SiO2The preform of the quartz sand compound surrounding layer of element such as covering or doping F or B, also can pull straight out fiber products by adjusting drawing process parameter.
Description
Technical field
The present invention relates to preform preparation and the method for drawing optical fiber.
Background technology
The production of preform at present uses two-step method more, i.e., first manufactures plug, then use different skills in mandrel outer
Art manufactures surrounding layer.Surrounding layer technology mainly has the processes such as OVD, VAD.OVD and VAD technologies need to be used in plug periphery
SiCl4Chemical vapor deposition is carried out as primary raw material and forms SOOT bodies, then in Cl2Under the conditions of be dehydrated, while generate a large amount of
HCl pernicious gases, then complete sintering and vitrifying under helium protection, and each above-mentioned link is required in technique respectively
Carried out in device, therefore prefabricated rods preparation mainstream technology complexity is higher, it is very severe to device, technique and environmental requirement
Carve, process costs, maintenance cost and environmental protection treatment cost are high.
By the existing many reports of the method for pulling optical fiber preform, though being not quite similar on process detail, typically all need
The prefabricated rods prepared are dismantled and cooled down, is transferred on drawing optical fibers tower apparatus and carries out ressembling fixation, after heating again
It is larger that process, complex technical process, the process parameter control difficulty such as melting and wire drawing could be completed.Seldom see in same work
It can be had concurrently on process and equipment and realize that prefabricated rods prepare and prepared without prefabricated rods the relevant technique side for directly carrying out drawing optical fibers
The report of method, the invention of this process can farthest reduce process procedure, reduce production cost, lift market competition
Power.
The content of the invention
The purpose of the present invention is a kind of advanced technology of invention, technological flexibility is high, properties of product are excellent, cost advantage is obvious
Process, you can once property completion prepares surrounding layer so as to prepare high-purity, low hydroxyl on a process unit
Preform, it can be also done directly by adjusting process parameter on same process unit without prefabricated rods preparation process
Fiber draw process, obtain a diameter of 124 μm~125 μm of bare fibre.
A kind of preform provided by the invention prepares and the method for drawing optical fibers, as shown in figure 1, including following step
Suddenly：
(1) electric heating furnace device is used as thermal source, is configured in high purity quartz tubular container and is included core SiO2It is glass
Rod, welding are put into quartz ampoule and keep coaxially, installing at top with quartz sand vertically being fixed after rod by assembling
The refractory seal device of material mouth and vacuum orifice, quartz sand feed opening is closed, is evacuated to 4~9mbar.
(2) quartz sand blanking device is opened, by the glass sand material of more than 99.999% purity of the mesh of 100 mesh~300
Predetermined altitude 200-400mm in foregoing quartzy tubular container is inserted, predetermined altitude determines according to prefabricated rods specification and technological parameter, opens
Beginning heating is founded, and glass melting temperature is that the temperature of quartzy tube outer surface is 1100 DEG C~2200 DEG C, and vacuum is 30~200mbar,
Kept for 2~4 hours, quartz material in container is reached the state melted completely.
(3) start to draw prefabricated rods, be passed through nitrogen protective gas and keep the temperature at 1720 DEG C~2000 DEG C, opening stove
Mouth under body, the vitreum melted is clamped with draw-gear, it is 10~20mm/min to control hauling speed, is drawn out in the bag
SiO containing core2It is that the periphery of glass bar has SiO2The preform of covering.
In above-mentioned steps (1), quartz sand material is alternatively the quartz sand mixing of the elements such as concentration 200-2000ppm doping F or B
Material, heating furnace device is using sensing medium, high frequency stove or resistance furnace, core SiO2It is that glass bar is adulterated using a variety of different interlayers
Structure design.
In above-mentioned steps (2), quartz sand charging uses automation control system, with quartz sand surface height in container
Constantly decline, the meeting auto feed of quartz sand charging system makes quartz sand charge level stop charging after reaching initial setting up height, so
Repeatedly until adding precalculated quartz material.
In above-mentioned steps (3), drawing process parameter is also can adjust, pulls straight out fiber products, wherein temperature is 2000 DEG C
~2200 DEG C, 1300~1700m/min of hauling speed, and the data feedback by calibrating instrument is finely adjusted, to ensure naked light
Fine diameter control is at 124 μm~122 μm.
Technological parameter in above steps is all by engineer testing many times and properties of product Comprehensive Correlation and is divided
What analysis was summarized and obtained, various process parameters must be strictly controlled in actual mechanical process, just quartz powder materials can be made to reach preferable
Melting quality, and then the performance indications such as prefabricated rods and fibre-optic waveguide structure, physical dimension, outward appearance for ensureing to draw out reach standard
It is required that if control is bad or unstable, the defects of inevitably resulting in properties of product, or even as waste product.
The present invention use a process unit, disposable to complete preparation prefabricated rods surrounding layer so as to prepare high-purity, low
The preform of hydroxyl, and can be done directly fiber draw process by adjusting process parameter on same process unit, be
A kind of advanced technology, technological flexibility are high, properties of product are excellent, cost advantage obviously process.Specifically, originally
Prepared by the preform of invention and the process of drawing optical fibers has following advantages：
1. same process unit realizes prefabricated rods preparation and two kinds of functions of drawing optical fibers, integrated technology is advanced, technique spirit
It is active high, while the consumption of the energy and raw material is reduced, farthest reduce comprehensive production cost；
2. glass melting temperature be the temperature control of quartzy tube outer surface at 1800 DEG C~2500 DEG C, vacuum is 30~
200mbar, quartz powder materials Task-size Controlling scope are the mesh of 100 mesh~300, can abundant fused quartz raw material, make made from it is prefabricated
Rod and fiber products do not have bubble substantially；
3. being founded in closed quartz ampoule, pollution of the external environment to quartz material, prepared prefabricated rods outsourcing are avoided
Layer purity is high, meets requirement prepared by optical fiber；
4. using induction furnace or resistance furnace apparatus, the quartz glass founded has the characteristics of low hydroxyl for thermal source, without de-
Hydroxyl directly reaches 4ppm~10ppm LWPF standard.
The optical fiber prefabricating rod product and drawing optical fibers product technology of preparing of the present invention is a kind of advanced technology, technological flexibility
It is high, properties of product are excellent, the obvious process of cost advantage, the preform and drawing optical fibers product of production have high-purity
Degree, the performance characteristics of low hydroxyl, it can be applied to preform manufacture and drawing optical fibers high-tech sector.The predispersed fiber of the present invention
Rod processed prepares and the Integrated comparative situation of the process of drawing optical fibers and main flow OVD and VAD technology, is shown in Table 1.
The Comprehensive Correlation table of the inventive method of table 1 and main flow OVD and VAD technology
Brief description of the drawings
The prefabricated rods that Fig. 1 is the present invention prepare and drawing optical fibers process schematic representation
Fig. 2 is the core SiO that the present invention uses2It is the schematic diagram of an example of glass bar cross section structure
Fig. 3 is the core SiO that the present invention uses2It is the two of the individual illustration intention of glass bar cross section structure
Fig. 4 is the core SiO that the present invention uses2It is the three of the individual illustration intention of glass bar cross section structure
Mark content as follows in each accompanying drawing：
In Fig. 1：
1-vacuum pump set, 2-vacuum suction, 3-device for positioning and securing of pipeline
4-high purity quartz pipe 5-plug, 6-quartz sand
9-draw-gear of 7-electric smelting furnace apparatus, 8-prefabricated rods or optical fiber
10-tremie pipe, 11-blanking machine 12-etc. pressure chamber
In Fig. 2：
1a1- multimode sandwich layer 1b1- multimode inner cladding n1The refractive index n of-multimode sandwich layer2The folding of-multimode inner cladding
Penetrate rate
In Fig. 3：
1a2- single mode sandwich layer 1b2- single mode inner cladding n1The refractive index n of-single mode sandwich layer2The folding of-single mode inner cladding
Penetrate rate)
In Fig. 4：
1a3- pure SiO2Sandwich layer 1b3- doping F or B element SiO2Covering n1- pure SiO2The refractive index n of sandwich layer2—
Adulterate the F or SiO of B element2The refractive index of optics covering
Embodiment：
Below in conjunction with the accompanying drawings 1, the embodiment of the present invention is more fully described.
The present invention is prepared prefabricated rods using same process unit and two kinds of functions of drawing optical fibers are integrated in one.
High purity quartz is put into as shown in figure 1, plug 5 is welded and assembles fixation by device for positioning and securing 3 after a rod vertically
In pipe 4 and keep coaxial, installed at the top of quartz ampoule and carry quartz sand tremie pipe 10 and vacuum lead 2, tremie pipe is with placing
Blanking machine 11 in the pressure chamber 12 such as closed is connected, and vacuum suction pipeline is connected with vacuum pump set 1, starts automatically controlling for blanking machine
Blanking system, glass sand 6 is added in quartz ampoule, opens vacuum pump set, to quartz ampoule inside and etc. pressure chamber take out it is true
Sky, and the pressure chamber such as guarantee, with isobaric inside quartz ampoule, the heating system for connecting electric smelting furnace apparatus 7 starts to found, and nitrogen is passed through in stove
Gas or other protective gas, certain temperature, vacuum are kept, quartz material in container is reached the state melted completely.With
Draw-gear 9 clamps the vitreum melted, and preform or optical fiber 8 are drawn out by adjusting hauling speed.
Example 1：Electric heating furnace device is used as thermal source, is configured in quartz ampoule and includes core SiO2It is glass bar (section
Structure such as Fig. 2,1a1- multimode sandwich layer, n1The refractive index of-multimode sandwich layer, 1b1- multi-mode optical covering, n2- multi-mode optical bag
The refractive index of layer), length 1000mm, diameter 50mm, welding is fixed being put into quartz ampoule and keep vertically by assembling after rod
Coaxially, quartz ampoule height 1200mm, diameter 120mm, wall thickness 5mm, install with quartz sand feed opening and vacuumize at top
The refractory seal device of mouth, quartz sand feed opening is closed, is evacuated to 4mbar.
Start quartz sand automatic blanking system, the quartz sand material of more than 99.999% purity of the mesh of 100 mesh~300 is inserted
Predetermined altitude 200mm in foregoing quartzy tubular container, begins to warm up and founds, and glass melting temperature is that the temperature of quartzy tube outer surface is 1800
DEG C, vacuum 30mbar, kept for 2 hours, quartz material in container is reached the state melted completely.
Start to draw prefabricated rods, be passed through nitrogen protective gas and in-furnace temperature is maintained at 1720 DEG C, open mouth under body of heater,
Clamp the vitreum melted with draw-gear, while automatic blanking device continues to quartz sand charge level in preset height,
Terminate until drawing, it is 50mm/min to control hauling speed, draws out and includes core SiO at this2It is that the periphery of glass bar has
SiO2The preform of covering.
The length of described optical fiber prefabricating rod product is 970mm, a diameter of 90mm.Hydroxy radical content 13ppm, outward appearance is without gas
Bubble, gas line, have preferable combination property, are drawn available for multimode fibre.
Example 2：Heating furnace device is used as thermal source, is configured in quartzy tubular container and includes core SiO2It is that glass bar (is cut
Face structure such as Fig. 3,1a2- single mode sandwich layer, n1The refractive index of-single mode sandwich layer, 1b2- single-mode optical covering, n2- single-mode optical
The refractive index of covering), length 1500mm, diameter 40mm, welding is fixed being put into quartz ampoule and protect vertically by assembling after rod
Coaxial, quartz ampoule height 1700mm, diameter 210mm, wall thickness 5mm are held, installs with quartz sand feed opening and takes out true at top
The refractory seal device eated dishes without rice or wine, quartz sand feed opening is closed, is evacuated to 9mbar.
Start quartz sand automatic blanking system, the quartz sand material of more than 99.999% purity of the mesh of 100 mesh~300 is inserted
Predetermined altitude 400mm in foregoing quartzy tubular container, begins to warm up and founds, and glass melting temperature is that the temperature of quartzy tube outer surface is 1850
DEG C, vacuum 50mbar, kept for 3.5 hours, quartz material in container is reached the state melted completely.
Start to draw prefabricated rods, be passed through nitrogen protective gas and keep the temperature at 1120 DEG C, open mouth under body of heater, with leading
Leading-in device clamps the vitreum melted, while automatic blanking device continues to quartz sand charge level in preset height, until
Drawing terminates, and it is 10mm/min to control hauling speed, draws out and includes core SiO at this2It is that the periphery of glass bar has SiO2Bag
The preform of layer.
The length of described optical fiber prefabricating rod product is 1500mm, a diameter of 150mm.Hydroxy radical content 4ppm, outward appearance is without gas
Bubble, gas line, have preferable combination property, are drawn available for single-mode fiber.
Example 3：Heating furnace device is used as thermal source, core SiO is configured in quartzy tubular container2Glass bar (cross section structure
Such as Fig. 4,1a3- pure SiO2Sandwich layer, n1- pure SiO2The refractive index of sandwich layer, 1b3- doping F SiO2Optics covering, n2- doping F
SiO2The refractive index of optics covering), length 1500mm, diameter 10mm, welding after rod by assembling fix be put into stone vertically
In English pipe and keep coaxial, quartz ampoule height 700mm, diameter 170mm, wall thickness 5mm, installed at top with quartz sand blanking
The high temperature resistant vacuum stopper of mouth and vacuum orifice, quartz sand feed opening is closed, is evacuated to 7mbar.
Start quartz sand automatic blanking system, the doping F element quartz sand compounds of the mesh of 100 mesh -300 are inserted into foregoing stone
Predetermined altitude 300mm, begins to warm up and founds in English tubular container, and glass melting temperature is that the temperature of quartzy tube outer surface is 2500 DEG C, very
Reciprocal of duty cycle is 80mbar, is kept for 3 hours, quartz material in container is reached the state melted completely.
Start to draw prefabricated rods, be passed through nitrogen protective gas and keep the temperature at 2000 DEG C, open mouth under body of heater, with leading
Leading-in device clamps the vitreum melted, while automatic blanking device continues to quartz sand charge level in preset height, until
Drawing terminates, and it is 20mm/min to control hauling speed, draws out and includes core SiO at this2Be glass bar periphery have doping F
Elements Si O2The preform of covering.
The length of described optical fiber prefabricating rod product is 1470mm, a diameter of 122mm.Hydroxy radical content 4ppm, outward appearance is without gas
Bubble, gas line, have preferable combination property.
Example 4：：Heating furnace device is used as thermal source, is configured in quartz ampoule and includes core SiO2It is that glass bar (is tied in section
Structure such as Fig. 2,1a1- multimode sandwich layer, n1The refractive index of-multimode sandwich layer, 1b1- multi-mode optical covering, n2- multi-mode optical covering
Refractive index), length 1000mm, diameter 50mm, welding fixed being put into quartz ampoule by assembling after rod and keep same vertically
Axle, quartz ampoule height 1200mm, diameter 120mm, wall thickness 5mm, is installed with quartz sand feed opening and vacuum orifice at top
Refractory seal device, close quartz sand feed opening, be evacuated to 5mbar.
Start quartz sand automatic blanking system, the quartz sand material of more than 99.999% purity of the mesh of 100 mesh~300 is inserted
Predetermined altitude 200mm in foregoing quartzy tubular container, begins to warm up and founds, and glass melting temperature is that the temperature of quartzy tube outer surface is 2000
DEG C, vacuum 100mbar, kept for 3.7 hours, quartz material in container is reached the state melted completely.
Start drawing optical fiber, be passed through nitrogen protective gas and keep the temperature at 1900 DEG C, mouth under body of heater is opened, with traction
Device clamps the vitreum melted, while automatic blanking device continues to quartz sand charge level in preset height, Zhi Daola
System terminates, and it is 1300m/min to control hauling speed, draws out 124.5 μm of fibre diameter.Gained optical fiber is in 1530- after tested
Loss is 0.197db/km at 1565nm wave-length coverages, meets the requirement of multimode fibre standard.
Example 5：Heating furnace device is used as thermal source, is configured in quartzy tubular container and includes core SiO2It is that glass bar (is cut
Face structure such as Fig. 3,1a2- single mode sandwich layer, n1The refractive index of-single mode sandwich layer, 1b2- single-mode optical covering, n2- single-mode optical
The refractive index of covering), length 1500mm, diameter 40mm, welding is fixed being put into quartz ampoule and protect vertically by assembling after rod
Coaxial, quartz ampoule height 1700mm, diameter 210mm, wall thickness 5mm are held, installs with quartz sand feed opening and takes out true at top
The high temperature resistant vacuum stopper eated dishes without rice or wine, quartz sand feed opening is closed, is evacuated to 7mbar.
Start quartz sand automatic blanking system, the quartz sand material of more than 99.999% purity of the mesh of 100 mesh -300 is inserted
Predetermined altitude 400mm in foregoing quartzy tubular container, begins to warm up and founds, and glass melting temperature is that the temperature of quartzy tube outer surface is 1850
DEG C, vacuum 90mbar, kept for 4 hours, quartz material in container is reached the state melted completely.
Start drawing optical fiber, be passed through nitrogen protective gas and keep the temperature at 2000 DEG C, mouth under body of heater is opened, with traction
Device clamps the vitreum melted, while automatic blanking device continues to quartz sand charge level in preset height, Zhi Daola
System terminates, and it is 1700m/min to control hauling speed, draws out 125 μm of fibre diameter.Gained optical fiber is in 1310nm wavelength after tested
Loss is 0.33db/km at scope, and loss is 0.187db/km at 1550nm wave-length coverages, meets that single-mode fiber standard will
Ask.
Example 6：Heating furnace device is used as thermal source, core high-purity sio2 glass bar (section is configured in quartzy tubular container
Structure such as Fig. 4,1a3- pure SiO2Sandwich layer, n1- pure SiO2The refractive index of sandwich layer, 1b3The SiO of-doping B element2Optics covering,
n2The SiO of-doping B element2The refractive index of optics covering), length 500mm, diameter 10mm, weld and fixed assembling is passed through after rod
It is vertical to be put into quartz ampoule and keep coaxial, quartz ampoule height 700mm, diameter 170mm, wall thickness 5mm, install and carry at top
The high temperature resistant vacuum stopper of quartz sand feed opening and vacuum orifice, quartz sand feed opening is closed, is evacuated to 6mbar.
Start quartz sand automatic blanking system, the concentration 200-2000ppm of the mesh of 100 mesh -300 is adulterated into F or the stone of B element
Sand compound inserts predetermined altitude 300mm in foregoing quartzy tubular container, begins to warm up and founds, and glass melting temperature is quartz ampoule appearance
The temperature in face is 1750 DEG C, vacuum 70mbar, is kept for 3.6 hours, quartz material in container is reached the state melted completely.
Start drawing optical fiber, be passed through nitrogen protective gas and keep the temperature at 2200 DEG C, mouth under body of heater is opened, with traction
Device clamps the vitreum melted, while automatic blanking device continues to quartz sand charge level in preset height, Zhi Daola
System terminates, and it is 1600m/min to control hauling speed, draws out 124 μm of fibre diameter.Gained optical fiber is in 1310nm wavelength after tested
Loss is 0.313db/km at scope, and loss is 0.179db/km at 1550nm wave-length coverages, meets that single-mode fiber standard will
Ask.
The present invention is not limited to above-described embodiment.Such as used include core SiO2It is the rod of glass, though in instances
The design of a few interlayer doped structure is only listed, but actually the scope of application is very wide, it is various to be designed through overdoping and refractive index
Prepared by for the plug of multimode or single mode all can with the present invention method carry out pure SiO2Or doping concentration is 200-
The preparation of the quartz sand compound surrounding layer of the elements such as 2000ppm F or B, so as to prepare preform or directly draw out
Optical fiber.In addition, according to mandrel structure and the difference of diameter or the difference of drawing optical fiber preform diameter, to quartzy pipe size, stove
The parameters such as temperature, vacuum, draw rate strictly control and adjust, so as to obtain the higher prefabricated rods of yield rate and optical fiber production
Product.Temperature parameter in technique can be measured by infrared ray sensor etc., and the diameter of prefabricated rods and optical fiber, which can use, to swash
Device etc. is measured after measured outside light.
Claims (2)
1. a kind of preform prepares and the method for drawing optical fibers, it is characterised in that the once property on same process unit
Completion prepares surrounding layer so as to prepare high-purity, the preform of low hydroxyl or directly complete without prefabricated rods preparation process
Into fiber draw process, comprise the following steps：
(1) heating furnace device is used as thermal source, is configured in quartzy tubular container and is included core SiO2It is the rod of glass, passes through positioning
Fixing device (3) assembling is fixed to be made glass plug be put into vertically in quartz ampoule and keeps coaxial, and at top, installation carries quartz sand
Tremie pipe (10) and vacuum lead (2), tremie pipe are connected with placing the blanking machine (11) in the pressure chamber (12) such as closed, and vacuum is taken out
Feed channel is connected with vacuum pump set (1), and 4~9mbar is evacuated to before charging；Heating furnace device uses induction furnace or resistance furnace；
Core SiO2It is the design structure that glass bar uses a variety of different index distributions；
(2) the quartz sand material of more than 99.999% purity of the mesh of 100 mesh~300 is inserted into foregoing quartzy tubular container predetermined altitude
200-400mm, predetermined altitude determines according to prefabricated rods specification and technological parameter, begins to warm up and founds, glass melting temperature is quartz ampoule
The temperature of outer surface is 1800 DEG C~2500 DEG C, and vacuum is 30~100mbar, preheats 2-4 hours, makes quartz material in high-temperature region
Reach the state melted completely；
Quartz sand charging uses automation control system, with the continuous decline of quartz sand upper level in container, quartz sand
Charging system meeting auto feed makes quartz sand charge level maintain default setting height, so repeatedly precalculated until adding
Quartz material, drawing terminate；
(3) start to draw prefabricated rods, be passed through nitrogen protective gas and keep the temperature at 1720 DEG C~2000 DEG C, open under body of heater
Mouthful, the vitreum melted is clamped with draw-gear, it is 10~20mm/min to control hauling speed, draws out and includes core at this
Use SiO2It is that the periphery of glass bar has SiO2The preform of covering, prefabricated rods without dehydroxylation directly reach 4ppm~
10ppm low hydroxy radical content；
Or adjustment drawing process parameter, fiber products are pulled straight out, wherein temperature is 2000 DEG C~2200 DEG C, hauling speed
1300~1700m/min, bare-fiber diameter are controlled at 124 μm~125 μm.
2. method according to claim 1, it is characterised in that：In the step (2), quartz sand material changes concentration 200- into
5000ppm doping F quartz sand compound or the quartz sand compound for adulterating B element.
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| CN107098578B (en) * | 2017-04-27 | 2019-06-25 | 烽火通信科技股份有限公司 | Method for manufacturing the preform of multilayered structure optical fiber and manufacturing optical fiber |
| CN107082559B (en) * | 2017-05-10 | 2019-08-13 | 烽火通信科技股份有限公司 | The method for fast mfg of optical fiber |
| CN109482421A (en) * | 2018-11-30 | 2019-03-19 | 中国工程物理研究院激光聚变研究中心 | Metal coating on optical fiber coating unit and metal coating on optical fiber coating method |
| CN111233316A (en) * | 2020-04-16 | 2020-06-05 | 山东华光信息科技有限公司 | Optical fiber preform fusion forming method and manufacturing equipment thereof |
| CN112279504B (en) * | 2020-11-30 | 2023-09-26 | 江苏亨通光导新材料有限公司 | Preparation device and preparation method of optical fiber preform |
| CN117567020B (en) * | 2024-01-15 | 2024-04-30 | 武汉长进光子技术股份有限公司 | Batch preparation method, online marking method, device and medium for tapered optical fibers |
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| AU5316699A (en) * | 1998-08-25 | 2000-03-14 | Corning Incorporated | Methods and apparatus for producing optical fiber |
| US8132429B2 (en) * | 2004-04-27 | 2012-03-13 | Silitec Fibers Sa | Method for fabricating an optical fiber, preform for fabricating an optical fiber, optical fiber and apparatus |
| EP1942083A1 (en) * | 2006-12-07 | 2008-07-09 | Datwyler Fiber Optics S.A. | Method and apparatus for fabricating a preform for an active optical fiber, active optical fiber and amplifier |
| CN101186435A (en) * | 2007-12-06 | 2008-05-28 | 南开大学 | Method for fabricating optical fibre prefabricated rod |
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Effective date of registration: 20190402 Address after: 065001 No. 85 Huaxiang Road, Langfang Economic and Technological Development Zone, Hebei Province Co-patentee after: Tianjin Futong Xinmao Science and Technology Co., Ltd. Patentee after: Quick Gem Optoelectronics S& T Co., Ltd. Address before: 065001 No. 85 Huaxiang Road, Langfang Economic and Technological Development Zone, Hebei Province Patentee before: Quick Gem Optoelectronics S& T Co., Ltd. |
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Address after: 065001 Huaxiang Road, Langfang Development Zone, Langfang City, Hebei Province Patentee after: QUICK GEM OPTOELECTRONIC S & T Co.,Ltd. Patentee after: Tianjin Futong Information Technology Co.,Ltd. Address before: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang No. 85 Patentee before: QUICK GEM OPTOELECTRONIC S & T Co.,Ltd. Patentee before: TIANJIN FUTONG XINMAO SCIENCE & TECHNOLOGY Co.,Ltd. |