CN202912848U - Device for manufacturing large-size bend insensitive fiber preform rod - Google Patents

Device for manufacturing large-size bend insensitive fiber preform rod Download PDF

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Publication number
CN202912848U
CN202912848U CN 201220341489 CN201220341489U CN202912848U CN 202912848 U CN202912848 U CN 202912848U CN 201220341489 CN201220341489 CN 201220341489 CN 201220341489 U CN201220341489 U CN 201220341489U CN 202912848 U CN202912848 U CN 202912848U
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China
Prior art keywords
sandwich layer
blowtorch
inner cladding
plug
layer
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CN 201220341489
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Chinese (zh)
Inventor
钱建林
孙贵林
马建强
肖华
孙国锋
钮晓平
沈振兴
李晓东
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Hengtong Optic Electric Co Ltd
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Jiangsu Hengtong Optic Electric Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/23—Double or multiple optical cladding profiles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/50—Cooling the drawn fibre using liquid coolant prior to coating, e.g. indirect cooling via cooling jacket

Abstract

The utility model provides a device for manufacturing a large-size bend insensitive fiber preform rod. The device comprises deposition equipment and sintering equipment, wherein the deposition equipment comprises a core layer blow lamp, a core layer inner cladding blow lamp and a core layer outer cladding blow lamp and is used for depositing an initial target rod into a core rod loose body, wherein the core rod loose body comprises a core layer, a core layer inner cladding layer and a core layer inner cladding layer; the sintering equipment comprises a heating furnace, a furnace core tube, a gas inlet and a gas outlet, wherein the heating furnace is placed in the middle of the outer side of the furnace core tube; the gas inlet is positioned at the upper end of the furnace core tube; the gas outlet is positioned at the lower end of the furnace core tube; the sintering equipment is used for sintering the core rod loose body into a glass core rod with the inner cladding layer; the outer cladding layer is deposited on the prepared glass core rod and then the glass core rod is dehydrated and sintered into a transparent fiber preform rod; or the prepared glass core rod is inserted into a pure quartz sleeve so as to obtain the assembled fiber preform rod.

Description

A kind of device of making large size bend insensitive fiber prefabricated rods
Technical field
The utility model relates to a kind of device of making large size bend insensitive fiber prefabricated rods.
Background technology
Along with further popularizing of internet and mobile Internet, video and other bandwidth applications all have huge promoter action to the broadband network development that comprises WiMAX, and market is to the demand sustainable growth of broadband network.Under the substantially ready background of fiber backbone network construction, the demand of building for satisfying broadband market and 3G, in recent years, operation commercial city focusing on optical fiber Metropolitan Area Network (MAN) and the Optical Access Network the fiber optic network construction.Operator also releases the broadband development strategy of oneself one after another, carry forward vigorously the construction of FTTx, this has driven the sustainable growth of China's optical fiber cable demand on the one hand, also the optical fiber cable performance is had higher requirement on the other hand, market is continuous growing trend to the demand of the novel optical fiber of suitable Metropolitan Area Network (MAN) and connecting network development.
The bend insensitive fiber optical cable requires to have the transport property different from common G.652 optical fiber, special requirement optical fiber under minimum bending radius, the performance that the added losses of generation are very little.The report that is entitled as " FTTH is in global technology and market development " that market survey mechanism delivered before Heavy Reading day is estimated, will realize FTTH to the families in 2012 global 5%, and the FTTH total number of users is expected to increase to 9,000 ten thousand from 2,000 ten thousand.
For single-mode fiber, mode field diameter and cutoff wavelength play a major role to the macrobending loss of optical fiber, can weigh with the MAC value bending property of optical fiber, and wherein: MAC is defined as the ratio of mode field diameter and cutoff wavelength.MAC is less, and then the bend-insensitive performance of optical fiber is better.Obviously, reduce mode field diameter, increase the purpose that cutoff wavelength can reach reduction MAC, thus need to make balance in mode field diameter and two parameters of cutoff wavelength, to satisfy the actual needs that use.Studies show that, adopt the waveguiding structure of the sagging type of double clad to design (Fig. 1) can improve optical fiber when reducing fiber cut off wavelength bend-insensitive performance, and opticator can keep the G.652 design of optical fiber, thereby is the more excellent waveguiding structure design of current G.657 optical fiber.
Domestic patent of invention ZL200410061392.9 discloses a kind of bend insensitive fiber and preparation method thereof, adopt PCVD technique to prepare preform, but its processing requirement need be made respectively five coverings, therefore refractive index profile is difficult to control, and in molten compression process, need pass into the destruction arch-criminal Freon gas of atmospheric ozone layer, be under an embargo at present and produced and use, adopted simultaneously the preform size of PCVD technique preparation less, wire drawing efficient is lower.Domestic patent of invention ZL200910062855.6 discloses a kind of single-mode fiber and manufacture method thereof, just mentioned a kind of method of design of bend insensitive fiber, and specifically do not mention the manufacture method of preform, it is higher that it makes excellent processing requirement, is difficult to carry out in the actual production process.
The utility model content
The utility model provides a kind of device of making large size bend insensitive fiber prefabricated rods, this device comprises depositing device, agglomerating plant, depositing device comprises sandwich layer blowtorch, sandwich layer inner cladding blowtorch, sandwich layer surrounding layer blowtorch, be used for the primary target rod is deposited as the plug loose media, wherein the plug loose media comprises sandwich layer, sandwich layer inner cladding, sandwich layer surrounding layer; Agglomerating plant comprises process furnace, inlet mouth and venting port, is used for the plug loose media is sintered to the glass plug with inner cladding; To the glass plug of above-mentioned preparation deposition surrounding layer, sinter transparent preform into by dehydration again, perhaps the glass plug of above-mentioned preparation is inserted in the pure quartz socket tube and assemble preform.
Further, described sandwich layer is controlled its refractive index contrast Δ by mixing germanium 1Between 0.41% ~ 0.50%; Described sandwich layer inner cladding is controlled its refractive index contrast Δ by mixing germanium in deposition process 2Between 0.25% ~ 0.35%; Described sandwich layer surrounding layer is to control its refractive index contrast Δ 3 between-0.05% ~-0.20% by mixing fluorine in deposition process; Described inner cladding is to mix fluorine to control its refractive index contrast Δ 4 between-0.02% ~-0.07% in the dehydration sintering process; Described surrounding layer is pure SiO2 glass.
Further, described sandwich layer blowtorch is with the SiO that generates 2And GeO 2Particulate is delivered to by flame near the end face of primary target rod, finally is deposited on the primary target plane rod end, forms thus the sandwich layer of plug loose media.
Further, the sandwich layer inner cladding in the described plug loose media also is that sandwich layer inner cladding blowtorch is with the SiO that generates 2And GeO 2Particulate is delivered to by flame near the sandwich layer end face, finally is deposited on the SiO that the one deck that forms on the sandwich layer end face is mixed germanium 2Loosening body.
Further, the sandwich layer surrounding layer in the described plug loose media is that sandwich layer surrounding layer blowtorch is by doping CF 4SiCl 4Generation is mixed the SiO of fluorine 2Particle deposition is on sandwich layer inner cladding surface and the loosening body that forms.
Further, in depositing device, the primary target rod is slowly promoted and uniform rotation by servomotor, promotes speed corresponding with sedimentation rate, and the rotating speed of servomotor is 25 rev/mins, and speed-raising is 0.85 mm/min.
Adopt the preform of this utility model device preparation, adopt deposition, sintering to reduce step by step the technique of specific refractory power, finished the design of the sagging type refractive index profile of double clad.Its producing apparatus, production technique advantages of simple, preparation cost and risk drop to minimum, the optical fiber of producing, parameter meets G.657 standard of ITU-T fully, have excellent bend-insensitive and the characteristic of low water peak absorption loss concurrently, and have low splice loss, splice attenuation and reliable mechanical property during with the conventional fiber welding.
Description of drawings
Fig. 1 is the preform structural design drawing of the sagging type of double clad of the present utility model, and wherein, 1 is sandwich layer, and 2 is the sandwich layer inner cladding, and 3 is the sandwich layer surrounding layer, and 4 is inner cladding, and 5 is pure SiO 2Surrounding layer.
Fig. 2 is depositing device figure of the present utility model, and wherein, 6 is the sandwich layer blowtorch, and 7 is sandwich layer inner cladding blowtorch, and 8 is sandwich layer surrounding layer blowtorch, and 9 is the plug loose media.
Fig. 3 is agglomerating plant figure of the present utility model, and wherein, 10 is furnace core tube, and 11 is process furnace, and 12 is the glass plug, and 13 is inlet mouth, and 14 is venting port.
Embodiment
Below in conjunction with Figure of description and embodiment the utility model is described further.
The purpose of this utility model provides a kind of device of making large size bend insensitive fiber prefabricated rods.
The utility model provides a kind of preparation facilities of novel large size bend insensitive fiber prefabricated rods, adopt two sagging surrounding layer designs, its preparation technology is simple, the material the Nomenclature Composition and Structure of Complexes is reasonable in design, when guaranteeing excellent bend-insensitive performance, have simultaneously very high mechanical reliability, improved bend-insensitive performance and the work-ing life thereof of optical fiber.
For conveniently introducing the utility model content, the definitional part term:
Preform: the mother metal of preparation optical fiber, the radial refractive index distribution that is comprised of sandwich layer and covering meets glass stick or the molectron that optical fiber designs requires directly to be drawn into design optical fiber.
Plug loose media: the vitreum that contains sandwich layer or part covering.
Refractive index profile: the relation between optical fiber or preform glass refraction and its radius.
Refractive index contrast:
Figure 989005DEST_PATH_IMAGE001
, n wherein iAnd n oThe glass refraction of the corresponding optical fiber of difference or preform each several part (each several part refers to each layer that forms prefabricated rods, sandwich layer, sandwich layer inner cladding, sandwich layer surrounding layer, inner cladding) and pure silicon dioxide (being surrounding layer).The n in the formula when calculating the refractive index contrast of sandwich layer for example iBe the glass refraction of sandwich layer, n oBe the glass refraction of surrounding layer.
Sleeve pipe: the cylindrical pure quartz glass tube with certain geometry and internal-and external diameter requirement.
VAD(Vapor Phase Axial Deposition) loose media depositing operation: adopt vapour phase axial deposition technique, (the glass loose media is the predecessor of glass plug to prepare the designed glass loose media with sandwich layer and part covering, also can be called the plug loose media, it will become transparent glass plug after by sintering).
RIC(Rod In Cylinder) technique: the manufacturing process of the glass plug being inserted the large-scale optical fiber prefabricating stick that forms in the sleeve pipe.
OVD(Outside Vapor Deposition) surrounding layer depositing operation: have certain thickness pure silicon dioxide glass loose media (being surrounding layer) in the mandrel surface preparation with outside vapour deposition process and sintering process.
Sintering: the loose media that adopts above-mentioned VAD deposition or the surrounding layer that adopts OVD epiboly deposition are carried out the real process of heat burning.
Regulate the method for specific refractory power: common doped with Ge O 2And P 2O 5Help the increase of specific refractory power, doped with fluorine and boron can reduce specific refractory power, and this class material is at SiO 2In the glass with SiO 2Form solid phase solution, thereby change SiO 2Specific refractory power.
The preparation scheme of the utility model preform is:
Preform forms and is comprised of sandwich layer, sandwich layer inner cladding, sandwich layer surrounding layer, inner cladding, pure silicon dioxide covering successively, and described sandwich layer is controlled its refractive index contrast Δ by mixing germanium (Ge) 1Between 0.41% ~ 0.50%.Described sandwich layer inner cladding is controlled its refractive index contrast Δ by mixing germanium (Ge) in deposition process 2Between 0.25% ~ 0.35%.Described sandwich layer surrounding layer is to control its refractive index contrast Δ 3 between-0.05% ~-0.20% by mixing fluorine (F) in deposition process.Described inner cladding is to mix fluorine to control its refractive index contrast Δ 4 between-0.02% ~-0.07% in the dehydration sintering process.Described surrounding layer is pure SiO 2Glass.
Employing VAD(vapour phase axial deposition technique) method is made preform, deposition corresponding to the plug loose media is to produce in an independent operation, flame hydrolysis occurs in the unstripped gas of blowtorch ejection immediately when deposition plug loose media, and reaction equation is as follows:
SiCl 4 + 2H 2 + O 2 → SiO 2 + 4HCl ——1
GeCl 4 + 2H 2 + O 2 → GeO 2 + 4HCl ——2
Above-mentioned blowtorch can select silica glass, pottery or metallic substance to make, and profile is that square, oval or circular porous or multilayer material consists of.Blowtorch quantity is 3, and the porous on the blowtorch or multilevel access comprise inflammable gas runner, combustion-supporting gas runner, unstripped gas runner, impurity gas runner, and gas flow corresponding to each blowtorch all points to the same point on the plug axis.
1, the forming process of sandwich layer 1, sandwich layer inner cladding 2 and sandwich layer surrounding layer 3 (process that namely prepares the plug loose media)
Sandwich layer in the plug loose media is that sandwich layer blowtorch 6 in the depositing device is by above-mentioned reaction 1 and 2, the SiO of generation 2And GeO 2Particulate is delivered to by flame near the end face of primary target rod, finally is deposited on the primary target plane rod end, forms thus the sandwich layer 1 of plug loose media.Sandwich layer inner cladding 2 in the described plug loose media also is the sandwich layer inner cladding blowtorch 7 process above-mentioned reactions 1 and 2 in the depositing device, the SiO of generation 2And GeO 2Particulate is delivered to by flame near the sandwich layer end face, finally is deposited on the SiO that the one deck that forms on the sandwich layer end face is mixed germanium (Ge) 2Loosening body, both differences are GeO 2The impurity gas flow velocity is different, and the latter is less than the former.Sandwich layer surrounding layer 3 in the described plug loose media is that sandwich layer surrounding layer blowtorch 8 in the depositing device is by doping CF 4SiCl 4The SiO of fluorine (F) is mixed in 1 generation that reacts 2Particle deposition is on sandwich layer inner cladding surface and the loosening body that forms.By the structure of choose reasonable blowtorch, distance and depositing temperature and flow between blowtorch, the refractive index contrast of control sandwich layer is controlled between 0.41% ~ 0.50%, the refractive index contrast of sandwich layer inner cladding is controlled between 0.25% ~ 0.35%, and the refractive index contrast of sandwich layer surrounding layer is controlled between-0.05% ~-0.20%.Gas flow is conventional the setting, does not do description at this.The primary target rod is slowly promoted and uniform rotation by servomotor, promotes speed corresponding with sedimentation rate, rationally controls gas flow, can obtain the plug loose media of different size and different refractivity distribution curve.
2, the forming process of inner cladding (process that namely prepares the glass plug)
Plug loose media with above-mentioned formation, be placed on the sintering that dewaters in the agglomerating plant, this agglomerating plant is provided with inlet mouth 13 and venting port 14(such as Fig. 3), inlet mouth 13 passes into respectively chlorine, the mixed gas of tetrafluoro-methane and helium, they are respectively by high precision mass flow controller (MFC) adjust flux, chlorine flowrate is controlled at 0.2 ~ 2.0 l/mim, the tetrafluoro-methane flow control is at 100 ~ 1000 ml/min, helium gas flow is controlled at 10 ~ 40 l/min, dehydration temperaturre is controlled at 1000 ~ 1350 ℃, 2 ~ 6 h approximately dewater, siloxane bond in the open close further replacement of silicon dioxide of tetrafluoro-methane that enters (Si-O-) around here, silicon chlorine key (Si-Cl), reduce specific refractory power, control its refractive index contrast between-0.02% ~-0.07%, form inner cladding.Then be warmed up to 1400 ~ 1600 ℃, carry out vitrifying, allow loose SiO 2Particle is melting at high temperature, gets rid of internal gas, and the plug loose media has just become transparent glass plug like this.
3, prefabricated rods forming process
The two sagging glass plug of above-mentioned preparation is adopted OVD or VAD deposition surrounding layer, sinter transparent preform into by dehydration again.Can also pass through RIC technique, the glass plug of above-mentioned preparation is inserted pure SiO 2(help out if glass diameter of mandrel and casing inner diameter deviation can be inserted more greatly the thin skin pipe) in the sleeve pipe assemble preform directly melt the contracting or wire drawing.
The beneficial effects of the utility model:
Adopt the preform of this utility model device preparation, adopt deposition, sintering to reduce step by step the technique of specific refractory power, finished the design of the sagging type refractive index profile of double clad.Its producing apparatus, production technique advantages of simple, preparation cost and risk drop to minimum, the optical fiber of producing, parameter meets G.657 standard of ITU-T fully, have excellent bend-insensitive and the characteristic of low water peak absorption loss concurrently, and have low splice loss, splice attenuation and reliable mechanical property during with the conventional fiber welding.
Take above utility model device, prepared respectively 10 large size bend insensitive fiber prefabricated rods.As shown in Figure 2, adopt improved VAD technique to prepare the plug loose media, sandwich layer blowtorch 6 and covering blowtorch 7 are respectively by above-mentioned reaction 1 and 2, the SiO of generation 2And GeO 2Particulate is delivered to by flame near the end face of primary target rod, finally is deposited on the primary target plane rod end, forms thus sandwich layer and the sandwich layer inner cladding of plug loose media, controls its refractive index contrast between 0.41% ~ 0.50% and 0.25% ~ 0.35%.Sandwich layer surrounding layer 3 in the described plug is that sandwich layer surrounding layer blowtorch 8 is by doping CF 4SiCl 4The SiO of fluorine (F) is mixed in 1 generation that reacts 2Particle deposition is on sandwich layer inner cladding surface and the loosening body that forms, and refractive index contrast is controlled between-0.05% ~-0.20%.Gas flow is conventional the setting, does not do description at this.The primary target rod is slowly promoted and uniform rotation by servomotor, promotes speed corresponding with sedimentation rate, and the rotating speed of servomotor is 25 rev/mins, and speed-raising is 0.85 mm/min.
Above-mentioned 10 plug loose medias 9 are put into respectively as shown in Figure 3 the agglomerating plant sintering that dewaters, inlet mouth 13 passes into respectively the mixed gas of chlorine, tetrafluoro-methane and helium, they are respectively by high precision mass flow controller (MFC) adjust flux, chlorine flowrate is controlled at 0.2 ~ 2.0 l/mim, the tetrafluoro-methane flow control is at 0.3 ~ 0.5 l/min, helium gas flow is controlled at 10 ~ 40 l/min, dehydration temperaturre is controlled at 1100 ~ 1350 ℃, 2 ~ 5 h approximately dewater, then be warmed up to 1400 ~ 1600 ℃, carry out vitrifying, allow loose SiO 2Particle is melting at high temperature, control its refractive index contrast between-0.02% ~-0.07%, form inner cladding, get rid of internal gas, the plug loose media has just become transparent glass plug like this, after extending to the target glass plug through extension device again, having obtained refractive index profile is the glass plug of the sagging type of double clad.
It is suitable for OVD(Outside Vapor Deposition outside vapor deposition to choose simultaneously) quartz socket tube made of technique (control external diameter as 184mm internal diameter as 55mm), (helping out if glass diameter of mandrel and casing inner diameter deviation can be inserted more greatly quartzy thin skin pipe) in the glass plug insertion sleeve pipe is assembled into the RIC rod, be reduced to together the stretching tower is molten, stretching simultaneously and forming external diameter is the large-scale optical fiber prefabricating stick of 150mm, (HF) corrodes its surface with hydrofluoric acid, obtains transparent preform.Then these 10 preforms are adopted single-mode fiber production coating, drawing speed is 1500 m/mins, and the bare fibre diameter control is in the direct wire drawing of 125 ± 0.8 μ m.The optical fiber parameter that preform draws of preparation is as shown in table 1.
Table 1---optical fiber parameter
Figure 982369DEST_PATH_IMAGE002
The result shows, adopts the technical solution of the utility model, and performance perameter meets the G.657 standard of optical fiber of ITU-T fully, and with G.652D good compatibility is arranged.The experiment proved that, adopt manufacture method of the present utility model, the apparatus and process advantages of simple, preparation cost and risk drop to minimum, are fit to large-scale production.
The above, it only is the utility model exemplary embodiments, be not that technical scope of the present utility model is imposed any restrictions, any trickle modification, equivalent variations and modification that every foundation technical spirit of the present utility model is made above enforcement all still belong in the technical solution of the utility model scope.

Claims (3)

1. device of making large size bend insensitive fiber prefabricated rods, this device comprises depositing device, agglomerating plant, it is characterized in that:
Depositing device comprises sandwich layer blowtorch (6), sandwich layer inner cladding blowtorch (7), sandwich layer surrounding layer blowtorch (8), depositing device is used for the primary target rod is deposited as the plug loose media, and wherein the plug loose media includes sandwich layer (1), sandwich layer inner cladding (2), sandwich layer surrounding layer (3);
Wherein, sandwich layer blowtorch (6), sandwich layer inner cladding blowtorch (7) and sandwich layer surrounding layer blowtorch (8) are arranged in order from bottom to top along the outside of the curved part in primary target rod bottom; Above-mentioned each blowtorch selects silica glass, pottery or metallic substance to make, and profile is that square, oval or circular porous or multilayer material consists of; Porous on above-mentioned each blowtorch or multilevel access comprise inflammable gas runner, combustion-supporting gas runner, unstripped gas runner, impurity gas runner, and gas flow corresponding to each blowtorch all points to the same point on the plug axis;
Agglomerating plant comprises process furnace (11), furnace core tube (10), inlet mouth (13) and venting port (14), and wherein, process furnace (11) places the outer middle side part of furnace core tube (10); Inlet mouth (13) is positioned at furnace core tube (10) lower end; Venting port (14) is positioned at furnace core tube (10) upper end; Agglomerating plant is used for the plug loose media is sintered to the glass plug with inner cladding;
To the glass plug of above-mentioned preparation deposition surrounding layer, sinter transparent preform into by dehydration again, perhaps the glass plug of above-mentioned preparation is inserted in the pure quartz socket tube and assemble preform.
2. device according to claim 1 is characterized in that:
Described surrounding layer is pure silicon dioxide glass.
3. device according to claim 1, it is characterized in that: in depositing device, the primary target rod is slowly promoted and uniform rotation by servomotor, promotes speed corresponding with sedimentation rate, the rotating speed of servomotor is 25 rev/mins, and speed-raising is 0.85 mm/min.
CN 201220341489 2012-07-16 2012-07-16 Device for manufacturing large-size bend insensitive fiber preform rod Expired - Fee Related CN202912848U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108585470A (en) * 2018-05-10 2018-09-28 成都富通光通信技术有限公司 A kind of VAD prepares the device and method of highly doped germanium plug
CN111320374A (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
CN112279504A (en) * 2020-11-30 2021-01-29 江苏亨通光导新材料有限公司 Preparation device and preparation method of optical fiber preform
CN113716859A (en) * 2021-07-22 2021-11-30 付庆忠 Optical fiber preform core rod melting and shrinking treatment sectional detection and stretching integrated equipment
CN114349327A (en) * 2022-01-18 2022-04-15 江苏亨通光导新材料有限公司 Low-cost processing technology of bending insensitive single-mode optical fiber

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108585470A (en) * 2018-05-10 2018-09-28 成都富通光通信技术有限公司 A kind of VAD prepares the device and method of highly doped germanium plug
CN108585470B (en) * 2018-05-10 2021-08-20 成都富通光通信技术有限公司 Device and method for preparing high germanium-doped core rod by VAD (vapor axial deposition)
CN111320374A (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
CN111320374B (en) * 2018-12-15 2023-09-26 中天科技精密材料有限公司 Optical fiber preform and method for manufacturing the same
CN112279504A (en) * 2020-11-30 2021-01-29 江苏亨通光导新材料有限公司 Preparation device and preparation method of optical fiber preform
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
CN113716859A (en) * 2021-07-22 2021-11-30 付庆忠 Optical fiber preform core rod melting and shrinking treatment sectional detection and stretching integrated equipment
CN114349327A (en) * 2022-01-18 2022-04-15 江苏亨通光导新材料有限公司 Low-cost processing technology of bending insensitive single-mode optical fiber

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