CN103739196B - VAD prepares equipment and the method for porous plug - Google Patents
VAD prepares equipment and the method for porous plug Download PDFInfo
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- CN103739196B CN103739196B CN201210519583.XA CN201210519583A CN103739196B CN 103739196 B CN103739196 B CN 103739196B CN 201210519583 A CN201210519583 A CN 201210519583A CN 103739196 B CN103739196 B CN 103739196B
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Abstract
The present invention discloses the equipment that a kind of VAD prepares porous plug, comprises the laser apparatus and receptor that are arranged on reaction vessel both sides, and reaction vessel is provided with reaction vessel Qianmen and the front and back glass port for transmission laser; Reaction vessel Qianmen and front glass window are arranged at the upper and lower of reaction vessel the same side respectively; Receptor present position is corresponding with front glass window, and lower to position lower than reaction vessel Qianmen of the upper end face of receptor.Its method steps is: open laser apparatus and receptor; Lower extreme point and the laser of the kind rod in reaction vessel are tangent; In reaction vessel, add gaseous feed and light a fire; Off-response container front gates; Prepare porous plug.Reaction vessel Qianmen and front glass window are separately positioned on the upper and lower of reaction vessel by the present invention.The end face of receptor lower than under reaction vessel Qianmen along residing position.Avoid the impact that receptor opens and closes by reaction vessel Qianmen, eliminate the situation repeatedly adjusting receptor, ensure that it is accurate with this.
Description
Technical field
The present invention relates to technical field of photo communication, a kind of VAD of specific design legal system for equipment used during porous plug, and uses the preparation method corresponding to this equipment.
Background technology
VAD(VaporAxialDeposition), i.e. vapor-phase axial deposition.The roughly process that VAD prepares porous plug is: main raw material doping agent is sent into reaction vessel in a gaseous form, makes it, in the hydrolysis of reaction vessel Flame, to produce silica glass particle dust.This dust deposit is in the kind stick end be made up of materials such as quartz, graphite or aluminum oxide.The porous plug of certain size is formed through Multiple depositions.This porous plug is the porous cancellous prose style free from parallelism work in-process making preform sandwich layer.After deposition terminates, then porous plug is at high temperature dewatered, sinter transparent solid glass rod into, and the preform needed for obtaining through outsourcing.
Prepare in the working process description of porous plug as can be seen from above-mentioned to VAD, porous plug is made through bottom deposition in reaction vessel.In the prior art, usual employing laser controls the sedimentation velocity of porous plug lower end, its principle is: utilize the laser transmitter in laser apparatus to produce beam of laser, laser is tangent with the porous plug lower surface point prepared, the receptor relative with laser transmitter is used for responding to laser, and obtains data to control sedimentation velocity with this.
But due to the defect on device structure in prior art, make laser apparatus all will carry out accuracy adjustment before every subjob.Existing installation as shown in fig. 1, comprises reaction vessel, laser apparatus 5 and receptor 6.Reaction vessel is provided with reaction vessel Qianmen 2 for putting into material and front and back glass port 3.Wherein, front glass window 4 is embedded on reaction vessel Qianmen 2, and rear glass port 3 correspondence is arranged on the rear side of reaction vessel.The laser that laser apparatus 5 penetrates penetrates rear glass port 3 successively and front glass window 4 is responded to by receptor 6.Receptor 6 requirement can accurately sense injection laser, controls the sedimentation velocity of porous plug 1 lower end with this.As can be seen from the figure, because the lower edge at reaction vessel Qianmen 2 is near the bottom surface of reaction vessel, so in the front and back of every subjob, all receptor 6 must be removed.When again carrying out depositing operation, the position having to again receptor 6 to move on to laser beam adjusts.But, all can deviation be there is when each adjustment in no matter laser beam thin again and more accurate receptor 6.In addition, in existing installation, in order to adapt to repeatedly the action of " remove-reset ", receptor generally all adopts movable connection structure, namely receptor all can rotate, transverse direction or move up and down.But therefore also create some problems, on the one hand, have impact on the stability of receptor position, and the corresponding as easy as rolling off a log appearance of turning joint loosens; On the other hand, because reaction vessel has higher temperature in operation process, so the joint that receptor loosens easily is moved by thermogenesis.Above-mentioned two aspects all there will be measured deviation, and this is in VAD depositing operation can not be received.Because the change of laser beam induction point can cause the change of geometry and optical parametric between porous plug and porous plug, finally having influence on porous plug is qualification rate and the quality that raw material sinters the preform of preparation.
As shown in Figure 3, the concrete steps for the production method corresponding to existing installation are: a, open laser apparatus; B, kind of a rod is moved to laser position, make kind of excellent lower extreme point and laser tangent; C, in reaction vessel, add gaseous feed and light a fire, off-response container front gates, starting hydrolysis reaction; D, by receptor reset after, adjust and lock receptor; E, prepare porous plug through gas deposition, flame-outly terminate preparation.
By above-mentioned known, use existing installation to prepare porous plug, when every subjob, be absolutely necessary production stage to carry out " reset-adjustment-locking " to receptor.And repeatedly adjustment operation is carried out to the turning joint of receptor, joint can be made to produce and to loosen.After starting operation, due to the heat that the flame hydrolysis in reaction vessel produces, will certainly effect of expanding with heat and contract with cold be caused, and then make the receptor adjusted produce position deviation.
In actual production, the performance requriements for porous plug is typically implemented in the test parameter of preform sintering and make, wherein common and most importantly evaluate by core bag ratio (t/a) and core bag refringence (Δ).Geometry between the porous plug that existing installation is produced and porous plug and optical parametric instability, so the preform sintered can not meet expection requirement.Such as, although current VAD production technique can make model be G.652, the preform of the optical fiber property requirement such as G.657.But qualification rate is lower, stability and continuously consistence is poor.It can thus be appreciated that existing equipment has restricted further utilization and the development of VAD technology.
Summary of the invention
In view of this, the invention provides a kind of VAD and prepare the equipment of porous plug and the method for correspondence, can be good at solving in the front and back of production porous plug, receptor needs the problem repeatedly adjusted.
For solving above technical problem, technical scheme of the present invention is, VAD prepares an equipment for porous plug, comprises the laser apparatus and receptor that are arranged on reaction vessel both sides, and described reaction vessel is provided with reaction vessel Qianmen and the front and back glass port for transmission laser; Described reaction vessel Qianmen and front glass window are arranged at the upper and lower of reaction vessel the same side respectively; Described receptor present position is corresponding with front glass window, and lower to position lower than reaction vessel Qianmen of the upper end face of receptor.
Further, the below of described reaction vessel is provided with pylon, and this pylon is used for fixation reaction container, laser apparatus and receptor, and described laser apparatus and receptor are fixed by the web member and pylon being provided with adjustment mechanism.
Further, the adjustment mechanism in described web member, is made up of horizontal adjusting mechanism and vertical adjustment mechanism, and horizontal adjusting mechanism is for adjusting the displacement in receptor horizontal plane, and vertical adjustment mechanism is for adjusting the displacement in receptor vertical plane.
Further, described horizontal adjusting mechanism and vertical adjustment mechanism are respectively equipped with locking latches, locking latches is used for the adjustment position of fixed reception device.
Further, the rear end of described receptor is provided with receptor protecting sheet, and this receptor protecting sheet is fixed on described pylon.
Further, described receptor protecting sheet is provided with upper cover, the position of this upper cover between the upper end face and the lower edge at reaction vessel Qianmen of receptor.
Further, the transmission area of described front and back glass port is more than or equal to the setting range of adjustment mechanism.
Further, described reaction vessel is provided with the position of front glass window, forms concave inward structure compared to the position being provided with reaction vessel Qianmen.
VAD prepares a method for porous plug, and its concrete steps are:
S1, unlatching laser apparatus and receptor, Emission Lasers also responds to laser;
Kind rod in S2, reaction vessel moves to laser position, make kind of excellent lower extreme point and laser tangent;
S3, in reaction vessel, add gaseous feed and light a fire, off-response container front gates, starting flame hydrolysis;
S4, prepare porous plug through gas deposition, flame-outly terminate preparation.
Compared with prior art, reaction vessel Qianmen is separated setting with front glass window by the present invention, and is separately positioned on the upper and lower of reaction vessel.In order to sense transmission laser smoothly, the position of receptor must be corresponding with front glass window.Meanwhile, require the end face of receptor lower than under reaction vessel Qianmen along residing position.Such setting avoids each before and after operation, the impact that receptor opens and closes by reaction vessel Qianmen, and the situation about repeatedly adjusting of having to.Effectively ensure that the induction accuracy of receptor.And then ensure that less deviation appears in the parameters between porous plug and porous plug prepared.
In additional technical feature, reaction vessel, laser apparatus and receptor are separately fixed on pylon, are to make the position of above-mentioned three relatively fixing, can not be given a shock in operation process, the external factor such as thermal radiation affects its position accuracy.And by laser apparatus and receptor being connected with pylon with level, the vertically web member of adjustment mechanism, object is to facilitate equipment to adjust to default accuracy when dispatching from the factory.The effect arranging locking latches is, the accuracy of laser apparatus and receptor can be positioned at Default Value on the one hand; On the other hand, if equipment runs into applied external force in operation process, accuracy is caused to offset, can by after loosening locking latches and adjusting accordingly, then by its locking positioning.
In additional technical feature, be also provided with receptor protecting sheet, its role is to, provide safeguard for receptor is in predeterminated position all the time, to prevent external influences to the reception accuracy of receptor.And on protecting sheet, be provided with upper cover, and upper cover is arranged on the position between the upper end face of receptor and the lower edge at reaction vessel Qianmen, protect when putting into material in reaction vessel with this, the material dropped can not have an impact to receptor.
Accompanying drawing explanation
Fig. 1 is prior art device structure schematic diagram;
Fig. 2 is device structure schematic diagram of the present invention;
Fig. 3 is prior art production scheme;
Fig. 4 is production scheme of the present invention;
Fig. 5 is that the core bag of the preform adopting gained porous plug of the present invention to prepare compares comparative bid parameter;
Fig. 6 is the core bag refringence comparative bid parameter of the preform adopting gained porous plug of the present invention to prepare.
In figure: 1, porous plug, 2, reaction vessel Qianmen, 3, rear glass port, 4, front glass window, 5, laser apparatus, 6, receptor, 7, receptor protecting sheet, 8, pylon.
Embodiment
Core thinking of the present invention is that front glass window is separated setting with reaction vessel Qianmen, and makes it lay respectively at upper and lower on front side of reaction vessel.Thus, movement-reset-adjustment that the receptor that corresponding front glass window is arranged can not carry out repeatedly because of the keying at reaction vessel Qianmen again ".Ensure that receptor can be in the state of high accuracy induction all the time with this.And then guarantee the consistence of parameter between porous plug prepared by every subjob and porous plug.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
See Fig. 2, a kind of VAD prepares the equipment of porous plug 1, comprises the laser apparatus 5 and receptor 6 that are arranged on reaction vessel both sides.Wherein, reaction vessel Qianmen 2 and the front and back glass port 3 for transmission laser is provided with on the reaction vessel.Reaction vessel Qianmen 2 and front glass window 4 are arranged at reaction vessel the same side respectively, i.e. the upper and lower of front side.Be arranged on the laser apparatus 5 of reaction vessel both sides and receptor 6 corresponding respectively after glass port 3 and front glass window 4 arrange.And the upper end face being positioned at the receptor 6 on front side of reaction vessel must be lower to position lower than reaction vessel Qianmen 2.Said structure can meet in the process opened and closed at reaction vessel Qianmen 2, can not impact the accuracy of receptor 6.
In order to the relative position further firmly between reaction vessel, laser apparatus 5 and receptor 6.The below of reaction vessel is provided with pylon 8, reaction vessel, laser apparatus 5 and receptor 6 are fixed on this pylon 8.Wherein, laser apparatus 5 and receptor 6 are fixed by the web member and pylon 8 being provided with adjustment mechanism.Adjustment mechanism on this web member comprises horizontal adjusting mechanism and vertical adjustment mechanism.Wherein, horizontal adjusting mechanism is for adjusting the displacement in receptor 6 horizontal plane, and vertical adjustment mechanism is for adjusting the displacement in receptor 6 vertical plane.
If the object of adjustment mechanism is, when facilitating equipment to dispatch from the factory, default accuracy is adjusted.Because how many arranging of adjustment mechanism can affect laser apparatus 5 and the susceptor stability when operation.So be respectively arranged with locking latches on horizontal adjusting mechanism and vertical adjustment mechanism, the stability as laser apparatus 5 and susceptor provides further guarantee.
In order to strengthen the protection to receptor 6 relative position, be provided with receptor protecting sheet 7 in the rear end of receptor 6.This susceptor protecting sheet is fixed on pylon 8 equally.Prevent external factor from disturbing the stability of receptor 6 position with this, such as the careless collision occurred.Receptor protecting sheet 7 is also provided with upper cover, and the setting of this upper cover is adding in reaction vessel to prevent or taking out in the process of material, and the residue dropped is on the impact of receptor 6.
In operation process, laser beam by front and back glass port 3 transmission, so when equipment dispatch from the factory carry out laser apparatus 5 adjust with receptor 6 accuracy time, need the setting range being set to the transmission area of front and back glass port 3 to be more than or equal to adjustment mechanism.The shape of front and back glass port 3 can be circular, square or other Polygonss.
As shown in Figure 2, be provided with the position of front glass window 4 at reaction vessel, form concave inward structure compared to the position being provided with reaction vessel Qianmen 2.The object of such setting is, receptor 6 can be arranged near reaction vessel concave inward structure place, and volume shared by minimizing equipment, can conveniently be operated in reaction vessel by reaction vessel Qianmen 2 on the other hand on the one hand.
As shown in Figure 4, relative to the modified node method of aforesaid device, the method that corresponding VAD prepares porous plug 1 there has also been corresponding change, and its concrete steps are:
S1, unlatching laser apparatus and receptor, Emission Lasers also responds to laser;
Kind rod in S2, reaction vessel moves to laser position, make kind of excellent lower extreme point and laser tangent;
S3, in reaction vessel, add gaseous feed and light a fire, off-response container front gates, starting flame hydrolysis;
S4, prepare porous plug through gas deposition, flame-outly terminate preparation.
From the contrast of Fig. 3 and Fig. 4, the method that method used in the present invention adopts compared to prior art, decreases and adjust this step of receptor 6 accuracy before operation.Not only simplify the production stage of VAD, and avoid owing to repeatedly adjusting receptor 6, make the induction accuracy tool situation devious of receptor 6.
Enumerate some experimental data below to prove, the porous plug 1 obtained by the equipment in the present invention and method is raw material, prepared preform than existing porous plug 1 for preform prepared by raw material has good parameter consistency and stability.
Administrative standard:
Axial standard deviation: the <0.04 of t/a.
Axial standard deviation: the <0.005 of Δ.
Axial standard deviation: the <0.05 of MFD.
λ c-axis is to standard deviation: < 20.
1310nm attenuation by absorption: <0.34dB/km.
1550nm attenuation by absorption: <0.2dB/km.
1550nm attenuation by absorption: <0.24dB/km.
1383nm attenuation by absorption: <0.33dB/km.
Above-mentioned parameter adopts following formula when measuring:
Core bag is be defined as follows than t/a:
Core bag is than t/a=layer2/layer1 (1)
Wherein: layer1 is sandwich layer diameter, layer2 outer cladding diameter.
Refractive indices is defined by following equation:
Refractive indices (%)=[(n
1 2-n
2 2)/2n
1 2] (2)
Wherein: n
1for the Refractive Index of Material of fine layer, n
2for the Refractive Index of Material of surrounding layer.
The definition of index distribution refers to the relation of in the selected part of optical fiber specific refractory power or refringence (Δ) fiber optic hub position ri (radius) corresponding thereto.
Mode field diameter MFD: foundational model field amplitude is reduced to the 1/e of maximum value by prefabricated rods axle (r=0) maximum value or foundational model field intensity is reduced to the 1/e of maximum value by prefabricated rods axle (r=0) maximum value
2time corresponding radius twice.
Cut-off wavelength: the shortest operation wavelength that basic mode can only be conducted in prefabricated rods.Be expressed as:
In formula:
λ
c---cutoff wavelength;
N
c---plug specific refractory power;
Δ---core bag specific refractivity;
Α---the ESI plug radius of female rod;
Γ---wire drawing contraction ratio.
The decay of optical fiber, refer to when injecting from one end of optical fiber, and when penetrating from the other end, light intensity can weaken, and has been attenuated when namely light is propagated in the fibre, is called the decay of optical fiber.The size of optical fiber attenuation is defined by following equation:
A=-10log (P
go out/ P
enter) (4)
P in above formula
enterand P
go outbe respectively the luminous power measured by optic fibre input end and output terminal.
Prior art samples:
The preform produced by prior art is selected 20 samples, preform useful length 550mm, get its mean value, performance is as follows:
The axial standard deviation of t/a: 0.0389.
The axial standard deviation of Δ: 0.0035.
The axial standard deviation of MFD: 0.0182.
λ c-axis is to standard deviation: 15.75.
1310nm attenuation by absorption: 0.324dB/km.
1550nm attenuation by absorption: 0.187dB/km.
1550nm attenuation by absorption: 0.197dB/km.
1383nm attenuation by absorption: 0.282dB/km.
The present invention samples:
Sampling 1:
1 porous plug 1(sample1 is made with aforesaid method), and obtain preform by sintering process.Gained preform useful length 550mm, core bag ratio (t/a) mean value is 4.94, and refringence (Δ) mean value of fibre core and covering is 0.348%.
The preform performance of gained is as follows:
The axial standard deviation of t/a: 0.0194.
The axial standard deviation of Δ: 0.0023.
The axial standard deviation of MFD: 0.0122.
λ c-axis is to standard deviation: 9.26.
1310nm attenuation by absorption: 0.32 ~ 0.33dB/km.
1550nm attenuation by absorption: 0.18 ~ 0.19dB/km.
1550nm attenuation by absorption: 0.19 ~ 0.2dB/km.
1383nm attenuation by absorption: 0.275 ~ 0.285dB/km.
Core bag interfacial stress axial distribution: evenly, unanimously.
Waveguiding structure axial distribution: consistence is good.
Sampling 2:
1 porous plug 1(sample2 is made with aforesaid method), and obtain preform by sintering process.Gained preform useful length 550mm, core bag ratio (t/a) mean value is 4.95, and refringence (Δ) mean value of fibre core and covering is 0.349%.
The preform performance of gained is as follows:
The axial standard deviation of t/a: 0.0244.
The axial standard deviation of Δ: 0.0031.
The axial standard deviation of MFD: 0.0173.
λ c-axis is to standard deviation: 9.04.
1310nm attenuation by absorption: 0.32 ~ 0.33dB/km.
1550nm attenuation by absorption: 0.18 ~ 0.19dB/km.
1550nm attenuation by absorption: 0.19 ~ 0.2dB/km.
1383nm attenuation by absorption: 0.275 ~ 0.285dB/km.
Core bag interfacial stress axial distribution: evenly, unanimously.
Waveguiding structure axial distribution: consistence is good.
Sampling 3:
1 porous plug 1(sample3 is made with aforesaid method), and obtain preform by sintering process.Gained preform useful length 550mm, core bag ratio (t/a) mean value is 4.92, and refringence (Δ) mean value of fibre core and covering is 0.347%.
The preform performance of gained is as follows:
The axial standard deviation of t/a: 0.0202.
The axial standard deviation of Δ: 0.0025.
The axial standard deviation of MFD: 0.0136.
λ c-axis is to standard deviation: 9.67.
1310nm attenuation by absorption: 0.32 ~ 0.33dB/km.
1550nm attenuation by absorption: 0.18 ~ 0.19dB/km.
1550nm attenuation by absorption: 0.19 ~ 0.2dB/km.
1383nm attenuation by absorption: 0.275 ~ 0.285dB/km.
Core bag interfacial stress axial distribution: evenly, unanimously.
Waveguiding structure axial distribution: consistence is good.
As can be seen from Figure 5, adopt the porous plug 1 that the Apparatus and method in the present invention obtains, the core bag ratio between the preform obtained as raw material and preform possesses stability.
As can be seen from Figure 6, adopt the porous plug 1 that the Apparatus and method in the present invention obtains, the preform obtained as raw material is same with the core bag refringence between preform possesses stability.
Can clearly find out from above-mentioned Data Comparison, the preform that the porous plug 1 obtained with equipment of the present invention and method is prepared for raw material, compared to the preform that prior art porous plug 1 is prepared for raw material, geometry and optical parametric have more standby consistence and stability.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. VAD prepares an equipment for porous plug, comprises the laser apparatus and receptor that are arranged on reaction vessel both sides, and described reaction vessel is provided with reaction vessel Qianmen and the front and back glass port for transmission laser; It is characterized in that: described reaction vessel Qianmen and front glass window are arranged at the upper and lower of reaction vessel the same side respectively; Described receptor present position is corresponding with front glass window, and lower to position lower than reaction vessel Qianmen of the upper end face of receptor.
2. VAD as claimed in claim 1 prepares the equipment of porous plug, it is characterized in that: the below of described reaction vessel is provided with pylon, this pylon is used for fixation reaction container, laser apparatus and receptor, and described laser apparatus and receptor are fixed by the web member and pylon being provided with adjustment mechanism.
3. VAD as claimed in claim 2 prepares the equipment of porous plug, it is characterized in that: the adjustment mechanism in described web member, be made up of horizontal adjusting mechanism and vertical adjustment mechanism, horizontal adjusting mechanism is for adjusting the displacement in receptor horizontal plane, and vertical adjustment mechanism is for adjusting the displacement in receptor vertical plane.
4. VAD as claimed in claim 3 prepares the equipment of porous plug, it is characterized in that: described horizontal adjusting mechanism and vertical adjustment mechanism are respectively equipped with locking latches, and locking latches is used for the adjustment position of fixed reception device.
5. VAD as claimed in claim 2 prepares the equipment of porous plug, and it is characterized in that: the rear end of described receptor is provided with receptor protecting sheet, this receptor protecting sheet is fixed on described pylon.
6. VAD as claimed in claim 5 prepares the equipment of porous plug, it is characterized in that: described receptor protecting sheet is provided with upper cover, the position of this upper cover between the upper end face and the lower edge at reaction vessel Qianmen of receptor.
7. VAD as claimed in claim 2 prepares the equipment of porous plug, it is characterized in that: the transmission area of described front and back glass port is more than or equal to the setting range of adjustment mechanism.
8. VAD as claimed in claim 1 prepares the equipment of porous plug, it is characterized in that: described reaction vessel is provided with the position of front glass window, forms concave inward structure compared to the position being provided with reaction vessel Qianmen.
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| CN107540207A (en) * | 2017-10-17 | 2018-01-05 | 长飞光纤光缆股份有限公司 | A kind of outer method of pipe prepares the device and method of preform mother metal |
| CN109407109B (en) * | 2018-12-28 | 2024-01-16 | 江苏通鼎光棒有限公司 | Device for monitoring sintering length of VAD loose body and monitoring method thereof |
| CN115872612A (en) * | 2022-12-07 | 2023-03-31 | 武汉烽火锐拓科技有限公司 | Stable control method and control system for deposition speed of core rod |
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| JP2009107874A (en) * | 2007-10-29 | 2009-05-21 | Sumitomo Electric Ind Ltd | Method for producing glass particulate deposited body |
| CN102643020A (en) * | 2011-02-16 | 2012-08-22 | 住友电气工业株式会社 | Glass particle stacking body manufacturing method |
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| JPS63176327A (en) * | 1987-01-12 | 1988-07-20 | Sumitomo Electric Ind Ltd | Production of porous glass preform for optical fiber |
| JPH11292558A (en) * | 1998-04-07 | 1999-10-26 | Furukawa Electric Co Ltd:The | Reactor for production of glass fine particle deposit for optical fiber glass |
| JP2003313042A (en) * | 2002-02-22 | 2003-11-06 | Sumitomo Electric Ind Ltd | Apparatus for manufacturing glass particulate deposit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009107874A (en) * | 2007-10-29 | 2009-05-21 | Sumitomo Electric Ind Ltd | Method for producing glass particulate deposited body |
| CN102643020A (en) * | 2011-02-16 | 2012-08-22 | 住友电气工业株式会社 | Glass particle stacking body manufacturing method |
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Effective date of registration: 20191218 Address after: 611731 No.78 Baicao Road, Chengdu high tech Zone (West Zone), Chengdu, Sichuan Co-patentee after: Hangzhou Futong Communication Technology Co., Ltd. Patentee after: Chengdu Futong Optical Communication Technologies Co., Ltd. Address before: 611731, Sichuan, Chengdu province high Western District, No. 78 herb Road Patentee before: Chengdu Futong Optical Communication Technologies Co., Ltd. |