CN109557622B - Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light receiving device using same - Google Patents
Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light receiving device using same Download PDFInfo
- Publication number
- CN109557622B CN109557622B CN201811459967.0A CN201811459967A CN109557622B CN 109557622 B CN109557622 B CN 109557622B CN 201811459967 A CN201811459967 A CN 201811459967A CN 109557622 B CN109557622 B CN 109557622B
- Authority
- CN
- China
- Prior art keywords
- collimating lens
- collimator
- fiber end
- coupling
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010168 coupling process Methods 0.000 title claims abstract description 55
- 230000008878 coupling Effects 0.000 title claims abstract description 51
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 51
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 239000013307 optical fiber Substances 0.000 claims description 31
- 239000000835 fiber Substances 0.000 claims description 29
- 230000004044 response Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
- G02B6/4227—Active alignment methods, e.g. procedures and algorithms
-
- 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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
-
- 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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention relates to the technical field of four-channel wavelength division multiplexing, in particular to a computer readable storage medium and a laser coupling device of a four-channel wavelength division multiplexing light receiving device using the medium. Coupling is carried out in a three-dimensional rectangular coordinate system taking the horizontal displacement direction of light in the demultiplexer DeMux as the X-axis direction, the collimator positions of the first channel and the fourth channel under the condition that the coupling power is larger than a preset value M are firstly used for confirming the fixed position of the collimator, and then the collimator lenses of the four channels are coupled and fixed to the position with the coupling power larger than a preset value N one by one to finish the coupling. When each channel is coupled, only the position change of the channel relative to the collimator with the fixed position needs to be concerned, and the comparison and adjustment are not needed according to the result of the previous laser coupling, so that the coupling is quicker and more effective.
Description
Technical Field
The invention relates to the technical field of four-channel wavelength division multiplexing, in particular to a computer readable storage medium and a laser coupling device of a four-channel wavelength division multiplexing light receiving device using the medium.
Background
With the high-speed development of the internet, big data, artificial intelligence and high-definition television, the requirement on the transmission rate of the optical fiber network is higher and higher, and people use various methods to improve the transmission rate of the optical fiber network, on one hand, the rate of the chip is improved, but the improvement of the rate of the chip is too slow due to the limitation of the material and the improvement rate of the chip, and at present, the main chip only supports 25G, and the requirement of the market on the transmission rate cannot be met. In order to solve the requirement of the market on the transmission rate, on the other hand, a multichannel wavelength division multiplexing system is developed, a plurality of channels are combined together through the wavelength division multiplexing system, the transmission rate of an optical fiber network is improved, and the currently mainstream technology is 4-channel wavelength division multiplexing. The existing coupling method is that a collimating lens, a multiplexer and a collimator are arranged in sequence, then coupling is carried out one by one according to the position of each channel, the speed is slow, and if the coupling process of the front channel is changed, each channel at the back needs to be contrasted and adjusted, and the adjustment amplitude is too large.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a laser coupling method for a four-channel wavelength division multiplexing light receiving device, which is faster and more effective.
The purpose of the invention is realized by the following technical scheme:
there is provided a computer-readable storage medium for realizing laser coupling of a four-channel wavelength division multiplexing light-receiving device, storing a computer program which, when executed by a processor, realizes the steps of:
the four-channel wavelength division multiplexing light receiving device comprises a shell, wherein light receiving chips PD1-1/1-2/1-3/1-4 of four channels, a first collimating lens/a second collimating lens/a third collimating lens/a fourth collimating lens and a demultiplexer DeMux which are in one-to-one correspondence with the light receiving chips PD1-1/1-2/1-3/1-4 are all packaged in the shell, an optical fiber end collimating lens is arranged on the outer side of the shell close to the demultiplexer DeMux, and a collimator is arranged on one side, back to the shell, of the optical fiber end collimating lens;
a three-dimensional rectangular coordinate system establishing step of establishing a three-dimensional rectangular coordinate system by taking the horizontal displacement direction of light in the demultiplexer DeMux as the X-axis direction;
fixing the optical fiber end collimating lens, namely relatively fixing the optical fiber end collimating lens and the shell, enabling the collimator on the outer side of the shell to move in a reciprocating manner along the X-axis direction until the value of the coupling response current exceeds a preset value M, and recording the position of the collimator relative to the optical fiber end collimating lens;
and a fiber laser coupling step, wherein the fiber end collimating lens is laser-fixed on the shell, and the collimator is arranged at the position opposite to the fiber end collimating lens.
The step of fixing the fiber end collimating lens comprises a checking step, wherein response current curves of four channels are obtained by scanning in a preset range around a point on a plane formed by an X axis and a Y axis where the point exceeding a preset value M is located, and the centers of the response current curves of the four channels are used as laser positions.
And the angle and/or distance between the adjusting shell and the fiber end collimating lens relative to the collimator are/is respectively performed on a plane formed by a Y axis and a Z axis under the same X axis position.
In the step of fixing the fiber end collimating lens, the fixing position is determined according to the average value of the two position coordinates.
The method comprises a collimator laser coupling step executed after the optical fiber laser coupling step, wherein a connector is arranged between an optical fiber end collimating lens and the collimator, the collimator moves in the X-axis direction, the optical fiber end collimating lens moves on a plane formed by a Y axis and a Z axis, the position of the connector and the position of the collimator of the first collimating lens/the fourth collimating lens are obtained when the coupling power is larger than a preset value N, the fixed position of the connector and the fixed position of the collimator are respectively determined according to the two positions, and the collimator laser is fixed on the connector.
The collimator and the connector are fixed, the fiber end collimating lens moves on a plane formed by a Y axis and a Z axis, positions where coupling powers of the four channels are larger than a preset value L are obtained as fixed positions, and the connector is fixed on the fiber end collimating lens.
The preset value M is the preset value N is the preset value L, and all the preset values are the optimal coupling power.
There is also provided a laser coupling apparatus for a four-channel wavelength division multiplexing optical receiving device, comprising a processor and the above-mentioned computer-readable storage medium, on which a computer program is executable by the processor.
The invention has the beneficial effects that:
the laser coupling device and the method thereof of the four-channel wavelength division multiplexing light receiving device perform coupling in a three-dimensional rectangular coordinate system taking the horizontal displacement direction of light in a demultiplexer DeMux as the X-axis direction, confirm the fixed positions of a fiber end collimating lens and a collimator by using the positions of the collimating lenses of a first channel and a fourth channel when the coupling power is larger than a preset value M, fix the laser of the fiber end collimating lens on a shell, and fix the collimator relative to the position of the fiber end collimating lens to complete the coupling. When each channel is coupled, only the position change of the channel relative to the collimator with the fixed position needs to be concerned, and the comparison and adjustment are not needed according to the result of the previous laser coupling, so that the coupling is quicker and more effective.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic structural view of a laser coupling device of the four-channel wavelength division multiplexing optical receiving device.
Detailed Description
The invention is further described with reference to the following examples.
The laser coupling device of the four-channel wavelength division multiplexing light receiving device comprises a shell, light receiving chips PD1-1/1-2/1-3/1-4 of four channels, a first collimating lens 2-1, a second collimating lens 2-2, a third collimating lens 2-3, a fourth collimating lens 2-4 and a demultiplexer DeMux3 which are in one-to-one correspondence with the light receiving chips PD1-1/1-2/1-3/1-4 are all packaged in the shell 4, an optical fiber end collimating lens 5 is arranged on the outer side of the shell 4 close to the demultiplexer DeMux3, a collimator 7 is arranged on one side, back to the shell, of the optical fiber end collimating lens 5, and a connector 6 is arranged between the optical fiber end collimating lens 5 and the collimator 7.
The coupling method of the laser coupling device of the four-channel wavelength division multiplexing light receiving device comprises the following steps.
A three-dimensional rectangular coordinate system establishing step of establishing a three-dimensional rectangular coordinate system with the horizontal displacement direction of light in the demultiplexer DeMux3 as the X-axis direction;
fixing an optical fiber end collimating lens, namely relatively fixing the optical fiber end collimating lens 5 and a shell 4, enabling a collimator 7 on the outer side of the shell 4 to move back and forth along the X-axis direction, recording the position of the collimator 7 of the optical fiber end collimating lens 5 relative to the optical fiber end collimating lens 5 of the collimator 7 until the value of coupling response current exceeds a preset value M by the collimator 7 of the optical fiber end collimating lens 5 of the shell 4;
and a fiber laser coupling step, wherein the fiber end collimating lens 5 is laser-fixed on the shell 4, and the collimator 7 is arranged at the position opposite to the fiber end collimating lens 5.
The method comprises the following steps of fixing the fiber end collimating lens, wherein the fixing step comprises a checking step, scanning in a preset range around a point on a plane formed by an X axis and a Y axis, where the point exceeds a preset value M is located, so as to obtain response current curves of four channels, and taking the center of the response current curves of the four channels as the position of laser.
The angle and/or distance between the housing 4 and the fiber end collimating lens 5 relative to the collimator 7 are/is adjusted on a plane formed by a Y axis and a Z axis at the same X axis position.
In the step of fixing the fiber end collimating lens, the fixing position is determined according to the average value of the two position coordinates.
The method comprises a laser coupling step of a collimator 7 executed after the laser coupling step of the optical fiber, wherein a connector 6 is arranged between an optical fiber end collimating lens 5 and the collimator 7, the collimator 7 moves in the X-axis direction, the optical fiber end collimating lens 5 moves on a plane formed by the Y-axis and the Z-axis to obtain the position of the connector 6 and the position of the collimator 7 of the first collimating lens/the fourth collimating lens when the coupling power is larger than a preset value N, the fixed position of the connector 6 and the fixed position of the collimator 7 are respectively determined according to the two positions, and the collimator 7 is fixed on the laser connector 6.
The collimator 7 and the connector 6 are fixed, the fiber end collimating lens 5 moves on a plane formed by a Y axis and a Z axis, positions where the coupling powers of the four channels are all larger than a preset value L are obtained as fixed positions, and the connector 6 is fixed on the fiber end collimating lens 5.
The preset value M is the preset value N is the preset value L, and all the preset values are the optimal coupling power.
The laser coupling device of the four-channel wavelength division multiplexing light receiving device and the method thereof couple in a three-dimensional rectangular coordinate system taking the horizontal displacement direction of light in a demultiplexer DeMux3 as the X-axis direction, firstly confirm the fixed positions of an optical fiber end collimating lens 5 and a collimator 7 by using the collimating lenses of a first channel and a fourth channel at the position of the collimator 7 with the coupling power larger than a preset value M, fix the laser of the optical fiber end collimating lens 5 on a shell 4, and fix the collimator 7 relative to the laser of the optical fiber end collimating lens 5, thus completing the coupling. When coupling each channel, only the position change of the collimator 7 relative to the fixed position needs to be concerned, and the comparison adjustment is not needed according to the result of the previous laser coupling, so that the coupling is more rapid and effective.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The computer readable storage medium, it stores the computer program used for realizing laser coupling of the wavelength division multiplexing light receiving device of the four-channel, characterized by that, the wavelength division multiplexing light receiving device of the four-channel includes the body, the light receiving chip PD1-1/1-2/1-3/1-4 of the four-channel, first collimating lens/second collimating lens/third collimating lens/fourth collimating lens and demultiplexer DeMux that correspond to it one-to-one are all capsulated in the body, the collimating lens of fiber end is set up in the outside of body close to demultiplexer DeMux, the collimator is set up in the side that the collimating lens of fiber end faces away from the body;
the program when executed by a processor implements the steps of:
a three-dimensional rectangular coordinate system establishing step of establishing a three-dimensional rectangular coordinate system by taking the horizontal displacement direction of light in the demultiplexer DeMux as the X-axis direction;
fixing the optical fiber end collimating lens, namely relatively fixing the optical fiber end collimating lens and the shell, enabling the collimator on the outer side of the shell to move in a reciprocating manner along the X-axis direction until the value of the coupling response current exceeds a preset value M, and recording the position of the collimator relative to the optical fiber end collimating lens;
the optical fiber laser coupling step, fixing the laser of the collimating lens of the optical fiber end on the shell, and arranging the collimator at the position opposite to the collimating lens of the optical fiber end;
the step of fixing the fiber end collimating lens comprises a checking step, wherein response current curves of four channels are obtained by scanning in a preset range around a point on a plane formed by an X axis and a Y axis where the point exceeding a preset value M is located, and the centers of the response current curves of the four channels are used as laser positions.
2. The computer-readable storage medium of claim 1, wherein the fiber end collimating lens fixing step further comprises: and adjusting the angle and/or distance between the shell and the fiber end collimating lens relative to the collimator on a plane formed by the Y axis and the Z axis at the same X axis position.
3. The computer-readable storage medium of claim 1, wherein in the fiber-end collimating lens fixing step, the fixing position is determined based on an average of two position coordinates.
4. The computer-readable storage medium of claim 2, comprising a collimator laser coupling step performed after the fiber laser coupling step, wherein a connector is disposed between the fiber end collimating lens and the collimator, the collimator moves in the X-axis direction, the fiber end collimating lens moves in the plane formed by the Y-axis and the Z-axis, the connector position and the collimator position of the first collimating lens/the fourth collimating lens are obtained when the coupling power is greater than the preset value N, and the fixing position of the connector and the fixing position of the collimator are determined according to the two positions, respectively, so as to fix the collimator laser on the connector.
5. The computer-readable storage medium of claim 4, wherein the collimator and the connector are fixed, and the fiber end collimating lens is moved on the plane formed by the Y-axis and the Z-axis to obtain a position where the coupling powers of the four channels are greater than the predetermined value L as the fixed position, and the connector is fixed on the fiber end collimating lens.
6. The computer-readable storage medium of claim 5, wherein the predetermined values M and N are the predetermined values L and are the optimal coupling power.
7. A laser coupling apparatus for a four-channel wavelength division multiplexing optical receiver device, comprising a processor, and further comprising the computer-readable storage medium according to any one of claims 1 to 6, wherein a computer program stored on the computer-readable storage medium is executable by the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811459967.0A CN109557622B (en) | 2018-11-30 | 2018-11-30 | Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light receiving device using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811459967.0A CN109557622B (en) | 2018-11-30 | 2018-11-30 | Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light receiving device using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109557622A CN109557622A (en) | 2019-04-02 |
| CN109557622B true CN109557622B (en) | 2020-08-04 |
Family
ID=65868415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811459967.0A Active CN109557622B (en) | 2018-11-30 | 2018-11-30 | Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light receiving device using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109557622B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104421B (en) * | 2020-08-21 | 2021-11-16 | 武汉光迅科技股份有限公司 | Coupling parameter determination method and device, storage medium and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684794A (en) * | 2012-06-06 | 2012-09-19 | 苏州旭创科技有限公司 | Novel wavelength division multiplexing demultiplexing optical assembly applied to high-speed parallel long-distance transmission |
| CN104076450A (en) * | 2013-03-28 | 2014-10-01 | 福州高意通讯有限公司 | BOSA (Bi-Di Optical Subassembly) optical structure used for high-speed receiving and transmitting system |
| CN104079356A (en) * | 2013-03-28 | 2014-10-01 | 福州高意通讯有限公司 | Wavelength division multiplexing and demultiplexing optical structure |
| CN105759371A (en) * | 2016-01-07 | 2016-07-13 | 武汉电信器件有限公司 | Parallel transmitting and receiving optical module for dual-link transmission and making method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10128974B2 (en) * | 2014-06-12 | 2018-11-13 | Sumitomo Electric Industries, Ltd. | Optical receiver module and process to assemble optical receiver module |
-
2018
- 2018-11-30 CN CN201811459967.0A patent/CN109557622B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684794A (en) * | 2012-06-06 | 2012-09-19 | 苏州旭创科技有限公司 | Novel wavelength division multiplexing demultiplexing optical assembly applied to high-speed parallel long-distance transmission |
| CN104076450A (en) * | 2013-03-28 | 2014-10-01 | 福州高意通讯有限公司 | BOSA (Bi-Di Optical Subassembly) optical structure used for high-speed receiving and transmitting system |
| CN104079356A (en) * | 2013-03-28 | 2014-10-01 | 福州高意通讯有限公司 | Wavelength division multiplexing and demultiplexing optical structure |
| CN105759371A (en) * | 2016-01-07 | 2016-07-13 | 武汉电信器件有限公司 | Parallel transmitting and receiving optical module for dual-link transmission and making method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109557622A (en) | 2019-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107430284B (en) | Virtual and augmented reality systems and methods with improved diffraction grating structures | |
| CN103969769B (en) | The method for assembling transmitter optical subassembly | |
| US11692689B2 (en) | Light output system with reflector and lens for highly spatially uniform light output | |
| WO2016153879A1 (en) | Light combiner for augmented reality display systems | |
| US11606472B2 (en) | Projection device and spatial imaging method | |
| CN109613664B (en) | Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light emitting device using same | |
| CN107003488A (en) | Optical receptacle and optical transceiver | |
| CN109683254B (en) | Computer readable storage medium and collimating lens coupling device of four-channel wavelength division multiplexing light receiving device using the same | |
| CN109557622B (en) | Computer readable storage medium and laser coupling device of four-channel wavelength division multiplexing light receiving device using same | |
| CN103252575A (en) | Optical transmission method and system for laser material machining | |
| TW201830071A (en) | Optical waveguide member and optical coupling structure | |
| CN205139431U (en) | Novel single fiber three -dimensional optical assembly device | |
| CN108551372A (en) | A kind of multi-wavelength spatial offset division wave module and optical module | |
| CN204575959U (en) | With the lll night vision that digital picture exports | |
| GB1570001A (en) | Manufacturing optical fibre connectors | |
| CN208506305U (en) | A kind of multi-wavelength multiplex optical module | |
| CN107579412B (en) | High-power optical fiber laser beam combiner | |
| CN208424374U (en) | A kind of light emission system of coarse wavelength division multiplexing fixed-focus parallel light path | |
| CN208351060U (en) | A kind of multi-wavelength spatial offset division wave module and optical module | |
| CN106802485A (en) | A kind of eyepiece for head mounted display | |
| CN203241570U (en) | Prismatic loopback type fixed optical fiber attenuator | |
| CN103048787A (en) | Array type wide-temperature laser module | |
| CN111562686B (en) | Space light self-adaptive coupling device based on crystal electro-optic effect | |
| CN219435081U (en) | Folding waveguide piece assembly and folding AR eyepiece | |
| CN219936204U (en) | Optical system for imaging by utilizing optical fibers and augmented reality equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 523870 No. 2 Fukang Road, Sha Community, Chang'an Town, Dongguan City, Guangdong Province Patentee after: Guangdong Zhaochi Ruigu Communication Co.,Ltd. Country or region after: China Address before: 523870 No. 2 Fukang Road, Sha Community, Chang'an Town, Dongguan City, Guangdong Province Patentee before: GUANGDONG RUIGU OPTICAL NETWORK COMMUNICATION Co.,Ltd. Country or region before: China |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20240628 Address after: 518000, Building B, Building 1303, Phase II, Zhaochi Innovation Industrial Park, No. 128 Bulan Road, Xialilang Community, Nanwan Street, Longgang District, Shenzhen, Guangdong Province Patentee after: Shenzhen Zhaochi Ruigu Technology Co.,Ltd. Country or region after: China Address before: 523870 No. 2 Fukang Road, Sha Community, Chang'an Town, Dongguan City, Guangdong Province Patentee before: Guangdong Zhaochi Ruigu Communication Co.,Ltd. Country or region before: China |