USRE48029E1 - WDM multiplexing/de-multiplexing system and the manufacturing method thereof - Google Patents
WDM multiplexing/de-multiplexing system and the manufacturing method thereof Download PDFInfo
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- USRE48029E1 USRE48029E1 US15/698,580 US201715698580A USRE48029E US RE48029 E1 USRE48029 E1 US RE48029E1 US 201715698580 A US201715698580 A US 201715698580A US RE48029 E USRE48029 E US RE48029E
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Classifications
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- 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
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/123—The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power
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- 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
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
-
- 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
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
- G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
- G02B6/29365—Serial cascade of filters or filtering operations, e.g. for a large number of channels in a multireflection configuration, i.e. beam following a zigzag path between filters or filtering operations
- G02B6/29367—Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer
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- 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
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
- G02B6/425—Optical features
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49004—Electrical device making including measuring or testing of device or component part
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49764—Method of mechanical manufacture with testing or indicating
- Y10T29/49769—Using optical instrument [excludes mere human eyeballing]
Definitions
- the present invention relates to a photoelectric conversion component in fiber optic data communications and telecommunications.
- embodiments of the present invention pertain to a wavelength division multiplexing (WDM; e.g., a coarse wavelength division multiplexing [CWDM]/de-multiplexing system and a manufacturing method thereof.
- WDM wavelength division multiplexing
- CWDM coarse wavelength division multiplexing
- Coarse wavelength division multiplexing is a technology that multiplexes multiple optical signals on a single optical fiber strand by using different wavelengths of laser light to carry different signals.
- CWDM Coarse wavelength division multiplexing
- One conventional CWDM system is formed by single wavelength optical communication modules using an external multiplexer/demultiplexer (MUX/DEMUX).
- MUX/DEMUX external multiplexer/demultiplexer
- the other conventional CWDM system realizes zigzag optical path actions of the MUX/DEMUX using injection molded plastic optical devices and thin film filters.
- Such conventional techniques provide low cost and low power consumption. However, there are some issues with these conventional techniques.
- FIG. 1 is a diagram showing a conventional MUX/DEMUX system 100 having a “zigzag” optical path.
- MUX/DEMUX systems 100 having the zigzag optical path light from an optical source providing multiple wavelengths enters into an optical input port 102 . Subsequently, the wavelengths are separated to each output port in optical module 101 by wavelength to realize de-multiplexing. Because the de-multiplexing process is reversible, four or more light beams having different wavelengths may be combined into one output light beam in the multiplexing process.
- FIG. 2 is a diagram showing a conventional MUX/DEMUX component 200 .
- FIG. 3 is a diagram showing the internal optical path 215 of the component 200 of FIG. 2 .
- the optical module 201 implements multiplexing/de-multiplexing using the zigzag optical path 215 .
- the conventional MUX/DEMUX system 200 may realize a smaller size, lower cost, and easier insertion and/or extraction of the optical fiber in comparison with system 100 of FIG. 1 .
- FIG. 4 shows a layout of a printed circuit board (PCB) 209 having an electrical circuit 211 adapted for relatively long conventional plastic optical devices. Typically, relatively long electrical circuits negatively affect the transmission performance of high speed digital signals.
- PCB printed circuit board
- a lens array having an arrangement parallel with incident light can affect the transmission performance of high speed digital electrical signals at the back-end of a fiber-optic communication device.
- the accumulated tolerances of positioning of various devices such as the collimator and the MUX/DEMUX system can prevent collimated light beams from the collimator being aligned properly with lenses in the plastic optical device.
- conventional MUX/DEMUX systems may have a relatively low yield.
- Embodiments of the present invention are intended to provide a WDM (e.g., CWDM) multiplexing/de-multiplexing system and a manufacturing method thereof to overcome one or more of the issues with conventional MUX/DEMUX systems.
- WDM e.g., CWDM
- the present invention provides a WDM (e.g., CWDM) multiplexing/de-multiplexing system, comprising (i) a de-multiplexer configured to separate and guide first light beams from an incident ray having a plurality of wavelengths to corresponding lenses on an optical device, (ii) a multiplexer configured to combine and guide second light beams from a plurality of optical transmitters, each such second light beam having a unique wavelength that passes through a corresponding lens on the optical device, wherein the multiplexer and the de-multiplexer together form a bi-directional optical subassembly (BOSA), (iii) an array of the corresponding lenses, to receive the first light beams from the demultiplexer and transmit the second light beams to the multiplexer, and (iv) a light-beam collimator configured to function or work with the multiplexer and de-multiplexer.
- a WDM e.g., CWDM
- a de-multiplexer configured to separate and guide first
- a light beam received or transmitted by the light-beam collimator and a light beam from or to the multiplexer/de-multiplexer are collinear.
- a transimpedance amplifier (TIA) array on a printed circuit board (PCB) can have the shortest wiring length to connect with the electrical connector on the PCB.
- the lens array orientation is perpendicular to the light beam transmitted from or received by the light-beam collimator.
- the multiplexer/de-multiplexer and the light-beam collimator are on or in the same plastic optical device, which has a molded lens array thereon.
- the lens array is integrated into the plastic optical device.
- the plastic optical device is molded by injection molding.
- the lens array comprises at least two lenses.
- the lens array comprises four lenses.
- the lenses are equally spaced at fixed intervals (for example, 750 microns, but not limited to 750 microns). The interval between the lenses may be based on the number of lenses and the actual demand.
- the lens array is accompanied by alignment holes in accordance with an applicable fiber patchcord (e.g., an optical fiber ribbon and/or cable) specification.
- Corresponding fiber patchcords have alignment pins corresponding to the alignment holes.
- the fiber patchcord is a mechanical transfer (MT) fiber patchcord.
- MT mechanical transfer
- the present invention further provides a method of manufacturing the WDM (e.g., CWDM) multiplexing/de-multiplexing system, comprising: (i) matching the alignment pins on a fiber patchcord (e.g., an optical fiber ribbon or cable) with the alignment holes in a plastic optical device, and using the fiber patchcord to connect the lens array in the plastic optical device with one or more optical power meters (in one example, the number of fibers in the patchcord corresponds to the number of lenses in the lens array); (ii) positioning a multiplexer/de-multiplexer and a light-beam collimator in the plastic optical device; (iii) changing relative positions of the light-beam collimator and the multiplexer/de-multiplexer until each optical power meter detects a standard or predetermined optical output power level.
- a fiber patchcord e.g., an optical fiber ribbon or cable
- the present invention further concerns an optical receiving device, comprising the WDM and/or CWDM multiplexing/de-multiplexing system, an optical receiving portion, and an electrical circuit.
- the optical receiving portion is configured to function or work with the lens array in the WDM and/or CWDM multiplexing/dc-multiplexing system.
- the optical receiving portion comprises an optical detector array.
- the present invention relates to an optical transmitting device, comprising the WDM and/or CWDM multiplexing/de-multiplexing system, an optical transmitting portion and an electrical circuit, wherein a light beam that is emitted from the optical transmitting portion is captured by the lens array of the WDM and/or CWDM multiplexing/de-multiplexing system.
- the present invention further relates to an optical transmitting-receiving device, comprising the WDM and/or CWDM multiplexing/de-multiplexing system, an optical receiving portion, an optical transmitting portion, and an electrical circuit.
- the optical transmitting-receiving device comprises the present WDM and/or CWDM multiplexing/de-multiplexing system, wherein a light beam that is emitted from the optical transmitting portion is captured by a part of the lens array, and the light beam that is emitted from the other part of the lens array is received by the optical receiving portion.
- the optical transmitting portion comprises a surface emitting laser array or an edge-emitting laser array
- the optical receiving portion comprises an optical detector array.
- the plastic optical device has precise alignment holes in locations (e.g., sides) where the lens array is positioned.
- active optical power monitoring is provided by connecting the MT fiber patchcord to the optical power meters.
- the present invention advantageously enables positioning the light-beam collimator and the multiplexer/de-multiplexer to fit predetermined or designed positions. From a technical point of view, manufacturing lenses and alignment holes with precise positions and sizes is relatively mature technology and can be applied in this invention.
- the present invention advantageously:
- the present invention provides a molded plastic optical device with a unique assembly procedure for a receiver (e.g., a 40 G/100 G receiver) optical subassembly.
- a mechanical transfer (MT) based guiding structure functions as the detector array during the assembly process.
- the light-beam collimator and the DEMUX can be aligned to a predetermined or designed position through the active alignment method.
- This is a benefit from designing the MT-based guide or alignment holes in the plastic optical device.
- a passive alignment method through the alignment mechanism can be applied, and the MT-based patchcord may simulate the optical detector array for the active alignment of the zigzag type DEMUX and the light-beam collimator.
- FIG. 1 is a diagram showing a conventional multiplexer/de-multiplexer (MUX/DEMUX) system.
- FIG. 2 is a diagram showing a conventional plastic molded MUX/DEMUX system.
- FIG. 3 is a diagram showing an internal optical path of the MUX/DEMUX in FIG. 2 .
- FIG. 4 shows a layout of a printed circuit board (PCB) having an electrical circuit (including traces) adapted for a conventional optical detector arrangement.
- PCB printed circuit board
- FIG. 5 is a diagram showing connections among various components, such as the optical device, a light-beam collimator, and a MUX/DEMUX.
- FIG. 6 is a perspective view showing alignment holes in an example of the present plastic optical device, aligned with the alignment pins on a mechanical transfer (MT) fiber patchcord.
- MT mechanical transfer
- FIG. 7 is a drawing showing the setup and/or use of a MT-based fiber patchcord to simulate the optical detector array and then measure the optical power level of each DEMUXed wavelength by each individual power meter through the MT-based fiber patchcord.
- FIG. 8 is a side view showing the setup between the MT-based fiber patchcord and a plastic optical device in accordance with the present invention.
- FIG. 9 is a diagram showing the assembly of the plastic optical device aligned with a PCB in accordance with the present invention.
- FIG. 10 is an exemplary layout showing a PCB electrical circuit (including traces) adapted for the present plastic optical device.
- the present WDM (e.g., CWDM system) 300 comprises a plastic optical device 301 , a collimator 302 connected to the front end of the plastic optical device 301 , a MUX/DEMUX 303 mounted on the plastic optical device 301 , and a lens array 308 configured to receive light from the MUX/DEMUX 303 and/or transmit light to the MUX/DEMUX 303 .
- Light received or transmitted by the collimator 302 and light from or to the MUX/DEMUX 303 are collinear.
- the present WDM system and assembly process may further comprise a mechanical transfer (MT) fiber patchcord or cable 304 having two alignment pins 305 , optical power meters 314 ( FIG. 7 ) connected to the MT fiber patchcord 304 via an optical fiber 307 , and two alignment holes 306 on the surface of the plastic optical device 301 .
- MT mechanical transfer
- the MT fiber patchcord 304 is utilized to simulate the optical detector array as an intermediate process during the assembly among the collimator, the plastic optical device, and the MUX/DEMUX.
- injection molded plastic optical device 301 functions as a base, holder, or frame for the MUX/DEMUX 303 and the collimator 302 .
- Light having various wavelengths transmitted from the DEMUX 303 can be guided to corresponding lenses in the lens array 308 in or on the plastic optical device 301 , as shown in FIG. 9 .
- the lens array 308 comprises lenses that are spaced apart by, e.g., 750 microns.
- the lens array 308 is compatible with the four optical detectors 312 , followed by the transimpedance amplifier (TIA) array 313 , at the back end 315 of the plastic optical device 301 , as shown in FIG. 10 FIGS. 9-10.
- TIA transimpedance amplifier
- the orientation of the optical detector array 312 , the transimpedance amplifier (TIA) array 313 , and the electrical metal lines are substantially parallel at the back end 316 of the optical device 301 PCB.
- This arrangement allows the output from the TIA array 313 , which are behind the optical detector array 312 , to be transmitted to an electrical cable (e.g., connected to a host device) on the PCB 309 at the back end 316 via relatively short electrical metal lines or traces 310 .
- FIG. 4 which is an exemplary layout showing a PCB 209 having an electrical circuit arrangement 211 adapted for conventional plastic optical devices
- the metal lines or traces in this electrical circuit arrangement 211 are relatively long.
- long electrical metal lines or traces negatively affect the transmission performance of high speed digital signals. Distortion due to long transmission traces (such as in the layout in FIG. 4 ) when using optical detector array 212 accompanying with the TIA array 213 to convert optical signals into high speed digital electrical signals may be reduced by implementing the layout and/or circuitry shown in FIG. 10 .
- two alignment holes 306 that are compatible or mated with the alignment pins 305 on the MT fiber patchcord or cable 304 are applied to and/or formed in the plastic optical device 301 .
- a MT fiber ribbon formed from four single-mode or multi-mode fibers 307 may be connected to four individual optical power meters 314 , as shown in FIG. 7 .
- the fiber 307 is connected with the optical power meter 314 to monitor the optical power level during the assembly process.
- the fibers 307 in the MT fiber patchcord 304 can passively align with the lens array 308 on the plastic optical device 301 to receive light from the MUX/DEMUX 303 with the greatest coupling efficiency through the active alignment method.
- the relative positions of the collimator 302 and the MUX/DEMUX 303 may be changed or adjusted until each optical power meter 314 detects a predetermined, specified and/or standardized optical output power level.
- the collimator 302 and MUX/DEMUX 303 may be fixed to the plastic optical device 301 with a UV adhesive.
- the light-beam collimator 302 and the MUX/DEMUX 303 are mounted in adjustable locations on the device 301 , then the optimal locations are determined using the optical power meter(s), and the locations of 302 and 303 are secured using UV adhesive when the optimal locations are determined.
- the accumulated tolerances of positioning various devices in the WDM and/or CWDM system may prevent collimated light beams from the collimator 302 from properly passing through the lenses in plastic optical device 301 during the assembly of the plastic optical device 301 , the collimator 302 , and the MUX/DEMUX 303 .
- conventional WDM and/or CWDM systems may result in relatively low yields.
- positioning the pins 305 on the MT fiber patchcord to align or match up with the alignment holes 306 in the plastic optical device 301 provides adequate alignment of the collimator 302 and the MUX/DEMUX 303 in predetermined or designed positions.
- collimated light from the collimator 302 can be guided to the lens array 308 on the plastic optical device 301 , which advantageously reduces the energy loss of the optical signal, thus increasing the yield.
- the introduction of the alignment holes 306 on the plastic optical device 301 can simplify the alignment process of the collimator 302 and the MUX/DEMUX 303 through active alignment skill. Similarly, it can be used in manufacturing process of a transmitter optical subassembly (TOSA) and a bi-directional optical subassembly (BOSA).
- TOSA transmitter optical subassembly
- BOSA bi-directional optical subassembly
- the optical receiving portion is the optical detector array 312
- the optical transmitting portion is a surface emitting laser array or edge-emitting laser array (not shown).
- the present WDM and/or CWDM multiplexing/de-multiplexing system employs the MT fiber patchcord 304 with optical power meters 314 to align the collimator 302 , the WDM and/or CWDM MUX/DEMUX 303 to the predetermined or designed positions on the optical device 301 .
- Various embodiments of WDM and/or CWDM systems with alignment pins aligning to the alignment holes via precise molds and corresponding devices may be used and are within the scope of the present invention.
- the present invention provides a WDM multiplexing/de-multiplexing system (e.g., a CWDM multiplexing/de-multiplexing, system), and manufacturing method thereof.
- the WDM and/or CWDM multiplexing/de-multiplexing system comprises (i) a de-multiplexer configured to separate and guide light beams from an incident ray having a plurality of wavelengths to corresponding lenses on the optical device, (ii) a multiplexer configured to combine and guide light beams from a plurality of optical transmitters, the light beams having a plurality of wavelengths and passing through the corresponding lenses on the optical device, wherein the multiplexer and the de-multiplexer together form a bi-directional optical subassembly (BOSA), (iii) a lens array comprising the corresponding lenses to receive the light beams from and transmit the light beams to the de-multiplexer and multiplexer, and (iv) a light-beam collimator configured to function or work with the multiplexer
- a light beam received or transmitted by the light-beam collimator and a light beam from or to the multiplexer/de-multiplexer are collinear.
- the light-beam collimator and the multiplexer/de-multiplexer can be easily positioned to the predetermined or designed positions through the introduction of alignment holes in the plastic optical device, a MT-based patchcord with optical power meters, and active alignment skill.
- a patchcord with alignment pins can match up with the alignment holes to simulate the optical detector array in situ.
- the present WDM and/or CWDM system advantageously reduces optical signal loss and increases the assembly yield.
Abstract
Description
-
- (i) enables the optical design to reduce the length of the electrical transmission path of high speed digital signals on the PCB;
- (ii) provides an easier manufacturing process with the introduction of the alignment holes on the plastic optical device and an MT fiber patchcord;
- (iii) reduces the optical power loss of the optical signal caused by misalignment during assembly and increases the yield by introducing precise alignment holes accompanying the plastic lens array; and
- (iv) provides active optical power monitoring by connecting the MT fiber patchcord to the corresponding optical power meter, thereby positioning the light-beam collimator and the multiplexer/de-multiplexer to fit predetermined or designed positions in the present plastic optical device.
Claims (30)
Priority Applications (1)
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US15/698,580 USRE48029E1 (en) | 2012-10-22 | 2017-09-07 | WDM multiplexing/de-multiplexing system and the manufacturing method thereof |
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CN201210402718.4A CN102890313B (en) | 2012-10-22 | 2012-10-22 | CWDM (Coarse Wavelength Division Multiplexing) multiplexer/demultiplexer system and manufacturing method thereof |
CN201210402718 | 2012-10-22 | ||
US13/735,735 US9229167B2 (en) | 2012-10-22 | 2013-01-07 | WDM multiplexing/de-multiplexing system and the manufacturing method thereof |
US15/698,580 USRE48029E1 (en) | 2012-10-22 | 2017-09-07 | WDM multiplexing/de-multiplexing system and the manufacturing method thereof |
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US13/735,735 Reissue US9229167B2 (en) | 2012-10-22 | 2013-01-07 | WDM multiplexing/de-multiplexing system and the manufacturing method thereof |
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US15/698,580 Active 2033-02-27 USRE48029E1 (en) | 2012-10-22 | 2017-09-07 | WDM multiplexing/de-multiplexing system and the manufacturing method thereof |
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Also Published As
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CN102890313A (en) | 2013-01-23 |
US9229167B2 (en) | 2016-01-05 |
CN102890313B (en) | 2015-07-15 |
US20140112618A1 (en) | 2014-04-24 |
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