WO2021232925A1 - Procédé de réglage de lcos, dispositif optique et multiplexeur à insertion-extraction optique reconfigurable - Google Patents

Procédé de réglage de lcos, dispositif optique et multiplexeur à insertion-extraction optique reconfigurable Download PDF

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Publication number
WO2021232925A1
WO2021232925A1 PCT/CN2021/081985 CN2021081985W WO2021232925A1 WO 2021232925 A1 WO2021232925 A1 WO 2021232925A1 CN 2021081985 W CN2021081985 W CN 2021081985W WO 2021232925 A1 WO2021232925 A1 WO 2021232925A1
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Prior art keywords
grating
region
light spot
distribution
boundary line
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PCT/CN2021/081985
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English (en)
Chinese (zh)
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毛磊
宗良佳
常泽山
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华为技术有限公司
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Publication of WO2021232925A1 publication Critical patent/WO2021232925A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/30—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 grating
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/05—Function characteristic wavelength dependent

Definitions

  • This application relates to the field of optical communications, and in particular to liquid crystal on silicon (LCOS) adjustment methods, optical devices, and reconfigurable optical add/drop multiplexers.
  • LCOS liquid crystal on silicon
  • LCOS is a very small matrix liquid crystal device based on the reflection mode. This type of matrix liquid crystal device is fabricated on silicon chips using complementary metal oxide semiconductor (CMOS) technology.
  • CMOS complementary metal oxide semiconductor
  • FIG. 1 In optical devices that use phase-adjusted optical signals, such as wavelength selective switches (WSS) or dynamic gain flatness filters (DGFF), usually include LCOS.
  • the working principle of LCOS is to load different voltages on different pixels of the LCOS. Due to the birefringence effect of the liquid crystal, different voltages will correspond to different phase retardations, thereby forming a structure similar to a grating.
  • a grating as shown in FIG. 1 can be formed. As shown in FIG. 1, FIG. 1 includes a raster front view 101 and a raster left view 102.
  • the periodic grating 103 is one period of the grating.
  • the periodic grating 103 has a phase with the Y axis. After the beam 104 perpendicular to the Y axis irradiates the blazed grating, because the blazed grating has a phase, the beam 104 will be reflected back at an angle different from the incident angle to form a reflected beam 105. It can also be understood that the beam 104 is deflected in the Y-axis direction.
  • the grating formed by the LCOS will generate a reflected light beam in a different direction from the reflected light beam 105, causing crosstalk.
  • This application provides an LCOS adjustment method, an optical device and a reconfigurable optical add/drop multiplexer, which can reduce crosstalk.
  • the first aspect of the present application provides an LCOS adjustment method, including: a controller adjusts the boundary line of the grayscale distribution of the grating in the first region so that the first light spot covers the boundary line of the grayscale distribution of the grating as little as possible.
  • the boundary line of the gray scale distribution of the grating refers to the boundary line of the gratings of different periods in the port direction, and is referred to as the boundary line of the grating hereinafter.
  • the boundary line of the grating In the port direction of the LCOS, there are two boundary lines between a periodic grating and two adjacent periodic gratings. Adjusting the boundary line of the grating means that in the first area, the boundary line of part or all of the gratings is shifted in the port direction.
  • LCOS the grayscale distribution of the grating is loaded.
  • different voltages can be applied to different pixels of the LCOS. Due to the birefringence effect of the liquid crystal, different voltages will correspond to different phase retardations, thereby forming a structure similar to a grating.
  • LCOS includes K ⁇ H areas, K points to the port direction of LCOS, K is an integer greater than 0, H points to the wavelength direction of LCOS, and H is an integer greater than 1.
  • the first area is one of K ⁇ H areas. After the first optical signal is incident on the first area of the LCOS, the first area is used to redirect the first optical signal, such as reflection or transmission, and a first light spot is formed in the first area.
  • different regions can have different grayscale distributions of the grating. Because H is an integer greater than 1, there are at least 2 regions in the wavelength direction of the LCOS.
  • the boundary line of the grating will produce crosstalk.
  • the controller adjusts the boundary line of the gratings in the first area so that the first light spot covers the boundary line of the gratings as little as possible, so that crosstalk can be reduced.
  • the controller before adjusting the boundary line of the grating in the first region, the controller first obtains the first intensity value of the first optical signal, and the first intensity The value is the power of the first optical signal after redirection. After adjusting the boundary line of the grating in the first region, the controller obtains a second intensity value of the first optical signal, where the second intensity value is the power of the first optical signal after redirection. If the second intensity value is greater than the first intensity value, the first light spot covers as few border lines of the grating as possible.
  • the first intensity value may be a target intensity value or a crosstalk intensity value.
  • the target intensity value refers to the power of the first optical signal output by the first optical signal from the target output port
  • the crosstalk intensity value refers to the negative value of the power of the first optical signal output by the first optical signal from the non-target output port.
  • the target output port refers to a port where the first optical signal is expected to be output
  • the non-target output port refers to a port where the first optical signal generates crosstalk.
  • the power of the first optical signal output by the target output port is generally greater than the power of the first optical signal output by the non-target output port.
  • a positioning sensor needs to be installed in the LCOS to obtain the start position and end position of the first spot in the port direction, and it needs to be calculated between the start position and the end position.
  • the number of junction lines Compared with the above technical means, it is simpler to judge whether the first light spot covers the boundary line of the grating as little as possible by the intensity value of the first light signal, and the cost is reduced.
  • the intensity value of the first light signal can be measured by an intensity sensor, which is simpler to implement than a positioning sensor.
  • the intensity sensor does not need to be installed on the LCOS, so one intensity sensor can measure multiple LCOS and reduce costs.
  • the controller adjusts the boundary line of the grating in the first region so that the center of the first light spot
  • the distance between the line and the center line of the gray distribution of a periodic grating in the first region is less than A/4, where A is the half-height width of the first light spot.
  • the center line of the first light spot is the center line of the first light spot perpendicular to the port direction.
  • the first optical signal is incident on the LCOS, and in the port direction, the energy of the first optical signal is symmetrically distributed along a straight line, and this straight line is the center line of the first light spot.
  • the center line of the first spot will fall within a certain periodic grating in the first area.
  • the center line of the gray distribution of a periodic grating refers to the position of the periodic grating in the port direction equal to (X+Y)/2, and X is The position of the minimum phase of the periodic grating, and Y is the position of the maximum phase of the periodic grating.
  • the boundary line of the grating will produce crosstalk.
  • the boundary line of the grating in the first area is adjusted by the controller, so that the distance between the center line of the first spot and the gray distribution center line of a periodic grating is less than A/4, so it can Reduce crosstalk.
  • the controller passes along the LCOS
  • the port direction shifts the gray distribution of the grating in the first region to adjust the boundary line of the grating.
  • the gray distribution of the translational grating means that the different phases of the periodic grating have the same shift along the port direction without changing the period of the periodic grating.
  • the redirection angle of the first light signal will not change, that is, the target output port corresponding to the first area will not change.
  • the redirection angle of the first optical signal refers to the angle of the first optical signal before the redirection and the first optical signal after the redirection.
  • the controller can adjust the For the period of the gray distribution of the grating in a region, the controller may also adjust the maximum phase of the gray distribution of the grating in the first region, so that the redirection angle of the first light signal remains unchanged.
  • the period of the gray distribution of the grating is referred to as the period of the grating
  • the maximum phase of the gray distribution of the grating is referred to as the maximum phase of the grating.
  • the controller adjusts the boundary line of the grating by adjusting the period and maximum phase of the grating in the first region, which can not only keep the redirection angle of the first light signal unchanged, but also when the first period is less than the second period,
  • the number of targets can be further reduced, and when the first period is greater than the second period, the sensitivity of the first optical signal can also be reduced.
  • the number of targets is the number of boundary lines of the grating covered by the first light spot.
  • the first period is the period of the grating in the first area before the controller adjusts the period of the grating in the first area.
  • the second period is the period of the grating in the first area after the controller adjusts the period of the grating in the first area.
  • the first light spot formed by the first optical signal covers the less periodic grating, and the more sensitive the first optical signal is, and the more easily the power of the first optical signal output from the target output port fluctuates up and down.
  • the sensitivity of the first optical signal will be improved.
  • the power of the first optical signal output from the target output port can be maintained at a better value.
  • the boundary line of the grating in the first region is adjusted so that the first light spot matches a periodic grating in the first region.
  • Matching refers to making the first light spot overlap with a periodic grating in the first region as much as possible. If the height of the first light spot is less than the height of the gray distribution of a periodic grating in the first region, the boundary line of the grating in the first region is adjusted so that the first light spot is within a periodic grating in the first region.
  • the controller adjusts the profile coefficient of the gray scale distribution of the grating in the first region to obtain the third intensity value.
  • the first intensity value is the power of the first optical signal after redirection
  • the third intensity value is obtained after adjusting the topography coefficient of the grayscale distribution of the grating in the first region
  • the third intensity value is greater than the second intensity
  • the profile coefficient of the gray scale distribution of the grating is referred to as the profile coefficient of the grating.
  • the third intensity value can also be the target intensity value or the crosstalk intensity value.
  • the third intensity value is the target intensity value; if the second intensity value is the crosstalk intensity value, then the third intensity value Is the crosstalk intensity value.
  • the controller also adjusts the The boundary line of the gratings in the two regions, so that the second light spot covers the boundary line of the grating as little as possible.
  • the second area is one of the K ⁇ H areas of the LCOS, the second area is the area where the second light signal forms the second light spot, and the second area can redirect the second light signal.
  • the center line of the second light spot is different from the center line of the first light spot, that is, the first area and the second area belong to different areas in the port direction.
  • K is an integer greater than 1, and the first optical signal and the second optical signal belong to Input optical signals from different input ports.
  • Reducing the height of the first light spot in the port direction will make the period of the grating covered by the first light spot less, that is, make the first light signal more sensitive.
  • the power of the first optical signal output from the target output port will fluctuate more easily.
  • the boundary line of the grating the power of the first optical signal output from the target output port can tend to To stabilize, that is, to reduce the sensitivity of the first optical signal.
  • the boundary lines of the gratings are adjusted so that the first light spot covers fewer boundary lines of the gratings, the power of the first optical signal output from the target output port can be maintained at a better value.
  • the controller also adjusts the The boundary line of the gratings in the three regions, so that the third light spot covers the boundary line of the grating as little as possible.
  • the third area is one of the K ⁇ H areas of the LCOS, the third area is the area where the third optical signal forms the third light spot, and the third area can redirect the third optical signal.
  • the center line of the third light spot is the same as the center line of the first light spot, that is, the first optical signal and the third optical signal belong to the input optical signals of the same input port, and the wavelength ranges of the first optical signal and the third optical signal are different.
  • the first region and the third region can individually adjust the boundary line of the grating, so that the adjustment of the first region or the third region does not affect each other.
  • the first light spot is flat Top spot.
  • the energy distribution of the flat-top light spot in the port direction is relatively even. Therefore, the flat-top light spot needs to pay attention to the number of boundary lines of the grating covered by the entire light spot.
  • the second aspect of the present application provides an optical device.
  • the optical device includes a first input port, a first output port, a dispersive element and an LCOS.
  • the first input port is used for incident the first incident optical signal to the dispersive element.
  • the dispersive element is used to decompose the first incident optical signal into a first optical signal group of optical signals with different wavelengths, and transmit the first optical signal group to the LCOS, in which the grayscale distribution of the grating is loaded.
  • different voltages can be applied to different pixels of the LCOS. Due to the birefringence effect of the liquid crystal, different voltages will correspond to different phase retardations, thereby forming a structure similar to a grating.
  • LCOS includes K ⁇ H areas, K points to the port direction of LCOS, K is an integer greater than 0, H points to the wavelength direction of LCOS, and H is an integer greater than 1.
  • the first area in the K ⁇ H areas is the area where the first light signal forms the first light spot, and the first light signal belongs to the first light signal group.
  • the boundary lines of the gratings in the first region are configured such that the first light spot covers the boundary lines of the grayscale distribution of the gratings as little as possible.
  • LCOS is used to redirect the first optical signal, and transmit the redirected first optical signal to the first output port.
  • the boundary line of the grating will produce crosstalk.
  • the boundary lines of the gratings in the first region in the LCOS are configured so that the first light spot covers the boundary lines of the gratings as little as possible, so the optical device including the LCOS can reduce crosstalk.
  • the boundary line of the grating in the first region is configured so that the first light spot covers the boundary of the grating as little as possible Line:
  • the second intensity value is greater than the first intensity value.
  • the first intensity value is the power of the first optical signal passing through the first output port before the boundary line of the grating in the first region is configured.
  • the second intensity value is the power of the first optical signal passing through the first output port after the boundary line of the grating in the first region is configured.
  • the first intensity value may be a target intensity value or a crosstalk intensity value. When the first output port is the target output port, the first intensity value is the target intensity value.
  • the first intensity value is the crosstalk intensity value.
  • the target output port refers to a port where the first optical signal is expected to be output
  • the non-target output port refers to a port where the first optical signal generates crosstalk.
  • the power of the first optical signal output by the target output port is generally greater than the power of the first optical signal output by the non-target output port.
  • the boundary line of the grating in the first region is configured such that the center line of the first light spot The distance from the center line of the gray distribution of a periodic grating in the first region is less than A/4, where A is the half-height width of the first light spot.
  • the center line of the first light spot is the center line of the first light spot in the port direction.
  • the first optical signal is incident on the LCOS, and in the port direction, the energy of the first optical signal is symmetrically distributed along a straight line, and this straight line is the center line of the first light spot.
  • the center line of the first spot will fall within a certain periodic grating in the first area.
  • the center line of the gray distribution of a periodic grating refers to the position where the port direction of the periodic grating is equal to (X + Y)/2, and X is The position of the minimum phase of the periodic grating, and Y is the position of the maximum phase of the periodic grating.
  • the grating in the first region The boundary line of is configured such that the boundary line of the grayscale distribution of the grating with as little coverage as possible by the first light spot is obtained by translating the grayscale distribution of the grating in the first region along the port direction.
  • the gray distribution of the translational grating means that the different phases of the periodic grating have the same shift along the port direction without changing the period of the periodic grating.
  • the first optical signal When the redirection angle of is unchanged, the boundary lines of the gratings in the first area are configured so that the first light spot covers the boundary lines of the gratings as little as possible.
  • the condition that the redirection angle of the first optical signal remains unchanged is obtained after adjusting the period and maximum phase of the grating in the first region.
  • the first light spot is The height is equal to the height of the gray distribution of a periodic grating in the first region, so when the height of the first spot matches the gray distribution of a periodic grating in the first region, the boundary line of the grating in the first region It is configured such that the first light spot covers the boundary line of the grayscale distribution of the grating as little as possible.
  • the height of the first light spot is less than the height of the grayscale distribution of a periodic grating in the first region, then if the first light spot is within the grayscale distribution of a periodic grating in the first region, the boundary of the grating in the first region
  • the lines are arranged so that the first light spot covers the boundary line of the grayscale distribution of the grating as little as possible.
  • the grayscale distribution of the grating in the first region is The topography coefficient is configured such that the third intensity value is greater than the second intensity value.
  • the second intensity value is the power of the optical signal at the first output port before the topography coefficient of the gray scale distribution of the grating in the first region is configured.
  • the third intensity value is the power of the optical signal at the first output port after the profile coefficient of the gray scale distribution of the grating in the first region is configured.
  • the profile coefficient of the gray scale distribution of the grating is referred to as the profile coefficient of the grating.
  • the third intensity value can also be the target intensity value or the crosstalk intensity value. If the second intensity value is the target intensity value, the third intensity value is the target intensity value; if the second intensity value is the crosstalk intensity value, then the third intensity value Is the crosstalk intensity value.
  • the optical device further includes a Two input ports.
  • the second input port is used for incident the second incident optical signal to the dispersive element.
  • the dispersive element is also used to decompose the second incident optical signal into a second optical signal group of optical signals with different wavelengths, and transmit the second optical signal group to the LCOS, where the second area of the K ⁇ H areas is The second light signal forms the area of the second light spot.
  • the second optical signal belongs to the second optical signal group.
  • the center line of the second light spot is different from the center line of the first light spot, that is, the first area and the second area belong to different areas in the port direction, and K is an integer greater than 1.
  • the boundary lines of the gratings in the second region are configured so that the second light spot covers the boundary lines of the grayscale distribution of the gratings as little as possible.
  • LCOS is also used to redirect the second optical signal.
  • the third area is the area where the third light signal forms the third light spot.
  • the third light signal belongs to the first light signal group.
  • the center line of the third light spot is the same as the center line of the first light spot.
  • the wavelength range of the optical signal is different.
  • the boundary lines of the gratings in the third region are arranged so that the third light spot covers the boundary lines of the grayscale distribution of the gratings as little as possible.
  • LCOS is also used to redirect the third optical signal.
  • the first spot is flat Top spot.
  • the third aspect of the present application provides a reconfigurable optical add-drop multiplexer (ROADM).
  • ROADM reconfigurable optical add-drop multiplexer
  • the reconfigurable optical add/drop multiplexer includes: demultiplexer module and multiplexer module.
  • the demultiplexing module is used to download the first optical wavelength signal to the site.
  • the multiplexing module is used to receive the second optical wavelength signal uploaded by the site.
  • the demultiplexing module and/or the multiplexing module is the optical device described in any one of the foregoing second aspect or the second aspect, and the optical device is a wavelength selective switch.
  • a fourth aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on a computer, the computer executes any of the first aspect or the first aspect.
  • the fifth aspect of the present application provides a computer program product, which is characterized in that when the computer program product is executed on a computer, the computer executes the method according to the first aspect or any one of the implementation manners of the first aspect .
  • Figure 1 is a schematic structural diagram of the grayscale distribution of a grating formed by LCOS
  • Figure 2 is another schematic diagram of the grayscale distribution of the grating formed by LCOS
  • FIG. 3 is a schematic diagram of the structure of WSS
  • Figure 4 is a schematic diagram of a structure of DGFF or WE
  • FIG. 5 is a schematic structural diagram of the grayscale distribution of the grating in the first region before adjustment in the embodiment of the application;
  • FIG. 6 is a schematic flow chart of the LCOS adjustment method in an embodiment of the application.
  • FIG. 7 is a schematic diagram of the association between different areas and ports of LCOS in an embodiment of the application.
  • FIG. 8 is a schematic structural diagram of the gray scale distribution of the grating in the first region after adjustment in the embodiment of the application;
  • FIG. 9 is a schematic diagram of the gray scale distribution of the grating under different translation amounts in an embodiment of the application.
  • FIG. 10 is another schematic diagram of the structure of the adjusted gray scale distribution of the grating in the first region in the embodiment of the application.
  • FIG. 11 is a schematic diagram of the gray scale distribution of the grating when the topography coefficient is adjusted in the embodiment of the application;
  • FIG. 13 is a schematic diagram of the energy distribution of the flat top spot in an embodiment of the application.
  • FIG. 14 is a schematic structural diagram of a reconfigurable optical add/drop multiplexer in an embodiment of the application.
  • the embodiments of the present application provide an LCOS adjustment method, an optical device, and a reconfigurable optical add/drop multiplexer, which are applied in the field of optical communication and can reduce crosstalk.
  • LCOS includes many pixels. Different voltages can be applied to the pixels to form different phase delays. When a gradient voltage is applied to a series of continuous pixels, the diffraction effect of the physical grating can be simulated to form the grayscale distribution of the grating. .
  • the gray-scale distribution of the grating is also called the phase distribution.
  • the gray-scale distribution of the grating includes the corresponding relationship between the gradient voltage and the pixel points.
  • the gray scale distribution of the grating includes the period of the grating, the starting point of the period of the grating, and the maximum phase of the grating. Wherein, the starting point of the period of the grating can be understood as the starting point of the pixel point to which the gradient voltage is applied.
  • the boundary line of the grating can refer to the starting point of the grating period or the maximum phase of the grating.
  • the boundary line of the grating will be described in detail later.
  • the maximum phase of the grating generally corresponds to the pixel where the maximum or minimum voltage is applied.
  • the period of the grating refers to the period of the gradient voltage. For example, it includes 100 pixels along the port direction. From the first pixel to the 10th pixel, the applied voltage is 0.1mV to 1mV, and the applied voltage is from the 11th pixel to the 20th pixel. The values are 0.1mV to 1mV, and so on, until the 100th pixel.
  • the gray scale distribution of the raster includes the height from the first pixel to the 10th pixel (the period of the raster), the position of the 10th pixel or the position of the 11th pixel (the boundary line of the raster), and a voltage of 1mV is applied.
  • Time pixel equivalent phase (the maximum phase of the grating). The period of the grating and the maximum phase of the grating work together to determine the tilt angle of the grating.
  • the angle of the incident light signal will be deflected, that is, the LCOS redirects the incident light signal. Divide the LCOS into different areas. If the same gradient voltage is applied to different areas, it can be considered that the inclination angles of the different areas are the same, and the redirection angle of the incident light signal is the same; if different gradient voltages are applied to different areas, then It can be considered that the inclination angle of different areas is different, and the redirection angle of the incident light signal is different.
  • Fig. 2 is a schematic structural diagram of the gray scale distribution of the grating formed by LCOS.
  • Figure 2 includes a front view of the raster and a left view of the raster.
  • the first light spot 210, the third light spot 209, and the fourth light spot 211 are formed by the light signal incident on the LCOS.
  • a periodic grating 203 includes a first grating area 206 and a second grating area 207.
  • the inclination angle of the first grating area 206 is formed according to the applied voltage gradient
  • the inclination angle of the second grating area 207 is formed according to the maximum voltage and the minimum voltage applied. Because the phase of each pixel in the LCOS can be changed in a certain range according to the applied voltage, it is inevitable that there will be a boundary line between the maximum phase and the minimum phase, that is, the boundary line of the grayscale distribution of the grating (can be referred to as The boundary line of the grating).
  • the boundary line of the grating may refer to the second grating area 207. In the drawing method that does not reflect the second grating area 207, the boundary line of the grating can also be understood as the boundary line 106 in FIG. 1.
  • the angle between the reflected optical signal 205 and the optical signal 204 is the first redirection angle.
  • the angle between the reflected optical signal and the optical signal 204 is the second redirection angle.
  • the first redirection angle is different from the second redirection angle, and the reflected light signal that generates the second redirection angle is crosstalk.
  • the LCOS adjustment method in this application adjusts the starting point position of the pixel point to which the gradient voltage is applied, thereby moving the boundary line of the grating, so that the light spot formed by the optical signal covers the boundary line of the grating as little as possible, thereby reducing crosstalk.
  • the LCOS adjustment method in this application can adjust optical devices including LCOS, such as WSS, DGFF, WB, and so on.
  • WSS can switch multi-wavelength optical signals to different ports according to the wavelength to realize wavelength scheduling of communication nodes.
  • Figure 3 is a schematic diagram of the WSS structure.
  • WSS includes multiple ports 301 as input and output of incident light signals. After the incident light signal enters the WSS from the input port, it needs to be split into two light beams with orthogonal polarization states through a crystal or polarization beam splitter (PBS) 302, and then rotate the polarization state of one of the light beams to make The deflection state of the two beams is aligned with the working polarization state of LCOS306. If polarization-independent LCOS 306 is used, no crystal or polarization beam splitter 302 is required.
  • PBS crystal or polarization beam splitter
  • the incident optical signal after polarization conversion is incident on the periodic grating 305 through the lens 304.
  • the periodic grating 305 is a dispersive element.
  • the periodic grating 305 is used to decompose the incident optical signal into optical signals with different wavelengths and transmit the optical signals to the LCOS306. .
  • the grating formed in the LCOS 306 is different from the periodic grating 305.
  • the periodic grating 305 is a physical entity, and the grating formed in the LCOS 306 is an equivalent grating.
  • Optical signals of different wavelengths are emitted from the periodic grating 305 at different angles, and enter different areas of the LCOS 306 after passing through the lens 304.
  • the corresponding wavelength can be controlled to achieve angular deflection in the port direction 308 perpendicular to the wavelength direction 307.
  • the optical signal after the angular deflection is incident on the Fourier lens 303,
  • the inner lens 303 shifts the position of the optical signal, and the optical signal after the position shift is coupled to a specific output port. Controlling the gray scale distribution of the grating in a region of the LCOS306 can realize that the light signals incident on the region are output from different output ports.
  • FIG. 4 is a schematic diagram of the structure of DGFF or WE.
  • the incident optical signal is input into the DGFF or WE from the port 401, collimated by the lens 402, and incident on the dispersive element 403.
  • the dispersive element 403 is used to decompose the incident optical signal into optical signals with different wavelengths.
  • Optical signals of different wavelengths are emitted from the dispersive element 403 at different angles, after passing through the lens 404, are focused on different areas of the LCOS405 along the wavelength direction 406, the LCOS405 reflects the optical signals, and the reflected optical signals return to the port 401.
  • Controlling the grayscale distribution of the gratings in different regions of the LCOS405 can change the deflection angle of the optical signal, so that the reflected path deviates from the incident path, and the output optical signal will be attenuated. The greater the deviation, the greater the attenuation. Controlling the gray distribution of gratings in different regions corresponding to different wavelengths can adjust the attenuation and generate a filtering curve. This is the principle of DGFF.
  • the optical signal will be attenuated greatly, which is equivalent to blocking certain wavelengths; if you control the grayscale distribution of the grating in the area corresponding to certain wavelengths, the optical signal will attenuate Very small, so that certain wavelengths are not attenuated, which is equivalent to passing certain wavelengths.
  • the output port and the input port of the WE are not the same port, and the lens 402 is not required to collimate the incident light signal.
  • the optical device includes LCOS, and the LCOS principle is the same, the use of the LCOS adjustment method disclosed in this application to adjust it should fall within the protection scope of this application.
  • WSS will be taken as an example below to describe it in detail.
  • the LCOS adjustment method in this application involves the grayscale distribution of the grating, so the first area 201 in FIG.
  • FIG. 5 is a schematic structural diagram of the grayscale distribution of the grating formed by the first region 201 before adjustment in an embodiment of the application.
  • FIG. 5 includes a front view and a left view of the first area 201.
  • the features or content identified by dotted lines in the drawings involved in the embodiments of the present application can be understood as optional operations or optional structures of the embodiments.
  • FIG. 6 is a schematic flowchart of the LCOS adjustment method in an embodiment of the application.
  • step 601 the controller obtains the first intensity value of the first optical signal.
  • the first intensity value is the power of the first optical signal reflected by the first region in the LCOS.
  • the grayscale distribution of the grating is loaded.
  • LCOS includes K ⁇ H areas, K points to the port direction of LCOS, K is an integer greater than 0, H points to the wavelength direction of LCOS, and H is an integer greater than 1. In the embodiments of the present application, K is 1 and H is 3 as an example for description.
  • the LCOS includes a first area 201, a third area 202, and a fourth area 208.
  • the first incident optical signal input from the port 301 passes through the dispersive element 305, and the dispersive element 305 decomposes the first incident optical signal into a first optical signal group with optical signals of different wavelengths, and combines the first optical signal
  • An optical signal group is transmitted to LCOS306.
  • the first optical signal group includes a first optical signal, a third optical signal and a fourth optical signal, and different optical signals have different wavelengths.
  • the first optical signal is incident on the first area 201
  • the third optical signal is incident on the third area 202
  • the fourth optical signal is incident on the fourth area 208.
  • the optical signals incident on the region can be output from different output ports.
  • an example will be given to illustrate the association relationship between the area and the port in the LCOS. Please refer to FIG. 7, which is a schematic diagram of the association between different areas and ports of the LCOS in an embodiment of the application.
  • the target output port of the first area 201 is the first port 701, the target output port of the third area 202 is the third port 703, the target output port of the fourth area 208 is the fourth port 704, and the fourth port 704 is also used as the application
  • the input port in the embodiment, the second port 702 is not associated with the LCOS area.
  • the target output port of the first optical signal and the target output port of the third optical signal may be the same port, for example, both are the first port 701.
  • the first port 701 is associated with the first area
  • the third port 703 is associated with the third area for illustrative purposes only.
  • the first intensity value may be a target intensity value or a crosstalk intensity value.
  • the target intensity value refers to the power of the first optical signal output by the first optical signal from the target output port
  • the crosstalk intensity value refers to the negative value of the power of the first optical signal output by the first optical signal from the non-target output port.
  • the target output port refers to a port where the first optical signal is expected to be output
  • the non-target output port refers to a port where the first optical signal generates crosstalk.
  • the power of the first optical signal output by the target output port is generally greater than the power of the first optical signal output by the non-target output port.
  • the first port 701 is a target output port of the first optical signal
  • the second port 702 to the eighth port are non-target output ports of the first optical signal.
  • step 602 the controller adjusts the boundary line of the grating in the first region.
  • the controller adjusts the position of the starting point of the pixel point to which the gradient voltage is applied in the first area, thereby moving the boundary line of the grating, that is, adjusting the boundary line of the grating in the first area.
  • the controller can adjust the boundary line of the grating in the first region by translation, and the controller can also adjust the boundary line of the grating by adjusting the period and maximum phase of the grating in the first region.
  • FIG. 8 is a schematic structural diagram of the gray scale distribution of the grating formed by the adjusted first region 201 in the embodiment of the application.
  • the coordinates of the boundary lines of the gratings in the port direction are 14, 34, and 54 respectively.
  • the coordinates of the boundary lines of the gratings in the port direction are 0, 20, 40, and 60, respectively. Therefore, it can be understood that the grayscale distribution of the grating in FIG.
  • the grayscale distribution of the grating in FIG. 5 is shifted downward by 6 as a whole, or it can be understood that the grayscale distribution of the grating in FIG. 5 is shifted upward by 14 as a whole.
  • the gray distribution of the translation grating is adopted, in the first region, the boundary lines of all the gratings are shifted in the port direction.
  • the redirection angle of the first optical signal will not change, that is, the target output port corresponding to the first area will not change, and the target output port of the first optical signal is still the first port 701.
  • the first light spot 210 covers 4 periodic gratings and 3 boundary lines. After adjustment, the first light spot 210 covers 3 periodic gratings and 2 boundary lines.
  • FIG. 9 is a schematic diagram of the gray scale distribution of the grating under different translation amounts in the embodiment of the application.
  • the translation amounts in Fig. 9 are 0, 5, 10, and 15 respectively.
  • FIG. 10 is another schematic structural diagram of the gray scale distribution of the grating formed by the adjusted first region 201 in the embodiment of the application.
  • the period of the grating is 40, and the maximum phase of the grating is 2 ⁇ .
  • the period of the grating is 20, and the maximum phase of the grating is ⁇ .
  • Adjusting the boundary line of the grating by adjusting the period and maximum phase of the grating in the first region can not only keep the reorientation angle of the first light signal unchanged, but also can further reduce when the first period is less than the second period.
  • the first period is the period of the grating in the first area before the controller adjusts the period of the grating in the first area.
  • the second period is the period of the grating in the first area after the controller adjusts the period of the grating in the first area.
  • the first light spot 210 covers 4 periodic gratings and 3 boundary lines. After adjustment, the first light spot 210 covers 3 periodic gratings and 2 boundary lines.
  • the controller after increasing the period and maximum phase of the grating, also translates the boundary line of the grating.
  • the periodic grating covered by the first light spot 210 will be reduced, thereby increasing the sensitivity of the first light signal.
  • the power of the first optical signal output from the target output port can be maintained at a better value.
  • the first intensity value of the first optical signal fluctuates between 4-6.
  • the first intensity value of the first optical signal is between 2-8. Between fluctuations. By shifting the boundary line of the grating, the first intensity value of the first optical signal can fluctuate between 4-8. Therefore, it is meaningful to translate the boundary line of the grating and increase the period of the grating.
  • the center line of the first spot and the grayscale distribution of a periodic grating in the first region The distance of the center line is less than A/4, and A is the half-height width of the first spot.
  • the center line of the first spot falls within a certain periodic grating.
  • the center line of the gray distribution of a periodic grating refers to the position of the periodic grating equal to (X+Y)/2 in the port direction , X is the position of the minimum phase of the periodic grating, and Y is the position of the maximum phase of the periodic grating.
  • the coordinate of the center line 801 of the first light spot is 46
  • the coordinate of the center line 802 of the periodic grating is (34+54)/2.
  • the boundary line of the grating in the first region is adjusted so that the first spot is in phase with a periodic grating in the first region. match. Matching refers to making the first light spot overlap with a periodic grating in the first region as much as possible. If the height of the first light spot is less than the height of the gray distribution of a periodic grating in the first region, the boundary line of the grating in the first region is adjusted so that the first light spot is within a periodic grating in the first region.
  • step 603 the controller obtains a second intensity value of the first optical signal, where the second intensity value is greater than the first intensity value.
  • the controller After the controller adjusts the boundary line of the grating in the first region, the controller obtains the second intensity value of the first light signal.
  • the method for obtaining the second intensity value is similar to the method for obtaining the first intensity value. If the first intensity value is obtained through the third port, the second intensity value should also be obtained through the third port. If the second intensity value is greater than the first intensity value, the first light spot covers as few border lines of the grating as possible.
  • a positioning sensor needs to be installed in the LCOS to obtain the start position and end position of the first spot in the port direction, and it needs to be calculated between the start position and the end position. The number of junction lines. Compared with the above technical means, it is simpler to judge whether the first light spot covers the boundary line of the grating as little as possible by the intensity value of the first light signal, and the cost is reduced.
  • the corresponding target output port such as the first port, is determined in the first area.
  • the first intensity value and the second intensity value are bound to the first port.
  • the first optical signal corresponding to the first intensity value and the first optical signal corresponding to the second intensity value are not an optical signal, but the target output ports of the two first optical signals are both first ports, so the two All first optical signals are called first optical signals.
  • the first optical signal generates different light intensity levels from the first port to the eighth port. Different light intensity levels include +1 level (target level) and crosstalk level. The +1 level is the level with the strongest energy among all the light intensity levels. +1 steps are output at the target output port.
  • the first optical signals of other levels will be output as crosstalk signals from other non-target output ports, thereby causing crosstalk between different output ports of the WSS.
  • the first intensity value and the second intensity value are crosstalk intensity values
  • the first intensity value and the second intensity value are negative values of the energy of the strongest crosstalk level.
  • the power of the first optical signal at the target output port is 60 decibel milliwatts
  • the power of the second optical signal at the second port to the eighth port is 20 decibel milliwatts, 10 decibel milliwatts, and 2 Decibel milliwatt, 2 decibel milliwatt, 1 decibel milliwatt, 1 decibel milliwatt, 1 decibel milliwatt.
  • the first intensity value and the second intensity value are measured at the second port.
  • the controller also obtains a third intensity value and a fourth intensity value, where the fourth intensity value is greater than the third intensity index.
  • the fourth intensity value and the third intensity value are both negative values of the energy of the strongest crosstalk level, that is, the first intensity value and the second intensity value are the crosstalk intensity values.
  • the controller not only needs to confirm that the second intensity value is greater than the first intensity value, but also that the fourth intensity value is greater than the third intensity value. Only when the power of the first optical signal output at the target output port increases, it is output at the non-target output port.
  • the controller confirms that the first light spot covers fewer boundary lines of the gratings.
  • the positive and negative conditions are used to determine whether the result of adjusting the boundary line of the grating is beneficial, which can increase reliability. If the first intensity value and the second intensity value are negative values of the energy of the strongest crosstalk level, the third intensity value and the fourth intensity value are the target intensity values, which are contrary to the above content, and will not be repeated here.
  • step 604 the controller adjusts the topography coefficient of the grating in the first region.
  • the controller After the controller obtains the second intensity value, the controller adjusts the topography coefficient of the grating in the first region.
  • the controller calculates the grating position, it can be based on the grating formula:
  • FIG. 11 is a schematic diagram of the gray scale distribution of the grating when the topography coefficient is adjusted under the condition that a is unchanged in the embodiment of the present application.
  • the gray scale distribution map 1101 is a gray scale distribution map of the raster when a is equal to 1, b is equal to 0, and c is equal to 0.
  • the gray scale distribution map 1102 is the gray scale distribution map of the raster when a is equal to 1, b is equal to 20, and c is equal to 0.
  • the gray scale distribution map 1103 is the gray scale distribution map of the raster when a is equal to 1, b is equal to -20, and c is equal to 0.
  • the gray distribution map 1104 is the gray distribution map of the raster when a is equal to 1, b is equal to 0, and c is equal to 20.
  • the gray scale distribution map 1105 is the gray scale distribution map of the raster when a is equal to 1, b is equal to 20, and c is equal to -20.
  • the gray scale distribution map 1106 is the gray scale distribution map of the raster when a is equal to 1, b is equal to 20, and c is equal to 20.
  • step 605 the controller obtains a third intensity value of the first optical signal, and the third intensity value is greater than the second intensity value.
  • the controller After the controller adjusts the profile coefficient of the grating in the first region, the controller obtains the third intensity value of the first light signal.
  • the method for obtaining the third intensity value is similar to the method for obtaining the second intensity value.
  • the controller further adjusts the boundary lines of the gratings in the second area, so that the second light spot covers the boundary lines of the gratings as little as possible.
  • the second area is one of the K ⁇ H areas of the LCOS, the second area is the area where the second light signal forms the second light spot, and the second area can redirect the second light signal.
  • the center line of the second light spot is different from the center line of the first light spot, that is, the first area and the second area belong to different areas in the port direction.
  • K is an integer greater than 1
  • the first optical signal and the second optical signal belong to Input optical signals from different input ports. In the case of having multiple input ports, different input optical signals are expanded along the wavelength direction at different positions in the port direction. As shown in Fig. 12, Fig.
  • the center line 1204 of the first light spot 1203 and the center line 1201 of the second light spot 1202 are not the same center line. As long as it is determined that the center line of the light spot is not the same, it can be determined that the two light spots fall in different areas. Therefore, there is no need to have clear boundaries for the division of areas in the port direction. For example, in the ⁇ 1 area in FIG. 12, the dividing line for the area in the port direction falls on a periodic grating.
  • the manner in which the controller adjusts the boundary line of the gratings in the second area is similar to the manner in which the controller adjusts the boundary line of the gratings in the first area.
  • the height of the LCOS of multiple input ports (that is, when K is greater than 1) in the port direction will not increase exponentially according to the number of input ports, and it is even possible Keep the height constant in the port direction. Therefore, in order that the input optical signals of different input ports do not interfere with each other, it is necessary to reduce the height of the first optical signal in the port direction, which is specifically embodied in reducing the height of the first light spot in the port direction. As shown in FIG. 12, the height of the first light spot 1203 in the port direction is only half of the height of the first light spot 210 in FIG.
  • Reducing the height of the first light spot in the port direction will make the period of the grating covered by the first light spot less, that is, make the first light signal more sensitive.
  • the power of the first optical signal output from the target output port will fluctuate more easily.
  • the boundary line of the grating the power of the first optical signal output from the target output port can tend to To stabilize, that is, to reduce the sensitivity of the first optical signal.
  • the boundary lines of the gratings are adjusted so that the first light spot covers fewer boundary lines of the gratings, the power of the first optical signal output from the target output port can be maintained at a better value.
  • the controller further adjusts the boundary lines of the gratings in the third area so that the third light spot covers the boundary lines of the gratings as little as possible.
  • the third area is one of the K ⁇ H areas of the LCOS, the third area is the area where the third optical signal forms the third light spot, and the third area can redirect the third optical signal.
  • the center line of the third light spot is the same as the center line of the first light spot, that is, the first optical signal and the third optical signal belong to the input optical signals of the same input port, and the wavelength ranges of the first optical signal and the third optical signal are different.
  • the first region and the third region can individually adjust the boundary line of the grating, so that the adjustment of the first region or the third region does not affect each other.
  • the center line 1204 of the third light spot 1205 in the third region is the same as the center line 1204 of the first light spot 1203.
  • the first spot is a flat top spot.
  • the energy distribution of the flat-top light spot in the port direction is relatively even. Therefore, the flat-top light spot needs to pay attention to the number of boundary lines of the grating covered by the entire light spot.
  • FIG. 13 is a schematic diagram of the energy distribution of the flat top spot 1301 in an embodiment of the application.
  • the LCOS adjustment method in the embodiment of the present application is described above, and the optical device in the embodiment of the present application is described below.
  • the optical device in this application is an optical device including LCOS, such as WSS, DGFF, WB, etc.
  • the optical device includes a first input port, a first output port, a dispersive element and an LCOS.
  • the first input port is used for incident the first incident optical signal to the dispersive element.
  • the dispersive element is used to decompose the first incident optical signal into a first optical signal group of optical signals with different wavelengths, and transmit the first optical signal group to the LCOS, in which the grayscale distribution of the grating is loaded.
  • LCOS includes K ⁇ H regions, K is an integer greater than 0, and H is an integer greater than 1.
  • the first area in the K ⁇ H areas is the area where the first light signal forms the first light spot, and the first light signal belongs to the first light signal group.
  • the boundary lines of the gratings in the first region are configured so that the first light spot covers the boundary lines of the gratings as little as possible.
  • LCOS is used to redirect the first optical signal, and transmit the redirected first optical signal to the first output port.
  • the first input port can refer to the aforementioned fourth port 704 in FIG. 7, and the first output port can refer to the aforementioned first port 701 in FIG. 7.
  • the first input port and the first output port may be the same port.
  • the fourth port 704 serves as both an input port and an output port corresponding to the fourth area.
  • the boundary line of the gratings in the first region is configured such that the first light spot covers the boundary line of the gratings with as little as possible: the second intensity value is greater than the first intensity value.
  • the boundary line of the grating in the first region is configured so that the distance between the center line of the first light spot and the center line of the gray distribution of a periodic grating in the first region is less than A/4, where A is the distance of the first light spot Half-height width.
  • the boundary line of the grating in the first region is configured so that the boundary line of the grayscale distribution of the grating with the first light spot covering as little as possible is, after the grayscale distribution of the grating in the first region is translated along the port direction owned.
  • the gray distribution of the translational grating means that the different phases of the periodic grating have the same shift along the port direction without changing the period of the periodic grating.
  • the boundary lines of the gratings in the first region are configured so that the first light spot covers the boundary lines of the gratings as little as possible.
  • the condition that the redirection angle of the first optical signal remains unchanged is obtained after adjusting the period and maximum phase of the grating in the first region.
  • the boundary line of the gratings in the first region is configured so that the first light spot covers the boundary line of the grayscale distribution of the grating as little as possible.
  • the height of the first light spot is less than the height of the grayscale distribution of a periodic grating in the first region, then if the first light spot is within the grayscale distribution of a periodic grating in the first region, the boundary of the grating in the first region
  • the lines are arranged so that the first light spot covers the boundary line of the grayscale distribution of the grating as little as possible.
  • the topography coefficient of the gray scale distribution of the grating in the first region is configured such that the third intensity value is greater than the second intensity value.
  • the second intensity value is the power of the optical signal at the first output port before the topography coefficient of the gray scale distribution of the grating in the first region is configured.
  • the third intensity value is the power of the optical signal at the first output port after the profile coefficient of the gray scale distribution of the grating in the first region is configured.
  • the profile coefficient of the gray scale distribution of the grating is referred to as the profile coefficient of the grating.
  • the third intensity value can also be the target intensity value or the crosstalk intensity value. If the second intensity value is the target intensity value, the third intensity value is the target intensity value; if the second intensity value is the crosstalk intensity value, then the third intensity value Is the crosstalk intensity value.
  • the optical device further includes a second input port.
  • the second input port is used for incident the second incident optical signal to the dispersive element.
  • the dispersive element is also used to decompose the second incident optical signal into a second optical signal group of optical signals with different wavelengths, and transmit the second optical signal group to the LCOS, where the second area of the K ⁇ H areas is
  • the second light signal forms the area of the second light spot.
  • the second optical signal belongs to the second optical signal group.
  • the center line of the second light spot is different from the center line of the first light spot, that is, the first area and the second area belong to different areas in the port direction, and K is an integer greater than 1.
  • the boundary lines of the gratings in the second area are configured so that the second light spot covers the boundary lines of the gratings as little as possible.
  • LCOS is also used to redirect the second optical signal.
  • the third area in the K ⁇ H areas is the area where the third light signal forms the third light spot, the third light signal belongs to the first light signal group, and the center line of the third light spot is the same as the center line of the first light spot The same, the first optical signal and the third optical signal have different wavelength ranges.
  • the boundary lines of the gratings in the third region are arranged so that the third light spot covers the boundary lines of the grayscale distribution of the gratings as little as possible.
  • LCOS is also used to redirect the third optical signal.
  • the first spot is a flat top spot.
  • optical device in the embodiment of the present application is described above, and the reconfigurable optical add/drop multiplexer in the embodiment of the present application is described below.
  • FIG. 14 is a schematic structural diagram of a reconfigurable optical add/drop multiplexer in an embodiment of this application.
  • the reconfigurable optical add/drop multiplexer of this embodiment includes a demultiplexing module 1401 and a multiplexing module 1402; the ROADM of this embodiment may also include a drop module 1403, an add module 1404, a receiver 1406, and a transmitter 1406.
  • the demultiplexing module 1401 is used to download the first optical wavelength signal to the current site, and the first optical wavelength signal may refer to the first optical signal in the aforementioned optical device.
  • the multiplexing module 1402 is configured to receive the second optical wavelength signal uploaded by the current site, and the second optical wavelength signal is an optical signal with a different wavelength from the first optical signal.
  • the aforementioned optical device of the demultiplexing module and/or the multiplexing module the optical device is WSS.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks and other media that can store program codes.

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  • Optical Communication System (AREA)

Abstract

Est divulgué un procédé de réglage de LCOS, qui peut être appliqué au domaine de la communication optique. Le procédé de réglage de LCOS selon la présente demande consiste à : ajuster des lignes de jonction de la distribution des niveaux de gris de réseaux dans une première zone, de sorte qu'un premier point lumineux couvre aussi peu de lignes de jonction de la distribution des niveaux de gris des réseaux que possible, la première zone étant l'une de K × H zones de LCOS, K étant un nombre entier supérieur à 0 et H étant un nombre entier supérieur à 1 ; le LCOS est chargé avec la distribution des niveaux de gris des réseaux ; et la première zone étant une zone dans laquelle un premier signal optique forme le premier point lumineux et la première zone est utilisée pour rediriger le premier signal optique. La diaphonie se produit au niveau des lignes de jonction des réseaux, et le premier point lumineux couvre aussi peu de lignes de jonction des réseaux que possible au moyen du réglage des lignes de jonction des réseaux dans la première zone, de telle sorte que la diaphonie puisse être réduite.
PCT/CN2021/081985 2020-05-21 2021-03-22 Procédé de réglage de lcos, dispositif optique et multiplexeur à insertion-extraction optique reconfigurable WO2021232925A1 (fr)

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