[go: up one dir, main page]

WO2024060782A1 - Moteur de commutation optique, et dispositif et procédé associés - Google Patents

Moteur de commutation optique, et dispositif et procédé associés Download PDF

Info

Publication number
WO2024060782A1
WO2024060782A1 PCT/CN2023/105198 CN2023105198W WO2024060782A1 WO 2024060782 A1 WO2024060782 A1 WO 2024060782A1 CN 2023105198 W CN2023105198 W CN 2023105198W WO 2024060782 A1 WO2024060782 A1 WO 2024060782A1
Authority
WO
WIPO (PCT)
Prior art keywords
modulator
optical signal
polarization state
target optical
target
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/105198
Other languages
English (en)
Chinese (zh)
Inventor
吴亮
宗良佳
叶亚斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2024060782A1 publication Critical patent/WO2024060782A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters
    • 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
    • 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
    • G02B6/35—Optical coupling means having switching means
    • 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
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
    • G02B6/3546—NxM switch, i.e. a regular array of switches elements of matrix type constellation
    • 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
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G02B6/356—Switching arrangements, i.e. number of input/output ports and interconnection types in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects

Definitions

  • the present application relates to the field of optical switching, and in particular, to an optical switching engine and related equipment and methods.
  • ROADM Reconfiguration Optical Add-Drop Multiplexer
  • OXC Optical Cross-Connect
  • WSS wavelength selective switches
  • the WSS module can independently allocate any wavelength in the wavelength division multiplexing signal of the input port to any output port, without the need for electro-optical/photoelectric conversion, and directly switches and routes the optical signals of network nodes at the optical layer.
  • LCOS Liquid Crystal on Silicon
  • the deflection direction of the beam passing through LCOS can be changed, thereby switching the output port of the beam.
  • part of the beam may be transmitted to the non-target port, causing crosstalk.
  • multiple intermediate phase images are usually inserted between the initial state phase image and the final state phase image of LCOS to make the phase changes during the switching process controllable and avoid crosstalk.
  • inserting multiple intermediate phase diagrams will cause the switching time to become longer, affecting the switching speed of the optical switching engine.
  • Embodiments of the present application provide an optical switching engine and related equipment and methods to ensure that there will be no crosstalk when switching ports, and to shorten the time required to switch ports.
  • inventions of the present application provide an optical switching engine.
  • the optical switching engine includes a first modulator and a second modulator, and the target optical signal from the input port in the port component is transmitted to the optical switching engine.
  • the first modulator is used to receive the target optical signal. If the optical switching engine is in the first working state, the first modulator is used to transmit the target optical signal to the second modulator, and the second modulator is used to adjust the deflection direction of the target optical signal so that the target optical signal is directed toward the first port component. Output port transmission. If the optical switching engine is in a switching state, the first modulator is used to modulate the target optical signal so that the target optical signal is transmitted in other directions except the port component.
  • the first modulator is used to transmit the target optical signal to the second modulator
  • the second modulator is used to adjust the deflection direction of the target optical signal so that the target optical signal is directed toward the second port assembly. Output port transmission.
  • the optical switching engine includes two layers of modulators, and the optical switching engine has two states, one is a working state, and the other is a switching state.
  • the working state includes different working states such as a first working state and a second working state.
  • the optical switching engine can adjust the deflection direction of the incident optical signal by loading an electrical signal on one of the modulators.
  • the electrical signals loaded by the optical switching engine are also different when the optical switching engine is in different working states. For example, the optical switching engine loads a first electrical signal when it is in the first working state, and the optical switching engine loads a second electrical signal when it is in the second working state.
  • the two layers of modulators cooperate to transmit the optical signal toward the designated output port. If the optical switching engine is in the switching state, the electrical signal loaded on one of the modulators of the optical switching engine is in the switching process, and the two layers of modulators cooperate to prevent the optical signal from being output from the port component.
  • the working mode of the two layers of modulators when the optical switching engine is in the working state is different from the working mode of the two layers of modulators when the optical switching engine is in the switching state. Therefore, from the implementation effect of the optical switching engine, the state of the optical switching engine can be divided into a working state and a switching state.
  • this application does not limit the specific time points at which the optical switching engine starts the switching state and ends the switching state, as long as the duration of the switching state includes the switching duration of the electrical signal. For example, before the loaded first electrical signal is switched to the second electrical signal, the optical switching engine can be put in the switching state in advance to ensure that no optical signal will crosstalk to other output ports after the electrical signal starts switching. After the loading of the second electrical signal is completed, the optical switching engine is switched back to the working state. It should be understood that since this application sets a switching state for the optical switching engine, it is only necessary to switch the loaded first electrical signal to the second electrical signal to complete the switching, without the need for switching between the first electrical signal and the second electrical signal. Loading multiple other electrical signals shortens the time required to switch ports.
  • the optical switching engine includes a two-layer modulator, and the optical switching engine has two states, one is the working state, and the other is the switching state.
  • the two-layer modulator of the optical switching engine can normally adjust the deflection direction of the optical signal through cooperation so that it can be transmitted to the designated output port.
  • the two-layer modulators of the optical switching engine cooperate so that no optical signal is temporarily output from the port component, thus avoiding optical signal crosstalk to other output ports during the port switching process.
  • the optical switching engine sets a switching state between the first working state and the second working state, there is no need to worry about port crosstalk during the electrical signal switching process. Therefore, it is only necessary to switch the loaded first electrical signal to the second electrical signal. The signal can complete the switching from the first working state to the second working state, so there is no need to load multiple other electrical signals between the first electrical signal and the second electrical signal, which shortens the time required to switch the port.
  • the target optical signal has a first polarization state. If the optical switching engine is in the switching state, the first modulator is specifically used to adjust the target optical signal to the second polarization state, and transmit the target optical signal with the second polarization state to the second modulator. Wherein, the first polarization state and the second polarization state are orthogonal to each other, and the target optical signal with the second polarization state will not be adjusted in the deflection direction by the second modulator, so that the target optical signal with the second polarization state is directed toward the port component. transmission in other directions. In this embodiment, the first modulator specifically adjusts the polarization state of the target optical signal to realize transmission of the target optical signal in other directions except the port component, which enhances the practicability of this solution.
  • the first modulator is also used to adjust the target optical signal to a third polarization state, and transmit the target optical signal with the third polarization state to the third polarization state.
  • Two modulators, the first polarization state and the third polarization state are different.
  • the second modulator is used to adjust the deflection direction of the partial target optical signal having the third polarization state, so that the partial target optical signal having the third polarization state is transmitted to the first output port.
  • the first modulator is also used to adjust the target optical signal to a third polarization state, and transmit the target optical signal with the third polarization state to the second modulator
  • the second modulator uses Adjusting the deflection direction of the partial target optical signal with the third polarization state, so that the partial target optical signal with the third polarization state is transmitted to the second output port.
  • the first modulator can also rotate the polarization state of the optical signal to any angle.
  • the second modulator can adjust the polarization state of part of the optical signal. Turn the direction so that part of the optical signal can be transmitted to the designated output port, thereby meeting the need to attenuate the optical signal output from the port in some scenarios.
  • the first modulator includes a glass substrate, a pixelated electrode substrate, a first liquid crystal layer, a first alignment layer and a second alignment layer, and the first liquid crystal layer is located between the first alignment layer and the second alignment layer.
  • the first alignment layer is located between the pixelated electrode substrate and the first liquid crystal layer
  • the second alignment layer is located between the glass substrate and the first liquid crystal layer.
  • the second modulator includes a glass substrate, a silicon-based backplane, a second liquid crystal layer, a third alignment layer and a fourth alignment layer. The second liquid crystal layer is located between the third alignment layer and the fourth alignment layer.
  • the third alignment layer is located between Between the glass substrate and the second liquid crystal layer, the fourth alignment layer is located between the silicon-based backplane and the second liquid crystal layer.
  • ITO indium-tin-oxide
  • a specific structure of an optical switching engine is provided.
  • the optical switching engine uses an integrated packaging process to package the first modulator and the second modulator into one device. The first modulator and the second modulator are not separated. , there is no air gap between the two, and light does not refract or diffract between the two.
  • the optical switching engine using this structural design has a higher integration level.
  • the first modulator is specifically used to adjust the deflection direction of the target optical signal so that the target optical signal is transmitted in a direction other than the second modulator.
  • the first modulator specifically adjusts the deflection direction of the target optical signal to realize the transmission of the target optical signal in other directions except the port component, which enhances the practicability of this solution.
  • the first modulator is also used to attenuate the target optical signal transmitted to the second modulator by adjusting the deflection direction of the target optical signal. , thereby meeting the need to attenuate the optical signal output from the port in some scenarios.
  • the first modulator is a micro-electro-mechanical system (MEMS) micromirror, a digital micro-mirror device (Digital Micro-Mirror Devices, DMD) or a liquid crystal device, and the second modulator For MEMS micromirrors, DMD or liquid crystal devices.
  • MEMS micro-electro-mechanical system
  • DMD Digital Micro-Mirror Devices
  • an embodiment of the present application provides an optical switching engine.
  • the optical switching engine includes a first modulator and a second modulator, and a target optical signal from an input port in a port assembly is transmitted to the optical switching engine, and the target optical signal has a first polarization state.
  • the first modulator is used to receive the target optical signal and transmit the target optical signal to the second modulator.
  • the first modulator is used to adjust the deflection direction of the target optical signal with a first polarization state, or the first modulator is used to adjust the deflection direction of the target optical signal with a second polarization state after passing through the second modulator, and the first polarization state and the second polarization state are orthogonal to each other.
  • the second modulator is used to adjust the target optical signal of the first polarization state to a second polarization state, so that the target optical signal with the second polarization state is transmitted to the first output port in the port assembly through the first modulator. If the optical switching engine is in a switching state, the second modulator is used to reflect the target optical signal of the first polarization state, so that the target optical signal of the first polarization state is transmitted to other directions except the port assembly through the first modulator.
  • the second modulator is used to adjust the target optical signal of the first polarization state to the second polarization state, so that the target optical signal with the second polarization state is transmitted to the second output port in the port assembly through the first modulator.
  • the first modulator if the optical switching engine is in the first working state, the first modulator is used to adjust the deflection direction of the target optical signal in the first polarization state and transmit the target optical signal in the first polarization state to the second modulator. device. If the optical switching engine is in the switching state, the first modulator is used to adjust the deflection direction of the target optical signal in the first polarization state and transmit the target optical signal in the first polarization state to the second modulator; the first modulator is also used to adjust The deflection direction of the target optical signal in the first polarization state reflected by the second modulator, so that the target optical signal in the first polarization state is transmitted in other directions except the port component. lose. If the optical switching engine is in the second working state, the first modulator is used to adjust the deflection direction of the target optical signal in the first polarization state and transmit the target optical signal in the first polarization state to the second modulator.
  • the second modulator is used to adjust the target optical signal in the first polarization state to the third polarization state and transmit the target optical signal in the third polarization state.
  • the first polarization state is different from the third polarization state, and the first modulator is also used to adjust the deflection direction of the partial target light signal with the third polarization state, so that the partial target light signal with the third polarization state Signals are transmitted in directions other than the first output port.
  • the second modulator is used to adjust the target optical signal in the first polarization state to the third polarization state and transmit the target optical signal with the third polarization state to the first modulator, the first The modulator is also used to adjust the deflection direction of the partial target optical signal having the third polarization state, so that the partial target optical signal having the third polarization state is transmitted in other directions than the second output port.
  • the first modulator if the optical switching engine is in the first working state, the first modulator is used to adjust the deflection direction of the target optical signal with the second polarization state, so that the target optical signal with the second polarization state is directed toward the third One output port transmits. If the optical switching engine is in the second working state, the first modulator is used to adjust the deflection direction of the target optical signal with the second polarization state, so that the target optical signal with the second polarization state is transmitted to the second output port.
  • the second modulator is used to adjust the target optical signal in the first polarization state to the third polarization state and transmit the target optical signal in the third polarization state.
  • the first polarization state is different from the third polarization state, and the first modulator is used to adjust the deflection direction of the partial target optical signal with the third polarization state, so that the partial target optical signal with the third polarization state is directed toward The first output port transmits.
  • the second modulator is used to adjust the target optical signal in the first polarization state to the third polarization state and transmit the target optical signal with the third polarization state to the first modulator; first The modulator is used to adjust the deflection direction of the partial target optical signal with the third polarization state, so that the partial target optical signal with the third polarization state is transmitted to the second output port.
  • inventions of the present application provide an optical switching engine.
  • the optical switching engine includes a first modulator and a second modulator, and the target optical signal from the input port in the port component is transmitted to the optical switching engine.
  • the first modulator is used to receive the target optical signal. If the optical switching engine is in the first working state, the first modulator is used to adjust the deflection direction of the target optical signal and transmit the target optical signal to the second modulator.
  • the first modulator is also used to adjust the deflection direction of the target optical signal reflected by the second modulator, so that the target optical signal is transmitted to the first output port in the port assembly.
  • the first modulator is used to adjust the deflection direction of the target optical signal and transmit the target optical signal to the second modulator.
  • the second modulator is used to adjust the deflection direction of the target optical signal, so that the target optical signal is reflected in directions other than the first modulator.
  • the first modulator is used to adjust the deflection direction of the target optical signal and transmit the target optical signal to the second modulator.
  • the first modulator is also used to adjust the deflection direction of the target optical signal reflected by the second modulator, so that the target optical signal is transmitted to the second output port in the port assembly.
  • the second modulator is also used to adjust the deflection direction of the target optical signal, so that part of the target optical signal is reflected in directions other than the first modulator. , to attenuate the target optical signal transmitted to the first output port. If the optical switching engine is in the second working state, the second modulator is also used to adjust the deflection direction of the target optical signal, so that part of the target optical signal is reflected in directions other than the first modulator to attenuate the target optical signal toward the second output port. Transmit the target optical signal.
  • an embodiment of the present application provides a WSS.
  • the WSS includes: a port component, a dispersion device and the above-mentioned The optical switching engine described in any one of the embodiments of the first aspect to the third aspect, wherein the port component includes an input port, a first output port, and a second output port.
  • the dispersion device is used to decompose the combined optical signal input from the input port into a plurality of sub-wavelength optical signals, and transmit the plurality of sub-wavelength optical signals to the optical switching engine, wherein the target optical signal received by the optical switching engine is at least one sub-wavelength optical signal among the plurality of sub-wavelength optical signals.
  • the WSS further includes a polarization component, which is used to perform polarization processing on the combined optical signal from the input port so that each sub-wavelength optical signal in the combined optical signal has a polarization state.
  • the WSS further includes a first lens and a second lens, the first lens is located between the port component and the dispersion device, and the second lens is located between the dispersion device and the optical switching engine.
  • the first lens is used to converge the multiplexed optical signals from the input port.
  • the second lens is used to collimate each sub-wavelength optical signal from the dispersion device.
  • an embodiment of the present application provides a ROADM.
  • the ROADM includes: at least one first WSS and at least one second WSS, the first WSS and the second WSS are WSSs as described in any embodiment of the fourth aspect.
  • At least one first WSS is used to add or drop waves, and at least one second WSS is used to send optical signals to the line side or receive optical signals from the line side.
  • embodiments of the present application provide an optical transmission system.
  • the optical transmission system includes multiple ROADMs as described in the fifth aspect, and each adjacent two ROADMs are connected through optical fibers.
  • embodiments of the present application provide an optical transmission method.
  • the method is applied to an optical switching engine.
  • the optical switching engine includes a first modulator and a second modulator.
  • a target optical signal from an input port in a port component is transmitted to the optical switching engine; the method includes: receiving the target optical signal through the first modulator. . If the optical switching engine is in the first working state, the target optical signal is transmitted to the second modulator through the first modulator, and the deflection direction of the target optical signal is adjusted through the second modulator, so that the target optical signal is directed toward the first port component. Output port transmission. If the optical switching engine is in a switching state, the target optical signal is modulated by the first modulator, so that the target optical signal is transmitted in other directions except the port component.
  • the target optical signal is transmitted to the second modulator through the first modulator, and the deflection direction of the target optical signal is adjusted through the second modulator, so that the target optical signal moves toward the second port component in the port assembly.
  • Output port transmission If the optical switching engine is in the second working state, the target optical signal is transmitted to the second modulator through the first modulator, and the deflection direction of the target optical signal is adjusted through the second modulator, so that the target optical signal moves toward the second port component in the port assembly.
  • the target optical signal has a first polarization state
  • modulating the target optical signal through the first modulator includes: adjusting the target optical signal to a second polarization state through the first modulator, and having the first polarization state.
  • the target optical signal in the two polarization states is transmitted to the second modulator, wherein the first polarization state and the second polarization state are orthogonal to each other, and the target optical signal with the second polarization state passes through the second modulator to the port other than the port component. transmission in other directions.
  • the method further includes: if the optical switching engine is in the first working state, adjusting the target optical signal to a third polarization state through the first modulator, and transmitting the target optical signal with the third polarization state. to the second modulator, the first polarization state is different from the third polarization state; the deflection direction of the partial target optical signal with the third polarization state is adjusted through the second modulator, so that the partial target optical signal with the third polarization state is directed toward The first output port transmits.
  • the target optical signal is adjusted to the third polarization state through the first modulator, and the target optical signal with the third polarization state is transmitted to the second modulator, and the target optical signal is adjusted through the second modulator.
  • the deflection direction of the partial target optical signal having the third polarization state is such that the partial target optical signal having the third polarization state is transmitted to the second output port.
  • the first modulator includes a glass substrate, a pixelated electrode substrate, a first liquid crystal layer, a first alignment layer and a second alignment layer, and the first liquid crystal layer is located between the first alignment layer and the second alignment layer.
  • the first alignment layer is located between the pixelated electrode substrate and the first liquid crystal layer
  • the second alignment layer is located between the glass substrate and the first liquid crystal layer.
  • second modulation The device includes a glass substrate, a silicon-based backplane, a second liquid crystal layer, a third alignment layer and a fourth alignment layer.
  • the second liquid crystal layer is located between the third alignment layer and the fourth alignment layer.
  • the third alignment layer is located between the glass substrate and the fourth alignment layer.
  • the fourth alignment layer is located between the silicon-based backplane and the second liquid crystal layer; ITO is provided on both the front and back surfaces of the glass substrate.
  • modulating the target optical signal through the first modulator includes: adjusting the deflection direction of the target optical signal through the first modulator, so that the target optical signal is transmitted in a direction other than the second modulator. .
  • the method further includes: if the optical switching engine is in the first working state or the second working state, adjusting the deflection direction of the target optical signal by the first modulator to attenuate the target optical signal transmitted to the second modulator.
  • the first modulator is a MEMS micromirror, DMD or liquid crystal device
  • the second modulator is a MEMS micromirror, DMD or liquid crystal device.
  • embodiments of the present application provide an optical transmission method.
  • the method is applied to an optical switching engine.
  • the optical switching engine includes a first modulator and a second modulator.
  • a target optical signal from an input port in a port component is transmitted to the optical switching engine.
  • the target optical signal has a first polarization state; the method includes: The target optical signal of the first polarization state is received through the first modulator, and the target optical signal of the first polarization state is transmitted to the second modulator.
  • the first modulator is used to adjust the deflection direction of the target optical signal with the first polarization state, or the first modulator is used to adjust the deflection direction of the target optical signal with the second polarization state after passing through the second modulator.
  • the first The polarization state and the second polarization state are orthogonal to each other. If the optical switching engine is in the first working state, the target optical signal in the first polarization state is adjusted to the second polarization state through the second modulator, so that the target optical signal with the second polarization state passes through the first modulator to the port component. transmitted on the first output port. If the optical switching engine is in the switching state, the target optical signal in the first polarization state is reflected through the second modulator, so that the target optical signal in the first polarization state is transmitted through the first modulator in other directions except the port component.
  • the target optical signal in the first polarization state is adjusted to the second polarization state through the second modulator, so that the target optical signal with the second polarization state passes through the first modulator to the port component. transmitted through the second output port.
  • the method further includes: if the optical switching engine is in the first working state, adjusting the deflection direction of the target optical signal in the first polarization state through the first modulator and transmitting the target optical signal in the first polarization state. to the second modulator. If the optical switching engine is in a switching state, the first modulator is used to adjust the deflection direction of the target optical signal in the first polarization state and the target optical signal in the first polarization state is transmitted to the second modulator; the first modulator is used to adjust the deflection direction of the target optical signal in the first polarization state.
  • the deflection direction of the target optical signal in the first polarization state reflected by the two modulators is such that the target optical signal in the first polarization state is transmitted in other directions except the port component. If the optical switching engine is in the second working state, the first modulator is used to adjust the deflection direction of the target optical signal in the first polarization state and transmit the target optical signal in the first polarization state to the second modulator.
  • the method further includes: if the optical switching engine is in the first working state, adjusting the target optical signal in the first polarization state to the third polarization state through the second modulator and converting the target optical signal in the third polarization state into the third polarization state.
  • the target optical signal is transmitted to the first modulator, the first polarization state is different from the third polarization state, and the deflection direction of the part of the target optical signal with the third polarization state is adjusted by the first modulator, so that the part with the third polarization state
  • the target optical signal is transmitted in directions other than the first output port.
  • the target optical signal in the first polarization state is adjusted to the third polarization state through the second modulator and the target optical signal in the third polarization state is transmitted to the first modulator, and the target optical signal in the third polarization state is transmitted to the first modulator.
  • a modulator adjusts the deflection direction of the partial target optical signal having the third polarization state, so that the partial target optical signal having the third polarization state is transmitted in directions other than the second output port.
  • the method further includes: if the optical switching engine is in the first working state, adjusting the deflection direction of the target optical signal with the second polarization state through the first modulator, so that the target light signal with the second polarization state Optical signal direction The first output port transmits. If the optical switching engine is in the second working state, the deflection direction of the target optical signal with the second polarization state is adjusted through the first modulator, so that the target optical signal with the second polarization state is transmitted to the second output port.
  • the method further includes: if the optical switching engine is in the first working state, adjusting the target optical signal in the first polarization state to the third polarization state through the second modulator and converting the target optical signal in the third polarization state into the third polarization state.
  • the target optical signal is transmitted to the first modulator, the first polarization state is different from the third polarization state, and the deflection direction of the part of the target optical signal with the third polarization state is adjusted by the first modulator, so that the part with the third polarization state
  • the target optical signal is transmitted to the first output port.
  • the target optical signal in the first polarization state is adjusted to the third polarization state through the second modulator and the target optical signal in the third polarization state is transmitted to the first modulator, and the target optical signal in the third polarization state is transmitted to the first modulator.
  • a modulator adjusts the deflection direction of the partial target optical signal with the third polarization state, so that the partial target optical signal with the third polarization state is transmitted to the second output port.
  • embodiments of the present application provide an optical transmission method.
  • the method is applied to an optical switching engine.
  • the optical switching engine includes a first modulator and a second modulator.
  • a target optical signal from an input port in a port component is transmitted to the optical switching engine; the method includes: receiving the target optical signal through the first modulator. . If the optical switching engine is in the first working state, the deflection direction of the target optical signal is adjusted through the first modulator and the target optical signal is transmitted to the second modulator; the target optical signal reflected by the second modulator is adjusted through the first modulator
  • the deflection direction is such that the target optical signal is transmitted to the first output port in the port assembly.
  • the deflection direction of the target optical signal is adjusted through the first modulator and the target optical signal is transmitted to the second modulator; the deflection direction of the target optical signal is adjusted through the second modulator, so that the target optical signal Reflected in directions other than the first modulator. If the optical switching engine is in the second working state, adjust the deflection direction of the target optical signal through the first modulator and transmit the target optical signal to the second modulator; adjust the target optical signal reflected by the second modulator through the first modulator The deflection direction is such that the target optical signal is transmitted to the second output port in the port assembly.
  • the method further includes: if the optical switching engine is in the first working state, adjusting the deflection direction of the target optical signal through the second modulator, so that part of the target optical signal is deflected to the target optical signal other than the first modulator. Directional reflection to attenuate the target optical signal transmitted to the first output port. If the optical switching engine is in the second working state, the deflection direction of the target optical signal is adjusted through the second modulator, so that part of the target optical signal is reflected in directions other than the first modulator to attenuate the light transmitted to the second output port. target light signal.
  • the optical switching engine includes a two-layer modulator.
  • the optical switching engine has two states, one is the working state and the other is the switching state.
  • the two-layer modulator of the optical switching engine can normally adjust the deflection direction of the optical signal through cooperation so that it can be transmitted to the designated output port.
  • the two-layer modulators of the optical switching engine cooperate so that no optical signal is temporarily output from the port component, thus avoiding optical signal crosstalk to other output ports during the port switching process.
  • the optical switching engine sets a switching state between the first working state and the second working state, there is no need to worry about port crosstalk during the electrical signal switching process. Therefore, it is only necessary to switch the loaded first electrical signal to the second electrical signal.
  • the signal can complete the switching from the first working state to the second working state, so there is no need to load multiple other electrical signals between the first electrical signal and the second electrical signal, which shortens the time required to switch the port.
  • FIG. 1 is a system architecture diagram of ROADM
  • FIG. 2 is a schematic diagram of an optical path of WSS in the embodiment of the present application.
  • Figure 3 is a first schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • Figure 4 is a schematic structural diagram of a possible optical switching engine in an embodiment of the present application.
  • Figure 5 shows a design method of each orientation layer in the optical switching engine
  • Figure 6 is a schematic diagram of the attenuation function implemented by the optical switching engine
  • Figure 7 is a second schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • Figure 8 is a third schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • Figure 9 is a fourth schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • Figure 10 is a fifth schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • FIG 11 is a schematic structural diagram of a ROADM in an embodiment of the present application.
  • FIG12 is a schematic diagram of a structure of an optical transmission system in an embodiment of the present application.
  • Figure 13 is a schematic flow chart of the first optical switching method in the embodiment of the present application.
  • FIG14 is a schematic diagram of a second process of the optical switching method in an embodiment of the present application.
  • Figure 15 is a schematic flow chart of the third optical switching method in the embodiment of the present application.
  • Figure 16 is a schematic flow chart of the fourth optical switching method in the embodiment of the present application.
  • Embodiments of the present application provide an optical switching engine and related equipment and methods to ensure that there will be no crosstalk when switching ports, and to shorten the time required to switch ports.
  • first the terms "first”, “second”, etc. (if present) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific sequence. Or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein.
  • the optical switching engine provided by this application can be mainly used in WSS, and WSS is mainly used in ROADM.
  • WSS is mainly used in ROADM.
  • FIG 1 is a system architecture diagram of ROADM.
  • ROADM consists of line-side modules and client-side modules.
  • the line side module usually includes multiple interconnected WSS 101
  • the client side module includes an add-drop wavelength selective switch (ADWSS) 102.
  • ADWSS add-drop wavelength selective switch
  • the ADWSS 102 has M line-side ports, and the M line-side ports are respectively connected to the M WSS 101 in the line-side module.
  • the ADWSS 102 has N client-side ports, and N customers The side ports are respectively connected to N optical transceiver modules on the client side.
  • the number of N depends on the number of add/drop services on the client side.
  • WSS 101 is used to send optical signals to the line side or receive optical signals from the line side
  • ADWSS 102 is used to add or drop optical signals.
  • WSS provided by the embodiment of this application may be WSS 101 or ADWSS 102. In the following, WSS and ADWSS will no longer be distinguished, and WSS will be used for introduction and explanation.
  • FIG2 is a schematic diagram of an optical path of a WSS in an embodiment of the present application.
  • the WSS includes a port assembly 10, a dispersion device 20, and an optical switching engine 30.
  • the port assembly 10 includes an input port 101 and a plurality of output ports, for example, the plurality of output ports include a first output port 102 and a second output port 103, etc.
  • the transmission direction of light is defined as the C direction
  • the port direction is defined as the A direction
  • the dispersion direction of light is defined as the B direction.
  • the port direction It can also be called the exchange direction
  • the dispersion direction can also be called the wavelength direction.
  • direction A is perpendicular to direction C
  • direction B is perpendicular to direction C
  • direction A is perpendicular to direction B
  • present application does not limit the specific number of ports in the WSS, and the number shown in the figure is only an example.
  • the input port 101 inputs a multiplexed optical signal including multiple wavelengths.
  • the multiplexed optical signal includes a total of n wavelengths ⁇ 1, ⁇ 2... ⁇ n.
  • the dispersion device 20 can decompose the multiplexed optical signal into multiple sub-wavelength optical signals in the Y direction, so that the multiple sub-wavelength optical signals are spatially separated.
  • the optical switching engine 30 is used to separately modulate the input multiple sub-wavelength optical signals, thereby adjusting the deflection direction of each sub-wavelength optical signal. Each sub-wavelength optical signal after the deflection direction is adjusted is transmitted to the corresponding output port through the dispersion device 20.
  • the first sub-wavelength optical signal is transmitted to the first output port 102
  • the second sub-wavelength optical signal is transmitted to the second output port 103.
  • the optical switching engine 30 can flexibly adjust the deflection direction of each sub-wavelength optical signal by loading different electrical signals to switch the output port of each sub-wavelength optical signal. For example, by changing the phase map loaded on the optical switching engine 30, the first sub-wavelength optical signal is switched to be transmitted to the second output port 103, or the second sub-wavelength optical signal is switched to be transmitted to the first output port 102.
  • the WSS may also include a polarizing component 40 , a first lens 50 and a second lens 60 .
  • the first lens 50 is located between the port assembly 10 and the dispersion device 20
  • the second lens 60 is located between the dispersion device 20 and the optical switching engine 30 .
  • the polarization component 40 is used to perform polarization processing on the multiplexed optical signal input from the input port 101, so that each sub-wavelength optical signal in the multiplexed optical signal has a specified polarization state.
  • the implementation form of the port component 10 includes but is not limited to an optical fiber array and a waveguide array, etc., which can be a one-dimensional array or a two-dimensional array.
  • the implementation form of the dispersion component 20 includes but is not limited to a grating and a prism.
  • the optical switching engine 30 can change the deflection direction of the sub-wavelength optical signal so that the sub-wavelength optical signal can be transmitted to the output port without loss, or the sub-wavelength optical signal cannot be transmitted to the output port, or part of the sub-wavelength optical signal can be transmitted to the output port. It should be understood that the optical path design in the WSS shown in Figure 1 above is only used as an example.
  • WSS can also use a reflective dispersion component 20
  • WSS can also use a transmissive optical switching engine 30.
  • the specific optical path is known to those skilled in the art and will not be introduced one by one here.
  • the optical switching engine provided by this application has a two-layer modulator. Based on the design of the two-layer modulator, the optical switching engine has two states, one is the working state and the other is the switching state. In the working state, the optical switching engine can normally adjust the deflection direction of the optical signal so that it can be transmitted to the designated output port. In the switching state, the optical switching engine processes so that all output ports have no optical signal output. It should be understood that modulator 1 is used to adjust the deflection direction of the optical signal, and modulator 2 is used to realize state switching of the optical switching engine.
  • the working state of the optical switching engine includes different working states such as the first working state and the second working state.
  • the optical switching engine can adjust the deflection direction of the incident optical signal by loading electrical signals on the modulator 1.
  • the electrical signals it loads are also different.
  • the optical switching engine loads the first electrical signal when in the second working state
  • the optical switching engine loads the second electrical signal when in the second working state. It should be understood that if the optical switching engine is in working state, the two-layer modulators cooperate to cause the optical signal to be transmitted toward the designated output port.
  • the optical switching engine is in a switching state
  • the electrical signal loaded by modulator 1 is in the process of switching, and the two-layer modulators cooperate so that no optical signal is output from the port component. That is to say, the working mode of the two-layer modulator when the optical switching engine is in the working state is different from the working mode of the two-layer modulator when the optical switching engine is in the switching state. Therefore, the implementation effect of the optical switching engine can be The status is divided into working status and switching status.
  • the present application does not limit the specific time points at which the optical switching engine starts the switching state and ends the switching state.
  • the duration of the switching state includes the switching duration of the electrical signal.
  • the optical switching engine can be put into the switching state in advance to ensure that there will be no optical signal crosstalk to other output ports after the electrical signal starts to switch, and then the optical switching engine can be switched back to the working state after the second electrical signal is loaded. It should be understood that since the present application sets a switching state for the optical switching engine, there is no need to worry about port crosstalk during the switching of electrical signals. Therefore, it is only necessary to switch the loaded first electrical signal to the second electrical signal to complete the switching, without having to load multiple other electrical signals between the first electrical signal and the second electrical signal, thereby shortening the time required to switch the port.
  • the optical switching engine provided by this application is introduced in detail below.
  • the following takes the processing of one of the sub-wavelength optical signals by the optical switching engine as an example.
  • the sub-wavelength optical signal will be referred to as an optical signal for short.
  • the positions of the two-layer modulators in the optical switching engine can be interchanged, so the application provides a variety of optical switching engine design solutions.
  • modulator 2 is located on the upper layer and modulator 1 is located on the lower layer.
  • modulator 1 is located on the upper layer and modulator 2 is located on the lower layer.
  • the upper layer and the lower layer are defined according to the order of optical signal input.
  • the upper layer modulator will first receive the optical signal input to the optical switching engine.
  • the above-mentioned modulator 2 also has a variety of implementations.
  • the modulator 2 can realize the state switching of the optical switching engine by selecting whether to adjust the polarization state of the incident optical signal; for another example, the modulator 2 can also select whether to adjust the polarization state of the incident optical signal.
  • the deflection direction of the optical signal is used to realize the state switching of the optical switching engine. It should be understood that this application does not limit the specific implementation of the modulator 1 to adjust the beam deflection direction.
  • the modulator 1 can use a liquid crystal device, a micro-electro-mechanical system (MEMS) micromirror, or a digital micromirror device ( Digital Micro-Mirror Devices (DMD) or metasurface (Metasurface), etc., the specific design will be known to those skilled in the art, and this application will not introduce them one by one.
  • MEMS micro-electro-mechanical system
  • DMD Digital Micro-Mirror Devices
  • Metalasurface metasurface
  • Embodiment 1 Modulator 2 is located on the upper layer, and modulator 1 is located on the lower layer. Modulator 2 is used to adjust the polarization state of the optical signal. Modulator 1 and modulator 2 use liquid crystal modulators, and the incident optical signal has the first polarization state.
  • FIG 3 is a first schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • the optical signal from the input port 101 has the first polarization state.
  • the optical switching engine is in the first working state, that is, the modulator 1 is currently loading a first electrical signal, and the modulator 2 is used to transparently transmit the optical signal from the input port 101 to the modulator 1 , the modulator 1 adjusts the deflection direction of the optical signal according to the loaded first electrical signal, so that the optical signal is transmitted to the first output port 102 .
  • the optical switching engine is in a switching state.
  • the modulator 2 adjusts the optical signal from the input port 101 to the second polarization state, where the first polarization state and the second polarization state interact with each other. Orthogonal. It should be understood that since the polarization state of the optical signal is deflected by 90°, the modulator 1 can no longer adjust the deflection direction of the optical signal. After being reflected by the modulator 1, the optical signal is transmitted in other directions except the port assembly 10, that is, the optical signal is transmitted in other directions except the port assembly 10. There is no port crosstalk when the switching engine is in switching state.
  • the optical switching engine is in the second working state, that is, modulator 1 is currently loading a second electrical signal, and modulator 2 is used to transparently transmit the optical signal from input port 101 to modulator 1 , the modulator 1 adjusts the deflection direction of the optical signal according to the loaded second electrical signal, so that the optical signal is transmitted to the second output port 103 .
  • FIG 4 is a schematic structural diagram of a possible optical switching engine in an embodiment of the present application.
  • the modulator 2 includes a glass substrate 301, a pixelated electrode substrate 302, a first liquid crystal layer 303, a first alignment layer 304 and a second alignment layer 305.
  • the first liquid crystal layer 303 is located between the first alignment layer 304 and the second alignment layer 305.
  • the first alignment layer 304 is located between the pixelated electrode substrate 302 and the first liquid crystal layer 303
  • the second alignment layer 305 is located between the glass substrate 301 and the first liquid crystal layer 303 .
  • the modulator 1 includes a glass substrate 301, a silicon-based backplane 306, a second liquid crystal layer 307, a third alignment layer 308 and a fourth alignment layer 309.
  • the second liquid crystal layer 307 is located between the third alignment layer 308 and the fourth alignment layer 309.
  • the third alignment layer 308 is located between the glass substrate 301 and the second liquid crystal layer 307
  • the fourth alignment layer 309 is located between the silicon-based backplane 306 and the second liquid crystal layer 307. between.
  • ITO indium-tin-oxide
  • the optical switching engine uses an integrated packaging process to package modulator 1 and modulator 2 into one device. Modulator 1 and modulator 2 are not separated, and there is no air gap between them, and Light does not refract or diffract between the two.
  • the electrode distribution on the pixelated electrode substrate 302 corresponds to the pixel distribution in the first liquid crystal layer 303, thereby providing pixel-level control capability.
  • the modulator 2 can adjust the polarization state of the optical signal by applying a voltage to the pixelated electrode substrate 302 .
  • the electrodes on the pixelated electrode substrate 302 may be one-dimensionally distributed or two-dimensionally distributed, depending on actual needs, and are not limited here.
  • Figure 5 shows a design method of each orientation layer in the optical switching engine.
  • the second alignment layer and the third alignment layer can be regarded as the front and back sides of the intermediate layer respectively.
  • the direction perpendicular to the plane of each alignment layer is defined as the Z direction
  • the X direction and the Y direction are parallel to the plane of each alignment layer
  • the X direction is perpendicular to the Y direction.
  • the polarization direction of the incident light signal is parallel to the X direction
  • the first alignment layer is oriented along the X direction
  • the second alignment layer, the third alignment layer and the fourth alignment layer are oriented along the Y direction.
  • modulator 2 does not load electrical signals
  • the liquid crystal molecules maintain the initial arrangement direction
  • the polarization direction of the incident light signal is parallel to the X direction
  • modulator 1 can normally adjust the deflection direction of the light signal, so that the light The signal is transmitted to the specified output port.
  • the modulator 2 changes the arrangement direction of the liquid crystal molecules by loading an electrical signal, so that the polarization direction of the optical signal is parallel to the Y direction.
  • the modulator 1 cannot adjust the deflection direction of the optical signal, so that Optical signals travel in directions other than the port component.
  • the example introduced in Figure 5 above is based on the twisted nematic (TN) mode to set the polarization state of the optical signal and the orientation direction of each alignment layer.
  • TN twisted nematic
  • the polarization state of the optical signal and the orientation of each alignment layer can also be flexibly set based on vertical alignment (Vertical Alignment, VA), electrically controlled birefringence (ECB) or ferroelectric liquid crystal mode.
  • VA Vertical Alignment
  • EBC electrically controlled birefringence
  • ferroelectric liquid crystal mode Ferroelectric liquid crystal mode
  • the optical switching engine can be designed to comply with different forms of Single WSS, Twin WSS or Quard WSS.
  • the number of rows of electrode distribution on the pixelated electrode substrate 302 matches the number of ports of the WSS.
  • the electrode distribution on the pixelated electrode substrate 302 is arranged in a row.
  • the electrode distribution on the pixelated electrode substrate 302 is arranged in two rows.
  • the silicon-based backplane 306 has very small pixels, so it can be divided in the port direction according to different design requirements of Single WSS, Twin WSS or Quard WSS.
  • the optical switching engine can be divided into channels corresponding to the number of wavelengths in the dispersion direction.
  • the electrodes of the pixelated electrode substrate 302 are divided into 80 channels
  • the electrodes of the silicon-based backplane 306 are divided into 80 channels.
  • the modulator 2 when the optical switching engine is in working state, can also adjust the polarization state of the optical signal. For example, the modulator 2 modulates the first polarization state of the optical signal to a third polarization state that is different from the first polarization state. That is to say, the modulator 2 can also rotate the polarization state of the optical signal at any angle. In this way, the modulator 1 can adjust the deflection direction of part of the optical signal so that the part of the optical signal can be transmitted to the designated output port, thereby meeting the need to attenuate the optical signal output from the port in some scenarios. For example, when the optical switching engine is in the first working state, part of the optical signal is output from the first output port 102 .
  • the attenuation ratio of the optical signal is related to the polarization state of the optical signal by modulator 2.
  • the angle of rotation depends on the size, and can be set flexibly according to actual needs. There is no limit here. It should be understood that in this embodiment, if the third polarization state is the same as the second polarization state, all optical signals will be attenuated.
  • Figure 6 is a schematic diagram of the attenuation function implemented by the optical switching engine.
  • the modulator 2 when there is no need to attenuate the optical signal, the modulator 2 does not adjust the polarization state of the optical signal, and the optical power output from the output port is relatively high.
  • the modulator 2 adjusts the polarization state of the optical signal so that the optical power output from the output port and the attenuation ratio can be controlled by the voltage applied to the modulator 2 .
  • all electrodes corresponding to the entire channel can be controlled to attenuate the power of the signal spectrum as a whole; it is also possible to control the electrodes corresponding to some channels to attenuate the local optical power of the signal spectrum.
  • Embodiment 2 Modulator 2 is located on the upper layer, and modulator 1 is located on the lower layer. Modulator 2 is used to adjust the deflection direction of the optical signal.
  • Figure 7 is a second schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • the optical switching engine is in the first working state, that is, the modulator 1 is currently loading the first electrical signal, and the modulator 2 is used to transparently transmit the optical signal from the input port 101 to the modulator 1 , the modulator 1 adjusts the deflection direction of the optical signal according to the loaded first electrical signal, so that the optical signal is transmitted to the first output port 102 .
  • the optical switching engine is in a switching state.
  • the modulator 2 adjusts the deflection direction of the optical signal from the input port 101, so that the optical signal is transmitted in other directions except the modulator 1. . It should be understood that since the modulator 1 cannot receive the optical signal, the modulator 1 naturally cannot reflect the optical signal back to the port component 10, that is, there will be no port crosstalk when the optical switching engine is in the switching state.
  • the optical switching engine is in the second working state, that is, modulator 1 is currently loading a second electrical signal, and modulator 2 is used to transparently transmit the optical signal from input port 101 to modulator 1 , the modulator 1 adjusts the deflection direction of the optical signal according to the loaded second electrical signal, so that the optical signal is transmitted to the second output port 103 .
  • the modulator 2 can use devices such as liquid crystal devices, MEMS micromirrors, DMDs or metasurfaces to adjust the deflection direction of the optical signal.
  • devices such as liquid crystal devices, MEMS micromirrors, DMDs or metasurfaces to adjust the deflection direction of the optical signal.
  • the modulator 2 when the optical switching engine is in working state, can also adjust the deflection direction of part of the optical signal, so that the part of the optical signal is transmitted in other directions than the modulator 1 . In this way, the modulator 1 can only adjust the deflection direction of the remaining part of the optical signal so that the remaining part of the optical signal can be transmitted to the designated output port, thereby meeting the need to attenuate the optical signal output by the port in some scenarios. For example, when the optical switching engine is in the first working state, a part of the optical signal is output from the first output port 102 . For another example, when the optical switching engine is in the second working state, a part of the optical signal is output from the second output port 103.
  • Embodiment 3 Modulator 1 is located on the upper layer, and modulator 2 is located on the lower layer. Modulator 2 is used to adjust the polarization state of the optical signal. Modulator 1 and modulator 2 use liquid crystal modulators, and the incident optical signal has the first polarization state.
  • Figure 8 is a third schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • the optical signal from the input port 101 has the first polarization state.
  • the optical switching engine is in the first working state, that is, the modulator 1 is currently loading a first electrical signal, and the modulator 1 adjusts the deflection direction of the optical signal according to the loaded first electrical signal and transmits the light
  • the signal is transmitted to the modulator 2, which is used to adjust the optical signal to a second polarization state, where the first polarization state and the second polarization state are orthogonal to each other.
  • the modulator 1 can no longer adjust the deflection direction of the optical signal, and the optical signal is transmitted to the first output port 102.
  • the optical switching engine is in the switching state, and the modulator 1 adjusts the deflection direction of the optical signal and transmits the optical signal to the modulator.
  • Modulator 2 no longer adjusts the polarization state of the optical signal.
  • modulator 1 adjusts the deflection direction of the optical signal again so that the optical signal is directed toward the outside of port component 10.
  • the optical switching engine is in the second working state, that is, the modulator 1 is currently loading a second electrical signal, and the modulator 1 adjusts the deflection direction of the optical signal according to the loaded second electrical signal and transmits the light
  • the signal is transmitted to modulator 2, which modulates the optical signal to a second polarization state.
  • the modulator 1 can no longer adjust the deflection direction of the optical signal, and the optical signal is transmitted to the second output port 103.
  • the modulator 2 when the optical switching engine is in working state, can also adjust the first polarization state of the optical signal to a third polarization state, and the third polarization state is different from the first polarization state. That is to say, the modulator 2 can also rotate the polarization state of the optical signal at any angle. In this way, after the optical signal is reflected back to the modulator 1 by the modulator 2, the modulator 1 can adjust the deflection direction of part of the optical signal, so that the part of the optical signal can be transmitted in other directions besides the designated output port, thus satisfying some requirements. The need to attenuate the optical signal output from the port in the scenario.
  • the attenuation ratio of the optical signal is related to the angle through which the modulator 2 rotates the polarization state of the optical signal, and can be set flexibly according to actual needs, and is not limited here. It should be understood that in this embodiment, if the modulator 2 does not adjust the polarization state of the optical signal, all optical signals will be attenuated.
  • Embodiment 4 modulator 1 is located at the upper layer, modulator 2 is located at the lower layer, modulator 2 is used to adjust the polarization state of the optical signal, modulator 1 and modulator 2 use liquid crystal modulators, and the incident optical signal has a second polarization state.
  • Figure 9 is a fourth schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • the optical switching engine is in the first working state, that is, the modulator 1 is currently loading the first electrical signal. Since the optical signal is in the second polarization state, the modulator 1 cannot adjust the deflection direction of the optical signal.
  • modulator 1 transparently transmits the optical signal to modulator 2.
  • the modulator 2 is used to adjust the optical signal to a first polarization state, where the first polarization state and the second polarization state are orthogonal to each other.
  • the modulator 1 can adjust the deflection direction of the optical signal so that the optical signal is transmitted to the first output port 102.
  • the optical switching engine is in the switching state. Since the optical signal is in the second polarization state, modulator 1 cannot adjust the deflection direction of the optical signal.
  • Modulator 1 transparently transmits the optical signal to modulator 2. .
  • Modulator 2 does not adjust the polarization state of the optical signal.
  • modulator 1 still cannot adjust the deflection direction of the optical signal.
  • the optical signal is transmitted in other directions except port component 10.
  • the optical switching engine is in the second working state, that is, the modulator 1 is currently loading the second electrical signal. Since the optical signal is in the second polarization state, the modulator 1 cannot adjust the deflection direction of the optical signal. , modulator 1 transparently transmits the optical signal to modulator 2.
  • the modulator 2 is used to adjust the optical signal to the first polarization state. After the optical signal is reflected back to the modulator 1 by the modulator 2, since the polarization state of the optical signal has changed by 90°, the modulator 1 can adjust the deflection direction of the optical signal so that the optical signal is transmitted to the second output port 103.
  • the modulator 2 when the optical switching engine is in working state, can also adjust the first polarization state of the optical signal to a third polarization state, and the third polarization state is different from the first polarization state. That is to say, the modulator 2 can also rotate the polarization state of the optical signal at any angle. In this way, after the optical signal is reflected back to the modulator 1 by the modulator 2, the modulator 1 can adjust the deflection direction of part of the optical signal so that part of the optical signal can be transmitted to the designated output port, thus meeting the requirements for port output in some scenarios. The need for attenuation of optical signals.
  • the attenuation ratio of the optical signal is related to the angle through which the modulator 2 rotates the polarization state of the optical signal, and can be set flexibly according to actual needs, and is not limited here. It should be understood that in this embodiment, if the modulator 2 does not adjust the polarization state of the optical signal, all optical signals will be attenuated.
  • Embodiment 5 Modulator 1 is located on the upper layer, modulator 2 is located on the lower layer, and modulator 2 is used to adjust the deflection direction of the optical signal.
  • Figure 10 is a fifth schematic diagram of the switching state of the optical switching engine in the embodiment of the present application.
  • the optical switching engine is in the first working state, that is, the modulator 1 is currently loading a first electrical signal, and the modulator 1 adjusts the deflection direction of the optical signal according to the loaded first electrical signal and transmits the light
  • the signal is transmitted to modulator 2, which reflects the optical signal back to modulator 1.
  • the modulator 1 adjusts the deflection direction of the optical signal again so that the optical signal is transmitted to the first output port 102 .
  • the optical switching engine is in a switching state, and the modulator 1 adjusts the deflection direction of the optical signal and transmits the optical signal to the modulator 2.
  • Modulator 2 adjusts the deflection direction of the optical signal so that the optical signal is transmitted in other directions than modulator 1. It should be understood that since the modulator 1 cannot receive the optical signal, the optical signal will naturally not be transmitted to the port component 10, that is, there will be no port crosstalk when the optical switching engine is in the switching state.
  • the optical switching engine is in the second working state, that is, the modulator 1 is currently loading a second electrical signal, and the modulator 1 adjusts the deflection direction of the optical signal according to the loaded second electrical signal and transmits the light
  • the signal is transmitted to modulator 2, which reflects the optical signal back to modulator 1.
  • the modulator 1 adjusts the deflection direction of the optical signal again so that the optical signal is transmitted to the second output port 103 .
  • the modulator 2 can use devices such as liquid crystal devices, MEMS micromirrors, DMDs or metasurfaces to adjust the deflection direction of the optical signal.
  • devices such as liquid crystal devices, MEMS micromirrors, DMDs or metasurfaces to adjust the deflection direction of the optical signal.
  • the modulator 2 when the optical switching engine is in working state, can also adjust the deflection direction of part of the optical signal, so that the part of the optical signal is transmitted in other directions than the modulator 1 . In this way, the modulator 1 can only adjust the deflection direction of the remaining part of the optical signal so that the remaining part of the optical signal can be transmitted to the designated output port, thereby meeting the need to attenuate the optical signal output by the port in some scenarios. For example, when the optical switching engine is in the first working state, a part of the optical signal is output from the first output port 102 . For another example, when the optical switching engine is in the second working state, a part of the optical signal is output from the second output port 103.
  • the optical switching engine includes two layers of modulators.
  • the optical switching engine has two states, one is the working state and the other is the switching state.
  • the two-layer modulator of the optical switching engine can normally adjust the deflection direction of the optical signal through cooperation so that it can be transmitted to the designated output port.
  • the two-layer modulators of the optical switching engine cooperate so that no optical signal is temporarily output from the port component, thus avoiding optical signal crosstalk to other output ports during the port switching process.
  • the switching state is set between operating states. There is no need to worry about port crosstalk during the electrical signal switching process.
  • FIG 11 is a schematic structural diagram of a ROADM in an embodiment of the present application.
  • the ROADM includes at least one first WSS 1101 and at least one second WSS 1102.
  • both the first WSS 1101 and the second WSS 1102 can adopt the WSS provided by this application.
  • the second WSS 902 is used to send optical signals to the line side or receive optical signals from the line side.
  • the first WSS 1101 and the second WSS 1102 carry out wave uploading or wave dropping.
  • FIG 12 is a schematic structural diagram of an optical transmission system in an embodiment of the present application.
  • the optical transmission system includes multiple ROADMs connected through optical fibers.
  • the structure of the ROADM can be referred to the relevant introduction of the embodiment shown in Figure 11 above, and will not be described again here.
  • optical switching method provided by the embodiment of the present application is introduced below.
  • Fig. 13 is a schematic diagram of a first process flow of an optical switching method in an embodiment of the present application.
  • the optical switching method includes the following steps.
  • optical switching engine If the optical switching engine is in the first working state, transmit the optical signal to modulator 1 through modulator 2, and adjust the deflection direction of the optical signal through modulator 1 so that the optical signal is transmitted to the first output port in the port assembly.
  • the optical switching engine If the optical switching engine is in the switching state, modulate the optical signal through the modulator 2 so that the optical signal is transmitted in other directions except the port component.
  • the optical signal has a first polarization state. Specifically, the optical signal is adjusted to the second polarization state through the modulator 2, and the optical signal with the second polarization state is transmitted to the modulator 1, wherein the first polarization state and the second polarization state are orthogonal to each other, and have a third polarization state.
  • the optical signal with two polarization states will not be deflected by the modulator 1 to adjust the deflection direction, so that the optical signal with the second polarization state is transmitted in other directions except the port component.
  • the implementation of the optical switching method may refer to the relevant introduction of the embodiment shown in FIG. 3 above.
  • the deflection direction of the optical signal is adjusted through the modulator 2 so that the optical signal is transmitted in directions other than the modulator 1 .
  • the implementation of the optical switching method may refer to the relevant introduction of the embodiment shown in FIG. 7 above.
  • optical switching engine If the optical switching engine is in the second working state, transmit the optical signal to modulator 1 through modulator 2, and adjust the deflection direction of the optical signal through modulator 1 so that the optical signal is transmitted to the second output port in the port assembly.
  • FIG. 14 is a schematic flow chart of the second optical switching method in the embodiment of the present application.
  • the optical switching method includes the following steps.
  • the implementation of the optical switching method may refer to the relevant introduction of the embodiment shown in FIG. 8 above.
  • the optical signal has a first polarization state.
  • optical switching engine If the optical switching engine is in the first working state, adjust the deflection direction of the optical signal through modulator 1 and transmit the optical signal to modulator 2; adjust the optical signal to the second polarization state through modulator 2 and will have the second polarization state.
  • the polarized optical signal is transmitted to modulator 1.
  • the first polarization state and the second polarization state are orthogonal to each other, and the optical signal with the second polarization state will not be modulated by the modulator 1.
  • the deflection direction is such that the optical signal with the second polarization state is transmitted to the first output port in the port assembly.
  • optical switching engine If the optical switching engine is in the switching state, adjust the deflection direction of the optical signal through modulator 1 and transmit the optical signal to modulator 2; adjust the deflection direction of the optical signal reflected by modulator 2 through modulator 1, so that the light Signals are transmitted in directions other than the port component.
  • optical switching engine If the optical switching engine is in the second working state, adjust the deflection direction of the optical signal through modulator 1 and transmit the optical signal to modulator 2; adjust the optical signal to the second polarization state through modulator 2 and will have the second polarization state.
  • the polarized optical signal is transmitted to modulator 1.
  • the deflection direction of the optical signal with the second polarization state will not be adjusted by the modulator 1, so that the optical signal with the second polarization state is transmitted to the second output port in the port assembly.
  • Fig. 15 is a third flow chart of the optical switching method in the embodiment of the present application.
  • the optical switching method comprises the following steps.
  • the implementation of the optical switching method can refer to the relevant introduction of the embodiment shown in Fig. 9 above.
  • the optical signal has a first polarization state.
  • optical switching engine If the optical switching engine is in the first working state, adjust the optical signal to the second polarization state through modulator 2 and transmit the optical signal with the second polarization state to modulator 1; adjust the optical signal with the second polarization through modulator 1 The deflection direction of the optical signal in the second polarization state, so that the optical signal with the second polarization state is transmitted to the first output port in the port assembly;
  • first polarization state and the second polarization state are orthogonal to each other.
  • the optical switching engine If the optical switching engine is in the switching state, the optical signal is reflected through the modulator 2, so that the optical signal is transmitted in other directions except the port component.
  • optical switching engine If the optical switching engine is in the second working state, adjust the optical signal to the second polarization state through modulator 2 and transmit the optical signal with the second polarization state to modulator 1; adjust the optical signal with the second polarization through modulator 1
  • the deflection direction of the optical signal in the second polarization state is such that the optical signal in the second polarization state is transmitted to the second output port in the port component.
  • FIG. 16 is a schematic flow chart of the fourth optical switching method in the embodiment of the present application.
  • the optical switching method includes the following steps.
  • the implementation of the optical switching method may refer to the relevant introduction of the embodiment shown in FIG. 10 above.
  • modulator 1 loads the first electrical signal, adjust the deflection direction of the optical signal through modulator 1 and transmit the optical signal to modulator 2; adjust the deflection direction of the optical signal reflected by modulator 2 through modulator 1, So that the optical signal is transmitted to the first output port in the port component.
  • the deflection direction of the optical signal is adjusted through modulator 1 and the optical signal is transmitted to modulator 2; the deflection direction of the optical signal is adjusted through modulator 2 so that the optical signal is reflected in a direction other than modulator 1.
  • optical switching engine If the optical switching engine is in the second working state, adjust the deflection direction of the optical signal through modulator 1 and transmit the optical signal to modulator 2; adjust the deflection direction of the optical signal reflected by modulator 2 through modulator 1, so as to The optical signal is transmitted to the second output port in the port component.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mathematical Physics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

Des modes de réalisation de la présente demande concernent un moteur de commutation optique, et un dispositif et un procédé associés. Le moteur de commutation optique comprend deux couches de modulateurs. Le moteur de commutation optique a deux états, dont l'un est un état de fonctionnement et l'autre est un état de commutation. Dans l'état de fonctionnement, les deux couches de modulateurs du moteur de commutation optique fonctionnent conjointement pour ajuster normalement la direction de déviation d'un signal optique, de telle sorte que le signal optique est transmis à un port de sortie spécifié. Dans l'état de commutation, les deux couches de modulateurs du moteur de commutation optique fonctionnent conjointement de telle sorte qu'aucun signal optique n'est temporairement délivré à partir d'un ensemble port, ce qui permet d'éviter la diaphonie d'un signal optique vers d'autres ports de sortie dans le processus de commutation de port. De plus, l'état de commutation est réglé entre un premier état de fonctionnement et un second état de fonctionnement du moteur de commutation optique, de telle sorte que la commutation du premier état de fonctionnement au second état de fonctionnement peut être achevée par simple commutation d'un premier signal électrique chargé vers un second signal électrique, et il n'est pas nécessaire de charger de multiples autres signaux électriques entre le premier signal électrique et le second signal électrique, raccourcissant ainsi la durée requise pour la commutation de port.
PCT/CN2023/105198 2022-09-23 2023-06-30 Moteur de commutation optique, et dispositif et procédé associés Ceased WO2024060782A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211164495.2 2022-09-23
CN202211164495.2A CN117805975A (zh) 2022-09-23 2022-09-23 一种光交换引擎及相关设备和方法

Publications (1)

Publication Number Publication Date
WO2024060782A1 true WO2024060782A1 (fr) 2024-03-28

Family

ID=90430538

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/105198 Ceased WO2024060782A1 (fr) 2022-09-23 2023-06-30 Moteur de commutation optique, et dispositif et procédé associés

Country Status (2)

Country Link
CN (1) CN117805975A (fr)
WO (1) WO2024060782A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060072872A1 (en) * 2004-10-05 2006-04-06 Fujitsu Limited Switches for changing optical path and selecting wavelength
JP2009042558A (ja) * 2007-08-09 2009-02-26 Nippon Telegr & Teleph Corp <Ntt> 波長選択スイッチ
JP2014215390A (ja) * 2013-04-24 2014-11-17 住友電気工業株式会社 光路制御装置
US10393968B1 (en) * 2018-07-10 2019-08-27 Molex, Llc Apparatus for optical switching with transmissional and reflective polarization modulators
CN113156728A (zh) * 2020-01-22 2021-07-23 华为技术有限公司 一种可调液晶组件以及波长选择开关
CN114915367A (zh) * 2021-02-10 2022-08-16 Ii-Vi特拉华有限公司 具有共享基于液晶的切换组件的多个光学通道监视器的集成模块

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060072872A1 (en) * 2004-10-05 2006-04-06 Fujitsu Limited Switches for changing optical path and selecting wavelength
JP2009042558A (ja) * 2007-08-09 2009-02-26 Nippon Telegr & Teleph Corp <Ntt> 波長選択スイッチ
JP2014215390A (ja) * 2013-04-24 2014-11-17 住友電気工業株式会社 光路制御装置
US10393968B1 (en) * 2018-07-10 2019-08-27 Molex, Llc Apparatus for optical switching with transmissional and reflective polarization modulators
CN113156728A (zh) * 2020-01-22 2021-07-23 华为技术有限公司 一种可调液晶组件以及波长选择开关
CN114915367A (zh) * 2021-02-10 2022-08-16 Ii-Vi特拉华有限公司 具有共享基于液晶的切换组件的多个光学通道监视器的集成模块

Also Published As

Publication number Publication date
CN117805975A (zh) 2024-04-02

Similar Documents

Publication Publication Date Title
Marom et al. Survey of photonic switching architectures and technologies in support of spatially and spectrally flexible optical networking
US9008470B2 (en) Method and apparatus for wavelength selective switch
US9432750B1 (en) Contentionless N×M wavelength cross connect
CN102590953B (zh) 一种波长选择光开关
Fontaine et al. N× M wavelength selective crossconnect with flexible passbands
US20030025956A1 (en) Protected DWDM ring networks using wavelength selected switches
CN1397812A (zh) 光开关的系统和方法
US11728919B2 (en) Optical communications apparatus and wavelength selection method
US9654851B2 (en) Optical cross-connect device
WO2001028278A1 (fr) Selecteur optique d&#39;acheminement
JP2012510080A (ja) スペクトル帯域管理のための方法および装置
CN108700735B (zh) 一种用于波长选择开关wss的信号监控方法及装置
US20080219663A1 (en) Optical device with cascaded steering devices
US9521474B2 (en) Wavelength selective switch having multi-layer reflector
WO2024060782A1 (fr) Moteur de commutation optique, et dispositif et procédé associés
Gao et al. 1× 25 LCOS-based wavelength selective switch with flexible passbands and channel selection
Collings Wavelength selectable switches and future photonic network applications
WO2022267542A1 (fr) Procédé de transmission pour signal optique de service, et dispositif de réseau et réseau optique
CN113156675B (zh) 硅基液晶的驱动方法、相位调节装置、驱动设备和芯片
EP4586523A1 (fr) Multiplexeurs optiques d&#39;insertion-extraction a filtrage asymetrique
WO2024113855A1 (fr) Commutateur sélectif en longueur d&#39;onde, carte côté client et nœud
WO2022206191A1 (fr) Système de communication optique et procédé de communication optique
Ji et al. Spectrum variable colorless, directionless and contentionless multi-degree ROADM node
Marom et al. Beyond wavelength-selective channel switches: Trends in support of flexible/elastic optical networks
CN120161654A (zh) 空间光调制器、波长选择开关、光通信设备及系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23867077

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 23867077

Country of ref document: EP

Kind code of ref document: A1