WO2020186958A1 - 可重构光分插复用器、光网络及光信号处理方法 - Google Patents
可重构光分插复用器、光网络及光信号处理方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0205—Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
Definitions
- This application relates to the field of optical communication technology, and in particular to a reconfigurable optical add-drop multiplexer (ROADM), optical network, and optical signal processing method.
- ROADM reconfigurable optical add-drop multiplexer
- CDC-ROADM can complete optical wavelength routing between nodes and the landing of wavelength-independent, direction-independent, and non-blocking optical signals.
- CDC-ROADM in each node implements optical signal landing and loading through M:N devices.
- M:N devices different M ports in M:N devices correspond to different optical signal directions, and N ports are connected to optical conversion units (Optical Transform Unit (OTU) is connected.
- OTU optical Transform Unit
- M ⁇ N the optical signal entering from the M port is output from any one or more of the N ports; while in the optical signal loading direction (N ⁇ M), the optical signal entering from any N port
- the signals are combined at any M port and output.
- a 1:N optical splitter needs to be set at the M port of the M:N device, and an additional optical amplifier array needs to be introduced To compensate for the path difference loss caused by the optical splitter, resulting in a complex structure of CDC-RDADM.
- the embodiments of the present application provide a reconfigurable optical add/drop multiplexer, an optical network, and an optical signal processing method.
- a reconfigurable optical add-drop multiplexer, the reconfigurable optical add-drop multiplexer includes:
- At least two optical signal processing devices and at least one optical cross-connect (OXC) device where different optical signal processing devices correspond to different optical directions;
- Each of the optical signal processing devices includes a wavelength-selective switch (wavelength-selective switch, wss) and a filter, and the wavelength-selective switch is used to perform wavelength allocation on the input dense wavelength division multiplexing optical signal and then input the filter
- the filter is used to separate the optical signal output by the wavelength selective switch into a single-channel optical signal, and the filter is used to multiplex multiple single-channel optical signals output by the optical cross-connect device and input the A wavelength selective switch, the wavelength selective switch is used to combine the wavelength of the optical signal output by the filter to output; and
- the optical cross-connect device includes N upper ports and N lower ports.
- the optical cross-connect device is connected to the filter in each of the optical signal processing devices through the upper port, and the lower port is connected to the optical signal processing device.
- the conversion unit is connected, and the optical cross-connect device is used for landing the single-channel optical signal output by the filter, and input the single-channel optical signal output by the optical conversion unit into the filter through the upper port Device.
- An optical network the optical network includes: at least two optical network nodes;
- Each of the optical network nodes is provided with a reconfigurable optical add/drop multiplexer as described in the foregoing aspect, and the optical network nodes are connected by optical fibers.
- An optical signal processing method is executed by a reconfigurable optical add-drop multiplexer.
- the reconfigurable optical add-drop multiplexer includes at least two optical signal processing devices and at least one optical cross-connect device.
- the optical signal processing device corresponds to different light directions, and the method includes:
- the wavelength selective switch in the optical signal processing device receives the input dense wavelength division multiplexing optical signal
- the wavelength selective switch performs wavelength allocation on the dense wavelength division multiplexing optical signal, and inputs the wavelength allocated optical signal to a filter in the optical signal processing device;
- the filter separates the optical signal after the wavelength allocation into a single-channel optical signal, and inputs the single-channel optical signal to the upper port of the optical cross-connect device;
- the optical cross-connect device grounds the single-channel optical signal through the lower port.
- An optical signal processing method is executed by a reconfigurable optical add-drop multiplexer.
- the reconfigurable optical add-drop multiplexer includes at least two optical signal processing devices and at least one optical cross-connect device.
- the optical signal processing device corresponds to different light directions, and the method includes:
- the optical cross-connect device receives the single-channel optical signal output by the optical conversion unit through the lower port;
- the optical cross-connect device inputs the single-channel optical signal to the filter in the optical signal processing device through the upper port;
- the filter multiplexes more than one input single-channel optical signal, and inputs the multiplexed optical signal into the wavelength selection switch in the optical signal processing device;
- the wavelength selective switch performs wavelength combination on the multiplexed optical signal before outputting.
- Figure 1 shows an exemplary topological structure diagram of an optical network
- Figure 2 is a schematic diagram of the structure of CDC-ROADM in related technologies
- FIG. 3 shows a schematic structural diagram of a reconfigurable optical add/drop multiplexer provided by an embodiment of the present application
- FIG. 4 shows a schematic structural diagram of a reconfigurable optical add/drop multiplexer provided by another embodiment of the present application
- Fig. 5 is a schematic diagram of the connection between the wavelength selective switches corresponding to each light direction in Fig. 4;
- FIG. 6 shows a schematic structural diagram of a reconfigurable optical add/drop multiplexer provided by another embodiment of the present application.
- FIG. 7 shows a flowchart of an optical signal processing method provided by an embodiment
- FIG. 8 shows a flowchart of an optical signal processing method provided by another embodiment
- FIG. 9 shows a schematic structural diagram of an optical network provided by an embodiment of the present application.
- DWDM Dense Wavelength Division Multiplexing
- Reconfigurable optical add/drop multiplexer In DWDM system, a device used to complete dynamic wavelength (optical signal) landing and wavelength routing.
- Single-channel optical signal When the channel is a single-wavelength channel, the single-channel optical signal is a single-wavelength optical signal; when the access is a superchannel composed of multiple wavelengths, the single-channel optical signal is a multi-wavelength optical signal.
- FIG. 1 shows an exemplary topological structure diagram of an optical network.
- the optical network includes five optical network nodes a, b, c, d, and e.
- each optical network node is connected to each other through a point-to-point system.
- optical signal routing cannot be realized between optical network nodes, and it is also impossible to realize optical signal landing in any direction and any wavelength.
- CDC-ROADM needs to be set up in each optical network node.
- CDC-ROADM In the CDC-ROADM shown in Figure 2, two wavelength selective switches are used in each optical direction to perform wavelength allocation for the optical signals in the ingress direction and the egress direction, and the M in CDC-ROADM
- the :N device is used to achieve the landing function of optical signals in different light directions.
- the working principle of the M:N device is: in the M ⁇ N direction, the DWDM optical signal entering from the M side port is output through any one or more of the N side ports; in the N ⁇ M direction, from any N side The DWDM optical signal entering the port can be combined to any M-side port and then output.
- the wavelength group entering the M-side port of the M:N device (that is, the combination of optical signals of different wavelengths) can be controlled through the wavelength selection switch in each optical direction, and the M: The N device allocates the wavelength group received by the M-side port to the N-side port, thereby receiving single-wavelength optical signals through the coherent receiving function of the optical transformation unit (OTU) connected to the N-side port, achieving wavelength independence and direction Irrelevant, non-blocking optical signal landing.
- OFT optical transformation unit
- each M-side port of the M:N device needs to add a 1 ⁇ N optical splitter, (to achieve a single M-side port to each N-side port ), correspondingly, each N-side port of the M:N device selects one of the M channels as an optical signal output through an M ⁇ 1 optical switch.
- each N-side port of the M:N device needs to be equipped with a 1 ⁇ M optical switch (used to select which M-side port the optical signal is output to ), and an N ⁇ 1 coupling device is configured at the M-side port, so that the N ⁇ 1 coupling device is used to realize the optical signal coupling of different N-side ports.
- the path difference loss in the M ⁇ N direction is proportional to the number of ports of the splitter, that is, the more the number of ports of the splitter, the greater the path difference loss.
- an additional optical amplifier array can be installed in the M:N device to compensate for the optical signal after the split, or multiple M:N devices can be used to achieve the optical signal landing (that is, using multiple ports Fewer splitters).
- an additional optical amplifier array will increase the complexity of the CDC-ROADM structure, thereby increasing the failure rate of the entire system; the use of multiple M:N devices will increase the number of ports occupied by the wavelength selective switch in the optical direction, and each occupied A wavelength selective switch port will reduce an expandable light direction, which is not conducive to the expansion of subsequent systems.
- the corresponding optical signal processing device is set for each optical direction, so that the wavelength selection switch and filter in the optical processing device are used to transfer the input Dense wavelength division multiplexing optical signals are separated into single-channel optical signals, and optical cross-connect devices are used to land single-wavelength optical signals or multi-wavelength optical signals output by optical signal processing devices to achieve wavelength-independent, direction-independent, and non-blocking Optical signal landing function; because the reconfigurable optical add/drop multiplexer in the embodiment of this application does not use a splitter, it can avoid the path difference caused by the splitter; at the same time, a single optical cross-connect device is used.
- FIG. 3 shows a schematic structural diagram of a reconfigurable optical add/drop multiplexer provided by an embodiment of the present application.
- the reconfigurable optical add/drop multiplexer includes: at least two optical signal processing devices 31 and at least one optical cross-connect device 32.
- the light direction is used to indicate the path between the optical network nodes in the optical network.
- the optical network node a corresponds to four optical directions, where the first optical direction refers to the path between the optical network node a and the optical network node b, and the second optical direction refers to the optical network node.
- the path between a and the optical network node c, the optical direction refers to the path between the optical network node a and the optical network node d, and the optical direction refers to the path between the optical network node a and the optical network node e.
- different optical signal processors 31 correspond to different light directions, that is, different optical signal processors 31 are used to process optical signals in different light directions.
- the reconfigurable optical add/drop multiplexer shown in FIG. 3 is applied to the optical network node a shown in FIG. 1, and the first optical signal processing device 31 is used to process the optical network node a and the optical network node a b.
- the second optical signal processing device 31 is used to process the optical signal between the optical network node a and the optical network node c, and the second optical signal processing device 31 is used to process the optical network node a and the optical network node c.
- the second optical signal processing device 31 is used to process the optical signal between the optical network node a and the optical network node e.
- the embodiment of the present application only takes the four optical directions corresponding to the optical network node as an example for schematic description, but does not constitute a limitation on this.
- each optical direction of an optical network node may include an ingress direction and an egress direction, where the ingress direction is the incident optical signal of the optical network node.
- the direction that is, the downstream direction of the optical signal
- the egress direction is the output direction of the optical signal of the optical network node (that is, the upstream direction of the optical signal).
- the first light direction of the optical network node a includes the egress direction of a ⁇ b and the ingress direction of b ⁇ a.
- each optical signal processing device 31 includes a wavelength selection switch 311 and a filter 312.
- the wavelength selective switch 311 is used to perform wavelength allocation on the input dense wavelength division multiplexed optical signal and then input to the filter 312, and the filter 312 is used for the output of the wavelength selective switch 311
- the optical signal is separated into a single-channel optical signal.
- the filter 312 is used to multiplex multiple single-channel optical signals output by the optical cross-connect device 32 and then input the wavelength selection switch 311.
- the wavelength selection switch 311 is used to perform the optical signal output by the filter 312. Output after the wavelength is combined.
- the optical cross-connect device includes N upper ports and N lower ports, and the upper port and the lower port can be configured to achieve one-to-one communication between any ports (the upper ports cannot be connected one-to-one, and the lower ports One-to-one communication is not possible), and the optical cross-connect device is connected to the filters in each light direction through N upper ports, and connected to the optical conversion unit through the lower ports.
- the filters 312 in the first light direction, the second light direction, the third light direction, and the fourth light direction are all connected to the upper port of the optical cross-connect device 32, and the optical cross-connect The upper port of the device 32 is connected to the optical conversion unit 33.
- the single-channel optical signal output by the filter is input to the upper port of the optical cross-connect device, and the optical cross-connect device outputs the signal to the connected optical conversion unit through any lower port.
- Single-channel optical signal realizing optical signal landing.
- any lower port can be connected to any one of the upper ports through control (for example, a configuration command is sent to the optical cross-connect device, and the optical cross-connect device connects the lower port with the designated upper port according to the configuration command ), and the upper port is connected to filters corresponding to different optical directions. Therefore, when the lower port receives the single-channel optical signal output by the optical conversion unit, the single-channel optical signal can be transmitted to any one of the upper ports, so that the single The channel optical signal enters any optical direction to achieve direction-independent optical signal landing; at the same time, since a single-channel optical signal can enter any filter channel in any direction, it can achieve wavelength-independent optical signal landing.
- the lower port can form a 1:1 full mapping with the upper port, that is, there will be no conflicts between different channels in different directions, thereby realizing non-blocking optical The signal landed.
- the reconfigurable optical add/drop multiplexer provided by the embodiments of the present application is provided with a corresponding optical signal processing device for each optical direction, thereby passing the wavelength selection switch and filter in the optical processing device, Separate the input DWDM optical signal into a single-channel optical signal, and use an optical cross-connect device to land the single-channel optical signal output by the optical signal processing device to achieve wavelength-independent, direction-independent, and non-blocking optical signals.
- Signal landing function the reconfigurable optical add/drop multiplexer provided in the embodiment of the application does not need to be equipped with a splitter, and no additional optical amplifier array is required. Under the condition of ensuring path loss, the reconfigurable optical add/drop is reduced The structural complexity of the multiplexer.
- the wavelength separation of the DWDM optical signal in each optical direction is realized, and other wavelengths that cause interference to the channel can be filtered out, making the reconfigurable optical add/drop multiplexer It can support the landing of optical signals of incoherent wavelengths.
- each wavelength selective switch includes a first wavelength selective switch and a second wavelength selective switch. Switches are used to process optical signals in the incoming and outgoing directions respectively.
- FIG. 4 shows a schematic structural diagram of a reconfigurable optical add/drop multiplexer provided by another embodiment of the present application.
- each light direction includes a first wavelength selective switch 411 and a second wavelength selective switch 412.
- the first wavelength selective switch 411 includes a first input port 411a and a plurality of first output ports 411b.
- the first wavelength selective switch 411 is used to receive the DWDM optical signal input in the incoming direction through the first input port 411a, and follow the wavelength The DWDM optical signal is distributed to different first output ports 411b.
- the second wavelength selective switch 412 includes a second output port 412a and a plurality of second input ports 412b.
- the second wavelength selective switch 412 is used to combine the optical signals input from the second input ports 412b into DWDM optical signals and pass the second
- the output port 412a outputs the DWDM optical signal in the outgoing direction, thereby transmitting the DWDM optical signal to the optical network node corresponding to the optical direction.
- the dense wavelength division multiplexing optical signal received by the first wavelength selective switch 411 and the dense wavelength division multiplexing optical signal output by the second wavelength selective switch 412 are the same type of optical signals, and the content included in the optical signals may be different .
- the optical signal assigned to the first output port by the first wavelength selective switch is a single-channel optical signal
- the single-channel optical signal is a single-wavelength optical signal, or a multi-wavelength optical signal composed of multiple wavelengths (superchannel ).
- the reconfigurable optical add/drop multiplexer corresponds to m optical directions
- m- in the first wavelength selective switch in each optical direction One first output port is respectively connected to one of the second input ports of the second wavelength selection switch in other light directions one to one.
- a first output port of the first wavelength selective switch in the first optical direction is One of the second input ports of the second wavelength selective switch in the direction of the light is connected; the other first output port of the first wavelength selective switch in the first light direction is connected to the second of the second wavelength selective switch in the third light direction
- the input port is connected; another first output port of the first wavelength selective switch in the first light direction is connected to a second input port of the second wavelength selective switch in the fourth light direction, that is, the first output port in the first light direction
- the three first output ports of the wavelength selective switch are connected to the second input ports of the second wavelength selective switch in other light directions.
- the three first output ports 411b of the first wavelength selective switch 411 and the second input port 412b of the second wavelength selective switch 412 in the second light direction are respectively
- the second input port 412b of the second wavelength selective switch 412 in the third light direction and the second input port 412b of the second wavelength selective switch 412 in the fourth light direction are connected.
- the optical signal separated from the first optical direction can be routed to the second, third, and fourth optical directions, realizing wavelength routing between different optical directions.
- the filter 42 in each optical direction includes: a downstream input port 421a, a plurality of downstream output ports 421b corresponding to the downstream input port 421a, and an upstream output port 422a, and A plurality of upstream input ports 422b corresponding to the upstream output port 422a.
- the downstream input port 421a is connected to the first output port 411b of the first wavelength selective switch 411, and the downstream output port 421b is connected to the upper port of the optical cross-connect device 43.
- the filter 42 separates (the first wavelength selective switch 411) the optical signal (the DWDM optical signal allocated according to the wavelength) output from the first output port 411b into multiple single-channel optical signals, And output to the upper port of the optical cross-connect device 43 through a plurality of downstream output ports 421b.
- the upstream output port 422a is connected to the second input port 412b of the second wavelength selective switch 412, and the upstream input port 422b is connected to the upper port of the optical cross-connect device 43.
- the filter 42 multiplexes the single-channel optical signal input from the multiple upstream input ports 422b to the same optical channel (that is, merges into the same optical fiber), and then passes the upstream output port 422b to the first optical channel.
- the two input ports 412b output the multiplexed optical signal.
- the second wavelength selective switch can combine the optical signals of each light direction into DWDM Output after optical signal.
- the filter can be a fixed filter or a tunable filter.
- a fixed filter the wavelength of each port of the filter is fixed, and when a tunable filter is used, the wavelength of each port of the filter is fixed.
- the wavelength is configurable.
- each upstream input port of the filter is paired with the upper port of the optical cross-connect device One connection, so as to transmit the separated single-channel optical signal to the optical cross-connect device; each downstream output port of the filter is connected to the upper port of the optical cross-connect device one-to-one, so that the receiving optical conversion unit passes through the optical cross-connect device Single-channel optical signal input from the lower port.
- the number of ports of the optical cross-connect device selected in the reconfigurable optical add/drop multiplexer is related to the number of light directions and the number of wavelengths corresponding to each light direction.
- the reconfigurable optical add/drop multiplexer includes an optical cross-connect device, and the optical direction is m, and each optical direction corresponds to an optical signal of n wavelengths, the optical cross-connect device The upper port and the lower port are m ⁇ n.
- the first wavelength selective switch includes at least m first output ports
- the second wavelength selective switch includes at least m second input ports
- the filter includes at least n upstream input ports and at least n downstream output ports .
- a 2560:2560 optical cross-connect device is installed in the reconfigurable optical add/drop multiplexer to realize the connection of optical signals with 64 wavelengths in each optical direction in 20 optical directions. Into.
- the use of N:N optical cross-connect devices can significantly increase the number of landing ports and realize the use of a single device to complete multi-wavelength landing; at the same time, the use of a single optical cross-connect device can reduce the need for wavelength selective switching in each optical direction.
- more ports of the wavelength selective switch can be used to implement routing in different optical directions, which is beneficial to improve the scalability of the system.
- i optical cross-connect devices are provided in the reconfigurable optical add-drop multiplexer.
- the upper port of each optical cross-connect device is connected one-to-one with the target number of upstream input ports in the filter, wherein the target number of upstream input ports account for 1/i of the total number of upstream input ports in the filter; and, the upper port of each optical cross-connect device is connected to the target number of downstream output ports in the filter one-to-one, where the target number of output ports account for the first filter 1/i of the total output port, where the target number of downstream output ports account for 1/i of the total number of downstream output ports in the filter.
- the reconfigurable optical add/drop multiplexer when they are the first optical cross-connect device 61 and the second optical cross-connect device.
- the first optical cross-connect device 61 At 62 o'clock, half of the upstream input ports of the filter 61 are connected to the upper port of the first optical cross-connect device 61 in each optical direction, and the other half of the upstream input ports are connected to the upper port of the second optical cross-connect device 62; in each optical direction
- Half of the downstream output ports of the filter 61 are connected to the upper part of the first optical cross-connect device 61, and the other half of the downstream output ports are connected to the upper port of the second optical cross-connect device 62.
- each optical cross-connect device when i optical cross-connect devices are provided in the reconfigurable optical add/drop multiplexer, and the optical direction is m, and each optical direction corresponds to an optical signal of 64 wavelengths, each optical cross-connect device Both the upper port and the lower port are m ⁇ n/i.
- two 1280:1280 optical signals can be set in the reconfigurable optical add/drop multiplexer.
- Cross-connect devices or, set up four 640:640 optical cross-connect devices in the reconfigurable optical add/drop multiplexer.
- the system can complete the wavelength connection through the optical cross-connect devices without optical failure.
- the problem of the failure of the optical cross-connect device causing the entire system to be unavailable when only a single optical cross-connect device is installed.
- an exemplary embodiment is used to describe the processing procedure of the upstream optical signal.
- FIG. 7 shows a flowchart of an optical signal processing method provided by an embodiment.
- the method is used in the reconfigurable optical add/drop multiplexer provided in the foregoing embodiments.
- the method includes the following steps.
- Step S701 The wavelength selection switch in the optical signal processing device receives the input DWDM optical signal.
- the reconfigurable optical add/drop multiplexers of different optical network nodes are connected by optical fibers.
- the current optical network node grounds the optical signal transmitted by other optical network nodes (that is, the optical signal downstream process)
- the first pass The wavelength selective switch in the optical direction receives the optical signal transmitted by the optical network node, and the optical signal may be a DWDM optical signal.
- the wavelength selective switch includes a first wavelength selective switch for processing incoming optical signals, and the first wavelength selective switch includes a first input port and a plurality of first output ports.
- the wavelength selective switch receives the DWDM optical signal input in the incoming direction through the first input port.
- Step S702 The wavelength selective switch performs wavelength allocation on the dense wavelength division multiplexing optical signal, and inputs the optical signal after the wavelength allocation to the filter in the optical signal processing device.
- the first wavelength selective switch distributes the received DWDM optical signals to different first output ports according to wavelengths, so that the optical signals are input to the filter through the first output port in.
- the first wavelength selective switch may also transmit the wavelength-allocated optical signal to the second wavelength selective switch corresponding to other optical directions through the first output port, so as to realize optical signal routing.
- step S703 the filter separates the optical signal after the wavelength allocation into a single-channel optical signal, and inputs the single-channel optical signal to the upper port of the optical cross-connect device.
- the filter in the downstream direction, includes a downstream input port and a plurality of downstream output ports corresponding to the downstream input port.
- the filter receives the wavelength-allocated light output by the wavelength selection switch through the downstream input port.
- the signal is separated into multiple single-channel optical signals (single-wavelength optical signals or multi-wavelength optical signals), so that the single-channel optical signals of the division are input into the upper port of the optical cross-connect device through multiple downstream output ports.
- Step S704 The optical cross-connect device grounds the single-channel optical signal through the lower port.
- the optical cross-connect device can receive single-channel optical signals from multiple optical directions, and further control the connection between the upper port and the lower port.
- the connection of different light directions realizes the landing of light signals.
- FIG. 8 shows a flowchart of an optical signal processing method provided in another embodiment.
- the method is used in the reconfigurable optical add/drop multiplexer provided in the foregoing embodiments.
- the method includes the following steps.
- Step S801 The optical cross-connect device receives the single-channel optical signal output by the optical conversion unit through the lower port.
- the lower port of the optical cross-connect device is connected to the optical conversion unit of the optical network node.
- the optical signal is input to the lower port of the optical cross-connect device through the optical conversion unit.
- Channel optical signal is input to the lower port of the optical cross-connect device through the optical conversion unit.
- Step S802 the optical cross-connect device inputs a single-channel optical signal to the filter in the optical signal processing device through the upper port.
- the optical cross-connect device can communicate with any upper port through the lower port, the optical cross-connect device can input the single-channel optical signal into the filter of any optical direction, so that the single-channel optical signal can be transmitted to any Light direction.
- Step S803 The filter multiplexes the input multiple single-channel optical signals, and inputs the multiplexed optical signals into the wavelength selection switch in the optical signal processing device.
- the wavelength selection switch includes a second wavelength selection switch for processing the outgoing direction optical signal
- the filter includes a plurality of uplink input ports and uplink output ports corresponding to the plurality of uplink input ports
- the upstream input terminal is connected with the upper port of the optical cross-connect device
- the upstream output terminal is connected with the second input port of the second wavelength selective switch.
- the filter multiplexes single-channel optical signals input from multiple uplink input ports to the same optical channel, and outputs the multiplexed optical signal to the second input port of the second wavelength selection switch through the uplink output port.
- step S804 the wavelength selective switch performs wavelength combination on the multiplexed optical signal and outputs it.
- the second wavelength selective switch when the second wavelength selective switch is connected to the first wavelength selective switch in other optical directions to implement wavelength routing, the second wavelength selective switch responds to optical signals in the optical direction and other optical directions. Perform wavelength combination (received through multiple second input ports) to output the combined DWDM optical signal.
- the combined optical signal is transmitted through the optical fiber to the optical network node in the optical direction, and the optical network node uses the reconfigurable optical add/drop multiplexer to land the optical signal using the optical processing method shown in Figure 7 .
- FIG. 9 shows a schematic structural diagram of an optical network provided by an embodiment.
- the optical network includes at least two optical network nodes.
- the optical network includes a first optical network node 91, a second optical network node 92, a third optical network node 93, a fourth optical network node 94, and a fifth optical network node 95 as an example for description.
- each optical network node in the optical network is provided with a reconfigurable optical add-drop multiplexer, and the reconfigurable optical add-drop multiplexer can adopt any of the reconfigurable optical add-drop multiplexers provided in the above embodiments. Add/drop multiplexer.
- the optical network nodes are connected by reconfigurable optical add/drop multiplexers and optical fibers between the optical network nodes.
- the optical signal output by the optical conversion unit in the optical network node can be transmitted to any optical network node in the optical network through the reconfigurable optical add/drop multiplexer.
- the optical network node can be reconfigured
- the optical add/drop multiplexer can input the optical signals from various optical directions into the optical conversion unit to finally realize the wavelength routing of different optical directions, and the landing of wavelength-independent, direction-independent, and non-blocking optical signals.
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- 一种可重构光分插复用器,所述可重构光分插复用器包括:至少两个光信号处理器件以及至少一个光交叉连接器件,其中,不同光信号处理器件对应不同光方向;各个所述光信号处理器件中包括波长选择开关和滤波器,所述波长选择开关用于对输入的密集波分复用光信号进行波长分配后输入所述滤波器,所述滤波器用于将所述波长选择开关输出的光信号分离为单通道光信号,以及所述滤波器用于将所述光交叉连接器件输出的多个单通道光信号复用后输入所述波长选择开关,所述波长选择开关用于将所述滤波器输出的光信号进行波长合并后输出;及所述光交叉连接器件包括N个上部端口和N个下部端口,所述光交叉连接器件通过所述上部端口与各个所述光信号处理器件中的所述滤波器相连,所述下部端口与光转换单元相连,所述光交叉连接器件用于对所述滤波器输出的所述单通道光信号进行落地,以及通过所述上部端口将所述光转换单元输出的单通道光信号输入所述滤波器。
- 根据权利要求1所述的可重构光分插复用器,其特征在于,所述波长选择开关包括第一波长选择开关和第二波长选择开关;所述第一波长选择开关包括第一输入端口和多于一个的第一输出端口,所述第一波长选择开关用于通过所述第一输入端口接收入局方向输入的所述密集波分复用光信号,并按照波长将所述密集波分复用光信号分配到不同的所述第一输出端口;及所述第二波长选择开关包括第二输出端口和多于一个的第二输入端口,所述第二波长选择开关用于将各个所述第二输入端口输入的光信号合并为所述密集波分复用光信号,并通过所述第二输出端口向出局方向输出所述密集波分复用光信号;其中,所述入局方向和所述出局方向属于同一光方向,且所述入局方向和所述出局方向的方向相反。
- 根据权利要求2所述的可重构光分插复用器,其特征在于,所述可重构光分插复用器对应m个光方向,各个光方向上所述第一波长选择开关中的m-1个所述第一输出端口分别与其他光方向上所述第二波长选择开关中的一 个所述第二输入端口一对一连接。
- 根据权利要求2所述的可重构光分插复用器,其特征在于,所述滤波器包括下行输入端口、与所述下行输入端口对应的多于一个的下行输出端口,以及上行输出端口、与所述上行输出端口对应的多于一个的上行输入端口;所述下行输入端口与所述第一波长选择开关的所述第一输出端口相连,所述下行输出端口与所述光交叉连接器件的所述上部端口相连,所述滤波器用于将所述第一输出端口输出的按照波长分配的所述密集波分复用光信号分离为多个单通道光信号,并通过多于一个的所述下行输出端口输出至所述光交叉连接器件的所述上部端口;及所述上行输出端口与所述第二波长选择开关的所述第二输入端口相连,所述上行输入端口与所述光交叉连接器件的所述上部端口相连,所述滤波器还用于将多于一个的所述上行输入端口输入的单通道光信号复用到同一光通道,并通过所述上行输出端口向所述第二输入端口输出复用后的光信号。
- 根据权利要求4所述的可重构光分插复用器,其特征在于,所述可重构光分插复用器中包括一个所述光交叉连接器件;所述滤波器的所述上行输入端口与所述光交叉连接器件的所述上部端口一对一连接;及所述滤波器的所述下行输出端口与所述光交叉连接器件的所述上部端口一对一连接。
- 根据权利要求5所述的可重构光分插复用器,其特征在于,当所述可重构光分插复用器对应m个光方向,且每个光方向对应n个波长的光信号时,所述N=m×n。
- 根据权利要求4所述的可重构光分插复用器,其特征在于,所述可重构光分插复用器中包括i个所述光交叉连接器件,i为大于1的整数;每个所述光交叉连接器件的所述上部端口与所述滤波器中目标数量的上行输入端口一对一连接,所述目标数量的上行输入端口占所述滤波器中上行输入端口总数的1/i;及每个所述光交叉连接器件的所述上部端口与所述第二滤波器中目标数量的下行输出端口一对一连接,所述目标数量的下行输出端口占所述滤波器中下行输出端口总数的1/i。
- 根据权利要求7所述的可重构光分插复用器,其特征在于,当所述可重构光分插复用器对应m个光方向,且每个光方向对应n个波长的光信号时,所述N=m×n÷i。
- 一种光网络,所述光网络中包括:至少两个光网络节点;各个所述光网络节点中设置有权利要求1至8任一项所述的可重构光分插复用器,且所述光网络节点之间通过光纤相连。
- 一种光信号处理方法,由可重构光分插复用器执行,所述可重构光分插复用器包括至少两个光信号处理器件以及至少一个光交叉连接器件,不同光信号处理器件对应不同光方向,所述方法包括:所述光信号处理器件中的波长选择开关接收输入的密集波分复用光信号;所述波长选择开关对所述密集波分复用光信号进行波长分配,并将波长分配后的光信号输入所述光信号处理器件中的滤波器;所述滤波器将所述波长分配后的光信号分离为单通道光信号,并将所述单通道光信号输入所述光交叉连接器件的上部端口;及所述光交叉连接器件通过下部端口对所述单通道光信号进行落地。
- 根据权利要求10所述的方法,其特征在于,所述波长选择开关包括第一波长选择开关,所述第一波长选择开关包括第一输入端口和多于一个的第一输出端口,所述第一输出端口与所述滤波器相连;所述光信号处理器件中的波长选择开关接收输入的密集波分复用光信号,包括:所述第一波长选择开关通过所述第一输入端口接收入局方向输入的所述密集波分复用光信号;所述波长选择开关对所述密集波分复用光信号进行波长分配,并将波长分配后的光信号输入所述光信号处理器件中的滤波器,包括:所述第一波长选择开关按照波长将所述密集波分复用光信号分配到不同的所述第一输出端口。
- 根据权利要求11所述的方法,其特征在于,所述滤波器包括下行输入端口以及与所述下行输入端口对应的多于一个的下行输出端口;所述滤波器将所述波长分配后的光信号分离为单通道光信号,并将所述单通道光信号输入所述光交叉连接器件的上部端口,包括:所述滤波器通过所述下行输入端口接收所述第一输出端口输出的所述波长分配后的光信号;及所述滤波器将所述波长分配后的光信号分离为多于一个的单通道光信号,并通过多于一个的所述下行输出端口输出至所述光交叉连接器件的所述上部端口。
- 一种光信号处理方法,由可重构光分插复用器执行,所述可重构光分插复用器包括至少两个光信号处理器件以及至少一个光交叉连接器件,不同光信号处理器件对应不同光方向,所述方法包括:所述光交叉连接器件通过下部端口接收光转换单元输出的单通道光信号;所述光交叉连接器件通过上部端口,向所述光信号处理器件中的滤波器输入所述单通道光信号;所述滤波器对输入的多于一个的所述单通道光信号进行复用,并将复用后的光信号输入所述光信号处理器件中的波长选择开关;及所述波长选择开关对所述复用后的光信号进行波长合并后输出。
- 根据权利要求13所述的方法,其特征在于,所述波长选择开关包括第第二波长选择开关,所述第二波长选择开关包括第二输出端口和多于一个的第二输入端口,所述滤波器包括上行输出端口以及与所述上行输出端口对应的多于一个的上行输入端口;所述滤波器对输入的多于一个的所述单通道光信号进行复用,并将复用后的光信号输入所述光信号处理器件中的波长选择开关,包括:所述滤波器将多于一个的所述上行输入端口输入的单通道光信号复用到同一光通道,并通过所述上行输出端口向所述第二波长选择开关的所述第二输入端口输出所述复用后的光信号;所述波长选择开关对所述复用后的光信号进行波长合并后输出,包括:所述第二波长选择开关将各个所述第二输入端口输入的光信号合并为密集波分复用光信号,并通过所述第二输出端口向出局方向输出所述密集波分复用光信号。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101227247A (zh) * | 2007-10-30 | 2008-07-23 | 中兴通讯股份有限公司 | 实现灵活波长调度的可配置光分插复用装置 |
CN101420286A (zh) * | 2007-10-23 | 2009-04-29 | 中兴通讯股份有限公司 | 实现灵活波长调度的可配置光分插复用装置 |
CN101610129A (zh) * | 2009-07-09 | 2009-12-23 | 中兴通讯股份有限公司 | 实现完全无阻的波长无关性的可重构光分插复用装置 |
US20150208146A1 (en) * | 2014-01-17 | 2015-07-23 | Tellabs Operations, Inc. | Methods and Apparatus for Providing Configuration Discovery Using Intra-Nodal Test Channel |
CN105474565A (zh) * | 2013-09-09 | 2016-04-06 | 华为技术有限公司 | 用于可扩展可重构光分插复用器的光子开关芯片 |
CN109802744A (zh) * | 2019-03-20 | 2019-05-24 | 深圳市腾讯计算机系统有限公司 | 可重构光分插复用器、光网络及光信号处理方法 |
Family Cites Families (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE523238C2 (sv) * | 2001-07-13 | 2004-04-06 | Transmode Systems Ab | Optiskt system och metod i ett optiskt system |
US7340175B2 (en) * | 2002-01-18 | 2008-03-04 | Nec Corporation | Non-uniform optical waveband aggregator and deaggregator and hierarchical hybrid optical cross-connect system |
US7173902B2 (en) * | 2002-03-29 | 2007-02-06 | Bay Microsystems, Inc. | Expansion of telecommunications networks with automatic protection switching |
US7437075B2 (en) * | 2002-08-27 | 2008-10-14 | Lucent Technologies Inc. | Integrated reconfigurable optical add/drop multiplexer |
US7254327B1 (en) * | 2003-01-31 | 2007-08-07 | Ciena Corporation | Switching status and performance monitoring technology for wavelength selective switch and optical networks |
US20040190901A1 (en) * | 2003-03-29 | 2004-09-30 | Xiaojun Fang | Bi-directional optical network element and its control protocols for WDM rings |
JP4530821B2 (ja) * | 2004-08-16 | 2010-08-25 | 富士通株式会社 | 光分岐挿入装置 |
JP4382635B2 (ja) * | 2004-11-10 | 2009-12-16 | 富士通株式会社 | 光伝送装置 |
US7983560B2 (en) * | 2005-10-11 | 2011-07-19 | Dynamic Method Enterprises Limited | Modular WSS-based communications system with colorless add/drop interfaces |
JP4854565B2 (ja) * | 2007-03-30 | 2012-01-18 | 日本電信電話株式会社 | 光クロスコネクト装置 |
US8849115B2 (en) * | 2008-03-11 | 2014-09-30 | Ciena Corporation | Directionless optical architecture and highly available network and photonic resilience methods |
US8625994B2 (en) * | 2008-03-11 | 2014-01-07 | Ciena Corporation | Directionless reconfigurable optical add-drop multiplexer systems and methods |
EP2141842B1 (fr) * | 2008-06-30 | 2013-07-31 | Alcatel Lucent | Dispositif de commutation de signaux optiques |
CN101809912A (zh) * | 2008-09-26 | 2010-08-18 | 动力方法企业有限公司 | 具有无色插入/分出接口的基于模块化wss的通信系统 |
US8554074B2 (en) * | 2009-05-06 | 2013-10-08 | Ciena Corporation | Colorless, directionless, and gridless optical network, node, and method |
US8538267B2 (en) * | 2009-10-09 | 2013-09-17 | Nec Laboratories America, Inc. | ROADM transponder aggregator systems and methods of operation |
WO2011133254A2 (en) * | 2010-04-21 | 2011-10-27 | Nec Laboratories America, Inc. | Roadm transponder aggregator systems and methods of operation |
US20110262143A1 (en) * | 2010-04-21 | 2011-10-27 | Nec Laboratories America, Inc. | Roadm systems and methods of operation |
JP5614129B2 (ja) * | 2010-06-30 | 2014-10-29 | 富士通株式会社 | 光分岐挿入装置 |
JP5682256B2 (ja) * | 2010-11-24 | 2015-03-11 | 富士通株式会社 | 光挿入装置および光分岐装置 |
EP2615755B1 (en) * | 2012-01-12 | 2017-05-10 | Alcatel Lucent | Optical switching node for a WDM optical network |
US9106983B2 (en) * | 2012-04-02 | 2015-08-11 | Nec Laboratories America, Inc. | Reconfigurable branching unit for submarine optical communication networks |
KR20130126808A (ko) * | 2012-04-24 | 2013-11-21 | 한국전자통신연구원 | 수동형 광 네트워크 시스템 및 그의 광 신호 송수신 방법과 광 회선 종단 장치 |
JP2014022865A (ja) * | 2012-07-17 | 2014-02-03 | Nec Corp | 光信号分岐装置、および光信号挿入装置 |
EP2757714A1 (en) * | 2013-01-18 | 2014-07-23 | Xieon Networks S.à.r.l. | Photonic cross-connect with reconfigurable add-dropfunctionality |
US10135560B2 (en) * | 2013-06-22 | 2018-11-20 | Mark E. Boduch | Optical devices for the construction of compact optical nodes |
EP2991253A1 (en) | 2014-08-25 | 2016-03-02 | Xieon Networks S.à r.l. | Reconfigurable add/drop multiplexing in optical networks |
WO2016060594A1 (en) * | 2014-10-13 | 2016-04-21 | Telefonaktiebolaget L M Ericsson (Publ) | An optical wavelength selective switch, an optical network node, an optical network and methods therein |
JP6468058B2 (ja) | 2015-04-30 | 2019-02-13 | 富士通株式会社 | 光スイッチモジュール、これを用いた光中継装置、及び方路拡張方法 |
JP2017073739A (ja) * | 2015-10-09 | 2017-04-13 | 富士通株式会社 | 伝送装置及び光ファイバの接続確認方法 |
JP6607057B2 (ja) | 2016-01-28 | 2019-11-20 | 富士通株式会社 | 伝送装置、伝送システム、及び伝送方法 |
CN107359938B (zh) * | 2016-05-09 | 2019-09-20 | 腾讯科技(深圳)有限公司 | 数据中心传输系统、系统中控制的实现方法和装置 |
US10277352B2 (en) * | 2016-05-24 | 2019-04-30 | Ciena Corporation | Noise suppression and amplification systems and methods for colorless optical add/drop devices |
-
2019
- 2019-03-20 CN CN201910214799.7A patent/CN109802744B/zh active Active
-
2020
- 2020-02-20 JP JP2021539986A patent/JP2022517966A/ja active Pending
- 2020-02-20 EP EP20772828.8A patent/EP3944529A4/en active Pending
- 2020-02-20 WO PCT/CN2020/076074 patent/WO2020186958A1/zh unknown
- 2020-02-20 KR KR1020217014158A patent/KR102378490B1/ko active IP Right Grant
-
2021
- 2021-05-17 US US17/322,695 patent/US11909514B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101420286A (zh) * | 2007-10-23 | 2009-04-29 | 中兴通讯股份有限公司 | 实现灵活波长调度的可配置光分插复用装置 |
CN101227247A (zh) * | 2007-10-30 | 2008-07-23 | 中兴通讯股份有限公司 | 实现灵活波长调度的可配置光分插复用装置 |
CN101610129A (zh) * | 2009-07-09 | 2009-12-23 | 中兴通讯股份有限公司 | 实现完全无阻的波长无关性的可重构光分插复用装置 |
CN105474565A (zh) * | 2013-09-09 | 2016-04-06 | 华为技术有限公司 | 用于可扩展可重构光分插复用器的光子开关芯片 |
US20150208146A1 (en) * | 2014-01-17 | 2015-07-23 | Tellabs Operations, Inc. | Methods and Apparatus for Providing Configuration Discovery Using Intra-Nodal Test Channel |
CN109802744A (zh) * | 2019-03-20 | 2019-05-24 | 深圳市腾讯计算机系统有限公司 | 可重构光分插复用器、光网络及光信号处理方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3944529A4 * |
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