Reconfigurable optical add-drop multiplexer, optical network, and optical signal processing method

An optical signal processing method, performed by a reconfigurable optical add-drop multiplexer, the reconfigurable optical add-drop multiplexer comprising at least one optical cross-connect device comprising N upper ports and N lower ports and at least two optical signal processing devices corresponding to different optical directions, the method comprising:

• receiving, by a wavelength-selective switch in each optical signal processing device, inputted dense wavelength division multiplexing optical signals;
• performing, by the wavelength-selective switch, wavelength-based allocation on the dense wavelength division multiplexing optical signals, and inputting the optical signals after the wavelength-based allocation into a filter in the optical signal processing device;
• separating, by the filter, the optical signals after the wavelength-based allocation into single-channel optical signals, and inputting the single-channel optical signals into upper ports of the optical cross-connect device, wherein:
• the at least one optical cross-connect device comprise i optical cross-connect devices, i being an integer greater than 1;
• the upper ports of each of the optical cross-connect devices are connected to a target quantity of uplink input ports in the filter in a one-to-one manner, and the target quantity of uplink input ports accounts for 1/i of a total of uplink input ports in the filter;
• the upper ports of each of the optical cross-connect devices are connected to a target quantity of downlink output ports in the filter in a one-to-one manner, and the target quantity of downlink output ports accounts for 1/i of a total of downlink output ports in the filter;
• N=m×n÷i, wherein the reconfigurable optical add-drop multiplexer corresponds to m optical directions and each optical direction corresponds to optical signals of n wavelengths;
• the wavelength-selective switch comprises a first wavelength-selective switch and a second wavelength-selective switch;
• the first wavelength-selective switch comprises a first input port and more than one first output port, and the first wavelength-selective switch is configured to receive, through the first input port, the dense wavelength division multiplexing optical signals inputted in an ingress direction, and allocate the dense wavelength division multiplexing optical signals to different first output ports according to wavelengths;
• and
• the second wavelength-selective switch comprises a second output port and more than one second input port, and the second wavelength-selective switch is configured to combine optical signals inputted from the second input ports into the dense wavelength division multiplexing optical signals, and output the dense wavelength division multiplexing optical signals in an egress direction through the second output port, wherein
• the ingress direction and the egress direction belong to the same optical direction, and the ingress direction and the egress direction are opposite directions;
• and
• dropping, by the optical cross-connect device, the single-channel optical signals through lower ports.

An optical signal processing method, performed by a reconfigurable optical add-drop multiplexer, the reconfigurable optical add-drop multiplexer comprising and at least one optical cross-connect device comprising N upper ports and N lower ports and at least two optical signal processing devices corresponding to different optical directions, the method comprising:

• receiving, by the optical cross-connect device through lower ports, more than one single-channel optical signal outputted by an optical transform unit;
• inputting, by the optical cross-connect device through upper ports, the more than one single-channel optical signal into a filter in any optical signal processing device;
• multiplexing, by the filter, the inputted more than one single-channel optical signal, and inputting multiplexed optical signals into a wavelength-selective switch in the optical signal processing device, wherein:
• the at least one optical cross-connect device comprise i optical cross-connect devices, i being an integer greater than 1;
• the upper ports of each of the optical cross-connect devices are connected to a target quantity of uplink input ports in the filter in a one-to-one manner, and the target quantity of uplink input ports accounts for 1/i of a total of uplink input ports in the filter;
• the upper ports of each of the optical cross-connect devices are connected to a target quantity of downlink output ports in the filter in a one-to-one manner, and the target quantity of downlink output ports accounts for 1/i of a total of downlink output ports in the filter;
• N=m×n÷i, wherein the reconfigurable optical add-drop multiplexer corresponds to m optical directions and each optical direction corresponds to optical signals of n wavelengths;
• the wavelength-selective switch comprises a first wavelength-selective switch and a second wavelength-selective switch;
• the first wavelength-selective switch comprises a first input port and more than one first output port, and the first wavelength-selective switch is configured to receive, through the first input port, the dense wavelength division multiplexing optical signals inputted in an ingress direction, and allocate the dense wavelength division multiplexing optical signals to different first output ports according to wavelengths;
• and
• the second wavelength-selective switch comprises a second output port and more than one second input port, and the second wavelength-selective switch is configured to combine optical signals inputted from the second input ports into the dense wavelength division multiplexing optical signals, and output the dense wavelength division multiplexing optical signals in an egress direction through the second output port, wherein
• the ingress direction and the egress direction belong to the same optical direction, and the ingress direction and the egress direction are opposite directions;
• and
• performing, by the wavelength-selective switch, wavelength combination on the multiplexed optical signals and outputting the optical signals.