Dynamically switching queueing schemes for network switches
An example node includes a receiver, a switch circuit, and a transmitter. The receiver is configured to receive a first modulated optical signal including a first plurality of optical subcarriers, and supply a plurality of data streams based on the first plurality of optical subcarriers. Each of the data streams is associated with a corresponding one of the plurality of optical subcarriers. The switch circuit is configured to receive the data streams, and supply the data streams to a plurality of switch outputs. The transmitter is configured to receive the data streams, and supply a second modulated optical signal based on the data streams. The second modulated optical signal carries a second plurality of optical subcarriers. Each of the second plurality of optical subcarriers is associated with a corresponding one of the data streams.
1. A node for a communications network, comprising:
a receiver having a plurality of receiver outputs, wherein the receiver is configured to receive from the communications network a first modulated optical signal, comprising a received first plurality of optical subcarriers, and to supply a plurality of data streams, each of the plurality of data streams being a respective data stream detected by the receiver from a corresponding one of the received first plurality of optical subcarriers, and each of the plurality of receiver outputs supplying a respective one of the plurality of data streams;
a switch circuit having a plurality of switch inputs and a plurality of switch outputs, wherein each of the plurality of switch inputs is communicatively coupled to the receiver and configured to receive a respective one of the plurality of data streams supplied by the plurality of receiver outputs, and wherein each of the plurality of switch outputs is configured to supply a respective one of the plurality of data streams received at the plurality of switch inputs; and
a transmitter having a plurality of transmitter inputs, wherein each of the plurality of transmitter inputs is communicatively coupled to a corresponding one of the plurality of switch outputs and is configured to receive a corresponding one of the plurality of data streams supplied by the plurality of switch outputs,
wherein the transmitter is configured to supply to the communications network a second modulated optical signal based on the plurality of data streams received at the plurality of transmitter inputs, the second modulated optical signal carrying a second plurality of optical subcarriers, each of the second plurality of optical subcarriers being associated with a corresponding one of the plurality of data streams received at the plurality of transmitter inputs.
2. The node of claim 1 , wherein one of the received first plurality of optical subcarriers has a first frequency and is associated with one of the plurality of data streams, and one of the second plurality of optical subcarriers has a second frequency and is associated with said one of the plurality of data streams.
3. The node of claim 2 , wherein said one of the received first plurality of optical subcarriers carries information indicative of said one of the plurality of data streams, and said one of the second plurality of optical subcarriers carries the information indicative of said one of the plurality of data streams.
4. The node of claim 1 , wherein the switch circuit comprises a cross-point switch.
5. The node of claim 1 , wherein the receiver comprises:
an optical hybrid circuit configured to receive at least a portion of the first modulated optical signal and a local oscillator signal;
a photodiode circuit configured to receive mixing products output from the optical hybrid circuit based on said at least the portion of the first modulated optical signal and the local oscillator signal, and supply first electrical signals based on the mixing products;
analog-to-digital conversion circuitry configured to receive the first electrical signals and supply second electrical signals based on the first electrical signals, the second electrical signals being digital signals; and
a digital signal processor configured to output the plurality of data streams based on the second electrical signals.
6. The node of claim 5 , further comprising a local oscillator laser configured to supply the local oscillator signal.
7. The node of claim 1 , wherein the transmitter comprises:
a digital signal processor configured to receive the plurality of data streams and output a plurality of digital signals based on the plurality of data streams;
digital-to-analog conversion circuitry configured to output analog signals based on the digital signals;
a plurality of driver circuits configured to supply drive signals based on the analog signals;
a laser configured to supply an optical signal; and
a modulator configured to receive the optical signal and supply the second modulated optical signal based on the drive signals.
8. The node of claim 1 , wherein each of the received first plurality of optical subcarriers is a Nyquist subcarrier.
9. The node of claim 1 , wherein each of the second plurality of optical subcarriers is a Nyquist subcarrier.
10. The node of claim 1 , wherein, during a first time interval, the switch circuit has a first switch configuration, such that during the first time interval, a first one of the second plurality of optical subcarriers having a first frequency carries information associated with one of the plurality of data streams, and, during a second time interval, the switch circuit has a second switch configuration, such that a second one of the second plurality of subcarriers carries the information.
11. The node of claim 1 , wherein the switch circuit has a first switch configuration based on a first control signal supplied to the switch circuit and the switch circuit has a second switch configuration based on a second control signal supplied to the switch circuit.
12. A node for a communications network, comprising:
a receiver having a plurality of receiver outputs, wherein the receiver is configured to receive from the communications network a first modulated optical signal comprising a received first plurality of optical subcarriers, and to supply a plurality of data streams, each of the plurality of data streams being a respective data stream detected by the receiver from a corresponding one of the received first plurality of optical subcarriers, and each of the plurality of receiver outputs supplying a respective one of the plurality of data streams;
a switch circuit having a plurality of switch inputs and a plurality of switch outputs, wherein each of the plurality of switch inputs is communicatively coupled to the receiver and configured to receive a respective one of the plurality of data streams supplied by the plurality of receiver outputs, and wherein each of the plurality of switch outputs is configured to supply a respective one of the plurality of data streams received at the plurality of switch inputs; and
a first transmitter having a plurality of inputs, wherein each of the plurality of inputs of the first transmitter is communicatively coupled to a corresponding one of first ones of the plurality of switch outputs and is configured to receive a corresponding one of first ones of the plurality of data streams supplied by the plurality of switch outputs,
wherein the first transmitter is configured to supply to the communications network a second modulated optical signal based on said first ones the plurality of data streams received at the plurality of inputs of the first transmitter, the second modulated optical signal carrying a second plurality of optical subcarriers, each of the second plurality of optical subcarriers being associated with a corresponding one of said first ones the plurality of data streams received at the plurality of inputs of the first transmitter; and
a second transmitter having a plurality of inputs, wherein each of the plurality of inputs of the second transmitter is communicatively coupled to a corresponding one of second ones of the plurality of switch outputs and is configured to receive a corresponding one of second ones of the plurality of data streams supplied by the plurality of switch outputs,
wherein the second transmitter is configured to supply to the communications network a third modulated optical signal based on said second ones of the plurality of data streams received at the plurality of inputs of the second transmitter, the third modulated optical signal carrying a third plurality of optical subcarriers, each of the third plurality of optical subcarriers being associated with a corresponding one of the second ones of the plurality of data streams received at the plurality of inputs of the second transmitter.