Leaf switch module and optoelectronic switch
Various leaf switch modules including optical network interfaces, electrical network interfaces and packet processors are provided. Some of the leaf switch modules as described herein are adapted for upward transmission of signals from external client devices to an electrical fabric, and include O/E converters; other leaf switch modules are adapted for downward transmission of signals from an electrical fabric to external client devices, and include E/O converters. A third type of leaf switch as described herein is adapted for both upward and downward transmission of signals, and includes both types of converter. In addition to the leaf switch modules themselves, an optoelectronic switch containing a plurality of those leaf switches is also described.
1. A leaf switch module for use in an optoelectronic switch, the leaf switch module including:
a plurality of optical network interfaces, arranged to receive a plurality of optical signals, each optical signal received from an external client device;
a plurality of optical-to-electrical converters, each arranged to convert a respective optical signal of the plurality of optical signals into a corresponding electrical signal, to generate a plurality of electrical signals;
a plurality of electrical network interfaces; and
a packet processor arranged to switch each of the plurality of electrical signals towards a respective electrical network interface of the plurality of electrical network interfaces, each of the electrical network interfaces arranged to transmit a respective electrical signal of the plurality of electrical signals to an electrical fabric,
wherein an interface selected from among the electrical network interfaces and the optical network interfaces is provided by a configurable port including a first circuit configured to provide an electrical network interface and a second circuit configured to provide an optical network interface, and
wherein the configurable port is configured to have the first circuit selected to provide the electrical network interface or to have the second circuit selected to provide the optical network interface.
2. A leaf switch module according to claim 1 , including non-configurable ports, wherein:
the optical network interfaces are provided by a combination of non-configurable ports and configurable ports; and
the electrical network interfaces are provided by configurable ports.
3. A leaf switch module according to claim 1 , wherein the optical network interfaces, the optical-to-electrical converters, the packet processor and the electrical network interfaces are all part of the same integrated package.
4. A leaf switch module according to claim 1 , wherein the optical network interfaces are arranged to receive the respective optical signals from the external client device via a respective optical fibre.
5. A leaf switch module according to claim 1 , wherein the packet processor includes:
a plurality of downward-facing inputs, each configured to receive a respective electrical signal of the plurality of electrical signals;
a switching component; and
a plurality of upward-facing outputs,
wherein, once an electrical signal is received by a respective one of the downward-facing inputs of the packet processor, the switching component is configured to perform switching in an upward direction, in which that electrical signal is switched to a respective one of the plurality of upward-facing outputs, based on information contained in the electrical signal.
6. A leaf switch module according to claim 1 , wherein:
the packet processor is in the form of an electronic integrated circuit,
the optical-to-electrical converters are in the form of photodetectors which are located on one or more photonics chips, the photonics chips being coupled to the electronic integrated circuit, and
the one or more photonics chips and the electronic integrated circuit are integrated into a single module.
7. A leaf switch module according to claim 1 , further including a SerDes module coupled to the packet processor.
8. A leaf switch module according to claim 1 , further including a selector configured to select the first circuit or the second circuit.
9. A leaf switch module for use in an optoelectronic switch, the leaf switch module including:
a plurality of electrical network interfaces, each arranged to receive a respective electrical signal of a plurality of electrical signals from an electrical fabric;
a packet processor;
a plurality of electrical-to-optical converters; and
a plurality of optical network interfaces,
wherein:
the packet processor is arranged to switch each of the plurality of electrical signals towards a respective electrical-to-optical converter of the plurality of electrical-to-optical converters;
each of the plurality of electrical-to-optical converters is arranged to convert a respective electrical signal of the plurality of electrical signals into a corresponding optical signal, to generate a plurality of optical signals;
each of the optical network interfaces is arranged to receive a respective optical signal of the plurality of optical signals, and to transmit that optical signal towards an external client device;
an interface selected from among the electrical network interfaces and the optical network interfaces is provided by a configurable port including a first circuit configured to provide an electrical network interface and a second circuit configured to provide an optical network interface; and
one from among the first circuit and the second circuit is usable, and the other one from among the first circuit and the second circuit is not usable.
10. A leaf switch module according to claim 9 , including non-configurable ports, and configurable ports, wherein:
the optical network interfaces are provided by a combination of non-configurable ports and configurable ports; and
the electrical network interfaces are provided by configurable ports.
11. A leaf switch module according to claim 9 , wherein the optical network interfaces, the electrical-to-optical converters, the packet processor and the electrical network interfaces are all part of the same integrated package.
12. A leaf switch module according to claim 9 , wherein the packet processor includes:
a plurality of upward-facing inputs, each configured to receive a respective electrical signal of the plurality of electrical signals;
a switching component; and
a plurality of downward-facing outputs,
wherein, once an electrical signal is received by a respective one of the upward-facing inputs of the packet processor, the switching component is configured to perform downward switching, in which that electrical signal is switched to a respective one of the plurality of downward-facing outputs, based on information contained in the electrical signal.
13. A leaf switch module according to claim 9 , wherein:
the packet processor is in the form of an electronic integrated circuit,
the electrical-to-optical converters are in the form of modulators which are located on one or more photonics chips, the photonics chips being coupled to the electronic integrated circuit, and
the one or more photonics chips and the electronic integrated circuit are integrated into a single module.
14. A leaf switch module for use in an optoelectronic switch having:
a plurality of optical network interfaces;
a plurality of optical-to-electrical converters;
a first packet processor;
a plurality of electrical network interfaces;
a second packet processor; and
a plurality of electrical-to-optical converters,
wherein:
the plurality of optical network interfaces is arranged to receive a first plurality of optical signals, each optical signal of the first plurality of optical signals received from an external client device;
each optical-to-electrical converter in the plurality of optical-to-electrical converters is arranged to convert a respective optical signal of the first plurality of optical signals into a corresponding electrical signal, to generate a first plurality of electrical signals;
the first packet processor is arranged to switch each of the first plurality of electrical signals towards a respective electrical port of the plurality of electrical network interfaces, each of the electrical network interfaces arranged to transmit a respective electrical signal of the first plurality of electrical signals to an electrical fabric, and
wherein:
the plurality of electrical network interfaces is arranged to receive a respective electrical signal of a second plurality of electrical signals from the electrical fabric;
the second packet processor is arranged to switch each of the second plurality of electrical signals towards a respective electrical-to-optical converter of the plurality of electrical-to-optical converters;
each of the plurality of electrical-to-optical converters is arranged to convert a respective electrical signal of the second plurality of electrical signals into a corresponding optical signal, to generate a second plurality of optical signals; and
each of the optical network interfaces is arranged to receive a respective optical signal from the second plurality of optical signals, and to transmit that optical signal to the external client device,
wherein an interface selected from among the electrical network interfaces and the optical network interfaces is provided by a configurable port including a first circuit configured to provide an electrical network interface and a second circuit configured to provide an optical network interface, and
wherein the configurable port is configured to have the first circuit selected to provide the electrical network interface or to have the second circuit selected to provide the optical network interface.
15. A leaf switch module according to claim 14 , wherein the optical network interfaces, the optical-to-electrical converters, the first packet processor, the electrical network interfaces, the second packet processor and the electrical-to-optical converters are part of the same package.
16. A leaf switch module according to claim 14 , wherein the optical-to-electrical converters and the electrical-to-optical converters are located on the same photonics chip.
17. A leaf switch module according to claim 14 , wherein the first packet processor and the second packet processor are separate components, respectively in the form of, or located on a first electronic integrated circuit and a second electronic integrated circuit.
18. A leaf switch module according to claim 14 , wherein the first packet processor and the second packet processor are the same, single packet processor.
19. A leaf switch module according to claim 18 where the packet processor includes upward-facing inputs, upward-facing outputs, downward-facing inputs and downward-facing outputs.
20. A leaf switch module according to claim 19 , wherein the downward-facing inputs and the downward-facing outputs are located together in pairs, referred to as client-side IOs of the packet processor.
21. A leaf switch module according to claim 19 , wherein the upward-facing outputs, and the upward-facing inputs are located together in pairs, referred to as fabric-side IOs of the packet processor.
22. A leaf switch module according to claim 18 , wherein the packet processor includes a first switching component for switching an electrical signal of the first plurality of electrical signals in an upward direction, and a second switching component for switching an electrical signal of the second plurality of electrical signals in a downward direction.
23. A leaf switch module according to claim 18 , wherein the packet processor includes a single switching component arranged to:
switch an electrical signal of the first plurality of electrical signals in an upward direction; and
switch an electrical signal of the second plurality of electrical signals in a downward direction.
24. A leaf switch module according to claim 14 , wherein the optical network interfaces may be in the form of optical IOs, each including an optical input channel and an optical output channel.
25. A leaf switch module according to claim 14 , wherein the electrical network interfaces are in the form of electrical IOs, each including an electronical input channel and an electrical output channel.