With the introduction of co-packaged optics (CPO)-based hosts, systems can be designed in a manner that is more flexible than conventional systems. It is possible to view the CPO as an electro-optical matrix rather than a battery of pluggable modules as with conventional hosts. Such an approach provides the opportunity to design CPO-based switches for flexibility, protection, and resilience up to 102.4 Terabits or beyond. Pluggable solutions, in addition to being more expensive, may not have such capabilities. Leveraging such opportunities, this proposal provides new techniques for defining the connectivity between CPO hosts in a manner that allows for maximum Ethernet flexibility in terms of delay, skew, and electrical/optical Physical Medium Dependent (PMD) sublayers that are available on a CPO circuit. Aspects of the presented techniques support a fully-flexible CPO host where, for example, the link rate will not be limited to the 'nominal' Institute of Electrical and Electronics Engineers (IEEE) rates (e.g., 100, 200, 400, 800, etc.) but rather may assume any value (e.g., 325, 515, 865, etc.) that can also include the aggregation of the IEEE 'nominal’ rates (e.g., 300, 500, 700, etc.).
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Mazzini, Marco and Cervasio, Alberto, "CO-PACKAGED OPTICS MAXIMUM RATE ALLOCATION ALGORITHM", Technical Disclosure Commons, (January 27, 2022)