Technologies for optical communication in rack clusters

A system comprising:

• a network switch comprising a plurality of optical connectors;
• a plurality of sleds, each sled of the plurality of sleds comprising a circuit board, an optical connector mounted on the circuit board, and one or more physical resources mounted on the circuit board;
• a plurality of passive optical cables, wherein each passive optical cable of the plurality of passive optical cables comprises:
• at least two optical fibers;
• a first connector at a first end of the passive optical cable connected to the optical connector of a corresponding sled of the plurality of sleds;
• and
• a second connector at a second end of the passive optical cable connected to an optical connector of the plurality of optical connectors of the network switch.