Various embodiments of the present invention are directed to arrangements of multiple optical buses to create scalable optical interconnect fabrics for computer systems. In one aspect, a multi-bus fabric (102) for transmitting optical signals between a plurality of nodes (108-111) comprises a plurality of optical buses (104-107). Each optical bus is optically coupled to each node of the plurality of nodes, and each optical bus is configured to so that one node broadcasts optical signals generated by the node to the other nodes of the plurality of nodes.