Design of an interconnection network using VLSI photonics and free-space optical technologies

This paper presents the design and initial analysis of an optically interconnected multiprocessor based on the use of VCSELs (Vertical Cavity Surface Emitting Lasers) and free-space optical interconnects. The design is oriented to applications where the performance is bandwidth limited in conventional multiprocessors. The processor interconnection network is based on a physical ring topology which is logically configured as a multiring. Two alternative communications protocols are presented and the performance properties associated with a packet-based Go-Back-N protocol are discussed. Relationships between bit error rate and performance are provided.