The hardware for both shuffling and switching in a volume shuffle/exchange network with N channels must be duplicated log2N times to make the network full access. We discuss two space multiplexed optical feedback systems that use a single stage of optics for the shuffles and have a simplified arrangement of the bypass/exchange switches. One method interlaces channels from all stages with space invariant optics and has locally connected switches. The other method uses shift variant optics and is based on our earlier one-copy algorithm1; it divides channels at each stage into four quadrants that are interlaced so that outputs appear in distinct blocks. Experimental results will be presented.

An optoelectronic shuffle-exchange interconnection system consists of many duplicate stages of shuffle optics and electronic bypass-exchange switches. Haney1 has suggested that for "reasonable" size arrays, an optical shuffle has a great deal of unutilized space-bandwidth product (SBWP). Thus, instead of replicating the optics, we could use a single lens array to perform the shuffle for all stages of the system. We have developed a simple procedure to optimize the packing capability of a free-space perfect shuffle2 to define reasonable array sizes, and where unutilized SBWP actually exists.