An optical parallel array logic system—OPALS—is a new type of optical parallel digital computing system. The OPALS optically implements array logic in parallel using techniques of image coding and 2-D correlation for the coded image with a pointwise function called an operation kernel. The OPALS can execute any logical neighborhood operation for binary images in parallel. In this paper we present a new version of the OPALS that needs no memory elements. To construct this OPALS, we consider two useful techniques, i.e., an optical sequential logic technique and multiplex correlation based on wavelength multiplexing. Use of pipelined processing together with the wavelength multiplexing technique gives the promise of eliminating memory devices from the system. Consequently, the new version of the OPALS can be systematized with simpler architecture compared with that of the OPALS presented in the previous paper. Computer simulation verifies the appropriateness of operations of the new version of the OPALS.
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