Optical Logic and Optically Accessed Digital Storage

A computer system can be divided according to its three principal functions: 1. The Processor Unit in which information streams interact. This is where the logic is implemented. Modern computer systems often utilize a number of processors [1]. 2. The Storage and/or Memory which acts as a repository for information. Typically this consists of a hierarchy [2] of subunits. The members of the hierarchy correspond to different trade-offs for access speed vs. capacity. Thus small amounts of information can be stored with a very rapid access capability. (There is unfortunately no universally accepted distinction between “Storage” and “Memory.” Most frequently, however, Memory refers to the faster portions of the hierarchy, where access can be highly selective, and where information is typically stored in physically distinguishable devices.) 3. The Input-Output Devices which act as transducers to the external world.

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