Two-dimensional Walsh transforming device using an integrated optical circuit

Various kinds of Walsh transforming devices have been proposed or produced. One is based on the fast Walsh transform algorithm. The device, however, requires many wiring lines and adder circuits that add to its size. In this paper, we will show how to replace both the wiring line and adder circuit with one crossing point of two optical fibers, and how to fabricate the Walsh transforming device into an integrated optical circuit (IOC). A light signal is injected into the input terminals. The addition on the way is performed by light, and the electronic signal originates from the output terminals. The subtraction is carried out in the last stage. This device is simple, small and firm, and could be used for an on-line Walsh transforming. The problems in production also are discussed.