In current chip design, the large number of interconnections and high density between components lead to signal propagation delays and communication barriers. These difficulties can be overcome by using the parallelism and non-interference characteristics of optics. The main units that make up digital circuits are logic gates and memory devices. Ichioka and Tanida proposed using projection technology to make optical logic gates. Ojima et al. used laser diodes to make optical \"NOR\" gates. Okunura made optical \"AND\" gate converters and trigger circuits.
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