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A High-speed Optical Bus and Its Design

One of the problems in the construction of a large-scale multiprocessor system is that a long time is required for the data exchange among such system elements as the processor unit and the memory unit, which degrades the efficiency of the whole system. If the data exchange in such a system is performed by electrical wiring, a limit is imposed on the transmission speed and the reliability. From such a viewpoint, we proposed an optical data exchange system suited to high-speed large-capacity communication. The broadcasting optical bus using the cylindrical mirror was developed, and its feasibility was demonstrated by the recently constructed experimental pilot model. This paper presents the design method for the broadcasting optical bus based on the cylindrical mirror and the optical transmitter receivers. Expressions are derived for the optical power distribution on the transmitter receivers and the efficiency of the optical bus. The actual design is shown by an example.