A new single-fiber bidirectional wavelength-division-multiplexing transmission system is proposed, which employs LEDs with the same wavelength. The feasibility of this system has been confirmed by a transmission experiment.

A 1 Mbit/s optical data bus employing micro-optic directional couplers, which can compatibly replace an electrical bus cable in an in-line work station computer system connecting a central processor and four work stations up to 1.5 km apart, has been developed, and the feasibility has been confirmed.