| 摘要 |
PURPOSE:To increase a S/N ratio by eliminating a waste of received energy, by equipping a light communication unit with a pulse-width limiting circuit which limits pulses to a width needed to operate a receiving FF provided to the reception side. CONSTITUTION:In the light communication unit, photo signals generated by driver circuits 1 and 2 and light emitting elements 3 and 4 are combined by optical fibers 5 and 6, and the photo signals are transmitted through optical fibers 5 and 6 to receiving elements 7 and 8 at the reception side, whose outputs are sent out via level converter circuits 11 and 12. At the transmission side, pulse-width limiting circuit 41 is provided which limits pulses to a width needed to operate FF42 receives the outputs of level converter circuits 11 and 12 at the reception side. This limiting circuit 41 is provided between the 1st and 2nd gate input terminals (a) to (d) for data and clocks, and driver circuits 1 and 2 at the transmission side so as to avoid a waste of received energy, thereby increasing the S/N ratio. |
