| 摘要 |
PURPOSE:To reduce the occurrence of erroneous information discrimination in optical communication to improve the quality of communication by generating an optical output having the same pulse rise waveform independently of a bit preceding current pulse application of a current bit. CONSTITUTION:One pulse waveform generating circuit 31 receives the clock signal from a clock signal generator 2 and outputs a pulse waveform sequence of 50% duty. The other pulse waveform generating circuit 32 receives the clock signal from the clock signal generator 2 and outputs a pulse waveform sequence of 60% duty. The output of a switching circuit 4 is applied to one input terminal of an AND gate 6, and the output of the AND logic between this output and transmission NRZ data applied to the other input terminal of the AND gate 6 is applied to the gate of a laser diode driving transistor 7 to turn on or off the current flowed to a laser diode 8. Thus, a laser diode driving current waveform having the same pulse rise timing is obtained independently of data of the preceding bit. |
