| 摘要 |
PURPOSE:To prevent the generation of a pattern effect in an optical output even on modulation at high speed by connecting one terminal of a laser-diode driving circuit to an output terminal to a distributed constant circuit grounded through a terminal resistor. CONSTITUTION:A distributed constant line (a coaxial line) in length (l) for compensating pattern effect is represented by 8 and a terminal resistor R in the line 8 by 9. A laser-diode driving circuit 11 is mounted, and the length of the distributed constant line 8 and the value of the terminal resistor R9 are adjusted thus regulating the retardation time of reflected waves and amplitude thereof at proper values, then changing optical output waveforms into waveforms having no pattern effect. Accordingly,the laser-diode driving circuit in which the pattern effect is not generated in optical outputs even in modulation at high speed can be manufactured. |
