| 摘要 |
PURPOSE:To keep pulse width constant by using the combinational circuit of a diode and a capacitor or the diode as the load of a collector on the side different from a collector to which a semiconductor laser is connected. CONSTITUTION:At least a semiconductor laser 1 is connected as the load of a collector for one transistor 5 constituting a current switch while at least a diode 7 is used as load in a collector for the other transistor 4 organizing the current switch. Accordingly, the VCB of the transistor 4 can be kept constant regardless of the amplitude of pulse currents, the values of currents Ia', Ib', and the reference level of VO is held constant, thus reducing the pulse current dependency of an optical output waveform. |
