| 摘要 |
PURPOSE:To continuously vary a capacity, to easily compensate a light waveform, and to optimize it by controlling a voltage to be applied to a variable capacitance diode between a FET and a laser diode. CONSTITUTION:When a pulse signal is input to the gate electrode G of a FET 1, a driving pulse current responsive to the input pulse signal is obtained. When the current flows to a semiconductor laser diode 5, the diode 5 is oscillated. In this case, a series circuit of a variable resistance diode 8 and capacitors 7, 9 is connected in parallel with a resistor 4 to accelerate a driving pulse current waveform speed, thereby providing an overshoot at the first bit pulse. A control voltage Vc is altered, the capacity of the diode 8 is continuously altered, and the optical waveform pattern effect is easily and continuously compensated. |
