Patent ID: 8179593

Claim:
An optical-switch drive circuit comprising: a driver circuit that generates an on/off signal for driving a semiconductor optical amplifier gate switch in response to a control signal and can output the on/off signal with a high-current operation; and an operational amplifier that has a high input impedance than an input impedance of the semiconductor optical amplifier gate switch for receiving the on/off signal output from the driver circuit, is electronically coupled between an output terminal outputting the on/off signal and the semiconductor optical amplifier gate switch and provides the on/off signal with semiconductor optical amplifier gate switch by a high-current operation, and the operational amplifier includes a high-resistance voltage divider that is coupled with the output terminal, and wherein the high-resistance voltage divider has an inductor and a resistor of a lower-potential side, the inductor being serially coupled with the resistor of the lower-potential side.