Patent ID: 7277606

Claim:
An optical switch device, comprising: an optical system configured to deflect light signals input from a plurality of input ports thereof using a plurality of deflector parts on a channel-by-channel basis, and to output the light signals from a plurality of output ports thereof; a plurality of resistor parts provided in corresponding routes for feeding driving signals output from a plurality of drivers to the corresponding deflector parts; a signal generator part configured to generate a DC signal and an AC signal and feed the DC signal and the AC signal to the deflector parts through the corresponding drivers and the corresponding resistors; a threshold generator part configured to generate a first threshold and a second threshold corresponding to the DC signal and the AC signal, respectively, generated by the signal generator part; a voltage detector part configured to detect a voltage across each of the resistor parts; and a failure detector part configured to determine whether the deflector parts are normal or out of order based on corresponding results of comparing the voltages detected by the voltage detector part with at least one of the first threshold and the second threshold generated by the threshold voltage generator part.