In order from the entry port to be output when the lightwave signal incidence to be done

摘要

PROBLEM TO BE SOLVED: To provide a technology for stably controlling a movable mirror used in a light switch with high accuracy by suppressing the influence of power supply noise or the like, even when switching the light paths in a condition with a predetermined amount of attenuation given.;SOLUTION: The controller is provided with a plurality of driving circuits 10, corresponding to a plurality of MEMS mirrors of the light switch and a controlling amount calculating part 20, which calculates the controlling amount according to the setting of the light paths. The respective drive circuits 10 have: drive signal generating parts 11X and 11Y which generate the drive signal, according to the controlling amount transmitted from the controlling amount calculating part 20; a drive voltage monitor parts 12X and 12Y which monitor the driving signal; difference detecting parts 13X and 13Y, which detect the difference of monitored voltage and the controlling amount; difference correcting parts 14X and 14Y, which correct the controlling amount on the basis of the difference; noise detecting parts 15X and 15Y which detect the noise components contained in the drive signal; and noise correcting parts 16X and 16Y which correct the control amount, on the basis of the noise components.;COPYRIGHT: (C)2007,JPO&INPIT