Patent ID: 7912329

Claim:
A method of controlling an optical-signal switching apparatus that switches optical signals of a plurality of channels forming a light transmission path to other arbitrary channels, the method comprising: detecting light receiving levels of optical signals output from each output port of the optical switch; calculating deflection control amounts for changing angles of tilt mirrors of a first mirror array and a second mirror array based on default optical offsets and structure parameters of the tilt mirrors; supplying the deflection control amounts calculated to a first deflecting unit of the first mirror array and a second deflecting unit of the second mirror array to change the angles of the tilt mirrors; and changing the deflection control amounts based on the deflection control amounts calculated and the light receiving level detected to obtain an optimal point at which the light receiving level is maximum, wherein the changing includes scanning the input ports and the output ports corresponding to all the channels of the optical switch sequentially, and to obtain the optimal point with respect to all the input ports and the output ports.