Optical switch and method for controlling optical path thereof

A method for controlling optical paths of an optical switch, comprising:

• a step S1 of dividing input light into two branches and supplying the input light of one divided branch to input ports of an optical matrix switch;
• a step S2 of demultiplexing the input light of the other divided branch into the light of individual wavelengths and outputting the demultiplexed optical signals;
• a step S3 of subjecting the demultiplexed optical signals to photoelectric conversion and generating electric signals corresponding to individual wavelengths;
• a step S4 of receiving the electric signals and transmitting connection request signals which are set beforehand for individual wavelengths;
• a step S5 of receiving the connection request signals and supplying the corresponding input port information to the optical matrix switch;
• and
• a step S6 of optically connecting input ports to intended output ports in the optical matrix switch on the basis of the input port information and allowing the input light to permeate.