Patent ID: 7368700

Claim:
An optical switch apparatus designed to output frame signal light from a plurality of input ports to one of a plurality of output ports in a switching fashion, comprising: a switch module for deflecting frame signal light from each of input terminals associated with said input ports through the use of supply of a drive voltage to output said frame signal light to one of output terminals associated with said plurality of output ports in a switching fashion; a plurality of first branching units interposed between said input ports and said input terminals for carrying out a branch on a portion of said frame signal light from said input ports to said switch module; a plurality of first input power monitors for monitoring optical power of the branched frame signal light from each of said first branching units; a drive voltage supply control unit for controlling supply of a drive voltage to said switch module on the basis of a result of the monitor of said frame signal light from each of said first input power monitors so as to control an optical route for said frame signal light; and first delaying units each for delaying input of said frame signal light to said switch module until the drive voltage supply control on said frame signal light in said drive voltage supply control unit reaches a stable condition, with each of said first delaying units being interposed between said first branching units and said input terminals, respectively.