An optical switch, an optical transmission device, and an optical switch METHOD

In the optical switch corresponding to CDC function, since that achieve the number of input and output of the expansion of the optical switch is difficult, the optical switch of the present invention, output n optical signals by inputting the n optical signals a unit optical switch, one of the optical splitter and outputting the branched into k optical signals enter the optical signal, an optical selector for outputting one of the optical signals enter the m-number of light signals has City, optical splitter consists of m × n, the unit optical switch consists m × k pieces, optical selector consists n × k pieces, the optical divider of (k × (m × n) ) output is corresponds to the (n × (m × k)) inputs of the unit optical switch, the unit optical switch (n × (m × k)) pieces of output, the optical selector (m × (n × k)) number of corresponding to the input, is input to optical splitter to (n × m) pieces of optical signals, optical selector via the (m × k) number of unit optical switch Output as Luo (n × k) pieces of optical signals.