, when the first optical switch (OSW) 000_0 on the input side of the first channel and the optical switch (OSW) 000_0 on the output side of the first channel are in the on state, and the second optical switch (OSW) 000_0 of the first channel is in the off state, the optical packet inputted from the input port 000 of the first channel is outputted from the output port 000 of the first channel. 