Patent ID: 8315522

Claim:
A wavelength routing system comprising: a plurality of nodes; and an array waveguide grating having a routing property and optically connected to the plurality of nodes, wherein: each of the nodes has a plurality of light sources outputting lights at different wavelengths to the array waveguide grating, respectively; and a wavelength demultiplexer having a periodic property, demultiplexing a light output from the array waveguide grating, and outputting the demultiplexed lights, the plurality of light sources includes a tunable wavelength light source, the wavelength demultiplexer is set a value as a channel period which is different from that of the array waveguide grating, and which is more than or equal to a number of output ports of the wavelength demultiplexer, and the channel period of the wavelength demultiplexer and the channel period of the array waveguide grating are set to be relatively prime.