Patent ID: 8744262

Claim:
A system that can route client signals among a plurality of nodes interconnected by one or more fiber optic cables to form an optical network, the system comprising: (a) a subchannel mapper that can map each of a plurality of client signals to any available subchannel of any ITU channel, wherein each ITU channel has a predefined ITU frequency and a corresponding plurality of subchannels, and wherein each subchannel has an associated frequency with a predetermined offset from the predefined ITU frequency of the subchannel's corresponding ITU channel; (b) a first network route that designates the origin of a first client signal at a first node, and a destination for the first client signal at a second node; and (c) a tunable laser at the first node that can be set to a first subchannel frequency for which the second node has a filter to receive signals transmitted at that subchannel frequency, (d) whereby the system can route the client signal from the first node to the second node by tuning the laser to the first subchannel frequency and mapping the client signal to the subchannel associated with that subchannel frequency; and (e) further comprising a software-controlled routing table that: (i) assigns client signals to requested output ports at a desired destination node of the optical network; (ii) assigns available subchannel frequencies to client signals based on the requested output port; (iii) resolves potential conflicts in the assignment of client signals to output ports and available subchannel frequencies; and (iv) communicates assignments of client signals, output ports and subchannel frequencies among the nodes of the optical network.