An arrangement includes a photonic band gap assembly comprising at least one input wave guide and at least one output wave guides, and at least one routing element responsive to signals to selectively route {HEAD ~ a signal} from {TAIL ~ the input wave guide} to one or more of the output wave guides 
An arrangement includes a photonic band gap assembly comprising at least one input wave guide and at least one output wave guides , and at least one routing element responsive to signals to selectively route { HEAD ~ a signal } from { TAIL ~ the input wave guide } to one or more of the output wave guides
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