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 {HEAD ~ signals} to selectively route {TAIL ~ a signal} from the input wave guide to one or more of the output wave guides 
to selectively route
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 { HEAD ~ signals } to selectively route { TAIL ~ a signal } from the input wave guide to one or more of the output wave guides
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