A fast tunable optical filter with unique selection means, capable of being monolithically
integrated on silica or semiconductive wafers, includes a frequency routing device
(FRD) for receiving up to P input optical signals and responsively providing up
to Q outputs, where P and Q are integers greater than or equal to one, at least
one input selecting device for selectively coupling up to P optical signals to
the FRD, and at least one output selecting device for selectively inhibiting up
to Q outputs of said FRD.
