Patent ID: 8452180

Claim:
An optical multiplexer comprising: a first acousto-optical tunable filter that receives an input multiple wavelength signal on an input port and transmits said signal to an output port, said filter being tunable to transmit a selected one of the wavelengths in the multiple wavelength signal to a drop port; a wavelength blocker having an input port connected to the output port of the acousto-optical tunable filter to receive the multiple wavelength signal, said wavelength blocker being operable to block the selected wavelength and transmit the remaining wavelengths to an output port of the wavelength blocker; and a second acousto-optical tunable filter having an input port that receives the remaining wavelengths, said filter having an add port and being tunable to add a wavelength present on the add port to the remaining wavelengths to form, on an output port, an output signal of the multiplexer.