Four-Channel Selective Photonic Microwave Filter Based On Optical Resonator Router

A four-channel selective microwave filter was demonstrated incorporating an optical resonator router, which is constructed by integrating a 1x4 space switch with an arrayed ring filters featuring different free spectral ranges. The center frequency of each channel was determined by the FSR of the corresponding ring resonator, and the four channels centered at 10 GHz, 16 GHz, 18 GHz and 20 GHz were individually selected to provide a bandpass filtering via the control voltage applied to the switched resonator.