All optical microwave photonic filter with bandpass and notch filtering shapes

We propose and demonstrate a novel microwave photonic filter. The microwave filter can obtain responses of a bandpass filter and a notch filter simultaneously. The microwave filter is realized based on a recirculating delay line loop (RDLL) and a cascaded delay interferometer (DI). At the two different output ports of DI, a bandpass filter and a notch filter are obtained respectively.