Microwave photonic notch filter with a flat passband and large free spectral range frequency response

A new multiple-tap microwave photonic signal processing structure that can realize a flat passband and large free spectral range notch filter response is presented.

It is based on a polarization modulator followed by a length of polarization maintaining fiber and an unbalanced Mach-Zehnder interferometer. Experimental results are presented that verify the new concept.

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