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A Novel Digitally Tunable Microwave-Photonic Notch Filter Using Differential Group-Delay Module


We demonstrate a digitally tunable microwave-photonic notch filter based on a differential group-delay module which produces a relative delay between two orthogonal polarizations. A maximum rejection level greater than 60 dB is obtained. The tenability of the filter is achieved through real-time electronic control of the relative delay time.

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