Multitap microwave photonic filter with positive and negative coefficients using an unbalanced Mach–Zehnder modulator

Abstract. An approach for the implementation of microwave photonic filter with positive and negative coefficients using an unbalanced Mach–Zehnder modulator (MZM) is proposed and demonstrated. In the proposed filter, a microwave signal to be filtered is applied to the unbalanced MZM via the radio frequency port. Thanks to the unbalance between the two arms of the modulator, a π-phase shift is obtained by adjusting the wavelength spacing between the adjacent wavelengths, which leads to the generation of the positive and the negative coefficients. An equivalent experiment is performed to verify our approach. A four-tap and a six-tap microwave photonic filter with positive and negative coefficients are experimentally demonstrated. The tunability and the reconfigurability of the microwave photonic filter are also investigated.

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