Abstract

We propose and experimentally demonstrate two types of infinite impulse response (IIR) microwave photonic filters (MPFs) with different configurations, named cascaded configuration and parallel configuration. Both configurations are based on the homogeneous multicore fiber (MCF) in which the intercore power coupling is enabled by the tapering technique. The quality factors (Q factors) of cascaded and parallel IIR-MPFs are 143 and 136, respectively, which is much higher than that of one single IIR filter. The geometric structure of the tapered MCF and the number of spatial cores open new dimensions to manipulate the performance of MPFs. Theoretically, higher Q factor and rejection ratio can be obtained by using more cores of MCF to build more cascaded or parallel filters. These two types of IIR-MPFs show good reconfigurability and tunability by adjusting optical power and time delay through simulations. We anticipate that microwave photonics systems will benefit from these two types of IIR-MPFs in terms of compactness, reconfigurability, tunability, and performance stability.

© 2018 IEEE

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