Abstract

We report a Fano resonance-based electrically reconfigurable add–drop filter using a microring resonator-coupled Mach–Zehnder interferometer (MZI) on a silicon substrate. Our experiments reveal a pair of complementary Fano resonance line shapes that can be electrically tuned and output coupled from the MZI output ports. A near symmetrical resonance peak can be flipped to a near symmetrical resonance dip by applying a forward-bias voltage of less than $1\mathrm{V}$ across a laterally integrated $\mathrm{p}\text{-}\mathrm{i}\text{-}\mathrm{n}$ diode in the MZI non-resonator-coupled arm. Our scattering-matrix-based modeling shows good agreement with the experiments and indicates ways to enhance the resonance routing functionality. Our work demonstrates the feasibility of an integrated reconfigurable add–drop filter with actively interchangeable throughput and drop ports.

© 2007 Optical Society of America

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