Abstract
The fabrication and characterization are reported of a Fano resonance-based electro-optically tunable ring resonator-coupled Mach–Zehnder interferometer device based on a chalcogenide–lithium niobate hybrid waveguide system. The experiments reveal inherent asymmetric lineshapes that can be flipped to a near symmetrical resonance by applying a dc voltage of ~10 V across the electrode at the MZI non-resonator arm. Further increase in voltage yields the reverse of initial asymmetry. The optical filter-based transfer-matrix model easily explains the experimental data and indicates ways to further enhance the usability of such architecture.
Acknowledgement
The author acknowledges Dr. Christi K. Madsen and the Photonic Signal Processing research group at Texas A&M University for fruitful discussions, and help in characterization of the device.