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We propose and simulate a third-order 3D electro-optically highly tunable compact add-drop flter based on nonlinear microring
resonators. Te used tuning mechanism relies on enhanced Kerr nonlinearity in a graphene layer integrated on top of a two-
photonabsorption-free and low loss silicon-rich nitride core material at telecommunication wavelengths. An ultrahigh tuning
efciency (150 pm/V) over a tuning range of 1.3 nm, ensuring ultralow voltage consumption, was achieved in this work. We used
titanium oxide and silicon oxide as the upper-cladding and under-cladding materials, respectively, around the silicon-rich nitride
core material, to come up with a polarization-insensitive, and the thermally resilient third-orderadd-drop optical flter in the L
band (1565 nm–1625 nm) with a full wave at a half maximum bandwidth of 50 GHz (linewidth of 0.4 nm) around 1570 nm, a high-
free spectral range of 18.5 nm, a quality factor of 2580, an extinction ratio of 60 dB, a fnesse of 19, and a thermal stability of 0.3 pm/
K. A three-dimensional multiphysics approach was used to simulate the propagation of transverse electric and transverse
magnetic polarized waves through the flter, combining the electromagnetic features with thermo-optic and stress-optical efects.
Te contribution of this work to the existing literature is that the designed flter proposes a new and highly tunable material system
compatible with the complementary metal-oxide-semiconductor fabrication technology while combining high tunability, po-
larization insensitivity, and high thermal stability features for an ultracompact and energy-efcienton-chip integrated photonic
tunable flter for dense wavelength division multiplexing systems in the less occupied L band |
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