Non-Hermitian Silicon Nitride Microring Resonators with Large Tunable Bandwidth

We propose a non-Hermitian silicon nitride
$(\text{Si}_{3}\mathrm{N}_{4})$
microring resonators (MRRs) with a large tunable bandwidth and a large free space range (FSR) using an efficient titanium (Ti) heater. The partial Euler bend with variable-width waveguide is used to reduce the bending loss and the propagation loss of the MRR. The numerical simulation shows a wide bandwidth tuning range from 5.4 GHz to 97.3 GHz for the non-Hermitian MRRs with a FSR of 6.83 nm.