Abstract
<p indent="0mm">In recent years, it has been discovered that topological photonics can ensure the robust optical behaviors of multiple optical devices, which eases the impact of defects and other perturbations on the device performance. Therefore, the combination of topological photonics and filter design is on demand. Recently, the transmission efficiency equation in a four-terminal cascaded coupled cavities system was derived based on the temporal coupled-mode theory. And general high-order nonreciprocals add/drop filter structure was designed. The simulation results are in good agreement with the theoretical prediction.
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