In this paper, we propose a novel polarization beam splitter (PBS) based on a 3-waveguide directional coupler (DC) with a Si3N4-loaded horizonal slot waveguide as the bridge. The performance of the ...

We demonstrate two kinds of low-loss 1 × 4 optical power splitters based on multimode interference (MMI) couplers. By using the adjoint shape optimization method, the shapes of MMI couples are ...