Propagation of fundamental mode in regularly bending multi-mode waveguides

Transmission of the fundamental mode in multi-mode waveguides is an effective scheme for a silicon-based platform to reduce scattering loss. However, application usually limited straight and restricted bending waveguides. This because waveguide seriously disordered after passing bend. In this work, we have presented “matched radius” approach, by which ultra-low loss negligible modal disorder been demonstrated Si Si3N4 The estimated TE0 transmission factor almost 0 dB at matched radius, indicating that can be re-generated waveguide. proposed approach will contribute applying low large-scale photonic integrated circuits.