Microprism for Wide-Angle Low-Loss Y-Junction Waveguide

A wide-angle low-loss Y-branch waveguide with butterfly-shaped microprisms is designed. The microprisms not only compensate the phase difference but enhance the mode-conversion evolution in the branching region. Simulation results predict that a mode separation with low branching losses can be achieved in the wide-angle Y-branch. The transmitted power efficiency can be as high as 89 % for the branching angle up to 20 .