Thermo-Optically Controlled Vertical Waveguide Directional Couplers for Mode-Selective Switching
We propose a three-dimensional waveguide structure for the realization of mode-selective switches, where the high-order spatial modes of a few-mode waveguide can be q60 headers switched to various single-mode waveguides with thermo-optically controlled vertical asymmetrical directional couplers.To demonstrate the idea, we design and fabricate two s