Filter using vertical coupling between a single-mode waveguide and a multimode waveguide

摘要

We have demonstrated the feasibility of the process fabricating a single-mode waveguide and a multimode waveguide aligned vertically on the same substrate. Using this process, we have proposed and demonstrated a filter that drops optical signal propagating in a single-mode waveguide to a multimode waveguide in the specific wavelength interval by a long-period grating.