A new type of a resonator defined by two or more mode-converting gratings in a waveguide is proposed and analyzed. It is shown that the proposed structure can exhibit narrow resonances similar to Fabry–Perot cavities but has an advantage of being a four-port device and thus is capable of serving as an add–drop filter.
© 2007 Optical Society of America
Original Manuscript: December 8, 2006
Revised Manuscript: January 29, 2007
Manuscript Accepted: February 3, 2007
Published: April 17, 2007
Jacob B. Khurgin, Marcel W. Pruessner, Todd H. Stievater, and William S. Rabinovich, "Add-drop filters based on mode-conversion cavities," Opt. Lett. 32, 1253-1255 (2007)