ANTIRESONANT WAVE-GUIDE ADD DROP FILTER USING FABRY-PEROT INTERFERENCE/

We describe planar waveguide structures that accomplish the Fabry-Pero t filtering functionality by using the wavelength selective coupling b etween antiresonant optical waveguides. By using different cladding la yer thicknesses wavelength selectivity is achieved despite the fact th at the coupled waveguides have equal core thicknesses, in contrast wit h filters based on conventional waveguides. For the polymer-based conf iguration investigated here a resolution of 1.2 nm was obtained with a free spectral range of 12 nm. We also describe a dual output filter w hich could drop or add two different wavelengths at once in a waveleng th division multiplexing (WDM) system.