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23 March 1995 Antiresonant waveguide add/drop filter using Fabry-Perot interference at 1.5 μm
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We describe theoretically planar waveguide structures that accomplish the Fabry-Perot filtering functinality by using wavelength selective coupling between antiresonant reflecting optical waveguides (ARROW). In one of the structures studied, a thin cladding ARROW is coupled with a thick cladding ARROW. The thick cladding layer can be viewed as a Fabry- Perot interferometer operating at grazing-incidence. This Fabry-Perot cladding layer defines a comb of uniformly spaced optical frequencies for which input light is coupled over (filtered out) into the `drop' output port. Using parameters pertinent to a polymer-based configuration, we obtain a wavelength resolution of 3 nm for a free-spectral range of 29.7 nm. A second configuration, which we have studied, features dual output. Side-lobe suppression ratios fall in the range of 9-14 dB. Higher suppression ratios and finesse could be achieved by cascading many identical devices. The corresponding `add' functions can be achieved with these devices by simply reversing the propagation direction of light. These devices can be used as multi/demultiplexers or as optical filters depending on the applications. Computations in this work are for the 1500 nm communications band, but results can be translated to other communications bands.
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Vincent Delisle, Udo E. Trutschel, Michel A. Duguay, Falk L. Lederer, and Lutz Leine "Antiresonant waveguide add/drop filter using Fabry-Perot interference at 1.5 μm", Proc. SPIE 2402, Components for Wavelength Division Multiplexing, (23 March 1995);

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