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23 March 1995 Antiresonant waveguide add/drop filter using Fabry-Perot interference at 1.5 μm
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Abstract
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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); https://doi.org/10.1117/12.205269
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