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Compact and fault-tolerant photonic crystal add drop filter

Abstract : We propose an add-drop filter consisting of two adjacent waveguides carved into a two-dimensional photonic crystal that is etched through a standard guiding structure. This filter is based on distributed energy transfer via the frequency-selective intermediate conversion of the fundamental guided mode to a high-order low-group-velocity mode. This geometry circumvents the fabrication sensitivity on the single-hole scale of previous cavity-based designs. Combining distributed energy transfer and reduced group velocity preserves compactness. The design is analytically optimized with a coupled-mode approach.
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Ségolène Olivier, Claude Weisbuch, Henri Benisty. Compact and fault-tolerant photonic crystal add drop filter. Optics Letters, Optical Society of America, 2003, 28 (22), pp.2246-2248. ⟨10.1364/OL.28.002246⟩. ⟨hal-00878523⟩

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