Compact and fault-tolerant photonic crystal add-drop filter.
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.
Olivier
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Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, 91128 Palaiseau, France.
Weisbuch
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Benisty
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