Short Photonic-Crystal Directional Coupling Optical Switch of Extended Optical Bandwidth Using Flat Dispersion

概要

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A directional coupling optical switch is constructed from a photonic crystal having a wide optical bandwidth. It has flat dispersion, which allows considerable shortening of its length. The switching operation of a directional coupler having flat dispersion and of an ordinary directional coupler are compared, to prove that the device length can be as short as 4.68 μm (50 times shorter than the conventional one), while maintaining the input energy and bandwidth. A 1.17 μm optical switch is fabricated, simultaneously shortening the device and extending the optical bandwidth.
2011-03-25