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Halir, R; Maese-Novo, A; Ortega-Moñux, A; Molina-Fernández, I; Wangüemert-Pérez, J G; Cheben, P; Xu, D-X; Schmid, J H; Janz, S
Optics express, 2012-Jun-04, 2012-06-04, 20120604, Letnik: 20, Številka: 12Journal Article
Directional couplers are extensively used devices in integrated optics, but suffer from limited operational wavelength range. Here we use, for the first time, the dispersive properties of sub-wavelength gratings to achieve a fivefold enhancement in the operation bandwidth of a silicon-on-insulator directional coupler. This approach does not compromise the size or the phase response of the device. The sub-wavelength grating based directional coupler we propose covers a 100 nm bandwidth with an imbalance of ≤ 0.6 dB between its outputs, as supported by full 3D FDTD simulations.
