Picosecond optically reconfigurable filters exploiting full free spectral range tuning of single ring and Vernier effect resonators supporting data.

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We demonstrate that phase shifts larger than 2pi can be induced by all-optical tuning in silicon waveguides of a few micrometers in length. By generating high concentrations of free carriers in the silicon employing absorption of ultrashort, ultraviolet laser pulses, the refractive index of silicon can be drastically reduced. As a result, the resonance wavelength of optical resonators can be freely tuned over the full free spectral range. This allows for active integrated optic devices that can be switched ultrafastly into any desired state by all-optical means.