Ultra-fast all-optical integrated differentiators in Bragg gratings

Rutkowska, K.A. and Duchesne, D. and Strain, M.J. and Morandotti, R. and Sorel, M. and Azaña, J.; (2010) Ultra-fast all-optical integrated differentiators in Bragg gratings. In: 2010 Photonics Global Conference, PGC 2010. IEEE. ISBN 9781424498826 (https://doi.org/10.1109/PGC.2010.5705928)

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In this work we present the design and first experimental demonstration of integrated-waveguide, ultra-fast all-optical differentiator based on π-phase-shifted Bragg gratings. Such a photonic device was achieved in deeply-side-etched Silicon-on-Insulator (SOI) ridged waveguides. High coupling coefficient, up to 1.15*10m, achieved in fabricated set of devices, allows for the wide operational bandwidth, resulting in terahertz-processing speeds, experimentally obtained on sub-millimetres length scales. Moreover, using our device, we have managed to generate sub-picosecond Hermite-Gaussian pulse waveforms. The proposed optical element, allowing for complete operations to be performed on a single chip, is a subject for many potential applications in ultra-fast data processing and analysis, giving inter alia a possibility for analog solving of differential equations. It can be also used in optical ultra-fast coding, sensing, pulse shaping and communications.