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All-optical switching using nonlinear subwavelength Mach-Zehnder on silicon

Glesk, Ivan and Bock, Przemek and Cheben, Pavel and Schmid, Jens and Lapointe, Jean and Janz, Siegfried (2011) All-optical switching using nonlinear subwavelength Mach-Zehnder on silicon. Optics Express, 19 (15). pp. 14031-14039. ISSN 1094-4087

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We report on the experimental demonstration of ultrafast all-optical switching and wavelength down-conversion based on a novel nonlinear Mach-Zehnder interferometer with subwavelength grating and wire waveguides. Unlike other periodic waveguides such as line-defects in a 2D photonic crystal lattice, a subwavelength grating waveguide confines the light as a conventional index-guided structure and does not exhibit optically resonant behaviour. Since the device had no dedicated port to input optical signal to control switching a new approach was also implemented for all-optical switching control.