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.
- crystal lattice
- all-optical switching
- Mach-Zehnder interferometer
Glesk, I., Bock, P., Cheben, P., Schmid, J., Lapointe, J., & Janz, S. (2011). All-optical switching using nonlinear subwavelength Mach-Zehnder on silicon. Optics Express, 19(15), 14031-14039 . https://doi.org/10.1364/OE.19.014031