All-optical control of a rectangular waveguide with liquid crystal is theoretically investigated. Light propagation is established with low input power control, that excites optical nonlinearity due to optically induced reorientational effect. © 2011 IEEE. ... All optical tunable nematic liquid crystal waveguide. / Trotta, Marco; Asquini, Rita; D'Alessandro, Antonio; Beccherelli, Romeo. ... Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD. 2011. p. 29-30 6041120. ... Trotta, Marco; Asquini, Rita; D'Alessandro, Antonio; ...