Utilizing three electrodes and three independent voltages in Ti:LiNbO 3 directional coupler optical switches, we have achieved significant improvements in switching extinction over the standard uniform Δβ configuration. The reductions in optical crosstalk vary from 3 to 24 dB for both switching states of several fabricated devices. We have observed a bar state extinction of -47.8 dB, which is the largest extinction ratio reported to date. We find that switching measurements are limited by the largest contrast ratio which can be obtained in the optical waveguides.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)