Improved optical switching extinction in three-electrode Ti:LiNbO3 directional couplers

Choquette, K. D.; McCaughan, L.; Smith, Wiley K.
December 1987
Applied Physics Letters;12/21/1987, Vol. 51 Issue 25, p2097
Academic Journal
Utilizing three electrodes and three independent voltages in Ti:LiNbO3 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.


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